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Windblown dust contributes to high PM2.5 concentrations.

C S Claiborn1, D Finn, T V Larson

  • 1Department of Civil & Environmental Engineering, Washington State University, Pullman, USA.

Journal of the Air & Waste Management Association (1995)
|September 26, 2000
PubMed
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Fine particulate matter (PM2.5) measurements can be affected by coarse particles in arid regions. Windblown dust events significantly increase PM2.5 and the coarse fraction within it.

Area of Science:

  • Environmental Science
  • Atmospheric Science
  • Air Quality Monitoring

Background:

  • National Ambient Air Quality Standards for PM rely on PM2.5 mass measurements.
  • Arid and semi-arid regions may experience coarse particle intrusion into PM2.5 data.
  • Understanding particulate matter composition during dust events is crucial for accurate air quality assessment.

Purpose of the Study:

  • To investigate the impact of windblown dust events on particulate matter size distributions in Spokane, WA.
  • To quantify the contribution of coarse particles to PM2.5 during dust events.
  • To differentiate the impact of local versus long-range transported dust on PM measurements.

Main Methods:

  • Continuous monitoring of PM10, PM2.5, and PM1.0 concentrations.

Related Experiment Videos

  • Analysis of data during multiple windblown dust events and non-dusty periods.
  • Characterization of particulate matter size fractions, particularly the 1.0-2.5 micron range.

    • Main Results:

    • PM2.5 constituted a lower percentage of PM10 during dust events (30%) compared to non-dusty days (48%).
    • Both PM10 and PM2.5 levels were elevated during local dust events, while PM1.0 was not.
    • The 1.0-2.5 micron size range (intermodal region) was a larger fraction of PM2.5 during dust events (51%) versus non-dusty days (28%).

    Conclusions:

    • Windblown dust events significantly alter the composition of PM2.5, increasing the contribution of larger particles.
    • Local dust storms primarily impact PM10 and PM2.5, with less effect on PM1.0.
    • Accurate interpretation of PM2.5 requires consideration of coarse particle intrusion, especially in arid regions and during dust events.