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 Alachua County, Florida, and

Baker County, Florida, give the percentage contributions from specific air pollution sources.  The Alachua County Seat is Gainesville, Florida, and the Baker County Seat is Macclenny, Florida.