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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 Alcona County, Michigan, and |
Alger County, Michigan, give the percentage contributions from specific air pollution sources. The Alcona County Seat is Harrisville, Michigan, and the Alger County Seat is Munising, Michigan. |