Abstract: The Environmental Protection Agency (EPA) compiles data on emission tonnages of air pollutants for US counties.  US Air Quality Gradebook ("AirGrades") source sheets such as this one for Currituck County, North Carolina, and

Dare County, North Carolina, give the percentage contributions from specific air pollution sources.  The Currituck County Seat is Currituck, North Carolina, and the Dare County Seat is Manteo, North Carolina.