City report · Nagasaki, Japan
Sasebo Air quality today
Air quality in Sasebo currently reads AQI 36 (Good): Air quality is satisfactory for everyone.
AQI 36
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 6.5
- tree cover
- 32.5%
- trees in this area
- 84.0K
- more trees needed
- 0
Measured across a 2 km radius around 6 Tonoocho, Sasebo, Nagasaki 857-0864, Japan (12.57 km²), from a satellite image of Sep 22, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Sasebo · AQI 36 (Good)
Sasebo's tree count comes to 84,030 trees across 10.35 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Sasebo today: AQI 36, 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 · Sasebo (佐世保), 1.6 km away · median of 4 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
6.5
PM10
10.8
NO₂
16.9
O₃
—
SO₂
0.0
CO
343.7
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 Sasebo's daily AQI at 37 on average, from 19 on Nov 7 to an hourly peak of 83 on Nov 6.
Where Sasebo stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Sasebo: Healthy tree cover
32.5% tree cover against a 30% healthy-neighborhood target, across 10.35 km² of land.
Trees in this area
84,030
Target trees
84,030
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Sasebo lost?
Since 2001, the area within 10 km of Sasebo has lost about 446 hectares of forest (about 620 football pitches): 3.1% of the forest it had in 2000. Most of it (57%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from August 2017 of a 5 × 5 km area about 6 km southeast of the city center.
- Forest lost since 2001
- 446 haabout 620 football pitches
- Share of its forest
- 3.1%of what there was in 2000
- Cleared for good
- 252 hadeforestation: turned into farms, mines or towns
The worst year was 2018, when about 34 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 | 14 ha | 7 ha | 20 ha |
| 2002 | 7 ha | 5 ha | 12 ha |
| 2003 | 6 ha | 2 ha | 8 ha |
| 2004 | 19 ha | 6 ha | 25 ha |
| 2005 | 13 ha | 12 ha | 25 ha |
| 2006 | 12 ha | 11 ha | 23 ha |
| 2007 | 13 ha | 9 ha | 22 ha |
| 2008 | 11 ha | 15 ha | 26 ha |
| 2009 | 16 ha | 13 ha | 29 ha |
| 2010 | 9 ha | 7 ha | 16 ha |
| 2011 | 13 ha | 2 ha | 15 ha |
| 2012 | 11 ha | 11 ha | 22 ha |
| 2013 | 2 ha | 2 ha | 4 ha |
| 2014 | 2 ha | 4 ha | 6 ha |
| 2015 | 8 ha | 5 ha | 13 ha |
| 2016 | 12 ha | 7 ha | 18 ha |
| 2017 | 5 ha | 6 ha | 11 ha |
| 2018 | 29 ha | 5 ha | 34 ha |
| 2019 | 18 ha | 13 ha | 31 ha |
| 2020 | 9 ha | 2 ha | 10 ha |
| 2021 | 5 ha | 10 ha | 15 ha |
| 2022 | 5 ha | 17 ha | 22 ha |
| 2023 | 9 ha | 7 ha | 16 ha |
| 2024 | 5 ha | 12 ha | 17 ha |
| 2025 | 3 ha | 4 ha | 7 ha |
What is causing deforestation around Sasebo?
- Towns and roadscleared for good53% · 234 ha
- Loggingcan grow back39% · 173 ha
- Mining and energycleared for good3.5% · 15 ha
Also: farms, pasture and plantations, 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
- 16,000 ha
- Forest in 2020
- 15,900 ha
- Overall change
- −101 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Sasebo stayed about the same size, at about 15,900 hectares: new forest grew on about 106 hectares, and about 206 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 Sasebo
What is the air quality (AQI) in Sasebo right now?
The latest reading for Sasebo shows an AQI of 36 (Good), measured Nov 12, 01:00 local time by 4 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Sasebo (佐世保), 1.6 km away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Sasebo today?
At AQI 36 (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 Sasebo been like this week?
Over the last 7 days, the CAMS air-quality model put Sasebo's daily AQI at 37 on average, from 19 on Nov 7 to an hourly peak of 83 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 Sasebo lost since 2001?
Since 2001, the area within 10 km of Sasebo has lost about 446 hectares of forest (about 620 football pitches): 3.1% of the forest it had in 2000. Most of it (57%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Sasebo stayed about the same size, at about 15,900 hectares: new forest grew on about 106 hectares, and about 206 hectares were lost.
What is the tree count in Sasebo?
Sasebo has an estimated 84,030 trees across the 10.35 km² of land measured — 32.5% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Sasebo need?
Sasebo has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Sasebo's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near 6 Tonoocho, 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 6 Tonoocho; the tree count is an estimate derived from that cover.
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