Air Quality in Chelsea, United States
Drizzle
18.8°C · 91.7% humidity
18.8°
Feels 18.8°
51
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
8 stations
Nearby Monitoring Stations
Chelsea's air quality — share it
AQI Forecast
Calibrated
62
1pm
62
62
51
4pm
54
56
58
7pm
59
60
54
10pm
54
52
52
1am
52
52
52
4am
52
52
52
7am
52
52
52
10am
52
52
Station readings
62
65
65
71
CAMS model
adj +28
34
34
34
34
34
34
34
34
34
27
27
25
25
24
24
24
24
24
24
24
24
24
24
24
Air Quality Index Trend
48h · 1 stnChelsea's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.
91.7%
Humidity
61.5 km/h
Wind NE
1014.1 hPa
Pressure
7.9
UV Very High
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
12.2 µg/m³
PM10
20.55 µg/m³
050100150200300500
What is the weather forecast for Chelsea?
Temperature & Precipitation
PM2.5 Trend
48h · 1 stationPM2.512.2 µg/m³
✓ WHO
Moderate
PM1020.55 µg/m³
Good
UV INDEX7.9
Very High
Station readings (8 stations within 25 km)
12.2
Median
12.63
Average
10.6
Low
19.65
High
PM2.5 µg/m³ · Model: 10.85 · Bias: -1.4
What is the 7-day forecast for Chelsea?
07-21
27.2° 18.8°
4.19 mm
07-22
22.7° 14.9°
9.25 mm
07-23
27.7° 16.7°
1.81 mm
07-24
26.5° 14.9°
2.31 mm
07-25
35.5° 20.6°
2.88 mm
07-26
23.5° 17.0°
1.63 mm
07-27
28.8° 14.9°
5.94 mm
Both models agree
Avg diff: 3.6°C
Where are air quality stations near Chelsea?
52
Boston
42
Boston
71
Magazine Beach Park
53
Nubian Square - DEP Station
9
Boston Roxbury
21
Milton Blue Hill Observatory
What cities are near Chelsea?
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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 2026-07-21T20:52 UTC.