Abstract: The Environmental Protection Agency (EPA) compiles data on emission tonnages of air pollutants for US counties.  US Air Quality Gradebook ("AirGrades") source sheets give the percentage contributions from specific air pollution sources.  This source sheet is for

Clearwater County, Minnesota; Cook County, Minnesota; and Cottonwood County, Minnesota.  The Clearwater County Seat is Bagley, Minnesota; the Cook County Seat is Grand Marais, Minnesota; and the Cottonwood County Seat is Windom, Minnesota.