What is the air quality in Acton today?

The current Air Quality Index (AQI) in Acton is 43 (Good). PM2.5 concentration is 10.39 µg/m³.

What is the temperature in Acton right now?

The current temperature in Acton is 16.4°C (feels like 16.4°C). Humidity is 97.3% and wind speed is 72.9 km/h.

Is it safe to go outside in Acton?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 4.4 (Moderate).

Air Quality in Acton, United States

Rain

16.4°C · 97.3% humidity

16.4°

Feels 16.4°

Good

Air quality is satisfactory. Enjoy outdoor activities.

Calibrated model

Nearby Monitoring Stations

AQI Forecast

34 2pm

43 5pm

30 8pm

26 11pm

24 2am

24 5am

24 8am

24 11am

Air Quality Index Trend

48h · 2 stn

View full history →

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

97.3%

Humidity

72.9 km/h

Wind NNE

1013.1 hPa

Pressure

4.4

UV Moderate

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

10.39 µg/m³

PM10

27.45 µg/m³

050100150200300500

What is the weather forecast for Acton?

Temperature & Precipitation

PM2.5 Trend

48h · 2 stations

PM2.510.39 µg/m³ ✓ WHO

Good

PM1027.45 µg/m³

Good

UV INDEX4.4

Moderate

What is the 7-day forecast for Acton?

07-21

26.4° 18.7°

3.81 mm

07-22

22.0° 14.0°

11.0 mm

07-23

27.6° 15.9°

1.25 mm

07-24

25.9° 14.8°

2.19 mm

07-25

34.8° 20.3°

2.44 mm

07-26

22.4° 16.8°

2.0 mm

07-27

29.2° 14.6°

3.06 mm

Both models agree Avg diff: 3.3°C

What cities are near Acton?

40 Westford 67 Sudbury 40 Chelmsford 40 Billerica 19 Marlborough 40 Lowell 58 Waltham 54 Framingham Center 40 Tewksbury 54 Framingham

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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 2026-07-21T21:27 UTC.