Air Quality in Saint Charles, United States
Drizzle
20.1°C · 94.5% humidity
20.1°
Feels 20.1°
14
Good
Air quality is satisfactory. Enjoy outdoor activities.
1 station
Nearby Monitoring Stations
Saint Charles's air quality — share it
AQI Forecast
25
5am
25
25
14
8am
19
21
23
11am
24
25
26
2pm
24
24
24
5pm
25
25
25
8pm
34
34
34
11pm
34
54
34
2am
34
34
Air Quality Index Trend
46h · 2 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.
94.5%
Humidity
18.1 km/h
Wind SSW
1014.9 hPa
Pressure
1.4
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
3.4 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for Saint Charles?
Temperature & Precipitation
PM2.5 Trend
46h · 2 stationsPM2.53.4 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX1.4
Low
Station readings (1 station within 25 km)
3.4
Median
3.4
Average
3.4
Low
3.4
High
PM2.5 µg/m³ · Model: 5.9 · Bias: +2.5
What is the 7-day forecast for Saint Charles?
06-09
30.9° 13.7°
1.56 mm
06-10
31.5° 25.6°
1.5 mm
06-11
27.1° 14.1°
06-12
29.6° 17.2°
1.19 mm
06-13
29.7° 22.0°
0.63 mm
06-14
27.4° 20.0°
1.25 mm
06-15
25.2° 12.1°
0.31 mm
Both models agree
Avg diff: 5.5°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 2026-06-09T12:03 UTC.