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 Wabash County, Illinois, and

Warren County, Illinois, give the percentage contributions from specific air pollution sources.  The Wabash County Seat is Mount Carmel, Illinois, and the Warren County Seat is Monmouth, Illinois.