City report · Zhejiang, China
Hangzhou Air quality today
Air quality in Hangzhou currently reads AQI 157 (Unhealthy): Everyone should limit long outdoor exertion; sensitive groups more so.
Air quality right now
AQI 157
Unhealthy
- PM2.5, fine particles (µg/m³)
- 64.2
- tree cover
- 28.3%
- trees in this area
- 88.0K
- more trees needed
- 36.4K
Measured across a 2 km radius around Gongshu District, Hangzhou, Zhejiang, China (12.57 km²), from a satellite image of Jul 31, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Hangzhou · AQI 157 (Unhealthy)
Hangzhou's tree count comes to 88,018 trees across 12.44 km² of land, 12 points below the 40% tree-cover level considered healthy for this area, so roughly 36,389 more trees would close the gap.
Air quality detail
Air quality in Hangzhou today: AQI 157, Unhealthy
Main pollutant: PM2.5 · Observed Nov 11, 22:00 local time via World Air Quality Index Project ground stations, US EPA index. Values in µg/m³.
Ground station · Hangzhou (杭州), 2.3 km away · median of 4 stations
Health signal
Everyone should limit long outdoor exertion; sensitive groups more so.
PM2.5
64.2
PM10
108.6
NO₂
—
O₃
—
SO₂
—
CO
—
Data: World Air Quality Index Project, Zhejiang Environmental Protection Bureau (浙江省环保厅门户)
- 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 Hangzhou's daily AQI at 116 on average, from 68 on Nov 9 to an hourly peak of 214 on Nov 11.
Where Hangzhou stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Hangzhou: Below target
28.3% tree cover against a 40% healthy-neighborhood target, across 12.44 km² of land.
Trees in this area
88,018
Target trees
124,407
More trees needed
36,389
CO₂ if planted / yr
800.6 t
Deforestation · 2001–2025
How much forest has Hangzhou lost?
Since 2001, the area within 10 km of Hangzhou has lost about 5 hectares of forest (about 7 football pitches): under 1% of the forest it had in 2000. Most of it (64%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from June 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 5 haabout 7 football pitches
- Share of its forest
- under 1%of what there was in 2000
- Cleared for good
- 3 hadeforestation: turned into farms, mines or towns
The worst year was 2025, when about 1 hectare 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 | 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 | 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 | 1 ha |
What is causing deforestation around Hangzhou?
- Towns and roadscleared for good62% · 3 ha
- Unknown causescause unknown38% · 2 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
- 5,380 ha
- Forest in 2020
- 6,830 ha
- Overall change
- +1,450 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Hangzhou grew from about 5,380 hectares to 6,830 hectares, a net gain of about 1,450 hectares (+27%). New forest grew on about 1,480 hectares, while 26 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 Hangzhou
What is the air quality (AQI) in Hangzhou right now?
The latest reading for Hangzhou shows an AQI of 157 (Unhealthy), measured Nov 11, 22:00 local time by 4 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Hangzhou (杭州), 2.3 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 Hangzhou today?
At AQI 157 (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 Hangzhou been like this week?
Over the last 7 days, the CAMS air-quality model put Hangzhou's daily AQI at 116 on average, from 68 on Nov 9 to an hourly peak of 214 on Nov 11. On 3 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Hangzhou lost since 2001?
Since 2001, the area within 10 km of Hangzhou has lost about 5 hectares of forest (about 7 football pitches): under 1% of the forest it had in 2000. Most of it (64%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Hangzhou grew from about 5,380 hectares to 6,830 hectares, a net gain of about 1,450 hectares (+27%). New forest grew on about 1,480 hectares, while 26 hectares were lost.
What is the tree count in Hangzhou?
Hangzhou has an estimated 88,018 trees across the 12.44 km² of land measured — 28.3% tree cover, 12 percentage points short of the 40% tree-cover target set for this area.
How many more trees does Hangzhou need?
Hangzhou needs roughly 36,389 more trees to close a 12-point shortfall against its 40% tree-cover target — about 800.6 t of extra CO₂ absorbed per year once grown.
How are Hangzhou's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Gongshu District, 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 Gongshu District; the tree count is an estimate derived from that cover.
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