Air pollutant source characterization using the revised regional haze tracking metric and a photochemical grid model and implications for regional haze planning.

ABSTRACT: The 2017 revisions to the Regional Haze Rule clarify that visibility progress at Class I national parks and wilderness areas should be tracked on days with the highest anthropogenic contributions to haze (impairment). We compare the natural and anthropogenic contributions to haze in the western United States in 2011 estimated using the Environmental Protection Agency (EPA) recommended method and using model projections from the Comprehensive Air Quality Model with Extensions (CAMx) and the Particulate Source Apportionment Tool (PSAT). We do so because these two methods will be used by states to demonstrate visibility progress by 2028. If the two methods assume different natural and anthropogenic contributions, the projected benefits of reducing U.S. anthropogenic emissions will differ. The

SUBMITTER: Brewer P 

PROVIDER: S-EPMC7359743 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature