City report · Hebei, China
Sanhe Air quality today
Air quality in Sanhe currently reads AQI 195 (Unhealthy): Everyone should limit long outdoor exertion; sensitive groups more so.
Air quality right now
AQI 195
Unhealthy
- PM2.5, fine particles (µg/m³)
- 118.5
- tree cover
- 12.4%
- trees in this area
- 38.8K
- more trees needed
- 86.4K
Measured across a 2 km radius around Sanhe, Langfang, Hebei, China (12.57 km²), from a satellite image of Sep 23, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Sanhe · AQI 195 (Unhealthy)
Sanhe's tree count comes to 38,800 trees across 12.52 km² of land, 28 points below the 40% tree-cover level considered healthy for this area, so roughly 86,361 more trees would close the gap.
Air quality detail
Air quality in Sanhe today: AQI 195, Unhealthy
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 · Dachang County Government, Langfang (廊坊市大厂县政府), 11.6 km away · median of 4 stations
Health signal
Everyone should limit long outdoor exertion; sensitive groups more so.
PM2.5
118.5
PM10
152.4
NO₂
—
O₃
—
SO₂
—
CO
—
Data: World Air Quality Index Project, Hebei Province Environment Protection Agency (河北省空气质量自动发布系统), Beijing Environmental Protection Monitoring Center (北京市环境保护监测中心)
- 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 Sanhe's daily AQI at 117 on average, from 76 on Nov 7 to an hourly peak of 184 on Nov 4.
Where Sanhe stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Sanhe: Critically low
12.4% tree cover against a 40% healthy-neighborhood target, across 12.52 km² of land.
Trees in this area
38,800
Target trees
125,161
More trees needed
86,361
CO₂ if planted / yr
1,900 t
Deforestation · 2001–2025
How much forest has Sanhe lost?
There was almost no forest around Sanhe 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 June 2017 of a 5 × 5 km area in the city center.
Forest gained and lost, 2000–2020
- Forest in 2000
- 714 ha
- Forest in 2020
- 2,180 ha
- Overall change
- +1,460 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Sanhe grew from about 714 hectares to 2,180 hectares, a net gain of about 1,460 hectares (+205%). New forest grew on about 1,470 hectares, while 3 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 Sanhe
What is the air quality (AQI) in Sanhe right now?
The latest reading for Sanhe shows an AQI of 195 (Unhealthy), measured Nov 11, 21:00 local time by 4 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Dachang County Government, Langfang (廊坊市大厂县政府), 11.6 km away). The main pollutant is PM2.5. Everyone should limit long outdoor exertion; sensitive groups more so.
Is it safe to exercise outside in Sanhe today?
At AQI 195 (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 Sanhe been like this week?
Over the last 7 days, the CAMS air-quality model put Sanhe's daily AQI at 117 on average, from 76 on Nov 7 to an hourly peak of 184 on Nov 4. On 4 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Sanhe lost since 2001?
There was almost no forest around Sanhe 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. Comparing satellite maps from 2000 and 2020, the forest around Sanhe grew from about 714 hectares to 2,180 hectares, a net gain of about 1,460 hectares (+205%). New forest grew on about 1,470 hectares, while 3 hectares were lost.
What is the tree count in Sanhe?
Sanhe has an estimated 38,800 trees across the 12.52 km² of land measured — 12.4% tree cover, 28 percentage points short of the 40% tree-cover target set for this area.
How many more trees does Sanhe need?
Sanhe needs roughly 86,361 more trees to close a 28-point shortfall against its 40% tree-cover target — about 1,900 t of extra CO₂ absorbed per year once grown.
How are Sanhe's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Sanhe, 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 Sanhe; the tree count is an estimate derived from that cover.
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