City report · Gansu, China
Lanzhou Air quality today
Air quality in Lanzhou currently reads AQI 159 (Unhealthy): Everyone should limit long outdoor exertion; sensitive groups more so.
Air quality right now
AQI 159
Unhealthy
- PM2.5, fine particles (µg/m³)
- 67.1
- tree cover
- 11.6%
- trees in this area
- 34.7K
- more trees needed
- 85.0K
Measured across a 2 km radius around Chengguan District, Lanzhou, Lanzhou, Gansu, China (12.57 km²), from a satellite image of Sep 22, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Lanzhou · AQI 159 (Unhealthy)
Lanzhou's tree count comes to 34,730 trees across 11.98 km² of land, 28 points below the 40% tree-cover level considered healthy for this area, so roughly 85,028 more trees would close the gap.
Air quality detail
Air quality in Lanzhou today: AQI 159, Unhealthy
Main pollutant: PM2.5 · Observed Nov 11, 22:00 local time via World Air Quality Index Project ground stations, US EPA index. Values in µg/m³.
Ground station · Railway Design Institute, Lanzhou (兰州铁路设计院), 1.4 km away
Health signal
Everyone should limit long outdoor exertion; sensitive groups more so.
PM2.5
67.1
PM10
103.5
NO₂
—
O₃
—
SO₂
—
CO
—
Data: World Air Quality Index Project, Gangsu Environmental Protection Agency (甘肃省生态环境厅), China National Urban air quality real-time publishing platform (全国城市空气质量实时发布平台)
- Outdoor exercise
- Everyone should cut down long or hard exercise; sensitive groups should avoid it
- Windows
- Keep them closed
- Mask
- Wear an N95 outdoors
- Air purifier
- Run one
Over the last 7 days, the CAMS air-quality model put Lanzhou's daily AQI at 85 on average, from 57 on Nov 8 to an hourly peak of 139 on Nov 6.
Where Lanzhou stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Lanzhou: Critically low
11.6% tree cover against a 40% healthy-neighborhood target, across 11.98 km² of land.
Trees in this area
34,730
Target trees
119,758
More trees needed
85,028
CO₂ if planted / yr
1,871 t
Deforestation · 2001–2025
How much forest has Lanzhou lost?
There was almost no forest around Lanzhou in 2000, so there has been almost nothing to lose 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 July 2017 of a 5 × 5 km area in the city center.
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 Lanzhou
What is the air quality (AQI) in Lanzhou right now?
The latest reading for Lanzhou shows an AQI of 159 (Unhealthy), measured Nov 11, 22:00 local time by the Railway Design Institute, Lanzhou (兰州铁路设计院) ground monitoring station, 1.4 km away, via OpenAQ. The main pollutant is PM2.5. Everyone should limit long outdoor exertion; sensitive groups more so.
Is it safe to exercise outside in Lanzhou today?
At AQI 159 (Unhealthy): everyone should cut down long or hard exercise; sensitive groups should avoid it. Windows: keep them closed. Masks: wear an N95 outdoors. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Lanzhou been like this week?
Over the last 7 days, the CAMS air-quality model put Lanzhou's daily AQI at 85 on average, from 57 on Nov 8 to an hourly peak of 139 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 Lanzhou lost since 2001?
There was almost no forest around Lanzhou in 2000, so there has been almost nothing to lose 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 Lanzhou?
Lanzhou has an estimated 34,730 trees across the 11.98 km² of land measured — 11.6% tree cover, 28 percentage points short of the 40% tree-cover target set for this area.
How many more trees does Lanzhou need?
Lanzhou needs roughly 85,028 more trees to close a 28-point shortfall against its 40% tree-cover target — about 1,871 t of extra CO₂ absorbed per year once grown.
How are Lanzhou's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Chengguan 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 Chengguan District; the tree count is an estimate derived from that cover.
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