What is the air quality in Chelsea today?

The current Air Quality Index (AQI) in Chelsea is 27 (Good). PM2.5 concentration is 6.52 µg/m³.

What is the temperature in Chelsea right now?

The current temperature in Chelsea is 18.8°C (feels like 18.8°C). Humidity is 38.6% and wind speed is 46.0 km/h.

Is it safe to go outside in Chelsea?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 6.9 (High).

Air Quality in Chelsea, United States

Windy

18.8°C · 38.6% humidity

18.8°

Feels 18.8°

Good

Air quality is satisfactory. Enjoy outdoor activities.

6 stations

Nearby Monitoring Stations

AQI Forecast

24 9am

27 12pm

25 3pm

25 6pm

34 9pm

27 12am

24 3am

24 6am

Air Quality Index Trend

46h · 8 stn

View full history →

Chelsea's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration. Current PM2.5 concentration in Chelsea is 1.3× the WHO annual guideline of 5 µg/m³.

38.6%

Humidity

46.0 km/h

Wind ESE

1021.0 hPa

Pressure

6.9

UV High

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

6.52 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for Chelsea?

Temperature & Precipitation

PM2.5 Trend

46h · 8 stations

PM2.56.52 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX6.9

High

Station readings (6 stations within 25 km)

6.52

Median

6.67

Average

4.6

Low

7.9

High

PM2.5 µg/m³ · Model: 5.8 · Bias: -0.7

What is the 7-day forecast for Chelsea?

05-29

19.2° 11.2°

0.13 mm

05-30

24.5° 9.2°

8.56 mm

05-31

25.5° 10.0°

0.5 mm

06-01

22.7° 8.1°

06-02

20.9° 12.2°

0.44 mm

06-03

27.3° 14.7°

06-04

22.8° 17.5°

0.13 mm

Both models agree Avg diff: 4.8°C

Where are air quality stations near Chelsea?

Boston

4.3 km PM2.5: 4.1 µg/m³

Boston

4.3 km PM2.5: 4.6 µg/m³

Nubian Square - DEP Station

8.0 km PM2.5: 4.6 µg/m³

Boston Roxbury

8.0 km PM2.5: 3.1 µg/m³

Milton Blue Hill Observatory

21.1 km PM2.5: 3.4 µg/m³

What cities are near Chelsea?

27 East Boston 28 Orient Heights 27 Everett 28 Revere 27 Charlestown 28 Boston 27 Winthrop 28 Malden 26 Somerville 26 Cambridge

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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 2026-05-29T16:31 UTC.