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 Pratt County, Kansas, and

Rawlins County, Kansas, give the percentage contributions from specific air pollution sources.  The Pratt County Seat is Pratt, Kansas, and the Rawlins County Seat is Atwood, Kansas.