City report · Nagano, Japan
Nagano Air quality today
Air quality in Nagano currently reads AQI 22 (Good): Air quality is satisfactory for everyone.
AQI 22
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 4.0
- tree cover
- 25.5%
- trees in this area
- 80.1K
- more trees needed
- 14.1K
Measured across a 2 km radius around Minamiagatamachi Minaminagano, Nagano, 380-0836, Japan (12.57 km²), from a satellite image of Sep 1, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Nagano · AQI 22 (Good)
Nagano's tree count comes to 80,111 trees across 12.57 km², 4 points below the 30% tree-cover level considered healthy for this area, so roughly 14,137 more trees would close the gap.
Air quality detail
Air quality in Nagano today: AQI 22, 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 · Nagano (長野), 1 km away · median of 5 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
4.0
PM10
5.4
NO₂
9.4
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 Nagano's daily AQI at 24 on average, from 13 on Nov 7 to an hourly peak of 63 on Nov 6.
Where Nagano stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Nagano: Below target
25.5% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
80,111
Target trees
94,248
More trees needed
14,137
CO₂ if planted / yr
311.0 t
Deforestation · 2001–2025
How much forest has Nagano lost?
Since 2001, the area within 10 km of Nagano has lost about 236 hectares of forest (about 330 football pitches): 1.8% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 30 hectares (13%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from July 2017 of a 5 × 5 km area about 7 km north of the city center.
- Forest lost since 2001
- 236 haabout 330 football pitches
- Share of its forest
- 1.8%of what there was in 2000
- Cleared for good
- 30 hadeforestation: turned into farms, mines or towns
The worst year was 2019, when about 22 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 | 7 ha | 8 ha |
| 2002 | under 1 ha | 6 ha | 6 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | under 1 ha | 5 ha | 6 ha |
| 2005 | under 1 ha | 5 ha | 5 ha |
| 2006 | under 1 ha | 5 ha | 5 ha |
| 2007 | under 1 ha | 6 ha | 7 ha |
| 2008 | under 1 ha | 5 ha | 6 ha |
| 2009 | under 1 ha | 2 ha | 3 ha |
| 2010 | 2 ha | 7 ha | 9 ha |
| 2011 | 2 ha | 3 ha | 5 ha |
| 2012 | under 1 ha | 6 ha | 7 ha |
| 2013 | under 1 ha | 3 ha | 3 ha |
| 2014 | under 1 ha | 3 ha | 4 ha |
| 2015 | under 1 ha | 6 ha | 6 ha |
| 2016 | 2 ha | 12 ha | 14 ha |
| 2017 | under 1 ha | 14 ha | 14 ha |
| 2018 | 1 ha | 15 ha | 16 ha |
| 2019 | 2 ha | 20 ha | 22 ha |
| 2020 | 2 ha | 19 ha | 21 ha |
| 2021 | 1 ha | 7 ha | 8 ha |
| 2022 | 3 ha | 15 ha | 18 ha |
| 2023 | under 1 ha | 16 ha | 16 ha |
| 2024 | under 1 ha | 9 ha | 9 ha |
| 2025 | 9 ha | 11 ha | 20 ha |
What is causing deforestation around Nagano?
- Loggingcan grow back81% · 192 ha
- Towns and roadscleared for good8.5% · 20 ha
- Farms, pasture and plantationscleared for good3.3% · 8 ha
Also: mining and energy, 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.
Forest gained and lost, 2000–2020
- Forest in 2000
- 13,500 ha
- Forest in 2020
- 13,500 ha
- Overall change
- −11 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Nagano stayed about the same size, at about 13,500 hectares: new forest grew on about 135 hectares, and about 147 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 Nagano
What is the air quality (AQI) in Nagano right now?
The latest reading for Nagano shows an AQI of 22 (Good), measured Nov 12, 01:00 local time by 5 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Nagano (長野), 1 km away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Nagano today?
At AQI 22 (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 Nagano been like this week?
Over the last 7 days, the CAMS air-quality model put Nagano's daily AQI at 24 on average, from 13 on Nov 7 to an hourly peak of 63 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 Nagano lost since 2001?
Since 2001, the area within 10 km of Nagano has lost about 236 hectares of forest (about 330 football pitches): 1.8% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 30 hectares (13%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Nagano stayed about the same size, at about 13,500 hectares: new forest grew on about 135 hectares, and about 147 hectares were lost.
What is the tree count in Nagano?
Nagano has an estimated 80,111 trees across the 12.57 km² measured — 25.5% tree cover, 4 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Nagano need?
Nagano needs roughly 14,137 more trees to close a 4-point shortfall against its 30% tree-cover target — about 311.0 t of extra CO₂ absorbed per year once grown.
How are Nagano's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Minamiagatamachi Minaminagano, 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 Minamiagatamachi Minaminagano; the tree count is an estimate derived from that cover.
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