81.214—Black Hills-Rapid City Intrastate Air Quality Control Region.
The Rapid City Intrastate Air Quality Control Region (South Dakota) has been renamed the Black Hills-Rapid City Intrastate Air Quality Control Region (South Dakota) and 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 South Dakota: Butte County, Custer County, Fall River County, Lawrence County, Meade County, Pennington County.