Bắc Giang vs Gia Lâm
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.
Gia Lâm has more tree cover — 55.3% against 28.1%.
Gia Lâm has cleaner air right now — AQI 77 against 126.
- Tree cover gap
- 27.2 points
- Gia Lâm is ahead.
- Air quality gap
- 49 AQI
- Gia Lâm is cleaner.
- Trees between them
- 85.0K
- Gia Lâm has more standing.
Tree cover
Share of the 2 km radius under canopy.
28.1%
55.3%
Air quality index
US EPA index, live, with its band. Lower is better.
126 · Unhealthy for sensitive groups
77 · Moderate
Trees standing
Estimated from the measured canopy area.
87.3K
172K
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
3.8M 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. Gia Lâm 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
24.7 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 | Bắc Giang | Gia Lâm |
|---|---|---|
| 22 Sept | 201 | 182 |
| 23 Sept | 169 | 153 |
| 24 Sept | 154 | 137 |
| 25 Sept | 154 | 138 |
| 26 Sept | 120 | 112 |
| 27 Sept | 106 | 110 |
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. Gia Lâm leads here at 55.3%.
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 Gia Lâm reads 77 (moderate) right now.
Frequently asked
Bắc Giang and Gia Lâm, answered
Which has more trees, Bắc Giang or Gia Lâm?
Gia Lâm, with roughly 172,340 trees inside its 2 km radius against 87,308. Tree cover tells a slightly different story from raw count: Gia Lâm has the denser canopy at 55.3%.
Which has better air quality, Bắc Giang or Gia Lâm?
Gia Lâm right now, at AQI 77 against 126 — a gap of 49 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 Gia Lâm 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
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- Bắc Giang vs Phổ Yên47% tree cover · AQI 100Compare
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- Bắc Giang vs Bắc Từ Liêm43% tree cover · AQI 82Compare
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