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

Billings County, North Dakota; Bottineau County, North Dakota; and Bowman County, North Dakota.  The Billings County Seat is Medora, North Dakota; the Bottineau County Seat is Bottineau, North Dakota; and the Bowman County Seat is Bowman, North Dakota.