Bắc Giang vs Phúc Yên
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.
Phúc Yên has more tree cover — 53.5% against 28.1%.
Phúc Yên has cleaner air right now — AQI 82 against 126.
- Tree cover gap
- 25.4 points
- Phúc Yên is ahead.
- Air quality gap
- 44 AQI
- Phúc Yên is cleaner.
- Trees between them
- 80.1K
- Phúc Yên has more standing.
Tree cover
Share of the 2 km radius under canopy.
28.1%
53.5%
Air quality index
US EPA index, live, with its band. Lower is better.
126 · Unhealthy for sensitive groups
82 · Moderate
Trees standing
Estimated from the measured canopy area.
87.3K
167K
Trees still needed
To reach the same canopy target. Fewer is better.
21.4K
0
CO₂ absorbed each year
By the trees already standing.
1.9M kg
3.7M 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. Phúc Yên is read from nearby ground stations and Bắc Giang is modelled — worth knowing, since the two are not quite like for like.
PM2.5
Fine particles, the pollutant that usually sets the index.
29.6 µg/m³
26.9 µg/m³
PM10
Coarser particles — dust, pollen, road grit.
30.7 µg/m³
29.1 µg/m³
Nitrogen dioxide
Mostly traffic and combustion.
10.2 µg/m³
20.1 µg/m³
Ozone
Forms in sunlight; peaks on hot, still afternoons.
155 µg/m³
110 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 | Bắc Giang | Phúc Yên |
|---|---|---|
| 22 Sept | 201 | 192 |
| 23 Sept | 169 | 154 |
| 24 Sept | 154 | 127 |
| 25 Sept | 154 | 139 |
| 26 Sept | 120 | 107 |
| 27 Sept | 106 | 108 |
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. Phúc Yên leads here at 53.5%.
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: Bắc Giang reads 126 (unhealthy for sensitive groups) and Phúc Yên reads 82 (moderate) right now.
Frequently asked
Bắc Giang and Phúc Yên, answered
Which has more trees, Bắc Giang or Phúc Yên?
Phúc Yên, with roughly 167,403 trees inside its 2 km radius against 87,308. Tree cover tells a slightly different story from raw count: Phúc Yên has the denser canopy at 53.5%.
Which has better air quality, Bắc Giang or Phúc Yên?
Phúc Yên right now, at AQI 82 against 126 — a gap of 44 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?
Bắc Giang needs about 21,439 more to reach its canopy target, and Phúc Yên 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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