Air Quality in Chelmsford, United States
Windy
25.4°C · 34.3% humidity
25.4°
Feels 25.4°
47
Good
Air quality is satisfactory. Enjoy outdoor activities.
Calibrated model
Nearby Monitoring Stations
Chelmsford's air quality — share it
AQI Forecast
25
5pm
27
27
47
8pm
41
37
34
11pm
32
31
30
2am
29
28
28
5am
28
35
34
8am
27
27
27
11am
27
27
27
2pm
27
27
Air Quality Index Trend
46h · 6 stnChelmsford's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.
34.3%
Humidity
54.6 km/h
Wind WNW
1009.1 hPa
Pressure
2.2
UV Moderate
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
11.16 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for Chelmsford?
Temperature & Precipitation
PM2.5 Trend
46h · 6 stationsPM2.511.16 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX2.2
Moderate
What is the 7-day forecast for Chelmsford?
08-03
25.4° 17.4°
0.62 mm
08-04
37.3° 17.6°
08-05
34.0° 20.9°
0.56 mm
08-06
29.1° 16.3°
0.31 mm
08-07
31.6° 20.3°
7.25 mm
08-08
27.0° 18.6°
0.06 mm
08-09
39.2° 21.7°
0.06 mm
Both models agree
Avg diff: 3.7°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 2026-08-08T00:42 UTC.