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  7. Section 107 Attainment Status Designations
  8. California.

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§ 81.305 California.

California - TSP

Designated area Does not meet primary standards Does not meet secondary standards Cannot be classified Better than national standards
North Coast Air Basin:
Del Norte County X
Humboldt County X
Mendocino County X
Sonoma County (North Coast Air Basin portion) X
Trinity County X
Lake County Air Basin X
North Central Coast Air Basin X
South Central Coast Air Basin:
San Luis Obispo County:
Salinas Valley-El Pomar Estrella Planning Area X
Non-Salinas Valley X
Santa Barbara County (AQMA portion) X
Santa Barbara County (Non-AQMA portion):
A. West area of north-south boundary separating Santa Ynez and Lompoc Valleys:
Santa Maria Area X
Outside Santa Maria Area X
B. East area of north-south boundary separating Santa Ynez and Lompoc Valleys X
Ventura County:
North of 34°23′ North Latitude X
South of 34°23′ North Latitude X
Channel Islands X
San Diego Air Basin:
San Diego County (West portion) X
San Diego County (East portion) X
South Coast Air Basin X
San Joaquin Valley Air Basin X
Sacramento Valley Air Basin (SVAB):
Sacramento County X
Solano County (SVAB Portion) X
Yolo County X
Butte County X
Colusa County X
Glenn County X
Shasta County (Sacramento Valley portion) X
Sutter County X
Tehama County X
Yuba County X
Great Basin Valleys Air Basin
Northeast Plateau Air Basin (NEPAB):
Shasta County (NEPAB portion) X
Rest of Air Basin X
Southeast Desert Air Basin:
Kern County (S.E. Desert Air Basin Portion) X
Imperial County X
Los Angeles County (S.E. Desert Air Basin Portion):
Lancaster Quartz Hill Area X
Outside Lancaster Quartz Hill Area X
Riverside County (Coachella Valley planning area) X
Riverside County (remainder of County)
San Bernardino County (S.E. Desert AQMA Portion):
Victorville Area X
Non-Victorville Area X
Riverside County (non-AQMA Portion) X
San Bernardino County (non-AQMA Portion) X
Lake Tahoe Air Basin X
San Francisco Bay Area Air Basin:
Solano County (S.F. Bay Area Air Basin portion) X
San Mateo County X
Marin County X
Napa County X
Sonoma County (S.F. Bay Area Air Basin portion) X
Alameda County X
Contra Costa County X
San Francisco County X
Santa Clara County X
Rest of Air Basin X
Mountain Counties Air Basin:
Placer County (AQMA portion) X
Placer County (excluding AQMA portion and Lake Tahoe portion) X
Amador County X
Calaveras County X
El Dorado County (excluding Lake Tahoe Air Basin portion) X
Mariposa County X
Nevada County X
Plumas County X
Sierra County X
Tuolumne County X

California - 1971 Sulfur Dioxide NAAQS

[Primary and Secondary]

Designated area Does not meet primary standards Does not meet secondary standards Cannot be classified Better than national standards
North Coast Air Basin:
Del Norte County X
Humboldt County X
Mendocino County X
Sonoma County (North Coast Basin portion) X
Trinity County X
Lake County Air Basin X
San Francisco Bay Area Air Basin X
North Central Coast Air Basin:
Monterey County X
San Benito County X
Santa Cruz County X
South Central Coast Air Basin:
San Luis Obispo County X
Santa Barbara County (AQMA portion) X
Santa Barbara County (non-AQMA portion) X
Ventura County X
Channel Islands X
San Diego Air Basin:
San Diego County (West portion) X
San Diego County (East portion) X
South Coast Air Basin:
Los Angeles County (South Coast Air Basin portion) X
Orange County X
Riverside County (South Coast Air Basin portion) X
South Coast Basin portion of San Bernardino County
San Joaquin Valley Air Basin:
Fresno County X
Kern County X
Kings County X
Madera County X
Merced County X
San Joaquin County X
Stanislaus County X
Tulare County X
Sacramento Valley Air Basin X
Great Basin Valley's Air Basin X
North East Plateau Air Basin X
Mountain Counties Air Basin X
Southeast Desert Air Basin excluding Imperial Co X
Imperial County X
Lake Tahoe Air Basin X

California - 2010 Sulfur Dioxide NAAQS

[Primary]

Designated area1 Designation
Date2 Type
Great Basin Valleys Air Basin Attainment/Unclassifiable.
Alpine County
Inyo County
Mono County
Lake County Air Basin Attainment/Unclassifiable.
Lake County
Lake Tahoe Air Basin Attainment/Unclassifiable.
El Dorado County (part)
That portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake
Placer County (part)
That portion of Placer County within the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in the vicinity of the head of the Truckee River described as follows: Commencing at the point common to the aforementioned drainage area crestline and the line common to Townships 15 North and 16 North, M.D.B. & M., and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East, M.D.B. & M., thence south along the west line of Sections 3 and 10, Township 15 North, Range 16 East, M.D.B. & M., to the intersection with the said drainage area crestline, thence following the said drainage area boundary in a southeasterly direction, then northeasterly direction to and along the Lake Tahoe Dam, thence following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning
Mojave Desert Air Basin Attainment/Unclassifiable.
Kern County (part)
That portion of Kern County east and south of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grantto the northwest corner of S. 3, T. 11 N., R. 17 W.; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S. 34, T. 32 S., R. 30 E., Mount Diablo Base and Meridian; then north to the northwest corner of S. 35, T. 31 S., R. 30 E.; then northeast along the boundary of the Rancho El Tejon Land Grantto the southwest corner of S. 18, T. 31 S., R. 31 E.; then east to the southeast corner of S. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of S. 6, T. 29 S., R. 32 E.; then east to the southwest corner of S. 31 T. 28 S., R. 32E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of S. 6, T. 28 S., R. 32 E., then west to the southeast corner of S. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary
Los Angeles County (part)
That portion of Los Angeles County which lies north and east of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the township line common to T. 3 N and T. 2 N, San Bernardino Base and Meridian; then north along the range line common to R. 8 W and R. 9 W; then west along the township line common to T. 4 N and T. 3 N; then north along the range line common to R. 12 W and R. 13 W to the southeast corner of Section 12, T. 5 N, R. 13 W; then west along the south boundaries of Sections 12, 11, 10, 9, 8, 7, T. 5 N, R. 13 W to the boundary of the Angeles National Forest which is collinear with the range line common to R. 13 W and R. 14 W; then north and west along the Angeles National Forest boundary to the point of intersection with the township line common to T. 7 N and T. 6 N (point is at the northwest corner of Section 4 in T. 6 N, R. 14 W); then west along the township line common to T. 7 N and T. 6 N; then north along the range line common to R. 15 W and R. 16 W to the southeast corner of Section 13, T. 7 N, R. 16 W; then along the south boundaries of Sections 13, 14, 15, 16, 17, 18, T. 7 N, R. 16 W; then north along the range line common to R. 16 W and R. 17 W to the north boundary of the Angeles National Forest (collinear with township line common to T. 8 N and T. 7 N) then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary
Riverside County (part)
That portion of Riverside County which lies east of a line described as follows: That segment of the southwestern boundary line of Hydrologic Unit Number 18100100 within Riverside County, further described as follows: Beginning at the Riverside-Imperial County boundary and running north along the range line common to R. 17 E. and R. 16 E., San Bernardino Base and Meridian; then northwest along the ridge line of the Chuckwalla Mountains, through T. 8 S., R. 16 E. and T. 7 S., R. 16 E., until the Black Butte Mountain, elev. 4504′; then west and northwest along the ridge line to the southwest corner of T. 5 S., R. 14 E.; then north along the range line common to R. 14 E. and R. 13 E.; then west and northwest along the ridge line to Monument Mountain, elev. 4834′; then southwest and then northwest along the ridge line of the Little San Bernardino Mountains to Quail Mountain, elev. 5814′; then northwest along the ridge line to the Riverside-San Bernardino County line
San Bernardino County (part)
That portion of San Bernardino County east and north of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to R. 3 E and R. 2 E, San Bernardino Base and Meridian; then west along the township line common to T. 3 N and T. 2 N to the San Bernardino-Los Angeles County boundary
Mountain Counties Air Basin Attainment/Unclassifiable.
Amador County
Calaveras County
El Dorado County (part)
All of El Dorado County except that portion included in the Lake Tahoe Air Basin
Mariposa County
Nevada County
Placer County (part)
All of Placer County except that portion included in the Lake Tahoe Air Basin and that portion included in the Sacramento Valley Air Basin
Plumas County
Sierra County
Tuolumne County
North Central Air Basin Attainment/Unclassifiable.
Monterey County
San Benito County
Santa Cruz County
North Coast Air Basin Attainment/Unclassifiable.
Del Norte County
Humboldt County
Mendocino County
Sonoma County (part)
That portion of Sonoma County which lies north and west of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, M.D.M.; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties, State of California
Trinity County
Northeast Plateau Air Basin Attainment/Unclassifiable.
Lassen County
Modoc County
Siskiyou County
Sacramento Valley Air Basin Attainment/Unclassifiable.
Butte County
Colusa County
Glenn County
Placer County (part)
That portion of Placer County which lies west of Range 9 east, M.D.B. & M
Sacramento County
Shasta County
Solano County (part)
That portion of Solano County which lies north and east of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34, T6N, R2W, M.D.B. & M., thence east along said 1/4 section line to the east boundary of Section 36, T6N, R2W, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T5N, R1W, thence east along a line common to T5N and T6N to the northeast corner of Section 3, T5N, R1E, thence south along section lines to the southeast corner of Section 10, T3N, R1E, thence east along section lines to the south 1/4 corner of Section 8, T3N, R2E, thence east to the boundary between Solano and Sacramento Counties
Sutter County
Tehama County
Yolo County
Yuba County
Salton Sea Air Basin Attainment/Unclassifiable.
Imperial County
Riverside County (part)
That portion of Riverside County which lies east of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to R. 4 E and R. 3 E; then east along the township line common to T. 8 S and T. 7 S; then north along the range line common to R. 5 E and R. 4 E; then west along the township line common to T. 6 S and T. 7 S to the southwest corner of Section 34, T. 6 S, R. 4 E; then north along the west boundaries of Sections 34, 27, 22, 15, 10, 3, T. 6 S, R. 4 E; then west along the township line common to T. 5 S and T. 6 S; then north along the range line common to R. 4 E and R. 3 E; then west along the south boundaries of Sections 13, 14, 15, 16, 17 and 18, T. 5 S. R. 3 E; then north along the range line common to R. 2 E and R. 3 E to the Riverside-San Bernardino County line; and west of a line described as follows: That segment of the southwestern boundary line of Hydrologic Unit Number 18100100 within Riverside County, further described as follows: Beginning at the Riverside-Imperial County boundary and running north along the range line common to R. 17 E. and R. 16 E., San Bernardino Base and Meridian; then northwest along the ridge line of the Chuckwalla Mountains, through T. 8 S., R. 16 E. and T. 7 S., R. 16 E., until the Black Butte Mountain, elev. 4504′; then west and northwest along the ridge line to the southwest corner of T. 5 S., R. 14 E.; then north along the range line common to R. 14 E. and R. 13 E.; then west and northwest along the ridge line to Monument Mountain, elev. 4834′; then southwest and then northwest along the ridge line of the Little San Bernardino Mountains to Quail Mountain, elev. 5814′; then northwest along the ridge line to the Riverside-San Bernardino County line
San Diego Air Basin Attainment/Unclassifiable.
San Diego County
San Francisco Bay Area Air Basin Attainment/Unclassifiable.
Alameda County
Contra Costa County
Marin County
Napa County
San Francisco County
San Mateo County
Santa Clara County
Solano County (part)
That portion of Solano County which lies south and west of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34, T6N, R2W, M.D.B. & M., thence east along said 1/4 section line to the east boundary of Section 36, T6N, R2W, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T5N, R1W, thence east along a line common to T5N and T6N to the northeast corner of Section 3, T5N, R1E, thence south along section lines to the southeast corner of Section 10, T3N, R1E, thence east along section lines to the south 1/4 corner of Section 8, T3N, R2E, thence east to the boundary between Solano and Sacramento Counties
Sonoma County (part)
That portion of Sonoma County which lies south and east of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, M.D.M.; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties, State of California
San Joaquin Valley Air Basin Attainment/Unclassifiable.
Fresno County
Kern County (part)
That portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of S. 3, T. 11 N., R. 17 W.; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S. 34, T. 32 S., R. 30 E., Mount Diablo Base and Meridian; then north to the northwest corner of S. 35, T. 31 S., R. 30 E.; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of S. 18, T. 31 S., R. 31 E.; then east to the southeast corner of S. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of S. 6, T. 29 S., R. 32 E.; then east to the southwest corner of S. 31, T. 28 S., R. 32 E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of S. 6, T. 28 S., R. 32 E., then west to the southeast corner of S. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary
Kings County
Madera County
Merced County
San Joaquin County
Stanislaus County
Tulare County
South Central Air Basin Attainment/Unclassifiable.
San Luis Obispo County
Santa Barbara County
Ventura County
South Coast Air Basin Attainment/Unclassifiable.
Los Angeles County (part)
That portion of Los Angeles County which lies south and west of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the township line common to T.3 N and T.2 N, San Bernardino Base and Meridian; then north along the range line common to R.8 W and R.9 W; then west along the township line common to T.4 N and T.3 N; then north along the range line common to R.12 W and R.13 W to the southeast corner of Section 12, T.5 N, R. 13 W; then west along the south boundaries of Sections 12, 11, 10, 9, 8, 7, T.5 N, R. 13 W to the boundary of the Angeles National Forest which is collinear with the range line common to R. 13 W and R. 14 W; then north and west along the Angeles National Forest boundary to the point of intersection with the township line common to T.7 N and T. 6 N (point is at the northwest corner of Section 4 in T.6 N, R. 14 W); then west along the township line common to T.7 N and T.6 N; then north along the range line common to R. 15 W and R. 16 W to the southeast corner of Section 13, T.7 N, R. 16 W; then along the south boundaries of Sections 13, 14, 15, 16, 17, 18, T.7 N, R. 16 W; then north along the range line common to R.16 W and R. 17 W to the north boundary of the Angeles National Forest (collinear with township line common to T.8 N and T.7 N); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary
Orange County
Riverside County (part)
That portion of Riverside County which lies west of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to R. 4 E and R. 3 E; then east along the township line common to T. 8 S and T. 7 S; then north along the range line common to R. 5 E and R. 4 E; then west along the township line common to T. 6 S and T. 7 S to the southwest corner of Section 34, T. 6 S, R. 4 E; then north along the west boundaries of Sections 34, 27, 22, 15, 10, 3, T. 6 S, R. 4 E; then west along the township line common to T. 5 S and T. 6 S; then north along the range line common to R. 4 E and R. 3 E; then west along the south boundaries of Sections 13, 14, 15, 16, 17 and 18, T. 5 S. R. 3 E; then north along the range line common to R. 2 E and R. 3 E to the Riverside-San Bernardino County line
San Bernardino County (part)
That portion of San Bernardino County west and south of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to R. 3 E and R. 2 E; then west along the township line common to T. 3 N and T. 2 N to the San Bernardino-Los Angeles County boundary

1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.

