City report · Chongqing, China
Hechuan Air quality today
Air quality in Hechuan currently reads AQI 159 (Unhealthy): Everyone should limit long outdoor exertion; sensitive groups more so.
Air quality right now
AQI 159
Unhealthy
- PM2.5, fine particles (µg/m³)
- 67.1
- tree cover
- 27.6%
- trees in this area
- 72.1K
- more trees needed
- 32.4K
Measured across a 2 km radius around Hechuan District, Chongqing, China (12.57 km²), from a satellite image of Sep 4, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Hechuan · AQI 159 (Unhealthy)
Hechuan's tree count comes to 72,141 trees across 10.46 km² of land, 12 points below the 40% tree-cover level considered healthy for this area, so roughly 32,411 more trees would close the gap.
Air quality detail
Air quality in Hechuan today: AQI 159, 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 · College Road, Chongqing (重庆书院路), 1.7 km away
Health signal
Everyone should limit long outdoor exertion; sensitive groups more so.
PM2.5
67.1
PM10
79.2
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 Hechuan's daily AQI at 115 on average, from 68 on Nov 8 to an hourly peak of 191 on Nov 5.
Where Hechuan stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Hechuan: Below target
27.6% tree cover against a 40% healthy-neighborhood target, across 10.46 km² of land.
Trees in this area
72,141
Target trees
104,552
More trees needed
32,411
CO₂ if planted / yr
713.0 t
Deforestation · 2001–2025
How much forest has Hechuan lost?
Since 2001, the area within 10 km of Hechuan has lost about 42 hectares of forest (about 59 football pitches): 1.1% of the forest it had in 2000. Most of it (87%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from August 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 42 haabout 59 football pitches
- Share of its forest
- 1.1%of what there was in 2000
- Cleared for good
- 37 hadeforestation: turned into farms, mines or towns
The worst year was 2013, when about 5 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 | 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 | 3 ha | under 1 ha | 3 ha |
| 2010 | 3 ha | under 1 ha | 4 ha |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | 2 ha | 1 ha | 3 ha |
| 2013 | 5 ha | under 1 ha | 5 ha |
| 2014 | 2 ha | under 1 ha | 3 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | under 1 ha | under 1 ha | under 1 ha |
| 2017 | 2 ha | under 1 ha | 2 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 | 5 ha | under 1 ha | 5 ha |
| 2022 | 4 ha | under 1 ha | 5 ha |
| 2023 | 2 ha | under 1 ha | 2 ha |
| 2024 | 3 ha | under 1 ha | 3 ha |
| 2025 | 2 ha | under 1 ha | 2 ha |
What is causing deforestation around Hechuan?
- Towns and roadscleared for good83% · 35 ha
- Farms, pasture and plantationscleared for good3.1% · 1 ha
- Mining and energycleared for good1.7% · under 1 ha
Also: 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
- 15,600 ha
- Forest in 2020
- 15,600 ha
- Overall change
- +35 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Hechuan stayed about the same size, at about 15,600 hectares: new forest grew on about 218 hectares, and about 183 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 Hechuan
What is the air quality (AQI) in Hechuan right now?
The latest reading for Hechuan shows an AQI of 159 (Unhealthy), measured Nov 11, 22:00 local time by the College Road, Chongqing (重庆书院路) ground monitoring station, 1.7 km away, via OpenAQ. The main pollutant is PM2.5. Everyone should limit long outdoor exertion; sensitive groups more so.
Is it safe to exercise outside in Hechuan today?
At AQI 159 (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 Hechuan been like this week?
Over the last 7 days, the CAMS air-quality model put Hechuan's daily AQI at 115 on average, from 68 on Nov 8 to an hourly peak of 191 on Nov 5. On 5 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Hechuan lost since 2001?
Since 2001, the area within 10 km of Hechuan has lost about 42 hectares of forest (about 59 football pitches): 1.1% of the forest it had in 2000. Most of it (87%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Hechuan stayed about the same size, at about 15,600 hectares: new forest grew on about 218 hectares, and about 183 hectares were lost.
What is the tree count in Hechuan?
Hechuan has an estimated 72,141 trees across the 10.46 km² of land measured — 27.6% tree cover, 12 percentage points short of the 40% tree-cover target set for this area.
How many more trees does Hechuan need?
Hechuan needs roughly 32,411 more trees to close a 12-point shortfall against its 40% tree-cover target — about 713.0 t of extra CO₂ absorbed per year once grown.
How are Hechuan's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Hechuan 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 Hechuan District; the tree count is an estimate derived from that cover.
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