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
AD 728×90

Air Quality Index Trend

40h · 1 stn

Castaic'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▲
101
35.5 µg/m³
PM10
19
20.55 µg/m³
050100150200300500

What is the weather forecast for Castaic?

Temperature & Precipitation

PM2.5 Trend

40h · 1 station
PM2.535.5 µg/m³ ×2.4 WHO
Unhealthy for sensitive groups
PM1020.55 µg/m³
Good
UV INDEX5.9
High
AD 300×250
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
14.6 km PM2.5: 6.0 µg/m³
58
Santa Clarita-Placerita, Los Angeles
14.6 km PM2.5: 15.4 µg/m³
80
Santa Clarita-Placerita, Los Angeles
14.6 km PM2.5: 25.9 µg/m³
34
Santa Clarita-Placerita, Los Angeles
14.6 km PM2.5: 8.2 µg/m³
17
Santa Clarita-Placerita, Los Angeles
14.6 km PM2.5: 4.1 µg/m³
32
Piru - Pacific, Ventura, California
19.6 km PM2.5: 7.7 µg/m³
17
Canyon Creek OEC (1211)
20.9 km PM2.5: 4.1 µg/m³
18
Porter Ranch Cmty Sch (2303)
22.1 km PM2.5: 4.4 µg/m³
18
Castlebay Ln ES (2881)
22.8 km PM2.5: 4.4 µg/m³
20
Van Gogh ES (7422)
23.1 km PM2.5: 4.8 µg/m³

What cities are near Castaic?

69 Valencia 64 Stevenson Ranch 61 Santa Clarita 21 Canyon Country 52 Sylmar 32 Chatsworth 88 Simi Valley 52 San Fernando 31 Fillmore 36 Northridge
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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.