Country comparison · 145 cities measured
Thailand vs Vietnam Air quality index (AQI) and deforestation
Vietnam has cleaner air than Thailand right now: its cities average AQI 58 against 61.
At ground stations alone, which measure rather than estimate, the averages are Thailand 64 (29 cities) and Vietnam 92 (20 cities), which puts Thailand ahead instead. Vietnam has lost more forest since 2001. Vietnam 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.
Thailand61Vietnam58
Head to head
Thailand vs Vietnam at a glance
Thailand is ahead on 4 of 6 measures, and Vietnam on 2. The better figure in each row is marked.
| Thailand | Vietnam | |
|---|---|---|
| Average air qualityUS AQI, all measured cities. | 61 | 58 (better) |
| At ground stationsCities with a current station reading. | 64 (better) | 92 |
| Cities over AQI 100Not fine for sensitive groups. | 0% (better) | 11% |
| Forest lost since 2001The whole country. | 2.84 million ha (better) | 3.85 million ha |
| Share of its forest lostOf what it had in 2000. | 14% (better) | 23% |
| Average tree coverAcross its measured cities. | 32.7% | 35.8% (better) |
Air quality today
Is Vietnam cleaner than Thailand?
On air quality, yes, right now. Vietnam has cleaner air than Thailand right now: its cities average AQI 58 against 61.
At ground stations alone, which measure rather than estimate, the averages are Thailand 64 (29 cities) and Vietnam 92 (20 cities), which puts Thailand ahead instead.
0% of the measured cities in Thailand are over AQI 100 today, the point where the air stops being fine for sensitive groups, against 11% in Vietnam.
How each country's cities split across the air quality bands
Thailand
- Good5 (16%)
- Moderate26 (84%)
Vietnam
- Good41 (36%)
- Moderate61 (54%)
- Unhealthy for sensitive groups6 (5%)
- Unhealthy6 (5%)
Every measured city, including model estimates where no ground station is near.
Against everywhere else
How do Thailand and Vietnam compare with other countries?
Right now the cities of Thailand average cleaner air than 34% of the 171 countries Airleaf has enough cities to average, and those of Vietnam than 39%.
Cleaner air than…
- Thailand
- Beats 34%
- Vietnam
- Beats 39%
More tree cover than…
- Thailand
- Beats 73%
- Vietnam
- Beats 79%
Deforestation · 2001–2025
Which country has lost more forest, Thailand or Vietnam?
Vietnam has lost more: about 3.85 million ha of forest from 2001 to 2025, against 2.84 million ha in Thailand, or 1.4 times as much. 1.41 million ha of Vietnam'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 199,000 ha lost.
Worst year: 2016, with 357,000 ha lost.
| Thailand | Vietnam | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 2.84 million ha (better) | 3.85 million ha |
| Share of its forestOf what it had in 2000. | 14% (better) | 23% |
| Cleared for goodTurned into farms, mines or towns. | 2.49 million ha | 1.41 million ha (better) |
| Recent trend2021–2025 against the five years before. | Holding steady | Slowing down |
| Main known cause | Farms, pasture and plantations (86%) | Logging (47%) |
Trees
Which country has more tree cover, Thailand or Vietnam?
Vietnam does: its measured cities average 35.8% tree cover against 32.7%, a gap of 3.0 percentage points.
| Thailand | Vietnam | |
|---|---|---|
| Trees standingSummed across measured cities. | 3.0M | 12.0M (better) |
| Cities below their targetShort of the canopy target. | 42% (better) | 46% |
| Trees still neededTo reach those targets. | 286K (better) | 1.5M |
Behind the averages
The cities behind Thailand and Vietnam
An average says nothing about how far apart the best and worst places are. These are the measured cities at each end.
Thailand
- Greenest measured city
- Kabin Buri64.4% tree cover
- Worst air right now
- Chon BuriAQI 85
Vietnam
- Greenest measured city
- Thị Trấn Thuận Châu82.6% tree cover
- Worst air right now
- Phúc YênAQI 165
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: 31 in Thailand and 114 in Vietnam, 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. Vietnam rests on 114 cities against 31, so its average is the steadier of the two. Forest figures come from the University of Maryland's Global Forest Change maps.
Frequently asked
Thailand vs Vietnam: your questions answered
Is Vietnam cleaner than Thailand?
On air quality, yes, right now: Vietnam's cities average AQI 58 against 61 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 Thailand 64 (29 cities) and Vietnam 92 (20 cities), which puts Thailand ahead instead.
Which country has lost more forest, Thailand or Vietnam?
Vietnam has lost more: about 3.85 million ha of forest from 2001 to 2025, against 2.84 million ha in Thailand, or 1.4 times as much. 1.41 million ha of Vietnam'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, Thailand or Vietnam?
Vietnam does: its measured cities average 35.8% tree cover against 32.7%, a gap of 3.0 percentage points.
How many cities are the Thailand and Vietnam figures based on?
31 measured cities in Thailand and 114 in Vietnam. 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 Thailand and Vietnam?
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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