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

Douglas County, Oregon; Gilliam County, Oregon; and Grant County, Oregon.  The Douglas County Seat is Roseburg, Oregon; the Gilliam County Seat is Condon, Oregon; and the Grant County Seat is Canyon City, Oregon.