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

Harding County, South Dakota; Hughes County, South Dakota; and Hutchinson County, South Dakota.  The Harding County Seat is Buffalo, South Dakota; the Hughes County Seat is Pierre, South Dakota; and the Hutchinson County Seat is Olivet, South Dakota.