The Northeastern Plains Intrastate Air Quality Control Region (New Mexico) consists of the territorial area encompassed by the boundaries of the following jurisdictions or described area (including the territorial area of all municipalities (as defined in section 302(f) of the Clean Air Act, 42 U.S.C. 1857h(f)) geographically located within the outermost boundaries of the area so delimited):
In the State of New Mexico: Colfax County, Guadalupe County, Harding County, Mora County, San Miguel County, Torrance County, Union County.