Air Quality in Castro Valley, United States

Clear
26.5°C · 31.9% humidity
26.5°
Feels 26.5°
68
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
Model forecast

Nearby Monitoring Stations

AQI Forecast
54 4pm
54
54
68 7pm
64
61
59 10pm
58
57
56 1am
55
55
55 4am
54
54
54 7am
54
54
34 10am
34
34
54 1pm
54
54
AD 728×90

Air Quality Index Trend

45h · 104 stn

Castro Valley's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration. Current PM2.5 concentration in Castro Valley is 1.4× the WHO 24-hour guideline of 15 µg/m³.

31.9%
Humidity
28.1 km/h
Wind SW
1010.6 hPa
Pressure
17.4
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
68
20.3 µg/m³
PM10
56
66.15 µg/m³
050100150200300500

What is the weather forecast for Castro Valley?

Temperature & Precipitation

PM2.5 Trend

45h · 104 stations
PM2.520.3 µg/m³ ×1.4 WHO
Moderate
PM1066.15 µg/m³
Moderate
UV INDEX17.4
Extreme
AD 300×250

What is the 7-day forecast for Castro Valley?

08-03
29.2° 12.9°
08-04
24.2° 12.9°
08-05
32.3° 11.6°
08-06
30.4° 11.9°
08-07
26.7° 14.0°
08-08
28.9° 13.8°
08-09
33.0° 11.9°
Both models agree Avg diff: 3.1°C

Where are air quality stations near Castro Valley?

51
Grass Valley ES
7.4 km PM2.5: 12.2 µg/m³
33
Madison Park Academy HS
8.8 km PM2.5: 8.0 µg/m³
35
Esperanza ES
9.1 km PM2.5: 8.4 µg/m³
25
Elmhurst United MS
9.1 km PM2.5: 6.1 µg/m³
25
Oakland - East, Alameda, California
9.1 km PM2.5: 6.0 µg/m³
44
Lifers 105th
9.2 km PM2.5: 10.5 µg/m³
45
Oakland Academy of Knowledge (OAK) ES
9.5 km PM2.5: 10.7 µg/m³
59
Lifers 98th
9.6 km PM2.5: 16.0 µg/m³
42
Rudsdale Continuation HS
9.9 km PM2.5: 10.2 µg/m³
34
Castlemont High School
9.9 km PM2.5: 8.2 µg/m³

What cities are near Castro Valley?

68 Hayward 69 San Lorenzo 96 San Leandro 68 San Ramon 96 Moraga 4 Alameda 54 Pleasanton 4 Oakland 96 Orinda 64 Foster City
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Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-08-08T02:08 UTC.