2 This date is April 9, 2018, unless otherwise noted.

California - Carbon Monoxide

Designated Area Designation Classification
Date1 Type Date1 Type
Bakersfield Area:
Kern County (part)
Bakersfield Metropolitan Area (Urbanized part) 6/1/98 Attainment
Chico Area:
Butte County (part)
Chico Urbanized Area (Census Bureau Urbanized part)		 6/1/98 Attainment
Fresno Area:
Fresno County (part)
Fresno Urbanized Area		 6/1/98 Attainment
Lake Tahoe North Shore Area:
Placer County (part)
That portion of Placer County within the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in the vicinity of the head of the Truckee River described as follows: commencing at the point common to the aforementioned drainage area crestline and the line common to Townships 15 North and 16 North, Mount Diablo Base, and Meridian (M.D.B. & M.), and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East, M.D.B. & M., thence south along the west line of Sections 3 and 10, Township 15 north, Range 16 East, M.D.B. & M., to the intersection with the said drainage area crestline, thence following the said drainage area boundary in a southeasterly, then northeasterly direction to and along the Lake Tahoe Dam, thence following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning		 June 1, 1998 Attainment
Lake Tahoe South Shore Area:
El Dorado County (part)
That portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake, as described under 40 CFR 81.275		 6/1/98 Attainment
Los Angeles-South Coast Air Basin Area 6/11/07 Attainment
Los Angeles County (part) - that portion of Los Angeles County which lies south and west of a line described as follows:
1. Beginning at the Los Angeles-San Bernardino County boundary and running west along the township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian;
2. Then north along the range line common to Range 8 West and Range 9 West;
3. Then west along the township line common to Township 4 North and Township 3 North;
4. Then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West;
5. Then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West;
6. Then north and west along the Angeles National Forest boundary to the point of intersection with the township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West);
7. Tthen west along the township line common to Township 7 North and Township 6 North;
8. Then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West;
9. Then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West;
10. Then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the township line common to Township 8 North and Township 7 North);
11. Then west along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant;
12. Then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
Orange County:
Riverside County (part) - that portion of Riverside County which lies to the west of a line described as follows:
1. Beginning at the Riverside - San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian;
2. Then east along the township line common to Township 8 South and Township 7 South;
3. Then north along the range line common to Range 5 East and Range 4 East;
4. Then west along the township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East;
5. Then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East;
6. Then west along the township line common to Township 5 South and Township 6 South;
7. Then north along the range line common to Range 4 East and Range 3 East;
8. Then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East;
9. Then north along the range line common to Range 2 East and Range 3 East to the Riverside-San Bernardino county line.
San Bernardino County - that portion of San Bernardino County which lies south and west of a line described as follows:
1. Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian;
2. Then west along the township line common to Township 3 North and Township 2 North to the San Bernardino - Los Angeles County boundary.
Modesto Area:
Stanislaus County (part)
Modesto Urbanized Area (Census Bureau Urbanized Area)		 6/1/98 Attainment
Sacramento Area:
Census Bureau Urbanized Area) 6/1/98 Attainment
Placer County (part)
Sacramento County (part)
Yolo County (part)
San Diego Area:
San Diego County (part)
The Western Section of Air Pollution Control District of San Diego County is defined as all that portion of San Diego County, State of California, lying westerly of the following described line:		 6/1/98 Attainment
1. Beginning at the Northwest of Township 9 South, Range 1 West, San Bernardino Base and Meridian;
2. thence running Southerly along the West line of said township to the south line therof;
3. thence Easterly along said South line to the range line between Range 1 West and Range 1 East;
4. thence Southerly along said range line to the township line between Township 11 South and 12 South;
5. thence Easterly along said township line to the range line between Range 1 East and Range 2 East;
6. thence Southerly along said range line to the international boundary between the United States of America and Mexico.
San Francisco-Oakland-San Jose Area:
Urbanized Areas 6/1/98 Attainment
Alameda County (part)
Contra Costa County (part)
Marin County (part)
Napa County (part)
San Francisco County
San Mateo County (part)
Santa Clara County (part)
Solano County (part)
Sonoma County (part)
Stockton Area:
San Joaquin County (part) 6/1/98 Attainment
Stockton Urbanized Area
Great Basin Valley Air Basin Unclassifiable/Attainment
Alpine County
Inyo County
Mono County
Lake County Air Basin
Lake County Unclassifiable/Attainment
Mountain Counties Air Basin
Amador County Unclassifiable/Attainment
Calaveras County Unclassifiable/Attainment
El Dorado County (part)
excluding Lake Tahoe South Shore Unclassifiable/Attainment
Mariposa County Unclassifiable/Attainment
Nevada County Unclassifiable/Attainment
Placer County (part)
excluding Lake Tahoe Air Basin portion and AQMA portion Unclassifiable/Attainment
AQMA portion (of Placer County) Unclassifiable/Attainment
Plumas County Unclassifiable/Attainment
Sierra County Unclassifiable/Attainment
Tuolumne County Unclassifiable/Attainment
North Central Coast Air Basin
Monterey County Unclassifiable/Attainment
San Benito County Unclassifiable/Attainment
Santa Cruz County Unclassifiable/Attainment
North Coast Air Basin Unclassifiable/Attainment
Del Norte County
Humboldt County
Mendocino County
Sonoma County (part)
Remainder of County
Trinity County
Northeast Plateau Air Basin Unclassifiable/Attainment
Lassen County
Modoc County
Siskiyou County
Sacramento Valley Air Basin (portion)
Butte County (part)
Area other than Chico Urbanized Area (Census Bureau urbanized part) Unclassifiable/Attainment
Colusa County Unclassifiable/Attainment
Glenn County Unclassifiable/Attainment
Sacramento County (part)
Area other than Census Bureau urbanized areas Unclassifiable/Attainment
Shasta County Unclassifiable/Attainment
Solano County (part)
Sacramento Valley Air Basin portion Unclassifiable/Attainment
Sutter County Unclassifiable/Attainment
Tehama County Unclassifiable/Attainment
Yolo County (part)
Area outside Census Bureau urbanized areas Unclassifiable/Attainment
Yuba County Unclassifiable/Attainment
San Diego Air Basin (Remainder of)
San Diego County (part)
Remainder of County Unclassifiable/Attainment
San Francisco Bay Area Air Basin Unclassifiable/Attainment
Area other than urbanized Areas
Alameda County (part)
Contra Costa County (part)
Marin County (part)
Napa County (part)
San Mateo County (part)
Santa Clara County (part)
Solano County (part)
Sonoma County (part)
San Joaquin Valley Air Basin
Fresno County (part)
Outside Fresno Urbanized Area Unclassifiable/Attainment
Kern County (part)
Area other than Bakersfield Metropolitan Area (Urbanized part) Unclassifiable/Attainment
Kings County Unclassifiable/Attainment
Madera County Unclassifiable/Attainment
Merced County Unclassifiable/Attainment
San Joaquin County (part)
Outside Stockton urbanized area Unclassifiable/Attainment
Stanislaus County (part)
Outside Modesto Urbanized Area (Census Bureau Urbanized Area) Unclassifiable/Attainment
Tulare County Unclassifiable/Attainment
South Central Coast Air Basin
Channel Islands Unclassifiable/Attainment
San Luis Obispo County Unclassifiable/Attainment
Santa Barbara County Unclassifiable/Attainment
Ventura County Unclassifiable/Attainment
Southeast Desert Air Basin
Imperial County Unclassifiable/Attainment
Kern County (part)
excluding San Joaquin Valley portion Unclassifiable/Attainment
Los Angeles County
excluding Los Angeles - South Coast Air Basin portion Unclassifiable/Attainment
Riverside County (part) Portion excluding Los Angeles-South Coast Air Basin Unclassifiable/Attainment.
San Bernardino Co(part)
AQMA portion (excluding Los Angeles - South Coast Air Basin) Unclassifiable/Attainment
Non-AQMA portion (excluding Los Angeles - South Coast Air Basin) Unclassifiable/Attainment

1 This date is November 15, 1990, unless otherwise noted.

California - Ozone (1-Hour Standard)4

Designated area Designation Classification
Date1 Type Date1 Type
Chico Area:
Butte County (3) Nonattainment (3) Sec. 185A Area.2
Imperial County Area:
Imperial County 11/15/90 Nonattainment 11/15/90 Sec. 185A Area.2
Los Angeles-South Coast Air Basin Area5 11/15/90 Nonattainment 11/15/90 Extreme.
Los Angeles County (part) 11/15/90 Nonattainment 11/15/90 Extreme.
That portion of Los Angeles County which lies south and west of a line described as follows:
1. Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian;
2. then north along the range line common to Range 8 West and Range 9 West;
3. then west along the Township line common to Township 4 North and Township 3 North;
4. then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West;
5. then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West;
6. then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West);
7. then west along the Township line common to Township 7 North and Township 6 North;
8. then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West;
9. then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West;
10. then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North);
11. then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant;
12. then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
Orange County 11/15/90 Nonattainment 11/15/90 Extreme.
Riverside County (part) 11/15/90 Nonattainment 11/15/90 Extreme.
That portion of Riverside County which lies to the west of a line described as follows:
1. Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian;
2. then east along the Township line common to Township 8 South and Township 7 South;
3. then north along the range line common to Range 5 East and Range 4 East;
4. then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East;
5. then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East;
6. then west along the Township line common to Township 5 South and Township 6 South;
7. then north along the range line common to Range 4 East and Range 3 East;
8. then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East;
9. then north along the range line common to Range 2 East and Range 3 East to the Riverside-San Bernardino County line.
San Bernardino County (part) 11/15/90 Nonattainment 11/15/90 Extreme.
That portion of San Bernardino County which lies south and west of a line described as follows:
1. Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian;
2. then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary.
Morongo Band of Mission Indians6 11/15/90 Nonattainment 11/15/90 Severe-17.
Monterey Bay Area Attainment
Monterey County
San Benito County
Santa Cruz County
Sacramento Metro Area 11/15/90 Nonattainment 6/01/95 Severe-15.
El Dorado County (part):
All portions of the county except that portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake.
Placer County (part):
All portions of the county except that portion of Placer County within the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in the vicinity of the head of the Truckee River described as follows: commencing at the point common to the aforementioned drainage area crestline and the line common to Townships 15 North and 16 North, Mount Diablo Base and Meridian (M.D.B. & M.), and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East, M.D.B. & M., thence south along the west line of Sections 3 and 10, Township 15 North, Range 16 East, M.D.B. & M., to the intersection with the said drainage area crestline, thence following the said drainage area boundary in a southeasterly, then northeasterly direction to and along the Lake Tahoe Dam, thence following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning. 11/15/90 Nonattainment 6/01/95 Severe-15.
Sacramento County 11/15/90 Nonattainment 6/01/95 Severe-15.
Solano County (part) That portion of Solano County which lies north and east of a line described as follows: 11/15/90 Nonattainment 6/01/95 Severe-15.
Description of boundary in Solano county between San Francisco and Sacramento: Beginning at the intersection of the westerly boundary of Solano County and the 1⁄4 section line running east and west through the center of Section 34; T. 6 N., R. 2 W., M.D.B. & M., thence east along said 1⁄4 section line to the east boundary of Section 36, T. 6 N., R. 2 W., thence south 1⁄2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T. 5 N., R. 1 W., thence east along a line common to T. 5 N. and T. 6 N. to the northeast corner of Section 3, T. 5 N., R. 1 E., thence south along section lines to the southeast corner of Section 10, T. 3 N., R. 1 E., thence east along section lines to the south 1⁄4 corner of Section 8, T. 3 N., R. 2 E., thence east to the boundary between Solano and Sacramento Counties 11/15/90 Nonattainment 6/01/95 Severe-15.
Sutter County (part - southern portion)South of a line connecting the northern border of Yolo Co. to the SW tip of Yuba Co. and continuing along the southern Yuba County border to Placer County. 11/15/90 Nonattainment 6/01/95 Severe-15.
Yolo County 11/15/90 Nonattainment 6/01/95 Severe-15.
San Diego Area:
San Diego County 7/28/03 Attainment
San Francisco-Bay Area 8/10/98 Nonattainment 8/10/98 Not classified/Moderate under 23 U.S.C.
8/23/99 104(b)(2).
Alameda County 8/10/98 ......do 8/23/99 Do.
Contra Costa County 8/10/98 ......do 8/23/99 Do.
Marin County 8/10/98 ......do 8/23/99 Do.
Napa County 8/10/98 ......do 8/23/99 Do.
San Francisco County 8/10/98 ......do 8/23/99 Do.
San Mateo County 8/10/98 ......do 8/23/99 Do.
Santa Clara County 8/10/98 ......do 8/23/99 Do.
Solano County (part) 8/10/98 ......do 8/23/99 Do.
That portion of the county that lies south and west of the line described that follows: Description of boundary in Solano County between San Francisco and Sacramento: Beginning at the intersection at the westerly boundary of Solano County and the 1⁄4 section line running east and west through the center of Section 34; T.6 N., R. 2 W., M.D.B. & M., thence east along said 1⁄2 section line to the east boundary of Section 36, T. 6 N., R. 2 W., thence south 1⁄2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T. 5 N., R. 1 W, thence east along a line common to T. 5 N., and T. 6 N. to the northeast corner of Section 3, T. 5 N., R. 1 E., thence south along section lines to the southeast corner of Section 10 T. 3 N., R. 1 E., thence east along section lines to the south 1⁄4 corner of Section 8 T. 3 N., R. 2 E., thence east to the boundary between Solano and Sacramento Counties.
Sonoma County (part) 8/10/98 ......do 8/23/99 Do.
That portion of Sonoma county which lies south and east of a line described as follows: Beginning at the south-easterly corner of the Rancho Estero Americano, being on the boundary line between Marin Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive, thence running along said boundary of Rancho Canada de Jonive westerly,; northerly and easterly to its intersection with the easterly line of Granton Road; thence running along the easterly and southerly line of Granton Road northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly and northerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road: thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Ranco Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 north, Mt. Diablo Base and Meridian; thence running easterly along said Township line to its intersection with the boundary line between Sonoma and Napa Counties, State of California.
East Kern County:
That portion of Kern County that lies east and south of a line described below: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East, then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County Boundary 6/21/04 Attainment
San Joaquin Valley Area:
Fresno County 11/15/90 Nonattainment 05/17/04 Extreme
Kern County (part). That portion of Kern County that lies west and north of a line described below: 11/15/90 Nonattainment 05/17/04 Extreme
Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Pliebre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County boundary:
Kings County 11/15/90 Nonattainment 05/17/04 Extreme
Madera County 11/15/90 Nonattainment 05/17/04 Extreme
Merced County 11/15/90 Nonattainment 05/17/04 Extreme
San Joaquin County 11/15/90 Nonattainment 05/17/04 Extreme
Stanislaus County 11/15/90 Nonattainment 05/17/04 Extreme
Tulare County 11/15/90 Nonattainment 05/17/04 Extreme
Santa Barbara-Santa Maria-Lompoc Area:
Santa Barbara County 8/8/03 Attainment
Southeast Desert Modified AQMA Area 11/15/90 Nonattainment 11/15/90 Severe-17.
Los Angeles County (part) - that portion of Los Angeles County which lies north and east of a line described as follows:
1. Beginning at the Los Angeles - San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian;
2. then north along the range line common to Range 8 West and Range 9 West;
3. then west along the Township line common to Township 4 North and Township 3 North;
4. then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West;
5. then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West;
6. then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West);
7. then west along the Township line common to Township 7 North and Township 6 North;
8. then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West;
9. then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West;
10. then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North);
11. then west along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant;
12. then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
Riverside County 11/15/90 Nonattainment 11/15/90 Severe-17
Coachella Valley planning area - that portion of Riverside County which lies to the east of a line described as follows:
1. Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian;
2. then east along the Township line common to Township 8 South and Township 7 South;
3. then north along the range line common to Range 5 East and Range 4 East;
4. then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East;
5. then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East;
6. then west along the Township line common to Township 5 South and Township 6 South;
7. then north along the range line common to Range 4 East and Range 3 East;
8. then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East;
9. then north along the range line common to Range 2 East and Range 3 East to the Riverside-San Bernardino County line and that portion of Riverside County which lies to the west of a line described as follows: That segment of the southwestern boundary line of Hydrologic Unit Number 18100100 within Riverside County, further described as follows:
10. Beginning at the Riverside-Imperial County boundary and running north along the range line common to Range 17 East and Range 16 East, San Bernardino Base and Meridian;
11. then northwest along the ridge line of the Chuckwalla Mountains, through Township 8 South, Range 16 East and Township 7 South, Range 16 East, until the Black Butte Mountain, elevation 4504 feet;
12. then west and northwest along the ridge line to the southwest corner of Township 5 South, Range 14 East;
13. then north along the range line common to Range 14 East and Range 13 East;
14. then west and northwest along the ridge line to Monument Mountain, elevation 4834 feet;
15. then southwest and then northwest along the ridge line of the Little San Bernardino Mountains to Quail Mountain, elevation 5814 feet;
16. then northwest along the ridge line to the Riverside-San Bernardino County line
San Bernadino County (part) - that portion of San Bernardino County which lies north and east of a line described as follows: 11/15/90 Nonattainment 11/15/90 Severe-17.
1. Beginning at the San Bernardino - Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian;
2. then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino - Los Angeles County boundary; and that portion of San Bernardino County which lies south and west of a line described as follows:
3. latitude 35 degrees, 10 minutes north and longitude 115 degrees, 45 minutes west.
Ventura County Area:
Ventura County 11/15/90 Nonattainment 11/15/90 Severe-15.
Yuba City Area:
Sutter County (part - northern portion) (3) Nonattainment (3) Sec. 185A Area.2.
North of a line connecting the northern border of Yolo County to the SW tip of Yuba County and continuing along the southern Yuba County border to Placer County.
Yuba County (3) Nonattainment (3) Sec. 185A Area.2.
Great Basin Valleys Air Basin Unclassifiable/Attainment
Alpine County
Inyo County
Mono County
Lake County Air Basin Unclassifiable/Attainment
Lake County
Lake Tahoe Air Basin Unclassifiable/Attainment
El Dorado County (part)
Lake Tahoe Area: As described under 40 CFR 81.275.
Placer County (part)
Lake Tahoe Area: As described under 40 CFR 81.275.
Mountain Counties Air Basin (Remainder of):
Amador County 11/15/90 Unclassifiable/Attainment 11/15/90
Calaveras County 11/15/90 Unclassifiable/Attainment 11/15/90
Mariposa County Unclassifiable/Attainment
Nevada County Unclassifiable/Attainment
Plumas County Unclassifiable/Attainment
Sierra County Unclassifiable/Attainment
Tuolumne County Unclassifiable/Attainment
North Coast Air Basin Unclassifiable/Attainment
Del Norte County
Humboldt County
Mendocino County
Sonoma County (part)
Remainder of County
Trinity County
Northeast Plateau Air Basin Unclassifiable/Attainment
Lassen County
Modoc County
Siskiyou Couny
Sacramento Valley Air Basin (Remainder of):
Colusa County Unclassifiable/Attainment
Glenn County Unclassifiable/Attainment
Shasta County Unclassifiable/Attainment
Tehama County Unclassifiable/Attainment
South Central Coast Air Basin (Remainder of):
Channel Islands Unclassifiable/Attainment
San Luis Obispo County Unclassifiable/Attainment
Southeast Desert NON-AQMA:
Riverside County (part)
Remainder of county Unclassifiable/Attainment
San Bernadino County (part)
Remainder of county Unclassifiable/Attainment

1 This date is October 18, 2000 unless otherwise noted.

2 An area designated as an ozone nonattainment area as of the date of enactment of the CAAA of the 1990 that did not violate the ozone NAAQS during the period of 1987-1989.

