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

Grant County, Oklahoma; Greer County, Oklahoma; and Harmon County, Oklahoma.  The Grant County Seat is Medford, Oklahoma; the Greer County Seat is Mangum, Oklahoma; and the Harmon County Seat is Hollis, Oklahoma.