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

Chouteau County, Montana; Custer County, Montana; and Daniels County, Montana.  The Chouteau County Seat is Fort Benton, Montana; the Custer County Seat is Miles City, Montana; and the Daniels County Seat is Scobey, Montana.