Assessment of Modeled Changes in Air Quality and Deposition Arising from Hypothetical
Reductions in Anthropogenic Emissions over the Eastern US

Kevin Civerolo, Winston Hao, and Gopal Sistla
New York State Department of Environmental Conservation Division of Air Resources
625 Broadway, 2nd Floor Albany, NY 12233-3259


In order to examine the effects of anthropogenic emissions on ambient ozone concentrations and nitrogen deposition across the eastern US, we performed sensitivity studies using the EPA Community Multiscale Air Quality (CMAQ) model. The model simulations covered an extended period (53 days) during the summer of 2002. In one simulation mobile source emissions were removed, and in the other all EGU and non-EGU point sources were removed. In terms of ozone concentrations, the greatest impacts of mobile sources were apparent in the southeastern US from Atlanta to North Carolina, as well as along the northeastern urban corridor. The greatest impacts of point sources followed the Ohio River Valley. The results were similar for N deposition, except that the effects of mobile source emissions in the southeastern US were not nearly as pronounced. These results suggest that effective air quality management may require different emissions strategies for different regions of the country.