City report · Gyeonggi-do, South Korea
Seongnam-si Air quality today
Air quality in Seongnam-si currently reads AQI 82 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 82
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 26.0
- tree cover
- 31.7%
- trees in this area
- 99.6K
- more trees needed
- 0
Measured across a 2 km radius around Talli-ro 25beon-gil, Sujeong-gu, Seongnam-si, Gyeonggi-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.
Seongnam-si · AQI 82 (Moderate)
Seongnam-si's tree count comes to 99,588 trees across 12.57 km², already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Seongnam-si today: AQI 82, Moderate
Main pollutant: PM2.5 · Observed Nov 12, 01:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · 성남대로(모란역), 900 m away · median of 10 stations
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
26.0
PM10
37.0
NO₂
56.5
O₃
8.6
SO₂
4.5
CO
641.5
Data: OpenAQ · Korea Air Ministry of Environment, Korea Environment Corporation · AirKorea
- Outdoor exercise
- Fine for most people; unusually sensitive people should take long or hard exercise easier
- Windows
- Fine to open; close them if you are sensitive to pollution
- Mask
- Not needed for most people
- Air purifier
- Worth running if you are sensitive
Over the last 7 days, the CAMS air-quality model put Seongnam-si's daily AQI at 80 on average, from 56 on Nov 6 to an hourly peak of 169 on Nov 4.
Where Seongnam-si stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Seongnam-si: Healthy tree cover
31.7% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
99,588
Target trees
99,588
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Seongnam-si lost?
Since 2001, the area within 10 km of Seongnam-si has lost about 448 hectares of forest (about 630 football pitches): 3.4% 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 June 2017 of a 5 × 5 km area about 7 km southeast of the city center.
- Forest lost since 2001
- 448 haabout 630 football pitches
- Share of its forest
- 3.4%of what there was in 2000
- Cleared for good
- 400 hadeforestation: turned into farms, mines or towns
The worst year was 2006, when about 45 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 | 10 ha | under 1 ha | 10 ha |
| 2002 | 2 ha | under 1 ha | 3 ha |
| 2003 | 19 ha | 1 ha | 20 ha |
| 2004 | 13 ha | 2 ha | 15 ha |
| 2005 | 44 ha | 1 ha | 45 ha |
| 2006 | 45 ha | under 1 ha | 45 ha |
| 2007 | 30 ha | under 1 ha | 30 ha |
| 2008 | 19 ha | under 1 ha | 20 ha |
| 2009 | 8 ha | 2 ha | 9 ha |
| 2010 | 7 ha | 1 ha | 8 ha |
| 2011 | 15 ha | under 1 ha | 15 ha |
| 2012 | 27 ha | under 1 ha | 28 ha |
| 2013 | 2 ha | under 1 ha | 3 ha |
| 2014 | 5 ha | under 1 ha | 5 ha |
| 2015 | 28 ha | under 1 ha | 28 ha |
| 2016 | 26 ha | under 1 ha | 26 ha |
| 2017 | 19 ha | under 1 ha | 20 ha |
| 2018 | 20 ha | 3 ha | 23 ha |
| 2019 | 15 ha | 4 ha | 19 ha |
| 2020 | 7 ha | 2 ha | 10 ha |
| 2021 | 7 ha | 11 ha | 18 ha |
| 2022 | 8 ha | 6 ha | 13 ha |
| 2023 | 9 ha | under 1 ha | 10 ha |
| 2024 | 7 ha | under 1 ha | 7 ha |
| 2025 | 10 ha | 9 ha | 19 ha |
What is causing deforestation around Seongnam-si?
- Towns and roadscleared for good89% · 399 ha
- Loggingcan grow back7.7% · 34 ha
- Unknown causescause unknown2.9% · 13 ha
Also: mining and energy.
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
- 15,400 ha
- Forest in 2020
- 15,200 ha
- Overall change
- −226 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Seongnam-si stayed about the same size, at about 15,200 hectares: new forest grew on about 289 hectares, and about 515 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 Seongnam-si
Same 2 km radius, same index — so they compare directly.
- Hanam12.8 km
South Korea
- Tree cover
- 30%
- Air quality
- 88
- Guri-si17.8 km
South Korea
- Tree cover
- 31%
- Air quality
- 84
- Anyang-si19.3 km
South Korea
- Tree cover
- 40%
- Air quality
- 84
- Seoul20.0 km
South Korea
- Tree cover
- 20%
- Air quality
- 90
- Suwon20.0 km
South Korea
- Tree cover
- 20%
- Air quality
- 88
- Hwado28.1 km
South Korea
- Tree cover
- 53%
- Air quality
- 84
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Frequently asked
Questions about Seongnam-si
What is the air quality (AQI) in Seongnam-si right now?
The latest reading for Seongnam-si shows an AQI of 82 (Moderate), measured Nov 12, 01:00 local time by 10 ground monitoring stations via OpenAQ (the median of their readings; the nearest is 성남대로(모란역), 900 m away). The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Seongnam-si today?
At AQI 82 (Moderate): fine for most people; unusually sensitive people should take long or hard exercise easier. Windows: fine to open; close them if you are sensitive to pollution. Masks: not needed for most people. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Seongnam-si been like this week?
Over the last 7 days, the CAMS air-quality model put Seongnam-si's daily AQI at 80 on average, from 56 on Nov 6 to an hourly peak of 169 on Nov 4. On 1 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Seongnam-si lost since 2001?
Since 2001, the area within 10 km of Seongnam-si has lost about 448 hectares of forest (about 630 football pitches): 3.4% 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 Seongnam-si stayed about the same size, at about 15,200 hectares: new forest grew on about 289 hectares, and about 515 hectares were lost.
What is the tree count in Seongnam-si?
Seongnam-si has an estimated 99,588 trees across the 12.57 km² measured — 31.7% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Seongnam-si need?
Seongnam-si has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Seongnam-si's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Talli-ro 25beon-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 Talli-ro 25beon-gil; the tree count is an estimate derived from that cover.
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