Lewistown, Montana, USA Air Quality

Monitoring Station · Great Falls, United States
69
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
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Nearby Monitoring Stations

GoodModerateUSGUnhealthyVery UnhealthyHazardous
AQI Forecast Calibrated
42 6am
45
69
33 9am
33
33
13 12pm
33
33
33 3pm
33
13
6 6pm
6
6
— 9pm
—
—
— 12am
—
—
— 3am
—
—
Station readings
42
69
CAMS model adj -21
66
66
66
54
54
54
34
54
54
54
54
34
27
27
27

Air Quality Forecast (24h)

PM2.520.7 µg/m³ ×1.4 WHO
Moderate
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Nearby Cities

60 Great Falls 60 Billings 74 Bozeman 75 Helena 84 Butte 66 Sheridan 55 Lethbridge

Station data from AQICN. AQI forecast from ECMWF CAMS. AQI calculated using US EPA standard. Updated 2026-08-08T09:07 UTC.