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Air quality in Montana
Air quality index (AQI) and PM2.5 air pollution in Montana
LIVE AQI CITY RANKING
Real-time Montana
Most polluted city ranking
| # | city | US AQI |
|---|---|---|
| 1 |  Winnett | 55 |
| 2 | Great Falls | 52 |
| 3 | Havre | 48 |
| 4 | Chester | 46 |
| 5 | Malta | 45 |
| 6 | West Glendive | 40 |
| 7 | Columbia Falls | 31 |
| 8 | Thompson Falls | 31 |
| 9 | Miles City | 30 |
| 10 | Libby | 26 |
(local time)
SEE WORLD AQI RANKINGAIR QUALITY DATA CONTRIBUTORS
113 Contributors
See all
3D animated air pollution map
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Unhealthy for sensitive groups
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The latest air quality news and resources.
Montana air quality data attribution
113Contributors
- USA National Park Service
5 stations
- Montana Department of Environmental Quality
3 stations
2 Government Contributors
- Nyet
1 station
- Abi D.
1 station
- Crosscut Mountain Sports Center
1 station
3 Individual Contributors
- 108 Anonymous contributors
108 stations
108 Anonymous Contributors
Which is the most polluted city in Montana?
- Winnett 55
- Great Falls 52
- Havre 48
- Chester 46
- Malta 45
- West Glendive 40
- Glasgow 37
- Fort Belknap Agency 35
- Chinook 34
- Sidney 33
- Jordan 32
- Wibaux 32
- Baker 31
- Columbia Falls 31
- Thompson Falls 31
- Forsyth 30
- Glendive 30
- Miles City 30
- Wolf Point 29
- Ekalaka 28
- Plentywood 28
- Scobey 28
- Terry 28
- Circle 27
- Colstrip 27
- Hysham 27
- Libby 26
- Pablo 26
- Lambert 25
- South Browning 25
- Conrad 23
- Shelby 23
- Hot Springs 22
- Roundup 22
- Birney 21
- Fort Benton 21
- Lame Deer 21
- Helena 20
- Plains 20
- Broadus 19
- Crow Agency 19
- Helena Valley Northeast 19
- Helena Valley Southeast 19
- Evergreen 18
- Helena Valley Northwest 18
- Montana City 18
- Somers 18
- Charlo 17
- Helena West Side 17
- Lakeside 17
- Malmstrom Air Force Base 17
- Stanford 17
- Sun Prairie 17
- Browning 16
- Clancy 16
- Cut Bank 16
- Kalispell 16
- Stevensville 16
- Dayton 15
- East Helena 15
- Eureka 15
- Ronan 15
- Ryegate 15
- Whitefish 15
- Boulder 14
- Clinton 14
- Deer Lodge 14
- Lewistown 14
- Lincoln 14
- North Browning 14
- Philipsburg 14
- Polson 14
- Seeley Lake 14
- Townsend 14
- Warm Springs 14
- Butte 13
- Butte-Silver Bow (Balance) 13
- Missoula 13
- Ravalli 13
- Superior 13
- West Yellowstone 13
- White Sulphur Springs 13
- East Missoula 12
- Harlowton 12
- Orchard Homes 12
- Arlee 11
- Hamilton 11
- Lolo 11
- Noxon 11
- West Glacier 11
- Whitehall 11
- Columbus 10
- Helena Valley West Central 10
- Lockwood 10
- Manhattan 10
- Three Forks 10
- Virginia City 10
- Anaconda 9
- Bigfork 9
- Hardin 9
- Big Timber 8
- Bonner-West Riverside 8
- Four Corners 8
- Absarokee 7
- Belgrade 7
- Bozeman 7
- Choteau 7
- Dillon 7
- Frenchtown 7
- Laurel 7
- Big Sky 5
- Billings 5
- Livingston 5
- Red Lodge 2
- Wisdom 1
AQI US, Metric