City report · Hanoi, Vietnam
Hanoi Air quality today
Air quality in Hanoi currently reads AQI 154 (Unhealthy): Everyone should limit long outdoor exertion; sensitive groups more so.
AQI 154
Air quality right now
Unhealthy
- PM2.5, fine particles (µg/m³)
- 59.9
- tree cover
- 18.7%
- trees in this area
- 57.6K
- more trees needed
- 65.6K
Measured across a 2 km radius around Van Mieu - Quoc Tu Giam, Ha Noi, Vietnam (12.57 km²), from a satellite image of Aug 10, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Hanoi · AQI 154 (Unhealthy)
Hanoi's tree count comes to 57,632 trees across 12.33 km² of land, 21 points below the 40% tree-cover level considered healthy for this area, so roughly 65,645 more trees would close the gap.
Air quality detail
Air quality in Hanoi today: AQI 154, Unhealthy
Main pollutant: PM2.5 · Observed Nov 12, 00:05 local time via OpenAQ and World Air Quality Index Project ground stations, US EPA index. Values in µg/m³.
Ground station · Số 1 đường Giải Phóng - phường Bạch Mai - ĐHBK , 2.1 km away · median of 3 stations
Health signal
Everyone should limit long outdoor exertion; sensitive groups more so.
PM2.5
59.9
PM10
168.4
NO₂
83.5
O₃
26.9
SO₂
8.1
CO
—
Data: OpenAQ · Hanoi Air Quality Monitoring Network, World Air Quality Index Project, UNIS - United Nations International School Of Hanoi
- Outdoor exercise
- Everyone should cut down long or hard exercise; sensitive groups should avoid it
- Windows
- Keep them closed
- Mask
- Wear an N95 outdoors
- Air purifier
- Run one
Over the last 7 days, the CAMS air-quality model put Hanoi's daily AQI at 82 on average, from 44 on Nov 9 to an hourly peak of 157 on Nov 10.
Where Hanoi stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Hanoi: Critically low
18.7% tree cover against a 40% healthy-neighborhood target, across 12.33 km² of land.
Trees in this area
57,632
Target trees
123,277
More trees needed
65,645
CO₂ if planted / yr
1,444 t
Deforestation · 2001–2025
How much forest has Hanoi lost?
There was very little forest around Hanoi in 2000, about 86 hectares, and about 11 hectares of it has been lost since. Only fairly dense woodland counts as forest in these maps, so scattered street and garden trees don't show up here.
2017: satellite photo from December 2017 of a 5 × 5 km area in the city center.
The worst year was 2005, when about 3 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 | under 1 ha | under 1 ha |
| 2002 | under 1 ha | under 1 ha | under 1 ha |
| 2003 | 1 ha | under 1 ha | 2 ha |
| 2004 | under 1 ha | 2 ha | 2 ha |
| 2005 | under 1 ha | 2 ha | 3 ha |
| 2006 | under 1 ha | under 1 ha | under 1 ha |
| 2007 | under 1 ha | under 1 ha | 1 ha |
| 2008 | under 1 ha | under 1 ha | under 1 ha |
| 2009 | under 1 ha | under 1 ha | under 1 ha |
| 2010 | under 1 ha | under 1 ha | under 1 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 | under 1 ha | under 1 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 | under 1 ha | under 1 ha |
| 2025 | under 1 ha | under 1 ha | under 1 ha |
What is causing deforestation around Hanoi?
- Towns and roadscleared for good34% · 4 ha
- Unknown causescause unknown66% · 7 ha
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
- 1,750 ha
- Forest in 2020
- 2,360 ha
- Overall change
- +612 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Hanoi grew from about 1,750 hectares to 2,360 hectares, a net gain of about 612 hectares (+35%). New forest grew on about 628 hectares, while 16 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 Hanoi
Same 2 km radius, same index — so they compare directly.
- Thuận Thanh24.8 km
Vietnam
- Tree cover
- 20%
- Air quality
- 147
- Phúc Yên27.5 km
Vietnam
- Tree cover
- 39%
- Air quality
- 119
- Mỹ Hào27.8 km
Vietnam
- Tree cover
- 23%
- Air quality
- 147
- Bắc Ninh30.3 km
Vietnam
- Tree cover
- 32%
- Air quality
- 99
- Sơn Tây37.0 km
Vietnam
- Tree cover
- 53%
- Air quality
- 69
- Vĩnh Yên40.0 km
Vietnam
- Tree cover
- 39%
- Air quality
- 112
Also compared:Hanoi vs Ho Chi Minh CityHanoi vs HaiphongHanoi vs Cần ThơHanoi vs Huế
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Frequently asked
Questions about Hanoi
What is the air quality (AQI) in Hanoi right now?
The latest reading for Hanoi shows an AQI of 154 (Unhealthy), measured Nov 12, 00:05 local time by 3 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Số 1 đường Giải Phóng - phường Bạch Mai - ĐHBK , 2.1 km away). The main pollutant is PM2.5. Everyone should limit long outdoor exertion; sensitive groups more so.
Is it safe to exercise outside in Hanoi today?
At AQI 154 (Unhealthy): everyone should cut down long or hard exercise; sensitive groups should avoid it. Windows: keep them closed. Masks: wear an N95 outdoors. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Hanoi been like this week?
Over the last 7 days, the CAMS air-quality model put Hanoi's daily AQI at 82 on average, from 44 on Nov 9 to an hourly peak of 157 on Nov 10. On 1 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Hanoi lost since 2001?
There was very little forest around Hanoi in 2000, about 86 hectares, and about 11 hectares of it has been lost since. Only fairly dense woodland counts as forest in these maps, so scattered street and garden trees don't show up here. Comparing satellite maps from 2000 and 2020, the forest around Hanoi grew from about 1,750 hectares to 2,360 hectares, a net gain of about 612 hectares (+35%). New forest grew on about 628 hectares, while 16 hectares were lost.
What is the tree count in Hanoi?
Hanoi has an estimated 57,632 trees across the 12.33 km² of land measured — 18.7% tree cover, 21 percentage points short of the 40% tree-cover target set for this area.
How many more trees does Hanoi need?
Hanoi needs roughly 65,645 more trees to close a 21-point shortfall against its 40% tree-cover target — about 1,444 t of extra CO₂ absorbed per year once grown.
How are Hanoi's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Van Mieu - Quoc Tu Giam, 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 Van Mieu - Quoc Tu Giam; the tree count is an estimate derived from that cover.
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