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Idaho — A dull gray sky presses low over the Treasure Valley this morning, and the air feels heavy before the day even gets moving. Calm winds and trapped cold air are setting the stage for worsening air quality across southwest Idaho.
According to the National Weather Service in Boise, an Air Stagnation Advisory remains in effect through late Thursday morning. A strong temperature inversion has settled near the surface, preventing pollutants from dispersing. Light winds and limited mixing allow exhaust, wood smoke, and other emissions to linger, especially in valley locations…