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.
The advisory includes Spokane, Coeur d’Alene, Colville, Republic, Omak, Wilbur, and surrounding communities. Areas with wood-burning stoves and increased vehicle traffic are most likely to see elevated pollution levels. According to forecasters, the lack of wind means even routine emissions can accumulate over time, increasing health risks for sensitive groups.
People with asthma, heart disease, or other respiratory conditions may notice worsening symptoms. Health officials recommend limiting prolonged outdoor activity, especially during the overnight and morning hours. Residents are also encouraged to reduce wood burning where possible and avoid unnecessary idling.
The inversion is expected to persist until a stronger weather system arrives later in the week. Until then, air quality improvements will be limited, particularly during the colder nighttime hours. According to the National Weather Service, mixing improves slightly during the afternoon but deteriorates again after sunset as temperatures fall and winds go calm.
