Air quality in Watford
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
4.3 µg/m³
WHO guideline 15
PM10
4.3 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
11:00 AM
💨
PM2.5 4.3 µg/m³
24Good
12:00 PM
💨
PM2.5 3.8 µg/m³
26Good
1:00 PM
💨
PM2.5 3.6 µg/m³
27Good
2:00 PM
💨
PM2.5 3.4 µg/m³
29Good
3:00 PM
💨
PM2.5 3.3 µg/m³
29Good
4:00 PM
💨
PM2.5 3.3 µg/m³
30Good
5:00 PM
💨
PM2.5 3.1 µg/m³
30Good
6:00 PM
💨
PM2.5 2.9 µg/m³
30Good
7:00 PM
💨
PM2.5 2.8 µg/m³
30Good
8:00 PM
💨
PM2.5 2.7 µg/m³
29Good
9:00 PM
💨
PM2.5 2.7 µg/m³
29Good
10:00 PM
💨
PM2.5 2.6 µg/m³
29Good
Next few days
daily max · US EPA AQI
Wed
💨
Moderate · UV High
65