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 Linn County, Oregon, and

Malheur County, Oregon, give the percentage contributions from specific air pollution sources.  The Linn County Seat is Albany, Oregon, and the Malheur County Seat is Vale, Oregon.