Air Quality in Saint Charles, United States

Drizzle
19.7°C · 96.0% humidity
19.7°
Feels 19.7°
32
Good
Air quality is satisfactory. Enjoy outdoor activities.
2 stations

Nearby Monitoring Stations

AQI Forecast
54 10am
34
34
32 1pm
34
34
34 4pm
34
34
34 7pm
54
54
54 10pm
54
54
54 1am
34
34
34 4am
34
34
54 7am
27
27
AD 728×90

Air Quality Index Trend

45h · 4 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.

96.0%
Humidity
44.1 km/h
Wind NE
1018.9 hPa
Pressure
19.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
32
7.78 µg/m³
PM10
19
20.55 µg/m³
050100150200300500

What is the weather forecast for Saint Charles?

Temperature & Precipitation

PM2.5 Trend

45h · 4 stations
PM2.57.78 µg/m³ ✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX19.9
Extreme
AD 300×250
Station readings (2 stations within 25 km)
7.78
Median
8.15
Average
6.7
Low
9.6
High
PM2.5 µg/m³ · Model: 10.85 · Bias: +3.1

What is the 7-day forecast for Saint Charles?

09-05
27.6° 19.7°
3.31 mm
09-06
38.0° 18.5°
3.38 mm
09-07
29.5° 22.9°
0.06 mm
09-08
25.8° 21.0°
17.69 mm
09-09
25.9° 17.1°
4.0 mm
09-10
31.5° 19.1°
0.69 mm
09-11
38.6° 20.4°
0.13 mm
Both models agree Avg diff: 6.5°C

Where are air quality stations near Saint Charles?

35
Ladue, Missouri, USA
18.7 km PM2.5: 8.4 µg/m³
52
Forest Park, Missouri, USA
24.3 km PM2.5: 12.6 µg/m³

What cities are near Saint Charles?

31 Maryland Heights 32 Hazelwood 28 Saint Peters 35 Florissant 32 Overland 32 Creve Coeur 28 Chesterfield 35 Ferguson 34 Old Jamestown 28 O'Fallon
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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 2026-09-05T18:17 UTC.