Beiliu vs Lạng Sơn
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.
Lạng Sơn has more tree cover — 38.8% against 31.5%.
Beiliu has cleaner air right now — AQI 49 against 112.
- Tree cover gap
- 7.3 points
- Lạng Sơn is ahead.
- Air quality gap
- 63 AQI
- Beiliu is cleaner.
- Trees between them
- 25.1K
- Lạng Sơn has more standing.
Tree cover
Share of the 2 km radius under canopy.
31.5%
38.8%
Air quality index
US EPA index, live, with its band. Lower is better.
49 · Good
112 · Unhealthy for sensitive groups
Trees standing
Estimated from the measured canopy area.
94.8K
120K
Trees still needed
To reach the same canopy target. Fewer is better.
0
0
CO₂ absorbed each year
By the trees already standing.
2.1M 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. Lạng Sơn is read from nearby ground stations and Beiliu is modelled — worth knowing, since the two are not quite like for like.
PM2.5
Fine particles, the pollutant that usually sets the index.
9 µg/m³
18.2 µg/m³
PM10
Coarser particles — dust, pollen, road grit.
11.3 µg/m³
18.6 µg/m³
Nitrogen dioxide
Mostly traffic and combustion.
1 µg/m³
10.3 µg/m³
Ozone
Forms in sunlight; peaks on hot, still afternoons.
105 µg/m³
129 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 | Beiliu | Lạng Sơn |
|---|---|---|
| 22 Sept | 103 | 127 |
| 23 Sept | 82 | 89 |
| 24 Sept | 90 | 72 |
| 25 Sept | 87 | 68 |
| 26 Sept | 61 | 64 |
| 27 Sept | 56 | 59 |
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. Lạng Sơn leads here at 38.8%.
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: Beiliu reads 49 (good) and Lạng Sơn reads 112 (unhealthy for sensitive groups) right now.
Frequently asked
Beiliu and Lạng Sơn, answered
Which has more trees, Beiliu or Lạng Sơn?
Lạng Sơn, with roughly 119,943 trees inside its 2 km radius against 94,804. Tree cover tells a slightly different story from raw count: Lạng Sơn has the denser canopy at 38.8%.
Which has better air quality, Beiliu or Lạng Sơn?
Beiliu right now, at AQI 49 against 112 — a gap of 63 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?
Beiliu needs about 0 more to reach its canopy target, and Lạng Sơn 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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