City report · Jiangsu, China
Zhangjiagang Air quality today
Air quality in Zhangjiagang currently reads AQI 165 (Unhealthy): Everyone should limit long outdoor exertion; sensitive groups more so.
AQI 165
Air quality right now
Unhealthy
- PM2.5, fine particles (µg/m³)
- 71.0
- tree cover
- 26.8%
- trees in this area
- 83.9K
- more trees needed
- 41.3K
Measured across a 2 km radius around Zhangjiagang, Suzhou, Jiangsu, China (12.57 km²), from a satellite image of Jun 1, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Zhangjiagang · AQI 165 (Unhealthy)
Zhangjiagang's tree count comes to 83,858 trees across 12.52 km² of land, 13 points below the 40% tree-cover level considered healthy for this area, so roughly 41,303 more trees would close the gap.
Air quality detail
Air quality in Zhangjiagang today: AQI 165, Unhealthy
Main pollutant: PM2.5 · Observed Nov 11, 06:00 local time via Open-Meteo / CAMS, corrected with 19 ground-station cities within 205 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 19 station cities within 205 km, e.g. Suzhou and Suzhou
Health signal
Everyone should limit long outdoor exertion; sensitive groups more so.
PM2.5
71.0
PM10
138.3
NO₂
60.7
O₃
0.0
SO₂
34.4
CO
1814.0
- 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 Zhangjiagang's daily AQI at 109 on average, from 53 on Nov 9 to an hourly peak of 238 on Nov 11.
Where Zhangjiagang stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Zhangjiagang: Below target
26.8% tree cover against a 40% healthy-neighborhood target, across 12.52 km² of land.
Trees in this area
83,858
Target trees
125,161
More trees needed
41,303
CO₂ if planted / yr
908.7 t
Deforestation · 2001–2025
How much forest has Zhangjiagang lost?
There was very little forest around Zhangjiagang in 2000, about 100 hectares, and about 3 hectares of it has been lost since. Only fairly dense woodland counts as forest in these maps, so scattered street and garden trees don't show up here.
2019: satellite photo from June 2019 of a 5 × 5 km area in the city center.
The worst year was 2024, when about 2 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 | 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 | 2 ha | 2 ha |
| 2025 | under 1 ha | under 1 ha | under 1 ha |
What is causing deforestation around Zhangjiagang?
- Loggingcan grow back60% · 2 ha
- Towns and roadscleared for good30% · under 1 ha
- Unknown causescause unknown10% · 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
- 2,510 ha
- Forest in 2020
- 3,860 ha
- Overall change
- +1,350 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Zhangjiagang grew from about 2,510 hectares to 3,860 hectares, a net gain of about 1,350 hectares (+54%). New forest grew on about 1,360 hectares, while 6 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 Zhangjiagang
What is the air quality (AQI) in Zhangjiagang right now?
The latest reading for Zhangjiagang shows an AQI of 165 (Unhealthy), observed Nov 11, 06:00 local time via Open-Meteo / CAMS, corrected with 19 ground-station cities within 205 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 Zhangjiagang today?
At AQI 165 (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 Zhangjiagang been like this week?
Over the last 7 days, the CAMS air-quality model put Zhangjiagang's daily AQI at 109 on average, from 53 on Nov 9 to an hourly peak of 238 on Nov 11. On 3 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Zhangjiagang lost since 2001?
There was very little forest around Zhangjiagang in 2000, about 100 hectares, and about 3 hectares of it has been lost since. Only fairly dense woodland counts as forest in these maps, so scattered street and garden trees don't show up here. Comparing satellite maps from 2000 and 2020, the forest around Zhangjiagang grew from about 2,510 hectares to 3,860 hectares, a net gain of about 1,350 hectares (+54%). New forest grew on about 1,360 hectares, while 6 hectares were lost.
What is the tree count in Zhangjiagang?
Zhangjiagang has an estimated 83,858 trees across the 12.52 km² of land measured — 26.8% tree cover, 13 percentage points short of the 40% tree-cover target set for this area.
How many more trees does Zhangjiagang need?
Zhangjiagang needs roughly 41,303 more trees to close a 13-point shortfall against its 40% tree-cover target — about 908.7 t of extra CO₂ absorbed per year once grown.
How are Zhangjiagang'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 Zhangjiagang; the tree count is an estimate derived from that cover.
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