Country comparison · 738 cities measured
China vs Nigeria Air quality index (AQI) and deforestation
Nigeria has cleaner air than China right now: its cities average AQI 101 against 114.
At ground stations alone, which measure rather than estimate, the averages are China 125 (433 cities) and Nigeria 81 (13 cities). China has lost more forest since 2001. China has more tree cover in its cities.
Average of 639 cities
AQI 114
Unhealthy for sensitive groups
Cleaner on average
- At ground stations
- AQI 125
- Tree cover
- 22.9%
- Forest lost since 2001
- 13.5 million ha
Average of 99 cities
AQI 101
Unhealthy for sensitive groups
Cleaner on average
- At ground stations
- AQI 81
- Tree cover
- 19.4%
- Forest lost since 2001
- 1.56 million ha
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
China114Nigeria101
Head to head
China vs Nigeria at a glance
Nigeria is ahead on 4 of 6 measures, and China on 2. The better figure in each row is marked.
| China | Nigeria | |
|---|---|---|
| Average air qualityUS AQI, all measured cities. | 114 | 101 (better) |
| At ground stationsCities with a current station reading. | 125 | 81 (better) |
| Cities over AQI 100Not fine for sensitive groups. | 55% | 39% (better) |
| Forest lost since 2001The whole country. | 13.5 million ha | 1.56 million ha (better) |
| Share of its forest lostOf what it had in 2000. | 8.3% (better) | 16% |
| Average tree coverAcross its measured cities. | 22.9% (better) | 19.4% |
Air quality today
Is Nigeria cleaner than China?
On air quality, yes, right now. Nigeria has cleaner air than China right now: its cities average AQI 101 against 114.
At ground stations alone, which measure rather than estimate, the averages are China 125 (433 cities) and Nigeria 81 (13 cities).
55% of the measured cities in China are over AQI 100 today, the point where the air stops being fine for sensitive groups, against 39% in Nigeria.
How each country's cities split across the air quality bands
China
- Good47 (7%)
- Moderate241 (38%)
- Unhealthy for sensitive groups141 (22%)
- Unhealthy190 (30%)
- Very unhealthy20 (3%)
Nigeria
- Good2 (2%)
- Moderate58 (59%)
- Unhealthy for sensitive groups29 (29%)
- Unhealthy9 (9%)
- Very unhealthy1 (1%)
Every measured city, including model estimates where no ground station is near.
Against everywhere else
How do China and Nigeria compare with other countries?
Right now the cities of China average cleaner air than 4% of the 171 countries Airleaf has enough cities to average, and those of Nigeria than 6%.
Cleaner air than…
- China
- Beats 4%
- Nigeria
- Beats 6%
More tree cover than…
- China
- Beats 46%
- Nigeria
- Beats 39%
Deforestation · 2001–2025
Which country has lost more forest, China or Nigeria?
China has lost more: about 13.5 million ha of forest from 2001 to 2025, against 1.56 million ha in Nigeria, or 8.6 times as much. 2.24 million ha of China'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: 2008, with 739,000 ha lost.
Worst year: 2017, with 172,000 ha lost.
| China | Nigeria | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 13.5 million ha | 1.56 million ha (better) |
| Share of its forestOf what it had in 2000. | 8.3% (better) | 16% |
| Cleared for goodTurned into farms, mines or towns. | 2.24 million ha | 1.44 million ha (better) |
| Recent trend2021–2025 against the five years before. | Holding steady | Holding steady |
| Main known cause | Logging (75%) | Farms, pasture and plantations (87%) |
Trees
Which country has more tree cover, China or Nigeria?
China does: its measured cities average 22.9% tree cover against 19.4%, a gap of 3.5 percentage points.
| China | Nigeria | |
|---|---|---|
| Trees standingSummed across measured cities. | 43.8M (better) | 5.8M |
| Cities below their targetShort of the canopy target. | 81% (better) | 83% |
| Trees still neededTo reach those targets. | 27.4M | 5.3M (better) |
Behind the averages
The cities behind China and Nigeria
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: 639 in China and 99 in Nigeria, 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. China rests on 639 cities against 99, so its average is the steadier of the two. Forest figures come from the University of Maryland's Global Forest Change maps.
Frequently asked
China vs Nigeria: your questions answered
Is Nigeria cleaner than China?
On air quality, yes, right now: Nigeria's cities average AQI 101 against 114 on the US EPA index. These are live readings averaged across cities, so the gap moves with the weather. At ground stations alone, which measure rather than estimate, the averages are China 125 (433 cities) and Nigeria 81 (13 cities).
Which country has lost more forest, China or Nigeria?
China has lost more: about 13.5 million ha of forest from 2001 to 2025, against 1.56 million ha in Nigeria, or 8.6 times as much. 2.24 million ha of China'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, China or Nigeria?
China does: its measured cities average 22.9% tree cover against 19.4%, a gap of 3.5 percentage points.
How many cities are the China and Nigeria figures based on?
639 measured cities in China and 99 in Nigeria. 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.
Why are there two air quality averages for each country?
The first covers every measured city, using a ground station where one is close and a model estimate everywhere else. The second counts only cities with a current station reading, which is measured rather than estimated but covers fewer places. Airleaf's world rankings use the station figures only.
Does this cover the whole of China and Nigeria?
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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