[ADEQ Forecasts] ADEQ Daily Air Quality Forecast - Thursday, November 24, 2011

[forecasts@lists.azdeq.gov]

Health message for Wednesday November 23: Unusually sensitive people
should consider reducing prolonged or heavy exertion. 

Health message for Thursday November 24: No health impacts are expected.



Synopsis and Discussion
PARTICLES: Another upper level trough in the mid-latitude storm track is
poised to approach and move over AZ from the west on Thanksgiving Day
and early Friday.  It appears that the bulk of the precipitation will
occur over the southeast portion of the state.  In its wake a very
strong ridge aloft will begin building overhead on Friday afternoon.
For the Phoenix metro area only light rainfall amounts are expected, but
they should be sufficient to keep highest coarse particle (PM-10) levels
within the good range of the Air Quality Index.  So far this week there
has been no indication that fine particle (PM-2.5) concentrations have
been impacted by smoke emissions from residential wood-burning and
hopefully this will continue to be the case.  
OZONE:  Although Valley ozone precursor (NOx & VOC) emissions tend to
remain fairly constant all year, by October those factors conducive to
efficient ozone production - such as sun angle, day length, and
excessive heat - have all become less.  Thus, local ozone levels are
typically not much of an air quality problem again until late March.  


For more information, please visit our Web page:
www.azdeq.gov/environ/air/ozone/ensemble.pdf 

For transportation alternatives:
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