Air Quality in Saint Charles, United States
Rain
20.4°C · 95.1% humidity
20.4°
Feels 20.4°
20
Good
Air quality is satisfactory. Enjoy outdoor activities.
2 stations
Nearby Monitoring Stations
Saint Charles's air quality — share it
AQI Forecast
27
5am
27
27
20
8am
21
22
23
11am
24
24
26
2pm
27
27
27
5pm
27
27
34
8pm
34
54
34
11pm
34
34
34
2am
27
27
Air Quality Index Trend
46h · 5 stnSaint 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.
95.1%
Humidity
81.7 km/h
Wind S
1009.0 hPa
Pressure
4.4
UV Moderate
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
4.73 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for Saint Charles?
Temperature & Precipitation
PM2.5 Trend
46h · 5 stationsPM2.54.73 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX4.4
Moderate
Station readings (2 stations within 25 km)
4.73
Median
4.7
Average
4.6
Low
4.8
High
PM2.5 µg/m³ · Model: 5.9 · Bias: +1.2
What is the 7-day forecast for Saint Charles?
06-09
33.7° 16.5°
4.94 mm
06-10
30.5° 22.1°
51.0 mm
06-11
29.0° 20.6°
06-12
32.1° 20.9°
0.44 mm
06-13
28.2° 24.4°
0.56 mm
06-14
33.3° 17.4°
10.19 mm
06-15
33.7° 25.0°
0.25 mm
Both models agree
Avg diff: 3.9°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 2026-06-09T13:10 UTC.