3 This date is January 16, 2001.

4 The 1-hour ozone standard is revoked effective June 15, 2005 for all areas in California. The Monterey Bay, San Diego, and Santa Barbara-Santa Maria-Lompoc areas are maintenance areas for the 1-hour NAAQS for purposes of 40 CFR part 51 subpart X.

5 Excludes Morongo Band of Mission Indians' Indian country in Riverside County.

6 Includes Indian country of the tribe listed in this table. Information pertaining to areas of Indian country in this table is intended for CAA planning purposes only and is not an EPA determination of Indian country status or any Indian country boundary. EPA lacks the authority to establish Indian country land status, and is making no determination of Indian country boundaries, in this table.

California - PM-10

Designated Area Designation Classification
Date Type Date Type
Inyo County
Coso Junction planning area October 4, 2010 Attainment
That portion of Inyo County contained within Hydrologic Unit #18090205
Owens Valley planning area 11/15/90 Nonattainment 02/08/93 Serious
Hydrologic Unit #18090103
Sacramento County 10/28/2013 Attainment.
San Bernardino County:
San Bernardino (part):
Excluding that portion located in the Trona planning area and excluding that portion located in the South Coast Air Basin 1/20/94 Nonattainment 1/20/94 Moderate.
Trona planning area: That portion of San Bernardino County contained within Hydrologic Unit #18090285 9/5/02 Nonattainment 9/5/02 Moderate
Mono County
Mammoth Lakes planning area 11/4/15 Attainment
Includes the following sections:
a. Sections 1-12, 17, and 18 of Township T4S, R28E;
b. Sections 25-36 of Township T3S, R28E;
c. Sections 25-36 of Township T3S, R27E;
d. Sections 1-18 of Township T4S, R27E; and,
e. Sections 25 and 36 of Township T3S, R26E.
Mono Basin
Hydrologic Unit 1809010 12/29/93 Nonattainment 12/29/93 Moderate
Fresno, Kern, Kings, Madera, Merced, San Joaquin, Stanislaus, Tulare Counties:
Indian Wells Valley planning area: That portion of Kern County contained within Hydrologic Unit #18090205 6/6/03 Attainment
San Joaquin Valley Air Basin; Fresno County, Kings County, Madera County, Merced County, San Joaquin County, Stanislaus County, Tulare County, and that portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of S. 3, T. 11 N., R. 17 W.; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S. 34, T. 32 S., R. 30 E., Mount Diablo Base and Meridian; then north to the northwest corner of S. 35, T. 31 S., R. 30 E.; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of S. 18, T. 31 S., R. 31 E.; then east to the southeast corner of S. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of S. 6, T. 29 S., R. 32 E.; then east to the southwest corner of S. 31, T. 28 S., R. 32 E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of S. 6, T. 28 S., R. 32 E., then west to the southeast corner of S. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary 12/12/08 Attainment
East Kern: That portion of Kern County which lies between the following two lines (with the exception of that portion in Hydrologic Unit Number 18090205 - the Indian Wells Valley): 11/15/90 Nonattainment 02/08/93 Serious.
(1) West and north of a line described as follows: Beginning at the southwest corner of section 31, T. 10 N 16 W and running east to the northwest boundary of the Rancho La Liebre Land Grant; then running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to R. 15 W. and R. 16 W., San Bernardino Base and Meridian; then north along the range line to the northwest corner of section 2, T. 32 S., R. 32 E., Mount Diablo Base and Meridian; then east along the township line common to T. 32 S. and T. 31 S.; then north along the range line common to R. 35 E. and R. 34 E.; then east along the township line common to T. 29 S. and T. 28 S.; then north along the range line common to R. 36 E. and R. 35 E.; then east along the township line common to T. 28 S. and T. 27 S.; then north along the range line common to R. 37 E. and R. 36 E. to the Kern-Tulare County boundary
(2) East and south of a line of a line described as follows: Beginning at the southwest corner of section 31, T. 10 N 16 W and running north along the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of S. 3, T. 11 N., R. 17 W.; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S. 34, T. 32 S., R. 30 E., Mount Diablo Base and Meridian; then north to the northwest corner of S. 35, T. 31 S., R. 30 E.; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of S. 18, T. 31 S., R. 31 E.; then east to the southeast corner of S. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of S. 6, T. 29 S., R. 32 E.; then east to the southwest corner of S. 31, T. 28 S., R. 32 E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of S. 6, T. 28 S., R. 32 E., then west to the southeast corner of S. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary
Riverside, Los Angeles, Orange, and San Bernardino Counties
South Coast Air Basin 7/26/13 Attainment
Riverside County
Coachella Valley planning area 11/15/90 Nonattainment 02/08/93 Serious.
Imperial County:
Imperial Valley planning area: That portion of Imperial County that is defined as follows: 10/19/2020 Attainment
Commencing at the southwest corner of Imperial County and extending north along the Imperial-San Diego County line to the northwest corner of Imperial County; then east along the Imperial-Riverside County line to the point of intersection of the eastern boundary line of Hydrologic Unit #18100200; then southeasterly along the eastern boundary line of Hydrologic Unit #18100200 to the Imperial County-Mexico Border; then west along the Imperial County-Mexico Border to the point of the beginning.
Rest of State 11/15/90 Unclassifiable

California - 1997 Annual PM2.5 NAAQS

[Primary and Secondary]

Designated area Designationa Classification
Date1 Type Date2 Type
Los Angeles-South Coast Air Basin, CA:
Los Angeles County (part) Nonattainment Moderate
That portion of Los Angeles County which lies south and west of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary
Orange County Nonattainment Moderate.
Riverside County (part) Nonattainment Moderate.
That portion of Riverside County which lies to the west of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line
San Bernardino County (part) Nonattainment Moderate.
That portion of San Bernardino County which lies south and west of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary
San Diego, CA:
San Diego County Unclassifiable/Attainment
San Joaquin Valley, CA:
Fresno County Nonattainment 5/7/15 Serious.
Kern County (part) Nonattainment 5/7/15 Serious.
That portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of S. 3, T. 11 N., R. 17 W.; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S. 34, T. 32 S., R. 30 E., Mount Diablo Base and Meridian; then north to the northwest corner of S. 35, T. 31 S., R. 30 E.; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of S. 18, T. 31 S., R. 31 E.; then east to the southeast corner of S. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of S. 6, T. 29 S., R. 32 E.; then east to the southwest corner of S. 31, T. 28 S., R. 32 E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of S. 6, T. 28 S., R. 32 E., then west to the southeast corner of S. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary
Kings County Nonattainment 5/7/15 Serious.
Madera County Nonattainment 5/7/15 Serious.
Merced County Nonattainment 5/7/15 Serious.
San Joaquin County Nonattainment 5/7/15 Serious.
Stanislaus County Nonattainment 5/7/15 Serious.
Tulare County Nonattainment 5/7/15 Serious.
North Coast Air Basin:
Del Norte County Unclassifiable/Attainment
Humboldt County Unclassifiable/Attainment
Mendocino County Unclassifiable/Attainment
Sonoma County (part) Unclassifiable/Attainment
That portion of Sonoma county which lies north and west of a line described as follows: Beginning at the south-easterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive, thence running along said boundary of Rancho Canada de Jonive westerly; northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly and northerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road: thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 north, Mt. Diablo Base and Meridian; thence running easterly along said Township line to its intersection with the boundary line between Sonoma and Napa Counties, State of California
Trinity County 3/7/11 Unclassifiable/Attainment
Northeast Plateau Air Basin:
Lassen County 3/7/11 Unclassifiable/Attainment
Modoc County 3/7/11 Unclassifiable/Attainment
Siskiyou County 3/7/11 Unclassifiable/Attainment
Lake County Air Basin:
Lake County Unclassifiable/Attainment
Upper Sacramento Valley Region:
Butte County (remainder) 3/7/11 Unclassifiable/Attainment
Colusa County Unclassifiable/Attainment
Glenn County Unclassifiable/Attainment
Shasta County 3/7/11 Unclassifiable/Attainment
Sutter County (part) Unclassifiable/Attainment
Tehama County 3/7/11 Unclassifiable/Attainment
Yuba County (remainder) 3/7/11 Unclassifiable/Attainment
Sacramento Metropolitan Region:
El Dorado County (part) Unclassifiable/Attainment
All portions of the county except that portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake
Placer County (part) Unclassifiable/Attainment
All portions of the county except that portion of Placer County within the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in the vicinity of the head of the Truckee River described as follows: Commencing at the point common to the aforementioned drainage area crestline and the line common to Townships 15 North and 16 North, Mount Diablo Base and Meridian, and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, thence south along the west line of Sections 3 and 10, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, to the intersection with the said drainage area crestline, thence following the said drainage area boundary in a southeasterly, then northeasterly direction to and along the Lake Tahoe Dam, thence following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning
Sacramento County Unclassifiable/Attainment
Solano County (part) Unclassifiable/Attainment
That portion of Solano County which lies north and east of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34; Township 6 North, Range 2 West, Mount Diablo Base and Meridian, thence east along said 1/4 section line to the east boundary of Section 36, Township 6 North, Range 2 West, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West, thence east along a line common to Township 5 North and Township 6 North to the northeast corner of Section 3, Township 5 North, Range 1 East, thence south along section lines to the southeast corner of Section 10, Township 3 North, Range 1 East, thence east along section lines to the south 1/4 corner of Section 8, Township 3 North, Range 2 East, thence east to the boundary between Solano and Sacramento Counties
Sutter County (part) Unclassifiable/Attainment
That portion south of a line connecting the northern border of Yolo County to the southwest tip of Yuba County and continuing along the southern Yuba County border to Placer County
Yolo County Unclassifiable/Attainment
Northern Mountain Counties:
Nevada County Unclassifiable/Attainment.
Plumas County 3/7/11 Unclassifiable/Attainment
Sierra County 3/7/11 Unclassifiable/Attainment
Central Mountain Counties:
Amador County Unclassifiable/Attainment
Calaveras County Unclassifiable/Attainment
Southern Mountain Counties:
Mariposa County Unclassifiable/Attainment
Tuolumne County Unclassifiable/Attainment
Lake Tahoe Air Basin:
El Dorado County (part) Unclassifiable/Attainment
That portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake.
Placer County (part) Unclassifiable/Attainment
That portion of Placer County within the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in the vicinity of the head of the Truckee River described as follows: commencing at the point common to the aforementioned drainage area crestline and the line common to Townships 15 North and 16 North, Mount Diablo Base and Meridian, and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, thence south along the west line of Sections 3 and 10, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, to the intersection with the said drainage area crestline, thence following the said drainage area boundary in a southeasterly, then northeasterly direction to and along the Lake Tahoe Dam, thence following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning
San Francisco Bay Area Air Basin:
Alameda County Unclassifiable/Attainment
Contra Costa County Unclassifiable/Attainment
Marin County Unclassifiable/Attainment
Napa County Unclassifiable/Attainment
San Francisco County Unclassifiable/Attainment
San Mateo County Unclassifiable/Attainment
Santa Clara County Unclassifiable/Attainment
Solano County (part) Unclassifiable/Attainment
Portion of Solano County which lies south and west of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34, T6N, R2W, M.D.B. & M., thence east along said 1/4 section line to the east boundary of Section 36, T6N, R2W, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T5N, R1W, thence east along a line common to T5N and T6N to the northeast corner of Section 3, T5N, R1E, thence south along section lines to the southeast corner of Section 10, T3N, R1E, thence east along section lines to the south 1/4 corner of Section 8, T3N, R2E, thence east to the boundary between Solano and Sacramento Counties
Sonoma County (part) Unclassifiable/Attainment.
That portion of Sonoma County which lies south and east of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, M.D.M.; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties
North Central Coast Air Basin:
Monterey County Unclassifiable/Attainment
San Benito County Unclassifiable/Attainment
Santa Cruz County Unclassifiable/Attainment
San Luis Obispo County:
San Luis Obispo County Unclassifiable/Attainment
Santa Barbara County:
Santa Barbara County (part) Unclassifiable/Attainment
Excluding San Miguel, Santa Rosa, Santa Cruz, and Santa Barbara Islands
Santa Barbara County (part) Unclassifiable/Attainment
San Miguel, Santa Rosa, Santa Cruz, and Santa Barbara Islands.
Ventura County:
Ventura County (part) Unclassifiable/Attainment
Excluding Anacapa and San Nicolas Islands.
Ventura County (part) Unclassifiable/Attainment
Anacapa and San Nicolas Islands.
Great Basin Valleys Air Basin:
Alpine County Unclassifiable/Attainment
Inyo County (part) Unclassifiable/Attainment
That portion of Inyo County that lies outside Hydrologic Unit Number 18090205.
Mono County Unclassifiable/Attainment
Coso Junction:
Inyo County (part) Unclassifiable/Attainment
That portion of Inyo County that lies inside Hydrologic Unit Number 18090205.
Eastern Kern County:
Kern County (part) Unclassifiable/Attainment
That portion of Kern County (with the exception of that portion in Hydrologic Unit Number 18090205 - the Indian Wells Valley) east and south of a line described as follows: Beginning at the Kern - Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County boundary
Indian Wells Valley:
Kern County (part) Unclassifiable/Attainment
That portion of Kern County that lies inside Hydrologic Unit Number 18090205.
Western Mojave Desert and Antelope Valley:
Los Angeles County (part) Unclassifiable/Attainment
That portion of Los Angeles County which lies north and east of a line described as follows: Beginning at the Los Angeles - San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
Trona:
San Bernardino County (part) Unclassifiable/Attainment
That portion of San Bernardino County that lies inside Hydrologic Unit Number 18090205.
Coachella Valley:
Riverside County (part) Unclassifiable/Attainment
That portion of Riverside County which lies to the east of a line described as follows: Beginning at the Riverside - San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East;, to the Riverside-San Bernardino County line: And that portion of Riverside County which lies to the west of a line described as follows: That segment of the southwestern boundary line of Hydrologic Unit Number 18100100 within Riverside County, further described as follows: Beginning at the Riverside-Imperial County boundary and running north along the range line common to Range 17 East and Range 16 East, San Bernardino Base and Meridian; then northwest along the ridge line of the Chuckwalla Mountains, through Township 8 South, Range 16 East and Township 7 South, Range 16 East, until the Black Butte Mountain, elevation 4504'; then west and northwest along the ridge line to the southwest corner of Township 5 South, Range 14 East; then north along the range line common to Range 14 East and Range 13 East; then west and northwest along the ridge line to Monument Mountain, elevation 4834'; then southwest and then northwest along the ridge line of the Little San Bernardino Mountains to Quail Mountain, elev. 5814'; then northwest along the ridge line to the Riverside-San Bernardino County line.
Far Eastern Riverside and San Bernardino Counties:
San Bernardino County (remainder) Unclassifiable/Attainment
Riverside County (remainder) Unclassifiable/Attainment.
Imperial County:
Imperial County Unclassifiable/Attainment.

a Includes Indian Country located in each county or area, except as otherwise specified.

