The El Paso-Las Cruces-Alamogordo Interstate Air Quality Control Region (New Mexico-Texas) is revised to consist 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 Texas: Brewster County, Culberson County, El Paso County, Hudspeth County, Jeff Davis County, Presidio County.
In the State of New Mexico: Dona Ana County, Lincoln County, Otero County, Sierra County.