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Airleaf
Aerial study of a dense urban district organized around a green corridor
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City report · Taiwan

Chang-hua

Measured across a 2 km radius around Changhua City, Dazhu Village, Xihu Township, Changhua County, Taiwan 500 (12.57 km²)

Tree cover
62.7%
Air quality
59Moderate
Trees in this area
197K
More trees needed
0
Area analyzed
12.57 km²
Satellite image
Sep 26, 2026
Dark green marks tree cover detected inside the study radius.Sentinel-2 L2A (ESA Copernicus) via Earth Search, captured Sep 26, 2026

Chang-hua's tree count comes to 196,978 trees across 12.57 km² — already at or above the 30% tree-cover level considered healthy for this area. Air quality currently reads AQI 59 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.

Tree cover detail

Healthy tree cover

62.7% tree cover against a 30% healthy-neighborhood target, across 12.57 km².

Target reached

Trees in this area

196,978

Target trees

196,978

More trees needed

0

CO₂ if planted / yr

0 kg

Air quality detail

AQI 59Moderate

Observed Sep 28, 10:00 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

16.0

PM10

20.4

NO₂

20.9

O₃

64.0

SO₂

32.6

CO

223.0

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Chang-hua tree cover and air quality — measured by Airleaf
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Frequently asked

Questions about Chang-hua

What is the tree count in Chang-hua?

Chang-hua has an estimated 196,978 trees across the 12.57 km² measured — 62.7% tree cover, already past the 30% tree-cover target set for this area.

How many more trees does Chang-hua need?

Chang-hua has already reached its tree-cover target, so no additional trees are needed to close the gap.

What is the air quality (AQI) in Chang-hua right now?

The latest reading for Chang-hua shows an AQI of 59 (Moderate), observed Sep 28, 10:00 local time via Open-Meteo / CAMS, US EPA index. Unusually sensitive people should consider limiting long outdoor exertion.

How is Chang-hua'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 Changhua City; 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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Methodology. Tree cover is measured from Sentinel-2 L2A (ESA Copernicus) via Earth Search imagery at 10 m detail for the stated radius; 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.