City report · Gansu, China
Gangu Chengguanzhen Air quality today
Air quality in Gangu Chengguanzhen currently reads AQI 62 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 62
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 18.4
- tree cover
- 14.9%
- trees in this area
- 46.8K
- more trees needed
- 47.4K
Measured across a 2 km radius around Gangu County, Tianshui, Gansu, China (12.57 km²), from a satellite image of Sep 5, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Gangu Chengguanzhen · AQI 62 (Moderate)
Gangu Chengguanzhen's tree count comes to 46,810 trees across 12.57 km², 15 points below the 30% tree-cover level considered healthy for this area, so roughly 47,438 more trees would close the gap.
Air quality detail
Air quality in Gangu Chengguanzhen today: AQI 62, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 19:00 local time via Open-Meteo / CAMS, corrected with 6 ground-station cities within 245 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 6 station cities within 245 km, e.g. Pingliang and Baoji
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
18.4
PM10
14.0
NO₂
11.9
O₃
61.0
SO₂
6.1
CO
355.0
- 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 Gangu Chengguanzhen's daily AQI at 57 on average, from 45 on Nov 8 to an hourly peak of 89 on Nov 5.
Where Gangu Chengguanzhen stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Gangu Chengguanzhen: Critically low
14.9% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
46,810
Target trees
94,248
More trees needed
47,438
CO₂ if planted / yr
1,044 t
Deforestation · 2001–2025
How much forest has Gangu Chengguanzhen lost?
There was very little forest around Gangu Chengguanzhen in 2000, about 3 hectares, and about 2 hectares of it has been lost since. Only fairly dense woodland counts as forest in these maps, so scattered street and garden trees don't show up here.
2017: satellite photo from June 2017 of a 5 × 5 km area in the city center.
The worst year was 2001, when about 2 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 | 1 ha | 2 ha |
| 2002 | under 1 ha | under 1 ha | under 1 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 | under 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 | under 1 ha | under 1 ha | under 1 ha |
| 2025 | under 1 ha | under 1 ha | under 1 ha |
What is causing deforestation around Gangu Chengguanzhen?
- Towns and roadscleared for good43% · under 1 ha
- Unknown causescause unknown52% · 1 ha
Causes for 2025 are estimates, based on what caused forest loss in the same places up to 2024.
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. Images: contains modified Copernicus Sentinel data. How it's measured
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Frequently asked
Questions about Gangu Chengguanzhen
What is the air quality (AQI) in Gangu Chengguanzhen right now?
The latest reading for Gangu Chengguanzhen shows an AQI of 62 (Moderate), observed Nov 11, 19:00 local time via Open-Meteo / CAMS, corrected with 6 ground-station cities within 245 km, US EPA index. The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Gangu Chengguanzhen today?
At AQI 62 (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 Gangu Chengguanzhen been like this week?
Over the last 7 days, the CAMS air-quality model put Gangu Chengguanzhen's daily AQI at 57 on average, from 45 on Nov 8 to an hourly peak of 89 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 Gangu Chengguanzhen lost since 2001?
There was very little forest around Gangu Chengguanzhen in 2000, about 3 hectares, and about 2 hectares of it has been lost since. Only fairly dense woodland counts as forest in these maps, so scattered street and garden trees don't show up here.
What is the tree count in Gangu Chengguanzhen?
Gangu Chengguanzhen has an estimated 46,810 trees across the 12.57 km² measured — 14.9% tree cover, 15 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Gangu Chengguanzhen need?
Gangu Chengguanzhen needs roughly 47,438 more trees to close a 15-point shortfall against its 30% tree-cover target — about 1,044 t of extra CO₂ absorbed per year once grown.
How are Gangu Chengguanzhen's air quality and tree cover measured?
Air quality comes from ground monitoring stations via OpenAQ where one reports nearby, and otherwise, as here, from the Open-Meteo / CAMS model, which may differ from street-level monitors. 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 Gangu County; the tree count is an estimate derived from that cover.
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