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

Potter County, Texas; Presidio County, Texas; and Rains County, Texas.  The Potter County Seat is Amarillo, Texas; the Presidio County Seat is Marfa, Texas; and the Rains County Seat is Emory, Texas.