Stagnant air conditions will have the potential to trap pollutants near the ground promoting deteriorated air quality. The areas of concern include the WA/OR Lower Columbia Basin, WA/OR Blue Mountain Foothills, Kittitas and Yakima Valleys, Simcoe Highlands, central and north central Oregon.
An air stagnation advisory is in effect through 4 PM Monday. Poor air quality may cause issues for people with respiratory problems.
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