Air Quality in O'Fallon, United States
Windy
25.6°C · 45.9% humidity
25.6°
Feels 25.6°
30
Good
Air quality is satisfactory. Enjoy outdoor activities.
Calibrated model
Nearby Monitoring Stations
O'Fallon's air quality — share it
AQI Forecast
54
3pm
54
54
30
6pm
37
42
45
9pm
48
49
51
12am
52
52
53
3am
53
53
54
6am
34
34
34
9am
34
54
34
12pm
54
34
Air Quality Index Trend
37h · 3 stnO'Fallon's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.
45.9%
Humidity
64.0 km/h
Wind NE
1017.8 hPa
Pressure
5.9
UV High
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
7.08 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for O'Fallon?
Temperature & Precipitation
PM2.5 Trend
37h · 3 stationsPM2.57.08 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX5.9
High
What is the 7-day forecast for O'Fallon?
08-03
29.7° 19.6°
08-04
34.7° 18.0°
08-05
37.3° 14.5°
2.38 mm
08-06
39.8° 20.8°
1.5 mm
08-07
32.8° 22.0°
08-08
37.3° 22.7°
1.38 mm
08-09
39.8° 25.0°
0.5 mm
Both models agree
Avg diff: 3.8°C
What cities are near O'Fallon?
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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 2026-08-07T23:58 UTC.