Country comparison
Colombia vs Nigeria
Averaged across every city Airleaf has measured in each country — 46 in Colombia and 57 in Nigeria — each read the same way: Sentinel-2 imagery at 10 m detail over a 2 km radius, and the live US EPA air quality index.
Nigeria averages more tree cover — 33.4% against 33.0%.
Colombia averages cleaner air — AQI 33 against 52.
- Tree cover gap
- 0.4 points
- Nigeria is ahead.
- Air quality gap
- 19 AQI
- Colombia is cleaner.
- Cities behind it
- 46 vs 57
- How much each average rests on.
Average tree cover
Mean across measured cities, each over the same 2 km radius.
33.0%
33.4%
Average air quality index
US EPA index. Lower is better.
33
52
Cities measured
How much each average rests on.
46
57
Trees still needed
Summed across measured cities, to reach their canopy targets. Fewer is better.
866K
1.1M
Reading these numbers
What a country average is, and is not
It is a mean of cities
Not a national statistic. Each figure is the average across the cities Airleaf has measured in that country — 46 in Colombia and 57 in Nigeria — each read over the same 2 km radius. Rural land, forest and everywhere unmeasured are not in it, so this compares urban areas rather than territories.
Coverage shapes the number
A country measured mostly in its capital reads differently from one measured across dozens of towns. Nigeria rests on 57 cities against 46, so its average is the steadier of the two. Both firm up as coverage grows.
Frequently asked
Colombia and Nigeria, answered
Which country has more tree cover, Colombia or Nigeria?
Nigeria, averaging 33.4% across its measured cities against 33.0% — a gap of 0.4 percentage points.
Which has cleaner air, Colombia or Nigeria?
Colombia, averaging AQI 33 against 52 on the US EPA index. These are live readings averaged across cities, so the gap moves with the weather.
How many cities is each figure based on?
46 measured cities in Colombia and 57 in Nigeria. Every one was read the same way, so the two averages are directly comparable — but a country with more measured cities has the more settled figure.
Is this the whole country?
No. It is the cities Airleaf has measured, each over a 2 km radius from its centre. Forest, farmland and unmeasured towns are not included, so treat this as a comparison of urban tree cover and urban air rather than of national land cover.
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