City report · United States
Seattle
Measured across a 2 km radius around Central Business District, Seattle, WA, USA (12.57 km²)
- Tree cover
- 17.3%
- Air quality
- 54Moderate
- Trees in this area
- 42.5K
- More trees needed
- 31.2K
- Area analysed
- 9.83 km²land, in a 12.57 km² circle
- Satellite image
- Sep 16, 2026
Seattle's tree count comes to 42,501 trees across 9.83 km² of land — 13 points below the 30% tree-cover level considered healthy for this area, meaning roughly 31,200 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
17.3% tree cover against a 30% healthy-neighbourhood target, across 9.83 km² of land.
Trees in this area
42,501
Target trees
73,701
More trees needed
31,200
CO₂ if planted / yr
686.4 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
19.6
PM10
19.8
NO₂
41.6
O₃
46.0
SO₂
2.6
CO
220.0
Frequently asked
Questions about Seattle
What is the tree count in Seattle?
Seattle has an estimated 42,501 trees across the 9.83 km² of land measured — 17.3% tree cover, 13 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Seattle need?
Seattle needs roughly 31,200 more trees to close a 13-point shortfall against its 30% tree-cover target — about 686.4 t of extra CO₂ absorbed per year once grown.
What is the air quality (AQI) in Seattle right now?
The latest reading for Seattle 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 Seattle'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 Central Business District; 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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