Montana’s air quality is continuing to deteriorate in some areas, with both the Bitterroot and Gallatin Valleys reporting unhealthy conditions Thursday because of fire smoke.

Missoula, Frenchtown, Great Falls, Billings and Helena have had varied air quality throughout the day. Missoula has ranged from “good” to, most recently, “unhealthy to sensitive groups,” according to a county press release issued late Thursday afternoon.

While much of the state has experienced varied air quality because of the fires in the region, the brunt of the pollution continues to plague the Bitterroot and southwest Montana. Most of that smoke in the west has been pouring out of Idaho. But additional Montana fires are also contributing to the problem.

via Air quality worsens, Missoula Valley sees influx of smoke | KPAX.com | Missoula, Montana.