Accra vs Ashaiman
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.
Accra has more tree cover — 7.9% against 6.3%.
Accra has cleaner air right now — AQI 64 against 79.
- Tree cover gap
- 1.6 points
- Accra is ahead.
- Air quality gap
- 15 AQI
- Accra is cleaner.
- Trees between them
- 2.7K
- Accra has more standing.
Tree cover
Share of the 2 km radius under canopy.
7.9%
6.3%
Air quality index
US EPA index, live, with its band. Lower is better.
64 · Moderate
79 · Moderate
Trees standing
Estimated from the measured canopy area.
22.5K
19.8K
Trees still needed
To reach the same canopy target. Fewer is better.
63.0K
74.5K
CO₂ absorbed each year
By the trees already standing.
496K kg
435K 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. Both are read from nearby ground stations.
PM2.5
Fine particles, the pollutant that usually sets the index.
18.3 µg/m³
25.6 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 | Accra | Ashaiman |
|---|---|---|
| 22 Sept | 31 | 31 |
| 23 Sept | 28 | 28 |
| 24 Sept | 41 | 41 |
| 25 Sept | 38 | 38 |
| 26 Sept | 37 | 37 |
| 27 Sept | 33 | 33 |
| 28 Sept | 31 | 30 |
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. Accra leads here at 7.9%.
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: Accra reads 64 (moderate) and Ashaiman reads 79 (moderate) right now.
Frequently asked
Accra and Ashaiman, answered
Which has more trees, Accra or Ashaiman?
Accra, with roughly 22,535 trees inside its 2 km radius against 19,792. Tree cover tells a slightly different story from raw count: Accra has the denser canopy at 7.9%.
Which has better air quality, Accra or Ashaiman?
Accra right now, at AQI 64 against 79 — a gap of 15 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?
Accra needs about 63,042 more to reach its canopy target, and Ashaiman about 74,456. 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 Accra with somewhere else
This place
Accra
Want a different pair? Browse comparisons or measure any address.