Okanogan Valley Severe Watches & Warnings NOAA Weather Radio

Air Stagnation Advisory
Statement as of 11:40 AM PST on November 26, 2015

... Air stagnation advisory remains in effect from 9 PM this
evening to noon PST Monday...

* air quality... poor ventilation will result in a build up of
pollutants near the surface. Mountain valleys will be
especially susceptible to stagnant air and pollution build up.
Light northeasterly winds across the basin will also tend to
push pollutants up against the east slopes of the northern
Cascades between Thursday and Saturday. These winds will
become calm by Sunday with a greater risk of pollutant build
up over much of the region by this time.

* Timing... Thursday night through Monday morning.

* Impacts... prolonged periods of stagnant air can hold fine
particulates close to the ground and degrade air quality.

Precautionary/preparedness actions...

An air stagnation advisory indicates that due to limited movement
of an air mass across the advisory area... pollution has the
potential to increase to dangerous levels. Persons with
respiratory illness should follow their physicians advice for
dealing with high levels of air pollution.

During periods of stagnant air... state air quality agencies
highly recommended that no outdoor burning occur and that
residential wood burning devices be limited as much as possible.
According to state air quality agencies... prolonged periods of
stagnant air can hold pollutants close to the ground... where
people live and breathe.

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