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

Bexar County, Texas; Blanco County, Texas; and Borden County, Texas.  The Bexar County Seat is San Antonio, Texas; the Blanco County Seat is Johnson City, Texas; and the Borden County Seat is Gail, Texas.