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Pennsylvania, Allegheny

Special Weather Statement

Statement as of 3:04 PM EDT on March 17, 2010

Expires 9:15 PM EDT on March 18, 2010


... Air quality alert is in effect from 12 am Thursday until 12 am
Friday...

The Pennsylvania department of environmental protection has issued
an air quality action day for the following counties...

Allegheny.

This air quality action day is being issued for southeastern
Allegheny County... which includes the municipalities for Clairton...
Glassport... Liberty... Lincoln... and Port Vue.

An area of high pressure building into the region will continue to
keep our skies clear for much of the day. Early in the morning... the
presence of the high pressure system should promote the formation of
an inversion over the region. The inversion will limit vertical and
horizontal mixing within the boundary layer... allowing PM 2.5 levels
to rise. As the sun warms the surface late in the morning... we will
see more mixing result and PM 2.5 levels fall. Late in the day... an
inversion should reform over the area. Overall... the daily average
of PM 2.5 should range in the code Orange range... thus triggering
the issuance of an air quality action day for the region.



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