1 This date is 90 days after January 5, 2005, unless otherwise noted.

2 This date is July 2, 2014, unless otherwise noted.

California - 2012 Annual PM2.5 NAAQS

[Primary]

Designated area1 Designation Classification
Date2 Type Date2 Type
Los Angeles-South Coast Air Basin, CA:
Los Angeles County (part) Nonattainment 12/9/20 Serious.
That portion of Los Angeles County which lies south and west of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary
Orange County Nonattainment 12/9/20 Serious.
Riverside County (part): That portion of Riverside County which lies to the west of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line (excluding the lands of the Santa Rosa Band of Cahuilla Mission Indians, and excluding the lands of the Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation) Nonattainment 12/9/20 Serious.
San Bernardino County (part) Nonattainment 12/9/20 Serious.
That portion of San Bernardino County which lies south and west of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary
Imperial County, CA:
Imperial County (part) Nonattainment Moderate.
That portion of Imperial County which lies within the line described as follows: (San Bernardino Base and Meridian) Beginning at the intersection of the United States-Mexico border and the southeast corner of Township 17 South, Range 11 East, then north along the range line of the eastern edge of Range 11 East, then east along the township line of the southern edge of Township 12 South to the northeast corner of Township 13 South, Range 15 East, then south along the range line common to Range 15 East and Range 16 East, to the United States-Mexico border
San Joaquin Valley, CA:
Fresno County Nonattainment Moderate.
Kern County (part) Nonattainment Moderate.
That portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon Land Grant boundary line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County boundary
Kings County Nonattainment Moderate.
Madera County Nonattainment Moderate.
Merced County Nonattainment Moderate.
San Joaquin County Nonattainment Moderate.
Stanislaus County Nonattainment Moderate.
Tulare County Nonattainment Moderate.
Plumas County, CA:
Plumas County (part) Nonattainment Moderate.
That portion of Plumas County within the following Super Planning Watersheds (SPWS), as defined by the State of California's Department of Conservation Statewide Watershed Program: Humbug Valley (#55183301), Sulpher Creek (#55183302), Frazier Creek (#55183303), and Eureka Lake (#55183304)
San Diego Air Basin, CA:
San Diego County (excluding the lands of the Pechanga Band of Luiseño Mission Indians of the Pechanga Reservation) Unclassifiable/Attainment
North Coast Air Basin:
Del Norte County Unclassifiable/Attainment
Humboldt County Unclassifiable/Attainment
Mendocino County Unclassifiable/Attainment
Sonoma County (part) Unclassifiable/Attainment
That portion of Sonoma County which lies north and west of a line described as follows: Beginning at the southeast corner of the Rancho Estero Americano Land Grant on the boundary line between Marin and Sonoma Counties; then running north along the east boundary line of Rancho Estero Americano Land Grant to the northeast corner thereof, being an angle corner in the westerly boundary line of the Rancho Canada de Jonive Land Grant, then running along the boundary of the Rancho Canada de Jonive Land Grant west, north and east to its intersection with the eastern line of Graton Road; then running along the east and south line of Graton Road north and east to its intersection with the east line of Sullivan Road; then running north along the east line of Sullivan Road to the southern line of Green Valley Road; then running east along the southern line of Green Valley Road and east along the southern line of State Highway 116, to the west and north line of Vine Hill Road; then running along the west and north line of Vine Hill Road, north and east to its intersection with the west line of Laguna Road; then running north along the west line of Laguna Road and the north projection thereof to the north line of Trenton Road; then running west along the north line of Trenton Road to the east line of Trenton-Healdsburg Road to the east line of Eastside Road; then running north along the east line of Eastside Road to its intersection with the southern line of Rancho Sotoyome Land Grant; then running east along the southern line of Rancho Sotoyome Land Grant to its intersection with the Township line common to Townships 8 and 9 North, Mount Diablo Base and Meridian; then running east along the township line to its intersection with the boundary line between Sonoma and Napa Counties
Trinity County Unclassifiable/Attainment
Northeast Plateau Air Basin, CA:
Lassen County Unclassifiable/Attainment
Modoc County Unclassifiable/Attainment
Siskiyou County Unclassifiable/Attainment
Lake County Air Basin, CA:
Lake County Unclassifiable/Attainment
Sacramento Valley Air Basin, CA:
Butte County Unclassifiable/Attainment
Colusa County Unclassifiable/Attainment
Glenn County Unclassifiable/Attainment
Placer County (part) Unclassifiable/Attainment
That portion of Placer County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of the Placer-El Dorado County line and the township line common to Township 12 North, Range 9 East and Township 13 North, Range 9 East, then running west along the township line common to Township 12 North, Range 9 East and Township 13 North, Range 9 East, then north along the range line common to Range 8 East and Range 9 East, to the Placer-Nevada County boundary
Sacramento County Unclassifiable/Attainment
Shasta County Unclassifiable/Attainment
Solano County (part) Unclassifiable/Attainment
That portion of Solano County which lies north and east of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1⁄4 section line running east and west through the center of Section 34, Township 6 North, Range 2 West, Mount Diablo Base and Meridian, then east along said 1⁄4 section line to the east boundary of Section 36, Township 6 North, Range 2 West, then south 1⁄2 mile and east 2 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West, then east along a line common to Township 5 North and Township 6 North to the northeast corner of Section 3, Township 5 North, Range 1 East, then south along section lines to the southeast corner of Section 10, Township 3 North, Range 1 East, then east along section lines to the south 1⁄4 corner of Section 8, Township 3 North, Range 2 East, then east to the boundary between Solano and Sacramento Counties
Sutter County Unclassifiable/Attainment
Tehama County Unclassifiable/Attainment
Yolo County Unclassifiable/Attainment
Yuba County Unclassifiable/Attainment
Mountain Counties:
Amador County Unclassifiable/Attainment
Calaveras County Unclassifiable/Attainment
El Dorado (part) Unclassifiable/Attainment
All portions of the county except that portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake
Mariposa County Unclassifiable/Attainment
Nevada County Unclassifiable/Attainment
Placer (part) Unclassifiable/Attainment
That portion of Placer County which is contained inside the two boundaries described as follows: 1. That portion of the county that lies east of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of the Placer-El Dorado County line and the township line common to Township 12 North, Range 9 East and Township 13 North, Range 9 East, then running west along the township line common to Township 12 North, Range 9 East and Township 13 North, Range 9 East, then north along the range line common to Range 8 East and Range 9 East, to the Placer-Nevada County boundary. 2. That portion of the county that lies west of the drainage area naturally tributary to Lake Tahoe including said Lake, plus west of the boundary of that area in the vicinity of the head of the Truckee River described as follows: Commencing at the point common to the aforementioned drainage area crestline and the line common to Townships 15 North and 16 North, Mount Diablo Base and Meridian, and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East Mount Diablo Base and Meridian, thence south along the west line of Sections 3 and 10, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, to the intersection with the said drainage area crestline, thence following the said drainage area boundary in a southeasterly, then northeasterly direction to and along the Lake Tahoe Dam, thence following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning
Plumas County (remainder) Unclassifiable/Attainment
Sierra County Unclassifiable/Attainment
Tuolumne County Unclassifiable/Attainment
Lake Tahoe Air Basin:
El Dorado County (part) Unclassifiable/Attainment
That portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake
Placer County (part) Unclassifiable/Attainment
That portion of Placer County within the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in the vicinity of the head of the Truckee River described as follows: commencing at the point common to the aforementioned drainage area crestline and the line common to Township 15 North and Township 16 North, Mount Diablo Base and Meridian, and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, then south along the west line of Sections 3 and 10, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, to the intersection with the said drainage area crestline, then following the said drainage area boundary in a southeasterly, then northeasterly direction to and along the Lake Tahoe Dam, then following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning
San Francisco Bay Area Air Basin:
Alameda County Unclassifiable/Attainment
Contra Costa County Unclassifiable/Attainment
Marin County Unclassifiable/Attainment
Napa County Unclassifiable/Attainment
San Francisco County Unclassifiable/Attainment
San Mateo County Unclassifiable/Attainment
Santa Clara County Unclassifiable/Attainment
Solano County (part) Unclassifiable/Attainment
That portion of Solano County which lies south and west of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1⁄4 section line running east and west through the center of Section 34, Township 6 North, Range 2 West, Mount Diablo Base and Meridian, then east along said 1⁄4 section line to the east boundary of Section 36, Township 6 North, Range 2 West, then south 1⁄2 mile and east 2 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West, then east along a line common to Township 5 North and Township 6 North to the northeast corner of Section 3, Township 5 North, Range 1 East, then south along section lines to the southeast corner of Section 10, Township 3 North, Range 1 East, then east along section lines to the south 1⁄4 corner of Section 8, Township 3 North, Range 2 East, then east to the boundary between Solano and Sacramento Counties
Sonoma County (part) Unclassifiable/Attainment
That portion of Sonoma County which lies south and east of a line described as follows: Beginning at the southeast corner of the Rancho Estero Americano Land Grant on the boundary line between Marin and Sonoma Counties; then running north along the east boundary line of Rancho Estero Americano Land Grant to the northeast corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive Land Grant, then running along the boundary of Rancho Canada de Jonive Land Grant west, north and east to its intersection with the eastern line of Graton Road; then running along the east and south line of Graton Road north and east to its intersection with the east line of Sullivan Road; then running north along the east line of Sullivan Road to the southern line of Green Valley Road; then running east along the southern line of Green Valley Road and east along the southern line of State Highway 116, to the west and north line of Vine Hill Road; then running along the west and north line of Vine Hill Road, north and east to its intersection with the west line of Laguna Road; then running north along the west line of Laguna Road and the north projection thereof to the north line of Trenton Road; then running west along the north line of Trenton Road to the east line of Trenton-Healdsburg Road to the east line of Eastside Road; then running north along the east line of Eastside Road to its intersection with the southern line of Rancho Sotoyome Land Grant; then running east along the southern line of Rancho Sotoyome Land Grant to its intersection with the Township line common to Townships 8 and 9 North, Mount Diablo Base and Meridian; then running east along the township line to its intersection with the boundary line between Sonoma and Napa Counties
North Central Coast Air Basin:
Monterey County Unclassifiable/Attainment
San Benito County Unclassifiable/Attainment
Santa Cruz County Unclassifiable/Attainment
South Central Coast Air Basin:
San Luis Obispo County Unclassifiable/Attainment
Santa Barbara County Unclassifiable/Attainment
Ventura County Unclassifiable/Attainment
Great Basin Valleys Air Basin:
Alpine County Unclassifiable/Attainment
Inyo County Unclassifiable/Attainment
Mono County Unclassifiable/Attainment
Mojave Desert Air Basin:
Kern County (part) Unclassifiable/Attainment
That portion of Kern County east and south of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon Land Grant boundary line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County boundary
Los Angeles County (remainder) Unclassifiable/Attainment
Riverside County (part) Unclassifiable/Attainment
That portion of Riverside County which lies to the east of a line described as follows: That segment of the southwestern boundary line of Hydrologic Unit Number 18100100 within Riverside County, further described as follows: Beginning at the Riverside-Imperial County boundary and running north along the range line common to Range 17 East and Range 16 East, San Bernardino Base and Meridian; then northwest along the ridge line of the Chuckwalla Mountains, through Township 8 South, Range 16 East and Township 7 South, Range 16 East, until the Black Butte Mountain, Elevation 45′05″; then west and northwest along the ridge line to the southwest corner of Township 5 South, Range 14 East; then north along the range line common to Range 14 East and Range 13 East; then west and northwest along the ridge line to Monument Mountain, elevation 4834′; then southwest and then northwest along the ridge line of the Little San Bernardino Mountains to Quail Mountain, elev. 5814′; then northwest along the ridge line to the Riverside-San Bernardino County line
San Bernardino County (remainder) Unclassifiable/Attainment
Salton Sea Air Basin:
Imperial County (remainder) Unclassifiable/Attainment
Riverside County (part) Unclassifiable/Attainment
That portion of Riverside County (including the lands of the Santa Rosa Band of Cahuilla Mission Indians within Riverside County) which lies to the east of a line described as follows: Beginning at the Riverside - San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East;, to the Riverside-San Bernardino County line: And that portion of Riverside County which lies to the west of a line described as follows: That segment of the southwestern boundary line of Hydrologic Unit Number 18100100 within Riverside County, further described as follows: Beginning at the Riverside-Imperial County boundary and running north along the range line common to Range 17 East and Range 16 East, San Bernardino Base and Meridian; then northwest along the ridge line of the Chuckwalla Mountains, through Township 8 South, Range 16 East and Township 7 South, Range 16 East, until the Black Butte Mountain, elevation 4504′; then west and northwest along the ridge line to the southwest corner of Township 5 South, Range 14 East; then north along the range line common to Range 14 East and Range 13 East; then west and northwest along the ridge line to Monument Mountain, elevation 4834′; then southwest and then northwest along the ridge line of the Little San Bernardino Mountains to Quail Mountain, elev. 5814′; then northwest along the ridge line to the Riverside-San Bernardino County line
Pechanga Band of Luiseño Mission Indians Unclassifiable/Attainment

1 Includes areas of Indian country located in each county or area, except as otherwise specified.

2 This date is April 15, 2015, unless otherwise noted.

California - 1997 24-Hour PM2.5 NAAQS

[Primary and Secondary]

Designated area Designationa Classification
Date1 Type Date2 Type
Chico, CA:
Butte County (part) Unclassifiable/Attainment
That portion of Butte County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of the Butte-Yuba county line and the township line common to T18N R6E and T19N R6E, west to the township line common to T18N R6E and T19N R6E, then north along the range line common to R5E and R6E, then west along the township line common to T21N and T20N, then north along the range line common to R4E and R5E, then west along the township line common to T24N and T23N to the Butte-Tehama County boundary.
Imperial County, CA:
Imperial County (part) Unclassifiable/Attainment
That portion of Imperial County which lies within the line described as follows: (San Bernardino Base and Meridan) Beginning at the intersection of the United States-Mexico border and the southeast corner of T17S R11E, then north along the range line of the eastern edge of range R11E, then east along the township line of the southern edge of T12S to the northeast corner of T13S R15E, then south along the range line common to R15E and R16E, to the United States-Mexico border.
Los Angeles-South Coast Air Basin, CA:
Los Angeles County (part) Nonattainment Moderate.
That portion of Los Angeles County which lies south and west of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then North along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17 and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
Orange County Nonattainment Moderate.
Riverside County (part) Nonattainment Moderate.
That portion of Riverside County which lies to the west of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County Line (excluding the lands of the Santa Rosa Band of Cahuilla Mission Indians).
That part of the lands of the Santa Rosa Band of Cahuilla Mission Indians which is excluded from the Riverside County (part) nonattainment area Nonattainment Moderate.
San Bernardino County (part) Nonattainment Moderate.
That portion of San Bernardino County which lies south and west of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary.
Sacramento, CA:
El Dorado County (part) Unclassifiable/Attainment
That portion of El Dorado County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of El Dorado-Amador county line and the township line common to townships T8N R10E and T8N R11E, then north along the range line common to ranges R10E and R11E, then east along the township line common to T9N and T8N, then north along the range line common to ranges R12E and R13E, then west along the township line common to T12N and T11N, then north along the range line common to ranges R10E and R11E, then west along the township line common to T13N and T12N, then north along the range line common to ranges R9E and R10E, to the El Dorado-Placer County boundary.
Placer County (part) Unclassifiable/Attainment
That portion of Placer County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of the Placer-El Dorado County line and the township line common to townships T12N R9E and T13N R9E, then running west along the township line common to townships T12N R9E and T13N R9E, then north along the range line common to ranges R8E and R9E, to the Placer-Nevada County boundary.
Sacramento County Unclassifiable/Attainment
Solano County (part) Unclassifiable/Attainment
That portion of Solano County which lies north and east of a line described as follows: beginning at the intersection of the westerly boundary of Solano County and the 1⁄4 section line running east and west through the center of Section 34; Township 6 North, Range 2 West, Mount Diablo Base and Meridian, thence east along said 1⁄4 section line to the east boundary of Section 36, Township 6 North, Range 2 West, thence south 1⁄2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West, thence east along a line common to Township 5 North and Township 6 North to the northeast corner of Section 3, Township 5 North, Range 1 East, thence south along section lines to the southeast corner of Section 10, Township 3 North, Range 1 East, thence east along section lines to the south 1⁄4 corner of Section 8, Township 3 North, Range 2 East, thence east to the boundary between Solano and Sacramento Counties.
Yolo County (part) Unclassifiable/Attainment
That portion of Yolo County which lies east of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of Yolo-Solano County boundary and the range line of the eastern edge of township T8N R2W, north along the range line of the eastern edge of township T8N R2W, continuing north along the range line common to ranges R2W and R1W, to the Yolo-Colusa County boundary.
San Francisco Bay Area, CA:
Alameda County Unclassifiable/Attainment
Contra Costa County Unclassifiable/Attainment
Marin County Unclassifiable/Attainment
Napa County Unclassifiable/Attainment
San Francisco County Unclassifiable/Attainment
San Mateo County Unclassifiable/Attainment
Santa Clara County Unclassifiable/Attainment
Solano County (part) Unclassifiable/Attainment
That portion of Solano County which lies south and west of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1⁄4 section line running east and west through the center of Section 34, Township 6 North, Range 2 West, Mount Diablo Base and Meridian, thence east along said 1⁄4 section line to the east boundary of Section 36, Township 6 North, Range 2 West, thence south 1⁄2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West thence east along a line common to T5N and T6N to the northeast corner of Section 3, T5N, R1E, thence south along section lines to the southeast corner of Section 10, T3N, R1E, thence east along section lines to the south 1⁄4 corner of Section 8, T3N, R2E, thence east to the boundary between Solano and Sacramento Counties.
Sonoma County (part) Unclassifiable/Attainment.
That portion of Sonoma County which lies south and east of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, M.D.M.; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties.
San Joaquin Valley, CA:
Fresno County Nonattainment 5/7/15 Serious.
Kern County (part) Nonattainment 5/7/15 Serious.
That portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of S. 3, T. 11 N., R. 17 W.; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S. 34, T. 32 S., R. 30 E., Mount Diablo Base and Meridian; then north to the northwest corner of S. 35, T. 31 S., R. 30 E.; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of S. 18, T. 31 S., R. 31 E.; then east to the southeast corner of S. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of S. 6, T. 29 S., R. 32 E.; then east to the southwest corner of S. 31, T. 28 S., R. 32 E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of S. 6, T. 28 S., R. 32 E., then west to the southeast corner of S. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary
Kings County Nonattainment 5/7/15 Serious.
Madera County Nonattainment 5/7/15 Serious.
Merced County Nonattainment 5/7/15 Serious.
San Joaquin County Nonattainment 5/7/15 Serious.
Stanislaus County Nonattainment 5/7/15 Serious.
Tulare County Nonattainment 5/7/15 Serious.
Yuba City-Marysville, CA:
Sutter County Unclassifiable/Attainment
Yuba County (part) Unclassifiable/Attainment
That portion of Yuba County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of the Yuba-Nevada county line and the range line common to ranges R7E and R8E, north to the southeast corner of township T18N R7E, then west along the township line common to T17N and T18N, then north along the range line common to ranges R6E and R7E, then west along the township line common to T19N and T18N to the Yuba-Butte County boundary.
North Coast Air Basin:
Del Norte County Unclassifiable/Attainment
Humboldt County Unclassifiable/Attainment
Mendocino County Unclassifiable/Attainment
Sonoma County (part) Unclassifiable/Attainment
That portion of Sonoma County which lies north and west of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive, thence running along said boundary of Rancho Canada de Jonive westerly; northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly and northerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road: thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 north, Mt. Diablo Base and Meridian; thence running easterly along said Township line to its intersection with the boundary line between Sonoma and Napa Counties, State of California.
Trinity County Unclassifiable/Attainment
Northeast Plateau Air Basin:
Lassen County Unclassifiable/Attainment
Modoc County Unclassifiable/Attainment.
Siskiyou County Unclassifiable/Attainment
Lake County Air Basin:
Lake County Unclassifiable/Attainment
Upper Sacramento Valley Region:
Butte County (remainder) Unclassifiable/Attainment
Colusa County Unclassifiable/Attainment
Glenn County Unclassifiable/Attainment
Shasta County Unclassifiable/Attainment
Tehama County Unclassifiable/Attainment
Yuba County (remainder) Unclassifiable/Attainment
Sacramento Metropolitan Region:
Yolo County (remainder) Unclassifiable/Attainment
Northern Mountain Counties:
Nevada County Unclassifiable/Attainment
Plumas County Unclassifiable/Attainment
Sierra County Unclassifiable/Attainment
Central Mountain Counties:
Amador County Unclassifiable/Attainment
Calaveras County Unclassifiable/Attainment
Southern Mountain Counties:
Mariposa County Unclassifiable/Attainment
Tuolumne County Unclassifiable/Attainment
Lake Tahoe Air Basin:
El Dorado County (remainder) Unclassifiable/Attainment
Placer County (remainder) Unclassifiable/Attainment
North Central Coast Air Basin:
Monterey County Unclassifiable/Attainment
San Benito County Unclassifiable/Attainment
Santa Cruz County Unclassifiable/Attainment
San Luis Obispo County:
San Luis Obispo County Unclassifiable/Attainment
Santa Barbara County:
Santa Barbara County (part) Unclassifiable/Attainment
Excluding San Miguel, Santa Rosa, Santa Cruz and Santa Barbara Islands
Santa Barbara County (part) Unclassifiable/Attainment
San Miguel, Santa Rosa, Santa Cruz and Santa Barbara Islands
Ventura County:
Ventura County (part) Unclassifiable/Attainment
Excluding Anacapa and San Nicolas Islands.
Ventura County (part) Unclassifiable/Attainment
Anacapa and San Nicolas Islands.
Great Basin Valleys Air Basin:
Alpine County Unclassifiable/Attainment
Inyo County (part) Unclassifiable/Attainment
That portion of Inyo County that Lies outside Hydrologic Unit Number 18090205.
Mono County Unclassifiable/Attainment
Coso Junction:
Inyo County (part) Unclassifiable/Attainment
That portion of Inyo County that lies inside Hydrologic Unit Number 18090205.
Eastern Kern County:
Kern County (part) Unclassifiable/Attainment
That portion of Kern County (with the exception of that portion in Hydrologic Unit Number 18090205 - the Indian Wells Valley) east and south of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; Then northwest Along the Rancho El Tejon line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County boundary.
Indian Wells Valley:
Kern County (part) Unclassifiable/Attainment
That portion of Kern County that lies inside Hydrologic Unit Number 18090205.
Western Mojave Desert and Antelope Valley:
Los Angeles County (part) Unclassifiable/Attainment
That portion of Los Angeles County which lies north and east of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
San Bernardino County (part) Unclassifiable/Attainment
That portion of San Bernardino County (with the exception of that portion in Hydrologic Unit Number 18090205) which lies north and east of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary; And that portion of San Bernardino County which lies south and west of a line described as follows: latitude 35 degrees, 10 minutes north and longitude 115 degrees, 45 minutes west.
Trona:
San Bernardino County (part) Unclassifiable/Attainment
That portion of San Bernardino County that lies inside Hydrologic Unit Number 18090205.
Coachella Valley:
Riverside County (part) Unclassifiable/Attainment
That portion of Riverside County which lies to the east of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then North along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line: And that portion of Riverside County which lies to the west of a line described as follows: That segment of the southwestern boundary line of Hydrologic Unit Number 18100100 within Riverside County, further described as follows: Beginning at the Riverside-Imperial County boundary and running north along the range line common to Range 17 East and Range 16 East, San Bernardino Base and Meridian; then northwest along the ridge line of the Chuckwalla Mountains, through Township 8 South, Range 16 East and Township 7 South, Range 16 East, until the Black Butte Mountain, Elevation 4504′; then west and northwest along the ridge line to the southwest corner of Township 5 South, Range 14 East; then north along the range line common to Range 14 East and Range 13 East; then west and northwest along the ridge line to Monument Mountain, elevation 4834′; then southwest and then northwest along the ridge line of the Little San Bernardino Mountains to Quail Mountain, elev. 5814′; then northwest along the ridge line to the Riverside-San Bernardino County line.
Far Eastern Riverside and San Bernardino Counties:
San Bernardino County (remainder) Unclassifiable/Attainment.
Riverside County (remainder) Unclassifiable/Attainment.
Imperial County (remainder) Unclassifiable/Attainment
San Diego County Unclassifiable/Attainment

