City report · Quảng Ninh, Vietnam
Hạ Long Air quality today
Air quality in Hạ Long 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)
- 10.5
- tree cover
- 37.1%
- trees in this area
- 46.2K
- more trees needed
- 0
Measured across a 2 km radius around Hong Gai, Quang Ninh, Vietnam (12.57 km²), from a satellite image of Sep 21, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Hạ Long · AQI 54 (Moderate)
Hạ Long's tree count comes to 46,155 trees across 4.98 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Hạ Long today: AQI 54, Moderate
Main pollutant: PM10 · Observed Nov 11, 22:00 local time via World Air Quality Index Project ground stations, US EPA index. Values in µg/m³.
Ground station · Quảng Ninh/Trung tâm văn hóa thể thao Cẩm Phả, Vietnam, 21.8 km away · median of 2 stations
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
10.5
PM10
61.8
NO₂
—
O₃
—
SO₂
—
CO
—
Data: World Air Quality Index Project, Vietnam Center For Environmental Monitoring Portal (cổng thông tin quan trắc môi trường)
- 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 Hạ Long's daily AQI at 38 on average, from 30 on Nov 4 to an hourly peak of 64 on Nov 9.
Where Hạ Long stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Hạ Long: Healthy tree cover
37.1% tree cover against a 30% healthy-neighborhood target, across 4.98 km² of land.
Trees in this area
46,155
Target trees
46,155
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Hạ Long lost?
Since 2001, the area within 10 km of Hạ Long has lost about 764 hectares of forest (about 1,100 football pitches): 30% of the forest it had in 2000. Most of it (65%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from October 2017 of a 5 × 5 km area about 7 km west of the city center.
- Forest lost since 2001
- 764 haabout 1,100 football pitches
- Share of its forest
- 30%of what there was in 2000
- Cleared for good
- 500 hadeforestation: turned into farms, mines or towns
Forest loss is speeding up: about 64 hectares a year in 2021–2025, up from 38 hectares a year in 2016–2020. The worst year was 2024, when about 183 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 | 9 ha | 7 ha | 15 ha |
| 2002 | 11 ha | under 1 ha | 11 ha |
| 2003 | 14 ha | 4 ha | 17 ha |
| 2004 | 17 ha | 3 ha | 20 ha |
| 2005 | 32 ha | 4 ha | 36 ha |
| 2006 | 6 ha | 2 ha | 8 ha |
| 2007 | 32 ha | 1 ha | 33 ha |
| 2008 | 13 ha | under 1 ha | 13 ha |
| 2009 | 25 ha | 2 ha | 27 ha |
| 2010 | 8 ha | 13 ha | 20 ha |
| 2011 | 6 ha | 2 ha | 8 ha |
| 2012 | 4 ha | 4 ha | 9 ha |
| 2013 | 2 ha | 4 ha | 7 ha |
| 2014 | 5 ha | 11 ha | 16 ha |
| 2015 | 9 ha | 4 ha | 13 ha |
| 2016 | 64 ha | 13 ha | 78 ha |
| 2017 | 30 ha | 11 ha | 41 ha |
| 2018 | 19 ha | 9 ha | 28 ha |
| 2019 | 6 ha | 8 ha | 14 ha |
| 2020 | 15 ha | 16 ha | 30 ha |
| 2021 | 13 ha | 14 ha | 28 ha |
| 2022 | 5 ha | 9 ha | 14 ha |
| 2023 | 5 ha | 5 ha | 11 ha |
| 2024 | 99 ha | 84 ha | 183 ha |
| 2025 | 52 ha | 33 ha | 85 ha |
What is causing deforestation around Hạ Long?
- Towns and roadscleared for good40% · 302 ha
- Loggingcan grow back29% · 219 ha
- Mining and energycleared for good20% · 155 ha
Also: farms, pasture and plantations, wildfires, 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
- 4,380 ha
- Forest in 2020
- 3,920 ha
- Overall change
- −456 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Hạ Long shrank from about 4,380 hectares to 3,920 hectares, a net loss of about 456 hectares (−10%). New forest grew on about 283 hectares, but 739 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
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Frequently asked
Questions about Hạ Long
What is the air quality (AQI) in Hạ Long right now?
The latest reading for Hạ Long shows an AQI of 54 (Moderate), measured Nov 11, 22:00 local time by 2 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Quảng Ninh/Trung tâm văn hóa thể thao Cẩm Phả, Vietnam, 21.8 km away). The main pollutant is PM10. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Hạ Long 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 Hạ Long been like this week?
Over the last 7 days, the CAMS air-quality model put Hạ Long's daily AQI at 38 on average, from 30 on Nov 4 to an hourly peak of 64 on Nov 9. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Hạ Long lost since 2001?
Since 2001, the area within 10 km of Hạ Long has lost about 764 hectares of forest (about 1,100 football pitches): 30% of the forest it had in 2000. Most of it (65%) was deforestation, forest cleared for good, mainly for towns and roads. Forest loss is speeding up: about 64 hectares a year in 2021–2025, up from 38 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Hạ Long shrank from about 4,380 hectares to 3,920 hectares, a net loss of about 456 hectares (−10%). New forest grew on about 283 hectares, but 739 hectares were lost.
What is the tree count in Hạ Long?
Hạ Long has an estimated 46,155 trees across the 4.98 km² of land measured — 37.1% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Hạ Long need?
Hạ Long has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Hạ Long's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Hong Gai, 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 Hong Gai; the tree count is an estimate derived from that cover.
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