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

Cherry County, Nebraska; Cheyenne County, Nebraska; and Clay County, Nebraska.  The Cherry County Seat is Valentine, Nebraska; the Cheyenne County Seat is Sidney, Nebraska; and the Clay County Seat is Clay Center, Nebraska.