What is the air quality in O'Fallon today?

The current Air Quality Index (AQI) in O'Fallon is 49 (Good). PM2.5 concentration is 11.8 µg/m³.

What is the temperature in O'Fallon right now?

The current temperature in O'Fallon is 12.7°C (feels like 12.7°C). Humidity is 39.0% and wind speed is 95.6 km/h.

Is it safe to go outside in O'Fallon?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0.0 (Low).

Air Quality in O'Fallon, United States

Windy

12.7°C · 39.0% humidity

12.7°

Feels 12.7°

Good

Air quality is satisfactory. Enjoy outdoor activities.

Calibrated model

Nearby Monitoring Stations

AQI Forecast

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Air Quality Index Trend

45h · 2 stn

View full history →

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.

39.0%

Humidity

95.6 km/h

Wind N

1025.9 hPa

Pressure

0.0

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

11.8 µg/m³

PM10

27.4 µg/m³

050100150200300500

What is the weather forecast for O'Fallon?

Temperature & Precipitation

PM2.5 Trend

45h · 2 stations

PM2.511.8 µg/m³ ✓ WHO

Good

PM1027.4 µg/m³

Good

UV INDEX0.0

Low

What is the 7-day forecast for O'Fallon?

10-20

12.9° 1.8°

10-21

25.1° 12.6°

7.19 mm

10-22

21.7° 9.4°

3.44 mm

10-23

12.8° 9.3°

10.31 mm

10-24

24.9° 11.6°

10-25

16.1° 2.1°

10-26

25.5° 5.4°

0.06 mm

Both models agree Avg diff: 4.4°C

What cities are near O'Fallon?

48 Saint Peters 21 Wentzville 15 Saint Charles 31 Chesterfield 32 Wildwood 32 Maryland Heights 29 Ballwin 36 Hazelwood 28 Manchester 31 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 2026-10-20T20:05 UTC.