City report · Heilongjiang, China
Hailun Air quality today
Air quality in Hailun currently reads AQI 429 (Hazardous): Emergency conditions — avoid outdoor activity.
AQI 429
Air quality right now
Hazardous
- PM2.5, fine particles (µg/m³)
- 273.2
- tree cover
- 9.7%
- trees in this area
- 30.4K
- more trees needed
- 111K
Measured across a 2 km radius around Hailun, Suihua, Heilongjiang, China (12.57 km²), from a satellite image of Sep 24, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Hailun · AQI 429 (Hazardous)
Hailun's tree count comes to 30,382 trees across 12.53 km² of land, 35 points below the 45% tree-cover level considered healthy for this area, so roughly 110,566 more trees would close the gap.
Air quality detail
Air quality in Hailun today: AQI 429, Hazardous
Main pollutant: PM2.5 · Observed Nov 11, 00:00 local time via Open-Meteo / CAMS, corrected with 4 ground-station cities within 185 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 4 station cities within 185 km, e.g. Suihua and Daqing
Health signal
Emergency conditions — avoid outdoor activity.
PM2.5
273.2
PM10
72.9
NO₂
30.4
O₃
34.0
SO₂
21.1
CO
929.0
- Outdoor exercise
- Everyone should avoid all outdoor exertion
- Windows
- Keep them closed and seal gaps
- Mask
- Wear an N95 if you must go out
- Air purifier
- Run one on high
Over the last 7 days, the CAMS air-quality model put Hailun's daily AQI at 94 on average, from 57 on Nov 5 to an hourly peak of 167 on Nov 10.
Where Hailun stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Hailun: Critically low
9.7% tree cover against a 45% healthy-neighborhood target, across 12.53 km² of land.
Trees in this area
30,382
Target trees
140,948
More trees needed
110,566
CO₂ if planted / yr
2,432 t
Deforestation · 2001–2025
How much forest has Hailun lost?
There was very little forest around Hailun in 2000, about 40 hectares, and about 2 hectares of it has been lost 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.
Hectares of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | under 1 ha | under 1 ha | under 1 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 | under 1 ha | under 1 ha |
| 2005 | under 1 ha | under 1 ha | under 1 ha |
| 2006 | under 1 ha | under 1 ha | under 1 ha |
| 2007 | under 1 ha | under 1 ha | under 1 ha |
| 2008 | under 1 ha | under 1 ha | under 1 ha |
| 2009 | under 1 ha | under 1 ha | under 1 ha |
| 2010 | under 1 ha | under 1 ha | under 1 ha |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | under 1 ha | under 1 ha | under 1 ha |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | under 1 ha | under 1 ha | under 1 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | under 1 ha | under 1 ha | under 1 ha |
| 2017 | under 1 ha | under 1 ha | under 1 ha |
| 2018 | under 1 ha | under 1 ha | under 1 ha |
| 2019 | under 1 ha | under 1 ha | under 1 ha |
| 2020 | under 1 ha | under 1 ha | under 1 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 | under 1 ha | under 1 ha |
| 2025 | under 1 ha | under 1 ha | under 1 ha |
What is causing deforestation around Hailun?
- Farms, pasture and plantationscleared for good33% · under 1 ha
- Loggingcan grow back21% · under 1 ha
- Towns and roadscleared for good4.2% · under 1 ha
Also: 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
- 133 ha
- Forest in 2020
- 296 ha
- Overall change
- +163 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Hailun grew from about 133 hectares to 296 hectares, a net gain of about 163 hectares (+123%). New forest grew on about 170 hectares, while 7 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 Hailun
What is the air quality (AQI) in Hailun right now?
The latest reading for Hailun shows an AQI of 429 (Hazardous), observed Nov 11, 00:00 local time via Open-Meteo / CAMS, corrected with 4 ground-station cities within 185 km, US EPA index. The main pollutant is PM2.5. Emergency conditions — avoid outdoor activity.
Is it safe to exercise outside in Hailun today?
At AQI 429 (Hazardous): everyone should avoid all outdoor exertion. Windows: keep them closed and seal gaps. Masks: wear an N95 if you must go out. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Hailun been like this week?
Over the last 7 days, the CAMS air-quality model put Hailun's daily AQI at 94 on average, from 57 on Nov 5 to an hourly peak of 167 on Nov 10. On 3 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Hailun lost since 2001?
There was very little forest around Hailun in 2000, about 40 hectares, and about 2 hectares of it has been lost 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 Hailun grew from about 133 hectares to 296 hectares, a net gain of about 163 hectares (+123%). New forest grew on about 170 hectares, while 7 hectares were lost.
What is the tree count in Hailun?
Hailun has an estimated 30,382 trees across the 12.53 km² of land measured — 9.7% tree cover, 35 percentage points short of the 45% tree-cover target set for this area.
How many more trees does Hailun need?
Hailun needs roughly 110,566 more trees to close a 35-point shortfall against its 45% tree-cover target — about 2,432 t of extra CO₂ absorbed per year once grown.
How are Hailun'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 Hailun; the tree count is an estimate derived from that cover.
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