City report · Anhui, China
Chaohu Air quality today
Air quality in Chaohu currently reads AQI 73 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 73
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 26.6
- tree cover
- 25.8%
- trees in this area
- 78.9K
- more trees needed
- 12.8K
Measured across a 2 km radius around Chaohu, Hefei, Anhui, China (12.57 km²), from a satellite image of Aug 3, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Chaohu · AQI 73 (Moderate)
Chaohu's tree count comes to 78,865 trees across 12.23 km² of land, 4 points below the 30% tree-cover level considered healthy for this area, so roughly 12,838 more trees would close the gap.
Air quality detail
Air quality in Chaohu today: AQI 73, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 19:00 local time via Open-Meteo / CAMS, corrected with 9 ground-station cities within 165 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 9 station cities within 165 km, e.g. Wuhu and Maanshan
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
26.6
PM10
39.8
NO₂
68.5
O₃
12.0
SO₂
9.7
CO
563.0
- 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 Chaohu's daily AQI at 95 on average, from 65 on Nov 9 to an hourly peak of 175 on Nov 6.
Where Chaohu stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Chaohu: Below target
25.8% tree cover against a 30% healthy-neighborhood target, across 12.23 km² of land.
Trees in this area
78,865
Target trees
91,703
More trees needed
12,838
CO₂ if planted / yr
282.4 t
Deforestation · 2001–2025
How much forest has Chaohu lost?
Since 2001, the area within 10 km of Chaohu has lost about 408 hectares of forest (about 570 football pitches): 12% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 107 hectares (26%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from August 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 408 haabout 570 football pitches
- Share of its forest
- 12%of what there was in 2000
- Cleared for good
- 107 hadeforestation: turned into farms, mines or towns
The worst year was 2010, when about 112 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 | 4 ha | 6 ha | 10 ha |
| 2002 | 3 ha | 20 ha | 23 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | under 1 ha | 2 ha | 2 ha |
| 2005 | 4 ha | 14 ha | 18 ha |
| 2006 | 15 ha | 34 ha | 48 ha |
| 2007 | 19 ha | 40 ha | 59 ha |
| 2008 | 7 ha | 6 ha | 13 ha |
| 2009 | 4 ha | 20 ha | 24 ha |
| 2010 | 22 ha | 90 ha | 112 ha |
| 2011 | under 1 ha | 13 ha | 14 ha |
| 2012 | 7 ha | 17 ha | 24 ha |
| 2013 | under 1 ha | 3 ha | 3 ha |
| 2014 | 2 ha | 6 ha | 7 ha |
| 2015 | under 1 ha | 4 ha | 4 ha |
| 2016 | 1 ha | 3 ha | 4 ha |
| 2017 | 2 ha | 1 ha | 3 ha |
| 2018 | 1 ha | 10 ha | 11 ha |
| 2019 | 6 ha | 1 ha | 7 ha |
| 2020 | 2 ha | 2 ha | 3 ha |
| 2021 | under 1 ha | 5 ha | 6 ha |
| 2022 | 2 ha | 3 ha | 5 ha |
| 2023 | 3 ha | under 1 ha | 3 ha |
| 2024 | under 1 ha | 1 ha | 1 ha |
| 2025 | under 1 ha | 3 ha | 4 ha |
What is causing deforestation around Chaohu?
- Loggingcan grow back73% · 298 ha
- Towns and roadscleared for good18% · 72 ha
- Farms, pasture and plantationscleared for good5% · 20 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
- 6,470 ha
- Forest in 2020
- 6,780 ha
- Overall change
- +312 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Chaohu grew from about 6,470 hectares to 6,780 hectares, a net gain of about 312 hectares (+4.8%). New forest grew on about 546 hectares, while 234 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 Chaohu
What is the air quality (AQI) in Chaohu right now?
The latest reading for Chaohu shows an AQI of 73 (Moderate), observed Nov 11, 19:00 local time via Open-Meteo / CAMS, corrected with 9 ground-station cities within 165 km, US EPA index. The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Chaohu today?
At AQI 73 (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 Chaohu been like this week?
Over the last 7 days, the CAMS air-quality model put Chaohu's daily AQI at 95 on average, from 65 on Nov 9 to an hourly peak of 175 on Nov 6. On 2 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Chaohu lost since 2001?
Since 2001, the area within 10 km of Chaohu has lost about 408 hectares of forest (about 570 football pitches): 12% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 107 hectares (26%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Chaohu grew from about 6,470 hectares to 6,780 hectares, a net gain of about 312 hectares (+4.8%). New forest grew on about 546 hectares, while 234 hectares were lost.
What is the tree count in Chaohu?
Chaohu has an estimated 78,865 trees across the 12.23 km² of land measured — 25.8% tree cover, 4 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Chaohu need?
Chaohu needs roughly 12,838 more trees to close a 4-point shortfall against its 30% tree-cover target — about 282.4 t of extra CO₂ absorbed per year once grown.
How are Chaohu's air quality and tree cover measured?
Air quality comes from ground monitoring stations via OpenAQ where one reports nearby, and otherwise, as here, from the Open-Meteo / CAMS model, which may differ from street-level monitors. 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 Chaohu; the tree count is an estimate derived from that cover.
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