Air Quality in Helena, United States
Partly Cloudy
21.7°C · 65.3% humidity
21.7°
Feels 21.7°
23
Good
Air quality is satisfactory. Enjoy outdoor activities.
1 station
Nearby Monitoring Stations
Helena's air quality — share it
AQI Forecast
25
2pm
25
25
23
5pm
25
25
27
8pm
27
34
24
11pm
24
24
25
2am
25
25
25
5am
27
27
25
8am
24
24
25
11am
25
24
Air Quality Index Trend
47h · 3 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. Current PM2.5 concentration in Helena is 1.1× the WHO annual guideline of 5 µg/m³.
65.3%
Humidity
8.2 km/h
Wind S
1011.4 hPa
Pressure
2.9
UV Moderate
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
5.5 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for Helena?
Temperature & Precipitation
PM2.5 Trend
47h · 3 stationsPM2.55.5 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX2.9
Moderate
Station readings (1 station within 25 km)
5.5
Median
5.5
Average
5.5
Low
5.5
High
PM2.5 µg/m³ · Model: 5.9 · Bias: +0.4
What is the 7-day forecast for Helena?
05-28
36.7° 24.2°
0.06 mm
05-29
34.5° 15.8°
8.13 mm
05-30
29.2° 21.5°
2.69 mm
05-31
32.8° 17.5°
06-01
31.1° 17.7°
1.37 mm
06-02
33.6° 18.5°
0.06 mm
06-03
28.4° 23.0°
Both models agree
Avg diff: 2.7°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 2026-05-28T22:51 UTC.