Country comparison · 133 cities measured
Nigeria vs Tanzania Air quality index (AQI) and deforestation
Tanzania has cleaner air than Nigeria right now: its cities average AQI 55 against 101.
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.
Nigeria101Tanzania55
Head to head
Nigeria vs Tanzania at a glance
Tanzania is ahead on 4 of 5 measures, and Nigeria on 1. The better figure in each row is marked.
| Nigeria | Tanzania | |
|---|---|---|
| Average air qualityUS AQI, all measured cities. | 101 | 55 (better) |
| Cities over AQI 100Not fine for sensitive groups. | 39% | 9% (better) |
| Forest lost since 2001The whole country. | 1.56 million ha (better) | 3.69 million ha |
| Share of its forest lostOf what it had in 2000. | 16% | 14% (better) |
| Average tree coverAcross its measured cities. | 19.4% | 20.7% (better) |
Air quality today
Is Tanzania cleaner than Nigeria?
On air quality, yes, right now. Tanzania has cleaner air than Nigeria right now: its cities average AQI 55 against 101.
39% of the measured cities in Nigeria 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
Nigeria
- Good2 (2%)
- Moderate58 (59%)
- Unhealthy for sensitive groups29 (29%)
- Unhealthy9 (9%)
- Very unhealthy1 (1%)
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 Nigeria and Tanzania compare with other countries?
Right now the cities of Nigeria average cleaner air than 6% of the 171 countries Airleaf has enough cities to average, and those of Tanzania than 46%.
Cleaner air than…
- Nigeria
- Beats 6%
- Tanzania
- Beats 46%
More tree cover than…
- Nigeria
- Beats 39%
- Tanzania
- Beats 41%
Deforestation · 2001–2025
Which country has lost more forest, Nigeria or Tanzania?
Tanzania has lost more: about 3.69 million ha of forest from 2001 to 2025, against 1.56 million ha in Nigeria, or 2.4 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: 2017, with 172,000 ha lost.
Worst year: 2023, with 230,000 ha lost.
| Nigeria | Tanzania | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 1.56 million ha (better) | 3.69 million ha |
| Share of its forestOf what it had in 2000. | 16% | 14% (better) |
| Cleared for goodTurned into farms, mines or towns. | 1.44 million ha (better) | 3.1 million ha |
| Recent trend2021–2025 against the five years before. | Holding steady | Holding steady |
| Main known cause | Farms, pasture and plantations (87%) | Farms, pasture and plantations (83%) |
Trees
Which country has more tree cover, Nigeria or Tanzania?
Tanzania does: its measured cities average 20.7% tree cover against 19.4%, a gap of 1.3 percentage points.
| Nigeria | Tanzania | |
|---|---|---|
| Trees standingSummed across measured cities. | 5.8M (better) | 2.1M |
| Cities below their targetShort of the canopy target. | 83% | 79% (better) |
| Trees still neededTo reach those targets. | 5.3M | 1.2M (better) |
Behind the averages
The cities behind Nigeria and Tanzania
An average says nothing about how far apart the best and worst places are. These are the measured cities at each end.
Nigeria
- Greenest measured city
- Efon-Alaaye76.1% tree cover
- Worst air right now
- NsukkaAQI 151
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: 99 in Nigeria 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. Nigeria rests on 99 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
Nigeria vs Tanzania: your questions answered
Is Tanzania cleaner than Nigeria?
On air quality, yes, right now: Tanzania's cities average AQI 55 against 101 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, Nigeria or Tanzania?
Tanzania has lost more: about 3.69 million ha of forest from 2001 to 2025, against 1.56 million ha in Nigeria, or 2.4 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, Nigeria or Tanzania?
Tanzania does: its measured cities average 20.7% tree cover against 19.4%, a gap of 1.3 percentage points.
How many cities are the Nigeria and Tanzania figures based on?
99 measured cities in Nigeria 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 Nigeria 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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