Deteriorating air quality and freezing fog are in the forecast for the Tri-Cities.
Stagnant air can be blamed for both, as an upper level ridge builds over the Pacific Northwest this week, says the National Weather Service.
It has issued an air stagnation advisory through noon Thursday.
Wednesday morning Benton Clean Air Agency monitoring showed the air quality in the Tri-Cities rated as “good.”
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But the weather service said there is a potential for air quality to deteriorate to moderate or even unhealthy in a broad area that stretches from the Tri-Cities northwest to Yakima and down the eastern portion of the Columbia River Gorge.
Freezing fog or fog is forecast morning and nights through at least Monday in the Tri-Cities. Highs will remain in the 30s and lows in the 20s through Monday, according to the weather service.