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To what extent can biogenic SOA be controlled?

Annmarie G Carlton1, Robert W Pinder, Prakash V Bhave

  • 1U.S. Environmental Protection Agency, Office of Research and Development, National Exposure Research Laboratory, North Carolina 27711, USA. carlton.annmarie@epa.gov

Environmental Science & Technology
|April 15, 2010
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Controlling anthropogenic pollution can significantly reduce biogenic secondary organic aerosol (SOA). This study shows over 50% of biogenic SOA in the eastern U.S. is controllable by managing human-caused emissions.

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Area of Science:

  • Atmospheric Chemistry
  • Air Quality Management
  • Environmental Science

Background:

  • Biogenic secondary organic aerosol (SOA) is often assumed to be uncontrollable.
  • Anthropogenic pollution can enhance the formation of biogenic SOA from natural volatile organic compounds (VOCs).

Purpose of the Study:

  • To quantify the controllable fraction of biogenic SOA.
  • To assess the impact of anthropogenic emissions on biogenic SOA concentrations.

Main Methods:

  • Utilized 3-dimensional photochemical air quality modeling (CMAQ).
  • Conducted 22 simulations over the continental U.S. during August-September 2003.
  • Estimated pollutant contributions by removing anthropogenic emissions (NOx, NH3, SOx, RNMC, PCM) individually and combined.

Main Results:

  • Anthropogenic emissions strongly influence predicted biogenic SOA concentrations.
  • Over 50% of biogenic SOA in the eastern U.S. was found to be controllable.
  • Biogenic SOA formation is significantly enhanced by controllable anthropogenic emissions.

Conclusions:

  • The classification of SOA solely by VOC origin is insufficient to determine its controllable fraction.
  • Effective air quality management requires considering the anthropogenic influence on biogenic SOA.
  • Controlling anthropogenic pollutants offers a viable strategy for reducing biogenic SOA levels.