While inversions are common in the Treasure Valley, this one has lasted an unusually long time. What’s going on? When will it end?

A shallow marine inversion kept polluted air trapped in the L.A. Basin for days. (Paul Duginski / Los Angeles Times) One good thing about Santa Ana winds: They really clear the air. During the first ...

Drive up to Bogus Basin right now and look out over the Treasure Valley; you’ll see a haze hanging over Boise and its surrounding cities. But for those below the haze … the view is not so interesting.

Morning inversion seen from Bogus Basin on Jan. 22, 2026.

Take a drive up to Bogus Basin during the winter and look out over the Treasure Valley and you may see a haze hanging over Boise and its surrounding cities. But for those below the haze … the view is ...