City report · Sichuan, China
Ya'an Air quality today
Air quality in Ya'an currently reads AQI 124 (Unhealthy for sensitive groups): Sensitive groups should limit long or intense outdoor activity.
Air quality right now
AQI 124
Unhealthy for sensitive groups
- PM2.5, fine particles (µg/m³)
- 44.8
- tree cover
- 46.3%
- trees in this area
- 136K
- more trees needed
- 0
Measured across a 2 km radius around Yucheng District, Yaan, Sichuan, China (12.57 km²), from a satellite image of Sep 5, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Ya'an · AQI 124 (Unhealthy for sensitive groups)
Ya'an's tree count comes to 136,437 trees across 11.79 km² of land, already at or above the 35% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Ya'an today: AQI 124, 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 · City government, Yaan (雅安市政府), 1.2 km away
Health signal
Sensitive groups should limit long or intense outdoor activity.
PM2.5
44.8
PM10
55.0
NO₂
—
O₃
—
SO₂
—
CO
—
Data: World Air Quality Index Project, Sichuan Province Environmental Protection Agency (四川省环保重点城市环境空气质量实时监测结果)
- 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 Ya'an's daily AQI at 78 on average, from 58 on Nov 8 to an hourly peak of 137 on Nov 6.
Where Ya'an stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Ya'an: Healthy tree cover
46.3% tree cover against a 35% healthy-neighborhood target, across 11.79 km² of land.
Trees in this area
136,437
Target trees
136,437
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Ya'an lost?
Since 2001, the area within 10 km of Ya'an has lost about 524 hectares of forest (about 730 football pitches): 2.4% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 111 hectares (21%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from July 2017 of a 5 × 5 km area about 6 km northwest of the city center.
- Forest lost since 2001
- 524 haabout 730 football pitches
- Share of its forest
- 2.4%of what there was in 2000
- Cleared for good
- 111 hadeforestation: turned into farms, mines or towns
The worst year was 2024, when about 51 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 | 2 ha | 2 ha |
| 2002 | 7 ha | 5 ha | 11 ha |
| 2003 | 2 ha | 2 ha | 4 ha |
| 2004 | under 1 ha | under 1 ha | under 1 ha |
| 2005 | 1 ha | 10 ha | 11 ha |
| 2006 | 4 ha | 31 ha | 34 ha |
| 2007 | 1 ha | 17 ha | 18 ha |
| 2008 | under 1 ha | 4 ha | 5 ha |
| 2009 | 2 ha | 21 ha | 23 ha |
| 2010 | under 1 ha | 22 ha | 23 ha |
| 2011 | 2 ha | 46 ha | 48 ha |
| 2012 | under 1 ha | 34 ha | 34 ha |
| 2013 | under 1 ha | 32 ha | 32 ha |
| 2014 | under 1 ha | 19 ha | 20 ha |
| 2015 | 5 ha | 7 ha | 13 ha |
| 2016 | 10 ha | 3 ha | 12 ha |
| 2017 | 3 ha | 9 ha | 12 ha |
| 2018 | under 1 ha | 3 ha | 3 ha |
| 2019 | 5 ha | 18 ha | 22 ha |
| 2020 | 6 ha | 12 ha | 18 ha |
| 2021 | 5 ha | 24 ha | 29 ha |
| 2022 | 8 ha | 21 ha | 29 ha |
| 2023 | 7 ha | 20 ha | 26 ha |
| 2024 | 33 ha | 18 ha | 51 ha |
| 2025 | 10 ha | 34 ha | 44 ha |
What is causing deforestation around Ya'an?
- Loggingcan grow back73% · 384 ha
- Towns and roadscleared for good19% · 102 ha
- Farms, pasture and plantationscleared for good1.6% · 8 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
- 26,900 ha
- Forest in 2020
- 27,100 ha
- Overall change
- +191 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Ya'an stayed about the same size, at about 27,100 hectares: new forest grew on about 386 hectares, and about 195 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 Ya'an
What is the air quality (AQI) in Ya'an right now?
The latest reading for Ya'an shows an AQI of 124 (Unhealthy for sensitive groups), measured Nov 11, 23:00 local time by the City government, Yaan (雅安市政府) ground monitoring station, 1.2 km 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 Ya'an today?
At AQI 124 (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 Ya'an been like this week?
Over the last 7 days, the CAMS air-quality model put Ya'an's daily AQI at 78 on average, from 58 on Nov 8 to an hourly peak of 137 on Nov 6. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Ya'an lost since 2001?
Since 2001, the area within 10 km of Ya'an has lost about 524 hectares of forest (about 730 football pitches): 2.4% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 111 hectares (21%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Ya'an stayed about the same size, at about 27,100 hectares: new forest grew on about 386 hectares, and about 195 hectares were lost.
What is the tree count in Ya'an?
Ya'an has an estimated 136,437 trees across the 11.79 km² of land measured — 46.3% tree cover, already past the 35% tree-cover target set for this area.
How many more trees does Ya'an need?
Ya'an has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Ya'an's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Yucheng 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 Yucheng District; the tree count is an estimate derived from that cover.
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