Country comparison
Poland vs Tanzania
Averaged across every city Airleaf has measured in each country — 39 in Poland and 34 in Tanzania — 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.
Poland averages more tree cover — 52.9% against 18.9%.
Tanzania averages cleaner air — AQI 42 against 61.
- Tree cover gap
- 34.0 points
- Poland is ahead.
- Air quality gap
- 19 AQI
- Tanzania is cleaner.
- Cities behind it
- 39 vs 34
- How much each average rests on.
Average tree cover
Mean across measured cities, each over the same 2 km radius.
52.9%
18.9%
Average air quality index
US EPA index. Lower is better.
61
42
Cities measured
How much each average rests on.
39
34
Trees still needed
Summed across measured cities, to reach their canopy targets. Fewer is better.
1.2K
1.6M
Behind the averages
The extremes in each country
An average says nothing about how far apart the best and worst places are. These are the measured cities at each end.
Poland
- Greenest measured city
- Wałbrzych79.7% tree cover
- Worst air right now
- CzęstochowaAQI 91
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 — 39 in Poland and 34 in Tanzania — 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. Poland rests on 39 cities against 34, so its average is the steadier of the two. Both firm up as coverage grows.
Frequently asked
Poland and Tanzania, answered
Which country has more tree cover, Poland or Tanzania?
Poland, averaging 52.9% across its measured cities against 18.9% — a gap of 34.0 percentage points.
Which has cleaner air, Poland or Tanzania?
Tanzania, averaging AQI 42 against 61 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?
39 measured cities in Poland and 34 in Tanzania. 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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