City report · Jiangsu, China
Changzhou Air quality today
Air quality in Changzhou currently reads AQI 163 (Unhealthy): Everyone should limit long outdoor exertion; sensitive groups more so.
AQI 163
Air quality right now
Unhealthy
- PM2.5, fine particles (µg/m³)
- 72.9
- tree cover
- 22.5%
- trees in this area
- 70.4K
- more trees needed
- 54.8K
Measured across a 2 km radius around Zhonglou District, Changzhou, 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.
Changzhou · AQI 163 (Unhealthy)
Changzhou's tree count comes to 70,403 trees across 12.52 km² of land, 18 points below the 40% tree-cover level considered healthy for this area, so roughly 54,758 more trees would close the gap.
Air quality detail
Air quality in Changzhou today: AQI 163, 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 · Changzhou (常州), 4.3 km away · median of 3 stations
Health signal
Everyone should limit long outdoor exertion; sensitive groups more so.
PM2.5
72.9
PM10
117.6
NO₂
—
O₃
—
SO₂
—
CO
—
Data: World Air Quality Index Project, Jiangsu Environmental Protection public network (江苏省城市空气PM2.5等试运行监测数据平台), Jiangsu Province PM2.5 Air Monitoring Comission (江苏省城市空气PM2.5等试运行监测数据平台)
- 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 Changzhou's daily AQI at 115 on average, from 55 on Nov 9 to an hourly peak of 238 on Nov 11.
Where Changzhou stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Changzhou: Critically low
22.5% tree cover against a 40% healthy-neighborhood target, across 12.52 km² of land.
Trees in this area
70,403
Target trees
125,161
More trees needed
54,758
CO₂ if planted / yr
1,205 t
Deforestation · 2001–2025
How much forest has Changzhou lost?
There was almost no forest around Changzhou in 2000, so there has been almost nothing to lose since. Only fairly dense woodland counts as forest in these maps, so scattered street and garden trees don't show up here.
2017: satellite photo from July 2017 of a 5 × 5 km area in the city center.
Forest gained and lost, 2000–2020
- Forest in 2000
- 1,260 ha
- Forest in 2020
- 2,010 ha
- Overall change
- +749 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Changzhou grew from about 1,260 hectares to 2,010 hectares, a net gain of about 749 hectares (+59%). New forest grew on about 752 hectares, while 3 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 Changzhou
What is the air quality (AQI) in Changzhou right now?
The latest reading for Changzhou shows an AQI of 163 (Unhealthy), measured Nov 11, 22:00 local time by 3 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Changzhou (常州), 4.3 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 Changzhou today?
At AQI 163 (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 Changzhou been like this week?
Over the last 7 days, the CAMS air-quality model put Changzhou's daily AQI at 115 on average, from 55 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 Changzhou lost since 2001?
There was almost no forest around Changzhou in 2000, so there has been almost nothing to lose 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 Changzhou grew from about 1,260 hectares to 2,010 hectares, a net gain of about 749 hectares (+59%). New forest grew on about 752 hectares, while 3 hectares were lost.
What is the tree count in Changzhou?
Changzhou has an estimated 70,403 trees across the 12.52 km² of land measured — 22.5% tree cover, 18 percentage points short of the 40% tree-cover target set for this area.
How many more trees does Changzhou need?
Changzhou needs roughly 54,758 more trees to close a 18-point shortfall against its 40% tree-cover target — about 1,205 t of extra CO₂ absorbed per year once grown.
How are Changzhou's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Zhonglou 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 Zhonglou District; the tree count is an estimate derived from that cover.
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