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Pinal County Air Quality

Pinal County Air Quality. August 13, 2007 PM 10 Exceptional Event. August 13, 2007. Strong winds associated with monsoon cells that developed over the county late on August 13th. Max winds reached 32 mph which caused three 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 August 13, 2007 PM10 Exceptional Event

  2. August 13, 2007 • Strong winds associated with monsoon cells that developed over the county late on August 13th. Max winds reached 32 mph which caused three PCAQCD monitors to exceed the 24-hr PM10 NAAQS. Site 24-hr PM10 Conc. (ug/m3) Maricopa 331.7 Combs 248.4 PCH 202.6 * August 13, 2007 also flagged by ADEQ as an exceptional event.

  3. 5 p.m. local time Cells developed to the south and east of the county and moved through during the evening of 8/13/07 which provided the wind that caused the elevated PM10 in Pinal County

  4. 6 p.m. local time Cells developed to the south and east of the county and moved through during the evening of 8/13/07 which provided the wind that caused the elevated PM10 in Pinal County

  5. 7 p.m. local time Cells developed to the south and east of the county and moved through during the evening of 8/13/07 which provided the wind that caused the elevated PM10 in Pinal County

  6. 8 p.m. local time Cells developed to the south and east of the county and moved through during the evening of 8/13/07 which provided the wind that caused the elevated PM10 in Pinal County

  7. 9 p.m. local time Cells developed to the south and east of the county and moved through during the evening of 8/13/07 which provided the wind that caused the elevated PM10 in Pinal County

  8. 10 p.m. local time Cells developed to the south and east of the county and moved through during the evening of 8/13/07 which provided the wind that caused the elevated PM10 in Pinal County

  9. 11 p.m. local time Cells developed to the south and east of the county and moved through during the evening of 8/13/07 which provided the wind that caused the elevated PM10 in Pinal County

  10. 8/13/07 “But for” Test • Had it not been “but for” the high winds between 10-11 p.m. associated with the cell development from east to west over the county which caused Maricopa to have a 1-hr PM10 concentration of 6,365 ug/m3, Maricopa would have NOT exceeded the PM10 24-hr NAAQS. • If the 6,365 ug/m3 was replaced with the average of the other 23 hours then the 24-hr PM10 concentration would be 69 ug/m3 • PCH – 50 ug/m3 • Combs* – 85 ug/m3 * Substituted 2 highest hours caused by the high winds with average of other 22 hours.

  11. Additional 8/13/07 “But for” Test • Maricopa had the following 24-hr PM10 concentrations before/after the 8/13/07 event • 8/12/07 – 44.2 ug/m3 • 8/14/07 – 28.9 ug/m3 • Combs • 8/12/07 – 59.9 ug/m3 • 8/14/07 – 72.0 ug/m3 • PCH • 8/12/07 – 50.1 ug/m3 • 8/14/07 – 26.8 ug/m3

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