Air Quality in Castro Valley, United States

Clear
23.5°C · 30.5% humidity
23.5°
Feels 23.5°
22
Good
Air quality is satisfactory. Enjoy outdoor activities.
62 stations

Nearby Monitoring Stations

AQI Forecast
27 6am
27
27
22 9am
23
24
25 12pm
26
26
26 3pm
27
27
27 6pm
27
27
27 9pm
27
27
27 12am
27
27
27 3am
27
27
AD 728×90

Air Quality Index Trend

48h · 1 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.

30.5%
Humidity
15.8 km/h
Wind SSW
1013.3 hPa
Pressure
5.9
UV High
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
22
5.35 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

What is the weather forecast for Castro Valley?

Temperature & Precipitation

PM2.5 Trend

48h · 1 station
PM2.55.35 µg/m³ ✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX5.9
High
AD 300×250
Station readings (62 stations within 25 km)
5.35
Median
5.21
Average
2.33
Low
7.97
High
PM2.5 µg/m³ · Model: 6.5 · Bias: +1.1

What is the 7-day forecast for Castro Valley?

05-29
23.5° 9.7°
05-30
19.9° 12.2°
05-31
28.5° 16.6°
06-01
28.3° 11.5°
06-02
22.1° 10.2°
06-03
27.8° 7.4°
06-04
30.4° 9.0°
Both models agree Avg diff: 3.8°C

Where are air quality stations near Castro Valley?

21
Grass Valley ES
7.4 km PM2.5: 5.0 µg/m³
20
Madison Park Academy HS
8.8 km PM2.5: 4.9 µg/m³
25
Esperanza ES
9.1 km PM2.5: 5.9 µg/m³
26
Elmhurst United MS
9.1 km PM2.5: 6.2 µg/m³
17
Oakland - East, Alameda, California
9.1 km PM2.5: 4.1 µg/m³
54
Oakland - East, Alameda, California
9.1 km PM2.5: 13.5 µg/m³
25
Lifers 105th
9.2 km PM2.5: 6.1 µg/m³
22
Oakland Academy of Knowledge (OAK) ES
9.5 km PM2.5: 5.3 µg/m³
26
Lifers 98th
9.6 km PM2.5: 6.3 µg/m³
22
Rudsdale Continuation HS
9.9 km PM2.5: 5.2 µg/m³

What cities are near Castro Valley?

22 Hayward 23 San Lorenzo 23 San Leandro 22 San Ramon 22 Moraga 22 Alameda 15 Pleasanton 21 Oakland 21 Orinda 22 Foster City
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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-05-29T16:48 UTC.