Air Quality in St. Charles, United States

Windy
18.9°C · 61.7% humidity
18.9°
Feels 18.9°
17
Good
Air quality is satisfactory. Enjoy outdoor activities.
2 stations

Nearby Monitoring Stations

AQI Forecast
6pm
9pm
12am
3am
6am
9am
12pm
3pm
AD 728×90

Air Quality Index Trend

47h · 5 stn

St. Charles's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.

61.7%
Humidity
46.2 km/h
Wind NNW
1010.3 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
PM2.5
17
3.95 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

Temperature & Precipitation

PM2.5 Trend

47h · 5 stations
PM2.53.95 µg/m³ ✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX0.7
Low
AD 300×250
3.95
Median
3.95
Average
2.4
Low
5.5
High
PM2.5 µg/m³ · Model: 6.25 · Bias: +2.3
06-09
30.8° 10.6°
0.56 mm
06-10
21.8° 19.8°
20.06 mm
06-11
24.5° 14.7°
0.88 mm
06-12
28.7° 20.0°
5.56 mm
06-13
27.5° 22.2°
4.94 mm
06-14
30.7° 14.6°
06-15
32.3° 23.5°
0.06 mm
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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 2026-06-09T02:13 UTC.