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

Travis County, Texas; Trinity County, Texas; and Tyler County, Texas.  The Travis County Seat is Austin, Texas; the Trinity County Seat is Groveton, Texas; and the Tyler County Seat is Woodville, Texas.