Air Quality in Chelmsford, United States
Drizzle
18.4°C · 49.2% humidity
18.4°
Feels 18.4°
15
Good
Air quality is satisfactory. Enjoy outdoor activities.
1 station
Nearby Monitoring Stations
Chelmsford's air quality — share it
AQI Forecast
25
3pm
27
27
15
6pm
18
20
21
9pm
22
23
26
12am
26
26
27
3am
27
27
34
6am
27
27
24
9am
24
24
24
12pm
24
25
Air Quality Index Trend
47h · 2 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.
49.2%
Humidity
42.4 km/h
Wind W
1019.5 hPa
Pressure
1.4
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
3.74 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for Chelmsford?
Temperature & Precipitation
PM2.5 Trend
47h · 2 stationsPM2.53.74 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX1.4
Low
Station readings (1 station within 25 km)
3.74
Median
3.74
Average
3.74
Low
3.74
High
PM2.5 µg/m³ · Model: 5.9 · Bias: +2.2
What is the 7-day forecast for Chelmsford?
05-28
23.7° 16.6°
05-29
19.3° 10.3°
0.25 mm
05-30
24.7° 8.5°
6.75 mm
05-31
25.2° 9.6°
0.31 mm
06-01
24.5° 8.1°
06-02
19.4° 12.3°
0.75 mm
06-03
27.7° 14.9°
Both models agree
Avg diff: 4.8°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 2026-05-28T22:55 UTC.