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

Cavalier County, North Dakota; Dickey County, North Dakota; and Divide County, North Dakota.  The Cavalier County Seat is Langdon, North Dakota; the Dickey County Seat is Ellendale, North Dakota; and the Divide County Seat is Crosby, North Dakota.