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      Additional Benefits of Federal Air-Quality Rules: Model Estimates of Controllable Biogenic Secondary Organic Aerosol

      1 , 2 , 3 , 4

      Environmental Science & Technology

      American Chemical Society (ACS)

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          <p class="first" id="P1">Atmospheric models that accurately describe the fate and transport of trace species for the right reasons aid in development of effective air quality management strategies that safeguard human health, in particular to mitigate the impacts of fine particulate matter (PM <sub>2.5</sub>). Controllable emissions from human activity facilitate formation of biogenic secondary organic aerosol (BSOA) to enhance the atmospheric PM <sub>2.5</sub> burden. Previous modeling with EPA’s Community Multiscale Air Quality (CMAQ) model predicted that anthropogenic primary organic aerosol (POA) emissions had the greatest impact on BSOA. Those experiments included formation processes from semi-volatile partitioning, but not interactions with aerosol liquid water (ALW), a ubiquitous PM constituent that modulates BSOA. We conduct 17 CMAQ summertime simulations with updated chemistry and evaluate changes in predicted BSOA mass due to removal of individual pollutants and source sectors from model inputs for the continental U.S. Among individual sectors, CMAQ predicts that SO <sub>2</sub> emissions from electricity generating point sources and mobile source NO <sub>x</sub> emissions have the largest impact on BSOA. Removal of anthropogenic NO <sub>x</sub>, SO <sub>2</sub> and POA emissions during the simulated summertime period reduces nationally averaged BSOA by 23%, 14% and 8%, and PM <sub>2.5</sub> by 9.2%, 14% and 5.3% respectively. CMAQ-predicted ALW mass concentrations decrease by 10% and 35% in response to removal of <span style="font-variant: small-caps">NO</span> <sub>x</sub> and SO <sub>2</sub> emissions. This work contributes to the understanding of ancillary benefits of existing and planned Federal <span style="font-variant: small-caps">NO</span> <sub>x</sub> and SO <sub>2</sub> air quality rules through concurrent reductions in organic PM <sub>2.5</sub> mass. </p>

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          Author and article information

          Environmental Science & Technology
          Environ. Sci. Technol.
          American Chemical Society (ACS)
          July 30 2018
          July 30 2018
          [1 ]Department of Chemistry, University of California, Irvine, California 92697, United States
          [2 ]Office of Research and Development, U.S. EPA, Research Triangle Park, North Carolina 27709, United States
          [3 ]Office of Air Quality Planning and Standards, U.S. EPA, Research Triangle Park, North Carolina 27709, United States
          [4 ]Department of Chemical, Biochemical and Environmental Engineering, University of Maryland, Baltimore County, Maryland 21250, United States
          © 2018


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