Air Quality in O'Fallon, United States
Partly Cloudy
22.0°C · 65.6% humidity
22.0°
Feels 22.0°
32
Good
Air quality is satisfactory. Enjoy outdoor activities.
Calibrated model
Nearby Monitoring Stations
O'Fallon's air quality — share it
AQI Forecast
25
3pm
25
25
32
6pm
31
37
36
9pm
35
35
35
12am
27
27
27
3am
27
27
27
6am
27
25
25
9am
25
25
25
12pm
25
25
Air Quality Index Trend
47h · 5 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.
65.6%
Humidity
25.7 km/h
Wind NNW
1012.9 hPa
Pressure
2.2
UV Moderate
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
7.77 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for O'Fallon?
Temperature & Precipitation
PM2.5 Trend
47h · 5 stationsPM2.57.77 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX2.2
Moderate
What is the 7-day forecast for O'Fallon?
06-08
31.9° 15.0°
0.75 mm
06-09
31.4° 14.3°
6.0 mm
06-10
29.2° 21.5°
56.25 mm
06-11
27.4° 19.1°
06-12
30.2° 20.6°
0.31 mm
06-13
27.6° 23.1°
0.19 mm
06-14
32.4° 15.2°
8.13 mm
Both models agree
Avg diff: 4.1°C
What cities are near O'Fallon?
Get AQI alerts for O'Fallon
Notify me when air quality reaches:
Free · No account · Unsubscribe any time
Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-06-08T23:20 UTC.