City report · Hainan, China
Wenchang Air quality today
Air quality in Wenchang currently reads AQI 99 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 99
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 34.9
- tree cover
- 64.9%
- trees in this area
- 203K
- more trees needed
- 0
Measured across a 2 km radius around Wenchang, Hainan, China (12.57 km²), from a satellite image of Aug 9, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Wenchang · AQI 99 (Moderate)
Wenchang's tree count comes to 203,278 trees across 12.53 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Wenchang today: AQI 99, 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 · Wenchang, 1.1 km away · median of 2 stations
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
34.9
PM10
32.4
NO₂
—
O₃
—
SO₂
—
CO
—
Data: World Air Quality Index Project, Hainan Environmental Protection Agency (海南省国土环境资源厅)
- 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 Wenchang's daily AQI at 54 on average, from 43 on Nov 8 to an hourly peak of 81 on Nov 10.
Where Wenchang stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Wenchang: Healthy tree cover
64.9% tree cover against a 30% healthy-neighborhood target, across 12.53 km² of land.
Trees in this area
203,278
Target trees
203,278
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Wenchang lost?
Since 2001, the area within 10 km of Wenchang has lost about 1,990 hectares of forest (about 2,800 football pitches): 21% of the forest it had in 2000. Most of it (64%) was deforestation, forest cleared for good, mainly for towns and roads.
2019: satellite photo from May 2019 of a 5 × 5 km area about 5 km northwest of the city center.
- Forest lost since 2001
- 1,990 haabout 2,800 football pitches
- Share of its forest
- 21%of what there was in 2000
- Cleared for good
- 1,280 hadeforestation: turned into farms, mines or towns
Forest loss has stayed about the same: about 116 hectares a year in 2021–2025, against 107 hectares a year in 2016–2020. The worst year was 2010, when about 237 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 | 7 ha | 11 ha | 18 ha |
| 2002 | 13 ha | 18 ha | 30 ha |
| 2003 | 12 ha | 10 ha | 22 ha |
| 2004 | 30 ha | 20 ha | 50 ha |
| 2005 | 16 ha | 14 ha | 30 ha |
| 2006 | 33 ha | 24 ha | 56 ha |
| 2007 | 38 ha | 43 ha | 81 ha |
| 2008 | 18 ha | 13 ha | 30 ha |
| 2009 | under 1 ha | under 1 ha | under 1 ha |
| 2010 | 169 ha | 68 ha | 237 ha |
| 2011 | 47 ha | 12 ha | 59 ha |
| 2012 | 141 ha | 37 ha | 178 ha |
| 2013 | 10 ha | 4 ha | 14 ha |
| 2014 | 28 ha | 13 ha | 40 ha |
| 2015 | 17 ha | 14 ha | 30 ha |
| 2016 | 48 ha | 36 ha | 84 ha |
| 2017 | 142 ha | 91 ha | 233 ha |
| 2018 | 87 ha | 45 ha | 132 ha |
| 2019 | 11 ha | 14 ha | 24 ha |
| 2020 | 43 ha | 21 ha | 64 ha |
| 2021 | 46 ha | 36 ha | 82 ha |
| 2022 | 79 ha | 25 ha | 104 ha |
| 2023 | 43 ha | 26 ha | 69 ha |
| 2024 | 117 ha | 48 ha | 165 ha |
| 2025 | 85 ha | 74 ha | 159 ha |
What is causing deforestation around Wenchang?
- Towns and roadscleared for good48% · 960 ha
- Loggingcan grow back35% · 697 ha
- Farms, pasture and plantationscleared for good16% · 317 ha
Also: storms, floods and other natural causes, 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
- 13,000 ha
- Forest in 2020
- 12,400 ha
- Overall change
- −613 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Wenchang shrank from about 13,000 hectares to 12,400 hectares, a net loss of about 613 hectares (−4.7%). New forest grew on about 432 hectares, but 1,050 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 Wenchang
What is the air quality (AQI) in Wenchang right now?
The latest reading for Wenchang shows an AQI of 99 (Moderate), measured Nov 11, 22:00 local time by 2 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Wenchang, 1.1 km away). The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Wenchang today?
At AQI 99 (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 Wenchang been like this week?
Over the last 7 days, the CAMS air-quality model put Wenchang's daily AQI at 54 on average, from 43 on Nov 8 to an hourly peak of 81 on Nov 10. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Wenchang lost since 2001?
Since 2001, the area within 10 km of Wenchang has lost about 1,990 hectares of forest (about 2,800 football pitches): 21% of the forest it had in 2000. Most of it (64%) was deforestation, forest cleared for good, mainly for towns and roads. Forest loss has stayed about the same: about 116 hectares a year in 2021–2025, against 107 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Wenchang shrank from about 13,000 hectares to 12,400 hectares, a net loss of about 613 hectares (−4.7%). New forest grew on about 432 hectares, but 1,050 hectares were lost.
What is the tree count in Wenchang?
Wenchang has an estimated 203,278 trees across the 12.53 km² of land measured — 64.9% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Wenchang need?
Wenchang has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Wenchang's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Wenchang, 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 Wenchang; the tree count is an estimate derived from that cover.
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