What is the air quality in Chelmsford today?

The current Air Quality Index (AQI) in Chelmsford is 23 (Good). PM2.5 concentration is 5.43 µg/m³.

What is the temperature in Chelmsford right now?

The current temperature in Chelmsford is 15.1°C (feels like 15.1°C). Humidity is 41.0% and wind speed is 39.9 km/h.

Is it safe to go outside in Chelmsford?

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

Air Quality in Chelmsford, United States

Clear

15.1°C · 41.0% humidity

15.1°

Feels 15.1°

Good

Air quality is satisfactory. Enjoy outdoor activities.

Calibrated model

Nearby Monitoring Stations

AQI Forecast

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Air Quality Index Trend

46h · 5 stn

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Chelmsford's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.

41.0%

Humidity

39.9 km/h

Wind W

1021.0 hPa

Pressure

0.0

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

5.43 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for Chelmsford?

Temperature & Precipitation

PM2.5 Trend

46h · 5 stations

PM2.55.43 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX0.0

Low

What is the 7-day forecast for Chelmsford?

10-20

15.1° 6.2°

12.81 mm

10-21

19.8° 4.7°

10-22

17.4° 5.4°

4.88 mm

10-23

14.3° 3.8°

10-24

11.6° 8.6°

10-25

21.0° 6.0°

34.69 mm

10-26

11.2° 3.9°

2.44 mm

Both models agree Avg diff: 4.3°C

Where are air quality stations near Chelmsford?

Park/Lawrence

21.0 km PM2.5: 9.3 µg/m³

What cities are near Chelmsford?

26 Lowell 22 Westford 20 Billerica 36 Dracut 22 Tewksbury 19 Acton 36 Methuen 36 Nashua 24 North Andover 17 Woburn

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ModerateAQI > 50 Unhealthy for Sensitive GroupsAQI > 100 UnhealthyAQI > 150 Very UnhealthyAQI > 200

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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 2026-10-20T20:58 UTC.