City report · Gyeonggi-do, South Korea
Hwaseong-si Air quality today
Air quality in Hwaseong-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
- 44.6%
- trees in this area
- 140K
- more trees needed
- 0
Measured across a 2 km radius around Namyangseongji-ro, Namyang-eup, Hwaseong-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.
Hwaseong-si · AQI 82 (Moderate)
Hwaseong-si's tree count comes to 140,115 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 Hwaseong-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 · 남양읍, 300 m away
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
26.0
PM10
34.0
NO₂
29.2
O₃
2.5
SO₂
6.0
CO
423.9
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 Hwaseong-si's daily AQI at 72 on average, from 51 on Nov 6 to an hourly peak of 134 on Nov 11.
Where Hwaseong-si stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Hwaseong-si: Healthy tree cover
44.6% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
140,115
Target trees
140,115
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Hwaseong-si lost?
Since 2001, the area within 10 km of Hwaseong-si has lost about 459 hectares of forest (about 640 football pitches): 12% of the forest it had in 2000. Most of it (81%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from June 2017 of a 5 × 5 km area about 2 km southeast of the city center.
- Forest lost since 2001
- 459 haabout 640 football pitches
- Share of its forest
- 12%of what there was in 2000
- Cleared for good
- 370 hadeforestation: turned into farms, mines or towns
The worst year was 2015, when about 40 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 | 15 ha | under 1 ha | 15 ha |
| 2002 | 17 ha | under 1 ha | 17 ha |
| 2003 | 11 ha | under 1 ha | 11 ha |
| 2004 | 9 ha | 2 ha | 11 ha |
| 2005 | 33 ha | 1 ha | 34 ha |
| 2006 | 29 ha | 3 ha | 32 ha |
| 2007 | 19 ha | 4 ha | 23 ha |
| 2008 | 19 ha | 2 ha | 21 ha |
| 2009 | 23 ha | 3 ha | 26 ha |
| 2010 | 24 ha | 3 ha | 27 ha |
| 2011 | 22 ha | 4 ha | 26 ha |
| 2012 | 13 ha | 2 ha | 15 ha |
| 2013 | 20 ha | 5 ha | 25 ha |
| 2014 | 10 ha | 3 ha | 14 ha |
| 2015 | 30 ha | 11 ha | 40 ha |
| 2016 | 12 ha | 14 ha | 25 ha |
| 2017 | 8 ha | 10 ha | 18 ha |
| 2018 | 20 ha | 4 ha | 24 ha |
| 2019 | 13 ha | 2 ha | 15 ha |
| 2020 | 11 ha | under 1 ha | 12 ha |
| 2021 | 4 ha | 11 ha | 15 ha |
| 2022 | 3 ha | 2 ha | 5 ha |
| 2023 | 3 ha | 2 ha | 5 ha |
| 2024 | 2 ha | under 1 ha | 2 ha |
| 2025 | 3 ha | under 1 ha | 4 ha |
What is causing deforestation around Hwaseong-si?
- Towns and roadscleared for good81% · 370 ha
- Loggingcan grow back19% · 86 ha
Also: mining and energy, farms, pasture and plantations, 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
- 5,960 ha
- Forest in 2020
- 5,530 ha
- Overall change
- −428 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Hwaseong-si shrank from about 5,960 hectares to 5,530 hectares, a net loss of about 428 hectares (−7.2%). New forest grew on about 169 hectares, but 597 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 Hwaseong-si
Same 2 km radius, same index — so they compare directly.
- Ansan-si13.0 km
South Korea
- Tree cover
- 30%
- Air quality
- 92
- Suwon19.4 km
South Korea
- Tree cover
- 20%
- Air quality
- 88
- Anyang-si22.8 km
South Korea
- Tree cover
- 40%
- Air quality
- 84
- Osan23.3 km
South Korea
- Tree cover
- 20%
- Air quality
- 82
- Incheon29.5 km
South Korea
- Tree cover
- 12%
- Air quality
- 88
- Bucheon-si32.6 km
South Korea
- Tree cover
- 27%
- Air quality
- 101
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Frequently asked
Questions about Hwaseong-si
What is the air quality (AQI) in Hwaseong-si right now?
The latest reading for Hwaseong-si shows an AQI of 82 (Moderate), measured Nov 12, 01:00 local time by the 남양읍 ground monitoring station, 300 m away, via OpenAQ. The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Hwaseong-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 Hwaseong-si been like this week?
Over the last 7 days, the CAMS air-quality model put Hwaseong-si's daily AQI at 72 on average, from 51 on Nov 6 to an hourly peak of 134 on Nov 11. On 1 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Hwaseong-si lost since 2001?
Since 2001, the area within 10 km of Hwaseong-si has lost about 459 hectares of forest (about 640 football pitches): 12% of the forest it had in 2000. Most of it (81%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Hwaseong-si shrank from about 5,960 hectares to 5,530 hectares, a net loss of about 428 hectares (−7.2%). New forest grew on about 169 hectares, but 597 hectares were lost.
What is the tree count in Hwaseong-si?
Hwaseong-si has an estimated 140,115 trees across the 12.57 km² measured — 44.6% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Hwaseong-si need?
Hwaseong-si has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Hwaseong-si's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Namyangseongji-ro, 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 Namyangseongji-ro; the tree count is an estimate derived from that cover.
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