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 Goodhue County, Minnesota, and

Grant County, Minnesota, give the percentage contributions from specific air pollution sources.  The Goodhue County Seat is Red Wing, Minnesota, and the Grant County Seat is Elbow Lake, Minnesota.