Active AlertsRichmond, Portland, OR

What: For the Air Stagnation Advisory, light winds and limited air movement will lead to a period of stagnant air conditions. For the Dense Fog Advisory, visibility one quarter mile or less in dense fog.
Where: Central and Southern Willamette Valley, Tualatin Valley, Portland West Hills and Chehalem Mountain, Inner Portland Metro, North Clark County Lowlands, and Inner Vancouver Metro.
When: For the Air Stagnation Advisory, until 4 AM PST Friday. For the Dense Fog Advisory, from 10 PM this evening to 11 AM PST Tuesday.
Impacts: Deteriorating air quality may cause issues for people with respiratory problems. Low visibility could make driving conditions hazardous.

State air quality agencies highly recommend 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. Check with your local burn agency for any current restrictions in your area. People with respiratory illness should follow their physician's advice for dealing with high levels of air pollution during periods of stagnant air, especially if an Air Quality Alert is in effect for your area. To see if an Air Quality Alert is in effect for your area, go to www.weather.gov/pqr and left-click your location on the homepage map display. Alternatively, you could also type your location into the search bar found on the top-left hand side of the homepage. From there, you will see an Air Quality Alert listed at the top if one is in effect for your location; you can click the alert to read more details if applicable. If driving, slow down and leave plenty of distance ahead of you. Pedestrians and cyclists should wear bright or reflective clothing to increase the chances of being seen by others in poor visibility conditions.