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 Adair County, Oklahoma, and

Alfalfa County, Oklahoma, give the percentage contributions from specific air pollution sources.  The Adair County Seat is Stilwell, Oklahoma, and the Alfalfa County Seat is Cherokee, Oklahoma.