... Air stagnation advisory remains in effect until 2 PM PST
* air quality... air quality may deteriorate due to an extended
period of stagnant air conditions.
* Timing... through Thursday afternoon.
* Locations... the lower Columbia and I-5 corridor in Cowlitz
* impacts... limited ventilation may result in deteriorating air
quality continuing this week.
An air stagnation advisory indicates that due to limited movement
of an air mass across the advisory area, pollution will increase
to dangerous levels. Persons with respiratory illness should
follow their physicians advice for dealing with high levels of
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Air Stagnation Advisory
Issued: 9:18 AM PST Dec. 11, 2017 – National Weather Service