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 Chilton County, Alabama, and

Choctaw County, Alabama, give the percentage contributions from specific air pollution sources.  The Chilton County Seat is Clanton, Alabama, and the Choctaw County Seat is Butler, Alabama.