Air Quality in Castaic, United States
Windy
32.6°C · 14.0% humidity
32.6°
Feels 32.6°
101
Unhealthy for sensitive groups
Sensitive groups should reduce prolonged outdoor exertion.
1 station
Nearby Monitoring Stations
AQI Forecast
Calibrated
20
2pm
20
20
101
5pm
78
62
50
8pm
41
35
31
11pm
—
—
—
2am
—
—
—
5am
—
—
—
8am
—
—
21
11am
19
17
Station readings
17
17
17
29
CAMS model
adj -14
34
34
34
34
34
34
34
34
34
34
27
27
27
Air Quality Index Trend
40h · 1 stnCastaic'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 Castaic is 7.1× the WHO annual guideline of 5 µg/m³.
14.0%
Humidity
66.6 km/h
Wind WSW
1010.9 hPa
Pressure
5.9
UV High
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
35.5 µg/m³
PM10
20.55 µg/m³
050100150200300500
What is the weather forecast for Castaic?
Temperature & Precipitation
PM2.5 Trend
40h · 1 stationPM2.535.5 µg/m³
×2.4 WHO
Unhealthy for sensitive groups
PM1020.55 µg/m³
Good
UV INDEX5.9
High
Station readings (1 station within 25 km)
35.5
Median
35.5
Average
35.5
Low
35.5
High
PM2.5 µg/m³ · Model: 7.1 · Bias: -28.4
What is the 7-day forecast for Castaic?
05-29
32.6° 14.3°
05-30
20.7° 10.9°
05-31
29.9° 17.2°
06-01
32.6° 12.9°
06-02
29.7° 10.9°
06-03
31.0° 8.1°
06-04
25.8° 12.5°
Both models agree
Avg diff: 5.2°C
Where are air quality stations near Castaic?
25
Santa Clarita-Placerita, Los Angeles
58
Santa Clarita-Placerita, Los Angeles
80
Santa Clarita-Placerita, Los Angeles
34
Santa Clarita-Placerita, Los Angeles
17
Santa Clarita-Placerita, Los Angeles
32
Piru - Pacific, Ventura, California
17
Canyon Creek OEC (1211)
18
Porter Ranch Cmty Sch (2303)
18
Castlebay Ln ES (2881)
20
Van Gogh ES (7422)
What cities are near Castaic?
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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 2026-05-29T00:10 UTC.