Koga
Measured across a 2 km radius around Otsutsumi, Koga, Ibaraki 306-0236, Japan (12.57 km²)
- Tree cover
- 27.8%
- Air quality
- 66Moderate
- Trees in this area
- 87.3K
- More trees needed
- 6.9K
- Area analyzed
- 12.57 km²
- Satellite image
- Jul 22, 2026
Koga's tree count comes to 87,336 trees across 12.57 km² — 2 points below the 30% tree-cover level considered healthy for this area, meaning roughly 6,912 more trees would close the gap. Air quality currently reads AQI 66 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Tree cover detail
Below target
27.8% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
87,336
Target trees
94,248
More trees needed
6,912
CO₂ if planted / yr
152.1 t
Air quality detail
AQI 66Moderate
Observed Sep 27, 13:00 local time via Open-Meteo / CAMS, US EPA index. Values in µg/m³.
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
9.0
PM10
9.4
NO₂
3.8
O₃
117.0
SO₂
5.7
CO
135.0
Frequently asked
Questions about Koga
What is the tree count in Koga?
Koga has an estimated 87,336 trees across the 12.57 km² measured — 27.8% tree cover, 2 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Koga need?
Koga needs roughly 6,912 more trees to close a 2-point shortfall against its 30% tree-cover target — about 152.1 t of extra CO₂ absorbed per year once grown.
What is the air quality (AQI) in Koga right now?
The latest reading for Koga shows an AQI of 66 (Moderate), observed Sep 27, 13:00 local time via Open-Meteo / CAMS, US EPA index. Unusually sensitive people should consider limiting long outdoor exertion.
How is Koga'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 Otsutsumi; the tree count is an estimate derived from that cover. Air-quality readings come from Open-Meteo / CAMS, US EPA index and may differ from street-level monitors.
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