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Spokane, Washington – Poor air quality concerns are increasing across eastern Washington as a persistent temperature inversion settles over the region, prompting an Air Stagnation Advisory in effect through at least noon Thursday.
Calm winds and high pressure overhead are trapping cold air near the surface, preventing pollutants from dispersing. Temperatures in the Spokane area are expected to remain in the upper 20s to low 30s overnight, while warmer air aloft acts like a lid, holding smoke and vehicle emissions close to the ground. According to the National Weather Service in Spokane, these conditions are especially common during winter and can lead to a steady decline in air quality, particularly in low-lying valleys…