Abstract: The Environmental Protection Agency (EPA) compiles data on emission tonnages of air pollutants for US counties.  US Air Quality Gradebook ("AirGrades") source sheets give the percentage contributions from specific air pollution sources.  This source sheet is for

Butte County, South Dakota; Campbell County, South Dakota; and Charles Mix County, South Dakota.  The Butte County Seat is Belle Fourche, South Dakota; the Campbell County Seat is Mound City, South Dakota; and the Charles Mix County Seat is Lake Andes, South Dakota.