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 Osage County, Missouri, and

Ozark County, Missouri, give the percentage contributions from specific air pollution sources.  The Osage County Seat is Linn, Missouri, and the Ozark County Seat is Gainesville, Missouri.