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

Twin Falls County, Idaho; Valley County, Idaho; and Washington County, Idaho.  The Twin Falls County Seat is Twin Falls, Idaho; the Valley County Seat is Cascade, Idaho; and the Washington County Seat is Weiser, Idaho.