Air Quality in O'Fallon, United States
Cloudy
15.0°C · 77.7% humidity
15.0°
Feels 15.0°
30
Good
Air quality is satisfactory. Enjoy outdoor activities.
1 station
Nearby Monitoring Stations
O'Fallon's air quality — share it
AQI Forecast
25
9pm
25
25
30
12am
29
28
27
3am
26
26
26
6am
25
24
24
9am
24
24
24
12pm
25
25
25
3pm
25
25
25
6pm
25
27
Air Quality Index Trend
46h · 6 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.
77.7%
Humidity
24.5 km/h
Wind NW
1014.0 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
7.2 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for O'Fallon?
Temperature & Precipitation
PM2.5 Trend
46h · 6 stationsPM2.57.2 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX0.7
Low
Station readings (1 station within 25 km)
7.2
Median
7.2
Average
7.2
Low
7.2
High
PM2.5 µg/m³ · Model: 6.0 · Bias: -1.2
What is the 7-day forecast for O'Fallon?
06-09
29.6° 15.0°
7.81 mm
06-10
30.3° 22.1°
62.31 mm
06-11
28.3° 18.0°
06-12
30.8° 20.8°
0.19 mm
06-13
27.0° 22.6°
2.0 mm
06-14
31.6° 16.7°
15.75 mm
06-15
33.4° 24.5°
0.06 mm
Both models agree
Avg diff: 3.8°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 2026-06-09T05:00 UTC.