Country comparison · 365 cities measured
Spain vs United States Air quality index (AQI) and deforestation
Spain has cleaner air than United States right now: its cities average AQI 21 against 38.
At ground stations alone, which measure rather than estimate, the averages are Spain 24 (30 cities) and United States 40 (281 cities). United States has lost more forest since 2001. United States has more tree cover in its cities.
Average of 57 cities
AQI 21
Good
Cleaner on average
- At ground stations
- AQI 24
- Tree cover
- 14.3%
- Forest lost since 2001
- 1.79 million ha
Average of 308 cities
AQI 38
Good
Cleaner on average
- At ground stations
- AQI 40
- Tree cover
- 25.1%
- Forest lost since 2001
- 126 million acres (51 million ha)
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
Spain21United States38
Head to head
Spain vs United States at a glance
Spain is ahead on 5 of 6 measures, and United States on 1. The better figure in each row is marked.
| Spain | United States | |
|---|---|---|
| Average air qualityUS AQI, all measured cities. | 21 (better) | 38 |
| At ground stationsCities with a current station reading. | 24 (better) | 40 |
| Cities over AQI 100Not fine for sensitive groups. | 0% (better) | 0% |
| Forest lost since 2001The whole country. | 1.79 million ha (better) | 126 million acres (51 million ha) |
| Share of its forest lostOf what it had in 2000. | 17% (better) | 18% |
| Average tree coverAcross its measured cities. | 14.3% | 25.1% (better) |
Air quality today
Is Spain cleaner than United States?
On air quality, yes, right now. Spain has cleaner air than United States right now: its cities average AQI 21 against 38.
At ground stations alone, which measure rather than estimate, the averages are Spain 24 (30 cities) and United States 40 (281 cities).
0% of the measured cities in Spain are over AQI 100 today, the point where the air stops being fine for sensitive groups, against 0% in the United States.
How each country's cities split across the air quality bands
Spain
- Good56 (98%)
- Moderate1 (2%)
United States
- Good200 (65%)
- Moderate107 (35%)
- Unhealthy for sensitive groups1 (0%)
Every measured city, including model estimates where no ground station is near.
Against everywhere else
How do Spain and United States compare with other countries?
Right now the cities of Spain average cleaner air than 98% of the 171 countries Airleaf has enough cities to average, and those of the United States than 73%.
Cleaner air than…
- Spain
- Beats 98%
- United States
- Beats 73%
More tree cover than…
- Spain
- Beats 28%
- United States
- Beats 52%
Deforestation · 2001–2025
Which country has lost more forest, Spain or United States?
United States has lost more: about 126 million acres (51 million ha) of forest from 2001 to 2025, against 1.79 million ha in Spain, or 28 times as much. 9.87 million acres (4 million ha) of United States'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 153,000 ha lost.
Worst year: 2004, with 6.77 million acres (2.74 million ha) lost.
| Spain | United States | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 1.79 million ha (better) | 126 million acres (51 million ha) |
| Share of its forestOf what it had in 2000. | 17% (better) | 18% |
| Cleared for goodTurned into farms, mines or towns. | 81,100 ha (better) | 9.87 million acres (4 million ha) |
| Recent trend2021–2025 against the five years before. | Holding steady | Holding steady |
| Main known cause | Logging (65%) | Logging (62%) |
Trees
Which country has more tree cover, Spain or United States?
United States does: its measured cities average 25.1% tree cover against 14.3%, a gap of 10.8 percentage points.
| Spain | United States | |
|---|---|---|
| Trees standingSummed across measured cities. | 2.4M | 23.3M (better) |
| Cities below their targetShort of the canopy target. | 91% | 64% (better) |
| Trees still neededTo reach those targets. | 2.6M (better) | 8.2M |
Behind the averages
The cities behind Spain and United States
An average says nothing about how far apart the best and worst places are. These are the measured cities at each end.
United States
- Greenest measured city
- South Fulton71.7% tree cover
- Worst air right now
- StocktonAQI 105
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: 57 in Spain and 308 in the United States, 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. United States rests on 308 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
Spain vs United States: your questions answered
Is Spain cleaner than United States?
On air quality, yes, right now: Spain's cities average AQI 21 against 38 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 Spain 24 (30 cities) and United States 40 (281 cities).
Which country has lost more forest, Spain or United States?
United States has lost more: about 126 million acres (51 million ha) of forest from 2001 to 2025, against 1.79 million ha in Spain, or 28 times as much. 9.87 million acres (4 million ha) of United States'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, Spain or United States?
United States does: its measured cities average 25.1% tree cover against 14.3%, a gap of 10.8 percentage points.
How many cities are the Spain and United States figures based on?
57 measured cities in Spain and 308 in the United States. 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 Spain and the United States?
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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