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

Marion County, Texas; Martin County, Texas; and Mason County, Texas.  The Marion County Seat is Jefferson, Texas; the Martin County Seat is Stanton, Texas; and the Mason County Seat is Mason, Texas.