a Includes Indian Country located in each county or area, except as otherwise specified.

1 This date is 90 days after January 5, 2005, unless otherwise noted.

2 This date is July 2, 2014, unless otherwise noted.

California - 2006 24-Hour PM2.5 NAAQS

[Primary and Secondary]

Designated area Designationa Classification
Date1 Type Date2 Type
Chico, CA:
Butte County (part) August 10, 2018 Attainment
That portion of Butte County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of the Butte-Yuba county line and the township line common to T18N R6E and T19N R6E, west to the township line common to T18N R6E and T19N R6E, then north along the range line common to R5E and R6E, then west along the township line common to T21N and T20N, then north along the range line common to R4E and R5E, then west along the township line common to T24N and T23N to the Butte-Tehama County boundary
Imperial County, CA:
Imperial County (part) Nonattainment Moderate.
That portion of Imperial County which lies within the line described as follows: (San Bernardino Base and Meridian) Beginning at the intersection of the United States-Mexico border and the southeast corner of T17S R11E, then north along the range line of the eastern edge of range R11E, then east along the township line of the southern edge of T12S to the northeast corner of T13S R15E, then south along the range line common to R15E and R16E, to the United States-Mexico border.
Los Angeles-South Coast Air Basin, CA:
Los Angeles County (part) Nonattainment 02/12/16 Serious.
That portion of Los Angeles County which lies south and west of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then North along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17 and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary Nonattainment 02/12/16 Serious.
Orange County Nonattainment 02/12/16 Serious.
Riverside County (part) Nonattainment 02/12/16 Serious.
That portion of Riverside County which lies to the west of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County Line (excluding the lands of the Santa Rosa Band of Cahuilla Mission Indians) Nonattainment 02/12/16 Serious.
That part of the lands of the Santa Rosa Band of Cahuilla Mission Indians which is excluded from the Riverside County (part) nonattainment area Unclassifiable/Attainment
San Bernardino County (part) Nonattainment 02/12/16 Serious.
That portion of San Bernardino County which lies south and west of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary Nonattainment 02/12/16 Serious.
Sacramento, CA:
El Dorado County (part) Nonattainment Moderate.
That portion of El Dorado County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of El Dorado-Amador county line and the township line common to townships T8N R10E and T8N R11E, then north along the range line common to ranges R10E and R11E, then east along the township line common to T9N and T8N, then north along the range line common to ranges R12E and R13E, then west along the township line common to T12N and T11N, then north along the range line common to ranges R10E and R11E, then west along the township line common to T13N and T12N, then north along the range line common to ranges R9E and R10E, to the El Dorado-Placer County boundary.
Placer County (part) Nonattainment Moderate.
That portion of Placer County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of the Placer-El Dorado County line and the township line common to townships T12N R9E and T13N R9E, then running west along the township line common to townships T12N R9E and T13N R9E, then north along the range line common to ranges R8E and R9E, to the Placer-Nevada County boundary.
Sacramento County Nonattainment Moderate.
Solano County (part) Nonattainment Moderate.
That portion of Solano County which lies north and east of a line described as follows: beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34; Township 6 North, Range 2 West, Mount Diablo Base and Meridian, thence east along said 1/4 section line to the east boundary of Section 36, Township 6 North, Range 2 West, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West, thence east along a line common to Township 5 North and Township 6 North to the northeast corner of Section 3, Township 5 North, Range 1 East, thence south along section lines to the southeast corner of Section 10, Township 3 North, Range 1 East, thence east along section lines to the south 1/4 corner of Section 8, Township 3 North, Range 2 East, thence east to the boundary between Solano and Sacramento Counties.
Yolo County (part) Nonattainment Moderate.
That portion of Yolo County which lies east of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of Yolo-Solano County boundary and the range line of the eastern edge of township T8N R2W, north along the range line of the eastern edge of township T8N R2W, continuing north along the range line common to ranges R2W and R1W, to the Yolo-Colusa County boundary.
San Francisco Bay Area, CA:
Alameda County Nonattainment Moderate.
Contra Costa County Nonattainment Moderate.
Marin County Nonattainment Moderate.
Napa County Nonattainment Moderate.
San Francisco County Nonattainment Moderate.
San Mateo County Nonattainment Moderate.
Santa Clara County Nonattainment Moderate.
Solano County (part) Nonattainment Moderate.
That portion of Solano County which lies south and west of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34, Township 6 North, Range 2 West, Mount Diablo Base and Meridian, thence east along said 1/4 section line to the east boundary of Section 36, Township 6 North, Range 2 West, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West thence east along a line common to T5N and T6N to the northeast corner of Section 3, T5N, R1E, thence south along section lines to the southeast corner of Section 10, T3N, R1E, thence east along section lines to the south 1/4 corner of Section 8, T3N, R2E, thence east to the boundary between Solano and Sacramento Counties.
Sonoma County (part) Nonattainment Moderate.
That portion of Sonoma County which lies south and east of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, M.D.M.; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties.
San Joaquin Valley, CA:
Fresno County Nonattainment 2/19/16 Serious.
Kern County (part) Nonattainment 2/19/16 Serious.
That portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of S. 3, T. 11 N., R. 17 W.; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S. 34, T. 32 S., R. 30 E., Mount Diablo Base and Meridian; then north to the northwest corner of S. 35, T. 31 S., R. 30 E.; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of S. 18, T. 31 S., R. 31 E.; then east to the southeast corner of S. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of S. 6, T. 29 S., R. 32 E.; then east to the southwest corner of S. 31, T. 28 S., R. 32 E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of S. 6, T. 28 S., R. 32 E., then west to the southeast corner of S. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary
Kings County Nonattainment 2/19/16 Serious.
Madera County Nonattainment 2/19/16 Serious.
Merced County Nonattainment 2/19/16 Serious.
San Joaquin County Nonattainment 2/19/16 Serious.
Stanislaus County Nonattainment 2/19/16 Serious.
Tulare County Nonattainment 2/19/16 Serious.
Yuba City-Marysville, CA
Sutter County 1/8/15 Attainment
Yuba County (part) 1/8/15 Attainment
That portion of Yuba County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of the Yuba-Nevada county line and the range line common to ranges R7E and R8E, north to the southeast corner of township T18N R7E, then west along the township line common to T17N and T18N, then north along the range line common to ranges R6E and R7E, then west along the township line common to T19N and T18N to the Yuba-Butte County boundary.
Rest of State:
North Coast Air Basin:
Del Norte County Unclassifiable/Attainment
Humboldt County Unclassifiable/Attainment
Mendocino County Unclassifiable/Attainment
Sonoma County (part) Unclassifiable/Attainment
That portion of Sonoma County which lies north and west of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive, thence running along said boundary of Rancho Canada de Jonive westerly; northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly and northerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road: thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 north, Mt. Diablo Base and Meridian; thence running easterly along said Township line to its intersection with the boundary line between Sonoma and Napa Counties, State of California.
Trinity County Unclassifiable/Attainment
Northeast Plateau Air Basin:
Lassen County Unclassifiable/Attainment
Modoc County Unclassifiable/Attainment
Siskiyou County Unclassifiable/Attainment
Lake County Air Basin:
Lake County Unclassifiable/Attainment
Upper Sacramento Valley Region:
Butte County (remainder) Unclassifiable/Attainment
Colusa County Unclassifiable/Attainment
Glenn County Unclassifiable/Attainment
Shasta County Unclassifiable/Attainment
Tehama County Unclassifiable/Attainment
Yuba County (remainder) Unclassifiable/Attainment
Sacramento Metropolitan Region:
Yolo County (remainder) Unclassifiable/Attainment
Northern Mountain Counties:
Nevada County Unclassifiable/Attainment
Plumas County Unclassifiable/Attainment
Sierra County Unclassifiable/Attainment
Central Mountain Counties:
Amador County Unclassifiable/Attainment
Calaveras County Unclassifiable/Attainment
Southern Mountain Counties:
Mariposa County Unclassifiable/Attainment
Tuolumne County Unclassifiable/Attainment
Lake Tahoe Air Basin:
El Dorado County (remainder) Unclassifiable/Attainment
Placer County (remainder) Unclassifiable/Attainment
North Central Coast Air Basin:
Monterey County Unclassifiable/Attainment
San Benito County Unclassifiable/Attainment
Santa Cruz County Unclassifiable/Attainment
San Luis Obispo County:
San Luis Obispo County Unclassifiable/Attainment
Santa Barbara County:
Santa Barbara County (part) Unclassifiable/Attainment
Excluding San Miguel, Santa Rosa, Santa Cruz, and Santa Barbara Islands
Santa Barbara County (part) Unclassifiable/Attainment
San Miguel, Santa Rosa, Santa Cruz, and Santa Barbara Islands
Ventura County:
Ventura County (part) Unclassifiable/Attainment
Excluding Anacapa and San Nicolas Islands.
Ventura County (part) Unclassifiable/Attainment
Anacapa and San Nicolas Islands.
Great Basin Valleys Air Basin:
Alpine County Unclassifiable/Attainment
Inyo County (part) Unclassifiable/Attainment
That portion of Inyo County that Lies outside Hydrologic Unit Number 18090205.
Mono County Unclassifiable/Attainment
Coso Junction:
Inyo County (part) Unclassifiable/Attainment
That portion of Inyo County that lies inside Hydrologic Unit Number 18090205.
Eastern Kern County:
Kern County (part) Unclassifiable/Attainment
That portion of Kern County (with the exception of that portion in Hydrologic Unit Number 18090205 - the Indian Wells Valley) east and south of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; Then northwest Along the Rancho El Tejon line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County boundary.
Indian Wells Valley:
Kern County (part) Unclassifiable/Attainment
That portion of Kern County that lies inside Hydrologic Unit Number 18090205.
Western Mojave Desert and Antelope Valley:
Los Angeles County (part) Unclassifiable/Attainment
That portion of Los Angeles County which lies north and east of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
San Bernardino County (part) Unclassifiable/Attainment
That portion of San Bernardino County (with the exception of that portion in Hydrologic Unit Number 18090205) which lies north and east of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary; And that portion of San Bernardino County which lies south and west of a line described as follows: latitude 35 degrees, 10 minutes north and longitude 115 degrees, 45 minutes west.
Trona:
San Bernardino County (part) Unclassifiable/Attainment
That portion of San Bernardino County that lies inside Hydrologic Unit Number 18090205.
Coachella Valley:
Riverside County (part) Unclassifiable/Attainment
That portion of Riverside County which lies to the east of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then North along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line: And that portion of Riverside County which lies to the west of a line described as follows: That segment of the southwestern boundary line of Hydrologic Unit Number 18100100 within Riverside County, further described as follows: Beginning at the Riverside-Imperial County boundary and running north along the range line common to Range 17 East and Range 16 East, San Bernardino Base and Meridian; then northwest along the ridge line of the Chuckwalla Mountains, through Township 8 South, Range 16 East and Township 7 South, Range 16 East, until the Black Butte Mountain, Elevation 45'05'′; then west and northwest along the ridge line to the southwest corner of Township 5 South, Range 14 East; then north along the range line common to Range 14 East and Range 13 East; then west and northwest along the ridge line to Monument Mountain, elevation 4834′; then southwest and then northwest along the ridge line of the Little San Bernardino Mountains to Quail Mountain, elev. 5814′; then northwest along the ridge line to the Riverside-San Bernardino County line.
Far Eastern Riverside and San Bernardino Counties:
San Bernardino County (remainder) Unclassifiable/Attainment
Riverside County (remainder) Unclassifiable/Attainment
Imperial County (remainder) Unclassifiable Attainment
San Diego County Unclassifiable/Attainment

a Includes Indian Country located in each county or area, except as otherwise specified.

