City report · Tochigi, Japan
Ashikaga Air quality today
Air quality in Ashikaga currently reads AQI 26 (Good): Air quality is satisfactory for everyone.
AQI 26
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 4.6
- tree cover
- 21.9%
- trees in this area
- 68.7K
- more trees needed
- 25.4K
Measured across a 2 km radius around 2 Chome Tori, Ashikaga, Tochigi 326-0814, Japan (12.57 km²), from a satellite image of Jul 22, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Ashikaga · AQI 26 (Good)
Ashikaga's tree count comes to 68,732 trees across 12.56 km² of land, 8 points below the 30% tree-cover level considered healthy for this area, so roughly 25,421 more trees would close the gap.
Air quality detail
Air quality in Ashikaga today: AQI 26, 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 · Honjo, Ashikaga, Tochigi, Japan (足利市役所足利市), 800 m away · median of 5 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
4.6
PM10
5.4
NO₂
19.8
O₃
—
SO₂
0.0
CO
229.1
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)
- 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 Ashikaga's daily AQI at 41 on average, from 12 on Nov 7 to an hourly peak of 85 on Nov 11.
Where Ashikaga stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Ashikaga: Below target
21.9% tree cover against a 30% healthy-neighborhood target, across 12.56 km² of land.
Trees in this area
68,732
Target trees
94,153
More trees needed
25,421
CO₂ if planted / yr
559.3 t
Deforestation · 2001–2025
How much forest has Ashikaga lost?
Since 2001, the area within 10 km of Ashikaga has lost about 393 hectares of forest (about 550 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 100 hectares (25%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from September 2017 of a 5 × 5 km area about 6 km north of the city center.
- Forest lost since 2001
- 393 haabout 550 football pitches
- Share of its forest
- 4.1%of what there was in 2000
- Cleared for good
- 100 hadeforestation: turned into farms, mines or towns
The worst year was 2016, when about 35 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 | 11 ha | 13 ha |
| 2002 | 7 ha | 17 ha | 24 ha |
| 2003 | under 1 ha | 4 ha | 5 ha |
| 2004 | 3 ha | 4 ha | 6 ha |
| 2005 | 5 ha | 8 ha | 13 ha |
| 2006 | 11 ha | 15 ha | 26 ha |
| 2007 | 7 ha | 11 ha | 18 ha |
| 2008 | 1 ha | 16 ha | 17 ha |
| 2009 | 1 ha | 8 ha | 9 ha |
| 2010 | 7 ha | 11 ha | 18 ha |
| 2011 | 1 ha | 6 ha | 7 ha |
| 2012 | 2 ha | 10 ha | 11 ha |
| 2013 | under 1 ha | 7 ha | 7 ha |
| 2014 | 3 ha | 6 ha | 9 ha |
| 2015 | 3 ha | 4 ha | 6 ha |
| 2016 | 12 ha | 23 ha | 35 ha |
| 2017 | 4 ha | 19 ha | 24 ha |
| 2018 | 9 ha | 24 ha | 33 ha |
| 2019 | 9 ha | 3 ha | 13 ha |
| 2020 | 4 ha | 15 ha | 19 ha |
| 2021 | 1 ha | 22 ha | 23 ha |
| 2022 | under 1 ha | 14 ha | 15 ha |
| 2023 | 2 ha | 13 ha | 14 ha |
| 2024 | 4 ha | 15 ha | 19 ha |
| 2025 | 2 ha | 9 ha | 11 ha |
What is causing deforestation around Ashikaga?
- Loggingcan grow back73% · 285 ha
- Towns and roadscleared for good17% · 69 ha
- Mining and energycleared for good7.9% · 31 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
- 10,100 ha
- Forest in 2020
- 10,000 ha
- Overall change
- −136 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Ashikaga stayed about the same size, at about 10,000 hectares: new forest grew on about 69 hectares, and about 206 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 Ashikaga
What is the air quality (AQI) in Ashikaga right now?
The latest reading for Ashikaga shows an AQI of 26 (Good), measured Nov 12, 01:00 local time by 5 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Honjo, Ashikaga, Tochigi, Japan (足利市役所足利市), 800 m away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Ashikaga today?
At AQI 26 (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 Ashikaga been like this week?
Over the last 7 days, the CAMS air-quality model put Ashikaga's daily AQI at 41 on average, from 12 on Nov 7 to an hourly peak of 85 on Nov 11. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Ashikaga lost since 2001?
Since 2001, the area within 10 km of Ashikaga has lost about 393 hectares of forest (about 550 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 100 hectares (25%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Ashikaga stayed about the same size, at about 10,000 hectares: new forest grew on about 69 hectares, and about 206 hectares were lost.
What is the tree count in Ashikaga?
Ashikaga has an estimated 68,732 trees across the 12.56 km² of land measured — 21.9% tree cover, 8 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Ashikaga need?
Ashikaga needs roughly 25,421 more trees to close a 8-point shortfall against its 30% tree-cover target — about 559.3 t of extra CO₂ absorbed per year once grown.
How are Ashikaga's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near 2 Chome Tori, 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 Tori; the tree count is an estimate derived from that cover.
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