City report · Hong Kong
Tin Shui Wai Air quality today
Air quality in Tin Shui Wai currently reads AQI 83 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 83
Moderate
- PM2.5, fine particles (µg/m³)
- 26.4
- tree cover
- 37.0%
- trees in this area
- 114K
- more trees needed
- 0
Measured across a 2 km radius around Kingswood Villas, New Territories, Hong Kong (12.57 km²), from a satellite image of Jun 2, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Tin Shui Wai · AQI 83 (Moderate)
Tin Shui Wai's tree count comes to 114,147 trees across 12.34 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Tin Shui Wai today: AQI 83, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 23:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Yuen Long, 2.5 km away · median of 2 stations
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
26.4
PM10
45.7
NO₂
87.3
O₃
23.8
SO₂
4.3
CO
891.1
Data: OpenAQ · Hong Kong, Environmental Protection Department, HKSAR Government · DATA.GOV.HK
- 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 Tin Shui Wai's daily AQI at 81 on average, from 62 on Nov 9 to an hourly peak of 235 on Nov 6.
This is the US EPA AQI. How it differs from Hong Kong's AQHI
Where Tin Shui Wai stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Tin Shui Wai: Healthy tree cover
37.0% tree cover against a 30% healthy-neighborhood target, across 12.34 km² of land.
Trees in this area
114,147
Target trees
114,147
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Tin Shui Wai lost?
Since 2001, the area within 10 km of Tin Shui Wai has lost about 238 hectares of forest (about 330 football pitches): 4.2% of the forest it had in 2000. The biggest cause was wildfires (45%), after which forest can grow back. About 92 hectares (39%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from January 2017 of a 5 × 5 km area about 7 km southwest of the city center.
- Forest lost since 2001
- 238 haabout 330 football pitches
- Share of its forest
- 4.2%of what there was in 2000
- Cleared for good
- 92 hadeforestation: turned into farms, mines or towns
The worst year was 2018, when about 54 hectares of forest were lost, mostly to wildfires.
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 | 2 ha |
| 2002 | under 1 ha | under 1 ha | under 1 ha |
| 2003 | under 1 ha | under 1 ha | under 1 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 | 4 ha | 5 ha |
| 2008 | 6 ha | 2 ha | 8 ha |
| 2009 | under 1 ha | 13 ha | 14 ha |
| 2010 | under 1 ha | under 1 ha | under 1 ha |
| 2011 | under 1 ha | under 1 ha | 1 ha |
| 2012 | under 1 ha | under 1 ha | 1 ha |
| 2013 | 1 ha | under 1 ha | 2 ha |
| 2014 | under 1 ha | 1 ha | 1 ha |
| 2015 | under 1 ha | under 1 ha | 1 ha |
| 2016 | 5 ha | 11 ha | 15 ha |
| 2017 | 3 ha | 2 ha | 4 ha |
| 2018 | 6 ha | 48 ha | 54 ha |
| 2019 | 3 ha | under 1 ha | 3 ha |
| 2020 | 4 ha | 16 ha | 20 ha |
| 2021 | 5 ha | 24 ha | 29 ha |
| 2022 | 5 ha | 2 ha | 7 ha |
| 2023 | 11 ha | under 1 ha | 12 ha |
| 2024 | 12 ha | 3 ha | 15 ha |
| 2025 | 27 ha | 14 ha | 41 ha |
What is causing deforestation around Tin Shui Wai?
- Wildfirescan grow back45% · 106 ha
- Towns and roadscleared for good37% · 89 ha
- Loggingcan grow back8.1% · 19 ha
Also: mining and energy, storms, floods and other natural causes, shifting farming, 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
- 8,460 ha
- Forest in 2020
- 8,640 ha
- Overall change
- +179 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Tin Shui Wai grew from about 8,460 hectares to 8,640 hectares, a net gain of about 179 hectares (+2.1%). New forest grew on about 459 hectares, while 280 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 Tin Shui Wai
Same 2 km radius, same index — so they compare directly.
- Bao'an16.2 km
China
- Tree cover
- 31%
- Air quality
- 94
- Sha Tin20.3 km
Hong Kong
- Tree cover
- 67%
- Air quality
- 60
- San Tung Chung Hang20.7 km
Hong Kong
- Tree cover
- 83%
- Air quality
- 60
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Frequently asked
Questions about Tin Shui Wai
What is the air quality (AQI) in Tin Shui Wai right now?
The latest reading for Tin Shui Wai shows an AQI of 83 (Moderate), measured Nov 11, 23:00 local time by 2 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Yuen Long, 2.5 km away). The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Tin Shui Wai today?
At AQI 83 (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 Tin Shui Wai been like this week?
Over the last 7 days, the CAMS air-quality model put Tin Shui Wai's daily AQI at 81 on average, from 62 on Nov 9 to an hourly peak of 235 on Nov 6. On 1 of those days the average was above 100, unhealthy for sensitive groups.
Is Tin Shui Wai's AQI the same as Hong Kong's AQHI?
No. Airleaf shows the US EPA Air Quality Index (AQI), the scale used by IQAir and most air-quality apps. Hong Kong's Environmental Protection Department publishes the Air Quality Health Index (AQHI) on a 1 to 10+ scale: 1–3 low, 4–6 moderate, 7 high, 8–10 very high and 10+ serious. It is a health-risk scale built from short-term pollutant levels, not a converted AQI, so the two numbers can't be compared directly.
How much forest has the area around Tin Shui Wai lost since 2001?
Since 2001, the area within 10 km of Tin Shui Wai has lost about 238 hectares of forest (about 330 football pitches): 4.2% of the forest it had in 2000. The biggest cause was wildfires (45%), after which forest can grow back. About 92 hectares (39%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Tin Shui Wai grew from about 8,460 hectares to 8,640 hectares, a net gain of about 179 hectares (+2.1%). New forest grew on about 459 hectares, while 280 hectares were lost.
What is the tree count in Tin Shui Wai?
Tin Shui Wai has an estimated 114,147 trees across the 12.34 km² of land measured — 37.0% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Tin Shui Wai need?
Tin Shui Wai has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Tin Shui Wai's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Kingswood Villas, 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 Kingswood Villas; the tree count is an estimate derived from that cover.
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