Today | Weather | Thursday, December 4, 2025

Weather in Somerville, Massachusetts

05:04 AM
Now
Cloudy Night
32° F
Feels Like 25°
Precipitation 0 %
Wind 8 mph
Humidity 71 %
Today
Snowy Weather
Day 39°
Night 10°
Precipitation 55 %
Wind 18 mph
UV Index (0 - 11+) 1

Somerville Weather Forecast Updated

Last updated on

Air Quality in Somerville

NOW
55 AQI
Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 14.13 µg/m³
PM10 19.69 µg/m³
O3 0.022 ppm
NO2 17.6 ppb
SO2 2.5 ppb
CO 0.25 ppm
NH3 0.42 µg/m³
NO 0 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 acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Show raw pollutant concentrations (µg/m³)
PM2.514.13 µg/m³
PM1019.69 µg/m³
O342.3 µg/m³
NO233.2 µg/m³
SO26.59 µg/m³
CO287.19 µg/m³
NH30.42 µg/m³
NO0 µg/m³