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 Angelina County, Texas, and

Aransas County, Texas, give the percentage contributions from specific air pollution sources.  The Angelina County Seat is Lufkin, Texas, and the Aransas County Seat is Rockport, Texas.