40 C.F.R. § 81.58
The Columbus (Georgia)-Phenix City (Alabama) Interstate Air Quality Control Region has been 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 Alabama: Autauga County, Bullock County, Butler County, Crenshaw County, Elmore County, Lee County, Lowndes County, Macon County, Montgomery County, Pike County, Russell County.
In the State of Georgia: Chattahoochee County, Dooly County, Harris County, Marion County, Muscogee County, Quitman County, Schley County, Stewart County, Sumter County, Talbot County, Taylor County, Webster County.
40 C.F.R. §81.58