City report · Hunan, China
Heshan Air quality today
Air quality in Heshan currently reads AQI 88 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 88
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 29.2
- tree cover
- 28.4%
- trees in this area
- 88.0K
- more trees needed
- 5.0K
Measured across a 2 km radius around Heshan District, Yiyang, Yiyang, 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.
Heshan · AQI 88 (Moderate)
Heshan's tree count comes to 87,972 trees across 12.39 km² of land, 2 points below the 30% tree-cover level considered healthy for this area, so roughly 4,956 more trees would close the gap.
Air quality detail
Air quality in Heshan today: AQI 88, Moderate
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 EPA, Yiyang (益阳市环保局), 1.3 km away
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
29.2
PM10
41.0
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
- 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 Heshan's daily AQI at 88 on average, from 69 on Nov 9 to an hourly peak of 165 on Nov 11.
Where Heshan stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Heshan: Below target
28.4% tree cover against a 30% healthy-neighborhood target, across 12.39 km² of land.
Trees in this area
87,972
Target trees
92,928
More trees needed
4,956
CO₂ if planted / yr
109.0 t
Deforestation · 2001–2025
How much forest has Heshan lost?
Since 2001, the area within 10 km of Heshan has lost about 527 hectares of forest (about 740 football pitches): 18% of the forest it had in 2000. Most of it (91%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from November 2017 of a 5 × 5 km area about 7 km south of the city center.
- Forest lost since 2001
- 527 haabout 740 football pitches
- Share of its forest
- 18%of what there was in 2000
- Cleared for good
- 482 hadeforestation: turned into farms, mines or towns
The worst year was 2007, when about 74 hectares of forest were lost.
Heshan's full deforestation reportHectares of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | 11 ha | under 1 ha | 12 ha |
| 2002 | 8 ha | under 1 ha | 8 ha |
| 2003 | 5 ha | under 1 ha | 5 ha |
| 2004 | 15 ha | under 1 ha | 15 ha |
| 2005 | 9 ha | under 1 ha | 9 ha |
| 2006 | 22 ha | under 1 ha | 22 ha |
| 2007 | 73 ha | under 1 ha | 74 ha |
| 2008 | 17 ha | under 1 ha | 17 ha |
| 2009 | 19 ha | under 1 ha | 20 ha |
| 2010 | 10 ha | under 1 ha | 10 ha |
| 2011 | 54 ha | 2 ha | 56 ha |
| 2012 | 25 ha | 4 ha | 29 ha |
| 2013 | 17 ha | 11 ha | 28 ha |
| 2014 | 10 ha | under 1 ha | 10 ha |
| 2015 | 7 ha | 10 ha | 16 ha |
| 2016 | 10 ha | 2 ha | 12 ha |
| 2017 | 15 ha | under 1 ha | 16 ha |
| 2018 | 10 ha | under 1 ha | 10 ha |
| 2019 | 5 ha | under 1 ha | 5 ha |
| 2020 | 41 ha | under 1 ha | 41 ha |
| 2021 | 61 ha | under 1 ha | 61 ha |
| 2022 | 15 ha | 1 ha | 16 ha |
| 2023 | 5 ha | 3 ha | 8 ha |
| 2024 | 12 ha | 1 ha | 13 ha |
| 2025 | 7 ha | 6 ha | 13 ha |
What is causing deforestation around Heshan?
- Towns and roadscleared for good91% · 482 ha
- Loggingcan grow back8.5% · 45 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
- 7,970 ha
- Forest in 2020
- 8,000 ha
- Overall change
- +31 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Heshan stayed about the same size, at about 8,000 hectares: new forest grew on about 607 hectares, and about 576 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 Heshan
What is the air quality (AQI) in Heshan right now?
The latest reading for Heshan shows an AQI of 88 (Moderate), measured Nov 11, 23:00 local time by the City EPA, Yiyang (益阳市环保局) ground monitoring station, 1.3 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 Heshan today?
At AQI 88 (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 Heshan been like this week?
Over the last 7 days, the CAMS air-quality model put Heshan's daily AQI at 88 on average, from 69 on Nov 9 to an hourly peak of 165 on Nov 11. On 1 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Heshan lost since 2001?
Since 2001, the area within 10 km of Heshan has lost about 527 hectares of forest (about 740 football pitches): 18% of the forest it had in 2000. Most of it (91%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Heshan stayed about the same size, at about 8,000 hectares: new forest grew on about 607 hectares, and about 576 hectares were lost.
What is the tree count in Heshan?
Heshan has an estimated 87,972 trees across the 12.39 km² of land measured — 28.4% tree cover, 2 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Heshan need?
Heshan needs roughly 4,956 more trees to close a 2-point shortfall against its 30% tree-cover target — about 109.0 t of extra CO₂ absorbed per year once grown.
How are Heshan's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Heshan 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 Heshan District; the tree count is an estimate derived from that cover.
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