City report · South Korea
Cheonan Air quality today
Air quality in Cheonan currently reads AQI 117 (Unhealthy for sensitive groups): Sensitive groups should limit long or intense outdoor activity.
AQI 117
Air quality right now
Unhealthy for sensitive groups
- PM2.5, fine particles (µg/m³)
- 42.0
- tree cover
- 13.3%
- trees in this area
- 41.8K
- more trees needed
- 68.2K
Measured across a 2 km radius around Oryong-dong, Dongnam-gu, Cheonan-si, Chungcheongnam-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.
Cheonan · AQI 117 (Unhealthy for sensitive groups)
Cheonan's tree count comes to 41,783 trees across 12.57 km², 22 points below the 35% tree-cover level considered healthy for this area, so roughly 68,173 more trees would close the gap.
Air quality detail
Air quality in Cheonan today: AQI 117, Unhealthy for sensitive groups
Main pollutant: PM2.5 · Observed Nov 12, 01:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · 신방동, 3.9 km away · median of 7 stations
Health signal
Sensitive groups should limit long or intense outdoor activity.
PM2.5
42.0
PM10
68.5
NO₂
26.3
O₃
7.2
SO₂
9.2
CO
675.9
Data: OpenAQ · Korea Air Ministry of Environment, Korea Environment Corporation · AirKorea
- Outdoor exercise
- Children, older adults and people with asthma or heart disease should cut down long or hard exercise
- Windows
- Close them to keep the outside air out
- Mask
- Sensitive groups: an N95 outdoors
- Air purifier
- Run one, especially in bedrooms
Over the last 7 days, the CAMS air-quality model put Cheonan's daily AQI at 67 on average, from 50 on Nov 6 to an hourly peak of 86 on Nov 10.
Where Cheonan stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Cheonan: Critically low
13.3% tree cover against a 35% healthy-neighborhood target, across 12.57 km².
Trees in this area
41,783
Target trees
109,956
More trees needed
68,173
CO₂ if planted / yr
1,500 t
Deforestation · 2001–2025
How much forest has Cheonan lost?
Since 2001, the area within 10 km of Cheonan has lost about 1,030 hectares of forest (about 1,400 football pitches): 12% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 493 hectares (48%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from July 2017 of a 5 × 5 km area about 7 km east of the city center.
- Forest lost since 2001
- 1,030 haabout 1,400 football pitches
- Share of its forest
- 12%of what there was in 2000
- Cleared for good
- 493 hadeforestation: turned into farms, mines or towns
Forest loss has stayed about the same: about 54 hectares a year in 2021–2025, against 67 hectares a year in 2016–2020. The worst year was 2019, when about 77 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 | 12 ha | 7 ha | 19 ha |
| 2002 | 6 ha | 1 ha | 7 ha |
| 2003 | 8 ha | 4 ha | 12 ha |
| 2004 | 18 ha | 4 ha | 23 ha |
| 2005 | 13 ha | 7 ha | 20 ha |
| 2006 | 18 ha | 7 ha | 25 ha |
| 2007 | 11 ha | 6 ha | 18 ha |
| 2008 | 32 ha | 17 ha | 49 ha |
| 2009 | 34 ha | 8 ha | 43 ha |
| 2010 | 32 ha | 14 ha | 46 ha |
| 2011 | 21 ha | 7 ha | 28 ha |
| 2012 | 12 ha | 4 ha | 16 ha |
| 2013 | 10 ha | 9 ha | 19 ha |
| 2014 | 13 ha | 20 ha | 33 ha |
| 2015 | 21 ha | 51 ha | 73 ha |
| 2016 | 23 ha | 52 ha | 75 ha |
| 2017 | 31 ha | 40 ha | 71 ha |
| 2018 | 20 ha | 40 ha | 60 ha |
| 2019 | 17 ha | 61 ha | 77 ha |
| 2020 | 21 ha | 29 ha | 50 ha |
| 2021 | 21 ha | 23 ha | 44 ha |
| 2022 | 18 ha | 49 ha | 66 ha |
| 2023 | 18 ha | 37 ha | 55 ha |
| 2024 | 16 ha | 18 ha | 35 ha |
| 2025 | 46 ha | 26 ha | 72 ha |
What is causing deforestation around Cheonan?
- Loggingcan grow back52% · 533 ha
- Towns and roadscleared for good47% · 483 ha
Also: farms, pasture and plantations, 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
- 10,100 ha
- Forest in 2020
- 9,600 ha
- Overall change
- −549 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Cheonan shrank from about 10,100 hectares to 9,600 hectares, a net loss of about 549 hectares (−5.4%). New forest grew on about 232 hectares, but 780 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 Cheonan
Same 2 km radius, same index — so they compare directly.
- Pyeongtaek21.7 km
South Korea
- Tree cover
- 10%
- Air quality
- 126
- Sejong26.9 km
South Korea
- Tree cover
- 17%
- Air quality
- 99
- Cheongju-si35.5 km
South Korea
- Tree cover
- 23%
- Air quality
- 99
- Osan39.1 km
South Korea
- Tree cover
- 20%
- Air quality
- 82
- Hwaseong-si53.6 km
South Korea
- Tree cover
- 45%
- Air quality
- 82
- Daejeon54.9 km
South Korea
- Tree cover
- 14%
- Air quality
- 79
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Frequently asked
Questions about Cheonan
What is the air quality (AQI) in Cheonan right now?
The latest reading for Cheonan shows an AQI of 117 (Unhealthy for sensitive groups), measured Nov 12, 01:00 local time by 7 ground monitoring stations via OpenAQ (the median of their readings; the nearest is 신방동, 3.9 km away). The main pollutant is PM2.5. Sensitive groups should limit long or intense outdoor activity.
Is it safe to exercise outside in Cheonan today?
At AQI 117 (Unhealthy for sensitive groups): children, older adults and people with asthma or heart disease should cut down long or hard exercise. Windows: close them to keep the outside air out. Masks: sensitive groups: an N95 outdoors. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Cheonan been like this week?
Over the last 7 days, the CAMS air-quality model put Cheonan's daily AQI at 67 on average, from 50 on Nov 6 to an hourly peak of 86 on Nov 10. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Cheonan lost since 2001?
Since 2001, the area within 10 km of Cheonan has lost about 1,030 hectares of forest (about 1,400 football pitches): 12% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 493 hectares (48%) was deforestation: forest cleared for good for farms, mines or towns. Forest loss has stayed about the same: about 54 hectares a year in 2021–2025, against 67 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Cheonan shrank from about 10,100 hectares to 9,600 hectares, a net loss of about 549 hectares (−5.4%). New forest grew on about 232 hectares, but 780 hectares were lost.
What is the tree count in Cheonan?
Cheonan has an estimated 41,783 trees across the 12.57 km² measured — 13.3% tree cover, 22 percentage points short of the 35% tree-cover target set for this area.
How many more trees does Cheonan need?
Cheonan needs roughly 68,173 more trees to close a 22-point shortfall against its 35% tree-cover target — about 1,500 t of extra CO₂ absorbed per year once grown.
How are Cheonan's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Oryong-dong, 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 Oryong-dong; the tree count is an estimate derived from that cover.
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