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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 Washington County, Minnesota, and |
Watonwan County, Minnesota, give the percentage contributions from specific air pollution sources. The Washington County Seat is Stillwater, Minnesota, and the Watonwan County Seat is Saint James, Minnesota. |