City report · Chongqing, China
Bishan Air quality today
Air quality in Bishan currently reads AQI 151 (Unhealthy): Everyone should limit long outdoor exertion; sensitive groups more so.
Air quality right now
AQI 151
Unhealthy
- PM2.5, fine particles (µg/m³)
- 55.5
- tree cover
- 33.7%
- trees in this area
- 105K
- more trees needed
- 19.7K
Measured across a 2 km radius around Bishan District, Chongqing, China (12.57 km²), from a satellite image of Sep 9, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Bishan · AQI 151 (Unhealthy)
Bishan's tree count comes to 105,342 trees across 12.51 km² of land, 6 points below the 40% tree-cover level considered healthy for this area, so roughly 19,693 more trees would close the gap.
Air quality detail
Air quality in Bishan today: AQI 151, 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 · 剑山路, Chongqing (重庆剑山路), 1.2 km away · median of 3 stations
Health signal
Everyone should limit long outdoor exertion; sensitive groups more so.
PM2.5
55.5
PM10
91.4
NO₂
—
O₃
—
SO₂
—
CO
—
Data: World Air Quality Index Project, Chongqing Environmental Protection Bureau (重庆市主城区空气质量)
- 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 Bishan's daily AQI at 143 on average, from 92 on Nov 8 to an hourly peak of 241 on Nov 5.
Where Bishan stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Bishan: Below target
33.7% tree cover against a 40% healthy-neighborhood target, across 12.51 km² of land.
Trees in this area
105,342
Target trees
125,035
More trees needed
19,693
CO₂ if planted / yr
433.2 t
Deforestation · 2001–2025
How much forest has Bishan lost?
Since 2001, the area within 10 km of Bishan has lost about 361 hectares of forest (about 500 football pitches): 5.9% of the forest it had in 2000. Most of it (59%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from July 2017 of a 5 × 5 km area about 6 km southeast of the city center.
- Forest lost since 2001
- 361 haabout 500 football pitches
- Share of its forest
- 5.9%of what there was in 2000
- Cleared for good
- 213 hadeforestation: turned into farms, mines or towns
Forest loss is speeding up: about 51 hectares a year in 2021–2025, up from 4 hectares a year in 2016–2020. The worst year was 2025, when about 165 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 | 1 ha | 3 ha | 5 ha |
| 2003 | under 1 ha | 4 ha | 4 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 | 6 ha | 7 ha |
| 2007 | 5 ha | 25 ha | 31 ha |
| 2008 | under 1 ha | 2 ha | 2 ha |
| 2009 | 3 ha | 4 ha | 7 ha |
| 2010 | 3 ha | 10 ha | 12 ha |
| 2011 | 2 ha | 1 ha | 3 ha |
| 2012 | 2 ha | 2 ha | 3 ha |
| 2013 | 2 ha | 5 ha | 7 ha |
| 2014 | 3 ha | 1 ha | 4 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | 10 ha | under 1 ha | 10 ha |
| 2017 | 1 ha | under 1 ha | 2 ha |
| 2018 | 3 ha | under 1 ha | 3 ha |
| 2019 | 3 ha | under 1 ha | 3 ha |
| 2020 | 3 ha | under 1 ha | 4 ha |
| 2021 | 6 ha | under 1 ha | 6 ha |
| 2022 | 3 ha | under 1 ha | 3 ha |
| 2023 | 25 ha | 4 ha | 28 ha |
| 2024 | 35 ha | 14 ha | 49 ha |
| 2025 | 100 ha | 65 ha | 165 ha |
What is causing deforestation around Bishan?
- Towns and roadscleared for good55% · 197 ha
- Loggingcan grow back30% · 107 ha
- Farms, pasture and plantationscleared for good4.1% · 15 ha
Also: mining and energy, unknown causes.
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
- 15,800 ha
- Forest in 2020
- 15,800 ha
- Overall change
- +13 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Bishan stayed about the same size, at about 15,800 hectares: new forest grew on about 276 hectares, and about 263 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 Bishan
What is the air quality (AQI) in Bishan right now?
The latest reading for Bishan shows an AQI of 151 (Unhealthy), measured Nov 11, 22:00 local time by 3 ground monitoring stations via OpenAQ (the median of their readings; the nearest is 剑山路, Chongqing (重庆剑山路), 1.2 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 Bishan today?
At AQI 151 (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 Bishan been like this week?
Over the last 7 days, the CAMS air-quality model put Bishan's daily AQI at 143 on average, from 92 on Nov 8 to an hourly peak of 241 on Nov 5. On 6 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Bishan lost since 2001?
Since 2001, the area within 10 km of Bishan has lost about 361 hectares of forest (about 500 football pitches): 5.9% of the forest it had in 2000. Most of it (59%) was deforestation, forest cleared for good, mainly for towns and roads. Forest loss is speeding up: about 51 hectares a year in 2021–2025, up from 4 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Bishan stayed about the same size, at about 15,800 hectares: new forest grew on about 276 hectares, and about 263 hectares were lost.
What is the tree count in Bishan?
Bishan has an estimated 105,342 trees across the 12.51 km² of land measured — 33.7% tree cover, 6 percentage points short of the 40% tree-cover target set for this area.
How many more trees does Bishan need?
Bishan needs roughly 19,693 more trees to close a 6-point shortfall against its 40% tree-cover target — about 433.2 t of extra CO₂ absorbed per year once grown.
How are Bishan's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Bishan 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 Bishan District; the tree count is an estimate derived from that cover.
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