[ADEQ Forecasts] ADEQ Daily Air Quality Forecast - Thursday, September 22, 2011

Wed Sep 21 11:35:13 MST 2011

Health message for Wednesday, September 21: Unusually Sensitive People
should consider limiting prolonged exertion outdoors.

Health message for Thursday, September 22: Unusually Sensitive People
should consider limiting prolonged exertion outdoors.

Synopsis and Discussion
Little change is expected with the weather and air quality today and
Thursday.  High pressure will keep the heat on, making the first day of
Fall feel more like and early summer day.  A few clouds are expected to
move in late Friday through Sunday.  This will provide the Valley of the
Sun with a bit of shade.  There is even a very slim chance for a stray
showers or thunderstorm Saturday.  That means the possibility exists for
some blowing dust from distant storms.  Hopefully that won't happen.

Ozone levels reached the lower to middle part of the moderate range on
Tuesday, with the highest levels once again in Cave Creek and Humboldt
Mountain (71 and 74 AQI, respectively).  Early morning readings today
suggest similar levels are likely for Wednesday and probably Thursday as

An isolated incident occurred near the West Phoenix monitor between 7
and 9pm last night that sent PM10 and PM2.5 concentrations very high.
Though not confirmed, it's possible a fire nearby could have produced
enough smoke to register such levels for that one hour period.  No other
nearby monitors were affected.  Aside from any other localized events,
particulates should remain in the good to lower moderate range the next
couple of days across the Phoenix forecast area.

Check back tomorrow for the latest.  Until then, have a good day!

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If you have any questions or comments regarding this forecast please

Arizona Department of Environmental Quality
Office of Communications
1110 W. Washington St., Phoenix, AZ 85007
(602) 771-2215

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