Air Quality in Chelmsford, United States
Cloudy
13.0°C · 74.1% humidity
13.0°
Feels 13.0°
23
Good
Air quality is satisfactory. Enjoy outdoor activities.
1 station
Nearby Monitoring Stations
Chelmsford's air quality — share it
AQI Forecast
34
10pm
34
54
23
1am
32
38
43
4am
46
48
50
7am
31
25
23
10am
24
24
24
1pm
25
25
25
4pm
25
25
25
7pm
25
34
Air Quality Index Trend
47h · 1 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.
74.1%
Humidity
14.5 km/h
Wind WSW
999.6 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
5.48 µg/m³
PM10
20.55 µg/m³
050100150200300500
What is the weather forecast for Chelmsford?
Temperature & Precipitation
PM2.5 Trend
47h · 1 stationPM2.55.48 µg/m³
✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX0.7
Low
Station readings (1 station within 25 km)
5.48
Median
5.48
Average
5.48
Low
5.48
High
PM2.5 µg/m³ · Model: 9.75 · Bias: +4.3
What is the 7-day forecast for Chelmsford?
06-09
34.0° 13.0°
06-10
22.2° 11.6°
5.0 mm
06-11
26.2° 10.0°
06-12
21.1° 14.8°
1.75 mm
06-13
30.8° 16.5°
0.81 mm
06-14
24.6° 9.1°
16.06 mm
06-15
26.6° 14.3°
1.19 mm
Both models agree
Avg diff: 7.1°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 2026-06-09T05:58 UTC.