City report · Hanoi, Vietnam
Bắc Từ Liêm Air quality today
Air quality in Bắc Từ Liêm currently reads AQI 152 (Unhealthy): Everyone should limit long outdoor exertion; sensitive groups more so.
AQI 152
Air quality right now
Unhealthy
- PM2.5, fine particles (µg/m³)
- 56.6
- tree cover
- 37.9%
- trees in this area
- 119K
- more trees needed
- 6.6K
Measured across a 2 km radius around Phúc Lý, Minh Khai, Tây Tựu, Hà Nội, Vietnam (12.57 km²), from a satellite image of Sep 4, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Bắc Từ Liêm · AQI 152 (Unhealthy)
Bắc Từ Liêm's tree count comes to 119,066 trees across 12.57 km², 2 points below the 40% tree-cover level considered healthy for this area, so roughly 6,597 more trees would close the gap.
Air quality detail
Air quality in Bắc Từ Liêm today: AQI 152, 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 · United Nations International School of Hanoi, Vietnam (Trường Quốc tế Liên Hợp Quốc Hà Nội), 7.6 km away · median of 2 stations
Health signal
Everyone should limit long outdoor exertion; sensitive groups more so.
PM2.5
56.6
PM10
214.8
NO₂
83.5
O₃
16.1
SO₂
5.4
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 Bắc Từ Liêm's daily AQI at 78 on average, from 47 on Nov 9 to an hourly peak of 132 on Nov 8.
Where Bắc Từ Liêm stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Bắc Từ Liêm: Below target
37.9% tree cover against a 40% healthy-neighborhood target, across 12.57 km².
Trees in this area
119,066
Target trees
125,663
More trees needed
6,597
CO₂ if planted / yr
145.1 t
Deforestation · 2001–2025
How much forest has Bắc Từ Liêm lost?
There was very little forest around Bắc Từ Liêm in 2000, about 53 hectares, and about 8 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 2003, 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 | 2 ha | under 1 ha | 3 ha |
| 2004 | under 1 ha | under 1 ha | under 1 ha |
| 2005 | under 1 ha | under 1 ha | 1 ha |
| 2006 | under 1 ha | under 1 ha | under 1 ha |
| 2007 | under 1 ha | under 1 ha | under 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 Bắc Từ Liêm?
- Towns and roadscleared for good40% · 3 ha
- Farms, pasture and plantationscleared for good16% · 1 ha
- Unknown causescause unknown44% · 3 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
- 2,350 ha
- Forest in 2020
- 3,000 ha
- Overall change
- +650 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Bắc Từ Liêm grew from about 2,350 hectares to 3,000 hectares, a net gain of about 650 hectares (+28%). New forest grew on about 662 hectares, while 12 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 Bắc Từ Liêm
What is the air quality (AQI) in Bắc Từ Liêm right now?
The latest reading for Bắc Từ Liêm shows an AQI of 152 (Unhealthy), measured Nov 12, 00:05 local time by 2 ground monitoring stations via OpenAQ (the median of their readings; the nearest is United Nations International School of Hanoi, Vietnam (Trường Quốc tế Liên Hợp Quốc Hà Nội), 7.6 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 Bắc Từ Liêm today?
At AQI 152 (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 Bắc Từ Liêm been like this week?
Over the last 7 days, the CAMS air-quality model put Bắc Từ Liêm's daily AQI at 78 on average, from 47 on Nov 9 to an hourly peak of 132 on Nov 8. On 1 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Bắc Từ Liêm lost since 2001?
There was very little forest around Bắc Từ Liêm in 2000, about 53 hectares, and about 8 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 Bắc Từ Liêm grew from about 2,350 hectares to 3,000 hectares, a net gain of about 650 hectares (+28%). New forest grew on about 662 hectares, while 12 hectares were lost.
What is the tree count in Bắc Từ Liêm?
Bắc Từ Liêm has an estimated 119,066 trees across the 12.57 km² measured — 37.9% tree cover, 2 percentage points short of the 40% tree-cover target set for this area.
How many more trees does Bắc Từ Liêm need?
Bắc Từ Liêm needs roughly 6,597 more trees to close a 2-point shortfall against its 40% tree-cover target — about 145.1 t of extra CO₂ absorbed per year once grown.
How are Bắc Từ Liêm's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Phúc Lý, 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 Phúc Lý; the tree count is an estimate derived from that cover.
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