Application of health information to hazardous air pollutants modeled in EPA's Cumulative Exposure Project.

摘要: Relatively little is known about the spectrum of health effects, and scope level ambient air concentrations those pollutants regulated under Clean Air Act as "hazardous pollutants". The U.S. Environmental Protection Agency's (USEPA) Cumulative Exposure Project uses currently available emissions inventories, from a variety source types, an atmospheric dispersion model to provide estimates for 148 hazardous (HAPs) in over 60,000 census tracts year 1990. This paper hazard information provides database potential regulatory threshold concern, or "benchmark concentrations," methodology prioritizing characterizing quality data. In order demonstrate application prioritization scheme outputs Project, comparisons were made with maximum modeled concentration each individual pollutant across tracts. Of 197 benchmark cancer non-cancer (long- short-term exposures) effects compiled study, approximately one half exceeded predominance exceedance benchmarks. While number fully characterize these was limited (approximately 80 percent HAPs identified concerns had 50 all concentrations) there greater uncertainty derivation than other levels, comparison between two useful approach providing indication public concern pollutants.