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Pinal County Air Quality

On August 29, 2007, Pinal County experienced strong winds, reaching up to 46 mph, linked to monsoon activity. These winds caused significant PM10 concentrations to exceed the 24-hour NAAQS at two PCAQCD monitoring sites. The Ponderosa Campground site recorded a 1-hour PM10 concentration of 5,004 µg/m³ due to these winds, while the average PM10 concentration for the other 23 hours would have been 47 µg/m³. The site at Stanfield also exhibited increased PM10 levels surrounding this exceptional event.

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Pinal County Air Quality

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  1. Pinal County Air Quality August 29, 2007 PM10 Exceptional Event

  2. August 29, 2007 • Strong winds associated with monsoon activity that developed over eastern portions of the county on August 29th. Max winds reached 46 mph which caused two PCAQCD monitors to exceed the 24-hr PM10 NAAQS. Site 24-hr PM10 Conc. (ug/m3) PCH 253.9 Stanfield 159.4

  3. Location of Stanfield monitor Location of PCH monitor 9 p.m. 8/28/07 to 8 p.m. 8/29/07 local time

  4. Location of PCH monitor

  5. Location of PCH monitor

  6. Location of PCH monitor

  7. Location of PCH monitor

  8. Location of PCH monitor

  9. Location of PCH monitor

  10. Location of PCH monitor

  11. Location of PCH monitor

  12. Location of PCH monitor

  13. Location of PCH monitor

  14. Location of PCH monitor

  15. Location of PCH monitor

  16. Location of PCH monitor

  17. Location of PCH monitor

  18. Location of PCH monitor

  19. Location of PCH monitor

  20. Location of PCH monitor

  21. Location of PCH monitor

  22. Location of PCH monitor

  23. Location of PCH monitor

  24. 8/29/07 “But for” Test • Had it not been “but for” the high winds between 7-9 p.m. associated with the cell development in the county that caused PCH to have a 1-hr PM10 concentration of 5,004 ug/m3, PCH would have NOT exceeded the PM10 24-hr NAAQS. • If the 5,004 ug/m3 was replaced with the average of the other 23 hours then the 24-hr PM10 concentration would be 47 ug/m3 • Stanfield (Avg. of other 22 hrs) - 74 ug/m3

  25. Additional 8/29/07 “But for” Test • PCH had the following 24-hr PM10 concentrations before/after the 8/29/07 event • 8/28/07 – 43.2 ug/m3 • 8/30/07 – 45.8 ug/m3 • Stanfield • 8/28/07 – 48.2 ug/m3 • 8/30/07 – 56.8 ug/m3

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