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
17.2 µg/m³
WHO guideline 15
PM10
17.4 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
7:00 AM
💨
PM2.5 17.2 µg/m³
62Moderate
8:00 AM
💨
PM2.5 17.5 µg/m³
62Moderate
9:00 AM
💨
PM2.5 15.7 µg/m³
59Moderate
10:00 AM
💨
PM2.5 13.1 µg/m³
55Moderate
11:00 AM
💨
PM2.5 12.2 µg/m³
66Moderate
12:00 PM
💨
PM2.5 12.5 µg/m³
65Moderate
1:00 PM
💨
PM2.5 13.3 µg/m³
63Moderate
2:00 PM
💨
PM2.5 14.1 µg/m³
65Moderate
3:00 PM
💨
PM2.5 14.8 µg/m³
66Moderate
4:00 PM
💨
PM2.5 15.8 µg/m³
65Moderate
5:00 PM
💨
PM2.5 16.7 µg/m³
61Moderate
6:00 PM
💨
PM2.5 17.2 µg/m³
62Moderate
Next few days
daily max · US EPA AQI
Fri
💨
Moderate · UV High
66
Sat
💨
Moderate · UV Very high
66
Sun
💨
Moderate · UV Very high
90
Mon
💨
Unhealthy for Sensitive Groups · UV Very high
103
Tue
💨
No data · UV Very high
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