What is the air quality in Castro Valley today?

The current Air Quality Index (AQI) in Castro Valley is 18 (Good). PM2.5 concentration is 4.25 µg/m³.

What is the temperature in Castro Valley right now?

The current temperature in Castro Valley is 21.2°C (feels like 21.2°C). Humidity is 53.5% and wind speed is 38.5 km/h.

Is it safe to go outside in Castro Valley?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0.0 (Low).

Air Quality in Castro Valley, United States

Partly Cloudy

21.2°C · 53.5% humidity

21.2°

Feels 21.2°

Good

Air quality is satisfactory. Enjoy outdoor activities.

58 stations

Nearby Monitoring Stations

AQI Forecast

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Air Quality Index Trend

46h · 103 stn

View full history →

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.

53.5%

Humidity

38.5 km/h

Wind WSW

1014.0 hPa

Pressure

0.0

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

4.25 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for Castro Valley?

Temperature & Precipitation

PM2.5 Trend

46h · 103 stations

PM2.54.25 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX0.0

Low

Station readings (58 stations within 25 km)

4.25

Median

4.24

Average

3.21

Low

5.89

High

PM2.5 µg/m³ · Model: 6.0 · Bias: +1.8

Both models agree Avg diff: 5.1°C

Where are air quality stations near Castro Valley?

Grass Valley ES

7.4 km PM2.5: 4.3 µg/m³

Madison Park Academy HS

8.8 km PM2.5: 4.2 µg/m³

Reach Academy ES

8.9 km PM2.5: 3.2 µg/m³

Esperanza ES

9.1 km PM2.5: 4.4 µg/m³

Elmhurst United MS

9.1 km PM2.5: 4.0 µg/m³

Oakland - East, Alameda, California

9.1 km PM2.5: 11.0 µg/m³

Oakland Academy of Knowledge (OAK) ES

9.5 km PM2.5: 4.4 µg/m³

Lifers 98th

9.6 km PM2.5: 4.8 µg/m³

Castlemont High School

9.9 km PM2.5: 4.0 µg/m³

Brookfield ES

10.2 km PM2.5: 4.7 µg/m³

What cities are near Castro Valley?

18 Hayward 18 San Lorenzo 18 San Leandro 18 San Ramon 18 Moraga 18 Alameda 15 Pleasanton 18 Oakland 18 Orinda 18 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 2026-10-21T00:35 UTC.