[ADEQ Forecasts] ADEQ Daily Air Quality Forecast - Tuesday, Jan. 3, 2012

Tue Jan 3 11:12:25 MST 2012

Health message for Tuesday January 03: Unusually sensitive people should consider reducing prolonged or heavy exertion.  

Health message for Wednesday January 04: Unusually sensitive people should consider reducing prolonged or heavy exertion.  

Synopsis and Discussion

PARTICLES:  More favorable dispersion on Monday contributed to the first overall good air quality day in the Valley since December 23.  However, Phoenix Sky Harbor Airport ACARS sounding data from this morning indicates that stagnation of the local air mass is on the increase again with a moderate (5-6 deg C) surface-based radiation inversion to ~1500', decreasing winds in the mixed layer, and POOR to MARGINAL dispersion by this afternoon.  A strong ridge aloft is now forecast to remain positioned over Arizona thru Thursday then begin to weaken on Friday.  Stagnation of the air mass over the Phoenix metro area due to warm air aloft and overnight inversion formation will be tempered by breezy down-slope winds again on Thursday - especially during the morning hours.  Some high hourly or instantaneous PM-10 (coarse particle) concentrations - such as the 112ug/m3 to 276ug/m3 readings at five monitoring sites between 5:24 and 9:00 a.m. this morning - will likely continue to occur under the current stagnant weather regime, but the risk for unhealthy 24-hour average concentrations will remain low.  Meanwhile, now that the holidays are over, smoke from residential wood-burning activities should be scaled back significantly with PM-2.5 (fine particle) levels hopefully confined to the low to mid-moderate range of the Air Quality Index. 
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For transportation alternatives:
www.valleymetro.org <http://www.valleymetro.org/> 

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
ms15@azdeq.gov <mailto:ms15@azdeq.gov> 

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