City report · Gunma, Japan
Ōta Air quality today
Air quality in Ōta currently reads AQI 7 (Good): Air quality is satisfactory for everyone.
AQI 7
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 1.2
- tree cover
- 18.5%
- trees in this area
- 58.1K
- more trees needed
- 36.1K
Measured across a 2 km radius around 24 Hachimancho, Ota, Gunma 373-0056, Japan (12.57 km²), from a satellite image of Jul 22, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Ōta · AQI 7 (Good)
Ōta's tree count comes to 58,119 trees across 12.57 km², 12 points below the 30% tree-cover level considered healthy for this area, so roughly 36,128 more trees would close the gap.
Air quality detail
Air quality in Ōta today: AQI 7, Good
Main pollutant: PM2.5 · Observed Nov 11, 23:00 local time via 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), 8.8 km away
Health signal
Air quality is satisfactory for everyone.
PM2.5
1.2
PM10
5.4
NO₂
—
O₃
—
SO₂
—
CO
—
Data: 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 Ōta's daily AQI at 39 on average, from 18 on Nov 7 to an hourly peak of 88 on Nov 5.
Where Ōta stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Ōta: Below target
18.5% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
58,119
Target trees
94,247
More trees needed
36,128
CO₂ if planted / yr
794.8 t
Deforestation · 2001–2025
How much forest has Ōta lost?
Since 2001, the area within 10 km of Ōta has lost about 105 hectares of forest (about 150 football pitches): 3.6% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 38 hectares (37%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from September 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 105 haabout 150 football pitches
- Share of its forest
- 3.6%of what there was in 2000
- Cleared for good
- 38 hadeforestation: turned into farms, mines or towns
The worst year was 2018, when about 17 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 | 1 ha | 2 ha |
| 2002 | 1 ha | 8 ha | 9 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | under 1 ha | 2 ha | 2 ha |
| 2005 | under 1 ha | under 1 ha | 1 ha |
| 2006 | 7 ha | 9 ha | 16 ha |
| 2007 | 9 ha | 2 ha | 10 ha |
| 2008 | under 1 ha | under 1 ha | 1 ha |
| 2009 | under 1 ha | under 1 ha | under 1 ha |
| 2010 | under 1 ha | 4 ha | 4 ha |
| 2011 | under 1 ha | 1 ha | 2 ha |
| 2012 | under 1 ha | 2 ha | 3 ha |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | under 1 ha | under 1 ha | under 1 ha |
| 2015 | under 1 ha | 1 ha | 2 ha |
| 2016 | 4 ha | 7 ha | 11 ha |
| 2017 | under 1 ha | under 1 ha | 1 ha |
| 2018 | under 1 ha | 17 ha | 17 ha |
| 2019 | 3 ha | under 1 ha | 4 ha |
| 2020 | 4 ha | 3 ha | 7 ha |
| 2021 | 1 ha | under 1 ha | 1 ha |
| 2022 | under 1 ha | under 1 ha | under 1 ha |
| 2023 | 2 ha | under 1 ha | 3 ha |
| 2024 | 3 ha | 3 ha | 7 ha |
| 2025 | under 1 ha | 2 ha | 2 ha |
What is causing deforestation around Ōta?
- Loggingcan grow back60% · 63 ha
- Towns and roadscleared for good22% · 23 ha
- Mining and energycleared for good12% · 13 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
- 3,140 ha
- Forest in 2020
- 3,070 ha
- Overall change
- −70 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Ōta shrank from about 3,140 hectares to 3,070 hectares, a net loss of about 70 hectares (−2.2%). New forest grew on about 31 hectares, but 102 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 Ōta
What is the air quality (AQI) in Ōta right now?
The latest reading for Ōta shows an AQI of 7 (Good), measured Nov 11, 23:00 local time by the Honjo, Ashikaga, Tochigi, Japan (足利市役所足利市) ground monitoring station, 8.8 km away, via OpenAQ. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Ōta today?
At AQI 7 (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 Ōta been like this week?
Over the last 7 days, the CAMS air-quality model put Ōta's daily AQI at 39 on average, from 18 on Nov 7 to an hourly peak of 88 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 Ōta lost since 2001?
Since 2001, the area within 10 km of Ōta has lost about 105 hectares of forest (about 150 football pitches): 3.6% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 38 hectares (37%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Ōta shrank from about 3,140 hectares to 3,070 hectares, a net loss of about 70 hectares (−2.2%). New forest grew on about 31 hectares, but 102 hectares were lost.
What is the tree count in Ōta?
Ōta has an estimated 58,119 trees across the 12.57 km² measured — 18.5% tree cover, 12 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Ōta need?
Ōta needs roughly 36,128 more trees to close a 12-point shortfall against its 30% tree-cover target — about 794.8 t of extra CO₂ absorbed per year once grown.
How are Ōta's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near 24 Hachimancho, 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 24 Hachimancho; the tree count is an estimate derived from that cover.
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