City report · Hai Phong, Vietnam
Chí Linh Air quality today
Air quality in Chí Linh currently reads AQI 54 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 54
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 14.0
- tree cover
- 29.5%
- trees in this area
- 76.6K
- more trees needed
- 1.3K
Measured across a 2 km radius around Chi Linh, Hai Phong, Vietnam (12.57 km²), from a satellite image of Aug 20, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Chí Linh · AQI 54 (Moderate)
Chí Linh's tree count comes to 76,644 trees across 10.4 km² of land, 1 points below the 30% tree-cover level considered healthy for this area, so roughly 1,299 more trees would close the gap.
Air quality detail
Air quality in Chí Linh today: AQI 54, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 17:00 local time via Open-Meteo / CAMS, corrected with 3 ground-station cities within 45 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 3 station cities within 45 km, e.g. Duong Hao and Gia Lâm
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
14.0
PM10
23.8
NO₂
27.5
O₃
78.0
SO₂
46.0
CO
457.0
- 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 Chí Linh's daily AQI at 54 on average, from 37 on Nov 10 to an hourly peak of 83 on Nov 8.
Where Chí Linh stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Chí Linh: Below target
29.5% tree cover against a 30% healthy-neighborhood target, across 10.4 km² of land.
Trees in this area
76,644
Target trees
77,943
More trees needed
1,299
CO₂ if planted / yr
28.6 t
Deforestation · 2001–2025
How much forest has Chí Linh lost?
Since 2001, the area within 10 km of Chí Linh has lost about 55 hectares of forest (about 78 football pitches): 10% of the forest it had in 2000. The biggest cause was logging (49%), after which forest can grow back. About 15 hectares (26%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from December 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 55 haabout 78 football pitches
- Share of its forest
- 10%of what there was in 2000
- Cleared for good
- 15 hadeforestation: turned into farms, mines or towns
The worst year was 2001, when about 18 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 | 8 ha | 18 ha |
| 2002 | 1 ha | under 1 ha | 2 ha |
| 2003 | under 1 ha | under 1 ha | 1 ha |
| 2004 | 1 ha | under 1 ha | 2 ha |
| 2005 | under 1 ha | 2 ha | 2 ha |
| 2006 | under 1 ha | under 1 ha | under 1 ha |
| 2007 | under 1 ha | 1 ha | 1 ha |
| 2008 | under 1 ha | under 1 ha | under 1 ha |
| 2009 | 1 ha | 3 ha | 4 ha |
| 2010 | under 1 ha | 2 ha | 2 ha |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | under 1 ha | under 1 ha | under 1 ha |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | under 1 ha | under 1 ha | under 1 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | under 1 ha | under 1 ha | under 1 ha |
| 2017 | under 1 ha | 3 ha | 3 ha |
| 2018 | under 1 ha | under 1 ha | under 1 ha |
| 2019 | under 1 ha | under 1 ha | under 1 ha |
| 2020 | under 1 ha | under 1 ha | under 1 ha |
| 2021 | under 1 ha | under 1 ha | under 1 ha |
| 2022 | under 1 ha | under 1 ha | under 1 ha |
| 2023 | under 1 ha | under 1 ha | under 1 ha |
| 2024 | under 1 ha | 11 ha | 11 ha |
| 2025 | under 1 ha | 5 ha | 5 ha |
What is causing deforestation around Chí Linh?
- Loggingcan grow back49% · 27 ha
- Farms, pasture and plantationscleared for good22% · 12 ha
- Towns and roadscleared for good3.2% · 2 ha
Also: 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
- 2,320 ha
- Forest in 2020
- 3,200 ha
- Overall change
- +876 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Chí Linh grew from about 2,320 hectares to 3,200 hectares, a net gain of about 876 hectares (+38%). New forest grew on about 887 hectares, while 11 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 Chí Linh
Same 2 km radius, same index — so they compare directly.
- Hải Dương14.1 km
Vietnam
- Tree cover
- 22%
- Air quality
- 67
- Thị Trấn Đông Triều20.5 km
Vietnam
- Tree cover
- 32%
- Air quality
- 42
- Thuận Thanh24.8 km
Vietnam
- Tree cover
- 20%
- Air quality
- 147
- Bắc Giang26.2 km
Vietnam
- Tree cover
- 27%
- Air quality
- 52
- Bắc Ninh28.2 km
Vietnam
- Tree cover
- 32%
- Air quality
- 99
- Mỹ Hào29.4 km
Vietnam
- Tree cover
- 23%
- Air quality
- 147
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Frequently asked
Questions about Chí Linh
What is the air quality (AQI) in Chí Linh right now?
The latest reading for Chí Linh shows an AQI of 54 (Moderate), observed Nov 11, 17:00 local time via Open-Meteo / CAMS, corrected with 3 ground-station cities within 45 km, 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 Chí Linh today?
At AQI 54 (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 Chí Linh been like this week?
Over the last 7 days, the CAMS air-quality model put Chí Linh's daily AQI at 54 on average, from 37 on Nov 10 to an hourly peak of 83 on Nov 8. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Chí Linh lost since 2001?
Since 2001, the area within 10 km of Chí Linh has lost about 55 hectares of forest (about 78 football pitches): 10% of the forest it had in 2000. The biggest cause was logging (49%), after which forest can grow back. About 15 hectares (26%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Chí Linh grew from about 2,320 hectares to 3,200 hectares, a net gain of about 876 hectares (+38%). New forest grew on about 887 hectares, while 11 hectares were lost.
What is the tree count in Chí Linh?
Chí Linh has an estimated 76,644 trees across the 10.4 km² of land measured — 29.5% tree cover, 1 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Chí Linh need?
Chí Linh needs roughly 1,299 more trees to close a 1-point shortfall against its 30% tree-cover target — about 28.6 t of extra CO₂ absorbed per year once grown.
How are Chí Linh'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 Chi Linh; the tree count is an estimate derived from that cover.
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