City report · Jeju-do, South Korea
Jeju City Air quality today
Air quality in Jeju City currently reads AQI 39 (Good): Air quality is satisfactory for everyone.
AQI 39
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 7.0
- tree cover
- 8.1%
- trees in this area
- 19.7K
- more trees needed
- 53.3K
Measured across a 2 km radius around Namseong-ro 23-gil, Jeju-si, Jeju-do, South Korea (12.57 km²), from a satellite image of Sep 23, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Jeju City · AQI 39 (Good)
Jeju City's tree count comes to 19,721 trees across 9.74 km² of land, 22 points below the 30% tree-cover level considered healthy for this area, so roughly 53,321 more trees would close the gap.
Air quality detail
Air quality in Jeju City today: AQI 39, Good
Main pollutant: PM2.5 · Observed Nov 12, 02:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · 이도동, 1.4 km away · median of 5 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
7.0
PM10
14.0
NO₂
11.1
O₃
73.7
SO₂
3.7
CO
286.4
Data: OpenAQ · Korea Air Ministry of Environment, Korea Environment Corporation · AirKorea
- Outdoor exercise
- A good day to be active outside
- Windows
- Open them to air the house
- Mask
- Not needed
- Air purifier
- Not needed
Over the last 7 days, the CAMS air-quality model put Jeju City's daily AQI at 40 on average, from 20 on Nov 7 to an hourly peak of 120 on Nov 6.
Where Jeju City stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Jeju City: Critically low
8.1% tree cover against a 30% healthy-neighborhood target, across 9.74 km² of land.
Trees in this area
19,721
Target trees
73,042
More trees needed
53,321
CO₂ if planted / yr
1,173 t
Deforestation · 2001–2025
How much forest has Jeju City lost?
Since 2001, the area within 10 km of Jeju City has lost about 302 hectares of forest (about 420 football pitches): 4.3% of the forest it had in 2000. Most of it (89%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from July 2017 of a 5 × 5 km area about 7 km southeast of the city center.
- Forest lost since 2001
- 302 haabout 420 football pitches
- Share of its forest
- 4.3%of what there was in 2000
- Cleared for good
- 270 hadeforestation: turned into farms, mines or towns
The worst year was 2012, when about 78 hectares of forest were lost.
Hectares of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | under 1 ha | under 1 ha | under 1 ha |
| 2002 | under 1 ha | under 1 ha | under 1 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | 16 ha | under 1 ha | 17 ha |
| 2005 | 1 ha | under 1 ha | 1 ha |
| 2006 | 27 ha | 4 ha | 31 ha |
| 2007 | under 1 ha | under 1 ha | under 1 ha |
| 2008 | 43 ha | 4 ha | 47 ha |
| 2009 | under 1 ha | under 1 ha | under 1 ha |
| 2010 | under 1 ha | under 1 ha | under 1 ha |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | 71 ha | 7 ha | 78 ha |
| 2013 | 5 ha | under 1 ha | 5 ha |
| 2014 | 31 ha | 1 ha | 33 ha |
| 2015 | 6 ha | 10 ha | 16 ha |
| 2016 | 11 ha | under 1 ha | 12 ha |
| 2017 | 8 ha | under 1 ha | 9 ha |
| 2018 | under 1 ha | under 1 ha | under 1 ha |
| 2019 | 2 ha | under 1 ha | 2 ha |
| 2020 | under 1 ha | under 1 ha | under 1 ha |
| 2021 | 3 ha | under 1 ha | 3 ha |
| 2022 | 2 ha | under 1 ha | 3 ha |
| 2023 | 8 ha | under 1 ha | 8 ha |
| 2024 | 7 ha | under 1 ha | 8 ha |
| 2025 | 28 ha | 2 ha | 29 ha |
What is causing deforestation around Jeju City?
- Towns and roadscleared for good62% · 186 ha
- Farms, pasture and plantationscleared for good27% · 81 ha
- Loggingcan grow back8.4% · 25 ha
Also: mining and energy, unknown causes.
Causes for 2025 are estimates, based on what caused forest loss in the same places up to 2024.
Forest gained and lost, 2000–2020
- Forest in 2000
- 8,580 ha
- Forest in 2020
- 8,100 ha
- Overall change
- −487 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Jeju City shrank from about 8,580 hectares to 8,100 hectares, a net loss of about 487 hectares (−5.7%). New forest grew on about 188 hectares, but 675 hectares were lost.
These 2000 and 2020 maps, from the University of Maryland, count any land with trees taller than 5 m as forest, including plantations and orchards. Forest that was cut or burned and had grown back by 2020 counts in both years, so the loss here is smaller than the yearly figures.
These figures cover everything within 10 km of the city center, a wider area than the report above, because forest is usually lost at a city's edges.
Source: Hansen/UMD/Google/USGS/NASA, Global Forest Change (GFC-2025-v1.13); causes: WRI/Google DeepMind drivers of forest loss; both CC BY 4.0, summed by Airleaf for each area. Forest gained and lost 2000–2020: Potapov et al. 2022, UMD GLAD Global Land Cover and Land Use Change, CC BY 4.0. Images: contains modified Copernicus Sentinel data. How it's measured
In the same region
Measured cities near Jeju City
Same 2 km radius, same index — so they compare directly.
- Seogwipo28.8 km
South Korea
- Tree cover
- 43%
- Air quality
- 50
- Mokpo145.4 km
South Korea
- Tree cover
- 26%
- Air quality
- 107
- Yeosu174.2 km
South Korea
- Tree cover
- 48%
- Air quality
- 68
- Masan182.1 km
South Korea
- Tree cover
- 20%
- Air quality
- 68
- Suncheon183.2 km
South Korea
- Tree cover
- 46%
- Air quality
- 68
- Gwangju186.5 km
South Korea
- Tree cover
- 7%
- Air quality
- 66
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Frequently asked
Questions about Jeju City
What is the air quality (AQI) in Jeju City right now?
The latest reading for Jeju City shows an AQI of 39 (Good), measured Nov 12, 02:00 local time by 5 ground monitoring stations via OpenAQ (the median of their readings; the nearest is 이도동, 1.4 km away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Jeju City today?
At AQI 39 (Good): a good day to be active outside. Windows: open them to air the house. Masks: not needed. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Jeju City been like this week?
Over the last 7 days, the CAMS air-quality model put Jeju City's daily AQI at 40 on average, from 20 on Nov 7 to an hourly peak of 120 on Nov 6. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Jeju City lost since 2001?
Since 2001, the area within 10 km of Jeju City has lost about 302 hectares of forest (about 420 football pitches): 4.3% of the forest it had in 2000. Most of it (89%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Jeju City shrank from about 8,580 hectares to 8,100 hectares, a net loss of about 487 hectares (−5.7%). New forest grew on about 188 hectares, but 675 hectares were lost.
What is the tree count in Jeju City?
Jeju City has an estimated 19,721 trees across the 9.74 km² of land measured — 8.1% tree cover, 22 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Jeju City need?
Jeju City needs roughly 53,321 more trees to close a 22-point shortfall against its 30% tree-cover target — about 1,173 t of extra CO₂ absorbed per year once grown.
How are Jeju City's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Namseong-ro 23-gil, via OpenAQ; the 7-day trend is the Open-Meteo / CAMS model's estimate. Tree cover is measured from Sentinel-2 L2A (ESA Copernicus) via Earth Search satellite imagery at 10 m detail across a 2 km radius around Namseong-ro 23-gil; the tree count is an estimate derived from that cover.
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