City report · United States
El Cajon
Measured across a 2 km radius around El Cajon, CA, USA (12.57 km²)
- Tree cover
- 2.9%
- Air quality
- 54Moderate
- Trees in this area
- 9.1K
- More trees needed
- 85.1K
- Area analysed
- 12.57 km²
- Satellite image
- Sep 19, 2026
El Cajon's tree count comes to 9,111 trees across 12.57 km² — 27 points below the 30% tree-cover level considered healthy for this area, meaning roughly 85,137 more trees would close the gap. Air quality currently reads AQI 54 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Tree cover detail
Critically low
2.9% tree cover against a 30% healthy-neighbourhood target, across 12.57 km².
Trees in this area
9,111
Target trees
94,248
More trees needed
85,137
CO₂ if planted / yr
1,873 t
Air quality detail
AQI 54Moderate
Observed Sep 21, 16:00 local time via Open-Meteo / CAMS. Values in µg/m³.
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
10.4
PM10
14.9
NO₂
1.6
O₃
120.0
SO₂
0.9
CO
141.0
Frequently asked
Questions about El Cajon
What is the tree count in El Cajon?
El Cajon has an estimated 9,111 trees across the 12.57 km² measured — 2.9% tree cover, 27 percentage points short of the 30% tree-cover target set for this area.
How many more trees does El Cajon need?
El Cajon needs roughly 85,137 more trees to close a 27-point shortfall against its 30% tree-cover target — about 1,873 t of extra CO₂ absorbed per year once grown.
What is the air quality (AQI) in El Cajon right now?
The latest reading for El Cajon shows an AQI of 54 (Moderate), observed Sep 21, 16:00 local time via Open-Meteo / CAMS. Unusually sensitive people should consider limiting long outdoor exertion.
How is El Cajon's tree cover and air quality measured?
Tree cover is measured from Sentinel-2 L2A (ESA Copernicus) via Earth Search satellite imagery at 10 m detail across a 2 km radius around El Cajon; the tree count is an estimate derived from that cover. Air-quality readings come from Open-Meteo / CAMS and may differ from street-level monitors.
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