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 Lamb County, Texas, and

Lampasas County, Texas, give the percentage contributions from specific air pollution sources.  The Lamb County Seat is Littlefield, Texas, and the Lampasas County Seat is Lampasas, Texas.