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 Ritchie County, West Virginia, and

Roane County, West Virginia, give the percentage contributions from specific air pollution sources.  The Ritchie County Seat is Harrisville, West Virginia, and the Roane County Seat is Spencer, West Virginia.