Country comparison · 156 cities measured
Nigeria vs Spain Air quality index (AQI) and deforestation
Spain has cleaner air than Nigeria right now: its cities average AQI 21 against 101.
At ground stations alone, which measure rather than estimate, the averages are Nigeria 81 (13 cities) and Spain 24 (30 cities). Spain has lost more forest since 2001. Nigeria 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.
Nigeria101Spain21
Head to head
Nigeria vs Spain at a glance
Nigeria and Spain are level, each ahead on 3 of 6 measures. The better figure in each row is marked.
| Nigeria | Spain | |
|---|---|---|
| Average air qualityUS AQI, all measured cities. | 101 | 21 (better) |
| At ground stationsCities with a current station reading. | 81 | 24 (better) |
| Cities over AQI 100Not fine for sensitive groups. | 39% | 0% (better) |
| Forest lost since 2001The whole country. | 1.56 million ha (better) | 1.79 million ha |
| Share of its forest lostOf what it had in 2000. | 16% (better) | 17% |
| Average tree coverAcross its measured cities. | 19.4% (better) | 14.3% |
Air quality today
Is Spain cleaner than Nigeria?
On air quality, yes, right now. Spain has cleaner air than Nigeria right now: its cities average AQI 21 against 101.
At ground stations alone, which measure rather than estimate, the averages are Nigeria 81 (13 cities) and Spain 24 (30 cities).
39% of the measured cities in Nigeria are over AQI 100 today, the point where the air stops being fine for sensitive groups, against 0% in Spain.
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%)
Spain
- Good56 (98%)
- Moderate1 (2%)
Every measured city, including model estimates where no ground station is near.
Against everywhere else
How do Nigeria and Spain 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 Spain than 98%.
Cleaner air than…
- Nigeria
- Beats 6%
- Spain
- Beats 98%
More tree cover than…
- Nigeria
- Beats 39%
- Spain
- Beats 28%
Deforestation · 2001–2025
Which country has lost more forest, Nigeria or Spain?
Spain has lost more: about 1.79 million ha of forest from 2001 to 2025, against 1.56 million ha in Nigeria. 81,100 ha of Spain'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: 2025, with 153,000 ha lost.
| Nigeria | Spain | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 1.56 million ha (better) | 1.79 million ha |
| Share of its forestOf what it had in 2000. | 16% (better) | 17% |
| Cleared for goodTurned into farms, mines or towns. | 1.44 million ha | 81,100 ha (better) |
| Recent trend2021–2025 against the five years before. | Holding steady | Holding steady |
| Main known cause | Farms, pasture and plantations (87%) | Logging (65%) |
Trees
Which country has more tree cover, Nigeria or Spain?
Nigeria does: its measured cities average 19.4% tree cover against 14.3%, a gap of 5.1 percentage points.
| Nigeria | Spain | |
|---|---|---|
| Trees standingSummed across measured cities. | 5.8M (better) | 2.4M |
| Cities below their targetShort of the canopy target. | 83% (better) | 91% |
| Trees still neededTo reach those targets. | 5.3M | 2.6M (better) |
Behind the averages
The cities behind Nigeria and Spain
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 57 in Spain, 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 57, 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 Spain: your questions answered
Is Spain cleaner than Nigeria?
On air quality, yes, right now: Spain's cities average AQI 21 against 101 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 Nigeria 81 (13 cities) and Spain 24 (30 cities).
Which country has lost more forest, Nigeria or Spain?
Spain has lost more: about 1.79 million ha of forest from 2001 to 2025, against 1.56 million ha in Nigeria. 81,100 ha of Spain'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 Spain?
Nigeria does: its measured cities average 19.4% tree cover against 14.3%, a gap of 5.1 percentage points.
How many cities are the Nigeria and Spain figures based on?
99 measured cities in Nigeria and 57 in Spain. 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 Nigeria and Spain?
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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