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
AD 728×90

Air Quality Index Trend

46h · 4 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 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▲
55
14.21 µg/m³
PM10
19
20.55 µg/m³
050100150200300500

What is the weather forecast for El Cajon?

Temperature & Precipitation

PM2.5 Trend

46h · 4 stations
PM2.514.21 µg/m³ ✓ WHO
Moderate
PM1020.55 µg/m³
Good
UV INDEX5.9
High
AD 300×250
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
2.0 km PM2.5: 9.6 µg/m³
37
El Cajon-Redwood Avenue, San Diego, California
2.0 km PM2.5: 8.9 µg/m³
44
Alpine-Victoria Drive, San Diego, California
18.9 km PM2.5: 10.6 µg/m³
79
San Diego - Sherman Elementary School, San Diego, California
19.3 km PM2.5: 25.4 µg/m³
47
San Diego - Sherman Elementary School, San Diego, California
19.3 km PM2.5: 11.3 µg/m³
39
San Diego - Sherman Elementary School, San Diego, California
19.3 km PM2.5: 9.4 µg/m³
33
Otay Mesa - Donovan Correctional Facility, San Diego, California
24.1 km PM2.5: 7.9 µg/m³
29
Otay Mesa - Donovan Correctional Facility, San Diego, California
24.1 km PM2.5: 7.0 µg/m³
58
Otay Mesa - Donovan Correctional Facility, San Diego, California
24.1 km PM2.5: 15.4 µg/m³
72
Otay Mesa - Donovan Correctional Facility, San Diego, California
24.1 km PM2.5: 22.1 µg/m³

What cities are near El Cajon?

65 Bostonia 52 Casa de Oro-Mount Helix 67 Winter Gardens 61 Santee 54 Rancho San Diego 28 La Mesa 43 Spring Valley 79 Lakeside 28 Lemon Grove 30 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 2026-05-29T00:19 UTC.