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
7.5 µg/m³
WHO guideline 15
PM10
7.6 µg/m³
WHO guideline 45
Hour by hour (12h) US EPA AQI
11:00 PM
💨
PM2.5 7.5 µg/m³
31 Good
12:00 AM
💨
PM2.5 7.8 µg/m³
33 Good
1:00 AM
💨
PM2.5 8.6 µg/m³
36 Good
2:00 AM
💨
PM2.5 9.1 µg/m³
38 Good
3:00 AM
💨
PM2.5 9.4 µg/m³
39 Good
4:00 AM
💨
PM2.5 9.5 µg/m³
40 Good
5:00 AM
💨
PM2.5 9.6 µg/m³
40 Good
6:00 AM
💨
PM2.5 10.7 µg/m³
45 Good
7:00 AM
💨
PM2.5 12.1 µg/m³
51 Moderate
8:00 AM
💨
PM2.5 12.1 µg/m³
51 Moderate
9:00 AM
💨
PM2.5 7.2 µg/m³
30 Good
10:00 AM
💨
PM2.5 3.2 µg/m³
24 Good
Next few days daily max · US EPA AQI
Fri
💨
Moderate · UV Low
53
Sat
💨
Moderate · UV Low
51
Tue
💨
Moderate · UV Low
52
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Precip NEXRAD · NOAA Temp Wind Clouds Terrain