City report · Yamaguchi, Japan
Hōfu Air quality today
Air quality in Hōfu currently reads AQI 12 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 12
Good
- PM2.5, fine particles (µg/m³)
- 2.4
- tree cover
- 7.1%
- trees in this area
- 22.3K
- more trees needed
- 71.9K
Measured across a 2 km radius around 12 Ekiminamimachi, Hofu, Yamaguchi 747-0801, Japan (12.57 km²), from a satellite image of Sep 17, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Hōfu · AQI 12 (Good)
Hōfu's tree count comes to 22,283 trees across 12.56 km² of land, 23 points below the 30% tree-cover level considered healthy for this area, so roughly 71,871 more trees would close the gap.
Air quality detail
Air quality in Hōfu today: AQI 12, Good
Main pollutant: PM2.5 · Observed Nov 11, 12:00 local time via Open-Meteo / CAMS, corrected with 2 ground-station cities within 125 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 2 station cities within 125 km, e.g. Fukuoka and Kasuga
Health signal
Air quality is satisfactory for everyone.
PM2.5
2.4
PM10
13.6
NO₂
8.6
O₃
77.0
SO₂
8.5
CO
133.0
- 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 Hōfu's daily AQI at 33 on average, from 17 on Nov 10 to an hourly peak of 74 on Nov 6.
Where Hōfu stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Hōfu: Critically low
7.1% tree cover against a 30% healthy-neighborhood target, across 12.56 km² of land.
Trees in this area
22,283
Target trees
94,154
More trees needed
71,871
CO₂ if planted / yr
1,581 t
Deforestation · 2001–2025
How much forest has Hōfu lost?
Since 2001, the area within 10 km of Hōfu has lost about 371 hectares of forest (about 520 football pitches): 3% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 146 hectares (39%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from August 2017 of a 5 × 5 km area about 7 km north of the city center.
- Forest lost since 2001
- 371 haabout 520 football pitches
- Share of its forest
- 3%of what there was in 2000
- Cleared for good
- 146 hadeforestation: turned into farms, mines or towns
The worst year was 2009, when about 119 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 | 2 ha | 3 ha | 5 ha |
| 2002 | 6 ha | 10 ha | 17 ha |
| 2003 | 1 ha | 17 ha | 18 ha |
| 2004 | 1 ha | 15 ha | 16 ha |
| 2005 | under 1 ha | 6 ha | 6 ha |
| 2006 | 9 ha | 3 ha | 12 ha |
| 2007 | 2 ha | under 1 ha | 3 ha |
| 2008 | 1 ha | 3 ha | 5 ha |
| 2009 | 44 ha | 75 ha | 119 ha |
| 2010 | 14 ha | 20 ha | 34 ha |
| 2011 | 1 ha | 12 ha | 13 ha |
| 2012 | 1 ha | 2 ha | 3 ha |
| 2013 | under 1 ha | 7 ha | 7 ha |
| 2014 | 1 ha | 2 ha | 3 ha |
| 2015 | under 1 ha | 3 ha | 3 ha |
| 2016 | 2 ha | 4 ha | 6 ha |
| 2017 | 4 ha | 8 ha | 11 ha |
| 2018 | 1 ha | 7 ha | 8 ha |
| 2019 | 3 ha | 9 ha | 11 ha |
| 2020 | 43 ha | 3 ha | 45 ha |
| 2021 | 2 ha | under 1 ha | 3 ha |
| 2022 | 4 ha | 5 ha | 10 ha |
| 2023 | 2 ha | 3 ha | 5 ha |
| 2024 | 1 ha | 5 ha | 6 ha |
| 2025 | under 1 ha | 2 ha | 2 ha |
What is causing deforestation around Hōfu?
- Loggingcan grow back58% · 214 ha
- Towns and roadscleared for good21% · 78 ha
- Mining and energycleared for good18% · 67 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
- 13,400 ha
- Forest in 2020
- 13,400 ha
- Overall change
- +12 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Hōfu stayed about the same size, at about 13,400 hectares: new forest grew on about 133 hectares, and about 122 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 Hōfu
Same 2 km radius, same index — so they compare directly.
- Yamaguchi17.4 km
Japan
- Tree cover
- 55%
- Air quality
- 12
- Shūnan22.1 km
Japan
- Tree cover
- 13%
- Air quality
- 11
- Ube31.4 km
Japan
- Tree cover
- 5%
- Air quality
- 13
- Shimonoseki59.0 km
Japan
- Tree cover
- 22%
- Air quality
- 28
- Iwakuni61.4 km
Japan
- Tree cover
- 17%
- Air quality
- 12
- Kitakyushu69.7 km
Japan
- Tree cover
- 59%
- Air quality
- 24
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Frequently asked
Questions about Hōfu
What is the air quality (AQI) in Hōfu right now?
The latest reading for Hōfu shows an AQI of 12 (Good), observed Nov 11, 12:00 local time via Open-Meteo / CAMS, corrected with 2 ground-station cities within 125 km, US EPA index. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Hōfu today?
At AQI 12 (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 Hōfu been like this week?
Over the last 7 days, the CAMS air-quality model put Hōfu'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 Hōfu lost since 2001?
Since 2001, the area within 10 km of Hōfu has lost about 371 hectares of forest (about 520 football pitches): 3% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 146 hectares (39%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Hōfu stayed about the same size, at about 13,400 hectares: new forest grew on about 133 hectares, and about 122 hectares were lost.
What is the tree count in Hōfu?
Hōfu has an estimated 22,283 trees across the 12.56 km² of land measured — 7.1% tree cover, 23 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Hōfu need?
Hōfu needs roughly 71,871 more trees to close a 23-point shortfall against its 30% tree-cover target — about 1,581 t of extra CO₂ absorbed per year once grown.
How are Hōfu'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 12 Ekiminamimachi; the tree count is an estimate derived from that cover.
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