Idaho – Cold, motionless air settles across the Treasure Valley this morning, pressing low against rooftops and foothills. The sky looks flat and gray, and the air feels heavy with trapped pollution.
According to the National Weather Service in Boise, an Air Stagnation Advisory remains in effect until early Friday morning. Light winds and a strong temperature inversion prevent vertical mixing, allowing pollutants to build near the surface. Conditions impact portions of south-central and southwest Idaho, including Boise, Meridian, Nampa, Caldwell, and nearby valleys.
Early temperatures sit near 28 degrees, reinforcing the inversion. Calm winds under 5 mph offer little relief. Air quality may deteriorate through the day, especially during the morning and evening hours when emissions peak. People with asthma, heart disease, or other respiratory conditions may notice worsening symptoms.
Across the Boise metro, visibility remains clear, but air quality is the main concern. Wood smoke and vehicle emissions linger longer than usual. Officials urge residents to limit outdoor exertion and avoid unnecessary wood burning when possible. Keeping indoor air clean becomes especially important during prolonged stagnation events.
Cloud cover dominates today, holding highs near 30 degrees. Tonight stays cloudy and cold, with lows dropping into the low 20s. Pollution remains trapped close to the ground through the night.
Friday begins a slow transition. Clouds thin gradually, and light northwest winds develop by late morning. Highs reach the low 30s. Improved mixing helps air quality recover through the afternoon.
The weekend looks brighter and colder. Saturday turns partly sunny with highs near 32 degrees, followed by a mostly clear night near 21. Sunday brings sunshine and a high near 34, offering the cleanest air of the period.
Early next week trends slightly warmer, with highs climbing into the mid-30s to near 38 by Tuesday. Clouds increase midweek, and air quality could fluctuate again if winds weaken.
If you feel irritated eyes or breathing discomfort today, limit time outdoors. How noticeable is the air where you live this morning?
Five-Day Outlook for Boise, Idaho
Today: Cloudy, high near 30.
Friday: Decreasing clouds, high near 33.
Saturday: Partly sunny, high near 32.
Sunday: Sunny, high near 34.
Monday: Partly sunny, high near 36.
