Hong Kong vs Tin Shui Wai
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.
Hong Kong has more tree cover — 50.6% against 37.4%.
Hong Kong has cleaner air right now — AQI 28 against 55.
- Tree cover gap
- 13.2 points
- Hong Kong is ahead.
- Air quality gap
- 27 AQI
- Hong Kong is cleaner.
- Trees between them
- 7.1K
- Tin Shui Wai has more standing.
Hong Kong
Hong Kong
Tree cover
Share of the 2 km radius under canopy.
50.6%
37.4%
Air quality index
US EPA index, live, with its band. Lower is better.
28 · Good
55 · Moderate
Trees standing
Estimated from the measured canopy area.
108K
115K
Trees still needed
To reach the same canopy target. Fewer is better.
0
0
CO₂ absorbed each year
By the trees already standing.
2.4M kg
2.5M 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. Hong Kong 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.
6.6 µg/m³
14.1 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 | Hong Kong | Tin Shui Wai |
|---|---|---|
| 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 | 50 | 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. Hong Kong leads here at 50.6%.
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: Hong Kong reads 28 (good) and Tin Shui Wai reads 55 (moderate) right now.
Frequently asked
Hong Kong and Tin Shui Wai, answered
Which has more trees, Hong Kong or Tin Shui Wai?
Tin Shui Wai, with roughly 115,381 trees inside its 2 km radius against 108,255. Tree cover tells a slightly different story from raw count: Hong Kong has the denser canopy at 50.6%.
Which has better air quality, Hong Kong or Tin Shui Wai?
Hong Kong right now, at AQI 28 against 55 — a gap of 27 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?
Hong Kong needs about 0 more to reach its canopy target, and Tin Shui Wai 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
Other comparisons nearby
Build your own
Compare Hong Kong with somewhere else
This place
Hong Kong
Want a different pair? Browse comparisons or measure any address.