City report · Guangdong, China
Humen Air quality today
Air quality in Humen currently reads AQI 91 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 91
Moderate
- PM2.5, fine particles (µg/m³)
- 30.6
- tree cover
- 13.1%
- trees in this area
- 39.3K
- more trees needed
- 50.8K
Measured across a 2 km radius around Dongguan, Guangdong Province, China (12.57 km²), from a satellite image of Aug 11, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Humen · AQI 91 (Moderate)
Humen's tree count comes to 39,344 trees across 12.02 km² of land, 17 points below the 30% tree-cover level considered healthy for this area, so roughly 50,757 more trees would close the gap.
Air quality detail
Air quality in Humen today: AQI 91, 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 · 虎门港, (东莞市虎门港), 5.2 km away · median of 2 stations
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
30.6
PM10
63.1
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 Humen's daily AQI at 83 on average, from 54 on Nov 9 to an hourly peak of 177 on Nov 5.
Where Humen stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Humen: Critically low
13.1% tree cover against a 30% healthy-neighborhood target, across 12.02 km² of land.
Trees in this area
39,344
Target trees
90,101
More trees needed
50,757
CO₂ if planted / yr
1,117 t
Deforestation · 2001–2025
How much forest has Humen lost?
Since 2001, the area within 10 km of Humen has lost about 132 hectares of forest (about 180 football pitches): 9.6% of the forest it had in 2000. The biggest cause was towns and roads (47%). About 63 hectares (47%) was deforestation: forest cleared for good for farms, mines or towns.
2018: satellite photo from November 2017 of a 5 × 5 km area about 7 km north of the city center.
- Forest lost since 2001
- 132 haabout 180 football pitches
- Share of its forest
- 9.6%of what there was in 2000
- Cleared for good
- 63 hadeforestation: turned into farms, mines or towns
The worst year was 2024, when about 28 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 | 3 ha | 2 ha | 5 ha |
| 2002 | under 1 ha | under 1 ha | 1 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | under 1 ha | 1 ha | 2 ha |
| 2005 | 2 ha | 1 ha | 3 ha |
| 2006 | under 1 ha | 1 ha | 1 ha |
| 2007 | 3 ha | 2 ha | 5 ha |
| 2008 | 1 ha | under 1 ha | 1 ha |
| 2009 | 2 ha | under 1 ha | 2 ha |
| 2010 | 5 ha | 1 ha | 6 ha |
| 2011 | 2 ha | 1 ha | 3 ha |
| 2012 | 3 ha | 3 ha | 5 ha |
| 2013 | 4 ha | under 1 ha | 4 ha |
| 2014 | under 1 ha | under 1 ha | under 1 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | 1 ha | under 1 ha | 1 ha |
| 2017 | 2 ha | under 1 ha | 3 ha |
| 2018 | 4 ha | 8 ha | 13 ha |
| 2019 | under 1 ha | under 1 ha | 1 ha |
| 2020 | under 1 ha | under 1 ha | under 1 ha |
| 2021 | under 1 ha | under 1 ha | under 1 ha |
| 2022 | under 1 ha | 7 ha | 8 ha |
| 2023 | 8 ha | 6 ha | 14 ha |
| 2024 | 8 ha | 20 ha | 28 ha |
| 2025 | 12 ha | 12 ha | 23 ha |
What is causing deforestation around Humen?
- Towns and roadscleared for good47% · 63 ha
- Loggingcan grow back47% · 62 ha
- Storms, floods and other natural causescan grow back1.1% · 1 ha
Also: 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
- 3,740 ha
- Forest in 2020
- 4,240 ha
- Overall change
- +498 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Humen grew from about 3,740 hectares to 4,240 hectares, a net gain of about 498 hectares (+13%). New forest grew on about 577 hectares, while 78 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 Humen
What is the air quality (AQI) in Humen right now?
The latest reading for Humen shows an AQI of 91 (Moderate), measured Nov 11, 22:00 local time by 2 ground monitoring stations via OpenAQ (the median of their readings; the nearest is 虎门港, (东莞市虎门港), 5.2 km away). The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Humen today?
At AQI 91 (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 Humen been like this week?
Over the last 7 days, the CAMS air-quality model put Humen's daily AQI at 83 on average, from 54 on Nov 9 to an hourly peak of 177 on Nov 5. On 2 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Humen lost since 2001?
Since 2001, the area within 10 km of Humen has lost about 132 hectares of forest (about 180 football pitches): 9.6% of the forest it had in 2000. The biggest cause was towns and roads (47%). About 63 hectares (47%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Humen grew from about 3,740 hectares to 4,240 hectares, a net gain of about 498 hectares (+13%). New forest grew on about 577 hectares, while 78 hectares were lost.
What is the tree count in Humen?
Humen has an estimated 39,344 trees across the 12.02 km² of land measured — 13.1% tree cover, 17 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Humen need?
Humen needs roughly 50,757 more trees to close a 17-point shortfall against its 30% tree-cover target — about 1,117 t of extra CO₂ absorbed per year once grown.
How are Humen's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Dongguan, 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 Dongguan; the tree count is an estimate derived from that cover.
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