City report · Shandong, China
Weihai Air quality today
Air quality in Weihai currently reads AQI 65 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 65
Moderate
- PM2.5, fine particles (µg/m³)
- 16.4
- tree cover
- 30.8%
- trees in this area
- 82.0K
- more trees needed
- 0
Measured across a 2 km radius around Huancui District, Weihai, Shandong, China (12.57 km²), from a satellite image of Sep 19, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Weihai · AQI 65 (Moderate)
Weihai's tree count comes to 81,957 trees across 10.65 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Weihai today: AQI 65, Moderate
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 · Weihai (威海), 700 m away · median of 4 stations
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
16.4
PM10
29.7
NO₂
—
O₃
—
SO₂
—
CO
—
Data: World Air Quality Index Project, Environmental Protection Department of Shandong Province (山东省环境保护厅)
- 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 Weihai's daily AQI at 65 on average, from 45 on Nov 9 to an hourly peak of 119 on Nov 5.
Where Weihai stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Weihai: Healthy tree cover
30.8% tree cover against a 30% healthy-neighborhood target, across 10.65 km² of land.
Trees in this area
81,957
Target trees
81,957
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Weihai lost?
Since 2001, the area within 10 km of Weihai has lost about 167 hectares of forest (about 230 football pitches): 12% of the forest it had in 2000. The biggest cause was wildfires (35%), after which forest can grow back. About 70 hectares (42%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from June 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 167 haabout 230 football pitches
- Share of its forest
- 12%of what there was in 2000
- Cleared for good
- 70 hadeforestation: turned into farms, mines or towns
The worst year was 2014, when about 48 hectares of forest were lost, mostly to wildfires.
Hectares of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | 11 ha | 4 ha | 15 ha |
| 2002 | 4 ha | 1 ha | 5 ha |
| 2003 | 2 ha | under 1 ha | 2 ha |
| 2004 | 3 ha | 1 ha | 4 ha |
| 2005 | 3 ha | 2 ha | 6 ha |
| 2006 | 2 ha | under 1 ha | 2 ha |
| 2007 | 3 ha | under 1 ha | 3 ha |
| 2008 | 8 ha | 2 ha | 10 ha |
| 2009 | under 1 ha | under 1 ha | 1 ha |
| 2010 | under 1 ha | under 1 ha | under 1 ha |
| 2011 | 3 ha | under 1 ha | 4 ha |
| 2012 | 2 ha | 3 ha | 5 ha |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | 11 ha | 37 ha | 48 ha |
| 2015 | 2 ha | 3 ha | 5 ha |
| 2016 | 5 ha | 13 ha | 18 ha |
| 2017 | 1 ha | under 1 ha | 1 ha |
| 2018 | under 1 ha | under 1 ha | under 1 ha |
| 2019 | 2 ha | 6 ha | 7 ha |
| 2020 | 6 ha | 23 ha | 29 ha |
| 2021 | under 1 ha | under 1 ha | 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 Weihai?
- Wildfirescan grow back35% · 59 ha
- Towns and roadscleared for good31% · 52 ha
- Loggingcan grow back23% · 38 ha
Also: farms, pasture and plantations, 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
- 2,780 ha
- Forest in 2020
- 2,360 ha
- Overall change
- −423 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Weihai shrank from about 2,780 hectares to 2,360 hectares, a net loss of about 423 hectares (−15%). New forest grew on about 240 hectares, but 663 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 Weihai
What is the air quality (AQI) in Weihai right now?
The latest reading for Weihai shows an AQI of 65 (Moderate), measured Nov 11, 22:00 local time by 4 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Weihai (威海), 700 m away). The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Weihai today?
At AQI 65 (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 Weihai been like this week?
Over the last 7 days, the CAMS air-quality model put Weihai's daily AQI at 65 on average, from 45 on Nov 9 to an hourly peak of 119 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 Weihai lost since 2001?
Since 2001, the area within 10 km of Weihai has lost about 167 hectares of forest (about 230 football pitches): 12% of the forest it had in 2000. The biggest cause was wildfires (35%), after which forest can grow back. About 70 hectares (42%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Weihai shrank from about 2,780 hectares to 2,360 hectares, a net loss of about 423 hectares (−15%). New forest grew on about 240 hectares, but 663 hectares were lost.
What is the tree count in Weihai?
Weihai has an estimated 81,957 trees across the 10.65 km² of land measured — 30.8% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Weihai need?
Weihai has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Weihai's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Huancui 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 Huancui District; the tree count is an estimate derived from that cover.
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