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 Hertford County, North Carolina, and

Hoke County, North Carolina, give the percentage contributions from specific air pollution sources.  The Hertford County Seat is Winton, North Carolina, and the Hoke County Seat is Raeford, North Carolina.