Abstract: The Environmental Protection Agency (EPA) compiles data on emission tonnages of air pollutants for US counties.  US Air Quality Gradebook ("AirGrades") source sheets such as this one for Wilson County, Texas, and

Winkler County, Texas, give the percentage contributions from specific air pollution sources.  The Wilson County Seat is Floresville, Texas, and the Winkler County Seat is Kermit, Texas.