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 Chase County, Kansas, and

Chautauqua County, Kansas, give the percentage contributions from specific air pollution sources.  The Chase County Seat is Cottonwood Falls, Kansas, and the Chautauqua County Seat is Sedan, Kansas.