Air Quality in Saint Charles, United States
Partly Cloudy
16.5°C · 69.7% humidity
16.5°
Feels 16.5°
20
Good
Air quality is satisfactory. Enjoy outdoor activities.
2 stations
Nearby Monitoring Stations
Saint Charles's air quality — share it
AQI Forecast
34
8pm
34
34
20
11pm
24
20
22
2am
23
24
25
5am
26
26
24
8am
25
25
25
11am
25
25
27
2pm
27
27
27
5pm
27
27
Air Quality Index Trend
47h · 6 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.
69.7%
Humidity
20.5 km/h
Wind WNW
1014.1 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
4.93 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for Saint Charles?
Temperature & Precipitation
PM2.5 Trend
47h · 6 stationsPM2.54.93 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX0.7
Low
Station readings (2 stations within 25 km)
4.93
Median
4.8
Average
4.3
Low
5.3
High
PM2.5 µg/m³ · Model: 7.0 · Bias: +2.1
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
Where are air quality stations near Saint Charles?
What cities are near Saint Charles?
Get AQI alerts for Saint Charles
Notify me when air quality reaches:
Free · No account · Unsubscribe any time
Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-06-09T04:47 UTC.