Today | Weather | Tuesday, January 13, 2026

Weather in Somerville, Massachusetts

04:52 PM
Now
Cloudy Night
39° F
Feels Like 34°
Precipitation 0 %
Wind 8 mph
Humidity 60 %
Today
Cloudy Weather
Day 46°
Night 37°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 2

Somerville Weather Forecast Updated

53 minutes ago
Last updated on

Air Quality in Somerville

NOW
45 AQI
Good air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 10.69 µg/m³
PM10 14.86 µg/m³
O3 0.031 ppm
NO2 9.8 ppb
SO2 2.5 ppb
CO 0.19 ppm
NH3 0.2 µg/m³
NO 0.03 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.510.69 µg/m³
PM1014.86 µg/m³
O360.31 µg/m³
NO218.43 µg/m³
SO26.59 µg/m³
CO221.36 µg/m³
NH30.2 µg/m³
NO0.03 µg/m³