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Pinal County Air Quality

Pinal County Air Quality. June 6, 2007 PM 10 Exceptional Event. June 6, 2007. Strong winds associated with a front helped transport dust from areas outside of the county. Max winds reached 28 mph which caused four PCAQCD monitors to exceed the 24-hr PM 10 NAAQS.

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Pinal County Air Quality

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  1. Pinal County Air Quality June 6, 2007 PM10 Exceptional Event

  2. June 6, 2007 • Strong winds associated with a front helped transport dust from areas outside of the county. Max winds reached 28 mph which caused four PCAQCD monitors to exceed the 24-hr PM10 NAAQS. Site 24-hr PM10 Conc. (ug/m3) PCH 414.2 Combs 360.5 Stanfield 273.4 Maricopa 213.4 * June 6, 2007 also flagged by ADEQ as an exceptional event.

  3. Pinal County Started an AQI forecasting program around June 1, 2007. Typically, the “Today” AQI is a carry forward forecast from the previous day since the PM10 TEOM data isn’t provided throughout the day. The AQI forecasting effort is rather new and we err on the conservatively high side of the forecast, therefore the 6/5/07 PM10 exceedance didn’t verify. However The 6/6/07 AQI forecast did verify. The daily AQI forecast is on the web at http://co.pinal.az.us/AirQual/pdf/forecast/aqforecast.pdf

  4. 5 a.m. local time

  5. 6 a.m. local time

  6. 7 a.m. local time

  7. 8 a.m. local time

  8. 9 a.m. local time

  9. 10 a.m. local time

  10. 11 a.m. local time

  11. Noon local time

  12. 1 p.m. local time

  13. 2 p.m. local time

  14. 3 p.m. local time

  15. 4 p.m. local time

  16. 5 p.m. local time

  17. 6 p.m. local time

  18. 6/6/07 “But for” Test • PCH had the following 24-hr PM10 concentrations before/after the 6/6/07 event • 6/5/07 – 101.1 ug/m3 • 6/7/07 – 98.7 ug/m3 • Combs • 6/5/07 – 113.7 ug/m3 • 6/7/07 – 106.9 ug/m3 • Stanfield • 6/5/07 – 129.9 ug/m3 • 6/7/07 – 136.2 ug/m3 • Maricopa • 6/5/07 – 126.8 ug/m3 • 6/7/07 – 101.3 ug/m3 NOTE: The winds may have not been As strong as other previously noted Exceedance days. However the seasonal PM10 “background” at this time of year is significantly higher and therefore Doesn’t take much wind to exceed the PM10 NAAQS. As a Result had it not been (i.e. “but for”) for this atypical* frontal passage (i.e. exceptional) these monitors would NOT have exceeded the PM10 NAAQS. • *Source: http://www.hpc.ncep.noaa.gov/dailywxmap/ • Only frontal passage for June 2007. No frontal • Passages for June 2006 as a comparison.

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