City report · Tochigi, Japan
Oyama Air quality today
Air quality in Oyama currently reads AQI 22 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 22
Good
- PM2.5, fine particles (µg/m³)
- 3.2
- tree cover
- 11.3%
- trees in this area
- 35.5K
- more trees needed
- 58.7K
Measured across a 2 km radius around 1 Chome Nishijonan, Oyama, Tochigi 323-0820, Japan (12.57 km²), from a satellite image of Jul 20, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Oyama · AQI 22 (Good)
Oyama's tree count comes to 35,464 trees across 12.56 km² of land, 19 points below the 30% tree-cover level considered healthy for this area, so roughly 58,689 more trees would close the gap.
Air quality detail
Air quality in Oyama today: AQI 22, Good
Main pollutant: PM2.5 · Observed Nov 11, 11:00 local time via Open-Meteo / CAMS, corrected with 16 ground-station cities within 145 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 16 station cities within 145 km, e.g. Noda and Kawaguchi
Health signal
Air quality is satisfactory for everyone.
PM2.5
3.2
PM10
13.9
NO₂
13.4
O₃
59.0
SO₂
6.9
CO
166.0
- 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 Oyama's daily AQI at 41 on average, from 12 on Nov 7 to an hourly peak of 85 on Nov 11.
Where Oyama stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Oyama: Critically low
11.3% tree cover against a 30% healthy-neighborhood target, across 12.56 km² of land.
Trees in this area
35,464
Target trees
94,153
More trees needed
58,689
CO₂ if planted / yr
1,291 t
Deforestation · 2001–2025
How much forest has Oyama lost?
Since 2001, the area within 10 km of Oyama has lost about 171 hectares of forest (about 240 football pitches): 8.4% of the forest it had in 2000. Most of it (89%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from September 2017 of a 5 × 5 km area about 4 km south of the city center.
- Forest lost since 2001
- 171 haabout 240 football pitches
- Share of its forest
- 8.4%of what there was in 2000
- Cleared for good
- 153 hadeforestation: turned into farms, mines or towns
The worst year was 2022, when about 21 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 | 2 ha | 1 ha | 3 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | 1 ha | under 1 ha | 2 ha |
| 2005 | 2 ha | under 1 ha | 2 ha |
| 2006 | 3 ha | under 1 ha | 4 ha |
| 2007 | under 1 ha | under 1 ha | 1 ha |
| 2008 | 2 ha | under 1 ha | 2 ha |
| 2009 | 8 ha | under 1 ha | 8 ha |
| 2010 | 7 ha | under 1 ha | 8 ha |
| 2011 | under 1 ha | under 1 ha | 1 ha |
| 2012 | 10 ha | 2 ha | 11 ha |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | 5 ha | under 1 ha | 5 ha |
| 2015 | 7 ha | under 1 ha | 8 ha |
| 2016 | 14 ha | under 1 ha | 15 ha |
| 2017 | 9 ha | under 1 ha | 9 ha |
| 2018 | 7 ha | under 1 ha | 7 ha |
| 2019 | 5 ha | under 1 ha | 6 ha |
| 2020 | 7 ha | under 1 ha | 7 ha |
| 2021 | 6 ha | under 1 ha | 7 ha |
| 2022 | 19 ha | 2 ha | 21 ha |
| 2023 | 11 ha | under 1 ha | 12 ha |
| 2024 | 10 ha | 1 ha | 11 ha |
| 2025 | 15 ha | 3 ha | 19 ha |
What is causing deforestation around Oyama?
- Towns and roadscleared for good88% · 151 ha
- Loggingcan grow back2.7% · 5 ha
- Unknown causescause unknown7.8% · 13 ha
Also: farms, pasture and plantations.
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
- 2,350 ha
- Forest in 2020
- 2,140 ha
- Overall change
- −209 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Oyama shrank from about 2,350 hectares to 2,140 hectares, a net loss of about 209 hectares (−8.9%). New forest grew on about 62 hectares, but 271 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 Oyama
What is the air quality (AQI) in Oyama right now?
The latest reading for Oyama shows an AQI of 22 (Good), observed Nov 11, 11:00 local time via Open-Meteo / CAMS, corrected with 16 ground-station cities within 145 km, US EPA index. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Oyama today?
At AQI 22 (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 Oyama been like this week?
Over the last 7 days, the CAMS air-quality model put Oyama'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 Oyama lost since 2001?
Since 2001, the area within 10 km of Oyama has lost about 171 hectares of forest (about 240 football pitches): 8.4% of the forest it had in 2000. Most of it (89%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Oyama shrank from about 2,350 hectares to 2,140 hectares, a net loss of about 209 hectares (−8.9%). New forest grew on about 62 hectares, but 271 hectares were lost.
What is the tree count in Oyama?
Oyama has an estimated 35,464 trees across the 12.56 km² of land measured — 11.3% tree cover, 19 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Oyama need?
Oyama needs roughly 58,689 more trees to close a 19-point shortfall against its 30% tree-cover target — about 1,291 t of extra CO₂ absorbed per year once grown.
How are Oyama'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 1 Chome Nishijonan; the tree count is an estimate derived from that cover.
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