Air Quality in Montana
10-year air quality trends for 19 monitored areas in Montana.
See full Montana air quality rankings →All Monitored Areas in Montana
Rosebud, Montana
Rosebud County · AQI 23 (5yr avg) · Improving · Ozone
Ravalli, Montana
Ravalli County · AQI 22 (5yr avg) · Improving · PM2.5
Roosevelt, Montana
Roosevelt County · AQI 14 (5yr avg) · Stable · PM2.5
Lake, Montana
Lake County · AQI 10 (5yr avg) · Stable · PM2.5
Silver Bow, Montana
Silver Bow County · AQI 27 (5yr avg) · Improving · PM2.5
Powell, Montana
Powell County · AQI 11 (5yr avg) · Stable · PM2.5
Sheridan, Montana
Sheridan County · AQI 16 (5yr avg) · Stable · PM2.5
Cascade, Montana
Cascade County · AQI 30 (5yr avg) · Improving · PM2.5
Yellowstone, Montana
Yellowstone County · AQI 33 (5yr avg) · Stable · PM2.5
Gallatin, Montana
Gallatin County · AQI 32 (5yr avg) · Stable · PM2.5
Richland, Montana
Richland County · AQI 38 (5yr avg) · Stable · Ozone
Phillips, Montana
Phillips County · AQI 36 (5yr avg) · Stable · Ozone
Flathead, Montana
Flathead County · AQI 40 (5yr avg) · Stable · PM2.5
Fergus, Montana
Fergus County · AQI 40 (5yr avg) · Worsening · Ozone
Lewis and Clark, Montana
Lewis and Clark County · AQI 44 (5yr avg) · Stable · Ozone
Powder River, Montana
Powder River County · AQI 41 (5yr avg) · Worsening · Ozone
Missoula, Montana
Missoula County · AQI 54 (5yr avg) · Improving · PM2.5
Lincoln, Montana
Lincoln County · AQI 52 (5yr avg) · Worsening · PM2.5
Sanders, Montana
Sanders County · AQI 36 (5yr avg) · Worsening · PM2.5
Frequently Asked Questions
Montana has 19 monitored areas with an average 5-year AQI of 31 and an average Air Quality Grade of B. 6 cities are improving, 7 are worsening, and 6 are stable.
Rosebud, Montana has the best Air Quality Grade (A) in Montana with a 5-year average AQI of 23.
Of 19 monitored areas in Montana, 6 are showing improving trends, 7 are worsening, and 6 remain stable over the past decade.