City report · Chongqing, China
Hanfeng Air quality today
Air quality in Hanfeng currently reads AQI 99 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 99
Moderate
- PM2.5, fine particles (µg/m³)
- 34.9
- tree cover
- 52.9%
- trees in this area
- 149K
- more trees needed
- 0
Measured across a 2 km radius around Kaizhou 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.
Hanfeng · AQI 99 (Moderate)
Hanfeng's tree count comes to 149,239 trees across 11.29 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Hanfeng today: AQI 99, Moderate
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 · Ankang, Chongqing (重庆安康), 1.7 km away
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
34.9
PM10
61.1
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
- 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 Hanfeng's daily AQI at 86 on average, from 72 on Nov 4 to an hourly peak of 153 on Nov 7.
Where Hanfeng stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Hanfeng: Healthy tree cover
52.9% tree cover against a 30% healthy-neighborhood target, across 11.29 km² of land.
Trees in this area
149,239
Target trees
149,239
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Hanfeng lost?
Since 2001, the area within 10 km of Hanfeng has lost about 25 hectares of forest (about 35 football pitches): under 1% of the forest it had in 2000. Most of it (90%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from July 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 25 haabout 35 football pitches
- Share of its forest
- under 1%of what there was in 2000
- Cleared for good
- 23 hadeforestation: turned into farms, mines or towns
The worst year was 2025, when about 6 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 | 2 ha | under 1 ha | 2 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 | 2 ha | under 1 ha | 2 ha |
| 2018 | 1 ha | under 1 ha | 1 ha |
| 2019 | under 1 ha | under 1 ha | 1 ha |
| 2020 | under 1 ha | under 1 ha | under 1 ha |
| 2021 | 2 ha | under 1 ha | 3 ha |
| 2022 | 2 ha | under 1 ha | 2 ha |
| 2023 | 2 ha | under 1 ha | 2 ha |
| 2024 | 3 ha | under 1 ha | 3 ha |
| 2025 | 5 ha | under 1 ha | 6 ha |
What is causing deforestation around Hanfeng?
- Towns and roadscleared for good77% · 19 ha
- Farms, pasture and plantationscleared for good13% · 3 ha
- Unknown causescause unknown9.6% · 2 ha
Also: logging.
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
- 19,400 ha
- Forest in 2020
- 19,900 ha
- Overall change
- +518 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Hanfeng grew from about 19,400 hectares to 19,900 hectares, a net gain of about 518 hectares (+2.7%). New forest grew on about 626 hectares, while 108 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 Hanfeng
What is the air quality (AQI) in Hanfeng right now?
The latest reading for Hanfeng shows an AQI of 99 (Moderate), measured Nov 11, 22:00 local time by the Ankang, Chongqing (重庆安康) ground monitoring station, 1.7 km away, via OpenAQ. The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Hanfeng today?
At AQI 99 (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 Hanfeng been like this week?
Over the last 7 days, the CAMS air-quality model put Hanfeng's daily AQI at 86 on average, from 72 on Nov 4 to an hourly peak of 153 on Nov 7. On 1 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Hanfeng lost since 2001?
Since 2001, the area within 10 km of Hanfeng has lost about 25 hectares of forest (about 35 football pitches): under 1% of the forest it had in 2000. Most of it (90%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Hanfeng grew from about 19,400 hectares to 19,900 hectares, a net gain of about 518 hectares (+2.7%). New forest grew on about 626 hectares, while 108 hectares were lost.
What is the tree count in Hanfeng?
Hanfeng has an estimated 149,239 trees across the 11.29 km² of land measured — 52.9% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Hanfeng need?
Hanfeng has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Hanfeng's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Kaizhou 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 Kaizhou District; the tree count is an estimate derived from that cover.
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