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

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
AD 728×90

Air Quality Index Trend

46h · 2 stn

Saint 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
PM2.5
14
3.4 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

Temperature & Precipitation

PM2.5 Trend

46h · 2 stations
PM2.53.4 µg/m³ ✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX1.4
Low
AD 300×250
3.4
Median
3.4
Average
3.4
Low
3.4
High
PM2.5 µg/m³ · Model: 5.9 · Bias: +2.5
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
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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.