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 Livingston County, Missouri, and

Macon County, Missouri, give the percentage contributions from specific air pollution sources.  The Livingston County Seat is Chillicothe, Missouri, and the Macon County Seat is Macon, Missouri.