City report · Oita, Japan
Ōita Air quality today
Air quality in Ōita 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
- 12.7%
- trees in this area
- 38.9K
- more trees needed
- 53.0K
Measured across a 2 km radius around 2 Chome-9 Omichimachi, Oita, 870-0822, Japan (12.57 km²), from a satellite image of Sep 22, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Ōita · AQI 33 (Good)
Ōita's tree count comes to 38,901 trees across 12.26 km² of land, 17 points below the 30% tree-cover level considered healthy for this area, so roughly 52,991 more trees would close the gap.
Air quality detail
Air quality in Ōita 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 · 大分市南春日町６番１号, 500 m away · median of 9 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
6.0
PM10
7.6
NO₂
5.6
O₃
—
SO₂
6.6
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 Ōita's daily AQI at 42 on average, from 19 on Nov 10 to an hourly peak of 72 on Nov 5.
Where Ōita stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Ōita: Critically low
12.7% tree cover against a 30% healthy-neighborhood target, across 12.26 km² of land.
Trees in this area
38,901
Target trees
91,892
More trees needed
52,991
CO₂ if planted / yr
1,166 t
Deforestation · 2001–2025
How much forest has Ōita lost?
Since 2001, the area within 10 km of Ōita has lost about 264 hectares of forest (about 370 football pitches): 3.8% of the forest it had in 2000. Most of it (70%) 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 south of the city center.
- Forest lost since 2001
- 264 haabout 370 football pitches
- Share of its forest
- 3.8%of what there was in 2000
- Cleared for good
- 186 hadeforestation: turned into farms, mines or towns
The worst year was 2018, when about 27 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 | under 1 ha | 3 ha |
| 2002 | 16 ha | under 1 ha | 17 ha |
| 2003 | 6 ha | under 1 ha | 6 ha |
| 2004 | 8 ha | 3 ha | 11 ha |
| 2005 | 9 ha | under 1 ha | 9 ha |
| 2006 | 12 ha | under 1 ha | 13 ha |
| 2007 | 9 ha | 5 ha | 14 ha |
| 2008 | 7 ha | 2 ha | 9 ha |
| 2009 | 10 ha | 1 ha | 12 ha |
| 2010 | 4 ha | under 1 ha | 4 ha |
| 2011 | 7 ha | under 1 ha | 7 ha |
| 2012 | under 1 ha | under 1 ha | 1 ha |
| 2013 | 1 ha | 2 ha | 3 ha |
| 2014 | 1 ha | under 1 ha | 2 ha |
| 2015 | 1 ha | under 1 ha | 2 ha |
| 2016 | 13 ha | 1 ha | 14 ha |
| 2017 | 5 ha | 2 ha | 7 ha |
| 2018 | 22 ha | 5 ha | 27 ha |
| 2019 | 13 ha | 6 ha | 18 ha |
| 2020 | 7 ha | 12 ha | 18 ha |
| 2021 | 3 ha | 5 ha | 8 ha |
| 2022 | 5 ha | 12 ha | 17 ha |
| 2023 | 12 ha | under 1 ha | 12 ha |
| 2024 | 9 ha | 11 ha | 20 ha |
| 2025 | 6 ha | 6 ha | 12 ha |
What is causing deforestation around Ōita?
- Towns and roadscleared for good67% · 178 ha
- Loggingcan grow back24% · 63 ha
- Mining and energycleared for good3.1% · 8 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
- 8,540 ha
- Forest in 2020
- 8,510 ha
- Overall change
- −22 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Ōita stayed about the same size, at about 8,510 hectares: new forest grew on about 180 hectares, and about 202 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 Ōita
What is the air quality (AQI) in Ōita right now?
The latest reading for Ōita shows an AQI of 33 (Good), measured Nov 12, 01:00 local time by 9 ground monitoring stations via OpenAQ (the median of their readings; the nearest is 大分市南春日町６番１号, 500 m away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Ōita 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 Ōita been like this week?
Over the last 7 days, the CAMS air-quality model put Ōita's daily AQI at 42 on average, from 19 on Nov 10 to an hourly peak of 72 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 Ōita lost since 2001?
Since 2001, the area within 10 km of Ōita has lost about 264 hectares of forest (about 370 football pitches): 3.8% of the forest it had in 2000. Most of it (70%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Ōita stayed about the same size, at about 8,510 hectares: new forest grew on about 180 hectares, and about 202 hectares were lost.
What is the tree count in Ōita?
Ōita has an estimated 38,901 trees across the 12.26 km² of land measured — 12.7% tree cover, 17 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Ōita need?
Ōita needs roughly 52,991 more trees to close a 17-point shortfall against its 30% tree-cover target — about 1,166 t of extra CO₂ absorbed per year once grown.
How are Ōita's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near 2 Chome-9 Omichimachi, 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-9 Omichimachi; the tree count is an estimate derived from that cover.
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