City report · Yamaguchi, Japan
Shimonoseki Air quality today
Air quality in Shimonoseki currently reads AQI 28 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 28
Good
- PM2.5, fine particles (µg/m³)
- 4.3
- tree cover
- 22.3%
- trees in this area
- 42.6K
- more trees needed
- 14.7K
Measured across a 2 km radius around 1 Chome-6 Maruyamacho, Shimonoseki, Yamaguchi 750-0019, Japan (12.57 km²), from a satellite image of Sep 17, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Shimonoseki · AQI 28 (Good)
Shimonoseki's tree count comes to 42,595 trees across 7.64 km² of land, 8 points below the 30% tree-cover level considered healthy for this area, so roughly 14,708 more trees would close the gap.
Air quality detail
Air quality in Shimonoseki today: AQI 28, Good
Main pollutant: PM2.5 · Observed Nov 11, 11:00 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. Fukuoka and Kasuga
Health signal
Air quality is satisfactory for everyone.
PM2.5
4.3
PM10
17.6
NO₂
14.9
O₃
57.0
SO₂
11.0
CO
142.0
- 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 Shimonoseki's daily AQI at 43 on average, from 27 on Nov 10 to an hourly peak of 74 on Nov 6.
Where Shimonoseki stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Shimonoseki: Below target
22.3% tree cover against a 30% healthy-neighborhood target, across 7.64 km² of land.
Trees in this area
42,595
Target trees
57,303
More trees needed
14,708
CO₂ if planted / yr
323.6 t
Deforestation · 2001–2025
How much forest has Shimonoseki lost?
Since 2001, the area within 10 km of Shimonoseki has lost about 91 hectares of forest (about 130 football pitches): 1.3% of the forest it had in 2000. Most of it (67%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from August 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 91 haabout 130 football pitches
- Share of its forest
- 1.3%of what there was in 2000
- Cleared for good
- 61 hadeforestation: turned into farms, mines or towns
The worst year was 2009, when about 11 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 | 5 ha | 2 ha | 6 ha |
| 2002 | 9 ha | 1 ha | 10 ha |
| 2003 | 4 ha | under 1 ha | 4 ha |
| 2004 | 7 ha | under 1 ha | 8 ha |
| 2005 | 3 ha | 1 ha | 4 ha |
| 2006 | 3 ha | under 1 ha | 4 ha |
| 2007 | 2 ha | 3 ha | 5 ha |
| 2008 | 2 ha | 3 ha | 5 ha |
| 2009 | 5 ha | 7 ha | 11 ha |
| 2010 | 2 ha | 1 ha | 3 ha |
| 2011 | under 1 ha | under 1 ha | 1 ha |
| 2012 | 2 ha | under 1 ha | 2 ha |
| 2013 | 1 ha | 4 ha | 5 ha |
| 2014 | under 1 ha | under 1 ha | under 1 ha |
| 2015 | 2 ha | under 1 ha | 2 ha |
| 2016 | 2 ha | under 1 ha | 2 ha |
| 2017 | under 1 ha | under 1 ha | 1 ha |
| 2018 | 4 ha | 1 ha | 5 ha |
| 2019 | 2 ha | under 1 ha | 2 ha |
| 2020 | under 1 ha | under 1 ha | under 1 ha |
| 2021 | 2 ha | under 1 ha | 2 ha |
| 2022 | under 1 ha | under 1 ha | 1 ha |
| 2023 | 3 ha | under 1 ha | 4 ha |
| 2024 | 1 ha | under 1 ha | 2 ha |
| 2025 | under 1 ha | under 1 ha | 1 ha |
What is causing deforestation around Shimonoseki?
- Towns and roadscleared for good68% · 61 ha
- Loggingcan grow back18% · 16 ha
- Unknown causescause unknown15% · 13 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
- 7,650 ha
- Forest in 2020
- 7,630 ha
- Overall change
- −19 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Shimonoseki stayed about the same size, at about 7,630 hectares: new forest grew on about 52 hectares, and about 71 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 Shimonoseki
What is the air quality (AQI) in Shimonoseki right now?
The latest reading for Shimonoseki shows an AQI of 28 (Good), observed Nov 11, 11:00 local time via Open-Meteo / CAMS, corrected with 7 ground-station cities within 245 km, US EPA index. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Shimonoseki today?
At AQI 28 (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 Shimonoseki been like this week?
Over the last 7 days, the CAMS air-quality model put Shimonoseki's daily AQI at 43 on average, from 27 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 Shimonoseki lost since 2001?
Since 2001, the area within 10 km of Shimonoseki has lost about 91 hectares of forest (about 130 football pitches): 1.3% of the forest it had in 2000. Most of it (67%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Shimonoseki stayed about the same size, at about 7,630 hectares: new forest grew on about 52 hectares, and about 71 hectares were lost.
What is the tree count in Shimonoseki?
Shimonoseki has an estimated 42,595 trees across the 7.64 km² of land measured — 22.3% tree cover, 8 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Shimonoseki need?
Shimonoseki needs roughly 14,708 more trees to close a 8-point shortfall against its 30% tree-cover target — about 323.6 t of extra CO₂ absorbed per year once grown.
How are Shimonoseki'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 1 Chome-6 Maruyamacho; the tree count is an estimate derived from that cover.
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