Air Quality in El Cajon, United States
Windy
26.7°C · 37.8% humidity
26.7°
Feels 26.7°
55
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
3 stations
Nearby Monitoring Stations
AQI Forecast
34
2pm
34
34
55
5pm
49
45
42
8pm
40
38
37
11pm
36
28
28
2am
28
26
25
5am
27
27
27
8am
27
27
27
11am
34
34
Air Quality Index Trend
46h · 4 stnEl Cajon'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 El Cajon is 2.8× the WHO annual guideline of 5 µg/m³.
37.8%
Humidity
58.2 km/h
Wind WSW
1012.0 hPa
Pressure
5.9
UV High
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
14.21 µg/m³
PM10
20.55 µg/m³
050100150200300500
What is the weather forecast for El Cajon?
Temperature & Precipitation
PM2.5 Trend
46h · 4 stationsPM2.514.21 µg/m³
✓ WHO
Moderate
PM1020.55 µg/m³
Good
UV INDEX5.9
High
Station readings (3 stations within 25 km)
14.21
Median
13.4
Average
6.2
Low
25.4
High
PM2.5 µg/m³ · Model: 7.1 · Bias: -7.1
What is the 7-day forecast for El Cajon?
05-29
28.7° 17.6°
05-30
22.1° 16.3°
05-31
25.9° 19.2°
06-01
28.4° 17.6°
06-02
29.6° 15.6°
06-03
26.2° 14.9°
06-04
25.3° 16.6°
Both models agree
Avg diff: 3.2°C
Where are air quality stations near El Cajon?
40
El Cajon-Redwood Avenue, San Diego, California
37
El Cajon-Redwood Avenue, San Diego, California
44
Alpine-Victoria Drive, San Diego, California
79
San Diego - Sherman Elementary School, San Diego, California
47
San Diego - Sherman Elementary School, San Diego, California
39
San Diego - Sherman Elementary School, San Diego, California
33
Otay Mesa - Donovan Correctional Facility, San Diego, California
29
Otay Mesa - Donovan Correctional Facility, San Diego, California
58
Otay Mesa - Donovan Correctional Facility, San Diego, California
72
Otay Mesa - Donovan Correctional Facility, San Diego, California
What cities are near El Cajon?
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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 2026-05-29T00:19 UTC.