City report · Heilongjiang, China
Hailin Air quality today
Air quality in Hailin currently reads AQI 163 (Unhealthy): Everyone should limit long outdoor exertion; sensitive groups more so.
AQI 163
Air quality right now
Unhealthy
- PM2.5, fine particles (µg/m³)
- 72.0
- tree cover
- 15.1%
- trees in this area
- 47.4K
- more trees needed
- 78.2K
Measured across a 2 km radius around Hailin, Mudanjiang, Heilongjiang, China (12.57 km²), from a satellite image of Sep 18, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Hailin · AQI 163 (Unhealthy)
Hailin's tree count comes to 47,438 trees across 12.57 km², 25 points below the 40% tree-cover level considered healthy for this area, so roughly 78,226 more trees would close the gap.
Air quality detail
Air quality in Hailin today: AQI 163, Unhealthy
Main pollutant: PM2.5 · Observed Nov 11, 23:00 local time via World Air Quality Index Project ground stations, US EPA index. Values in µg/m³.
Ground station · Mudanjiang (牡丹江), 19.8 km away · median of 2 stations
Health signal
Everyone should limit long outdoor exertion; sensitive groups more so.
PM2.5
72.0
PM10
123.7
NO₂
—
O₃
—
SO₂
—
CO
—
Data: World Air Quality Index Project, Helongjiang Environmental Protection Agency (黑龙江省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 Hailin's daily AQI at 84 on average, from 60 on Nov 7 to an hourly peak of 154 on Nov 11.
Where Hailin stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Hailin: Critically low
15.1% tree cover against a 40% healthy-neighborhood target, across 12.57 km².
Trees in this area
47,438
Target trees
125,664
More trees needed
78,226
CO₂ if planted / yr
1,721 t
Deforestation · 2001–2025
How much forest has Hailin lost?
Since 2001, the area within 10 km of Hailin has lost about 77 hectares of forest (about 110 football pitches): 2.3% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 17 hectares (21%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from July 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 77 haabout 110 football pitches
- Share of its forest
- 2.3%of what there was in 2000
- Cleared for good
- 17 hadeforestation: turned into farms, mines or towns
The worst year was 2016, when about 11 hectares of forest were lost.
Hectares of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | under 1 ha | 2 ha | 2 ha |
| 2002 | under 1 ha | under 1 ha | under 1 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | under 1 ha | 2 ha | 2 ha |
| 2005 | under 1 ha | under 1 ha | under 1 ha |
| 2006 | under 1 ha | 3 ha | 3 ha |
| 2007 | under 1 ha | 2 ha | 2 ha |
| 2008 | under 1 ha | 2 ha | 2 ha |
| 2009 | under 1 ha | under 1 ha | under 1 ha |
| 2010 | under 1 ha | 3 ha | 3 ha |
| 2011 | under 1 ha | 2 ha | 3 ha |
| 2012 | under 1 ha | 7 ha | 8 ha |
| 2013 | under 1 ha | 7 ha | 8 ha |
| 2014 | under 1 ha | 6 ha | 6 ha |
| 2015 | under 1 ha | under 1 ha | 1 ha |
| 2016 | 10 ha | 1 ha | 11 ha |
| 2017 | under 1 ha | 1 ha | 1 ha |
| 2018 | under 1 ha | 3 ha | 4 ha |
| 2019 | 2 ha | 6 ha | 8 ha |
| 2020 | under 1 ha | 2 ha | 2 ha |
| 2021 | under 1 ha | under 1 ha | under 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 | 5 ha | 5 ha |
| 2025 | under 1 ha | 3 ha | 3 ha |
What is causing deforestation around Hailin?
- Loggingcan grow back56% · 43 ha
- Towns and roadscleared for good17% · 13 ha
- Wildfirescan grow back12% · 9 ha
Also: farms, pasture and plantations, mining and energy, 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
- 4,980 ha
- Forest in 2020
- 6,260 ha
- Overall change
- +1,280 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Hailin grew from about 4,980 hectares to 6,260 hectares, a net gain of about 1,280 hectares (+26%). New forest grew on about 1,350 hectares, while 73 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 Hailin
What is the air quality (AQI) in Hailin right now?
The latest reading for Hailin shows an AQI of 163 (Unhealthy), measured Nov 11, 23:00 local time by 2 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Mudanjiang (牡丹江), 19.8 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 Hailin today?
At AQI 163 (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 Hailin been like this week?
Over the last 7 days, the CAMS air-quality model put Hailin's daily AQI at 84 on average, from 60 on Nov 7 to an hourly peak of 154 on Nov 11. On 1 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Hailin lost since 2001?
Since 2001, the area within 10 km of Hailin has lost about 77 hectares of forest (about 110 football pitches): 2.3% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 17 hectares (21%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Hailin grew from about 4,980 hectares to 6,260 hectares, a net gain of about 1,280 hectares (+26%). New forest grew on about 1,350 hectares, while 73 hectares were lost.
What is the tree count in Hailin?
Hailin has an estimated 47,438 trees across the 12.57 km² measured — 15.1% tree cover, 25 percentage points short of the 40% tree-cover target set for this area.
How many more trees does Hailin need?
Hailin needs roughly 78,226 more trees to close a 25-point shortfall against its 40% tree-cover target — about 1,721 t of extra CO₂ absorbed per year once grown.
How are Hailin's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Hailin, 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 Hailin; the tree count is an estimate derived from that cover.
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