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Source apportionment of fine particles in Tennessee using a source-oriented model.

Prakash Doraiswamy1, Wayne T Davis, Terry L Miller

  • 1Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, TN 37996, USA.

Journal of the Air & Waste Management Association (1995)
|April 27, 2007
PubMed
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This study quantifies primary and secondary fine particle (PM2.5) sources in Tennessee using air quality modeling. It identifies on-road mobile sources and coal-fired power plants as major contributors to PM2.5 concentrations.

Area of Science:

  • Environmental Science
  • Atmospheric Chemistry
  • Air Quality Modeling

Background:

  • Particulate matter (PM2.5) source apportionment is crucial for identifying pollution origins.
  • Existing receptor models often neglect chemical reactions forming secondary PM2.5.
  • Secondary PM2.5 originates from precursor gases like sulfur dioxide, nitrogen oxides, and volatile organic compounds.

Purpose of the Study:

  • To develop a comprehensive source apportionment model for primary and secondary PM2.5.
  • To quantify the contributions of major source categories to PM2.5 concentrations in Tennessee.
  • To inform policy decisions for PM2.5 National Ambient Air Quality Standards compliance.

Main Methods:

  • Utilized the U.S. EPA Models3/Community Multi-Scale Air Quality (CMAQ) modeling system.

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  • Employed a nested modeling domain with resolutions of 36, 12, and 4 km, covering Tennessee at 4 km.
  • Compiled emission inventories for 1999, including on-road mobile and point sources for Tennessee and surrounding states.

    • Main Results:

    • Modeled PM2.5 concentrations for the episode from August 29 to September 9, 1999.
    • Quantified the impact of on-road mobile sources, including fugitive dust, on PM2.5 levels.
    • Assessed the contribution of coal-fired power plants to observed PM2.5 concentrations.

    Conclusions:

    • The modeling approach successfully estimated primary and secondary PM2.5 contributions.
    • On-road mobile sources and coal-fired power plants are significant contributors to Tennessee's PM2.5.
    • Findings support the development of targeted control strategies for air quality management.