The Evansville (Indiana)-Owensboro-Henderson (Kentucky) Interstate Air Quality Control Region is revised to consist of the territorial area encompassed by the boundaries of the following jurisdictions (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 Kentucky: Daviess County, Hancock County, Henderson County, McLean County, Ohio County, Union County, Webster County.
In the State of Indiana: Dubois County, Gibson County, Perry County, Pike County, Posey County, Spencer County, Vanderburgh County, Warrick County.