Technique to Sulfur Attribution for the Big Bend Regional Aerosol and Visibility Observational Study

Coahuila, Mexico, are the largest sources of SO2 emissions in the area near Big Bend National Park. There has been concern that these plants contribute much of the haze at the park. Our analysis indicates that local sources (such as the Carbon plants) contributed a majority of SO*, but only a small fraction (approximately 10%) of the particulate S04’-, on average, in the vicinity of Big Bend during the BRAVO study. Emissions reductions from more distant regional sources and from the Carbon plants are needed to sub-stantially reduce particulate S and improve visibility at Bi