City report · Shandong, China
Changyi Air quality today
Air quality in Changyi currently reads AQI 146 (Unhealthy for sensitive groups): Sensitive groups should limit long or intense outdoor activity.
Air quality right now
AQI 146
Unhealthy for sensitive groups
- PM2.5, fine particles (µg/m³)
- 53.9
- tree cover
- 12.3%
- trees in this area
- 38.6K
- more trees needed
- 71.3K
Measured across a 2 km radius around Changyi, Weifang, Shandong, China (12.57 km²), from a satellite image of Sep 22, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Changyi · AQI 146 (Unhealthy for sensitive groups)
Changyi's tree count comes to 38,642 trees across 12.57 km², 23 points below the 35% tree-cover level considered healthy for this area, so roughly 71,314 more trees would close the gap.
Air quality detail
Air quality in Changyi today: AQI 146, Unhealthy for sensitive groups
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 · Changyi Highway Bureau, Changyi City (昌邑市昌邑公路局), 1.3 km away · median of 2 stations
Health signal
Sensitive groups should limit long or intense outdoor activity.
PM2.5
53.9
PM10
76.2
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
- Children, older adults and people with asthma or heart disease should cut down long or hard exercise
- Windows
- Close them to keep the outside air out
- Mask
- Sensitive groups: an N95 outdoors
- Air purifier
- Run one, especially in bedrooms
Over the last 7 days, the CAMS air-quality model put Changyi's daily AQI at 105 on average, from 58 on Nov 9 to an hourly peak of 172 on Nov 10.
Where Changyi stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Changyi: Critically low
12.3% tree cover against a 35% healthy-neighborhood target, across 12.57 km².
Trees in this area
38,642
Target trees
109,956
More trees needed
71,314
CO₂ if planted / yr
1,569 t
Deforestation · 2001–2025
How much forest has Changyi lost?
There was almost no forest around Changyi 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
- 51 ha
- Forest in 2020
- 166 ha
- Overall change
- +115 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Changyi grew from about 51 hectares to 166 hectares, a net gain of about 115 hectares. New forest grew on about 115 hectares, while under 1 hectare was 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
In the same region
Measured cities near Changyi
Same 2 km radius, same index — so they compare directly.
Build your own
Compare Changyi with anywhere
This place
Changyi
Use this data
Put Changyi's numbers on your site
Free to embed. Updates itself as the measurement refreshes.
Frequently asked
Questions about Changyi
What is the air quality (AQI) in Changyi right now?
The latest reading for Changyi shows an AQI of 146 (Unhealthy for sensitive groups), measured Nov 11, 22:00 local time by 2 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Changyi Highway Bureau, Changyi City (昌邑市昌邑公路局), 1.3 km away). The main pollutant is PM2.5. Sensitive groups should limit long or intense outdoor activity.
Is it safe to exercise outside in Changyi today?
At AQI 146 (Unhealthy for sensitive groups): children, older adults and people with asthma or heart disease should cut down long or hard exercise. Windows: close them to keep the outside air out. Masks: sensitive groups: an N95 outdoors. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Changyi been like this week?
Over the last 7 days, the CAMS air-quality model put Changyi's daily AQI at 105 on average, from 58 on Nov 9 to an hourly peak of 172 on Nov 10. On 4 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Changyi lost since 2001?
There was almost no forest around Changyi 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 Changyi grew from about 51 hectares to 166 hectares, a net gain of about 115 hectares. New forest grew on about 115 hectares, while under 1 hectare was lost.
What is the tree count in Changyi?
Changyi has an estimated 38,642 trees across the 12.57 km² measured — 12.3% tree cover, 23 percentage points short of the 35% tree-cover target set for this area.
How many more trees does Changyi need?
Changyi needs roughly 71,314 more trees to close a 23-point shortfall against its 35% tree-cover target — about 1,569 t of extra CO₂ absorbed per year once grown.
How are Changyi's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Changyi, 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 Changyi; the tree count is an estimate derived from that cover.
See your own area
What does your neighborhood look like?
Pick any point and radius to get the same air-quality and tree-cover breakdown.
Check my address