Air Quality in El Cajon, United States

Partly Cloudy
17.6°C · 64.9% humidity
17.6°
Feels 17.6°
28
Good
Air quality is satisfactory. Enjoy outdoor activities.
3 stations

Nearby Monitoring Stations

AQI Forecast
25 4am
25
27
28 7am
27
27
27 10am
27
34
34 1pm
34
34
34 4pm
34
27
27 7pm
27
27
27 10pm
27
25
25 1am
25
25
AD 728×90

Air Quality Index Trend

48h · 1 stn

El 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 1.3× the WHO annual guideline of 5 µg/m³.

64.9%
Humidity
14.2 km/h
Wind SW
1011.4 hPa
Pressure
1.4
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
28
6.64 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

What is the weather forecast for El Cajon?

Temperature & Precipitation

PM2.5 Trend

48h · 1 station
PM2.56.64 µg/m³ ✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX1.4
Low
AD 300×250
Station readings (3 stations within 25 km)
6.64
Median
6.4
Average
4.6
Low
8.4
High
PM2.5 µg/m³ · Model: 6.25 · Bias: -0.4

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: 2.8°C

Where are air quality stations near El Cajon?

55
El Cajon-Redwood Avenue, San Diego, California
2.0 km PM2.5: 14.0 µg/m³
50
El Cajon-Redwood Avenue, San Diego, California
2.0 km PM2.5: 12.0 µg/m³
13
Alpine-Victoria Drive, San Diego, California
18.9 km PM2.5: 3.1 µg/m³
21
San Diego - Sherman Elementary School, San Diego, California
19.3 km PM2.5: 5.0 µg/m³
5
San Diego - Sherman Elementary School, San Diego, California
19.3 km PM2.5: 1.2 µg/m³
25
San Diego - Sherman Elementary School, San Diego, California
19.3 km PM2.5: 6.0 µg/m³
17
Otay Mesa - Donovan Correctional Facility, San Diego, California
24.1 km PM2.5: 4.1 µg/m³
17
Otay Mesa - Donovan Correctional Facility, San Diego, California
24.1 km PM2.5: 4.1 µg/m³
34
Otay Mesa - Donovan Correctional Facility, San Diego, California
24.1 km PM2.5: 8.2 µg/m³
26
Otay Mesa - Donovan Correctional Facility, San Diego, California
24.1 km PM2.5: 6.2 µg/m³

What cities are near El Cajon?

29 Bostonia 24 Casa de Oro-Mount Helix 29 Winter Gardens 27 Santee 23 Rancho San Diego 24 La Mesa 24 Spring Valley 26 Lakeside 25 Lemon Grove 23 La Presa
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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 2026-05-29T14:36 UTC.