City report · Shiga, Japan
Hikone Air quality today
Air quality in Hikone currently reads AQI 16 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 16
Good
- PM2.5, fine particles (µg/m³)
- 2.2
- tree cover
- 11.3%
- trees in this area
- 35.5K
- more trees needed
- 58.7K
Measured across a 2 km radius around Koizumicho, Hikone, Shiga 522-0043, Japan (12.57 km²), from a satellite image of Aug 2, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Hikone · AQI 16 (Good)
Hikone's tree count comes to 35,500 trees across 12.57 km², 19 points below the 30% tree-cover level considered healthy for this area, so roughly 58,748 more trees would close the gap.
Air quality detail
Air quality in Hikone today: AQI 16, Good
Main pollutant: PM2.5 · Observed Nov 11, 12:00 local time via Open-Meteo / CAMS, US EPA index. Values in µg/m³.
Model estimate · no ground station nearby
Health signal
Air quality is satisfactory for everyone.
PM2.5
2.2
PM10
2.7
NO₂
2.2
O₃
89.0
SO₂
1.6
CO
130.0
- 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 Hikone's daily AQI at 39 on average, from 25 on Nov 11 to an hourly peak of 73 on Nov 5.
Where Hikone stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Hikone: Critically low
11.3% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
35,500
Target trees
94,248
More trees needed
58,748
CO₂ if planted / yr
1,292 t
Deforestation · 2001–2025
How much forest has Hikone lost?
Since 2001, the area within 10 km of Hikone has lost about 194 hectares of forest (about 270 football pitches): 2.1% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 47 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
- 194 haabout 270 football pitches
- Share of its forest
- 2.1%of what there was in 2000
- Cleared for good
- 47 hadeforestation: turned into farms, mines or towns
The worst year was 2006, when about 19 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 | 4 ha | 5 ha |
| 2002 | under 1 ha | 8 ha | 8 ha |
| 2003 | under 1 ha | 7 ha | 7 ha |
| 2004 | 3 ha | 13 ha | 16 ha |
| 2005 | under 1 ha | 9 ha | 10 ha |
| 2006 | 3 ha | 17 ha | 19 ha |
| 2007 | under 1 ha | 7 ha | 7 ha |
| 2008 | 7 ha | 10 ha | 17 ha |
| 2009 | 3 ha | 12 ha | 16 ha |
| 2010 | 2 ha | 10 ha | 12 ha |
| 2011 | under 1 ha | 6 ha | 6 ha |
| 2012 | 1 ha | 7 ha | 9 ha |
| 2013 | 1 ha | 3 ha | 4 ha |
| 2014 | under 1 ha | 1 ha | 1 ha |
| 2015 | 12 ha | 2 ha | 14 ha |
| 2016 | under 1 ha | 8 ha | 8 ha |
| 2017 | under 1 ha | 3 ha | 3 ha |
| 2018 | under 1 ha | 2 ha | 2 ha |
| 2019 | 2 ha | 4 ha | 6 ha |
| 2020 | 2 ha | 5 ha | 7 ha |
| 2021 | 1 ha | 2 ha | 3 ha |
| 2022 | under 1 ha | 2 ha | 2 ha |
| 2023 | 2 ha | under 1 ha | 3 ha |
| 2024 | under 1 ha | 2 ha | 2 ha |
| 2025 | 2 ha | 4 ha | 6 ha |
What is causing deforestation around Hikone?
- Loggingcan grow back69% · 134 ha
- Towns and roadscleared for good17% · 33 ha
- Farms, pasture and plantationscleared for good7.3% · 14 ha
Also: 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
- 9,660 ha
- Forest in 2020
- 9,620 ha
- Overall change
- −44 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Hikone stayed about the same size, at about 9,620 hectares: new forest grew on about 38 hectares, and about 82 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 Hikone
What is the air quality (AQI) in Hikone right now?
The latest reading for Hikone shows an AQI of 16 (Good), observed Nov 11, 12:00 local time via Open-Meteo / CAMS, US EPA index. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Hikone today?
At AQI 16 (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 Hikone been like this week?
Over the last 7 days, the CAMS air-quality model put Hikone'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 Hikone lost since 2001?
Since 2001, the area within 10 km of Hikone has lost about 194 hectares of forest (about 270 football pitches): 2.1% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 47 hectares (24%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Hikone stayed about the same size, at about 9,620 hectares: new forest grew on about 38 hectares, and about 82 hectares were lost.
What is the tree count in Hikone?
Hikone has an estimated 35,500 trees across the 12.57 km² measured — 11.3% tree cover, 19 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Hikone need?
Hikone needs roughly 58,748 more trees to close a 19-point shortfall against its 30% tree-cover target — about 1,292 t of extra CO₂ absorbed per year once grown.
How are Hikone's air quality and tree cover measured?
Air quality comes from ground monitoring stations via OpenAQ where one reports nearby, and otherwise, as here, from the Open-Meteo / CAMS model, which may differ from street-level monitors. 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 Koizumicho; the tree count is an estimate derived from that cover.
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