Air quality in Somerville
The US Air Quality Index (EPA) grades air from 0 to 500 using fine particles (PM2.5/PM10), ozone and nitrogen dioxide. 0-50 is Good, 51-100 Moderate, 101-150 Unhealthy for Sensitive Groups, and anything higher affects everyone.
PM2.5
3 µg/m³
WHO guideline 15
PM10
3.1 µg/m³
WHO guideline 45
Hour by hour (12h) US EPA AQI
2:00 AM
💨
PM2.5 3 µg/m³
16 Good
3:00 AM
💨
PM2.5 2.7 µg/m³
16 Good
4:00 AM
💨
PM2.5 2.5 µg/m³
15 Good
5:00 AM
💨
PM2.5 2.4 µg/m³
14 Good
6:00 AM
💨
PM2.5 3 µg/m³
13 Good
7:00 AM
💨
PM2.5 3.9 µg/m³
16 Good
8:00 AM
💨
PM2.5 3.6 µg/m³
15 Good
9:00 AM
💨
PM2.5 3.1 µg/m³
19 Good
10:00 AM
💨
PM2.5 2.1 µg/m³
22 Good
11:00 AM
💨
PM2.5 1.6 µg/m³
25 Good
12:00 PM
💨
PM2.5 1.3 µg/m³
26 Good
1:00 PM
💨
PM2.5 1.2 µg/m³
28 Good
Next few days daily max · US EPA AQI
Tue
💨
Moderate · UV Low
52
Wed
💨
Moderate · UV Low
66
Thu
💨
Moderate · UV Moderate
62
JavaScript is needed for the map — the city links below work without it.
Precip NEXRAD · NOAA Temp Wind Clouds Terrain