Air Quality in Somerville, United States

Drizzle
18.8°C · 91.7% humidity
18.8°
Feels 18.8°
66
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
2 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
72 10am
72
52
66 1pm
62
59
57 4pm
56
55
54 7pm
53
53
46 10pm
45
43
43 1am
42
42
42 4am
42
42
42 7am
42
42
Station readings
85
68
60
CAMS model adj +18
54
54
34
34
34
34
34
34
34
34
34
34
27
27
25
25
24
24
24
24
24
24
24
24
AD 728×90

Air Quality Index Trend

47h · 1 stn

Somerville'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 Somerville is 1.3× the WHO 24-hour guideline of 15 µg/m³.

91.7%
Humidity
61.5 km/h
Wind NE
1014.1 hPa
Pressure
19.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
66
19.31 µg/m³
PM10
25
27.4 µg/m³
050100150200300500

What is the weather forecast for Somerville?

Temperature & Precipitation

PM2.5 Trend

47h · 1 station
PM2.519.31 µg/m³ ×1.3 WHO
Moderate
PM1027.4 µg/m³
Good
UV INDEX19.9
Extreme
AD 300×250
Station readings (2 stations within 25 km)
19.31
Median
17.0
Average
12.45
Low
21.55
High
PM2.5 µg/m³ · Model: 10.85 · Bias: -8.5

What is the 7-day forecast for Somerville?

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 Somerville?

60
Magazine Beach Park
3.8 km PM2.5: 16.4 µg/m³ PM10: 16.8 µg/m³
14
Boston
4.6 km PM2.5: 3.4 µg/m³
37
Boston
4.6 km PM2.5: 8.9 µg/m³
52
Nubian Square - DEP Station
6.6 km PM2.5: 12.8 µg/m³
9
Boston Roxbury
6.6 km PM2.5: 2.2 µg/m³
38
Milton Blue Hill Observatory
19.6 km PM2.5: 9.1 µg/m³

What cities are near Somerville?

68 Cambridge 62 Charlestown 65 Medford 70 Allston 61 Back Bay 63 Everett 59 Boston 64 Fenway/Kenmore 63 Malden 61 East Boston
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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 2026-07-21T17:13 UTC.