Air quality in Watertown
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
10 µg/m³
WHO guideline 15
PM10
10.3 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
6:00 PM
💨
PM2.5 10 µg/m³
65Moderate
7:00 PM
💨
PM2.5 11.9 µg/m³
63Moderate
8:00 PM
💨
PM2.5 13.1 µg/m³
56Moderate
9:00 PM
💨
PM2.5 13.6 µg/m³
54Moderate
10:00 PM
💨
PM2.5 13.6 µg/m³
54Moderate
11:00 PM
💨
PM2.5 13.2 µg/m³
53Moderate
12:00 AM
💨
PM2.5 12.8 µg/m³
52Moderate
1:00 AM
💨
PM2.5 12.3 µg/m³
51Moderate
2:00 AM
💨
PM2.5 11.8 µg/m³
49Good
3:00 AM
💨
PM2.5 11.2 µg/m³
47Good
4:00 AM
💨
PM2.5 10.5 µg/m³
44Good
5:00 AM
💨
PM2.5 9.9 µg/m³
41Good
Next few days
daily max · US EPA AQI
Sun
💨
Moderate · UV High
65
Mon
💨
Moderate · UV High
56
Tue
💨
Moderate · UV Low
53
Thu
💨
Moderate · UV Moderate
51