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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 Howard County, Texas, and |
Hudspeth County, Texas, give the percentage contributions from specific air pollution sources. The Howard County Seat is Big Spring, Texas, and the Hudspeth County Seat is Sierra Blanca, Texas. |