City report · Yamaguchi, Japan
Ube Air quality today
Air quality in Ube currently reads AQI 22 (Good): Air quality is satisfactory for everyone.
AQI 22
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 4.6
- tree cover
- 4.5%
- trees in this area
- 11.4K
- more trees needed
- 64.7K
Measured across a 2 km radius around 2 Chome-9 Meijimachi, Ube, Yamaguchi 755-0013, Japan (12.57 km²), from a satellite image of Sep 17, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Ube · AQI 22 (Good)
Ube's tree count comes to 11,423 trees across 10.16 km² of land, 26 points below the 30% tree-cover level considered healthy for this area, so roughly 64,729 more trees would close the gap.
Air quality detail
Air quality in Ube today: AQI 22, Good
Main pollutant: PM2.5 · Observed Nov 11, 07:00 local time via Open-Meteo / CAMS, corrected with 2 ground-station cities within 245 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 2 station cities within 245 km, e.g. Imabari and Junggu-ro 44beon-gil, Jung-gu, Busan, South Korea
Health signal
Air quality is satisfactory for everyone.
PM2.5
4.6
PM10
14.3
NO₂
25.1
O₃
42.0
SO₂
11.1
CO
123.0
- 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 Ube's daily AQI at 36 on average, from 20 on Nov 10 to an hourly peak of 75 on Nov 6.
Where Ube stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Ube: Critically low
4.5% tree cover against a 30% healthy-neighborhood target, across 10.16 km² of land.
Trees in this area
11,423
Target trees
76,152
More trees needed
64,729
CO₂ if planted / yr
1,424 t
Deforestation · 2001–2025
How much forest has Ube lost?
Since 2001, the area within 10 km of Ube has lost about 63 hectares of forest (about 88 football pitches): 1.4% of the forest it had in 2000. Most of it (69%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from July 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 63 haabout 88 football pitches
- Share of its forest
- 1.4%of what there was in 2000
- Cleared for good
- 43 hadeforestation: turned into farms, mines or towns
The worst year was 2005, when about 8 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 | 4 ha | 1 ha | 5 ha |
| 2002 | 2 ha | under 1 ha | 2 ha |
| 2003 | 1 ha | under 1 ha | 2 ha |
| 2004 | 2 ha | 2 ha | 4 ha |
| 2005 | 2 ha | 5 ha | 8 ha |
| 2006 | 3 ha | 1 ha | 4 ha |
| 2007 | 2 ha | under 1 ha | 2 ha |
| 2008 | under 1 ha | 1 ha | 2 ha |
| 2009 | 3 ha | under 1 ha | 4 ha |
| 2010 | 2 ha | 2 ha | 5 ha |
| 2011 | 2 ha | under 1 ha | 2 ha |
| 2012 | 2 ha | 1 ha | 3 ha |
| 2013 | 3 ha | under 1 ha | 3 ha |
| 2014 | under 1 ha | under 1 ha | under 1 ha |
| 2015 | 3 ha | under 1 ha | 3 ha |
| 2016 | 4 ha | under 1 ha | 4 ha |
| 2017 | 3 ha | under 1 ha | 3 ha |
| 2018 | 2 ha | under 1 ha | 2 ha |
| 2019 | under 1 ha | under 1 ha | under 1 ha |
| 2020 | under 1 ha | under 1 ha | under 1 ha |
| 2021 | under 1 ha | under 1 ha | under 1 ha |
| 2022 | under 1 ha | under 1 ha | under 1 ha |
| 2023 | 1 ha | under 1 ha | 1 ha |
| 2024 | under 1 ha | under 1 ha | under 1 ha |
| 2025 | 2 ha | under 1 ha | 2 ha |
What is causing deforestation around Ube?
- Towns and roadscleared for good68% · 43 ha
- Loggingcan grow back18% · 11 ha
- Farms, pasture and plantationscleared for good1.1% · under 1 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
- 5,380 ha
- Forest in 2020
- 5,460 ha
- Overall change
- +79 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Ube stayed about the same size, at about 5,460 hectares: new forest grew on about 147 hectares, and about 68 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 Ube
Same 2 km radius, same index — so they compare directly.
- Shimonoseki29.0 km
Japan
- Tree cover
- 22%
- Air quality
- 40
- Hōfu31.4 km
Japan
- Tree cover
- 7%
- Air quality
- 33
- Yamaguchi33.3 km
Japan
- Tree cover
- 55%
- Air quality
- 33
- Kitakyushu38.4 km
Japan
- Tree cover
- 59%
- Air quality
- 43
- Shūnan52.7 km
Japan
- Tree cover
- 13%
- Air quality
- 45
- Iizuka62.3 km
Japan
- Tree cover
- 18%
- Air quality
- 43
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Frequently asked
Questions about Ube
What is the air quality (AQI) in Ube right now?
The latest reading for Ube shows an AQI of 22 (Good), observed Nov 11, 07:00 local time via Open-Meteo / CAMS, corrected with 2 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 Ube today?
At AQI 22 (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 Ube been like this week?
Over the last 7 days, the CAMS air-quality model put Ube's daily AQI at 36 on average, from 20 on Nov 10 to an hourly peak of 75 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 Ube lost since 2001?
Since 2001, the area within 10 km of Ube has lost about 63 hectares of forest (about 88 football pitches): 1.4% of the forest it had in 2000. Most of it (69%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Ube stayed about the same size, at about 5,460 hectares: new forest grew on about 147 hectares, and about 68 hectares were lost.
What is the tree count in Ube?
Ube has an estimated 11,423 trees across the 10.16 km² of land measured — 4.5% tree cover, 26 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Ube need?
Ube needs roughly 64,729 more trees to close a 26-point shortfall against its 30% tree-cover target — about 1,424 t of extra CO₂ absorbed per year once grown.
How are Ube'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 2 Chome-9 Meijimachi; the tree count is an estimate derived from that cover.
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