Country comparison
Germany vs United States
Averaged across every city Airleaf has measured in each country — 71 in Germany and 308 in United States — 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.
Germany averages more tree cover — 50.9% against 29.7%.
United States averages cleaner air — AQI 38 against 39.
- Tree cover gap
- 21.2 points
- Germany is ahead.
- Air quality gap
- 1 AQI
- United States is cleaner.
- Cities behind it
- 71 vs 308
- How much each average rests on.
71 cities measured
308 cities measured
Average tree cover
Mean across measured cities, each over the same 2 km radius.
50.9%
29.7%
Average air quality index
US EPA index. Lower is better.
39
38
Cities measured
How much each average rests on.
71
308
Trees standing
Summed across every measured city in each country.
11.0M
27.4M
Cities below their target
Share of measured cities short of the canopy target. Lower is better.
6% (4)
53% (164)
Trees still needed
Summed across measured cities, to reach their canopy targets. Fewer is better.
56.7K
7.5M
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.
Germany
- Greenest measured city
- Bergisch Gladbach72.5% tree cover
- Worst air right now
- MoersAQI 71
United States
- Greenest measured city
- South Fulton98.0% tree cover
- Worst air right now
- StamfordAQI 453
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 — 71 in Germany and 308 in United States — 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. United States rests on 308 cities against 71, so its average is the steadier of the two. Both firm up as coverage grows.
Frequently asked
Germany and United States, answered
Which country has more tree cover, Germany or United States?
Germany, averaging 50.9% across its measured cities against 29.7% — a gap of 21.2 percentage points.
Which has cleaner air, Germany or United States?
United States, averaging AQI 38 against 39 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?
71 measured cities in Germany and 308 in United States. 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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