City report · Jiangxi, China
Ji’an Air quality today
Air quality in Ji’an currently reads AQI 73 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 73
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 21.1
- tree cover
- 11.2%
- trees in this area
- 29.7K
- more trees needed
- 49.8K
Measured across a 2 km radius around Jizhou, Ji'An, Jiangxi, China (12.57 km²), from a satellite image of Sep 25, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Ji’an · AQI 73 (Moderate)
Ji’an's tree count comes to 29,662 trees across 10.6 km² of land, 19 points below the 30% tree-cover level considered healthy for this area, so roughly 49,789 more trees would close the gap.
Air quality detail
Air quality in Ji’an today: AQI 73, Moderate
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 · City Environmental Monitoring Station, Ji'an (吉安市环境监测站), 1.9 km away · median of 3 stations
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
21.1
PM10
51.8
NO₂
—
O₃
—
SO₂
—
CO
—
Data: World Air Quality Index Project, Jiangxi Province Environmental Protection Agency (江西省环境保护厅)
- 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 Ji’an's daily AQI at 55 on average, from 28 on Nov 8 to an hourly peak of 98 on Nov 11.
Where Ji’an stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Ji’an: Critically low
11.2% tree cover against a 30% healthy-neighborhood target, across 10.6 km² of land.
Trees in this area
29,662
Target trees
79,451
More trees needed
49,789
CO₂ if planted / yr
1,095 t
Deforestation · 2001–2025
How much forest has Ji’an lost?
Since 2001, the area within 10 km of Ji’an has lost about 204 hectares of forest (about 290 football pitches): 13% of the forest it had in 2000. Most of it (59%) was deforestation, forest cleared for good, mainly for towns and roads.
2018: satellite photo from November 2017 of a 5 × 5 km area about 7 km east of the city center.
- Forest lost since 2001
- 204 haabout 290 football pitches
- Share of its forest
- 13%of what there was in 2000
- Cleared for good
- 120 hadeforestation: turned into farms, mines or towns
The worst year was 2020, when about 18 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 | 2 ha |
| 2003 | 3 ha | under 1 ha | 4 ha |
| 2004 | 4 ha | 4 ha | 7 ha |
| 2005 | 2 ha | under 1 ha | 2 ha |
| 2006 | 9 ha | 3 ha | 12 ha |
| 2007 | 4 ha | 2 ha | 6 ha |
| 2008 | 8 ha | 8 ha | 17 ha |
| 2009 | 5 ha | 1 ha | 6 ha |
| 2010 | 4 ha | under 1 ha | 4 ha |
| 2011 | 6 ha | under 1 ha | 6 ha |
| 2012 | 14 ha | 2 ha | 16 ha |
| 2013 | 8 ha | 3 ha | 11 ha |
| 2014 | 9 ha | under 1 ha | 9 ha |
| 2015 | 3 ha | 2 ha | 5 ha |
| 2016 | 9 ha | 2 ha | 11 ha |
| 2017 | 3 ha | under 1 ha | 3 ha |
| 2018 | 4 ha | 5 ha | 9 ha |
| 2019 | 5 ha | 3 ha | 8 ha |
| 2020 | 2 ha | 16 ha | 18 ha |
| 2021 | 6 ha | 11 ha | 17 ha |
| 2022 | 2 ha | 3 ha | 5 ha |
| 2023 | 7 ha | 6 ha | 13 ha |
| 2024 | 4 ha | 8 ha | 12 ha |
| 2025 | 3 ha | under 1 ha | 3 ha |
What is causing deforestation around Ji’an?
- Towns and roadscleared for good50% · 101 ha
- Loggingcan grow back41% · 84 ha
- Farms, pasture and plantationscleared for good9.1% · 19 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
- 4,980 ha
- Forest in 2020
- 4,840 ha
- Overall change
- −138 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Ji’an shrank from about 4,980 hectares to 4,840 hectares, a net loss of about 138 hectares (−2.8%). New forest grew on about 286 hectares, but 424 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 Ji’an
What is the air quality (AQI) in Ji’an right now?
The latest reading for Ji’an shows an AQI of 73 (Moderate), measured Nov 11, 23:00 local time by 3 ground monitoring stations via OpenAQ (the median of their readings; the nearest is City Environmental Monitoring Station, Ji'an (吉安市环境监测站), 1.9 km away). The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Ji’an today?
At AQI 73 (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 Ji’an been like this week?
Over the last 7 days, the CAMS air-quality model put Ji’an's daily AQI at 55 on average, from 28 on Nov 8 to an hourly peak of 98 on Nov 11. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Ji’an lost since 2001?
Since 2001, the area within 10 km of Ji’an has lost about 204 hectares of forest (about 290 football pitches): 13% of the forest it had in 2000. Most of it (59%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Ji’an shrank from about 4,980 hectares to 4,840 hectares, a net loss of about 138 hectares (−2.8%). New forest grew on about 286 hectares, but 424 hectares were lost.
What is the tree count in Ji’an?
Ji’an has an estimated 29,662 trees across the 10.6 km² of land measured — 11.2% tree cover, 19 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Ji’an need?
Ji’an needs roughly 49,789 more trees to close a 19-point shortfall against its 30% tree-cover target — about 1,095 t of extra CO₂ absorbed per year once grown.
How are Ji’an's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Jizhou, 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 Jizhou; the tree count is an estimate derived from that cover.
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