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Pinal County Air Quality Exceptional Event Report

Report on October 27, 2008, exceptional PM10 event due to strong pressure gradient causing blowing dust. High pressure and back door cold front led to exceeded NAAQS levels. Monitor data and observations analyzed.

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Pinal County Air Quality Exceptional Event Report

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  1. Pinal County Air Quality October 27, 2008 PM10 Exceptional/Natural Event

  2. October 27, 2008 • Winds associated with abnormally tight pressure gradient caused by high pressure and a back door cold front to the east. The tight pressure gradient caused significant areas of blowing dust. The Maximum winds reached 28 mph and three PCAQCD monitors exceeded the 24-hr PM10 NAAQS. PM10 24-hr Site AQS Site# Conc. (ug/m3) • Stanfield 04-021-3008(3) 212.6 • Stanfield 04-021-3008(1) 201.0 • Maricopa 04-021-3010(3) 159.4

  3. Strong high pressure & “back door” cold front Result in a strong pressure gradient

  4. NOTE: Stanfield had 2 invalid hours at 1 and 2 pm.

  5. Casa Grande Airport NWS Observations Sustained wind speed/gust & Visibility

  6. 10/27/08 “But for” Test • Stanfield (TEOM) had the following 24-hr PM10 concentrations before/after the 10/27/08 exceptional/natural event • 10/26/08 – 86.2 ug/m3 • 10/28/08 – 87.8 ug/m3 • Maricopa (TEOM) had the following 24-hr PM10 concentrations before/after the 10/27/08 exceptional/natural event • 10/26/08 – 84.0 ug/m3 • 10/28/08 – 72.6 ug/m3

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