City report · Shanghai, China
Changzheng Air quality today
Air quality in Changzheng currently reads AQI 82 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 82
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 25.9
- tree cover
- 28.0%
- trees in this area
- 87.7K
- more trees needed
- 6.3K
Measured across a 2 km radius around Putuo, Shanghai, China (12.57 km²), from a satellite image of Sep 14, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Changzheng · AQI 82 (Moderate)
Changzheng's tree count comes to 87,701 trees across 12.53 km² of land, 2 points below the 30% tree-cover level considered healthy for this area, so roughly 6,264 more trees would close the gap.
Air quality detail
Air quality in Changzheng today: AQI 82, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 23:00 local time via World Air Quality Index Project ground stations, US EPA index. Values in µg/m³.
Ground station · Putuo Taopu, Shanghai (普陀桃浦), 4.5 km away · median of 5 stations
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
25.9
PM10
33.5
NO₂
—
O₃
—
SO₂
—
CO
—
Data: World Air Quality Index Project, Shanghai Environment Monitoring Center(上海市环境监测中心)
- 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 Changzheng's daily AQI at 100 on average, from 66 on Nov 9 to an hourly peak of 196 on Nov 10.
Where Changzheng stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Changzheng: Below target
28.0% tree cover against a 30% healthy-neighborhood target, across 12.53 km² of land.
Trees in this area
87,701
Target trees
93,965
More trees needed
6,264
CO₂ if planted / yr
137.8 t
Deforestation · 2001–2025
How much forest has Changzheng lost?
There was almost no forest around Changzheng 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
- 1,410 ha
- Forest in 2020
- 4,010 ha
- Overall change
- +2,600 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Changzheng grew from about 1,410 hectares to 4,010 hectares, a net gain of about 2,600 hectares (+184%). New forest grew on about 2,600 hectares, while under 1 hectare was 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 Changzheng
What is the air quality (AQI) in Changzheng right now?
The latest reading for Changzheng shows an AQI of 82 (Moderate), measured Nov 11, 23:00 local time by 5 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Putuo Taopu, Shanghai (普陀桃浦), 4.5 km away). The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Changzheng today?
At AQI 82 (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 Changzheng been like this week?
Over the last 7 days, the CAMS air-quality model put Changzheng's daily AQI at 100 on average, from 66 on Nov 9 to an hourly peak of 196 on Nov 10. On 2 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Changzheng lost since 2001?
There was almost no forest around Changzheng 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 Changzheng grew from about 1,410 hectares to 4,010 hectares, a net gain of about 2,600 hectares (+184%). New forest grew on about 2,600 hectares, while under 1 hectare was lost.
What is the tree count in Changzheng?
Changzheng has an estimated 87,701 trees across the 12.53 km² of land measured — 28.0% tree cover, 2 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Changzheng need?
Changzheng needs roughly 6,264 more trees to close a 2-point shortfall against its 30% tree-cover target — about 137.8 t of extra CO₂ absorbed per year once grown.
How are Changzheng's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Putuo, 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 Putuo; the tree count is an estimate derived from that cover.
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