East Slopes Northern Cascades

Air Stagnation Advisory:

Issued at: 11:53 am PST on November 27, 2015, expires at: 12:00 PM PST on November 30, 2015
  • ...Air stagnation advisory remains in effect until 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 Columbia 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...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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