1 This date is 30 days after November 13, 2009, unless otherwise noted.

2 This date is July 2, 2014, unless otherwise noted.

California - NO2 (1971 Annual Standard)

Designated area Does not meet primary standards Cannot be classified or better than national standards
North Coast Air Basin X
San Francisco Area Air Basin X
Lake County Air Basin X
North Central Coast Air Basin:
Monterey portion X
San Benito portion X
Santa Cruz portion X
South Central Coast Air Basin:
San Luis Obispo Count X
Santa Barbara AQMA X
Santa Barbara non-AQMA X
Ventura County X
Channel Islands X
San Diego Air Basin:
West San Diego County X
East San Diego County X
South Coast Air Basin X
San Joaquin Valley Air Basin:
Fresno County X
Kern County (SJVAS portion) X
Kings County X
Madera County X
Merced County X
San Joaquin County X
Stanislaus County X
Tulare County X
Sacramento Valley Air Basin:
Sacramento County X
Solano County (Sacramento Valley Air Basin portion) X
Yolo County X
Butte County X
Colusa County X
Glenn County X
Shasta County (Sacramento Valley portion) X
Sutter County X
Tehama County X
Yuba County X
Great Basin Valleys Air Basin X
Northeast Plateau Air Basin X
Mountain Counties Air Basin:
AQMA portion of Placer Co. County X
Placer County excluding AQMA portion and Lake Tahoe portion X
Anador County X
Calaveras County X
El Dorado County, excluding Lake Tahoe Air Basin portion X
Mariposa County X
Nevada County X
Plumas County X
Sierra County X
Tuolumne County X
Southeast Desert Air Basin County:
Kern County (S.E. Desert portion) County X
Imperial County X
Los Angeles County (portion within S.E. Desert Air Basin) X
Riverside County (portion not within South Coast Air Basin or Coachella Valley planning area) X
San Bernardino County (portion within S.E. Desert AQMA) X
Riverside County (Coachella Valley planning area) X
San Bernardino, non-AQMA X
Tahoe Air Basin X

California - NO2 (2010 1-Hour Standard)

Designated area Designationa
Date1 Type
Amador County APCD:
Amador County Unclassifiable/Attainment.
Antelope Valley AQMD:
Los Angeles County (part) Unclassifiable/Attainment.
That portion of Los Angeles County which lies north and east of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the township line common to T. 3 N and T. 2 N, San Bernardino Base and Meridian; then north along the range line common to R. 8 W and R. 9 W; then west along the township line common to T. 4 N and T. 3 N; then north along the range Line Common to R. 12 W and R. 13 W to the southeast corner of Section 12, T. 5 N, R. 13 W; then west along the south boundaries of Sections 12, 11, 10, 9, 8, 7, T. 5 N, R. 13 W to the boundary of the Angeles National Forest which is collinear with the range line common to R. 13 W and R. 14 W; then north and west along the Angeles National Forest boundary to the point of intersection with the township line common to T. 7 N and T. 6 N (point is at the northwest corner of Section 4 in T. 6 N, R. 14 W); then west along the township line common to T. 7 N and T. 6 N; then north along the range line common to R. 15 W and R. 16 W to the southeast corner of Section 13, T. 7 N, R. 16 W; then along the south boundaries of Sections 13, 14, 15, 16, 17, 18, T. 7 N, R. 16 W; then north along the range line common to R. 16 W and R. 17 W to the north boundary of the Angeles National Forest (collinear with township line common to T. 8 N and T. 7 N) then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary
Bay Area AQMD:
Alameda County Unclassifiable/Attainment.
Contra Costa County Unclassifiable/Attainment.
Marin County Unclassifiable/Attainment.
Napa County Unclassifiable/Attainment.
San Francisco County Unclassifiable/Attainment.
San Mateo County Unclassifiable/Attainment.
Santa Clara County Unclassifiable/Attainment.
Solano County (part) Unclassifiable/Attainment.
That portion of Solano County which lies south and west of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1⁄4 section line running east and west through the center of Section 34, T. 6 N, R. 2.W, Mount Diablo Base and Meridian, thence east along said 1⁄4 section line to the east boundary of Section 36, T. 6 N, R. 2 W, thence south 1⁄2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T. 5 N, R. 1 W, thence east along a line common to T. 5 N and T. 6 N to the northeast corner of Section 3, T. 5 N, R. 1 E, thence south along section lines to the southeast corner of Section 10, T. 3 N, R. 1 E, thence east along section lines to the south 1⁄4 corner of Section 8, T. 3 N, R. 2 E, thence east to the boundary between Solano and Sacramento Counties
Sonoma County (part) Unclassifiable/Attainment.
That portion of Sonoma County which lies south and east of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, Mount Diablo Meridian; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties
Butte County AQMD:
Butte County Unclassifiable/Attainment.
Calaveras County AQMD:
Calaveras County Unclassifiable/Attainment.
Colusa County AQMD:
Colusa County Unclassifiable/Attainment.
Eastern Kern APCD:
Kern County (part) Unclassifiable/Attainment.
That portion of Kern County east and south of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W and R. 17 W, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of Section 3, T. 11 N, R. 17 W; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of Section 34, T. 32 S, R. 30 E, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, T. 31 S, R. 30 E; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, T. 31 S, R. 31 E; then east to the southeast corner of Section 13, T. 31 S, R. 31 E; then north along the range line common to R. 31 E and R. 32 E, Mount Diablo Base and Meridian, to the northwest corner of Section 6, T. 29 S, R. 32 E; then east to the southwest corner of Section 31 T. 28 S, R. 32 E; then north along the range line common to R. 31 E and R. 32 E to the northwest corner of Section 6, T. 28 S, R. 32 E, then west to the southeast corner of Section 36, T. 27 S, R. 31 E, then north along the range line common to R. 31 E and R. 32 E to the Kern-Tulare County boundary
El Dorado County AQMD:
El Dorado County Unclassifiable/Attainment.
Feather River AQMD:
Sutter County Unclassifiable/Attainment.
Yuba County Unclassifiable/Attainment.
Glenn County APCD:
Glenn County Unclassifiable/Attainment.
Great Basin Unified APCD:
Alpine County Unclassifiable/Attainment.
Inyo County Unclassifiable/Attainment.
Mono County Unclassifiable/Attainment.
Imperial County APCD:
Imperial County Unclassifiable/Attainment.
Lake County AQMD:
Lake County Unclassifiable/Attainment.
Lassen County APCD:
Lassen County Unclassifiable/Attainment.
Mariposa County APCD:
Mariposa County Unclassifiable/Attainment.
Mendocino County AQMD:
Mendocino County Unclassifiable/Attainment.
Modoc County APCD:
Modoc County Unclassifiable/Attainment.
Mojave Desert AQMD:
Riverside County (part) Unclassifiable/Attainment.
That portion of Riverside County which lies east of a line described as follows: Beginning at the southwest corner of Section 32, T. 8 S, R. 20 E, San Bernardino Base and Meridian, on the Riverside-Imperial County Boundary; then northerly along section lines to the northwest corner of Section 5, T. 7 S, R. 20 E; then westerly along the township line to the southwest corner of Section 31, T. 6 S, R. 19 E; then northerly along the range line to the northwest corner of Section 6, T. 5 S, R. 19 E; then easterly along the township line to the southwest corner of Section 33, T. 4 S, R. 19 E; then northerly along section lines to the northwest corner of Section 4, T. 4 S, R. 19 E; then westerly along the township lines to the southwest corner of Section 32, T. 3 S, R. 19 E; then northerly along section lines to the northwest corner of Section 17, T. 3 S, R. 19 E; then westerly along the township line to the southwest corner of Section 7, T. 3 S, R. 19 E; then northerly along section lines to the northwest corner of Section 30, T. 2 S, R. 19 E; then westerly along the southerly line of Section 24, T. 2 S, R. 18 E, to the southwest corner thereof; then northerly along section lines to the northwest corner of Section 13, T. 2 S, R. 18 E; then westerly along section lines to the southwest corner of Section 10, T. 2 S, R. 18 E; then northerly along section lines to the Riverside-San Bernardino County boundary
San Bernardino County (part) Unclassifiable/Attainment.
That portion of San Bernardino County east and north of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to R. 3 E and R. 2 E, San Bernardino Base and Meridian; then west along the township line common to T. 3 N and T. 2 N to the San Bernardino-Los Angeles County boundary
Monterey Bay Unified APCD:
Monterey County Unclassifiable/Attainment.
San Benito County Unclassifiable/Attainment.
Santa Cruz County Unclassifiable/Attainment.
North Coast Unified AQMD:
Del Norte County Unclassifiable/Attainment.
Humboldt Count Unclassifiable/Attainment.
Trinity County Unclassifiable/Attainment.
Northern Sierra AQMD:
Nevada County Unclassifiable/Attainment.
Plumas County Unclassifiable/Attainment.
Sierra County Unclassifiable/Attainment.
Northern Sonoma County APCD:
Sonoma County (part) Unclassifiable/Attainment.
That portion of Sonoma County which lies north and west of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, Mount Diablo Meridian; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties.
Placer County APCD:
Placer County Unclassifiable/Attainment.
Sacramento Metropolitan AQMD:
Sacramento County Unclassifiable/Attainment.
San Diego County APCD:
San Diego County Unclassifiable/Attainment.
San Joaquin Valley Unified APCD:
Fresno County Unclassifiable/Attainment.
Kern County (part) Unclassifiable/Attainment.
That portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W and R. 17 W, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of Section 3, T. 11 N, R. 17 W; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of Section 34, T. 32 S, R. 30 E, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, T. 31 S, R. 30 E; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, T. 31 S, R. 31 E; then east to the southeast corner of Section 13, T. 31 S, R. 31 E; then north along the range line common to R. 31 E and R. 32 E, Mount Diablo Base and Meridian, to the northwest corner of Section 6, T. 29 S, R. 32 E; then east to the southwest corner of Section 31, T. 28 S, R. 32 E; then north along the range line common to R. 31 E and R. 32 E to the northwest corner of Section 6, T. 28 S, R. 32 E, then west to the southeast corner of Section 36, T. 27 S, R. 31 E, then north along the range line common to R. 31 E and R. 32 E to the Kern-Tulare County boundary.
Kings County Unclassifiable/Attainment.
Madera County Unclassifiable/Attainment.
Merced County Unclassifiable/Attainment.
San Joaquin County Unclassifiable/Attainment.
Stanislaus County Unclassifiable/Attainment.
Tulare County Unclassifiable/Attainment.
San Luis Obispo County APCD:
San Luis Obispo County Unclassifiable/Attainment.
Santa Barbara County APCD:
Santa Barbara County Unclassifiable/Attainment.
Shasta County AQMD:
Shasta County Unclassifiable/Attainment.
Siskiyou County APCD:
Siskiyou County Unclassifiable/Attainment.
South Coast AQMD:
Los Angeles County (part) Unclassifiable/Attainment.
That portion of Los Angeles County which lies south and west of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the township line common to T.3 N and T.2 N, San Bernardino Base and Meridian; then north along the range line common to R.8 W and R.9 W; then west along the township line common to T.4 N and T.3 N; then north along the range line common to R.12 W and R.13 W to the southeast corner of Section 12, T.5 N, R. 13 W; then west along the south boundaries of Sections 12, 11, 10, 9, 8, 7, T.5 N, R. 13 W to the boundary of the Angeles National Forest which is collinear with the range line common to R. 13 W and R. 14 W; then north and west along the Angeles National Forest boundary to the point of intersection with the township line common to T.7 N and T. 6 N (point is at the northwest corner of Section 4 in T.6 N, R. 14 W); then west along the township line common to T.7 N and T.6 N; then north along the range line common to R. 15 W and R. 16 W to the southeast corner of Section 13, T.7 N, R. 16 W; then along the south boundaries of Sections 13, 14, 15, 16, 17, 18, T.7 N, R. 16 W; then north along the range line common to R.16 W and R. 17 W to the north boundary of the Angeles National Forest (collinear with township line common to T.8 N and T.7 N); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
Orange County Unclassifiable/Attainment.
Riverside County (part) Unclassifiable/Attainment.
That portion of Riverside County which lies west of a line described as follows: Beginning at the southwest corner of Section 32, T. 8 S, R. 20 E, San Bernardino Base and Meridian, on the Riverside-Imperial County Boundary; then northerly along section lines to the northwest corner of Section 5, T. 7 S, R. 20 E; then westerly along the township line to the southwest corner of Section 31, T. 6 S, R. 19 E; then northerly along the range line to the northwest corner of Section 6, T. 5 S, R. 19 E; then easterly along the township line to the southwest corner of Section 33, T. 4 S, R. 19 E; then northerly along section lines to the northwest corner of Section 4, T. 4 S, R. 19 E; then westerly along the township lines to the southwest corner of Section 32, T. 3 S, R. 19 E; then northerly along section lines to the northwest corner of Section 17, T. 3 S, R. 19 E; then westerly along the township line to the southwest corner of Section 7, T. 3 S, R. 19 E; then northerly along section lines to the northwest corner of Section 30, T. 2 S, R. 19 E; then westerly along the southerly line of Section 24, T. 2 S, R. 18 E, to the southwest corner thereof; then northerly along section lines to the northwest corner of Section 13, T. 2 S, R. 18 E; then westerly along section lines to the southwest corner of Section 10, T. 2 S, R. 18 E; then northerly along section lines to the Riverside-San Bernardino County boundary.
San Bernardino County (part) Unclassifiable/Attainment.
That portion of San Bernardino County west and south of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to R. 3 E and R. 2 E; then west along the township line common to T. 3 N and T. 2 N to the San Bernardino-Los Angeles County boundary.
Tehama County APCD:
Tehama County Unclassifiable/Attainment.
Tuolumne County APCD:
Tuolumne County Unclassifiable/Attainment.
Ventura County APCD:
Ventura County Unclassifiable/Attainment.
Yolo-Solano AQMD:
Solano County Unclassifiable/Attainment.
That portion of Solano County which lies north and east of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1⁄4 section line running east and west through the center of Section 34, T. 6 N, R. 2 W, Mount Diablo Base and Meridian, thence east along said 1⁄4 section line to the east boundary of Section 36, T. 6 N, R. 2 W, thence south 1⁄2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T. 5 N, R. 1 W, thence east along a line common to T. 5 N and T. 6 N to the northeast corner of Section 3, T. 5 N, R. 1 E, thence south along section lines to the southeast corner of Section 10, T. 3 N, R. 1 E, thence east along section lines to the south 1⁄4 corner of Section 8, T. 3 N, R. 2 E, thence east to the boundary between Solano and Sacramento Counties.
Yolo County Unclassifiable/Attainment.

a Includes Indian Country located in each county or area, except as otherwise specified.

1 This date is 90 days after October 31, 2011, unless otherwise noted.

California - 1997 8-Hour Ozone NAAQS

[Primary and Secondary]

