San Tung Chung Hang vs Shenzhen
Tree cover and air quality for both, measured the same way: Sentinel-2 imagery at 10 m detail over a 2 km radius from each city centre, and the live US EPA air quality index. Same radius and same index, so the two numbers compare directly.
San Tung Chung Hang has more tree cover — 81.8% against 37.8%.
Shenzhen has cleaner air right now — AQI 56 against 70.
- Tree cover gap
- 44.0 points
- San Tung Chung Hang is ahead.
- Air quality gap
- 14 AQI
- Shenzhen is cleaner.
- Trees between them
- 110K
- San Tung Chung Hang has more standing.
Hong Kong
China
Tree cover
Share of the 2 km radius under canopy.
81.8%
37.8%
Air quality index
US EPA index, live, with its band. Lower is better.
70 · Moderate
56 · Moderate
Trees standing
Estimated from the measured canopy area.
229K
119K
Trees still needed
To reach the same canopy target. Fewer is better.
0
0
CO₂ absorbed each year
By the trees already standing.
5.0M kg
2.6M kg
Air quality in detail
What each city is breathing
Concentrations in µg/m³, measured at the same moment as the index above. Lower is better in every row. San Tung Chung Hang is read from nearby ground stations and Shenzhen is modelled — worth knowing, since the two are not quite like for like.
PM2.5
Fine particles, the pollutant that usually sets the index.
21 µg/m³
14.7 µg/m³
The last week, day by day
A single reading can catch a city on a bad afternoon. The week says whether it was the weather or the place.
| Day | San Tung Chung Hang | Shenzhen |
|---|---|---|
| 22 Sept | 127 | 127 |
| 23 Sept | 105 | 105 |
| 24 Sept | 94 | 94 |
| 25 Sept | 99 | 99 |
| 26 Sept | 102 | 102 |
| 27 Sept | 69 | 69 |
| 28 Sept | 51 | 50 |
Reading these numbers
What is actually being measured
Tree cover
The share of ground under canopy inside a 2 km radius of each city centre, read from Sentinel-2 satellite imagery at 10 m detail. It is a measurement of that circle, not of the whole municipality — which is exactly what makes the two comparable, since city boundaries are drawn to wildly different rules around the world. San Tung Chung Hang leads here at 81.8%.
Air quality index
The live US EPA index, computed from current pollutant concentrations — ground stations where a city has them nearby, and a model everywhere else. It moves hour to hour, so this is a snapshot rather than a verdict on either place: San Tung Chung Hang reads 70 (moderate) and Shenzhen reads 56 (moderate) right now.
Frequently asked
San Tung Chung Hang and Shenzhen, answered
Which has more trees, San Tung Chung Hang or Shenzhen?
San Tung Chung Hang, with roughly 228,714 trees inside its 2 km radius against 118,752. Tree cover tells a slightly different story from raw count: San Tung Chung Hang has the denser canopy at 81.8%.
Which has better air quality, San Tung Chung Hang or Shenzhen?
Shenzhen right now, at AQI 56 against 70 — a gap of 14 points. This is a live reading rather than an annual average, so it can reverse within a day.
How many more trees does each city need?
San Tung Chung Hang needs about 0 more to reach its canopy target, and Shenzhen about 0. The target is the same share of ground for both, so the figures are directly comparable.
Are these two measured the same way?
Yes — that is the point of the page. Identical radius, identical satellite source at 10 m detail, and the same US EPA index for air. Nothing here is adjusted for population, city limits or climate, so the numbers describe the same-sized circle of ground in each place.
Keep going
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