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

Albany County, Wyoming; Big Horn County, Wyoming; and Campbell County, Wyoming.  The Albany County Seat is Laramie, Wyoming; the Big Horn County Seat is Basin, Wyoming; and the Campbell County Seat is Gillette, Wyoming.