City report · Bac Ninh, Vietnam
Chũ Air quality today
Air quality in Chũ currently reads AQI 59 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 59
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 13.2
- tree cover
- 77.0%
- trees in this area
- 239K
- more trees needed
- 0
Measured across a 2 km radius around Lê Duẩn, tt. Chũ, Chũ, Bắc 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.
Chũ · AQI 59 (Moderate)
Chũ's tree count comes to 239,000 trees across 12.42 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Chũ today: AQI 59, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 02:00 local time via Open-Meteo / CAMS, corrected with 6 ground-station cities within 85 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 6 station cities within 85 km, e.g. Hong Bang and Hong Gai
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
13.2
PM10
22.6
NO₂
26.4
O₃
18.0
SO₂
11.9
CO
527.0
- 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 Chũ's daily AQI at 57 on average, from 39 on Nov 9 to an hourly peak of 83 on Nov 8.
Where Chũ stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Chũ: Healthy tree cover
77.0% tree cover against a 30% healthy-neighborhood target, across 12.42 km² of land.
Trees in this area
239,000
Target trees
239,000
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Chũ lost?
Since 2001, the area within 10 km of Chũ has lost about 2,910 hectares of forest (about 4,100 football pitches): 76% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 94 hectares (3.2%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from December 2017 of a 5 × 5 km area about 7 km southeast of the city center.
- Forest lost since 2001
- 2,910 haabout 4,100 football pitches
- Share of its forest
- 76%of what there was in 2000
- Cleared for good
- 94 hadeforestation: turned into farms, mines or towns
Forest loss is slowing down: about 106 hectares a year in 2021–2025, down from 222 hectares a year in 2016–2020. The worst year was 2009, when about 404 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 | 4 ha | 20 ha | 24 ha |
| 2002 | under 1 ha | under 1 ha | under 1 ha |
| 2003 | under 1 ha | 4 ha | 5 ha |
| 2004 | 2 ha | 25 ha | 28 ha |
| 2005 | under 1 ha | 14 ha | 15 ha |
| 2006 | under 1 ha | 16 ha | 16 ha |
| 2007 | 3 ha | 147 ha | 149 ha |
| 2008 | under 1 ha | 17 ha | 17 ha |
| 2009 | 23 ha | 381 ha | 404 ha |
| 2010 | 5 ha | 120 ha | 125 ha |
| 2011 | 5 ha | 98 ha | 103 ha |
| 2012 | 3 ha | 49 ha | 52 ha |
| 2013 | 5 ha | 61 ha | 66 ha |
| 2014 | 4 ha | 114 ha | 118 ha |
| 2015 | 7 ha | 142 ha | 148 ha |
| 2016 | 8 ha | 226 ha | 234 ha |
| 2017 | 11 ha | 254 ha | 265 ha |
| 2018 | 1 ha | 245 ha | 246 ha |
| 2019 | 1 ha | 206 ha | 207 ha |
| 2020 | under 1 ha | 157 ha | 157 ha |
| 2021 | 2 ha | 162 ha | 164 ha |
| 2022 | 2 ha | 121 ha | 123 ha |
| 2023 | 3 ha | 89 ha | 93 ha |
| 2024 | under 1 ha | 97 ha | 98 ha |
| 2025 | 2 ha | 51 ha | 53 ha |
What is causing deforestation around Chũ?
- Loggingcan grow back97% · 2,810 ha
- Farms, pasture and plantationscleared for good3.2% · 94 ha
Also: towns and roads, 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
- 12,200 ha
- Forest in 2020
- 11,600 ha
- Overall change
- −613 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Chũ shrank from about 12,200 hectares to 11,600 hectares, a net loss of about 613 hectares (−5%). New forest grew on about 1,590 hectares, but 2,200 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 Chũ
Same 2 km radius, same index — so they compare directly.
- Thị Trấn Đông Triều32.9 km
Vietnam
- Tree cover
- 32%
- Air quality
- 42
- Bắc Giang40.1 km
Vietnam
- Tree cover
- 27%
- Air quality
- 52
- Chí Linh42.9 km
Vietnam
- Tree cover
- 30%
- Air quality
- 53
- Hải Dương53.9 km
Vietnam
- Tree cover
- 22%
- Air quality
- 67
- Bắc Ninh54.9 km
Vietnam
- Tree cover
- 32%
- Air quality
- 99
- Lạng Sơn56.9 km
Vietnam
- Tree cover
- 32%
- Air quality
- 34
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Frequently asked
Questions about Chũ
What is the air quality (AQI) in Chũ right now?
The latest reading for Chũ shows an AQI of 59 (Moderate), observed Nov 11, 02:00 local time via Open-Meteo / CAMS, corrected with 6 ground-station cities within 85 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 Chũ today?
At AQI 59 (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 Chũ been like this week?
Over the last 7 days, the CAMS air-quality model put Chũ's daily AQI at 57 on average, from 39 on Nov 9 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 Chũ lost since 2001?
Since 2001, the area within 10 km of Chũ has lost about 2,910 hectares of forest (about 4,100 football pitches): 76% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 94 hectares (3.2%) was deforestation: forest cleared for good for farms, mines or towns. Forest loss is slowing down: about 106 hectares a year in 2021–2025, down from 222 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Chũ shrank from about 12,200 hectares to 11,600 hectares, a net loss of about 613 hectares (−5%). New forest grew on about 1,590 hectares, but 2,200 hectares were lost.
What is the tree count in Chũ?
Chũ has an estimated 239,000 trees across the 12.42 km² of land measured — 77.0% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Chũ need?
Chũ has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Chũ'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 Lê Duẩn; the tree count is an estimate derived from that cover.
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