[ADEQ Forecasts] ADEQ Daily Air Quality Forecast - Wednesday, May 19, 2010

Tue May 18 12:10:34 MST 2010

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Health message for Tuesday, May 18: Unusually sensitive people should consider limiting prolonged or heavy exertion outdoors. 

Health message for Wednesday, May 19: Unusually sensitive people should consider limiting prolonged or heavy exertion outdoors. 

Synopsis and Discussion
A rapid warm up is in store for the desert southwest the next few days as temperatures rise from around 90°F on Tuesday to the triple digits on Thursday and Friday.  A significant trough of low pressure will again force its way east through Arizona on Saturday, shoving the area of high pressure to the south.  It won't bring any rain, but associated winds could again increase the threat of blowing dust across the deserts while elevating the risk of wild fires around the state.  Temperature will drop sharply by nearly 10 degrees from Friday to Saturday.

All pollutants were in the "Good" range of the Air Quality Index (AQI) on Monday.  However, both PM10 and Ozone concentrations were on the doorstep of the "Moderate" category.  We expect to see ozone easily breach that boundary today and especially Wednesday and Thursday due to the much lighter winds, ample sunshine and above normal heat.  An Ozone Health Watch is possible on Thursday and/or Friday.  We'll keep a close eye on these levels.  PM10 concentrations could slip into the "Moderate" category at one or two monitors the next few days, but there will be no threat of nearing its health standard this week.

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

If you have any questions or comments regarding this forecast please contact:

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


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