City report · Shaanxi, China
Chenggu Air quality today
Air quality in Chenggu currently reads AQI 122 (Unhealthy for sensitive groups): Sensitive groups should limit long or intense outdoor activity.
AQI 122
Air quality right now
Unhealthy for sensitive groups
- PM2.5, fine particles (µg/m³)
- 44.0
- tree cover
- 12.3%
- trees in this area
- 38.2K
- more trees needed
- 70.5K
Measured across a 2 km radius around Chenggu County, Hanzhong, Shaanxi, China (12.57 km²), from a satellite image of Sep 4, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Chenggu · AQI 122 (Unhealthy for sensitive groups)
Chenggu's tree count comes to 38,178 trees across 12.42 km² of land, 23 points below the 35% tree-cover level considered healthy for this area, so roughly 70,458 more trees would close the gap.
Air quality detail
Air quality in Chenggu today: AQI 122, 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 · Chenggu County Government, Hanzhong (汉中城固县政府), 1.2 km away
Health signal
Sensitive groups should limit long or intense outdoor activity.
PM2.5
44.0
PM10
65.1
NO₂
—
O₃
—
SO₂
—
CO
—
Data: World Air Quality Index Project, Shaanxi Provincial Environmental Protection Office (陕西省环保厅)
- 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 Chenggu's daily AQI at 81 on average, from 70 on Nov 7 to an hourly peak of 136 on Nov 5.
Where Chenggu stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Chenggu: Critically low
12.3% tree cover against a 35% healthy-neighborhood target, across 12.42 km² of land.
Trees in this area
38,178
Target trees
108,636
More trees needed
70,458
CO₂ if planted / yr
1,550 t
Deforestation · 2001–2025
How much forest has Chenggu lost?
Since 2001, the area within 10 km of Chenggu has lost about 39 hectares of forest (about 55 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 12 hectares (30%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from July 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 39 haabout 55 football pitches
- Share of its forest
- 2.4%of what there was in 2000
- Cleared for good
- 12 hadeforestation: turned into farms, mines or towns
The worst year was 2020, when about 15 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 | under 1 ha | under 1 ha | under 1 ha |
| 2007 | under 1 ha | under 1 ha | under 1 ha |
| 2008 | under 1 ha | under 1 ha | under 1 ha |
| 2009 | under 1 ha | under 1 ha | under 1 ha |
| 2010 | under 1 ha | under 1 ha | under 1 ha |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | under 1 ha | under 1 ha | under 1 ha |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | under 1 ha | under 1 ha | under 1 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | under 1 ha | under 1 ha | 1 ha |
| 2017 | under 1 ha | under 1 ha | 1 ha |
| 2018 | under 1 ha | 3 ha | 3 ha |
| 2019 | 1 ha | 3 ha | 4 ha |
| 2020 | 4 ha | 10 ha | 15 ha |
| 2021 | under 1 ha | under 1 ha | 1 ha |
| 2022 | 2 ha | 4 ha | 6 ha |
| 2023 | 1 ha | under 1 ha | 1 ha |
| 2024 | under 1 ha | under 1 ha | under 1 ha |
| 2025 | under 1 ha | 3 ha | 3 ha |
What is causing deforestation around Chenggu?
- Loggingcan grow back61% · 24 ha
- Towns and roadscleared for good28% · 11 ha
- Farms, pasture and plantationscleared for good1.3% · under 1 ha
Also: 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
- 5,890 ha
- Forest in 2020
- 6,550 ha
- Overall change
- +662 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Chenggu grew from about 5,890 hectares to 6,550 hectares, a net gain of about 662 hectares (+11%). New forest grew on about 680 hectares, while 19 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 Chenggu
What is the air quality (AQI) in Chenggu right now?
The latest reading for Chenggu shows an AQI of 122 (Unhealthy for sensitive groups), measured Nov 11, 23:00 local time by the Chenggu County Government, Hanzhong (汉中城固县政府) 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 Chenggu today?
At AQI 122 (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 Chenggu been like this week?
Over the last 7 days, the CAMS air-quality model put Chenggu's daily AQI at 81 on average, from 70 on Nov 7 to an hourly peak of 136 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 Chenggu lost since 2001?
Since 2001, the area within 10 km of Chenggu has lost about 39 hectares of forest (about 55 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 12 hectares (30%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Chenggu grew from about 5,890 hectares to 6,550 hectares, a net gain of about 662 hectares (+11%). New forest grew on about 680 hectares, while 19 hectares were lost.
What is the tree count in Chenggu?
Chenggu has an estimated 38,178 trees across the 12.42 km² of land measured — 12.3% tree cover, 23 percentage points short of the 35% tree-cover target set for this area.
How many more trees does Chenggu need?
Chenggu needs roughly 70,458 more trees to close a 23-point shortfall against its 35% tree-cover target — about 1,550 t of extra CO₂ absorbed per year once grown.
How are Chenggu's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Chenggu County, 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 Chenggu County; the tree count is an estimate derived from that cover.
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