City report · Guangdong, China
Hepo Air quality today
Air quality in Hepo currently reads AQI 79 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 79
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 24.0
- tree cover
- 28.4%
- trees in this area
- 87.1K
- more trees needed
- 4.9K
Measured across a 2 km radius around Jiexi County, Jieyang, Guangdong Province, China (12.57 km²), from a satellite image of Sep 24, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Hepo · AQI 79 (Moderate)
Hepo's tree count comes to 87,080 trees across 12.27 km² of land, 2 points below the 30% tree-cover level considered healthy for this area, so roughly 4,906 more trees would close the gap.
Air quality detail
Air quality in Hepo today: AQI 79, 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 · 揭西河婆, (揭阳市揭西河婆), 4 km away
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
24.0
PM10
45.4
NO₂
—
O₃
—
SO₂
—
CO
—
Data: World Air Quality Index Project, Guangdong Environmental Protection public network (广东环境保护公众网)
- 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 Hepo's daily AQI at 68 on average, from 42 on Nov 10 to an hourly peak of 132 on Nov 5.
Where Hepo stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Hepo: Below target
28.4% tree cover against a 30% healthy-neighborhood target, across 12.27 km² of land.
Trees in this area
87,080
Target trees
91,986
More trees needed
4,906
CO₂ if planted / yr
107.9 t
Deforestation · 2001–2025
How much forest has Hepo lost?
Since 2001, the area within 10 km of Hepo has lost about 3,410 hectares of forest (about 4,800 football pitches): 23% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 215 hectares (6.3%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from January 2017 of a 5 × 5 km area about 7 km southeast of the city center.
- Forest lost since 2001
- 3,410 haabout 4,800 football pitches
- Share of its forest
- 23%of what there was in 2000
- Cleared for good
- 215 hadeforestation: turned into farms, mines or towns
Forest loss has stayed about the same: about 119 hectares a year in 2021–2025, against 122 hectares a year in 2016–2020. The worst year was 2011, when about 346 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 | 5 ha | 11 ha | 16 ha |
| 2002 | 1 ha | 71 ha | 72 ha |
| 2003 | under 1 ha | 16 ha | 16 ha |
| 2004 | 7 ha | 55 ha | 62 ha |
| 2005 | 6 ha | 37 ha | 42 ha |
| 2006 | 9 ha | 75 ha | 84 ha |
| 2007 | 3 ha | 84 ha | 87 ha |
| 2008 | 5 ha | 236 ha | 241 ha |
| 2009 | 4 ha | 103 ha | 107 ha |
| 2010 | 3 ha | 154 ha | 157 ha |
| 2011 | 9 ha | 337 ha | 346 ha |
| 2012 | 10 ha | 231 ha | 241 ha |
| 2013 | 26 ha | 215 ha | 241 ha |
| 2014 | 43 ha | 258 ha | 301 ha |
| 2015 | 6 ha | 184 ha | 190 ha |
| 2016 | 5 ha | 192 ha | 197 ha |
| 2017 | 15 ha | 167 ha | 182 ha |
| 2018 | 8 ha | 109 ha | 117 ha |
| 2019 | 12 ha | 50 ha | 62 ha |
| 2020 | 2 ha | 50 ha | 53 ha |
| 2021 | 7 ha | 78 ha | 85 ha |
| 2022 | 12 ha | 168 ha | 180 ha |
| 2023 | 4 ha | 121 ha | 124 ha |
| 2024 | 2 ha | 104 ha | 106 ha |
| 2025 | 12 ha | 87 ha | 99 ha |
What is causing deforestation around Hepo?
- Loggingcan grow back93% · 3,160 ha
- Towns and roadscleared for good5.5% · 186 ha
Also: shifting farming, mining and energy, farms, pasture and plantations, wildfires, 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
- 20,700 ha
- Forest in 2020
- 20,300 ha
- Overall change
- −378 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Hepo stayed about the same size, at about 20,300 hectares: new forest grew on about 389 hectares, and about 767 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 Hepo
What is the air quality (AQI) in Hepo right now?
The latest reading for Hepo shows an AQI of 79 (Moderate), measured Nov 11, 23:00 local time by the 揭西河婆, (揭阳市揭西河婆) ground monitoring station, 4 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 Hepo today?
At AQI 79 (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 Hepo been like this week?
Over the last 7 days, the CAMS air-quality model put Hepo's daily AQI at 68 on average, from 42 on Nov 10 to an hourly peak of 132 on Nov 5. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Hepo lost since 2001?
Since 2001, the area within 10 km of Hepo has lost about 3,410 hectares of forest (about 4,800 football pitches): 23% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 215 hectares (6.3%) was deforestation: forest cleared for good for farms, mines or towns. Forest loss has stayed about the same: about 119 hectares a year in 2021–2025, against 122 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Hepo stayed about the same size, at about 20,300 hectares: new forest grew on about 389 hectares, and about 767 hectares were lost.
What is the tree count in Hepo?
Hepo has an estimated 87,080 trees across the 12.27 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 Hepo need?
Hepo needs roughly 4,906 more trees to close a 2-point shortfall against its 30% tree-cover target — about 107.9 t of extra CO₂ absorbed per year once grown.
How are Hepo's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Jiexi County, 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 Jiexi County; the tree count is an estimate derived from that cover.
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