Statement as of 11:24 AM PST on December 13, 2017
Expires 5:00 PM EST on December 14, 2017
... 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... most of Clark County, but excluding areas near the
Columbia River gorge.
* 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