City report · Vietnam
Lạng Sơn Air quality today
Air quality in Lạng Sơn currently reads AQI 36 (Good): Air quality is satisfactory for everyone.
AQI 36
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 6.6
- tree cover
- 31.9%
- trees in this area
- 98.6K
- more trees needed
- 0
Measured across a 2 km radius around Dong Kinh, Lang Son, Vietnam (12.57 km²), from a satellite image of Sep 21, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Lạng Sơn · AQI 36 (Good)
Lạng Sơn's tree count comes to 98,613 trees across 12.37 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Lạng Sơn today: AQI 36, Good
Main pollutant: PM2.5 · Observed Nov 11, 06:00 local time via Open-Meteo / CAMS, corrected with 4 ground-station cities within 125 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 4 station cities within 125 km, e.g. Chongzuo and Hong Gai
Health signal
Air quality is satisfactory for everyone.
PM2.5
6.6
PM10
10.5
NO₂
13.1
O₃
34.0
SO₂
2.4
CO
239.0
- 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 Lạng Sơn's daily AQI at 45 on average, from 26 on Nov 10 to an hourly peak of 72 on Nov 6.
Where Lạng Sơn stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Lạng Sơn: Healthy tree cover
31.9% tree cover against a 30% healthy-neighborhood target, across 12.37 km² of land.
Trees in this area
98,613
Target trees
98,613
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Lạng Sơn lost?
Since 2001, the area within 10 km of Lạng Sơn has lost about 2,950 hectares of forest (about 4,100 football pitches): 20% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 147 hectares (5%) was deforestation: forest cleared for good for farms, mines or towns.
2018: satellite photo from October 2018 of a 5 × 5 km area about 6 km southwest of the city center.
- Forest lost since 2001
- 2,950 haabout 4,100 football pitches
- Share of its forest
- 20%of what there was in 2000
- Cleared for good
- 147 hadeforestation: turned into farms, mines or towns
Forest loss is speeding up: about 391 hectares a year in 2021–2025, up from 148 hectares a year in 2016–2020. The worst year was 2022, when about 496 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 | 9 ha | 9 ha |
| 2002 | under 1 ha | 2 ha | 3 ha |
| 2003 | under 1 ha | 9 ha | 9 ha |
| 2004 | 1 ha | 13 ha | 14 ha |
| 2005 | 2 ha | 24 ha | 26 ha |
| 2006 | under 1 ha | 11 ha | 11 ha |
| 2007 | 2 ha | 18 ha | 20 ha |
| 2008 | 2 ha | 11 ha | 12 ha |
| 2009 | 4 ha | 37 ha | 41 ha |
| 2010 | under 1 ha | 12 ha | 13 ha |
| 2011 | 3 ha | 12 ha | 15 ha |
| 2012 | 3 ha | 9 ha | 11 ha |
| 2013 | 1 ha | 7 ha | 8 ha |
| 2014 | 1 ha | 26 ha | 27 ha |
| 2015 | 2 ha | 31 ha | 33 ha |
| 2016 | 13 ha | 52 ha | 65 ha |
| 2017 | 11 ha | 124 ha | 135 ha |
| 2018 | 9 ha | 104 ha | 113 ha |
| 2019 | 5 ha | 189 ha | 193 ha |
| 2020 | 8 ha | 228 ha | 236 ha |
| 2021 | 25 ha | 429 ha | 454 ha |
| 2022 | 11 ha | 485 ha | 496 ha |
| 2023 | 8 ha | 347 ha | 355 ha |
| 2024 | 11 ha | 247 ha | 258 ha |
| 2025 | 25 ha | 369 ha | 394 ha |
What is causing deforestation around Lạng Sơn?
- Loggingcan grow back85% · 2,500 ha
- Shifting farmingcan grow back10% · 303 ha
- Farms, pasture and plantationscleared for good2.5% · 73 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
- 24,200 ha
- Forest in 2020
- 24,100 ha
- Overall change
- −63 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Lạng Sơn stayed about the same size, at about 24,100 hectares: new forest grew on about 335 hectares, and about 398 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 Lạng Sơn
Same 2 km radius, same index — so they compare directly.
- Pingxiang, Guangxi27.2 km
China
- Tree cover
- 63%
- Air quality
- 25
- Chũ56.9 km
Vietnam
- Tree cover
- 77%
- Air quality
- 57
- Chongzuo85.9 km
China
- Tree cover
- 46%
- Air quality
- 64
- Bắc Giang87.1 km
Vietnam
- Tree cover
- 27%
- Air quality
- 52
- Thị Trấn Đông Triều89.4 km
Vietnam
- Tree cover
- 32%
- Air quality
- 42
- Thái Nguyên98.6 km
Vietnam
- Tree cover
- 36%
- Air quality
- 52
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Frequently asked
Questions about Lạng Sơn
What is the air quality (AQI) in Lạng Sơn right now?
The latest reading for Lạng Sơn shows an AQI of 36 (Good), observed Nov 11, 06:00 local time via Open-Meteo / CAMS, corrected with 4 ground-station cities within 125 km, US EPA index. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Lạng Sơn today?
At AQI 36 (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 Lạng Sơn been like this week?
Over the last 7 days, the CAMS air-quality model put Lạng Sơn's daily AQI at 45 on average, from 26 on Nov 10 to an hourly peak of 72 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 Lạng Sơn lost since 2001?
Since 2001, the area within 10 km of Lạng Sơn has lost about 2,950 hectares of forest (about 4,100 football pitches): 20% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 147 hectares (5%) was deforestation: forest cleared for good for farms, mines or towns. Forest loss is speeding up: about 391 hectares a year in 2021–2025, up from 148 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Lạng Sơn stayed about the same size, at about 24,100 hectares: new forest grew on about 335 hectares, and about 398 hectares were lost.
What is the tree count in Lạng Sơn?
Lạng Sơn has an estimated 98,613 trees across the 12.37 km² of land measured — 31.9% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Lạng Sơn need?
Lạng Sơn has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Lạng Sơn'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 Dong Kinh; the tree count is an estimate derived from that cover.
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