What is the air quality in St. Charles today?

The current Air Quality Index (AQI) in St. Charles is 18 (Good). PM2.5 concentration is 4.3 µg/m³.

What is the temperature in St. Charles right now?

The current temperature in St. Charles is 7.2°C (feels like 3.8°C). Humidity is 75.0% and wind speed is 20.0 km/h.

Is it safe to go outside in St. Charles?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0.0 (Low).

Air Quality in St. Charles, United States

Cloudy

7.2°C · 75.0% humidity

7.2°

Feels 3.8°

Good

Air quality is satisfactory. Enjoy outdoor activities.

1 station

Nearby Monitoring Stations

AQI Forecast

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Air Quality Index Trend

45h · 23 stn

View full history →

St. 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.

75.0%

Humidity

20.0 km/h

Wind WSW

1026.5 hPa

Pressure

0.0

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

4.3 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for St. Charles?

Temperature & Precipitation

PM2.5 Trend

45h · 23 stations

PM2.54.3 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX0.0

Low

Station readings (1 station within 25 km)

4.3

Median

4.3

Average

4.3

Low

4.3

High

PM2.5 µg/m³ · Model: 6.0 · Bias: +1.7

What is the 7-day forecast for St. Charles?

10-21

24.0° 7.2°

10-22

21.4° 11.3°

10-23

17.9° 7.4°

0.44 mm

10-24

15.9° 10.9°

0.5 mm

10-25

21.3° 7.0°

0.06 mm

10-26

16.7° 12.7°

27.19 mm

10-27

13.5° 8.4°

22.19 mm

Both models agree Avg diff: 3.5°C

Where are air quality stations near St. Charles?

Lee District Park - Fairfax County, Northern Virginia, USA

24.2 km PM2.5: 4.3 µg/m³

Lee District Park - Fairfax County, Northern Virginia, USA

24.2 km PM2.5: 4.8 µg/m³

What cities are near St. Charles?

18 Saint Charles 45 Waldorf 30 Fort Washington 31 Clinton 28 Fort Hunt 23 Hybla Valley 38 Oxon Hill-Glassmanor 31 Camp Springs 42 Oxon Hill 54 Glassmanor

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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 2026-10-21T04:23 UTC.