Japan · Nagasaki · 3 cities
Air quality in Nagasaki today The AQI right now, city by city
Air quality and tree cover for 3 cities in Nagasaki, Japan, measured from satellite imagery and live air-quality data.
Every city is measured the same way, over the same 2 km around its center: the air quality right now, from ground stations where there are any, and its tree cover.
Average right now
AQI 13
Good
- cities tracked
- 3
- average tree cover
- 36.4%
- Japan: 16.4%
Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf, refreshed hourly.
Nagasaki · average AQI 13
Air quality today across Nagasaki, city by city
| Nagasaki | 14Good | 45.5% | — | #12 of 207 |
|---|---|---|---|---|
| Sasebo | 13Good | 32.5% | — | #28 of 207 |
| Isahaya | 12Good | 31.3% | — | #35 of 207 |
Air quality is the US AQI from ground monitoring stations via OpenAQ where available, otherwise the Open-Meteo / CAMS model, refreshed hourly. Tree cover is measured within 2 km of each city center from Sentinel-2 imagery; the rank compares every city measured in Japan.
Deforestation · 2001–2025
How much forest has Nagasaki lost?
Since 2001, Nagasaki has lost about 5,630 hectares of forest (about 7,900 football pitches): 2.2% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 2,010 hectares (36%) was deforestation: forest cleared for good for farms, mines or towns.
- Forest lost since 2001
- 5,630 haabout 7,900 football pitches
- Share of its forest
- 2.2%of what there was in 2000
- Cleared for good
- 2,010 hadeforestation: turned into farms, mines or towns
Hectares of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | 112 ha | 78 ha | 190 ha |
| 2002 | 62 ha | 60 ha | 121 ha |
| 2003 | 55 ha | 63 ha | 118 ha |
| 2004 | 91 ha | 96 ha | 187 ha |
| 2005 | 82 ha | 117 ha | 199 ha |
| 2006 | 103 ha | 144 ha | 247 ha |
| 2007 | 80 ha | 163 ha | 242 ha |
| 2008 | 95 ha | 118 ha | 213 ha |
| 2009 | 74 ha | 102 ha | 175 ha |
| 2010 | 59 ha | 126 ha | 185 ha |
| 2011 | 70 ha | 126 ha | 196 ha |
| 2012 | 106 ha | 145 ha | 251 ha |
| 2013 | 40 ha | 71 ha | 111 ha |
| 2014 | 34 ha | 70 ha | 104 ha |
| 2015 | 63 ha | 101 ha | 164 ha |
| 2016 | 101 ha | 178 ha | 279 ha |
| 2017 | 137 ha | 137 ha | 274 ha |
| 2018 | 129 ha | 162 ha | 291 ha |
| 2019 | 115 ha | 221 ha | 336 ha |
| 2020 | 74 ha | 164 ha | 238 ha |
| 2021 | 80 ha | 206 ha | 286 ha |
| 2022 | 71 ha | 234 ha | 305 ha |
| 2023 | 76 ha | 230 ha | 306 ha |
| 2024 | 46 ha | 242 ha | 288 ha |
| 2025 | 57 ha | 267 ha | 324 ha |
Forest loss has stayed about the same: about 302 hectares a year in 2021–2025, against 284 hectares a year in 2016–2020. The worst year was 2019, when about 336 hectares of forest were lost.
What is causing deforestation in Nagasaki?
- Loggingcan grow back58% · 3,280 ha
- Towns and roadscleared for good29% · 1,630 ha
- Mining and energycleared for good3.9% · 222 ha
Also: farms, pasture and plantations, storms, floods and other natural causes, unknown causes.
Causes for 2025 are estimates, based on what caused forest loss in the same places up to 2024.
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. How it's measured
Other prefectures in Japan
Clean-air buying guides
Cleaner air at home in Nagasaki
Picked by tested clean-air delivery rate (CADR), noise and running cost, from independent test labels. No brand pays to be listed.
- The best air purifiers for wildfire smoke and smog
Air purifiers that keep up with wildfire smoke and winter smog, ranked by verified smoke CADR, with the room each one clears on a smoky day.
- The best air purifiers for bedrooms: quiet picks sized for your room
Quiet HEPA air purifiers for bedrooms, compared on what matters at night: noise on the lowest setting (from 20 dB), verified room size and filter cost.
- The best air purifiers under $200
Good HEPA air purifiers under $200 at the makers' own prices, compared on verified clean air, room size and what the filters cost each year.
Your own street