City report · Japan
Kofu Air quality today
Air quality in Kofu currently reads AQI 28 (Good): Air quality is satisfactory for everyone.
AQI 28
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 5.0
- tree cover
- 11.4%
- trees in this area
- 35.8K
- more trees needed
- 58.4K
Measured across a 2 km radius around 2 Chome-5 Marunouchi, Kofu, Yamanashi 400-0031, Japan (12.57 km²), from a satellite image of Sep 18, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Kofu · AQI 28 (Good)
Kofu's tree count comes to 35,814 trees across 12.57 km², 19 points below the 30% tree-cover level considered healthy for this area, so roughly 58,434 more trees would close the gap.
Air quality detail
Air quality in Kofu today: AQI 28, Good
Main pollutant: PM2.5 · Observed Nov 12, 01:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · 笛吹市石和町上平井1047-1, 10 km away · median of 4 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
5.0
PM10
—
NO₂
—
O₃
—
SO₂
0.0
CO
343.7
Data: OpenAQ · Ministry of the Environment Air Pollutant Wide Area Monitoring System
- 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 Kofu's daily AQI at 24 on average, from 12 on Nov 5 to an hourly peak of 69 on Nov 6.
Where Kofu stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Kofu: Critically low
11.4% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
35,814
Target trees
94,248
More trees needed
58,434
CO₂ if planted / yr
1,286 t
Deforestation · 2001–2025
How much forest has Kofu lost?
Since 2001, the area within 10 km of Kofu has lost about 421 hectares of forest (about 590 football pitches): 4.1% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 104 hectares (25%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from June 2017 of a 5 × 5 km area about 7 km northwest of the city center.
- Forest lost since 2001
- 421 haabout 590 football pitches
- Share of its forest
- 4.1%of what there was in 2000
- Cleared for good
- 104 hadeforestation: turned into farms, mines or towns
The worst year was 2016, when about 46 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 | 9 ha | 9 ha |
| 2002 | under 1 ha | 9 ha | 10 ha |
| 2003 | under 1 ha | 4 ha | 4 ha |
| 2004 | under 1 ha | 4 ha | 4 ha |
| 2005 | 1 ha | 14 ha | 15 ha |
| 2006 | under 1 ha | 4 ha | 4 ha |
| 2007 | 1 ha | 14 ha | 15 ha |
| 2008 | 1 ha | 15 ha | 16 ha |
| 2009 | 6 ha | 14 ha | 19 ha |
| 2010 | under 1 ha | 5 ha | 6 ha |
| 2011 | under 1 ha | 14 ha | 14 ha |
| 2012 | 1 ha | 11 ha | 12 ha |
| 2013 | 26 ha | 10 ha | 36 ha |
| 2014 | 13 ha | 23 ha | 36 ha |
| 2015 | 8 ha | 10 ha | 18 ha |
| 2016 | 6 ha | 40 ha | 46 ha |
| 2017 | 2 ha | 10 ha | 12 ha |
| 2018 | 1 ha | 10 ha | 12 ha |
| 2019 | under 1 ha | 14 ha | 15 ha |
| 2020 | 19 ha | 20 ha | 39 ha |
| 2021 | 5 ha | 18 ha | 23 ha |
| 2022 | under 1 ha | 28 ha | 28 ha |
| 2023 | under 1 ha | 12 ha | 13 ha |
| 2024 | 4 ha | 6 ha | 10 ha |
| 2025 | 5 ha | 2 ha | 7 ha |
What is causing deforestation around Kofu?
- Loggingcan grow back73% · 309 ha
- Mining and energycleared for good15% · 61 ha
- Towns and roadscleared for good9.5% · 40 ha
Also: farms, pasture and plantations, 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
- 11,000 ha
- Forest in 2020
- 10,900 ha
- Overall change
- −98 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Kofu stayed about the same size, at about 10,900 hectares: new forest grew on about 96 hectares, and about 195 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 Kofu
What is the air quality (AQI) in Kofu right now?
The latest reading for Kofu shows an AQI of 28 (Good), measured Nov 12, 01:00 local time by 4 ground monitoring stations via OpenAQ (the median of their readings; the nearest is 笛吹市石和町上平井1047-1, 10 km away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Kofu today?
At AQI 28 (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 Kofu been like this week?
Over the last 7 days, the CAMS air-quality model put Kofu's daily AQI at 24 on average, from 12 on Nov 5 to an hourly peak of 69 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 Kofu lost since 2001?
Since 2001, the area within 10 km of Kofu has lost about 421 hectares of forest (about 590 football pitches): 4.1% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 104 hectares (25%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Kofu stayed about the same size, at about 10,900 hectares: new forest grew on about 96 hectares, and about 195 hectares were lost.
What is the tree count in Kofu?
Kofu has an estimated 35,814 trees across the 12.57 km² measured — 11.4% tree cover, 19 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Kofu need?
Kofu needs roughly 58,434 more trees to close a 19-point shortfall against its 30% tree-cover target — about 1,286 t of extra CO₂ absorbed per year once grown.
How are Kofu's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near 2 Chome-5 Marunouchi, 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 2 Chome-5 Marunouchi; the tree count is an estimate derived from that cover.
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