What is the air quality in Acton today?

The current Air Quality Index (AQI) in Acton is 47 (Good). PM2.5 concentration is 11.33 µg/m³.

What is the temperature in Acton right now?

The current temperature in Acton is 18.7°C (feels like 18.7°C). Humidity is 90.3% and wind speed is 60.5 km/h.

Is it safe to go outside in Acton?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 7.9 (Very High).

Air Quality in Acton, United States

Windy

18.7°C · 90.3% humidity

18.7°

Feels 18.7°

Good

Air quality is satisfactory. Enjoy outdoor activities.

Calibrated model

Nearby Monitoring Stations

AQI Forecast

34 1pm

47 4pm

39 7pm

27 10pm

25 1am

24 4am

24 7am

24 10am

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.

90.3%

Humidity

60.5 km/h

Wind NE

1014.0 hPa

Pressure

7.9

UV Very High

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

11.33 µg/m³

PM10

27.45 µg/m³

050100150200300500

What is the weather forecast for Acton?

Temperature & Precipitation

PM2.5 Trend

48h · 2 stations

PM2.511.33 µg/m³ ✓ WHO

Good

PM1027.45 µg/m³

Good

UV INDEX7.9

Very High

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?

42 Westford 64 Sudbury 38 Chelmsford 38 Billerica 43 Marlborough 38 Lowell 55 Waltham 56 Framingham Center 38 Tewksbury 56 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 2026-07-21T20:44 UTC.