Air Quality in Chelmsford, United States

Windy
6.6°C · 57.2% humidity
6.6°
Feels 0.7°
19
Good
Air quality is satisfactory. Enjoy outdoor activities.
1 station

Nearby Monitoring Stations

AQI Forecast Calibrated
20 10pm
18
20
32 1am
32
32
32 4am
32
32
32 7am
32
32
32 10am
45
45
70 1pm
45
45
45 4pm
32
32
32 7pm
32
32
Station readings
20
18
CAMS model adj -5
25
25
25
37
37
37
37
37
37
37
37
37
37
50
50
75
50
50
50
37
37
37
37
37
AD 728×90

PM2.5 Trend (24h)

22h · 2 stations
57.2%
Humidity
52.3 km/h
Wind SSW
1031.3 hPa
Pressure
2.2
UV Moderate
GoodModerateUSGUnhealthyVery UnhealthyHazardous

What is the weather forecast for Chelmsford?

Temperature & Precipitation

PM2.54.5 µg/m³ ✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX2.2
Moderate
AD 300×250
Station readings (1 station within 25 km)
4.5
Median
4.5
Average
4.5
Low
4.5
High
PM2.5 µg/m³ · Model: 23.4 · Bias: +18.9

What is the 7-day forecast for Chelmsford?

04-10
19.3° 2.3°
04-11
22.4° 7.1°
04-12
17.9° 5.8°
04-13
13.1° 9.1°
2.62 mm
04-14
25.6° 13.9°
0.06 mm
04-15
22.8° 19.8°
0.75 mm
04-16
13.0° 7.1°
0.13 mm
Both models agree Avg diff: 3.9°C

Where are air quality stations near Chelmsford?

18
Park/Lawrence
21.0 km PM2.5: 4.4 µg/m³

What cities are near Chelmsford?

19 Lowell 28 Westford 19 Billerica 19 Dracut 19 Tewksbury 28 Acton 19 Methuen 10 Nashua 19 North Andover 19 Woburn

Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-04-10T01:01 UTC.