City report · Hainan, China
Nada Air quality today
Air quality in Nada currently reads AQI 77 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 77
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 23.0
- tree cover
- 28.0%
- trees in this area
- 88.0K
- more trees needed
- 6.3K
Measured across a 2 km radius around Danzhou, Hainan, China (12.57 km²), from a satellite image of Jun 22, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Nada · AQI 77 (Moderate)
Nada's tree count comes to 87,965 trees across 12.57 km², 2 points below the 30% tree-cover level considered healthy for this area, so roughly 6,283 more trees would close the gap.
Air quality detail
Air quality in Nada today: AQI 77, Moderate
Main pollutant: PM2.5 · Observed Nov 12, 01:00 local time via World Air Quality Index Project ground stations, US EPA index. Values in µg/m³.
Ground station · Danzhou (儋州), 200 m away · median of 2 stations
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
23.0
PM10
38.9
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 Nada's daily AQI at 50 on average, from 35 on Nov 8 to an hourly peak of 74 on Nov 10.
Where Nada stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Nada: Below target
28.0% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
87,965
Target trees
94,248
More trees needed
6,283
CO₂ if planted / yr
138.2 t
Deforestation · 2001–2025
How much forest has Nada lost?
Since 2001, the area within 10 km of Nada has lost about 5,050 hectares of forest (about 7,100 football pitches): 30% of the forest it had in 2000. Most of it (94%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations.
2017: satellite photo from April 2017 of a 5 × 5 km area about 7 km west of the city center.
- Forest lost since 2001
- 5,050 haabout 7,100 football pitches
- Share of its forest
- 30%of what there was in 2000
- Cleared for good
- 4,760 hadeforestation: turned into farms, mines or towns
Forest loss is slowing down: about 220 hectares a year in 2021–2025, down from 299 hectares a year in 2016–2020. The worst year was 2016, when about 523 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 | 167 ha | 5 ha | 172 ha |
| 2002 | 72 ha | under 1 ha | 73 ha |
| 2003 | 100 ha | 3 ha | 103 ha |
| 2004 | 244 ha | 31 ha | 275 ha |
| 2005 | 119 ha | 14 ha | 133 ha |
| 2006 | 126 ha | 7 ha | 133 ha |
| 2007 | 101 ha | 5 ha | 106 ha |
| 2008 | 147 ha | 9 ha | 156 ha |
| 2009 | 133 ha | 13 ha | 146 ha |
| 2010 | 191 ha | 17 ha | 208 ha |
| 2011 | 425 ha | 37 ha | 462 ha |
| 2012 | 165 ha | 8 ha | 173 ha |
| 2013 | 62 ha | 1 ha | 63 ha |
| 2014 | 96 ha | 1 ha | 97 ha |
| 2015 | 142 ha | 11 ha | 153 ha |
| 2016 | 510 ha | 13 ha | 523 ha |
| 2017 | 359 ha | 22 ha | 381 ha |
| 2018 | 274 ha | 10 ha | 284 ha |
| 2019 | 165 ha | 1 ha | 166 ha |
| 2020 | 127 ha | 14 ha | 141 ha |
| 2021 | 192 ha | 25 ha | 217 ha |
| 2022 | 119 ha | 5 ha | 124 ha |
| 2023 | 118 ha | 15 ha | 133 ha |
| 2024 | 244 ha | 4 ha | 248 ha |
| 2025 | 361 ha | 15 ha | 376 ha |
What is causing deforestation around Nada?
- Farms, pasture and plantationscleared for good83% · 4,200 ha
- Towns and roadscleared for good11% · 559 ha
- Loggingcan grow back5.7% · 288 ha
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
- 23,000 ha
- Forest in 2020
- 23,600 ha
- Overall change
- +638 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Nada grew from about 23,000 hectares to 23,600 hectares, a net gain of about 638 hectares (+2.8%). New forest grew on about 2,110 hectares, while 1,470 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 Nada
What is the air quality (AQI) in Nada right now?
The latest reading for Nada shows an AQI of 77 (Moderate), measured Nov 12, 01:00 local time by 2 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Danzhou (儋州), 200 m away). The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Nada today?
At AQI 77 (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 Nada been like this week?
Over the last 7 days, the CAMS air-quality model put Nada's daily AQI at 50 on average, from 35 on Nov 8 to an hourly peak of 74 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 Nada lost since 2001?
Since 2001, the area within 10 km of Nada has lost about 5,050 hectares of forest (about 7,100 football pitches): 30% of the forest it had in 2000. Most of it (94%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations. Forest loss is slowing down: about 220 hectares a year in 2021–2025, down from 299 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Nada grew from about 23,000 hectares to 23,600 hectares, a net gain of about 638 hectares (+2.8%). New forest grew on about 2,110 hectares, while 1,470 hectares were lost.
What is the tree count in Nada?
Nada has an estimated 87,965 trees across the 12.57 km² measured — 28.0% tree cover, 2 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Nada need?
Nada needs roughly 6,283 more trees to close a 2-point shortfall against its 30% tree-cover target — about 138.2 t of extra CO₂ absorbed per year once grown.
How are Nada's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Danzhou, 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 Danzhou; the tree count is an estimate derived from that cover.
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