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 Scurry County, Texas, and

Shackelford County, Texas, give the percentage contributions from specific air pollution sources.  The Scurry County Seat is Snyder, Texas, and the Shackelford County Seat is Albany, Texas.