Air Quality in O'Fallon, United States

Rain
19.5°C · 96.9% humidity
19.5°
Feels 19.5°
48
Good
Air quality is satisfactory. Enjoy outdoor activities.
2 stations

Nearby Monitoring Stations

AQI Forecast
34 9am
34
34
48 12pm
44
41
39 3pm
38
37
36 6pm
35
55
55 9pm
34
34
34 12am
27
27
27 3am
34
34
34 6am
34
25
AD 728×90

Air Quality Index Trend

45h · 6 stn

O'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.

96.9%
Humidity
48.3 km/h
Wind NE
1019.0 hPa
Pressure
19.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
48
11.6 µg/m³
PM10
19
20.55 µg/m³
050100150200300500

What is the weather forecast for O'Fallon?

Temperature & Precipitation

PM2.5 Trend

45h · 6 stations
PM2.511.6 µg/m³ ✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX19.9
Extreme
AD 300×250
Station readings (2 stations within 25 km)
11.6
Median
11.6
Average
10.6
Low
12.6
High
PM2.5 µg/m³ · Model: 10.85 · Bias: -0.8
Both models agree Avg diff: 6.8°C

Where are air quality stations near O'Fallon?

52
East St. Louis, Illinois, USA
21.8 km PM2.5: 12.6 µg/m³
35
Blair Street, Missouri, USA
26.0 km PM2.5: 8.4 µg/m³

What cities are near O'Fallon?

47 Fairview Heights 47 Belleville 46 Collinsville 48 East Saint Louis 41 Granite City 39 Edwardsville 44 St. Louis 39 Lemay 37 Spanish Lake 27 University City
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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 2026-09-05T17:11 UTC.