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

Upton County, Texas; Uvalde County, Texas; and Val Verde County, Texas.  The Upton County Seat is Rankin, Texas; the Uvalde County Seat is Uvalde, Texas; and the Val Verde County Seat is Del Rio, Texas.