City report · Hainan, China
Haikou Air quality today
Air quality in Haikou currently reads AQI 73 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 73
Moderate
- PM2.5, fine particles (µg/m³)
- 20.9
- tree cover
- 23.4%
- trees in this area
- 71.6K
- more trees needed
- 20.2K
Measured across a 2 km radius around Longhua District, Haikou, Haikou, Hainan, China (12.57 km²), from a satellite image of Sep 8, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Haikou · AQI 73 (Moderate)
Haikou's tree count comes to 71,602 trees across 12.24 km² of land, 7 points below the 30% tree-cover level considered healthy for this area, so roughly 20,195 more trees would close the gap.
Air quality detail
Air quality in Haikou today: AQI 73, 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 · Longhua road EPA dormitory, Haikou (海口龙华路环保局宿舍), 1.7 km away · median of 2 stations
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
20.9
PM10
31.3
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 Haikou's daily AQI at 55 on average, from 41 on Nov 8 to an hourly peak of 78 on Nov 10.
Where Haikou stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Haikou: Below target
23.4% tree cover against a 30% healthy-neighborhood target, across 12.24 km² of land.
Trees in this area
71,602
Target trees
91,797
More trees needed
20,195
CO₂ if planted / yr
444.3 t
Deforestation · 2001–2025
How much forest has Haikou lost?
Since 2001, the area within 10 km of Haikou has lost about 159 hectares of forest (about 220 football pitches): 16% of the forest it had in 2000. Most of it (94%) was deforestation, forest cleared for good, mainly for towns and roads.
2018: satellite photo from December 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 159 haabout 220 football pitches
- Share of its forest
- 16%of what there was in 2000
- Cleared for good
- 150 hadeforestation: turned into farms, mines or towns
The worst year was 2009, when about 40 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 | under 1 ha | 3 ha |
| 2002 | under 1 ha | under 1 ha | under 1 ha |
| 2003 | 3 ha | under 1 ha | 4 ha |
| 2004 | 8 ha | under 1 ha | 8 ha |
| 2005 | 4 ha | under 1 ha | 5 ha |
| 2006 | 8 ha | under 1 ha | 8 ha |
| 2007 | 9 ha | under 1 ha | 9 ha |
| 2008 | 3 ha | under 1 ha | 4 ha |
| 2009 | 39 ha | 2 ha | 40 ha |
| 2010 | 7 ha | 1 ha | 8 ha |
| 2011 | 33 ha | 2 ha | 34 ha |
| 2012 | 16 ha | under 1 ha | 16 ha |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | under 1 ha | under 1 ha | under 1 ha |
| 2015 | 1 ha | under 1 ha | 1 ha |
| 2016 | under 1 ha | under 1 ha | under 1 ha |
| 2017 | 3 ha | under 1 ha | 3 ha |
| 2018 | under 1 ha | under 1 ha | 1 ha |
| 2019 | under 1 ha | under 1 ha | under 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 | under 1 ha | under 1 ha |
| 2023 | under 1 ha | under 1 ha | under 1 ha |
| 2024 | 5 ha | under 1 ha | 6 ha |
| 2025 | 3 ha | under 1 ha | 4 ha |
What is causing deforestation around Haikou?
- Towns and roadscleared for good92% · 147 ha
- Farms, pasture and plantationscleared for good1.6% · 3 ha
- Unknown causescause unknown4.8% · 8 ha
Also: logging.
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
- 2,250 ha
- Forest in 2020
- 2,310 ha
- Overall change
- +64 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Haikou grew from about 2,250 hectares to 2,310 hectares, a net gain of about 64 hectares (+2.9%). New forest grew on about 378 hectares, while 314 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 Haikou
What is the air quality (AQI) in Haikou right now?
The latest reading for Haikou shows an AQI of 73 (Moderate), measured Nov 11, 23:00 local time by 2 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Longhua road EPA dormitory, Haikou (海口龙华路环保局宿舍), 1.7 km away). The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Haikou today?
At AQI 73 (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 Haikou been like this week?
Over the last 7 days, the CAMS air-quality model put Haikou's daily AQI at 55 on average, from 41 on Nov 8 to an hourly peak of 78 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 Haikou lost since 2001?
Since 2001, the area within 10 km of Haikou has lost about 159 hectares of forest (about 220 football pitches): 16% of the forest it had in 2000. Most of it (94%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Haikou grew from about 2,250 hectares to 2,310 hectares, a net gain of about 64 hectares (+2.9%). New forest grew on about 378 hectares, while 314 hectares were lost.
What is the tree count in Haikou?
Haikou has an estimated 71,602 trees across the 12.24 km² of land measured — 23.4% tree cover, 7 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Haikou need?
Haikou needs roughly 20,195 more trees to close a 7-point shortfall against its 30% tree-cover target — about 444.3 t of extra CO₂ absorbed per year once grown.
How are Haikou's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Longhua 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 Longhua District; the tree count is an estimate derived from that cover.
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