City report · Henan, China
Yima Air quality today
Air quality in Yima currently reads AQI 52 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 52
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 11.4
- tree cover
- 32.2%
- trees in this area
- 101K
- more trees needed
- 0
Measured across a 2 km radius around Yima, Henan, Sanmenxia, Henan, China (12.57 km²), from a satellite image of Sep 3, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Yima · AQI 52 (Moderate)
Yima's tree count comes to 100,755 trees across 12.52 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Yima today: AQI 52, Moderate
Main pollutant: PM2.5 · Observed Nov 10, 17:00 local time via Open-Meteo / CAMS, corrected with 3 ground-station cities within 105 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 3 station cities within 105 km, e.g. Luoyang and Sanmenxia
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
11.4
PM10
11.7
NO₂
22.2
O₃
57.0
SO₂
5.9
CO
385.0
- 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 Yima's daily AQI at 84 on average, from 44 on Nov 9 to an hourly peak of 157 on Nov 7.
Where Yima stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Yima: Healthy tree cover
32.2% tree cover against a 30% healthy-neighborhood target, across 12.52 km² of land.
Trees in this area
100,755
Target trees
100,755
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Yima lost?
There was almost no forest around Yima 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.
Forest gained and lost, 2000–2020
- Forest in 2000
- 3,280 ha
- Forest in 2020
- 4,120 ha
- Overall change
- +841 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Yima grew from about 3,280 hectares to 4,120 hectares, a net gain of about 841 hectares (+26%). New forest grew on about 857 hectares, while 16 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 Yima
What is the air quality (AQI) in Yima right now?
The latest reading for Yima shows an AQI of 52 (Moderate), observed Nov 10, 17:00 local time via Open-Meteo / CAMS, corrected with 3 ground-station cities within 105 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 Yima today?
At AQI 52 (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 Yima been like this week?
Over the last 7 days, the CAMS air-quality model put Yima's daily AQI at 84 on average, from 44 on Nov 9 to an hourly peak of 157 on Nov 7. On 2 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Yima lost since 2001?
There was almost no forest around Yima 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 Yima grew from about 3,280 hectares to 4,120 hectares, a net gain of about 841 hectares (+26%). New forest grew on about 857 hectares, while 16 hectares were lost.
What is the tree count in Yima?
Yima has an estimated 100,755 trees across the 12.52 km² of land measured — 32.2% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Yima need?
Yima has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Yima'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 Yima; the tree count is an estimate derived from that cover.
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