City report · Nagano, Japan
Iida Air quality today
Air quality in Iida currently reads AQI 9 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 9
Good
- PM2.5, fine particles (µg/m³)
- 1.4
- tree cover
- 20.0%
- trees in this area
- 62.8K
- more trees needed
- 31.4K
Measured across a 2 km radius around Kamiiida, Iida, Nagano 395-0000, Japan (12.57 km²), from a satellite image of Aug 31, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Iida · AQI 9 (Good)
Iida's tree count comes to 62,832 trees across 12.57 km², 10 points below the 30% tree-cover level considered healthy for this area, so roughly 31,416 more trees would close the gap.
Air quality detail
Air quality in Iida today: AQI 9, Good
Main pollutant: NO₂ · Observed Nov 11, 19:00 local time via Open-Meteo / CAMS, corrected with 17 ground-station cities within 225 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 17 station cities within 225 km, e.g. Matsumoto and Fuchu
Health signal
Air quality is satisfactory for everyone.
PM2.5
1.4
PM10
5.6
NO₂
18.9
O₃
52.0
SO₂
2.8
CO
343.0
- 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 Iida's daily AQI at 21 on average, from 12 on Nov 11 to an hourly peak of 65 on Nov 6.
Where Iida stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Iida: Below target
20.0% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
62,832
Target trees
94,248
More trees needed
31,416
CO₂ if planted / yr
691.2 t
Deforestation · 2001–2025
How much forest has Iida lost?
Since 2001, the area within 10 km of Iida has lost about 396 hectares of forest (about 550 football pitches): 2% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 130 hectares (33%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from June 2017 of a 5 × 5 km area about 6 km west of the city center.
- Forest lost since 2001
- 396 haabout 550 football pitches
- Share of its forest
- 2%of what there was in 2000
- Cleared for good
- 130 hadeforestation: turned into farms, mines or towns
The worst year was 2010, when about 42 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 | 3 ha | 20 ha | 23 ha |
| 2002 | 3 ha | 22 ha | 25 ha |
| 2003 | 5 ha | 16 ha | 21 ha |
| 2004 | 6 ha | 13 ha | 19 ha |
| 2005 | 4 ha | 19 ha | 24 ha |
| 2006 | 2 ha | 18 ha | 20 ha |
| 2007 | 4 ha | 15 ha | 18 ha |
| 2008 | 4 ha | 10 ha | 14 ha |
| 2009 | 7 ha | 23 ha | 30 ha |
| 2010 | 26 ha | 16 ha | 42 ha |
| 2011 | 16 ha | 9 ha | 25 ha |
| 2012 | 5 ha | 5 ha | 10 ha |
| 2013 | 3 ha | 1 ha | 4 ha |
| 2014 | 2 ha | 1 ha | 3 ha |
| 2015 | 5 ha | 2 ha | 6 ha |
| 2016 | under 1 ha | 6 ha | 7 ha |
| 2017 | under 1 ha | 3 ha | 3 ha |
| 2018 | 7 ha | 6 ha | 13 ha |
| 2019 | 6 ha | 3 ha | 8 ha |
| 2020 | 1 ha | 11 ha | 13 ha |
| 2021 | 6 ha | 10 ha | 16 ha |
| 2022 | 10 ha | 3 ha | 13 ha |
| 2023 | 2 ha | 23 ha | 25 ha |
| 2024 | 2 ha | 7 ha | 9 ha |
| 2025 | under 1 ha | 5 ha | 6 ha |
What is causing deforestation around Iida?
- Loggingcan grow back61% · 241 ha
- Towns and roadscleared for good27% · 106 ha
- Mining and energycleared for good6.1% · 24 ha
Also: 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
- 20,500 ha
- Forest in 2020
- 20,500 ha
- Overall change
- +5 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Iida stayed about the same size, at about 20,500 hectares: new forest grew on about 157 hectares, and about 153 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 Iida
What is the air quality (AQI) in Iida right now?
The latest reading for Iida shows an AQI of 9 (Good), observed Nov 11, 19:00 local time via Open-Meteo / CAMS, corrected with 17 ground-station cities within 225 km, US EPA index. The main pollutant is NO₂. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Iida today?
At AQI 9 (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 Iida been like this week?
Over the last 7 days, the CAMS air-quality model put Iida's daily AQI at 21 on average, from 12 on Nov 11 to an hourly peak of 65 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 Iida lost since 2001?
Since 2001, the area within 10 km of Iida has lost about 396 hectares of forest (about 550 football pitches): 2% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 130 hectares (33%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Iida stayed about the same size, at about 20,500 hectares: new forest grew on about 157 hectares, and about 153 hectares were lost.
What is the tree count in Iida?
Iida has an estimated 62,832 trees across the 12.57 km² measured — 20.0% tree cover, 10 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Iida need?
Iida needs roughly 31,416 more trees to close a 10-point shortfall against its 30% tree-cover target — about 691.2 t of extra CO₂ absorbed per year once grown.
How are Iida'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 Kamiiida; the tree count is an estimate derived from that cover.
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