Country comparison · 241 cities measured
Japan vs Tanzania Air quality index (AQI) and deforestation
Japan has cleaner air than Tanzania right now: its cities average AQI 47 against 55.
Tanzania has lost more forest since 2001. Tanzania has more tree cover in its cities.
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
Japan47Tanzania55
Head to head
Japan vs Tanzania at a glance
Japan is ahead on 4 of 5 measures, and Tanzania on 1. The better figure in each row is marked.
| Japan | Tanzania | |
|---|---|---|
| Average air qualityUS AQI, all measured cities. | 47 (better) | 55 |
| Cities over AQI 100Not fine for sensitive groups. | 0% (better) | 9% |
| Forest lost since 2001The whole country. | 1.02 million ha (better) | 3.69 million ha |
| Share of its forest lostOf what it had in 2000. | 3.9% (better) | 14% |
| Average tree coverAcross its measured cities. | 16.4% | 20.7% (better) |
Air quality today
Is Japan cleaner than Tanzania?
On air quality, yes, right now. Japan has cleaner air than Tanzania right now: its cities average AQI 47 against 55.
0% of the measured cities in Japan are over AQI 100 today, the point where the air stops being fine for sensitive groups, against 9% in Tanzania.
How each country's cities split across the air quality bands
Japan
- Good102 (49%)
- Moderate105 (51%)
Tanzania
- Good15 (44%)
- Moderate16 (47%)
- Unhealthy for sensitive groups2 (6%)
- Unhealthy1 (3%)
Every measured city, including model estimates where no ground station is near.
Against everywhere else
How do Japan and Tanzania compare with other countries?
Right now the cities of Japan average cleaner air than 58% of the 171 countries Airleaf has enough cities to average, and those of Tanzania than 46%.
Cleaner air than…
- Japan
- Beats 58%
- Tanzania
- Beats 46%
More tree cover than…
- Japan
- Beats 33%
- Tanzania
- Beats 41%
Deforestation · 2001–2025
Which country has lost more forest, Japan or Tanzania?
Tanzania has lost more: about 3.69 million ha of forest from 2001 to 2025, against 1.02 million ha in Japan, or 3.6 times as much. 3.1 million ha of Tanzania's was cleared for good, for farms, mines or towns; the rest burned, was logged or can grow back.
The whole country, from the yearly satellite maps of forest loss: unlike the city averages above, this counts every forest, not just the land around cities.
Worst year: 2016, with 54,800 ha lost.
Worst year: 2023, with 230,000 ha lost.
| Japan | Tanzania | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 1.02 million ha (better) | 3.69 million ha |
| Share of its forestOf what it had in 2000. | 3.9% (better) | 14% |
| Cleared for goodTurned into farms, mines or towns. | 108,000 ha (better) | 3.1 million ha |
| Recent trend2021–2025 against the five years before. | Holding steady | Holding steady |
| Main known cause | Logging (87%) | Farms, pasture and plantations (83%) |
Trees
Which country has more tree cover, Japan or Tanzania?
Tanzania does: its measured cities average 20.7% tree cover against 16.4%, a gap of 4.3 percentage points.
| Japan | Tanzania | |
|---|---|---|
| Trees standingSummed across measured cities. | 10.2M (better) | 2.1M |
| Cities below their targetShort of the canopy target. | 82% | 79% (better) |
| Trees still neededTo reach those targets. | 9.6M | 1.2M (better) |
Behind the averages
The cities behind Japan and Tanzania
An average says nothing about how far apart the best and worst places are. These are the measured cities at each end.
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: 207 in Japan and 34 in Tanzania, each read over the same 2 km radius, on the US EPA index. Rural land and unmeasured towns are not in it.
Coverage shapes the number
A country measured mostly in its capital reads differently from one measured across dozens of towns. Japan rests on 207 cities against 34, so its average is the steadier of the two. Forest figures come from the University of Maryland's Global Forest Change maps.
Frequently asked
Japan vs Tanzania: your questions answered
Is Japan cleaner than Tanzania?
On air quality, yes, right now: Japan's cities average AQI 47 against 55 on the US EPA index. These are live readings averaged across cities, so the gap moves with the weather.
Which country has lost more forest, Japan or Tanzania?
Tanzania has lost more: about 3.69 million ha of forest from 2001 to 2025, against 1.02 million ha in Japan, or 3.6 times as much. 3.1 million ha of Tanzania's was cleared for good, for farms, mines or towns; the rest burned, was logged or can grow back.
Which country has more tree cover, Japan or Tanzania?
Tanzania does: its measured cities average 20.7% tree cover against 16.4%, a gap of 4.3 percentage points.
How many cities are the Japan and Tanzania figures based on?
207 measured cities in Japan 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.
Does this cover the whole of Japan and Tanzania?
The air and tree figures are not: they are the cities Airleaf has measured, each over the same 2 km radius, so treat them as a comparison of urban air and urban tree cover. The forest figures are: they count every forest in the country.
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