Air quality in Castro Valley
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
14.8 µg/m³
WHO guideline 15
PM10
15.6 µg/m³
WHO guideline 45
Hour by hour (12h) US EPA AQI
9:00 AM
💨
PM2.5 14.8 µg/m³
57 Moderate
10:00 AM
💨
PM2.5 12.2 µg/m³
51 Moderate
11:00 AM
💨
PM2.5 11.1 µg/m³
46 Good
12:00 PM
💨
PM2.5 10.8 µg/m³
45 Good
1:00 PM
💨
PM2.5 11 µg/m³
46 Good
2:00 PM
💨
PM2.5 10.4 µg/m³
45 Good
3:00 PM
💨
PM2.5 10 µg/m³
47 Good
4:00 PM
💨
PM2.5 10.4 µg/m³
48 Good
5:00 PM
💨
PM2.5 11.5 µg/m³
48 Good
6:00 PM
💨
PM2.5 12.9 µg/m³
53 Moderate
7:00 PM
💨
PM2.5 14.1 µg/m³
55 Moderate
8:00 PM
💨
PM2.5 16.2 µg/m³
60 Moderate
Next few days daily max · US EPA AQI
Wed
💨
Moderate · UV Moderate
77
Thu
💨
Moderate · UV Moderate
81
Fri
💨
Moderate · UV Moderate
83
Sat
💨
Moderate · UV Moderate
81
Sun
💨
Moderate · UV High
55
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Precip NEXRAD · NOAA Temp Wind Clouds Terrain