Air Quality in St. Charles, United States
Drizzle
24.4°C · 81.1% humidity
24.4°
Feels 24.4°
18
Good
Air quality is satisfactory. Enjoy outdoor activities.
1 station
Nearby Monitoring Stations
St. Charles's air quality — share it
AQI Forecast
24
4pm
24
25
18
7pm
22
30
31
10pm
25
26
24
1am
24
25
25
4am
25
25
25
7am
25
34
34
10am
34
34
27
1pm
27
25
Air Quality Index Trend
47h · 1 stnSt. 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.
81.1%
Humidity
37.3 km/h
Wind NNW
1012.7 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5
4.3 µg/m³
PM10▲
20.55 µg/m³
050100150200300500
What is the weather forecast for St. Charles?
Temperature & Precipitation
PM2.5 Trend
47h · 1 stationPM2.54.3 µg/m³
✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX0.7
Low
Station readings (1 station within 25 km)
4.3
Median
4.3
Average
4.3
Low
4.3
High
PM2.5 µg/m³ · Model: 7.1 · Bias: +2.8
What is the 7-day forecast for St. Charles?
05-29
26.1° 9.9°
13.38 mm
05-30
24.4° 15.0°
6.13 mm
05-31
30.0° 10.8°
06-01
30.5° 12.9°
8.5 mm
06-02
26.6° 14.7°
0.06 mm
06-03
25.8° 15.8°
8.62 mm
06-04
24.2° 19.6°
0.19 mm
Both models agree
Avg diff: 4.1°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 2026-05-29T23:43 UTC.