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 Cabell County, West Virginia, and

Calhoun County, West Virginia, give the percentage contributions from specific air pollution sources.  The Cabell County Seat is Huntington, West Virginia, and the Calhoun County Seat is Grantsville, West Virginia.