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 Ohio County, West Virginia, and

Pendleton County, West Virginia, give the percentage contributions from specific air pollution sources.  The Ohio County Seat is Wheeling, West Virginia, and the Pendleton County Seat is Franklin, West Virginia.