City report · Hanoi, Vietnam
Sơn Tây Air quality today
Air quality in Sơn Tây currently reads AQI 73 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 73
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 25.7
- tree cover
- 52.7%
- trees in this area
- 156K
- more trees needed
- 0
Measured across a 2 km radius around Son Tay, Ha Noi, Vietnam (12.57 km²), from a satellite image of Sep 4, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Sơn Tây · AQI 73 (Moderate)
Sơn Tây's tree count comes to 155,628 trees across 11.82 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Sơn Tây today: AQI 73, Moderate
Main pollutant: PM2.5 · Observed Nov 10, 20:00 local time via Open-Meteo / CAMS, corrected with 7 ground-station cities within 165 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 7 station cities within 165 km, e.g. Vinh Phuc and Tây Tựu
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
25.7
PM10
43.8
NO₂
50.3
O₃
13.0
SO₂
38.0
CO
659.0
- 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 Sơn Tây's daily AQI at 76 on average, from 47 on Nov 9 to an hourly peak of 157 on Nov 4.
Where Sơn Tây stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Sơn Tây: Healthy tree cover
52.7% tree cover against a 30% healthy-neighborhood target, across 11.82 km² of land.
Trees in this area
155,628
Target trees
155,628
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Sơn Tây lost?
Since 2001, the area within 10 km of Sơn Tây has lost about 32 hectares of forest (about 45 football pitches): 21% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 8 hectares (25%) 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
- 32 haabout 45 football pitches
- Share of its forest
- 21%of what there was in 2000
- Cleared for good
- 8 hadeforestation: turned into farms, mines or towns
The worst year was 2023, when about 7 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 | under 1 ha | under 1 ha |
| 2005 | under 1 ha | under 1 ha | under 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 | 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 | 3 ha | 4 ha |
| 2016 | 2 ha | 2 ha | 3 ha |
| 2017 | under 1 ha | 2 ha | 2 ha |
| 2018 | 1 ha | under 1 ha | 1 ha |
| 2019 | under 1 ha | 3 ha | 3 ha |
| 2020 | under 1 ha | 1 ha | 2 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 | 7 ha | 7 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 Sơn Tây?
- Loggingcan grow back72% · 23 ha
- Farms, pasture and plantationscleared for good23% · 7 ha
- Towns and roadscleared for good1.9% · under 1 ha
Also: 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
- 5,560 ha
- Forest in 2020
- 6,330 ha
- Overall change
- +774 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Sơn Tây grew from about 5,560 hectares to 6,330 hectares, a net gain of about 774 hectares (+14%). New forest grew on about 871 hectares, while 97 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 Sơn Tây
What is the air quality (AQI) in Sơn Tây right now?
The latest reading for Sơn Tây shows an AQI of 73 (Moderate), observed Nov 10, 20:00 local time via Open-Meteo / CAMS, corrected with 7 ground-station cities within 165 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 Sơn Tây today?
At AQI 73 (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 Sơn Tây been like this week?
Over the last 7 days, the CAMS air-quality model put Sơn Tây's daily AQI at 76 on average, from 47 on Nov 9 to an hourly peak of 157 on Nov 4. On 1 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Sơn Tây lost since 2001?
Since 2001, the area within 10 km of Sơn Tây has lost about 32 hectares of forest (about 45 football pitches): 21% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 8 hectares (25%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Sơn Tây grew from about 5,560 hectares to 6,330 hectares, a net gain of about 774 hectares (+14%). New forest grew on about 871 hectares, while 97 hectares were lost.
What is the tree count in Sơn Tây?
Sơn Tây has an estimated 155,628 trees across the 11.82 km² of land measured — 52.7% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Sơn Tây need?
Sơn Tây has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Sơn Tây'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 Son Tay; the tree count is an estimate derived from that cover.
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