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 Pickett County, Tennessee, and

Polk County, Tennessee, give the percentage contributions from specific air pollution sources.  The Pickett County Seat is Byrdstown, Tennessee, and the Polk County Seat is Benton, Tennessee.