City report · Shiga, Japan
Nagahama Air quality today
Air quality in Nagahama currently reads AQI 11 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 11
Good
- PM2.5, fine particles (µg/m³)
- 2.0
- tree cover
- 2.4%
- trees in this area
- 5.9K
- more trees needed
- 68.4K
Measured across a 2 km radius around 27 Motohamacho, Nagahama, Shiga 526-0059, Japan (12.57 km²), from a satellite image of Aug 24, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Nagahama · AQI 11 (Good)
Nagahama's tree count comes to 5,949 trees across 9.92 km² of land, 28 points below the 30% tree-cover level considered healthy for this area, so roughly 68,413 more trees would close the gap.
Air quality detail
Air quality in Nagahama today: AQI 11, Good
Main pollutant: PM2.5 · Observed Nov 11, 22:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · 長浜市分木町８－５, 600 m away
Health signal
Air quality is satisfactory for everyone.
PM2.5
2.0
PM10
—
NO₂
15.1
O₃
—
SO₂
0.0
CO
—
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 Nagahama's daily AQI at 39 on average, from 25 on Nov 11 to an hourly peak of 73 on Nov 5.
Where Nagahama stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Nagahama: Critically low
2.4% tree cover against a 30% healthy-neighborhood target, across 9.92 km² of land.
Trees in this area
5,949
Target trees
74,362
More trees needed
68,413
CO₂ if planted / yr
1,505 t
Deforestation · 2001–2025
How much forest has Nagahama lost?
Since 2001, the area within 10 km of Nagahama has lost about 111 hectares of forest (about 160 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 26 hectares (24%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from August 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 111 haabout 160 football pitches
- Share of its forest
- 1.8%of what there was in 2000
- Cleared for good
- 26 hadeforestation: turned into farms, mines or towns
The worst year was 2012, when about 13 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 | 5 ha | 6 ha |
| 2002 | 2 ha | 8 ha | 10 ha |
| 2003 | under 1 ha | 7 ha | 7 ha |
| 2004 | 2 ha | 10 ha | 11 ha |
| 2005 | under 1 ha | 2 ha | 2 ha |
| 2006 | 1 ha | 5 ha | 6 ha |
| 2007 | under 1 ha | 5 ha | 5 ha |
| 2008 | 3 ha | 7 ha | 10 ha |
| 2009 | 1 ha | 8 ha | 9 ha |
| 2010 | 5 ha | 5 ha | 10 ha |
| 2011 | 4 ha | 3 ha | 7 ha |
| 2012 | 2 ha | 10 ha | 13 ha |
| 2013 | 1 ha | under 1 ha | 2 ha |
| 2014 | under 1 ha | under 1 ha | under 1 ha |
| 2015 | under 1 ha | 1 ha | 2 ha |
| 2016 | under 1 ha | under 1 ha | 1 ha |
| 2017 | under 1 ha | under 1 ha | under 1 ha |
| 2018 | under 1 ha | 2 ha | 2 ha |
| 2019 | under 1 ha | 1 ha | 2 ha |
| 2020 | under 1 ha | 1 ha | 1 ha |
| 2021 | under 1 ha | 1 ha | 1 ha |
| 2022 | under 1 ha | 1 ha | 2 ha |
| 2023 | under 1 ha | under 1 ha | under 1 ha |
| 2024 | under 1 ha | under 1 ha | under 1 ha |
| 2025 | under 1 ha | 2 ha | 2 ha |
What is causing deforestation around Nagahama?
- Loggingcan grow back67% · 75 ha
- Towns and roadscleared for good23% · 26 ha
- Unknown causescause unknown9.4% · 11 ha
Also: farms, pasture and plantations.
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
- 6,250 ha
- Forest in 2020
- 6,230 ha
- Overall change
- −18 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Nagahama stayed about the same size, at about 6,230 hectares: new forest grew on about 35 hectares, and about 53 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 Nagahama
What is the air quality (AQI) in Nagahama right now?
The latest reading for Nagahama shows an AQI of 11 (Good), measured Nov 11, 22:00 local time by the 長浜市分木町８－５ ground monitoring station, 600 m away, via OpenAQ. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Nagahama today?
At AQI 11 (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 Nagahama been like this week?
Over the last 7 days, the CAMS air-quality model put Nagahama's daily AQI at 39 on average, from 25 on Nov 11 to an hourly peak of 73 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 Nagahama lost since 2001?
Since 2001, the area within 10 km of Nagahama has lost about 111 hectares of forest (about 160 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 26 hectares (24%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Nagahama stayed about the same size, at about 6,230 hectares: new forest grew on about 35 hectares, and about 53 hectares were lost.
What is the tree count in Nagahama?
Nagahama has an estimated 5,949 trees across the 9.92 km² of land measured — 2.4% tree cover, 28 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Nagahama need?
Nagahama needs roughly 68,413 more trees to close a 28-point shortfall against its 30% tree-cover target — about 1,505 t of extra CO₂ absorbed per year once grown.
How are Nagahama's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near 27 Motohamacho, 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 27 Motohamacho; the tree count is an estimate derived from that cover.
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