City report · Sichuan, China
Hejiang Air quality today
Air quality in Hejiang currently reads AQI 85 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 85
Moderate
- PM2.5, fine particles (µg/m³)
- 24.2
- tree cover
- 60.2%
- trees in this area
- 150K
- more trees needed
- 0
Measured across a 2 km radius around Hejiang County, Luzhou, Sichuan, China (12.57 km²), from a satellite image of Sep 7, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Hejiang · AQI 85 (Moderate)
Hejiang's tree count comes to 149,786 trees across 9.96 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Hejiang today: AQI 85, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 13:00 local time via Open-Meteo / CAMS, corrected with 12 ground-station cities within 125 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 12 station cities within 125 km, e.g. Luzhou and Yongchuan District, Chongqing, China
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
24.2
PM10
25.4
NO₂
13.1
O₃
75.0
SO₂
16.0
CO
484.0
- 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 Hejiang's daily AQI at 82 on average, from 65 on Nov 8 to an hourly peak of 124 on Nov 6.
Where Hejiang stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Hejiang: Healthy tree cover
60.2% tree cover against a 30% healthy-neighborhood target, across 9.96 km² of land.
Trees in this area
149,786
Target trees
149,786
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Hejiang lost?
Since 2001, the area within 10 km of Hejiang has lost about 140 hectares of forest (about 200 football pitches): 1.1% of the forest it had in 2000. Most of it (80%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations.
2017: satellite photo from October 2017 of a 5 × 5 km area about 7 km east of the city center.
- Forest lost since 2001
- 140 haabout 200 football pitches
- Share of its forest
- 1.1%of what there was in 2000
- Cleared for good
- 113 hadeforestation: turned into farms, mines or towns
The worst year was 2024, when about 25 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 | under 1 ha | 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 | 1 ha |
| 2007 | 1 ha | under 1 ha | 2 ha |
| 2008 | 3 ha | under 1 ha | 4 ha |
| 2009 | 5 ha | 1 ha | 6 ha |
| 2010 | 6 ha | 3 ha | 8 ha |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | 2 ha | under 1 ha | 2 ha |
| 2013 | 8 ha | 4 ha | 12 ha |
| 2014 | 3 ha | under 1 ha | 4 ha |
| 2015 | under 1 ha | under 1 ha | 1 ha |
| 2016 | 2 ha | under 1 ha | 3 ha |
| 2017 | 12 ha | 2 ha | 14 ha |
| 2018 | 9 ha | under 1 ha | 9 ha |
| 2019 | 3 ha | under 1 ha | 3 ha |
| 2020 | 10 ha | 1 ha | 12 ha |
| 2021 | 17 ha | 2 ha | 19 ha |
| 2022 | under 1 ha | under 1 ha | under 1 ha |
| 2023 | 5 ha | under 1 ha | 5 ha |
| 2024 | 22 ha | 4 ha | 25 ha |
| 2025 | 2 ha | 6 ha | 7 ha |
What is causing deforestation around Hejiang?
- Farms, pasture and plantationscleared for good43% · 60 ha
- Towns and roadscleared for good38% · 53 ha
- Loggingcan grow back2.3% · 3 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
- 21,800 ha
- Forest in 2020
- 21,600 ha
- Overall change
- −225 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Hejiang stayed about the same size, at about 21,600 hectares: new forest grew on about 79 hectares, and about 303 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 Hejiang
What is the air quality (AQI) in Hejiang right now?
The latest reading for Hejiang shows an AQI of 85 (Moderate), observed Nov 11, 13:00 local time via Open-Meteo / CAMS, corrected with 12 ground-station cities within 125 km, US EPA index. The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Hejiang today?
At AQI 85 (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 Hejiang been like this week?
Over the last 7 days, the CAMS air-quality model put Hejiang's daily AQI at 82 on average, from 65 on Nov 8 to an hourly peak of 124 on Nov 6. On 1 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Hejiang lost since 2001?
Since 2001, the area within 10 km of Hejiang has lost about 140 hectares of forest (about 200 football pitches): 1.1% of the forest it had in 2000. Most of it (80%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations. Comparing satellite maps from 2000 and 2020, the forest around Hejiang stayed about the same size, at about 21,600 hectares: new forest grew on about 79 hectares, and about 303 hectares were lost.
What is the tree count in Hejiang?
Hejiang has an estimated 149,786 trees across the 9.96 km² of land measured — 60.2% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Hejiang need?
Hejiang has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Hejiang'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 Hejiang County; the tree count is an estimate derived from that cover.
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