City report · South Hamgyong, North Korea
Changam-ch’on Air quality today
Air quality in Changam-ch’on currently reads AQI 56 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 56
Moderate
- PM2.5, fine particles (µg/m³)
- 11.8
- tree cover
- 61.0%
- trees in this area
- 191K
- more trees needed
- 0
Measured across a 2 km radius around Hochon-gun, Hamgyong-namdo, Korea (12.57 km²), from a satellite image of Sep 23, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Changam-ch’on · AQI 56 (Moderate)
Changam-ch’on's tree count comes to 190,679 trees across 12.51 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Changam-ch’on today: AQI 56, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 08:00 local time via Open-Meteo / CAMS, US EPA index. Values in µg/m³.
Model estimate · no ground station nearby
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
11.8
PM10
21.3
NO₂
2.6
O₃
58.0
SO₂
2.0
CO
126.0
- 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 Changam-ch’on's daily AQI at 40 on average, from 23 on Nov 6 to an hourly peak of 87 on Nov 5.
Where Changam-ch’on stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Changam-ch’on: Healthy tree cover
61.0% tree cover against a 30% healthy-neighborhood target, across 12.51 km² of land.
Trees in this area
190,679
Target trees
190,679
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Changam-ch’on lost?
Since 2001, the area within 10 km of Changam-ch’on has lost about 506 hectares of forest (about 710 football pitches): 4.4% of the forest it had in 2000. Most of it was lost to wildfires, so much of it can grow back. About 61 hectares (12%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from August 2017 of a 5 × 5 km area about 7 km east of the city center.
- Forest lost since 2001
- 506 haabout 710 football pitches
- Share of its forest
- 4.4%of what there was in 2000
- Cleared for good
- 61 hadeforestation: turned into farms, mines or towns
The worst year was 2014, when about 243 hectares of forest were lost, mostly to wildfires.
Hectares of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | under 1 ha | 2 ha | 2 ha |
| 2002 | 4 ha | 12 ha | 16 ha |
| 2003 | 2 ha | 32 ha | 34 ha |
| 2004 | 3 ha | 16 ha | 19 ha |
| 2005 | under 1 ha | 7 ha | 8 ha |
| 2006 | under 1 ha | 2 ha | 2 ha |
| 2007 | under 1 ha | 9 ha | 10 ha |
| 2008 | 1 ha | 5 ha | 6 ha |
| 2009 | under 1 ha | 4 ha | 5 ha |
| 2010 | 4 ha | 8 ha | 12 ha |
| 2011 | 5 ha | 10 ha | 15 ha |
| 2012 | 5 ha | 12 ha | 16 ha |
| 2013 | 2 ha | 5 ha | 6 ha |
| 2014 | 9 ha | 234 ha | 243 ha |
| 2015 | under 1 ha | 2 ha | 3 ha |
| 2016 | 1 ha | 7 ha | 8 ha |
| 2017 | under 1 ha | under 1 ha | 1 ha |
| 2018 | under 1 ha | 1 ha | 2 ha |
| 2019 | 2 ha | 4 ha | 6 ha |
| 2020 | 1 ha | 3 ha | 4 ha |
| 2021 | 5 ha | 10 ha | 15 ha |
| 2022 | 1 ha | 12 ha | 13 ha |
| 2023 | 10 ha | 27 ha | 37 ha |
| 2024 | 1 ha | 6 ha | 7 ha |
| 2025 | 3 ha | 17 ha | 19 ha |
What is causing deforestation around Changam-ch’on?
- Wildfirescan grow back59% · 301 ha
- Loggingcan grow back25% · 126 ha
- Farms, pasture and plantationscleared for good12% · 59 ha
Also: mining and energy, towns and roads, 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
- 21,300 ha
- Forest in 2020
- 22,200 ha
- Overall change
- +970 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Changam-ch’on grew from about 21,300 hectares to 22,200 hectares, a net gain of about 970 hectares (+4.6%). New forest grew on about 1,160 hectares, while 194 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 Changam-ch’on
Same 2 km radius, same index — so they compare directly.
- Sinp’o80.3 km
North Korea
- Tree cover
- 31%
- Air quality
- 55
- Hyesan102.0 km
North Korea
- Tree cover
- 14%
- Air quality
- 96
- Hŭngnam129.4 km
North Korea
- Tree cover
- 16%
- Air quality
- 50
- Hamhŭng130.5 km
North Korea
- Tree cover
- 13%
- Air quality
- 54
- Chongjin156.2 km
North Korea
- Tree cover
- 3%
- Air quality
- 62
- Kanggye189.3 km
North Korea
- Tree cover
- 34%
- Air quality
- 111
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Frequently asked
Questions about Changam-ch’on
What is the air quality (AQI) in Changam-ch’on right now?
The latest reading for Changam-ch’on shows an AQI of 56 (Moderate), observed Nov 11, 08:00 local time via Open-Meteo / CAMS, US EPA index. The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Changam-ch’on today?
At AQI 56 (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 Changam-ch’on been like this week?
Over the last 7 days, the CAMS air-quality model put Changam-ch’on's daily AQI at 40 on average, from 23 on Nov 6 to an hourly peak of 87 on Nov 5. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Changam-ch’on lost since 2001?
Since 2001, the area within 10 km of Changam-ch’on has lost about 506 hectares of forest (about 710 football pitches): 4.4% of the forest it had in 2000. Most of it was lost to wildfires, so much of it can grow back. About 61 hectares (12%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Changam-ch’on grew from about 21,300 hectares to 22,200 hectares, a net gain of about 970 hectares (+4.6%). New forest grew on about 1,160 hectares, while 194 hectares were lost.
What is the tree count in Changam-ch’on?
Changam-ch’on has an estimated 190,679 trees across the 12.51 km² of land measured — 61.0% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Changam-ch’on need?
Changam-ch’on has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Changam-ch’on's air quality and tree cover measured?
Air quality comes from ground monitoring stations via OpenAQ where one reports nearby, and otherwise, as here, from the Open-Meteo / CAMS model, which may differ from street-level monitors. 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 Hochon-gun; the tree count is an estimate derived from that cover.
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