City report · Zhejiang, China
Rui’an Air quality today
Air quality in Rui’an currently reads AQI 123 (Unhealthy for sensitive groups): Sensitive groups should limit long or intense outdoor activity.
AQI 123
Air quality right now
Unhealthy for sensitive groups
- PM2.5, fine particles (µg/m³)
- 44.5
- tree cover
- 14.6%
- trees in this area
- 45.6K
- more trees needed
- 63.7K
Measured across a 2 km radius around Ruian, Wenzhou, Zhejiang, China (12.57 km²), from a satellite image of Sep 26, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Rui’an · AQI 123 (Unhealthy for sensitive groups)
Rui’an's tree count comes to 45,592 trees across 12.49 km² of land, 20 points below the 35% tree-cover level considered healthy for this area, so roughly 63,704 more trees would close the gap.
Air quality detail
Air quality in Rui’an today: AQI 123, Unhealthy for sensitive groups
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 · Longwan, Wenzhou (温州市龙湾), 24.1 km away · median of 2 stations
Health signal
Sensitive groups should limit long or intense outdoor activity.
PM2.5
44.5
PM10
98.4
NO₂
—
O₃
—
SO₂
—
CO
—
Data: World Air Quality Index Project, Zhejiang Environmental Protection Bureau (浙江省环保厅门户)
- Outdoor exercise
- Children, older adults and people with asthma or heart disease should cut down long or hard exercise
- Windows
- Close them to keep the outside air out
- Mask
- Sensitive groups: an N95 outdoors
- Air purifier
- Run one, especially in bedrooms
Over the last 7 days, the CAMS air-quality model put Rui’an's daily AQI at 68 on average, from 46 on Nov 9 to an hourly peak of 118 on Nov 5.
Where Rui’an stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Rui’an: Critically low
14.6% tree cover against a 35% healthy-neighborhood target, across 12.49 km² of land.
Trees in this area
45,592
Target trees
109,296
More trees needed
63,704
CO₂ if planted / yr
1,401 t
Deforestation · 2001–2025
How much forest has Rui’an lost?
Since 2001, the area within 10 km of Rui’an has lost about 46 hectares of forest (about 65 football pitches): 4% of the forest it had in 2000. Most of it (91%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from December 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 46 haabout 65 football pitches
- Share of its forest
- 4%of what there was in 2000
- Cleared for good
- 42 hadeforestation: turned into farms, mines or towns
The worst year was 2007, when about 6 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 | under 1 ha | under 1 ha | under 1 ha |
| 2002 | under 1 ha | under 1 ha | under 1 ha |
| 2003 | 1 ha | under 1 ha | 2 ha |
| 2004 | 2 ha | under 1 ha | 2 ha |
| 2005 | 1 ha | under 1 ha | 1 ha |
| 2006 | 4 ha | under 1 ha | 4 ha |
| 2007 | 5 ha | under 1 ha | 6 ha |
| 2008 | 4 ha | under 1 ha | 4 ha |
| 2009 | under 1 ha | under 1 ha | under 1 ha |
| 2010 | 4 ha | under 1 ha | 4 ha |
| 2011 | 4 ha | under 1 ha | 4 ha |
| 2012 | under 1 ha | under 1 ha | under 1 ha |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | 2 ha | under 1 ha | 2 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | 3 ha | under 1 ha | 3 ha |
| 2017 | 2 ha | under 1 ha | 2 ha |
| 2018 | under 1 ha | under 1 ha | under 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 | 2 ha | under 1 ha | 2 ha |
| 2023 | 2 ha | under 1 ha | 2 ha |
| 2024 | 1 ha | under 1 ha | 1 ha |
| 2025 | 4 ha | 1 ha | 5 ha |
What is causing deforestation around Rui’an?
- Towns and roadscleared for good90% · 41 ha
- Mining and energycleared for good1.1% · under 1 ha
- Unknown causescause unknown9.5% · 4 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
- 3,340 ha
- Forest in 2020
- 3,560 ha
- Overall change
- +220 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Rui’an grew from about 3,340 hectares to 3,560 hectares, a net gain of about 220 hectares (+6.6%). New forest grew on about 269 hectares, while 50 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 Rui’an
What is the air quality (AQI) in Rui’an right now?
The latest reading for Rui’an shows an AQI of 123 (Unhealthy for sensitive groups), measured Nov 11, 23:00 local time by 2 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Longwan, Wenzhou (温州市龙湾), 24.1 km away). The main pollutant is PM2.5. Sensitive groups should limit long or intense outdoor activity.
Is it safe to exercise outside in Rui’an today?
At AQI 123 (Unhealthy for sensitive groups): children, older adults and people with asthma or heart disease should cut down long or hard exercise. Windows: close them to keep the outside air out. Masks: sensitive groups: an N95 outdoors. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Rui’an been like this week?
Over the last 7 days, the CAMS air-quality model put Rui’an's daily AQI at 68 on average, from 46 on Nov 9 to an hourly peak of 118 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 Rui’an lost since 2001?
Since 2001, the area within 10 km of Rui’an has lost about 46 hectares of forest (about 65 football pitches): 4% of the forest it had in 2000. Most of it (91%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Rui’an grew from about 3,340 hectares to 3,560 hectares, a net gain of about 220 hectares (+6.6%). New forest grew on about 269 hectares, while 50 hectares were lost.
What is the tree count in Rui’an?
Rui’an has an estimated 45,592 trees across the 12.49 km² of land measured — 14.6% tree cover, 20 percentage points short of the 35% tree-cover target set for this area.
How many more trees does Rui’an need?
Rui’an needs roughly 63,704 more trees to close a 20-point shortfall against its 35% tree-cover target — about 1,401 t of extra CO₂ absorbed per year once grown.
How are Rui’an's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Ruian, 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 Ruian; the tree count is an estimate derived from that cover.
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