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

Adams County, North Dakota; Barnes County, North Dakota; and Benson County, North Dakota.  The Adams County Seat is Hettinger, North Dakota; the Barnes County Seat is Valley City, North Dakota; and the Benson County Seat is Minnewauken, North Dakota.