City report · United States
Boston
Measured across a 2 km radius around Downtown, Boston, MA, USA (12.57 km²)
- Tree cover
- 20.4%
- Air quality
- 40Good
- Trees in this area
- 43.6K
- More trees needed
- 20.5K
- Area analysed
- 8.56 km²land, in a 12.57 km² circle
- Satellite image
- Sep 18, 2026
Boston's tree count comes to 43,644 trees across 8.56 km² of land — 10 points below the 30% tree-cover level considered healthy for this area, meaning roughly 20,538 more trees would close the gap. Air quality currently reads AQI 40 (Good): Air quality is satisfactory for everyone.
Tree cover detail
Below target
20.4% tree cover against a 30% healthy-neighbourhood target, across 8.56 km² of land.
Trees in this area
43,644
Target trees
64,182
More trees needed
20,538
CO₂ if planted / yr
451.8 t
Air quality detail
AQI 40Good
Observed Sep 21, 19:00 local time via Open-Meteo / CAMS. Values in µg/m³.
Health signal
Air quality is satisfactory for everyone.
PM2.5
6.4
PM10
7.4
NO₂
18.5
O₃
64.0
SO₂
1.3
CO
204.0
Frequently asked
Questions about Boston
What is the tree count in Boston?
Boston has an estimated 43,644 trees across the 8.56 km² of land measured — 20.4% tree cover, 10 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Boston need?
Boston needs roughly 20,538 more trees to close a 10-point shortfall against its 30% tree-cover target — about 451.8 t of extra CO₂ absorbed per year once grown.
What is the air quality (AQI) in Boston right now?
The latest reading for Boston shows an AQI of 40 (Good), observed Sep 21, 19:00 local time via Open-Meteo / CAMS. Air quality is satisfactory for everyone.
How is Boston'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; 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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