Tin Shui Wai vs Tseung Kwan O
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.
Tseung Kwan O has more tree cover — 75.0% against 37.4%.
Tin Shui Wai has cleaner air right now — AQI 60 against 72.
- Tree cover gap
- 37.6 points
- Tseung Kwan O is ahead.
- Air quality gap
- 12 AQI
- Tin Shui Wai is cleaner.
- Trees between them
- 119K
- Tseung Kwan O has more standing.
Hong Kong
Hong Kong
Tree cover
Share of the 2 km radius under canopy.
37.4%
75.0%
Air quality index
US EPA index, live, with its band. Lower is better.
60 · Moderate
72 · Moderate
Trees standing
Estimated from the measured canopy area.
115K
234K
Trees still needed
To reach the same canopy target. Fewer is better.
0
0
CO₂ absorbed each year
By the trees already standing.
2.5M kg
5.2M 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. Tseung Kwan O is read from nearby ground stations and Tin Shui Wai is modelled — worth knowing, since the two are not quite like for like.
PM2.5
Fine particles, the pollutant that usually sets the index.
16.2 µg/m³
22.3 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 | Tin Shui Wai | Tseung Kwan O |
|---|---|---|
| 22 Sept | 127 | 124 |
| 23 Sept | 105 | 109 |
| 24 Sept | 94 | 95 |
| 25 Sept | 99 | 86 |
| 26 Sept | 102 | 77 |
| 27 Sept | 69 | 61 |
| 28 Sept | 52 | 47 |
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. Tseung Kwan O leads here at 75.0%.
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: Tin Shui Wai reads 60 (moderate) and Tseung Kwan O reads 72 (moderate) right now.
Frequently asked
Tin Shui Wai and Tseung Kwan O, answered
Which has more trees, Tin Shui Wai or Tseung Kwan O?
Tseung Kwan O, with roughly 234,441 trees inside its 2 km radius against 115,381. Tree cover tells a slightly different story from raw count: Tseung Kwan O has the denser canopy at 75.0%.
Which has better air quality, Tin Shui Wai or Tseung Kwan O?
Tin Shui Wai right now, at AQI 60 against 72 — a gap of 12 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?
Tin Shui Wai needs about 0 more to reach its canopy target, and Tseung Kwan O 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.
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