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

Sargent County, North Dakota; Sheridan County, North Dakota; and Sioux County, North Dakota.  The Sargent County Seat is Forman, North Dakota; the Sheridan County Seat is McClusky, North Dakota; and the Sioux County Seat is Fort Yates, North Dakota.