City report · Yamaguchi, Japan
Yamaguchi Air quality today
Air quality in Yamaguchi currently reads AQI 31 (Good): Air quality is satisfactory for everyone.
AQI 31
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 5.5
- tree cover
- 55.3%
- trees in this area
- 174K
- more trees needed
- 0
Measured across a 2 km radius around Kamiunorei, Yamaguchi, 753-0091, Japan (12.57 km²), from a satellite image of Sep 17, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Yamaguchi · AQI 31 (Good)
Yamaguchi's tree count comes to 173,730 trees across 12.57 km², already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Yamaguchi today: AQI 31, Good
Main pollutant: PM2.5 · Observed Nov 12, 01:00 local time via OpenAQ and World Air Quality Index Project ground stations, US EPA index. Values in µg/m³.
Ground station · Yamaguchi, Yamaguchi, Japan (環境保健センター山口市), 800 m away · median of 2 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
5.5
PM10
9.7
NO₂
—
O₃
—
SO₂
0.0
CO
—
Data: OpenAQ · Ministry of the Environment Air Pollutant Wide Area Monitoring System, World Air Quality Index Project, Japan Atmospheric Environmental Regional Observation System (環境省大気汚染物質広域監視システム)
- Outdoor exercise
- A good day to be active outside
- Windows
- Open them to air the house
- Mask
- Not needed
- Air purifier
- Not needed
Over the last 7 days, the CAMS air-quality model put Yamaguchi's daily AQI at 33 on average, from 17 on Nov 10 to an hourly peak of 74 on Nov 6.
Where Yamaguchi stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Yamaguchi: Healthy tree cover
55.3% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
173,730
Target trees
173,730
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Yamaguchi lost?
Since 2001, the area within 10 km of Yamaguchi has lost about 862 hectares of forest (about 1,200 football pitches): 3.6% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 126 hectares (15%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from August 2017 of a 5 × 5 km area about 6 km west of the city center.
- Forest lost since 2001
- 862 haabout 1,200 football pitches
- Share of its forest
- 3.6%of what there was in 2000
- Cleared for good
- 126 hadeforestation: turned into farms, mines or towns
The worst year was 2022, when about 56 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 | 3 ha | 25 ha | 28 ha |
| 2002 | 8 ha | 38 ha | 46 ha |
| 2003 | 4 ha | 24 ha | 28 ha |
| 2004 | 16 ha | 25 ha | 42 ha |
| 2005 | 9 ha | 38 ha | 47 ha |
| 2006 | 11 ha | 21 ha | 32 ha |
| 2007 | 5 ha | 26 ha | 31 ha |
| 2008 | 3 ha | 36 ha | 39 ha |
| 2009 | 10 ha | 40 ha | 50 ha |
| 2010 | 11 ha | 38 ha | 49 ha |
| 2011 | 4 ha | 26 ha | 29 ha |
| 2012 | 3 ha | 14 ha | 17 ha |
| 2013 | 2 ha | 15 ha | 18 ha |
| 2014 | 2 ha | 18 ha | 20 ha |
| 2015 | 3 ha | 35 ha | 38 ha |
| 2016 | 2 ha | 34 ha | 36 ha |
| 2017 | 2 ha | 29 ha | 31 ha |
| 2018 | 2 ha | 25 ha | 27 ha |
| 2019 | under 1 ha | 35 ha | 35 ha |
| 2020 | 18 ha | 26 ha | 44 ha |
| 2021 | 7 ha | 29 ha | 36 ha |
| 2022 | 1 ha | 55 ha | 56 ha |
| 2023 | under 1 ha | 26 ha | 26 ha |
| 2024 | 1 ha | 28 ha | 30 ha |
| 2025 | under 1 ha | 29 ha | 29 ha |
What is causing deforestation around Yamaguchi?
- Loggingcan grow back83% · 717 ha
- Towns and roadscleared for good9.1% · 79 ha
- Mining and energycleared for good5.4% · 47 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
- 25,000 ha
- Forest in 2020
- 25,000 ha
- Overall change
- −6 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Yamaguchi stayed about the same size, at about 25,000 hectares: new forest grew on about 99 hectares, and about 106 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 Yamaguchi
Same 2 km radius, same index — so they compare directly.
- Hōfu17.4 km
Japan
- Tree cover
- 7%
- Air quality
- 33
- Ube33.3 km
Japan
- Tree cover
- 5%
- Air quality
- 22
- Shūnan34.4 km
Japan
- Tree cover
- 13%
- Air quality
- 45
- Shimonoseki55.0 km
Japan
- Tree cover
- 22%
- Air quality
- 40
- Kitakyushu67.7 km
Japan
- Tree cover
- 59%
- Air quality
- 43
- Iwakuni69.3 km
Japan
- Tree cover
- 17%
- Air quality
- 18
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Frequently asked
Questions about Yamaguchi
What is the air quality (AQI) in Yamaguchi right now?
The latest reading for Yamaguchi shows an AQI of 31 (Good), measured Nov 12, 01:00 local time by 2 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Yamaguchi, Yamaguchi, Japan (環境保健センター山口市), 800 m away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Yamaguchi today?
At AQI 31 (Good): a good day to be active outside. Windows: open them to air the house. Masks: not needed. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Yamaguchi been like this week?
Over the last 7 days, the CAMS air-quality model put Yamaguchi's daily AQI at 33 on average, from 17 on Nov 10 to an hourly peak of 74 on Nov 6. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Yamaguchi lost since 2001?
Since 2001, the area within 10 km of Yamaguchi has lost about 862 hectares of forest (about 1,200 football pitches): 3.6% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 126 hectares (15%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Yamaguchi stayed about the same size, at about 25,000 hectares: new forest grew on about 99 hectares, and about 106 hectares were lost.
What is the tree count in Yamaguchi?
Yamaguchi has an estimated 173,730 trees across the 12.57 km² measured — 55.3% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Yamaguchi need?
Yamaguchi has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Yamaguchi's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Kamiunorei, 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 Kamiunorei; the tree count is an estimate derived from that cover.
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