City report · United States
San Diego
Measured across a 2 km radius around Downtown San Diego, San Diego, CA, USA (12.57 km²)
- Tree cover
- 6.8%
- Air quality
- 54Moderate
- Trees in this area
- 14.9K
- More trees needed
- 50.7K
- Area analysed
- 8.75 km²land, in a 12.57 km² circle
- Satellite image
- Sep 19, 2026
San Diego's tree count comes to 14,869 trees across 8.75 km² of land — 23 points below the 30% tree-cover level considered healthy for this area, meaning roughly 50,728 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
6.8% tree cover against a 30% healthy-neighbourhood target, across 8.75 km² of land.
Trees in this area
14,869
Target trees
65,597
More trees needed
50,728
CO₂ if planted / yr
1,116 t
Air quality detail
AQI 54Moderate
Observed Sep 21, 20:00 local time via Open-Meteo / CAMS. Values in µg/m³.
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
9.5
PM10
14.1
NO₂
6.2
O₃
83.0
SO₂
0.8
CO
119.0
Frequently asked
Questions about San Diego
What is the tree count in San Diego?
San Diego has an estimated 14,869 trees across the 8.75 km² of land measured — 6.8% tree cover, 23 percentage points short of the 30% tree-cover target set for this area.
How many more trees does San Diego need?
San Diego needs roughly 50,728 more trees to close a 23-point shortfall against its 30% tree-cover target — about 1,116 t of extra CO₂ absorbed per year once grown.
What is the air quality (AQI) in San Diego right now?
The latest reading for San Diego shows an AQI of 54 (Moderate), observed Sep 21, 20:00 local time via Open-Meteo / CAMS. Unusually sensitive people should consider limiting long outdoor exertion.
How is San Diego'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 Downtown San Diego; 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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