City report · Aichi, Japan
Seto Air quality today
Air quality in Seto currently reads AQI 33 (Good): Air quality is satisfactory for everyone.
AQI 33
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 6.0
- tree cover
- 36.6%
- trees in this area
- 115K
- more trees needed
- 0
Measured across a 2 km radius around Nishiinzocho, Seto, Aichi 489-0079, Japan (12.57 km²), from a satellite image of Aug 24, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Seto · AQI 33 (Good)
Seto's tree count comes to 114,637 trees across 12.53 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Seto today: AQI 33, Good
Main pollutant: PM2.5 · Observed Nov 12, 01:00 local time via OpenAQ and World Air Quality Index Project ground stations, US EPA index. Values in µg/m³.
Ground station · 豊田市加納町西股７５, 10.9 km away · median of 40 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
6.0
PM10
8.6
NO₂
22.6
O₃
—
SO₂
0.0
CO
286.4
Data: OpenAQ · Ministry of the Environment Air Pollutant Wide Area Monitoring System, 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), Aichi air pollution continuous monitoring results (愛知県大気汚染常時監視結果)
- 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 Seto's daily AQI at 49 on average, from 26 on Nov 7 to an hourly peak of 96 on Nov 5.
Where Seto stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Seto: Healthy tree cover
36.6% tree cover against a 30% healthy-neighborhood target, across 12.53 km² of land.
Trees in this area
114,637
Target trees
114,637
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Seto lost?
Since 2001, the area within 10 km of Seto has lost about 414 hectares of forest (about 580 football pitches): 2.6% of the forest it had in 2000. Most of it (87%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from July 2017 of a 5 × 5 km area about 7 km northeast of the city center.
- Forest lost since 2001
- 414 haabout 580 football pitches
- Share of its forest
- 2.6%of what there was in 2000
- Cleared for good
- 362 hadeforestation: turned into farms, mines or towns
The worst year was 2004, 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 | 13 ha | under 1 ha | 13 ha |
| 2002 | 19 ha | 5 ha | 23 ha |
| 2003 | 17 ha | under 1 ha | 18 ha |
| 2004 | 37 ha | 5 ha | 42 ha |
| 2005 | 20 ha | 6 ha | 25 ha |
| 2006 | 23 ha | 1 ha | 24 ha |
| 2007 | 10 ha | 1 ha | 11 ha |
| 2008 | 30 ha | 3 ha | 33 ha |
| 2009 | 24 ha | 3 ha | 28 ha |
| 2010 | 14 ha | 1 ha | 15 ha |
| 2011 | 13 ha | 1 ha | 14 ha |
| 2012 | 9 ha | 2 ha | 11 ha |
| 2013 | 7 ha | under 1 ha | 8 ha |
| 2014 | 6 ha | under 1 ha | 6 ha |
| 2015 | 8 ha | under 1 ha | 8 ha |
| 2016 | 18 ha | under 1 ha | 19 ha |
| 2017 | 8 ha | 5 ha | 13 ha |
| 2018 | 6 ha | 2 ha | 8 ha |
| 2019 | 4 ha | under 1 ha | 4 ha |
| 2020 | 6 ha | under 1 ha | 6 ha |
| 2021 | 17 ha | 6 ha | 23 ha |
| 2022 | 26 ha | under 1 ha | 27 ha |
| 2023 | 11 ha | under 1 ha | 12 ha |
| 2024 | 9 ha | 2 ha | 11 ha |
| 2025 | 10 ha | 4 ha | 13 ha |
What is causing deforestation around Seto?
- Towns and roadscleared for good75% · 310 ha
- Mining and energycleared for good12% · 49 ha
- Loggingcan grow back6.8% · 28 ha
Also: farms, pasture and plantations, 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
- 17,500 ha
- Forest in 2020
- 17,400 ha
- Overall change
- −142 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Seto stayed about the same size, at about 17,400 hectares: new forest grew on about 233 hectares, and about 375 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
In the same region
Measured cities near Seto
Same 2 km radius, same index — so they compare directly.
- Toyota17.3 km
Japan
- Tree cover
- 8%
- Air quality
- 39
- Nagoya18.5 km
Japan
- Tree cover
- 9%
- Air quality
- 39
- Kani19.4 km
Japan
- Tree cover
- 37%
- Air quality
- 22
- Ichinomiya28.2 km
Japan
- Tree cover
- 3%
- Air quality
- 50
- Tōkai29.2 km
Japan
- Tree cover
- 19%
- Air quality
- 33
- Kakamigahara29.4 km
Japan
- Tree cover
- 17%
- Air quality
- 22
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Frequently asked
Questions about Seto
What is the air quality (AQI) in Seto right now?
The latest reading for Seto shows an AQI of 33 (Good), measured Nov 12, 01:00 local time by 40 ground monitoring stations via OpenAQ (the median of their readings; the nearest is 豊田市加納町西股７５, 10.9 km away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Seto today?
At AQI 33 (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 Seto been like this week?
Over the last 7 days, the CAMS air-quality model put Seto's daily AQI at 49 on average, from 26 on Nov 7 to an hourly peak of 96 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 Seto lost since 2001?
Since 2001, the area within 10 km of Seto has lost about 414 hectares of forest (about 580 football pitches): 2.6% of the forest it had in 2000. Most of it (87%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Seto stayed about the same size, at about 17,400 hectares: new forest grew on about 233 hectares, and about 375 hectares were lost.
What is the tree count in Seto?
Seto has an estimated 114,637 trees across the 12.53 km² of land measured — 36.6% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Seto need?
Seto has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Seto's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Nishiinzocho, 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 Nishiinzocho; the tree count is an estimate derived from that cover.
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