City report · United States
San Francisco
Measured across a 2 km radius around SoMa, San Francisco, CA, USA (12.57 km²)
- Tree cover
- 6.0%
- Air quality
- 51Moderate
- Trees in this area
- 18.8K
- More trees needed
- 75.3K
- Area analysed
- 12.56 km²land, in a 12.57 km² circle
- Satellite image
- Sep 12, 2026
San Francisco's tree count comes to 18,831 trees across 12.56 km² of land — 24 points below the 30% tree-cover level considered healthy for this area, meaning roughly 75,323 more trees would close the gap. Air quality currently reads AQI 51 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Tree cover detail
Critically low
6.0% tree cover against a 30% healthy-neighbourhood target, across 12.56 km² of land.
Trees in this area
18,831
Target trees
94,154
More trees needed
75,323
CO₂ if planted / yr
1,657 t
Air quality detail
AQI 51Moderate
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
9.6
PM10
15.4
NO₂
5.4
O₃
64.0
SO₂
0.8
CO
117.0
Frequently asked
Questions about San Francisco
What is the tree count in San Francisco?
San Francisco has an estimated 18,831 trees across the 12.56 km² of land measured — 6.0% tree cover, 24 percentage points short of the 30% tree-cover target set for this area.
How many more trees does San Francisco need?
San Francisco needs roughly 75,323 more trees to close a 24-point shortfall against its 30% tree-cover target — about 1,657 t of extra CO₂ absorbed per year once grown.
What is the air quality (AQI) in San Francisco right now?
The latest reading for San Francisco shows an AQI of 51 (Moderate), observed Sep 21, 20:00 local time via Open-Meteo / CAMS. Unusually sensitive people should consider limiting long outdoor exertion.
How is San Francisco'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 SoMa; 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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