The Northwest Kansas Intrastate Air Quality Control Region 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 Kansas: Barton County, Cheyenne County, Decatur County, Ellis County, Gove County, Graham County, Logan County, Ness County, Norton County, Osborne County, Phillips County, Rawlins County, Rooks County, Rush County, Russell County, Sheridan County, Sherman County, Smith County, Thomas County, Trego County, Wallace County.