City report · Taiwan
Chiayi City
Measured across a 2 km radius around Chiayi, West District, Chiayi City, Taiwan 600 (12.57 km²)
- Tree cover
- 17.9%
- Air quality
- 55Moderate
- Trees in this area
- 56.2K
- More trees needed
- 38.0K
- Area analyzed
- 12.57 km²
- Satellite image
- Sep 6, 2026
Chiayi City's tree count comes to 56,235 trees across 12.57 km² — 12 points below the 30% tree-cover level considered healthy for this area, meaning roughly 38,013 more trees would close the gap. Air quality currently reads AQI 55 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Tree cover detail
Critically low
17.9% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
56,235
Target trees
94,248
More trees needed
38,013
CO₂ if planted / yr
836.3 t
Air quality detail
AQI 55Moderate
Observed Sep 28, 11:00 local time via Open-Meteo / CAMS, US EPA index. Values in µg/m³.
Model estimate · no ground station nearby
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
14.2
PM10
19.1
NO₂
7.8
O₃
114.0
SO₂
17.2
CO
319.0
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Frequently asked
Questions about Chiayi City
What is the tree count in Chiayi City?
Chiayi City has an estimated 56,235 trees across the 12.57 km² measured — 17.9% tree cover, 12 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Chiayi City need?
Chiayi City needs roughly 38,013 more trees to close a 12-point shortfall against its 30% tree-cover target — about 836.3 t of extra CO₂ absorbed per year once grown.
What is the air quality (AQI) in Chiayi City right now?
The latest reading for Chiayi City shows an AQI of 55 (Moderate), observed Sep 28, 11:00 local time via Open-Meteo / CAMS, US EPA index. Unusually sensitive people should consider limiting long outdoor exertion.
How is Chiayi City'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 Chiayi; the tree count is an estimate derived from that cover. Air quality comes from ground monitoring stations via OpenAQ where one reports nearby, and otherwise, as here, from the Open-Meteo / CAMS model, which may differ from street-level monitors.
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