City report · Nagano, Japan
Matsumoto Air quality today
Air quality in Matsumoto currently reads AQI 23 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 23
Good
- PM2.5, fine particles (µg/m³)
- 4.1
- tree cover
- 6.2%
- trees in this area
- 19.4K
- more trees needed
- 74.6K
Measured across a 2 km radius around 1 Chome-19 Central, Matsumoto, Nagano 390-0811, Japan (12.57 km²), from a satellite image of Sep 1, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Matsumoto · AQI 23 (Good)
Matsumoto's tree count comes to 19,439 trees across 12.54 km² of land, 24 points below the 30% tree-cover level considered healthy for this area, so roughly 74,620 more trees would close the gap.
Air quality detail
Air quality in Matsumoto today: AQI 23, Good
Main pollutant: PM2.5 · Observed Nov 11, 23:00 local time via World Air Quality Index Project ground stations, US EPA index. Values in µg/m³.
Ground station · Shinmeicho, Okaya, Nagano, Japan (岡谷インターチェンジ岡谷市), 18.7 km away
Health signal
Air quality is satisfactory for everyone.
PM2.5
4.1
PM10
8.6
NO₂
—
O₃
—
SO₂
—
CO
—
Data: 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 Matsumoto's daily AQI at 21 on average, from 7 on Nov 7 to an hourly peak of 69 on Nov 5.
Where Matsumoto stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Matsumoto: Critically low
6.2% tree cover against a 30% healthy-neighborhood target, across 12.54 km² of land.
Trees in this area
19,439
Target trees
94,059
More trees needed
74,620
CO₂ if planted / yr
1,642 t
Deforestation · 2001–2025
How much forest has Matsumoto lost?
Since 2001, the area within 10 km of Matsumoto has lost about 441 hectares of forest (about 620 football pitches): 3.7% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 2 hectares (under 1%) 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
- 441 haabout 620 football pitches
- Share of its forest
- 3.7%of what there was in 2000
- Cleared for good
- 2 hadeforestation: turned into farms, mines or towns
The worst year was 2020, when about 63 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 | under 1 ha | 2 ha | 2 ha |
| 2002 | under 1 ha | 53 ha | 53 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | under 1 ha | 7 ha | 7 ha |
| 2005 | under 1 ha | 3 ha | 3 ha |
| 2006 | under 1 ha | 3 ha | 3 ha |
| 2007 | under 1 ha | 3 ha | 3 ha |
| 2008 | under 1 ha | 5 ha | 5 ha |
| 2009 | under 1 ha | 5 ha | 5 ha |
| 2010 | under 1 ha | 6 ha | 6 ha |
| 2011 | under 1 ha | 4 ha | 4 ha |
| 2012 | under 1 ha | 7 ha | 7 ha |
| 2013 | under 1 ha | 5 ha | 5 ha |
| 2014 | under 1 ha | 4 ha | 4 ha |
| 2015 | under 1 ha | 8 ha | 8 ha |
| 2016 | under 1 ha | 21 ha | 21 ha |
| 2017 | under 1 ha | 23 ha | 23 ha |
| 2018 | under 1 ha | 59 ha | 59 ha |
| 2019 | under 1 ha | 25 ha | 25 ha |
| 2020 | under 1 ha | 63 ha | 63 ha |
| 2021 | under 1 ha | 32 ha | 32 ha |
| 2022 | under 1 ha | 33 ha | 33 ha |
| 2023 | under 1 ha | 22 ha | 22 ha |
| 2024 | under 1 ha | 31 ha | 31 ha |
| 2025 | under 1 ha | 15 ha | 15 ha |
What is causing deforestation around Matsumoto?
- Loggingcan grow back97% · 427 ha
- Unknown causescause unknown2.6% · 12 ha
Also: towns and roads.
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
- 12,100 ha
- Forest in 2020
- 12,000 ha
- Overall change
- −76 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Matsumoto stayed about the same size, at about 12,000 hectares: new forest grew on about 54 hectares, and about 129 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 Matsumoto
What is the air quality (AQI) in Matsumoto right now?
The latest reading for Matsumoto shows an AQI of 23 (Good), measured Nov 11, 23:00 local time by the Shinmeicho, Okaya, Nagano, Japan (岡谷インターチェンジ岡谷市) ground monitoring station, 18.7 km away, via OpenAQ. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Matsumoto today?
At AQI 23 (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 Matsumoto been like this week?
Over the last 7 days, the CAMS air-quality model put Matsumoto's daily AQI at 21 on average, from 7 on Nov 7 to an hourly peak of 69 on Nov 5. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Matsumoto lost since 2001?
Since 2001, the area within 10 km of Matsumoto has lost about 441 hectares of forest (about 620 football pitches): 3.7% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 2 hectares (under 1%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Matsumoto stayed about the same size, at about 12,000 hectares: new forest grew on about 54 hectares, and about 129 hectares were lost.
What is the tree count in Matsumoto?
Matsumoto has an estimated 19,439 trees across the 12.54 km² of land measured — 6.2% tree cover, 24 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Matsumoto need?
Matsumoto needs roughly 74,620 more trees to close a 24-point shortfall against its 30% tree-cover target — about 1,642 t of extra CO₂ absorbed per year once grown.
How are Matsumoto's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near 1 Chome-19 Central, 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 1 Chome-19 Central; the tree count is an estimate derived from that cover.
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