What is the air quality in Acton today?

The current Air Quality Index (AQI) in Acton is 19 (Good). PM2.5 concentration is 4.61 µg/m³.

What is the temperature in Acton right now?

The current temperature in Acton is 15.1°C (feels like 15.1°C). Humidity is 41.5% and wind speed is 39.4 km/h.

Is it safe to go outside in Acton?

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

Air Quality in Acton, United States

Clear

15.1°C · 41.5% 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 · 7 stn

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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.

41.5%

Humidity

39.4 km/h

Wind W

1021.2 hPa

Pressure

0.0

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

4.61 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for Acton?

Temperature & Precipitation

PM2.5 Trend

46h · 7 stations

PM2.54.61 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX0.0

Low

What is the 7-day forecast for Acton?

10-20

15.1° 6.0°

13.5 mm

10-21

19.4° 4.5°

10-22

18.4° 5.0°

3.69 mm

10-23

14.9° 3.5°

10-24

10.9° 8.2°

10-25

19.2° 6.6°

38.5 mm

10-26

11.2° 4.1°

3.31 mm

Both models agree Avg diff: 4.3°C

What cities are near Acton?

22 Westford 17 Sudbury 23 Chelmsford 20 Billerica 17 Marlborough 26 Lowell 16 Waltham 3 Framingham Center 22 Tewksbury 3 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 2026-10-20T20:56 UTC.