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

Brown County, South Dakota; Brule County, South Dakota; and Buffalo County, South Dakota.  The Brown County Seat is Aberdeen, South Dakota; the Brule County Seat is Chamberlain, South Dakota; and the Buffalo County Seat is Gann Valley, South Dakota.