City report · Yunnan, China
Mengzi Air quality today
Air quality in Mengzi currently reads AQI 104 (Unhealthy for sensitive groups): Sensitive groups should limit long or intense outdoor activity.
Air quality right now
AQI 104
Unhealthy for sensitive groups
- PM2.5, fine particles (µg/m³)
- 36.7
- tree cover
- 23.5%
- trees in this area
- 72.9K
- more trees needed
- 35.7K
Measured across a 2 km radius around Mengzi, Honghe Hani and Yi Autonomous Prefecture, Yunnan, China (12.57 km²), from a satellite image of Sep 22, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Mengzi · AQI 104 (Unhealthy for sensitive groups)
Mengzi's tree count comes to 72,941 trees across 12.42 km² of land, 12 points below the 35% tree-cover level considered healthy for this area, so roughly 35,695 more trees would close the gap.
Air quality detail
Air quality in Mengzi today: AQI 104, Unhealthy for sensitive groups
Main pollutant: PM2.5 · Observed Nov 11, 21:00 local time via World Air Quality Index Project ground stations, US EPA index. Values in µg/m³.
Ground station · 州图书馆, Honghe (红河州州图书馆), 600 m away
Health signal
Sensitive groups should limit long or intense outdoor activity.
PM2.5
36.7
PM10
42.1
NO₂
—
O₃
—
SO₂
—
CO
—
Data: World Air Quality Index Project
- 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 Mengzi's daily AQI at 33 on average, from 14 on Nov 9 to an hourly peak of 75 on Nov 5.
Where Mengzi stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Mengzi: Below target
23.5% tree cover against a 35% healthy-neighborhood target, across 12.42 km² of land.
Trees in this area
72,941
Target trees
108,636
More trees needed
35,695
CO₂ if planted / yr
785.3 t
Deforestation · 2001–2025
How much forest has Mengzi lost?
Since 2001, the area within 10 km of Mengzi has lost about 40 hectares of forest (about 56 football pitches): 8.3% of the forest it had in 2000. Most of it (74%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations.
2017: satellite photo from March 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 40 haabout 56 football pitches
- Share of its forest
- 8.3%of what there was in 2000
- Cleared for good
- 30 hadeforestation: turned into farms, mines or towns
The worst year was 2007, when about 8 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 | 1 ha | 2 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | under 1 ha | under 1 ha | under 1 ha |
| 2005 | under 1 ha | under 1 ha | under 1 ha |
| 2006 | 4 ha | under 1 ha | 4 ha |
| 2007 | 4 ha | 4 ha | 8 ha |
| 2008 | 2 ha | under 1 ha | 3 ha |
| 2009 | 1 ha | 1 ha | 2 ha |
| 2010 | under 1 ha | under 1 ha | 1 ha |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | 6 ha | under 1 ha | 6 ha |
| 2013 | under 1 ha | under 1 ha | 1 ha |
| 2014 | 2 ha | under 1 ha | 2 ha |
| 2015 | under 1 ha | under 1 ha | 1 ha |
| 2016 | 1 ha | under 1 ha | 1 ha |
| 2017 | under 1 ha | under 1 ha | under 1 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 | under 1 ha | under 1 ha | under 1 ha |
| 2023 | under 1 ha | under 1 ha | under 1 ha |
| 2024 | 3 ha | under 1 ha | 3 ha |
| 2025 | 2 ha | under 1 ha | 2 ha |
What is causing deforestation around Mengzi?
- Farms, pasture and plantationscleared for good42% · 17 ha
- Towns and roadscleared for good26% · 11 ha
- Loggingcan grow back19% · 8 ha
Also: mining and energy, 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
- 2,630 ha
- Forest in 2020
- 5,700 ha
- Overall change
- +3,080 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Mengzi grew from about 2,630 hectares to 5,700 hectares, a net gain of about 3,080 hectares (+117%). New forest grew on about 3,230 hectares, while 154 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 Mengzi
What is the air quality (AQI) in Mengzi right now?
The latest reading for Mengzi shows an AQI of 104 (Unhealthy for sensitive groups), measured Nov 11, 21:00 local time by the 州图书馆, Honghe (红河州州图书馆) ground monitoring station, 600 m away, via OpenAQ. The main pollutant is PM2.5. Sensitive groups should limit long or intense outdoor activity.
Is it safe to exercise outside in Mengzi today?
At AQI 104 (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 Mengzi been like this week?
Over the last 7 days, the CAMS air-quality model put Mengzi's daily AQI at 33 on average, from 14 on Nov 9 to an hourly peak of 75 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 Mengzi lost since 2001?
Since 2001, the area within 10 km of Mengzi has lost about 40 hectares of forest (about 56 football pitches): 8.3% of the forest it had in 2000. Most of it (74%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations. Comparing satellite maps from 2000 and 2020, the forest around Mengzi grew from about 2,630 hectares to 5,700 hectares, a net gain of about 3,080 hectares (+117%). New forest grew on about 3,230 hectares, while 154 hectares were lost.
What is the tree count in Mengzi?
Mengzi has an estimated 72,941 trees across the 12.42 km² of land measured — 23.5% tree cover, 12 percentage points short of the 35% tree-cover target set for this area.
How many more trees does Mengzi need?
Mengzi needs roughly 35,695 more trees to close a 12-point shortfall against its 35% tree-cover target — about 785.3 t of extra CO₂ absorbed per year once grown.
How are Mengzi's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Mengzi, 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 Mengzi; the tree count is an estimate derived from that cover.
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