City report · Jiangsu, China
Changshu Air quality today
Air quality in Changshu currently reads AQI 167 (Unhealthy): Everyone should limit long outdoor exertion; sensitive groups more so.
Air quality right now
AQI 167
Unhealthy
- PM2.5, fine particles (µg/m³)
- 87.2
- tree cover
- 20.8%
- trees in this area
- 63.7K
- more trees needed
- 58.8K
Measured across a 2 km radius around Changshu, Suzhou, Jiangsu, China (12.57 km²), from a satellite image of Jul 31, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Changshu · AQI 167 (Unhealthy)
Changshu's tree count comes to 63,711 trees across 12.26 km² of land, 19 points below the 40% tree-cover level considered healthy for this area, so roughly 58,811 more trees would close the gap.
Air quality detail
Air quality in Changshu today: AQI 167, Unhealthy
Main pollutant: PM2.5 · Observed Nov 10, 21:00 local time via Open-Meteo / CAMS, corrected with 34 ground-station cities within 225 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 34 station cities within 225 km, e.g. Suzhou and Suzhou
Health signal
Everyone should limit long outdoor exertion; sensitive groups more so.
PM2.5
87.2
PM10
130.4
NO₂
69.1
O₃
0.0
SO₂
21.9
CO
1016.0
- 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 Changshu's daily AQI at 90 on average, from 58 on Nov 9 to an hourly peak of 190 on Nov 10.
Where Changshu stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Changshu: Critically low
20.8% tree cover against a 40% healthy-neighborhood target, across 12.26 km² of land.
Trees in this area
63,711
Target trees
122,522
More trees needed
58,811
CO₂ if planted / yr
1,294 t
Deforestation · 2001–2025
How much forest has Changshu lost?
Since 2001, the area within 10 km of Changshu has lost about 6 hectares of forest (about 8 football pitches): under 1% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 1 hectare (22%) was deforestation: forest cleared for good for farms, mines or towns.
2019: satellite photo from June 2019 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 6 haabout 8 football pitches
- Share of its forest
- under 1%of what there was in 2000
- Cleared for good
- 1 hadeforestation: turned into farms, mines or towns
The worst year was 2019, when about 4 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 | 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 | 4 ha | 4 ha |
| 2020 | under 1 ha | under 1 ha | 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 Changshu?
- Loggingcan grow back65% · 4 ha
- Towns and roadscleared for good20% · 1 ha
- Unknown causescause unknown12% · under 1 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
- 2,550 ha
- Forest in 2020
- 3,820 ha
- Overall change
- +1,280 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Changshu grew from about 2,550 hectares to 3,820 hectares, a net gain of about 1,280 hectares (+50%). New forest grew on about 1,290 hectares, while 11 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 Changshu
What is the air quality (AQI) in Changshu right now?
The latest reading for Changshu shows an AQI of 167 (Unhealthy), observed Nov 10, 21:00 local time via Open-Meteo / CAMS, corrected with 34 ground-station cities within 225 km, US EPA index. The main pollutant is PM2.5. Everyone should limit long outdoor exertion; sensitive groups more so.
Is it safe to exercise outside in Changshu today?
At AQI 167 (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 Changshu been like this week?
Over the last 7 days, the CAMS air-quality model put Changshu's daily AQI at 90 on average, from 58 on Nov 9 to an hourly peak of 190 on Nov 10. On 2 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Changshu lost since 2001?
Since 2001, the area within 10 km of Changshu has lost about 6 hectares of forest (about 8 football pitches): under 1% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 1 hectare (22%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Changshu grew from about 2,550 hectares to 3,820 hectares, a net gain of about 1,280 hectares (+50%). New forest grew on about 1,290 hectares, while 11 hectares were lost.
What is the tree count in Changshu?
Changshu has an estimated 63,711 trees across the 12.26 km² of land measured — 20.8% tree cover, 19 percentage points short of the 40% tree-cover target set for this area.
How many more trees does Changshu need?
Changshu needs roughly 58,811 more trees to close a 19-point shortfall against its 40% tree-cover target — about 1,294 t of extra CO₂ absorbed per year once grown.
How are Changshu'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 Changshu; the tree count is an estimate derived from that cover.
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