Atsiaman vs Porto-Novo
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.
Atsiaman has more tree cover — 19.9% against 16.2%.
Atsiaman has cleaner air right now — AQI 32 against 38.
- Tree cover gap
- 3.7 points
- Atsiaman is ahead.
- Air quality gap
- 6 AQI
- Atsiaman is cleaner.
- Trees between them
- 11.6K
- Atsiaman has more standing.
Ghana
Benin
Tree cover
Share of the 2 km radius under canopy.
19.9%
16.2%
Air quality index
US EPA index, live, with its band. Lower is better.
32 · Good
38 · Good
Trees standing
Estimated from the measured canopy area.
62.5K
50.9K
Trees still needed
To reach the same canopy target. Fewer is better.
31.7K
43.4K
CO₂ absorbed each year
By the trees already standing.
1.4M kg
1.1M 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. Atsiaman is read from nearby ground stations and Porto-Novo is modelled — worth knowing, since the two are not quite like for like.
PM2.5
Fine particles, the pollutant that usually sets the index.
7.7 µg/m³
9.1 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.
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. Atsiaman leads here at 19.9%.
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: Atsiaman reads 32 (good) and Porto-Novo reads 38 (good) right now.
Frequently asked
Atsiaman and Porto-Novo, answered
Which has more trees, Atsiaman or Porto-Novo?
Atsiaman, with roughly 62,518 trees inside its 2 km radius against 50,894. Tree cover tells a slightly different story from raw count: Atsiaman has the denser canopy at 19.9%.
Which has better air quality, Atsiaman or Porto-Novo?
Atsiaman right now, at AQI 32 against 38 — a gap of 6 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?
Atsiaman needs about 31,730 more to reach its canopy target, and Porto-Novo about 43,354. 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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