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

Cheyenne County, Kansas; Clark County, Kansas; and Clay County, Kansas.  The Cheyenne County Seat is St. Francis, Kansas; the Clark County Seat is Ashland, Kansas; and the Clay County Seat is Clay Center, Kansas.