Abstract: The Environmental Protection Agency (EPA) compiles data on emission tonnages of air pollutants for US counties.  US Air Quality Gradebook ("AirGrades") source sheets such as this one for Teller County, Colorado, and

Washington County, Colorado, give the percentage contributions from specific air pollution sources.  The Teller County Seat is Cripple Creek, Colorado, and the Washington County Seat is Akron, Colorado.