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

McHenry County, North Dakota; McIntosh County, North Dakota; and McKenzie County, North Dakota.  The McHenry County Seat is Towner, North Dakota; the McIntosh County Seat is Ashley, North Dakota; and the McKenzie County Seat is Watford City, North Dakota.