Designated area Designationa Category/classification
Date1 Type Date1 Type
Amador and Calaveras Cos., CA:
(Central Mountain Cos.)
Amador County Nonattainment 6/13/12 Subpart 2/Moderate.
Calaveras County Nonattainment 6/13/12 Subpart 2/Moderate.
Chico, CA:
Butte County Nonattainment 6/13/12 Subpart 2/Marginal.
Kern County (Eastern Kern), CA
Kern County (part) Nonattainment 6/13/12 Subpart 2/Moderate.
That portion of Kern County (with the exception of that portion in Hydrologic Unit Number 18090205 - the Indian Wells Valley) east and south of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County boundary
Imperial County, CA: Imperial County Nonattainment 3/14/08 Subpart 2/Moderate.
Los Angeles - South Coast Air Basin, CA:df Nonattainment (2) Subpart 2/Extreme.
Los Angeles County (part) Nonattainment (2) Subpart 2/Extreme.
That portion of Los Angeles County which lies south and west of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary
Orange County Nonattainment (2) Subpart 2/Extreme.
Riverside County (part) Nonattainment (2) Subpart 2/Extreme.
That portion of Riverside County which lies to the west of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line
San Bernardino County (part) Nonattainment (2) Subpart 2/Extreme.
That portion of San Bernardino County which lies south and west of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary
Pechanga Reservationc April 3, 2015 Attainment.
Morongo Band of Mission Indianse Nonattainment Subpart 2/Severe-17.
Los Angeles and San Bernardino Counties (Western Mojave Desert), CA Nonattainment 6/7/2012 Subpart 2/Severe-15.
Los Angeles County (part) Nonattainment 6/7/2012 Subpart 2/Severe-15.
That portion of Los Angeles County which lies north and east of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary
San Bernardino County (part) Nonattainment 6/7/2012 Subpart 2/Severe-15.
That portion of San Bernardino County which lies north and east of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary; And that portion of San Bernardino County which lies south and west of a line described as follows: latitude 35 degrees, 10 minutes north and longitude 115 degrees, 45 minutes west.
Mariposa and Tuolumne Cos., CA:
(Southern Mountain Counties)
Mariposa County Nonattainment 6/13/12 Subpart 2/Moderate.
Tuolumne County Nonattainment 6/13/12 Subpart 2/Moderate.
Riverside Co. (Coachella Valley), CA:
Riverside County (part)g Nonattainment 6/12/19 Subpart 2/Extreme.
That portion of Riverside County which lies to the east of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line. And that portion of Riverside County which lies to the west of a line described as follows: That segment of the southwestern boundary line of Hydrologic Unit Number 18100100 within Riverside County, further described as follows: Beginning at the Riverside-Imperial County boundary and running north along the range line common to Range 17 East and Range 16 East, San Bernardino Base and Meridian; then northwest along the ridge line of the Chuckwalla Mountains, through Township 8 South, Range 16 East and Township 7 South, Range 16 East, until the Black Butte Mountain, elevation 4504′; then west and northwest along the ridge line to the southwest corner of Township 5 South, Range 14 East; then north along the range line common to Range 14 East and Range 13 East; then west and northwest along the ridge line to Monument Mountain, elevation 4834′; then southwest and then northwest along the ridge line of the Little San Bernardino Mountains to Quail Mountain, elev. 5814′; then northwest along the ridge line to the Riverside-San Bernardino County line.
Agua Caliente Band of Cahuilla Indians of the Agua Caliente Indian Reservatione Nonattainment (2) Subpart 2/Severe-15.
Augustine Band of Cahuilla Indianse Nonattainment (2) Subpart 2/Severe-15.
Cabazon Band of Mission Indianse Nonattainment (2) Subpart 2/Severe-15.
Santa Rosa Band of Cahuilla Indianse Nonattainment (2) Subpart 2/Severe-15.
Torres Martinez Desert Cahuilla Indianse Nonattainment (2) Subpart 2/Severe-15.
Twenty-Nine Palms Band of Mission Indians of Californiae Nonattainment (2) Subpart 2/Severe-15.
Sacramento Metro, CA Nonattainment (2) Subpart 2/Severe-15.
El Dorado County (part) Nonattainment (2) Subpart 2/Severe-15.
All portions of the county, except that portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake.
Placer County (part) Nonattainment (2) Subpart 2/Severe-15.
All portions of the county except that portion of Placer County within the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in the vicinity of the head of the Truckee River described as follows: Commencing at the point common to the aforementioned drainage area crestline and the line common to Townships 15 North and 16 North, Mount Diablo Base and Meridian, and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, thence south along the west line of Sections 3 and 10, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, to the intersection with the said drainage area crestline, thence following the said drainage area boundary in a southeasterly, then northeasterly direction to and along the Lake Tahoe Dam, thence following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning.
Sacramento County Nonattainment (2) Subpart 2/Severe-15.
Solano County (part) Nonattainment (2) Subpart 2/Severe-15.
That portion of Solano County which lies north and east of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1⁄4 section line running east and west through the center of Section 34; Township 6 North, Range 2 West, Mount Diablo Base and Meridian, thence east along said 1⁄4 section line to the east boundary of Section 36, Township 6 North, Range 2 West, thence south 1⁄2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West, thence east along a line common to Township 5 North and Township 6 North to the northeast corner of Section 3, Township 5 North, Range 1 East, thence south along section lines to the southeast corner of Section 10, Township 3 North, Range 1 East, thence east along section lines to the south 1⁄4 corner of Section 8, Township 3 North, Range 2 East, thence east to the boundary between Solano and Sacramento Counties.
Sutter County (part) Nonattainment (2) Subpart 2/Severe-15.
Portion south of a line connecting the northern border of Yolo County to the SW tip of Yuba County and continuing along the southern Yuba County border to Placer County
Yolo County Nonattainment (2) Subpart 2/Severe-15.
San Diego, CA
San Diego County (part)f
That portion of San Diego County that excludes the areas listed below: La Posta Areas #1 and #2,b Cuyapaipe Area,b Manzanita Area,b Campo Areas #1 and #2b July 5, 2013 Attainment.
La Posta Areas #1 and #2b Unclassifiable/Attainment.
Cuyapaipe Areab Unclassifiable/Attainment.
Manzanita Areab Unclassifiable/Attainment.
Campo Areas #1 and #2b Unclassifiable/Attainment.
San Francisco Bay Area, CA Nonattainment Subpart 2/Marginal.
Alameda County Nonattainment Subpart 2/Marginal.
Contra Costa County Nonattainment Subpart 2/Marginal.
Marin County Nonattainment Subpart 2/Marginal.
Napa County Nonattainment Subpart 2/Marginal.
San Francisco County Nonattainment Subpart 2/Marginal.
San Mateo County Nonattainment Subpart 2/Marginal.
Santa Clara County Nonattainment Subpart 2/Marginal.
Solano County (part) Nonattainment Subpart 2/Marginal.
Portion of Solano County which lies south and west of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1⁄4 section line running east and west through the center of Section 34, T6N, R2W, M.D.B. & M., thence east along said 1⁄4 section line to the east boundary of Section 36, T6N, R2W, thence south 1⁄2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T5N, R1W, thence east along a line common to T5N and T6N to the northeast corner of Section 3, T5N, R1E, thence south along section lines to the southeast corner of Section 10, T3N, R1E, thence east along section lines to the south 1⁄4 corner of Section 8, T3N, R2E, thence east to the boundary between Solano and Sacramento Counties.
Sonoma County (part) Nonattainment Subpart 2/Marginal.
That portion of Sonoma County which lies south and east of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, M.D.M.; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties.
San Joaquin Valley, CA Nonattainment (2) Subpart 2/Extreme.
Fresno County Nonattainment (2) Subpart 2/Extreme.
Kern County (part) Nonattainment (2) Subpart 2/Extreme.
That portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of S. 3, T. 11 N., R. 17 W.; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S. 34, T. 32 S., R. 30 E., Mount Diablo Base and Meridian; then north to the northwest corner of S. 35, T. 31 S., R. 30 E.; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of S. 18, T. 31 S., R. 31 E.; then east to the southeast corner of S. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of S. 6, T. 29 S., R. 32 E.; then east to the southwest corner of S. 31, T. 28 S., R. 32 E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of S. 6, T. 28 S., R. 32 E., then west to the southeast corner of S. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary.
Kings County Nonattainment (2) Subpart 2/Extreme.
Madera County Nonattainment (2) Subpart 2/Extreme.
Merced County Nonattainment (2) Subpart 2/Extreme.
San Joaquin County Nonattainment (2) Subpart 2/Extreme.
Stanislaus County Nonattainment (2) Subpart 2/Extreme.
Tulare County Nonattainment (2) Subpart 2/Extreme.
Sutter County (part), CA:
Sutter County (part)
(Sutter Buttes) That portion of the Sutter Buttes mountain range at or above 2,000 feet in elevation Nonattainment 6/13/12 Subpart 2/Marginal.
Remainder of County Unclassifiable/Attainment
Ventura County, CA:
Ventura County (part) - That part of Ventura County excluding the Channel Islands of Anacapa and San Nicolas Islands. Nonattainment 6/19/08 Subpart 2/Serious.
Remainder of County Unclassifiable/Attainment
Nevada County (Western part), CA
Nevada County (part)
That portion of Nevada County, which lies west of a line, described as follows: beginning at the Nevada-Placer County boundary and running north along the western boundaries of Sections 24, 13, 12, 1, Township 17 North, Range 14 East, Mount Diablo Base and Meridian, and Sections 36, 25, 24, 13, 12, Township 18 North, Range 14 East to the Nevada-Sierra County boundary Nonattainment 6/13/12 Subpart 2/Moderate.
Santa Barbara-Santa Maria-Lompoc, CA:
Santa Barbara County Unclassifiable/Attainment
Mohave Desert Air Basin:
Riverside County (part) remainder Unclassifiable/Attainment
San Bernardino County (part) remainder Unclassifiable/Attainment
Great Basin Valleys Air Basin Unclassifiable/Attainment
Alpine County
Inyo County
Mono County
Lake County Air Basin Unclassifiable/Attainment
Lake County
Lake Tahoe Air Basin Unclassifiable/Attainment
El Dorado County (part)
Lake Tahoe Area: As described under 40 CFR 81.275.
Placer County (part)
Lake Tahoe Area: As described under 40 CFR 81.275.
Monterey Bay Area Unclassifiable/Attainment
Monterey County
San Benito County
Santa Cruz County
Mountain Counties Air Basin (remainder of):
Nevada County (part) remainder Unclassifiable/Attainment
Plumas County Unclassifiable/Attainment
Sierra County Unclassifiable/Attainment
North Coast Air Basin Unclassifiable/Attainment
Del Norte County
Humboldt County
Mendocino County
Sonoma County (part) remainder
Trinity County
Northeast Plateau Air Basin Unclassifiable/Attainment
Lassen County
Modoc County
Siskiyou County
Sacramento Valley Air Basin (remainder of):
Colusa County Unclassifiable/Attainment
Glenn County Unclassifiable/Attainment
Shasta County Unclassifiable/Attainment
Tehama County Unclassifiable/Attainment
Yuba County Unclassifiable/Attainment
South Central Coast Air Basin:
(remainder of)
Channel Islands Unclassifiable/Attainment
San Luis Obispo County Unclassifiable/Attainment

a Includes Indian Country located in each county or area, except as otherwise specified.

b The boundaries for these designated areas are based on coordinates of latitude and longitude derived from EPA Region 9's GIS database and are illustrated in a map entitled “Eastern San Diego County Attainment Areas for the 8-Hour Ozone NAAQS,” dated March 9, 2004, including an attached set of coordinates. The map and attached set of coordinates are available at EPA's Region 9 Air Division office. The designated areas roughly approximate the boundaries of the reservations for these tribes, but their inclusion in this table is intended for CAA planning purposes only and is not intended to be a federal determination of the exact boundaries of the reservations. Also, the specific listing of these tribes in this table does not confer, deny, or withdraw Federal recognition of any of the tribes so listed nor any of the tribes not listed.

c The use of reservation boundaries for this designation is for purposes of CAA planning only and is not intended to be a federal determination of the exact boundaries of the reservations. Nor does the specific listing of the Tribes in this table confer, deny, or withdraw Federal recognition of any of the Tribes listed or not listed.

d Excludes Morongo Band of Mission Indians' Indian country in Riverside County.

e Includes Indian country of the tribe listed in this table. Information pertaining to areas of Indian country in this table is intended for CAA planning purposes only and is not an EPA determination of Indian country status or any Indian country boundary. EPA lacks the authority to establish Indian country land status, and is making no determination of Indian country boundaries, in this table.

f Excludes the Pechanga Reservation.

g Excludes Indian country of the Agua Caliente Band of Cahuilla Indians, the Augustine Band of Cahuilla Mission Indians, the Cabazon Band of Mission Indians, the Santa Rosa Band of Cahuilla Indians, the Torres Martinez Desert Cahuilla Indians, and the Twenty-Nine Palms Band of Mission Indians in Riverside County.

1 This date is June 15, 2004, unless otherwise noted.

2 This date is June 4, 2010.

California-2008 8-Hour Ozone NAAQS

[Primary and Secondary]

Designated area Designation Classification
Date1 Type Date1 Type
Calaveras County, CA:2 Calaveras County Nonattainment Marginal.
Chico (Butte County), CA:2 Nonattainment Marginal.
Butte County
Berry Creek Rancheria of Maidu Indians of California3
Enterprise Rancheria of Maidu Indians of California3
Mechoopda Indian Tribe of Chico Rancheria3
Mooretown Rancheria of Maidu Indians of California3
Imperial County, CA:2 Nonattainment 6/3/16 Moderate.
Imperial County
Quechan Tribe of the Fort Yuma Indian Reservation3
Torres Martinez Desert Cahuilla Indians3
Kern County (Eastern Kern), CA:2 Nonattainment July 7, 2021 Severe-15.
Kern County (part):
That portion of Kern County (with the exception of that portion in Hydrologic Unit Number 18090205 - the Indian Wells Valley) east and south of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County boundary.
Los Angeles-San Bernardino Counties (West Mojave Desert), CA:2 Nonattainment Severe 15.
Los Angeles County (part)
That portion of Los Angeles County which lies north and east of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary
San Bernardino County (part)
That portion of San Bernardino County which lies north and east of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary; and that portion of San Bernardino County which lies south and west of a line described as follows: latitude 35 degrees, 10 minutes north and longitude 115 degrees, 45 minutes west
Twenty-Nine Palms Band of Mission Indians of California3
Los Angeles-South Coast Air Basin, CA2 Nonattainment Extreme.
Los Angeles County (part)
That portion of Los Angeles County which lies south and west of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary
Orange County
Riverside County (part)
That portion of Riverside County which lies to the west of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the southern boundaries of Sections 25, 26, and 27, Township 7 South, Range 4 East, then North along the west boundaries of Sections 27, 22, 15, 10, and 3 Township 7 South, Range 4 East, then East along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line.
San Bernardino County (part)
That portion of San Bernardino County which lies south and west of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary.
Cahuilla Band of Mission Indians of the Cahuilla Reservation3
Ramona Band of Cahuilla3
San Manuel Band of Mission Indians3
Soboba Band of Luiseno Indians3
Mariposa County, CA:2 Mariposa County Nonattainment 6/3/16 Moderate.
Nevada County (Western part), CA:2 Nonattainment 9/23/2019 Serious.
Nevada County (part):
That portion of Nevada County, which lies west of a line, described as follows: Beginning at the Nevada-Placer County boundary and running north along the western boundaries of Sections 24, 13, 12, 1, Township 17 North, Range 14 East, Mount Diablo Base and Meridian, and Sections 36, 25, 24, 13, 12, Township 18 North, Range 14 East to the Nevada-Sierra County boundary
Riverside County (Coachella Valley), CA:2 Nonattainment Severe 15.
Riverside County (part)
That portion of Riverside County which lies to the east of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line. And that portion of Riverside County which lies to the west of a line described as follows: That segment of the southwestern boundary line of hydrologic Unit Number 18100100 within Riverside County.
Agua Caliente Band of Cahuilla Indians of the Agua Caliente Indian Reservation3
Augustine Band of Cahuilla Indians3
Cabazon Band of Mission Indians3
Santa Rosa Band of Cahuilla Indians3
Torres Martinez Desert Cahuilla Indians3
Twenty-Nine Palms Band of Mission Indians of California3
Sacramento Metro, CA:2 Nonattainment Severe 15.
El Dorado County (part)
All portions of the county except that portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake.
Placer County (part)
All portions of the county except that portion of Placer County within the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in the vicinity of the head of the Truckee River described as follows: Commencing at the point common to the aforementioned drainage area crestline and the line common to Townships 15 North and 16 North, Mount Diablo Base and Meridian, and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East Mount Diablo Base and Meridian, thence south along the west line of Sections 3 and 10, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, to the intersection with the said drainage area crestline, thence following the said drainage area boundary in a southeasterly, then northeasterly direction to and along the Lake Tahoe Dam, thence following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning.
Sacramento County
Solano County (part)
That portion of Solano County which lies north and east of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1⁄4 section line running east and west through the center of Section 34; Township 6 North, Range 2 West, Mount Diablo Base and Meridian, thence east along said 1⁄4 section line to the east boundary of Section 36, Township 6 North, Range 2 West, thence south 1⁄2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West, thence east along a line common to Township 5 North and Township 6 North to the northeast corner of Section 3, Township 5 North, Range 1 East, thence south along section lines to the southeast corner of Section 10, Township 3 North, Range 1 East, thence east along section lines to the south 1⁄4 corner of Section 8, Township 3 North, Range 2 East, thence east to the boundary between Solano and Sacramento Counties.
Sutter County (part)
Portion south of a line connecting the northern border of Yolo County to the SW tip of Yuba County and continuing along the southern Yuba County border to Placer County.
Yolo County
Shingle Springs Band of Miwok Indians, Shingle Springs Rancheria (Verona Tract)3
United Auburn Indian Community of the Auburn Rancheria of California3
Yocha Dehe Wintun Nation3
San Diego County, CA Nonattainment July 2, 2021 Severe-15.
San Diego County:
Barona Group of Capitan Grande Band of Mission Indians of the Barona Reservation. 3
Campo Band of Diegueno Mission Indians of the Campo Indian Reservation. 3
Capitan Grande Band of Diegueno Mission Indians of California. 3
Ewiiaapaayp Band of Kumeyaay Indians. 3
Iipay Nation of Santa Ysabel. 3
Inaja Band of Diegueno Mission Indians of the Inaja and Cosmit Reservation. 3
Jamul Indian Village of California. 3
La Jolla Band of Luiseno Indians. 3
La Posta Band of Diegueno Mission Indians of the La Posta Indian Reservation. 3
Los Coyotes Band of Cahuilla and Cupeno Indians. 3
Manzanita Band of Diegueno Mission Indians of the Manzanita Reservation. 3
Mesa Grande Band of Diegueno Mission Indians of the Mesa Grande Reservation. 3
Pala Band of Luiseno Mission Indians of the Pala Reservation. 3
Pauma Band of Luiseno Mission Indians of the Pauma and Yuima Reservation. 3
Rincon Band of Luiseno Mission Indians of the Rincon Reservation. 3
San Pasqual Band of Diegueno Mission Indians of California. 3
Sycuan Band of the Kumeyaay Nation. 3
Viejas (Baron Long) Group of Capitan Grande Band of Mission Indians. 3
San Francisco Bay Area, CA:2 Nonattainment Marginal.
Alameda County
Contra Costa County
Marin County
Napa County
San Francisco County
San Mateo County
Santa Clara County
Solano County (part)
Portion of Solano County which lies south and west of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1⁄4 section line running east and west through the center of Section 34, T6N, R2W, M.D.B. & M., thence east along said 1⁄4 section line to the east boundary of Section 36, T6N, R2W, thence south 1⁄2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T5N, R1W, thence east along a line common to T5N and T6N to the northeast corner of Section 3, T5N, R1E, thence south along section lines to the southeast corner of Section 10, T3N, R1E, thence east along section lines to the south 1⁄4 corner of Section 8, T3N, R2E, thence east to the boundary between Solano and Sacramento Counties.
Sonoma County (part)
That portion of Sonoma County which lies south and east of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence Running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, M.D.M.; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties.
Federated Indians of Graton Rancheria3
Lytton Rancheria of California3
San Joaquin Valley, CA:2 Nonattainment Extreme.
Fresno County
Kern County (part)
That portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of S. 3, T. 11 N., R. 17 W.; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S. 34, T. 32 S., R. 30 E., Mount Diablo Base and Meridian; then north to the northwest corner of S. 35, T. 31 S., R. 30 E.; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of S. 18, T. 31 S., R. 31 E.; then east to the southeast corner of S. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of S. 6, T. 29 S., R. 32 E.; then east to the southwest corner of S. 31, T. 28 S., R. 32 E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of S. 6, T. 28 S., R. 32 E., then west to the southeast corner of S. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary.
Kings County
Madera County
Merced County
San Joaquin County
Stanislaus County
Tulare County
Big Sandy Rancheria of Mono Indians of California3
Cold Springs Rancheria of Mono Indians of California3
Northfork Rancheria of Mono Indians of California3
Picayune Rancheria of Chukchansi Indians of California3
Santa Rosa Indian Community of the Santa Rosa Rancheria3
Table Mountain Rancheria of California3
Tule River Indian Tribe of the Tule River Reservation3
San Luis Obispo (Eastern San Luis Obispo), CA:2 Nonattainment 6/3/16 Marginal.5
San Luis Obispo County (part)
That portion of San Luis Obispo County that lies east of a line described as follows: Beginning at the San Luis Obispo County/Santa Barbara County boundary and running north along 120 degrees 24 minutes longitude to the intersection with 35 degrees 27 minutes latitude; east along 35 degrees 27 minutes latitude to the intersection with 120 degrees 18 minutes longitude; then north along 120 degrees 18 minutes longitude to the San Luis Obispo County/Monterey County boundary
Tuscan Buttes, CA:2 Nonattainment Marginal.
Tehama County (part)
Those portions of the immediate Tuscan Buttes area at or above 1,800 feet in elevation.
Ventura County, CA:2 Nonattainment Serious.
Ventura County (part)
That part of Ventura County excluding the Channel Islands of Anacapa and San Nicolas Islands.
Morongo Band of Mission Indians3 Nonattainment Serious.
Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation3 Nonattainment Moderate.
Rest of State:4
Alpine, Inyo, and Mono Counties: Unclassifiable/Attainment
Alpine County
Inyo County
Mono County
Amador County Unclassifiable/Attainment
Channel Islands (Ventura County) Unclassifiable/Attainment
Ventura County (part) remainder
Colusa County Unclassifiable/Attainment
Del Norte, Humboldt, and Trinity Counties): Unclassifiable/Attainment
Del Norte County
Humboldt County
Trinity County
Nevada County (part) remainder Unclassifiable/Attainment
Glenn County Unclassifiable/Attainment
Kern County (part) remainder Unclassifiable/Attainment
Lake County Unclassifiable/Attainment
Lake Tahoe (El Dorado County Portion): Unclassifiable/Attainment
El Dorado County (part) remainder
Lake Tahoe (Placer County Portion): Unclassifiable/Attainment
Placer County (part) remainder
Lassen County Unclassifiable/Attainment
Mendocino County Unclassifiable/Attainment
Modoc County Unclassifiable/Attainment
Monterey County Unclassifiable/Attainment
Northeastern San Bernardino County and Eastern Riverside County Unclassifiable/Attainment
San Bernardino County (part) remainder
Riverside County (part) remainder
Sonoma County (part) remainder Unclassifiable/Attainment
Sutter County and Yuba County Unclassifiable/Attainment
Sutter County (part) remainder
Yuba County
Plumas and Sierra Counties Unclassifiable/Attainment
San Benito County Unclassifiable/Attainment
Santa Barbara County Unclassifiable/Attainment
Santa Cruz County Unclassifiable/Attainment
Shasta County Unclassifiable/Attainment
Siskiyou County Unclassifiable/Attainment
Tehama County (part) remainder Unclassifiable/Attainment
Tuolumne County Unclassifiable/Attainment
San Luis Obispo County (part) remainder Unclassifiable/Attainment

