City report · Heilongjiang, China
Acheng Air quality today
Air quality in Acheng currently reads AQI 421 (Hazardous): Emergency conditions — avoid outdoor activity.
Air quality right now
AQI 421
Hazardous
- PM2.5, fine particles (µg/m³)
- 238.2
- tree cover
- 12.6%
- trees in this area
- 39.5K
- more trees needed
- 102K
Measured across a 2 km radius around Acheng District, Harbin, 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.
Acheng · AQI 421 (Hazardous)
Acheng's tree count comes to 39,505 trees across 12.54 km² of land, 32 points below the 45% tree-cover level considered healthy for this area, so roughly 101,584 more trees would close the gap.
Air quality detail
Air quality in Acheng today: AQI 421, Hazardous
Main pollutant: PM2.5 · Observed Nov 11, 03:00 local time via Open-Meteo / CAMS, corrected with 9 ground-station cities within 205 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 9 station cities within 205 km, e.g. Harbin and Harbin
Health signal
Emergency conditions — avoid outdoor activity.
PM2.5
238.2
PM10
92.2
NO₂
51.3
O₃
0.0
SO₂
42.2
CO
915.0
- 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 Acheng's daily AQI at 112 on average, from 71 on Nov 6 to an hourly peak of 228 on Nov 5.
Where Acheng stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Acheng: Critically low
12.6% tree cover against a 45% healthy-neighborhood target, across 12.54 km² of land.
Trees in this area
39,505
Target trees
141,089
More trees needed
101,584
CO₂ if planted / yr
2,235 t
Deforestation · 2001–2025
How much forest has Acheng lost?
Since 2001, the area within 10 km of Acheng has lost about 12 hectares of forest (about 17 football pitches): 10% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 3 hectares (27%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from September 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 12 haabout 17 football pitches
- Share of its forest
- 10%of what there was in 2000
- Cleared for good
- 3 hadeforestation: turned into farms, mines or towns
The worst year was 2003, when about 3 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 | under 1 ha | under 1 ha |
| 2002 | under 1 ha | under 1 ha | under 1 ha |
| 2003 | under 1 ha | 3 ha | 3 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 | 1 ha | 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 Acheng?
- Loggingcan grow back63% · 8 ha
- Towns and roadscleared for good26% · 3 ha
- Unknown causescause unknown10% · 1 ha
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
- 348 ha
- Forest in 2020
- 447 ha
- Overall change
- +99 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Acheng grew from about 348 hectares to 447 hectares, a net gain of about 99 hectares (+28%). New forest grew on about 129 hectares, while 29 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
In the same region
Measured cities near Acheng
Same 2 km radius, same index — so they compare directly.
- Harbin32.7 km
China
- Tree cover
- 15%
- Air quality
- 159
- Hulan48.3 km
China
- Tree cover
- 22%
- Air quality
- 161
- Shuangcheng53.6 km
China
- Tree cover
- 8%
- Air quality
- 373
- Yushu, Jilin86.1 km
China
- Tree cover
- 7%
- Air quality
- 178
- Shangzhi90.3 km
China
- Tree cover
- 14%
- Air quality
- 183
- Zhaodong95.6 km
China
- Tree cover
- 19%
- Air quality
- 368
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Frequently asked
Questions about Acheng
What is the air quality (AQI) in Acheng right now?
The latest reading for Acheng shows an AQI of 421 (Hazardous), observed Nov 11, 03:00 local time via Open-Meteo / CAMS, corrected with 9 ground-station cities within 205 km, US EPA index. The main pollutant is PM2.5. Emergency conditions — avoid outdoor activity.
Is it safe to exercise outside in Acheng today?
At AQI 421 (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 Acheng been like this week?
Over the last 7 days, the CAMS air-quality model put Acheng's daily AQI at 112 on average, from 71 on Nov 6 to an hourly peak of 228 on Nov 5. On 4 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Acheng lost since 2001?
Since 2001, the area within 10 km of Acheng has lost about 12 hectares of forest (about 17 football pitches): 10% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 3 hectares (27%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Acheng grew from about 348 hectares to 447 hectares, a net gain of about 99 hectares (+28%). New forest grew on about 129 hectares, while 29 hectares were lost.
What is the tree count in Acheng?
Acheng has an estimated 39,505 trees across the 12.54 km² of land measured — 12.6% tree cover, 32 percentage points short of the 45% tree-cover target set for this area.
How many more trees does Acheng need?
Acheng needs roughly 101,584 more trees to close a 32-point shortfall against its 45% tree-cover target — about 2,235 t of extra CO₂ absorbed per year once grown.
How are Acheng'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 Acheng District; the tree count is an estimate derived from that cover.
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