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 Fairbanks North Star Borough, Alaska, and

Haines Borough, Alaska, give the percentage contributions from specific air pollution sources.  The Fairbanks North Star Borough Seat is Fairbanks, Alaska, and the Haines Borough Seat is Haines, Alaska.