Montana(MT)

Air quality overview and monitoring data — 2025

708

Monitoring Sites

4,941

Active Monitors

44

Counties with Data

61

Cities Monitored

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County Air Quality

CountyMedian AQI90th %ileMax AQIGoodModerateUSGUnhealthy
Lake49920000
Rosebud4172118000
Powell6202117000
Roosevelt9313817000
Beaverhead122348175000
Hill1334157141701
Sheridan13303119000
Dawson1430162172801
Gallatin142562224200
Teton142689169400
Sanders152131181000
Phillips1841168161811
Ravalli1956801423200
Glacier2236117161510
Silver Bow2754771503100
Missoula3856821513000
Custer3949951651600
Richland39531651572121
Yellowstone3952851572400
Flathead4059801834000
Fergus4449871661400
Lewis and Clark4569931196300
Lincoln456792968000

Pollutant Trends

Ozone

No data available

PM2.5

No data available

PM10

No data available

CO

No data available

NO2

No data available

SO2

No data available