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

McCone County, Montana; Meagher County, Montana; and Mineral County, Montana.  The McCone County Seat is Circle, Montana; the Meagher County Seat is White Sulphur Springs, Montana; and the Mineral County Seat is Superior, Montana.