Air Quality in O'Fallon, United States
Partly Cloudy
30.0°C · 55.4% humidity
30.0°
Feels 33.8°
37
Good
Air quality is satisfactory. Enjoy outdoor activities.
1 station
Nearby Monitoring Stations
O'Fallon's air quality — share it
AQI Forecast
25
9am
25
25
37
12pm
34
31
29
3pm
28
27
27
6pm
26
28
28
9pm
27
27
27
12am
27
27
25
3am
25
25
25
6am
25
27
Air Quality Index Trend
45h · 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.
55.4%
Humidity
33.5 km/h
Wind N
1020.2 hPa
Pressure
17.4
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
8.9 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for O'Fallon?
Temperature & Precipitation
PM2.5 Trend
45h · 6 stationsPM2.58.9 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX17.4
Extreme
Station readings (1 station within 25 km)
8.9
Median
8.9
Average
8.9
Low
8.9
High
PM2.5 µg/m³ · Model: 6.25 · Bias: -2.7
What is the 7-day forecast for O'Fallon?
05-29
30.0° 9.0°
1.69 mm
05-30
29.3° 19.2°
1.44 mm
05-31
31.4° 12.6°
06-01
29.7° 17.5°
06-02
26.0° 13.7°
0.06 mm
06-03
29.7° 24.2°
0.88 mm
06-04
28.3° 19.6°
2.38 mm
Both models agree
Avg diff: 4.6°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 2026-05-29T17:18 UTC.