[ADEQ Forecasts] AIR QUALITY FORECAST FOR WEDNESDAY, MARCH 18, 2009ADEQ

[forecasts@lists.azdeq.gov]

http://www.azdeq.gov/ensemble.pdf

For transportation alternatives:
http://www.valleymetro.org

Health message for Tuesday March 17: Unusually sensitive people should
consider reducing prolonged or heavy exertion outdoors.  

Health message for Wednesday March 18: Unusually sensitive people should
consider reducing prolonged or heavy exertion outdoors. 

Synopsis and Discussion
An upper level ridge will slowly shift from west to east over the next
few days.  As it does so, it will strengthen in intensity, leading to
stronger inversions during the overnight and early morning hours.  As a
result, conditions will become increasingly stagnant during that time.
High mixing heights during the afternoon hours, associated with near
record temperatures, should help offset the morning stagnation and keep
daily particulate pollution below the national health standards.
Nonetheless, maximum concentrations for particulate matter during the
next few days will likely reach the moderate category of the Air Quality
Index (AQI) for the first time in two weeks.  Meanwhile, ozone
production remains in line with climatological values.  While
yesterday's ozone levels were just shy of the moderate range of the AQI,
ozone production is expected to increase over the next few days and
8-hour concentrations will likely reach the moderate range of the AQI
once again.  Overall, pollution levels are expected to remain below the
mid-moderate range of the AQI through this forecast period. - Paris    

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