City report · Hunan, China
Hongjiang Air quality today
Air quality in Hongjiang currently reads AQI 54 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 54
Moderate
- PM2.5, fine particles (µg/m³)
- 12.3
- tree cover
- 73.7%
- trees in this area
- 215K
- more trees needed
- 0
Measured across a 2 km radius around Hongjiang, Huaihua, Hunan, China (12.57 km²), from a satellite image of Sep 26, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Hongjiang · AQI 54 (Moderate)
Hongjiang's tree count comes to 215,328 trees across 11.69 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Hongjiang today: AQI 54, Moderate
Main pollutant: PM2.5 · Observed Nov 10, 20:00 local time via Open-Meteo / CAMS, corrected with 7 ground-station cities within 245 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 7 station cities within 245 km, e.g. Huaihua and Shaoyang
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
12.3
PM10
26.5
NO₂
11.4
O₃
56.0
SO₂
16.7
CO
316.0
- 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 Hongjiang's daily AQI at 52 on average, from 38 on Nov 4 to an hourly peak of 85 on Nov 10.
Where Hongjiang stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Hongjiang: Healthy tree cover
73.7% tree cover against a 30% healthy-neighborhood target, across 11.69 km² of land.
Trees in this area
215,328
Target trees
215,328
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Hongjiang lost?
Since 2001, the area within 10 km of Hongjiang has lost about 1,390 hectares of forest (about 2,000 football pitches): 6.2% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 114 hectares (8.2%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from September 2017 of a 5 × 5 km area about 7 km northeast of the city center.
- Forest lost since 2001
- 1,390 haabout 2,000 football pitches
- Share of its forest
- 6.2%of what there was in 2000
- Cleared for good
- 114 hadeforestation: turned into farms, mines or towns
The worst year was 2007, when about 179 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 | 21 ha | 22 ha |
| 2002 | under 1 ha | 17 ha | 17 ha |
| 2003 | 1 ha | 5 ha | 6 ha |
| 2004 | 3 ha | 28 ha | 31 ha |
| 2005 | under 1 ha | 26 ha | 26 ha |
| 2006 | 4 ha | 110 ha | 113 ha |
| 2007 | 8 ha | 171 ha | 179 ha |
| 2008 | 1 ha | 125 ha | 126 ha |
| 2009 | 3 ha | 87 ha | 90 ha |
| 2010 | 9 ha | 167 ha | 176 ha |
| 2011 | 4 ha | 68 ha | 72 ha |
| 2012 | 6 ha | 107 ha | 113 ha |
| 2013 | 1 ha | 19 ha | 20 ha |
| 2014 | under 1 ha | 24 ha | 24 ha |
| 2015 | 1 ha | 27 ha | 28 ha |
| 2016 | 3 ha | 8 ha | 11 ha |
| 2017 | 4 ha | 57 ha | 61 ha |
| 2018 | 12 ha | 19 ha | 32 ha |
| 2019 | 8 ha | 17 ha | 25 ha |
| 2020 | 4 ha | 8 ha | 12 ha |
| 2021 | 2 ha | 24 ha | 26 ha |
| 2022 | 3 ha | 31 ha | 34 ha |
| 2023 | 6 ha | 38 ha | 44 ha |
| 2024 | 11 ha | 49 ha | 60 ha |
| 2025 | 18 ha | 27 ha | 46 ha |
What is causing deforestation around Hongjiang?
- Loggingcan grow back91% · 1,270 ha
- Towns and roadscleared for good7.2% · 100 ha
- Farms, pasture and plantationscleared for good1% · 14 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
- 27,900 ha
- Forest in 2020
- 27,800 ha
- Overall change
- −115 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Hongjiang stayed about the same size, at about 27,800 hectares: new forest grew on about 61 hectares, and about 175 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 Hongjiang
What is the air quality (AQI) in Hongjiang right now?
The latest reading for Hongjiang shows an AQI of 54 (Moderate), observed Nov 10, 20:00 local time via Open-Meteo / CAMS, corrected with 7 ground-station cities within 245 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 Hongjiang today?
At AQI 54 (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 Hongjiang been like this week?
Over the last 7 days, the CAMS air-quality model put Hongjiang's daily AQI at 52 on average, from 38 on Nov 4 to an hourly peak of 85 on Nov 10. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Hongjiang lost since 2001?
Since 2001, the area within 10 km of Hongjiang has lost about 1,390 hectares of forest (about 2,000 football pitches): 6.2% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 114 hectares (8.2%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Hongjiang stayed about the same size, at about 27,800 hectares: new forest grew on about 61 hectares, and about 175 hectares were lost.
What is the tree count in Hongjiang?
Hongjiang has an estimated 215,328 trees across the 11.69 km² of land measured — 73.7% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Hongjiang need?
Hongjiang has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Hongjiang'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 Hongjiang; the tree count is an estimate derived from that cover.
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