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

Lincoln County, South Dakota; Lyman County, South Dakota; and Marshall County, South Dakota.  The Lincoln County Seat is Canton, South Dakota; the Lyman County Seat is Kennebec, South Dakota; and the Marshall County Seat is Britton, South Dakota.