Air Quality in Helena, United States
Drizzle
32.8°C · 43.2% humidity
32.8°
Feels 35.9°
30
Good
Air quality is satisfactory. Enjoy outdoor activities.
1 station
Nearby Monitoring Stations
Helena's air quality — share it
AQI Forecast
54
12pm
54
34
30
3pm
34
34
54
6pm
54
27
34
9pm
34
27
27
12am
27
27
27
3am
27
27
27
6am
27
27
34
9am
34
34
Air Quality Index Trend
28h · 2 stnHelena's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.
43.2%
Humidity
34.5 km/h
Wind SE
1010.5 hPa
Pressure
9.4
UV Very High
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
7.2 µg/m³
PM10
20.55 µg/m³
050100150200300500
What is the weather forecast for Helena?
Temperature & Precipitation
PM2.5 Trend
28h · 2 stationsPM2.57.2 µg/m³
✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX9.4
Very High
Station readings (1 station within 25 km)
7.2
Median
7.2
Average
7.2
Low
7.2
High
PM2.5 µg/m³ · Model: 7.1 · Bias: -0.1
What is the 7-day forecast for Helena?
07-21
32.8° 22.4°
7.37 mm
07-22
32.5° 22.9°
07-23
35.7° 21.4°
12.44 mm
07-24
29.6° 21.6°
1.5 mm
07-25
31.8° 20.7°
10.06 mm
07-26
35.3° 21.5°
5.19 mm
07-27
26.9° 21.8°
0.5 mm
Both models agree
Avg diff: 3.6°C
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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-07-21T20:43 UTC.