1 This date is July 20, 2012, unless otherwise noted.

2 Excludes Indian country located in each area, unless otherwise noted.

3 Includes Indian country of the tribe listed in this table located in the identified area. Information pertaining to areas of Indian country in this table is intended for CAA planning purposes only and is not an EPA determination of Indian country status or any Indian country boundary. EPA lacks the authority to establish Indian country land status, and is making no determination of Indian country boundaries, in this table.

4 Includes any Indian country in each county or area, unless otherwise specified.

California - 2015 8-Hour Ozone NAAQS

[Primary and Secondary]

Designated area1 Designation Classification
Date2 Type Date2 Type
Amador County, CA Nonattainment Marginal.
Amador County:
Buena Vista Rancheria of Me-Wuk Indians of California.
Jackson Band of Miwuk Indians.
Butte County, CA Nonattainment Marginal.
Butte County:
Berry Creek Rancheria of Maidu Indians of California.
Enterprise Rancheria of Maidu Indians of California.
Mechoopda Indian Tribe of Chico Rancheria.
Mooretown Rancheria of Maidu Indians of California.
Calaveras County, CA Nonattainment Marginal.
Calaveras County:
California Valley Miwok Tribe.
Imperial County, CA Nonattainment Marginal.
Imperial County:
Quechan Tribe of the Fort Yuma Indian Reservation.
Torres Martinez Desert Cahuilla Indians.
Kern County (Eastern Kern), CA Nonattainment 11/29/21 Serious.
Kern County (part):
That portion of Kern County (with the exception of that portion in Hydrologic Unit Number 18090205 - the Indian Wells Valley) east and south of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County boundary.
Los Angeles-San Bernardino Counties (West Mojave Desert), CA Nonattainment Severe-15.
Los Angeles County (part):
That portion of Los Angeles County which lies north and east of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
San Bernardino County (part):
That portion of San Bernardino County which lies north and east of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary; and that portion of San Bernardino County which lies south and west of a line described as follows: Latitude 35 degrees, 10 minutes north and longitude 115 degrees, 45 minutes west.
Twenty-Nine Palms Band of Mission Indians of California.
Los Angeles-South Coast Air Basin, CA Nonattainment Extreme.
Los Angeles County (part):
That portion of Los Angeles County which lies south and west of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
Orange County.
Riverside County (part):
That portion of Riverside County which lies to the west of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the southern boundaries of Sections 25, 26, and 27, Township 7 South, Range 4 East, then North along the west boundaries of Sections 27, 22, 15, 10, and 3 Township 7 South, Range 4 East, then East along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line.
San Bernardino County (part):
That portion of San Bernardino County which lies south and west of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary.
Cahuilla Band of Indians.
Pechanga Band of Luiseño Mission Indians of the Pechanga Reservation:
Includes only non-contiguous tribal lands known as the Meadowbrook parcel.3
Ramona Band of Cahuilla.
San Manuel Band of Mission Indians.
Soboba Band of Luiseño Indians.
Mariposa County, CA Nonattainment Marginal.
Mariposa County.
Nevada County (Western part), CA Nonattainment Moderate.
Nevada County (part):
That portion of Nevada County, which lies west of a line, described as follows: Beginning at the Nevada-Placer County boundary and running north along the western boundaries of Sections 24, 13, 12, 1, Township 17 North, Range 14 East, Mount Diablo Base and Meridian, and Sections 36, 25, 24, 13, 12, Township 18 North, Range 14 East to the Nevada-Sierra County boundary.
Riverside County (Coachella Valley), CA Nonattainment Severe-15.
Riverside County (part):
That portion of Riverside County which lies to the east of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line. And that portion of Riverside County which lies to the west of a line described as follows: That segment of the southwestern boundary line of hydrologic Unit Number 18100100 within Riverside County.
Agua Caliente Band of Cahuilla Indians of the Agua Caliente Indian Reservation.
Augustine Band of Cahuilla Indians.
Cabazon Band of Mission Indians.
Santa Rosa Band of Cahuilla Indians.
Torres Martinez Desert Cahuilla Indians.
Twenty-Nine Palms Band of Mission Indians of California.
Sacramento Metro, CA Nonattainment Moderate.
El Dorado County (part):
All portions of the county except that portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake.
Placer County (part):
All portions of the county except that portion of Placer County within the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in the vicinity of the head of the Truckee River described as follows: Commencing at the point common to the aforementioned drainage area crestline and the line common to Townships 15 North and 16 North, Mount Diablo Base and Meridian, and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East Mount Diablo Base and Meridian, thence south along the west line of Sections 3 and 10, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, to the intersection with the said drainage area crestline, thence following the said drainage area boundary in a southeasterly, then northeasterly direction to and along the Lake Tahoe Dam, thence following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning.
Sacramento County.
Solano County (part):
That portion of Solano County which lies north and east of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1⁄4 section line running east and west through the center of Section 34; Township 6 North, Range 2 West, Mount Diablo Base and Meridian, thence east along said 1⁄4 section line to the east boundary of Section 36, Township 6 North, Range 2 West, thence south 1⁄2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West, thence east along a line common to Township 5 North and Township 6 North to the northeast corner of Section 3, Township 5 North, Range 1 East, thence south along section lines to the southeast corner of Section 10, Township 3 North, Range 1 East, thence east along section lines to the south 1⁄4 corner of Section 8, Township 3 North, Range 2 East, thence east to the boundary between Solano and Sacramento Counties.
Sutter County (part):
Portion south of a line connecting the northern border of Yolo County to the SW tip of Yuba County and continuing along the southern Yuba County border to Placer County.
Yolo County:
Shingle Springs Band of Miwok Indians, Shingle Springs Rancheria.
United Auburn Indian Community of the Auburn Rancheria of California.
Wilton Rancheria.
Yocha Dehe Wintun Nation.
San Diego County, CA 2 Nonattainment July 2, 2021 Severe-15.
San Diego County: 2
Barona Group of Capitan Grande Band of Mission Indians of the Barona Reservation.
Campo Band of Diegueno Mission Indians of the Campo Indian Reservation.
Capitan Grande Band of Diegueno Mission Indians of California.
Ewiiaapaayp Band of Kumeyaay Indians.
Iipay Nation of Santa Ysabel.
Inaja Band of Diegueno Mission Indians of the Inaja and Cosmit Reservation.
Jamul Indian Village of California.
La Jolla Band of Luiseno Indians.
La Posta Band of Diegueno Mission Indians of the La Posta Indian Reservation.
Los Coyotes Band of Cahuilla and Cupeno Indians.
Manzanita Band of Diegueno Mission Indians of the Manzanita Reservation.
Mesa Grande Band of Diegueno Mission Indians of the Mesa Grande Reservation.
Pala Band of Luiseno Mission Indians of the Pala Reservation.
Pauma Band of Luiseno Mission Indians of the Pauma and Yuima Reservation.
Rincon Band of Luiseno Mission Indians of the Rincon Reservation.
San Pasqual Band of Diegueno Mission Indians of California.
Sycuan Band of the Kumeyaay Nation.
Viejas (Baron Long) Group of Capitan Grande Band of Mission Indians.
San Francisco Bay Area, CA Nonattainment Marginal.
Alameda County.
Contra Costa County.
Marin County.
Napa County.
San Francisco County.
San Mateo County.
Santa Clara County.
Solano County (part):
Portion of Solano County which lies south and west of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1⁄4 section line running east and west through the center of Section 34, T6N, R2W, M.D.B. & M., thence east along said 1⁄4 section line to the east boundary of Section 36, T6N, R2W, thence south 1⁄2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T5N, R1W, thence east along a line common to T5N and T6N to the northeast corner of Section 3, T5N, R1E, thence south along section lines to the southeast corner of Section 10, T3N, R1E, thence east along section lines to the south 1⁄4 corner of Section 8, T3N, R2E, thence east to the boundary between Solano and Sacramento Counties.
Sonoma County (part):
That portion of Sonoma County which lies south and east of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence Running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, M.D.M.; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties.
Federated Indians of Graton Rancheria.
Lytton Rancheria of California.
San Joaquin Valley, CA Nonattainment Extreme.
Fresno County.
Kern County (part):
That portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W and R. 17 W, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of S 3, T. 11 N, R. 17 W; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S 34, T. 32 S, R. 30 E, Mount Diablo Base and Meridian; then north to the northwest corner of S 35, T. 31 S, R. 30 E; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of S 18, T. 31 S, R. 31 E; then east to the southeast corner of S 13, T. 31 S, R. 31 E; then north along the range line common to R. 31 E and R. 32 E, Mount Diablo Base and Meridian, to the northwest corner of S 6, T. 29 S, R. 32 E; then east to the southwest corner of S 31, T. 28 S, R. 32 E; then north along the range line common to R. 31 E and R. 32 E to the northwest corner of S 6, T. 28 S, R. 32 E, then west to the southeast corner of S 36, T. 27 S, R. 31 E, then north along the range line common to R. 31 E and R. 32 E to the Kern-Tulare County boundary.
Kings County.
Madera County.
Merced County.
San Joaquin County.
Stanislaus County.
Tulare County:
Big Sandy Rancheria of Western Mono Indians of California.
Cold Springs Rancheria of Mono Indians of California.
Northfork Rancheria of Mono Indians of California.
Picayune Rancheria of Chukchansi Indians of California.
Santa Rosa Indian Community of the Santa Rosa Rancheria.
Table Mountain Rancheria of California.
Tule River Indian Tribe of the Tule River Reservation.
San Luis Obispo (Eastern part), CA Nonattainment Marginal.
San Luis Obispo County (part):
That portion of San Luis Obispo County that lies east of a line described as follows: Beginning at the San Luis Obispo County/Santa Barbara County boundary and running north along 120 degrees 24 minutes longitude to the intersection with 35 degrees 27 minutes latitude; east along 35 degrees 27 minutes latitude to the intersection with 120 degrees 18 minutes longitude; then north along 120 degrees 18 minutes longitude to the San Luis Obispo County/Monterey County boundary.
Sutter Buttes, CA Nonattainment Marginal.
Sutter County (part):
That portion of the Sutter Buttes mountain range at or above 2,000 feet in elevation.
Tuolumne County, CA Nonattainment Marginal.
Tuolumne County:
Chicken Ranch Rancheria of Me-Wuk Indians of California.
Tuolumne Band of Me-Wuk Indians of the Tuolumne Rancheria of California.
Tuscan Buttes, CA Nonattainment Marginal (Rural Transport).
Tehama County (part):
Those portions of the immediate Tuscan Buttes area at or above 1,800 feet in elevation.
Ventura County, CA Nonattainment Serious.
Ventura County (part):
That part of Ventura County excluding the Channel Islands of Anacapa and San Nicolas Islands.
Morongo Band of Mission Indians4 Nonattainment Serious.
Pechanga Band of Luiseño Mission Indians of the Pechanga Reservation Nonattainment Marginal.
Includes the main body of the contiguous Pechanga Band Reservation and the noncontiguous area known as Pu'eska Mountain, excluding non-contiguous tribal lands in the Los Angeles-South Coast Air Basin, CA (Meadowbrook parcel).3
Rest of State:
Colusa County Attainment/Unclassifiable
Eastern Nevada County Attainment/Unclassifiable
Nevada County (part) remainder.
Eastern Riverside County Attainment/Unclassifiable
Riverside County (part) remainder.
Glenn County Attainment/Unclassifiable
Inyo County Attainment/Unclassifiable
Lake County 1/16/18 Attainment/Unclassifiable
Lake Tahoe Air Basin Attainment/Unclassifiable
El Dorado County (part) remainder.
Placer County (part) remainder.
North Central Coast Air Basin Attainment/Unclassifiable
Monterey County.
San Benito County.
Santa Cruz County.
North Coast Air Basin Attainment/Unclassifiable
Del Norte County 1/16/18
Humboldt County 1/16/18
Mendocino County.
Sonoma County (part) remainder.
Trinity County.
Northeast Plateau Air Basin 1/16/18 Attainment/Unclassifiable
Lassen County.
Modoc County.
Siskiyou County.
Northeastern Kern County Attainment/Unclassifiable
Kern County (part) remainder.
Northeast San Bernardino County Attainment/Unclassifiable
San Bernardino County (part) remainder.
Northern Channel Islands. Attainment/Unclassifiable
The Channel Islands located in the South Central Coast Air Basin: Anacapa, San Miguel, San Nicholas, Santa Barbara, Santa Cruz, and Santa Rosa Islands.
Northern Great Basin Valleys Air Basin Attainment/Unclassifiable
Alpine County.
Mono County.
Northern Mountain Counties Attainment/Unclassifiable
Plumas County.
Sierra County.
Santa Barbara County (part) remainder Attainment/Unclassifiable
That part of Santa Barbara County excluding the Channel Islands of San Miguel, Santa Barbara, Santa Cruz, and Santa Rosa Islands.
Shasta County Attainment/Unclassifiable
Sutter and Yuba Counties Attainment/Unclassifiable
Sutter County (part) remainder.
Yuba County.
Tehama County (part) remainder Attainment/Unclassifiable
Western San Luis Obispo County Attainment/Unclassifiable
San Luis Obispo County (part) remainder.

1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.

2 This date is August 3, 2018, unless otherwise noted.

3 See Section 23.0 of the EPA's technical support document for California, titled “California Final Area Designations for the 2015 Ozone National Ambient Air Quality Standards Technical Support Document (TSD),” for more information and maps showing the locations of the main body of the reservation and the non-contiguous Pu'eska Mountain and Meadowbrook lands (available in Docket ID: EPA-HQ-OAR-2017-0548).

4 See Section 22.0 of the EPA's technical support document for California, titled “California Final Area Designations for the 2015 Ozone National Ambient Air Quality Standards Technical Support Document (TSD),” for more information and maps showing the boundaries of the nonattainment area (available in Docket ID: EPA-HQ-OAR-2017-0548).

California - 2008 Lead NAAQS

Designated area Designation for the 2008 NAAQSa
Date1 Type
Los Angeles County - South Coast Air Basin, CA:
Los Angeles County (part) 12/31/10 Nonattainment.
That portion of Los Angeles County which lies south and west of line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then North along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17 and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with The Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
Rest of State Unclassifiable/Attainment.

a Includes Indian Country located in each county or area, except as otherwise specified.

1 December 31, 2011 unless otherwise noted.

[43 FR 8964, Mar. 3, 1978]

Editorial Note

Editorial Note:

For Federal Register citations affecting § 81.305, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.govinfo.gov.


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