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

Shannon County, South Dakota; Spink County, South Dakota; and Stanley County, South Dakota.  The Shannon County Seat is Hot Springs, South Dakota; the Spink County Seat is Redfield, South Dakota; and the Stanley County Seat is Fort Pierre, South Dakota.