City report · Hunan, China
Hengyang Air quality today
Air quality in Hengyang currently reads AQI 107 (Unhealthy for sensitive groups): Sensitive groups should limit long or intense outdoor activity.
Air quality right now
AQI 107
Unhealthy for sensitive groups
- PM2.5, fine particles (µg/m³)
- 37.9
- tree cover
- 19.3%
- trees in this area
- 52.2K
- more trees needed
- 42.5K
Measured across a 2 km radius around Yanfeng District, Hengyang, Hunan, China (12.57 km²), from a satellite image of Sep 13, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Hengyang · AQI 107 (Unhealthy for sensitive groups)
Hengyang's tree count comes to 52,205 trees across 10.82 km² of land, 16 points below the 35% tree-cover level considered healthy for this area, so roughly 42,467 more trees would close the gap.
Air quality detail
Air quality in Hengyang today: AQI 107, Unhealthy for sensitive groups
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 · City Monitoring Station, Hengyang (衡阳市监测站), 1.8 km away · median of 3 stations
Health signal
Sensitive groups should limit long or intense outdoor activity.
PM2.5
37.9
PM10
59.0
NO₂
—
O₃
—
SO₂
—
CO
—
Data: World Air Quality Index Project, Hunan Environmental Protection Agency (湖南省环境保护厅), China National Urban air quality real-time publishing platform (全国城市空气质量实时发布平台)
- Outdoor exercise
- Children, older adults and people with asthma or heart disease should cut down long or hard exercise
- Windows
- Close them to keep the outside air out
- Mask
- Sensitive groups: an N95 outdoors
- Air purifier
- Run one, especially in bedrooms
Over the last 7 days, the CAMS air-quality model put Hengyang's daily AQI at 74 on average, from 55 on Nov 8 to an hourly peak of 151 on Nov 11.
Where Hengyang stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Hengyang: Critically low
19.3% tree cover against a 35% healthy-neighborhood target, across 10.82 km² of land.
Trees in this area
52,205
Target trees
94,672
More trees needed
42,467
CO₂ if planted / yr
934.3 t
Deforestation · 2001–2025
How much forest has Hengyang lost?
Since 2001, the area within 10 km of Hengyang has lost about 114 hectares of forest (about 160 football pitches): 15% of the forest it had in 2000. Most of it (98%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from September 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 114 haabout 160 football pitches
- Share of its forest
- 15%of what there was in 2000
- Cleared for good
- 111 hadeforestation: turned into farms, mines or towns
The worst year was 2016, when about 18 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 | 2 ha | under 1 ha | 2 ha |
| 2002 | under 1 ha | under 1 ha | under 1 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | 2 ha | under 1 ha | 2 ha |
| 2005 | 2 ha | under 1 ha | 2 ha |
| 2006 | 3 ha | under 1 ha | 3 ha |
| 2007 | 5 ha | under 1 ha | 5 ha |
| 2008 | 3 ha | under 1 ha | 3 ha |
| 2009 | 7 ha | under 1 ha | 7 ha |
| 2010 | 7 ha | under 1 ha | 7 ha |
| 2011 | 1 ha | under 1 ha | 1 ha |
| 2012 | 7 ha | under 1 ha | 7 ha |
| 2013 | 4 ha | under 1 ha | 4 ha |
| 2014 | 3 ha | under 1 ha | 3 ha |
| 2015 | 13 ha | under 1 ha | 13 ha |
| 2016 | 18 ha | under 1 ha | 18 ha |
| 2017 | 7 ha | under 1 ha | 7 ha |
| 2018 | 10 ha | under 1 ha | 10 ha |
| 2019 | 2 ha | under 1 ha | 2 ha |
| 2020 | 5 ha | under 1 ha | 5 ha |
| 2021 | 3 ha | under 1 ha | 3 ha |
| 2022 | 3 ha | under 1 ha | 3 ha |
| 2023 | 2 ha | under 1 ha | 2 ha |
| 2024 | 4 ha | under 1 ha | 4 ha |
| 2025 | under 1 ha | under 1 ha | 1 ha |
What is causing deforestation around Hengyang?
- Towns and roadscleared for good98% · 111 ha
- Unknown causescause unknown2.5% · 3 ha
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
- 4,500 ha
- Forest in 2020
- 4,300 ha
- Overall change
- −206 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Hengyang shrank from about 4,500 hectares to 4,300 hectares, a net loss of about 206 hectares (−4.6%). New forest grew on about 275 hectares, but 481 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 Hengyang
What is the air quality (AQI) in Hengyang right now?
The latest reading for Hengyang shows an AQI of 107 (Unhealthy for sensitive groups), measured Nov 11, 23:00 local time by 3 ground monitoring stations via OpenAQ (the median of their readings; the nearest is City Monitoring Station, Hengyang (衡阳市监测站), 1.8 km away). The main pollutant is PM2.5. Sensitive groups should limit long or intense outdoor activity.
Is it safe to exercise outside in Hengyang today?
At AQI 107 (Unhealthy for sensitive groups): children, older adults and people with asthma or heart disease should cut down long or hard exercise. Windows: close them to keep the outside air out. Masks: sensitive groups: an N95 outdoors. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Hengyang been like this week?
Over the last 7 days, the CAMS air-quality model put Hengyang's daily AQI at 74 on average, from 55 on Nov 8 to an hourly peak of 151 on Nov 11. On 1 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Hengyang lost since 2001?
Since 2001, the area within 10 km of Hengyang has lost about 114 hectares of forest (about 160 football pitches): 15% of the forest it had in 2000. Most of it (98%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Hengyang shrank from about 4,500 hectares to 4,300 hectares, a net loss of about 206 hectares (−4.6%). New forest grew on about 275 hectares, but 481 hectares were lost.
What is the tree count in Hengyang?
Hengyang has an estimated 52,205 trees across the 10.82 km² of land measured — 19.3% tree cover, 16 percentage points short of the 35% tree-cover target set for this area.
How many more trees does Hengyang need?
Hengyang needs roughly 42,467 more trees to close a 16-point shortfall against its 35% tree-cover target — about 934.3 t of extra CO₂ absorbed per year once grown.
How are Hengyang's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Yanfeng 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 Yanfeng District; the tree count is an estimate derived from that cover.
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