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
10.4 µg/m³
WHO guideline 15
PM10
10.8 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
11:00 AM
💨
PM2.5 10.4 µg/m³
90Moderate
12:00 PM
💨
PM2.5 9.7 µg/m³
88Moderate
1:00 PM
💨
PM2.5 11.4 µg/m³
85Moderate
2:00 PM
💨
PM2.5 8.9 µg/m³
83Moderate
3:00 PM
💨
PM2.5 8.6 µg/m³
80Moderate
4:00 PM
💨
PM2.5 8.3 µg/m³
71Moderate
5:00 PM
💨
PM2.5 8.2 µg/m³
60Moderate
6:00 PM
💨
PM2.5 8.5 µg/m³
49Good
7:00 PM
💨
PM2.5 9.2 µg/m³
44Good
8:00 PM
💨
PM2.5 10 µg/m³
42Good
9:00 PM
💨
PM2.5 10.1 µg/m³
42Good
10:00 PM
💨
PM2.5 9.9 µg/m³
41Good
Next few days
daily max · US EPA AQI
Thu
💨
Moderate · UV Very high
90
Fri
💨
Unhealthy for Sensitive Groups · UV Very high
104
Sat
💨
Moderate · UV Very high
88
Sun
💨
Moderate · UV High
68