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 DeBaca County, New Mexico, and

Dona Ana County, New Mexico, give the percentage contributions from specific air pollution sources.  The DeBaca County Seat is Fort Sumner, New Mexico, and the Dona Ana County Seat is Las Cruces, New Mexico.