What is the air quality in O'Fallon today?

The current Air Quality Index (AQI) in O'Fallon is 22 (Good). PM2.5 concentration is 5.26 µg/m³.

What is the temperature in O'Fallon right now?

The current temperature in O'Fallon is 19.1°C (feels like 19.1°C). Humidity is 95.9% and wind speed is 52.3 km/h.

Is it safe to go outside in O'Fallon?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 9.4 (Very High).

Air Quality in O'Fallon, United States

Rain

19.1°C · 95.9% humidity

19.1°

Feels 19.1°

Good

Air quality is satisfactory. Enjoy outdoor activities.

Calibrated model

Nearby Monitoring Stations

AQI Forecast

34 7am

22 10am

23 1pm

25 4pm

33 7pm

54 10pm

54 1am

54 4am

Air Quality Index Trend

45h · 5 stn

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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.

95.9%

Humidity

52.3 km/h

Wind NE

1018.9 hPa

Pressure

9.4

UV Very High

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

5.26 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for O'Fallon?

Temperature & Precipitation

PM2.5 Trend

45h · 5 stations

PM2.55.26 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX9.4

Very High

Both models agree Avg diff: 7.1°C

What cities are near O'Fallon?

22 Saint Peters 23 Wentzville 31 Saint Charles 26 Chesterfield 24 Wildwood 32 Maryland Heights 44 Ballwin 34 Hazelwood 42 Manchester 32 Creve Coeur

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ModerateAQI > 50 Unhealthy for Sensitive GroupsAQI > 100 UnhealthyAQI > 150 Very UnhealthyAQI > 200

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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 2026-09-05T15:07 UTC.