Air Quality in Helena, United States
Windy
34.6°C · 45.8% humidity
34.6°
Feels 38.9°
38
Good
Air quality is satisfactory. Enjoy outdoor activities.
1 station
Nearby Monitoring Stations
Helena's air quality — share it
AQI Forecast
54
7pm
54
54
38
10pm
23
26
28
1am
30
31
32
4am
32
33
26
7am
26
27
27
10am
27
27
27
1pm
27
27
27
4pm
27
27
Air Quality Index Trend
36h · 4 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.
45.8%
Humidity
42.8 km/h
Wind NW
1012.1 hPa
Pressure
4.4
UV Moderate
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
9.1 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for Helena?
Temperature & Precipitation
PM2.5 Trend
36h · 4 stationsPM2.59.1 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX4.4
Moderate
Station readings (1 station within 25 km)
9.1
Median
9.1
Average
9.1
Low
9.1
High
PM2.5 µg/m³ · Model: 10.0 · Bias: +0.9
What is the 7-day forecast for Helena?
08-03
34.6° 22.4°
0.31 mm
08-04
34.9° 22.9°
0.13 mm
08-05
33.3° 16.8°
2.31 mm
08-06
38.3° 20.6°
08-07
34.3° 22.5°
3.06 mm
08-08
34.7° 22.3°
8.63 mm
08-09
32.9° 25.0°
Both models agree
Avg diff: 2.2°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 2026-08-08T03:00 UTC.