Air quality in Redwood City
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
14.5 µg/m³
WHO guideline 15
PM10
22 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
2:00 PM
💨
PM2.5 14.5 µg/m³
56Moderate
3:00 PM
💨
PM2.5 13.5 µg/m³
54Moderate
4:00 PM
💨
PM2.5 12.7 µg/m³
52Moderate
5:00 PM
💨
PM2.5 12 µg/m³
50Good
6:00 PM
💨
PM2.5 11.5 µg/m³
48Good
7:00 PM
💨
PM2.5 11.1 µg/m³
46Good
8:00 PM
💨
PM2.5 10.2 µg/m³
43Good
9:00 PM
💨
PM2.5 9.8 µg/m³
41Good
10:00 PM
💨
PM2.5 9.3 µg/m³
39Good
11:00 PM
💨
PM2.5 9.4 µg/m³
39Good
12:00 AM
💨
PM2.5 9.1 µg/m³
38Good
1:00 AM
💨
PM2.5 8.9 µg/m³
37Good
Next few days
daily max · US EPA AQI
Fri
💨
Moderate · UV High
58
Mon
💨
Moderate · UV High
55
Tue
💨
Moderate · UV High
54