Oregon Weather Alert Today: Air Stagnation Traps Cold, Fog, and Pollution Across Eugene and Willamette Valley

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Oregon wakes up under a trapped lid of cold air, where frost coats windshields and fog hangs low over quiet streets. The air feels heavy and still, with little movement to clear it out.

An Air Stagnation Advisory remains in effect until noon Friday for Eugene, Portland, and much of the Willamette Valley. Light winds and limited mixing allow cold air and pollutants to settle near the ground. Air quality may slowly deteriorate, especially during morning and evening hours…

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