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Understanding the Pinal County Air Quality Impacts of the September 11, 2008 PM10 Natural Event

Explore the effects of the strong outflow winds on PM10 levels in Pinal County on September 11, 2008. Learn about the exceptional blowing dust event and its impact on air quality monitoring sites in the region.

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Understanding the Pinal County Air Quality Impacts of the September 11, 2008 PM10 Natural Event

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  1. Pinal County Air Quality September 11, 2008 PM10 Natural/Exceptional Event

  2. September 11, 2008 • Strong outflow winds associated with monsoon storm development caused significant areas of blowing dust. The Maximum winds reached 43 mph and five PCAQCD monitor exceeded the 24-hr PM10 NAAQS. PM10 24-hr Site AQS Site# Conc. (ug/m3) • PCH 04-021-3011(3) 217.1 • Casa Grande 04-021-0001(3) 202.5 • Combs 04-021-3009(3) 194.7 • Stanfield 04-021-3008(3) 178.2 • Maricopa 04-021-3010(3) 170.4

  3. Start of wall of dust formation

  4. Wall of dust moving East

  5. Wall of dust moving East

  6. Wall of dust moving East

  7. Wall of dust moving East

  8. Wall of dust moving East

  9. Wall of dust moving East

  10. Wall of dust moving East

  11. Wall of dust moving East

  12. Wall of dust moving East

  13. Wall of dust moving East

  14. Wall of dust moving East

  15. Wall of dust moving East

  16. Wall of dust moving East

  17. Wall of dust moving East

  18. Wall of dust moving East

  19. 9/11/08 “But for” Test • PCH (TEOM) had the following 24-hr PM10 concentrations before/after the 9/11/08 natural/exceptional event • 9/10/08 – 33.6 ug/m3 • 9/12/08 – 55.9 ug/m3 • Casa Grande • 9/10/08 - 25.4 ug/m3 • 9/12/08 – 49.0 ug/m3 • Combs • 9/10/08 - 79.5 ug/m3 • 9/12/08 – 75.3 ug/m3 • Stanfield • 9/10/08 - 31.4 ug/m3 • 9/12/08 – 55.1 ug/m3 • Maricopa • 9/10/08 - 30.8 ug/m3 • 9/12/08 – 60.6 ug/m3

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