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 Benton County, Missouri, and

Bollinger County, Missouri, give the percentage contributions from specific air pollution sources.  The Benton County Seat is Warsaw, Missouri, and the Bollinger County Seat is Marble Hill, Missouri.