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Pinal County Air Quality

Pinal County Air Quality. August 16, 2007 PM 10 Exceptional Event. August 16, 2007. Strong winds associated with monsoon activity that developed from east to west over the county on August 16th. Max winds reached 39 mph which caused five 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 16, 2007 PM10 Exceptional Event

  2. August 16, 2007 • Strong winds associated with monsoon activity that developed from east to west over the county on August 16th. Max winds reached 39 mph which caused five PCAQCD monitors to exceed the 24-hr PM10 NAAQS. Site 24-hr PM10 Conc. (ug/m3) Combs 969.5 Maricopa 249.4 Stanfield (47 mm filter) 247.9 PCH 184.4 Casa Grande 163.6 * August 16, 2007 also flagged by ADEQ as an exceptional event.

  3. FXUS65 KTWC 161546 AFDTWC AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 845 AM MST THU AUG 16 2007 .SYNOPSIS...SEVERAL WEAK UPPER LEVEL DISTURBANCES...ONE OVER NEW MEXICO...AND A COUPLE MOVING NORTH FROM SONORA...WILL ENHANCE THUNDERSTORM INTENSITY THIS AFTERNOON AND PERHAPS ON FRIDAY AS PLENTIFUL MONSOON MOISTURE REMAINS OVER THE REGION. && .DISCUSSION...AFTER A DOWN DAY WED...IT LOOKS LIKE WE MAY BE IN FOR AN UPTURN THIS AFTERNOON/EVENING...PARTICULARLY FROM KTUS WEST.

  4. 4 p.m. local time Cells developed to the east of the county and moved through during the evening of 8/16/07 which provided the wind that caused the elevated PM10 in Pinal County

  5. 5 p.m. local time Cells developed to the east of the county and moved through during the evening of 8/16/07 which provided the wind that caused the elevated PM10 in Pinal County

  6. 6 p.m. local time Cells developed to the east of the county and moved through during the evening of 8/16/07 which provided the wind that caused the elevated PM10 in Pinal County

  7. 3 p.m. local time

  8. 3:16 p.m. local time

  9. 3:30 p.m. local time

  10. 3:46 p.m. local time

  11. 4:00 p.m. local time

  12. 4:16 p.m. local time

  13. 4:30 p.m. local time

  14. 4:46 p.m. local time

  15. 8/16/07 “But for” Test • Had it not been “but for” the high winds between 5-7 p.m. associated with the cell development from east to west over the county which caused Combs to have a 1-hr PM10 concentration of 21,035 ug/m3, Combs would have NOT exceeded the PM10 24-hr NAAQS. • If the 21,035 ug/m3 was replaced with the average of the other 23 hours then the 24-hr PM10 concentration would be 97 ug/m3 • Maricopa – 107 ug/m3 • PCH – 96 ug/m3 • Casa Grande – 101 ug/m3

  16. Additional 8/16/07 “But for” Test • Combs had the following 24-hr PM10 concentrations before/after the 8/16/07 event • 8/15/07 – 64.8 ug/m3 • 8/17/07 – 130.8 ug/m3 • Maricopa • 8/15/07 – 52.8 ug/m3 • 8/17/07 – 61.7 ug/m3 • PCH • 8/15/07 – 43.4 ug/m3 • 8/17/07 – 71.5 ug/m3 • Casa Grande • 8/15/07 – 43.7 ug/m3 • 8/17/07 – 48.8 ug/m3

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