Air quality in Walnut
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
24.1 µg/m³
WHO guideline 15
PM10
26.8 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
1:00 AM
💨
PM2.5 24.1 µg/m³
76Moderate
2:00 AM
💨
PM2.5 24.4 µg/m³
77Moderate
3:00 AM
💨
PM2.5 24.6 µg/m³
77Moderate
4:00 AM
💨
PM2.5 25.7 µg/m³
80Moderate
5:00 AM
💨
PM2.5 26.7 µg/m³
82Moderate
6:00 AM
💨
PM2.5 27.5 µg/m³
83Moderate
7:00 AM
💨
PM2.5 27.8 µg/m³
84Moderate
8:00 AM
💨
PM2.5 27.2 µg/m³
83Moderate
9:00 AM
💨
PM2.5 23.7 µg/m³
75Moderate
10:00 AM
💨
PM2.5 22.8 µg/m³
74Moderate
11:00 AM
💨
PM2.5 22.2 µg/m³
72Moderate
12:00 PM
💨
PM2.5 21.5 µg/m³
90Moderate
Next few days
daily max · US EPA AQI
Sat
💨
Unhealthy for Sensitive Groups · UV Very high
106
Sun
💨
Unhealthy for Sensitive Groups · UV Very high
147
Mon
💨
Unhealthy for Sensitive Groups · UV Very high
126
Tue
💨
Moderate · UV Very high
93
Wed
💨
Unhealthy for Sensitive Groups · UV Very high
111