Japan · Nagano · 4 cities
Air quality in Nagano today The AQI right now, city by city
Right now, Iida has the cleanest air of the 4 cities we track in Nagano (AQI 9, Good), and Matsumoto the worst (AQI 23, Good). Nagano has the most tree cover, at 25.5% — #44 of 207 cities measured in Japan.
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.
AQI 18
Average right now
Good
- cities tracked
- 4
- average tree cover
- 17.4%
- Japan: 16.4%
- worst air now: Matsumoto
- 23
- cleanest air now: Iida
- 9
Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf, refreshed hourly.
Nagano · average AQI 18
Air quality today across Nagano, city by city
| Nagano | 22Good | 25.5% | 14.1K | #44 of 207 |
|---|---|---|---|---|
| Matsumoto | 23Good | 6.2% | 74.6K | #158 of 207 |
| Ueda | 17Good | 18.1% | 37.4K | #66 of 207 |
| Iida | 9Good | 20.0% | 31.4K | #53 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 Nagano lost?
Since 2001, Nagano has lost about 15,900 hectares of forest (about 22,000 football pitches): 1.5% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 1,570 hectares (9.9%) was deforestation: forest cleared for good for farms, mines or towns.
- Forest lost since 2001
- 15,900 haabout 22,000 football pitches
- Share of its forest
- 1.5%of what there was in 2000
- Cleared for good
- 1,570 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 | 34 ha | 309 ha | 343 ha |
| 2002 | 44 ha | 301 ha | 345 ha |
| 2003 | 19 ha | 100 ha | 119 ha |
| 2004 | 51 ha | 277 ha | 328 ha |
| 2005 | 85 ha | 377 ha | 462 ha |
| 2006 | 39 ha | 267 ha | 306 ha |
| 2007 | 110 ha | 458 ha | 568 ha |
| 2008 | 63 ha | 332 ha | 395 ha |
| 2009 | 71 ha | 463 ha | 534 ha |
| 2010 | 111 ha | 475 ha | 586 ha |
| 2011 | 66 ha | 322 ha | 388 ha |
| 2012 | 57 ha | 359 ha | 415 ha |
| 2013 | 24 ha | 179 ha | 203 ha |
| 2014 | 31 ha | 321 ha | 352 ha |
| 2015 | 24 ha | 234 ha | 258 ha |
| 2016 | 70 ha | 849 ha | 919 ha |
| 2017 | 89 ha | 637 ha | 726 ha |
| 2018 | 70 ha | 827 ha | 897 ha |
| 2019 | 76 ha | 895 ha | 971 ha |
| 2020 | 109 ha | 1,030 ha | 1,140 ha |
| 2021 | 62 ha | 751 ha | 813 ha |
| 2022 | 66 ha | 1,040 ha | 1,110 ha |
| 2023 | 52 ha | 1,060 ha | 1,110 ha |
| 2024 | 56 ha | 1,200 ha | 1,260 ha |
| 2025 | 92 ha | 1,290 ha | 1,380 ha |
Forest loss has stayed about the same: about 1,130 hectares a year in 2021–2025, against 931 hectares a year in 2016–2020. The worst year was 2025, when about 1,380 hectares of forest were lost.
What is causing deforestation in Nagano?
- Loggingcan grow back82% · 13,000 ha
- Towns and roadscleared for good6.9% · 1,100 ha
- Mining and energycleared for good2.1% · 340 ha
Also: storms, floods and other natural causes, farms, pasture and plantations, wildfires, 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
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