Country comparison · 90 cities measured
South Korea vs Tanzania Air quality index (AQI) and deforestation
Tanzania has cleaner air than South Korea right now: its cities average AQI 55 against 80.
Tanzania has lost more forest since 2001. South Korea has more tree cover in its cities.
Average of 56 cities
AQI 80
Moderate
Cleaner on average
- At ground stations
- AQI 80
- Tree cover
- 28.4%
- Forest lost since 2001
- 436,000 ha
Average of 34 cities
AQI 55
Moderate
Cleaner on average
- Tree cover
- 20.7%
- Forest lost since 2001
- 3.69 million ha
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
South Korea80Tanzania55
Head to head
South Korea vs Tanzania at a glance
South Korea is ahead on 3 of 5 measures, and Tanzania on 2. The better figure in each row is marked.
| South Korea | Tanzania | |
|---|---|---|
| Average air qualityUS AQI, all measured cities. | 80 | 55 (better) |
| Cities over AQI 100Not fine for sensitive groups. | 9% | 9% (better) |
| Forest lost since 2001The whole country. | 436,000 ha (better) | 3.69 million ha |
| Share of its forest lostOf what it had in 2000. | 8.2% (better) | 14% |
| Average tree coverAcross its measured cities. | 28.4% (better) | 20.7% |
Air quality today
Is Tanzania cleaner than South Korea?
On air quality, yes, right now. Tanzania has cleaner air than South Korea right now: its cities average AQI 55 against 80.
9% of the measured cities in South Korea 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
South Korea
- Good1 (2%)
- Moderate50 (89%)
- Unhealthy for sensitive groups5 (9%)
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 South Korea and Tanzania compare with other countries?
Right now the cities of South Korea average cleaner air than 14% of the 171 countries Airleaf has enough cities to average, and those of Tanzania than 46%.
Cleaner air than…
- South Korea
- Beats 14%
- Tanzania
- Beats 46%
More tree cover than…
- South Korea
- Beats 64%
- Tanzania
- Beats 41%
Deforestation · 2001–2025
Which country has lost more forest, South Korea or Tanzania?
Tanzania has lost more: about 3.69 million ha of forest from 2001 to 2025, against 436,000 ha in South Korea, or 8.5 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: 2025, with 87,000 ha lost.
Worst year: 2023, with 230,000 ha lost.
| South Korea | Tanzania | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 436,000 ha (better) | 3.69 million ha |
| Share of its forestOf what it had in 2000. | 8.2% (better) | 14% |
| Cleared for goodTurned into farms, mines or towns. | 67,300 ha (better) | 3.1 million ha |
| Recent trend2021–2025 against the five years before. | Speeding up | Holding steady |
| Main known cause | Logging (70%) | Farms, pasture and plantations (83%) |
Trees
Which country has more tree cover, South Korea or Tanzania?
South Korea does: its measured cities average 28.4% tree cover against 20.7%, a gap of 7.7 percentage points.
| South Korea | Tanzania | |
|---|---|---|
| Trees standingSummed across measured cities. | 4.8M (better) | 2.1M |
| Cities below their targetShort of the canopy target. | 57% (better) | 79% |
| Trees still neededTo reach those targets. | 1.3M | 1.2M (better) |
Behind the averages
The cities behind South Korea 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: 56 in South Korea 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. South Korea rests on 56 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
South Korea vs Tanzania: your questions answered
Is Tanzania cleaner than South Korea?
On air quality, yes, right now: Tanzania's cities average AQI 55 against 80 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, South Korea or Tanzania?
Tanzania has lost more: about 3.69 million ha of forest from 2001 to 2025, against 436,000 ha in South Korea, or 8.5 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, South Korea or Tanzania?
South Korea does: its measured cities average 28.4% tree cover against 20.7%, a gap of 7.7 percentage points.
How many cities are the South Korea and Tanzania figures based on?
56 measured cities in South Korea 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 South Korea 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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