City report · Nagasaki, Japan
Nagasaki Air quality today
Air quality in Nagasaki currently reads AQI 14 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 14
Good
- PM2.5, fine particles (µg/m³)
- 2.1
- tree cover
- 45.5%
- trees in this area
- 134K
- more trees needed
- 0
Measured across a 2 km radius around 4 Yahatamachi, Nagasaki, 850-0801, Japan (12.57 km²), from a satellite image of Sep 25, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Nagasaki · AQI 14 (Good)
Nagasaki's tree count comes to 133,794 trees across 11.77 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Nagasaki today: AQI 14, Good
Main pollutant: PM2.5 · Observed Nov 11, 10:00 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. Kasuga and Fukuoka
Health signal
Air quality is satisfactory for everyone.
PM2.5
2.1
PM10
11.6
NO₂
8.0
O₃
67.0
SO₂
6.5
CO
197.0
- 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 Nagasaki's daily AQI at 40 on average, from 19 on Nov 10 to an hourly peak of 77 on Nov 6.
Where Nagasaki stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Nagasaki: Healthy tree cover
45.5% tree cover against a 30% healthy-neighborhood target, across 11.77 km² of land.
Trees in this area
133,794
Target trees
133,794
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Nagasaki lost?
Since 2001, the area within 10 km of Nagasaki has lost about 198 hectares of forest (about 280 football pitches): 1.4% of the forest it had in 2000. Most of it (81%) 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
- 198 haabout 280 football pitches
- Share of its forest
- 1.4%of what there was in 2000
- Cleared for good
- 161 hadeforestation: turned into farms, mines or towns
The worst year was 2001, when about 21 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 | 18 ha | 3 ha | 21 ha |
| 2002 | 7 ha | 1 ha | 8 ha |
| 2003 | 2 ha | 2 ha | 4 ha |
| 2004 | 2 ha | 5 ha | 7 ha |
| 2005 | 6 ha | 4 ha | 10 ha |
| 2006 | 17 ha | 1 ha | 18 ha |
| 2007 | 7 ha | 3 ha | 10 ha |
| 2008 | 15 ha | 1 ha | 16 ha |
| 2009 | 11 ha | 2 ha | 13 ha |
| 2010 | 4 ha | 1 ha | 5 ha |
| 2011 | 4 ha | 2 ha | 7 ha |
| 2012 | 8 ha | 2 ha | 10 ha |
| 2013 | 11 ha | under 1 ha | 11 ha |
| 2014 | 1 ha | 1 ha | 2 ha |
| 2015 | 2 ha | under 1 ha | 3 ha |
| 2016 | 8 ha | under 1 ha | 9 ha |
| 2017 | 5 ha | under 1 ha | 5 ha |
| 2018 | 4 ha | under 1 ha | 5 ha |
| 2019 | 2 ha | under 1 ha | 2 ha |
| 2020 | 2 ha | 1 ha | 4 ha |
| 2021 | 9 ha | under 1 ha | 9 ha |
| 2022 | 4 ha | 3 ha | 7 ha |
| 2023 | 7 ha | 1 ha | 8 ha |
| 2024 | 2 ha | under 1 ha | 2 ha |
| 2025 | under 1 ha | 1 ha | 2 ha |
What is causing deforestation around Nagasaki?
- Towns and roadscleared for good81% · 160 ha
- Loggingcan grow back9.7% · 19 ha
- Unknown causescause unknown9% · 18 ha
Also: farms, pasture and plantations.
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
- 16,100 ha
- Forest in 2020
- 16,100 ha
- Overall change
- −35 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Nagasaki stayed about the same size, at about 16,100 hectares: new forest grew on about 103 hectares, and about 139 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 Nagasaki
What is the air quality (AQI) in Nagasaki right now?
The latest reading for Nagasaki shows an AQI of 14 (Good), observed Nov 11, 10:00 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 Nagasaki today?
At AQI 14 (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 Nagasaki been like this week?
Over the last 7 days, the CAMS air-quality model put Nagasaki's daily AQI at 40 on average, from 19 on Nov 10 to an hourly peak of 77 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 Nagasaki lost since 2001?
Since 2001, the area within 10 km of Nagasaki has lost about 198 hectares of forest (about 280 football pitches): 1.4% of the forest it had in 2000. Most of it (81%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Nagasaki stayed about the same size, at about 16,100 hectares: new forest grew on about 103 hectares, and about 139 hectares were lost.
What is the tree count in Nagasaki?
Nagasaki has an estimated 133,794 trees across the 11.77 km² of land measured — 45.5% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Nagasaki need?
Nagasaki has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Nagasaki'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 4 Yahatamachi; the tree count is an estimate derived from that cover.
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