City report · Kanagawa, Japan
Yokohama Air quality today
Air quality in Yokohama currently reads AQI 44 (Good): Air quality is satisfactory for everyone.
AQI 44
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 8.0
- tree cover
- 17.9%
- trees in this area
- 47.0K
- more trees needed
- 31.7K
Measured across a 2 km radius around Myokojidai, Naka Ward, Yokohama, Kanagawa 231-0841, Japan (12.57 km²), from a satellite image of Aug 24, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Yokohama · AQI 44 (Good)
Yokohama's tree count comes to 46,956 trees across 10.5 km² of land, 12 points below the 30% tree-cover level considered healthy for this area, so roughly 31,741 more trees would close the gap.
Air quality detail
Air quality in Yokohama today: AQI 44, 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 · Yokohama (横浜), 1.6 km away · median of 13 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
8.0
PM10
16.2
NO₂
58.3
O₃
—
SO₂
7.9
CO
458.2
Data: OpenAQ · Ministry of the Environment Air Pollutant Wide Area Monitoring System, World Air Quality Index Project, Kanagawa Prefectural Environmental Science Research Center, Environmental Monitoring Information Division (神奈川県環境科学センター 環境監視情報課), 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 Yokohama's daily AQI at 74 on average, from 61 on Nov 7 to an hourly peak of 155 on Nov 5.
Where Yokohama stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Yokohama: Critically low
17.9% tree cover against a 30% healthy-neighborhood target, across 10.5 km² of land.
Trees in this area
46,956
Target trees
78,697
More trees needed
31,741
CO₂ if planted / yr
698.3 t
Deforestation · 2001–2025
How much forest has Yokohama lost?
Since 2001, the area within 10 km of Yokohama has lost about 19 hectares of forest (about 26 football pitches): 1.4% of the forest it had in 2000. Most of it (72%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from July 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 19 haabout 26 football pitches
- Share of its forest
- 1.4%of what there was in 2000
- Cleared for good
- 14 hadeforestation: turned into farms, mines or towns
The worst year was 2004, when about 3 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 | under 1 ha | under 1 ha |
| 2002 | under 1 ha | under 1 ha | under 1 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | 2 ha | under 1 ha | 3 ha |
| 2005 | under 1 ha | under 1 ha | under 1 ha |
| 2006 | 3 ha | under 1 ha | 3 ha |
| 2007 | 2 ha | under 1 ha | 3 ha |
| 2008 | under 1 ha | under 1 ha | 1 ha |
| 2009 | under 1 ha | under 1 ha | under 1 ha |
| 2010 | under 1 ha | under 1 ha | 1 ha |
| 2011 | under 1 ha | under 1 ha | 1 ha |
| 2012 | under 1 ha | 1 ha | 2 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 | under 1 ha | under 1 ha |
| 2016 | under 1 ha | under 1 ha | under 1 ha |
| 2017 | under 1 ha | under 1 ha | under 1 ha |
| 2018 | under 1 ha | under 1 ha | under 1 ha |
| 2019 | under 1 ha | under 1 ha | under 1 ha |
| 2020 | under 1 ha | under 1 ha | under 1 ha |
| 2021 | under 1 ha | under 1 ha | under 1 ha |
| 2022 | under 1 ha | under 1 ha | under 1 ha |
| 2023 | under 1 ha | under 1 ha | under 1 ha |
| 2024 | under 1 ha | under 1 ha | under 1 ha |
| 2025 | under 1 ha | under 1 ha | under 1 ha |
What is causing deforestation around Yokohama?
- Towns and roadscleared for good72% · 14 ha
- Unknown causescause unknown28% · 5 ha
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
- 2,570 ha
- Forest in 2020
- 2,570 ha
- Overall change
- +4 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Yokohama stayed about the same size, at about 2,570 hectares: new forest grew on about 85 hectares, and about 81 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 Yokohama
Same 2 km radius, same index — so they compare directly.
- Yokosuka16.7 km
Japan
- Tree cover
- 32%
- Air quality
- 56
- Fujisawa18.3 km
Japan
- Tree cover
- 17%
- Air quality
- 46
- Shinagawa20.9 km
Japan
- Tree cover
- 4%
- Air quality
- 26
- Machida21.6 km
Japan
- Tree cover
- 11%
- Air quality
- 46
- Atsugi25.5 km
Japan
- Tree cover
- 9%
- Air quality
- 46
- Kisarazu26.2 km
Japan
- Tree cover
- 10%
- Air quality
- 23
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Frequently asked
Questions about Yokohama
What is the air quality (AQI) in Yokohama right now?
The latest reading for Yokohama shows an AQI of 44 (Good), measured Nov 12, 01:00 local time by 13 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Yokohama (横浜), 1.6 km away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Yokohama today?
At AQI 44 (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 Yokohama been like this week?
Over the last 7 days, the CAMS air-quality model put Yokohama's daily AQI at 74 on average, from 61 on Nov 7 to an hourly peak of 155 on Nov 5. On 1 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Yokohama lost since 2001?
Since 2001, the area within 10 km of Yokohama has lost about 19 hectares of forest (about 26 football pitches): 1.4% of the forest it had in 2000. Most of it (72%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Yokohama stayed about the same size, at about 2,570 hectares: new forest grew on about 85 hectares, and about 81 hectares were lost.
What is the tree count in Yokohama?
Yokohama has an estimated 46,956 trees across the 10.5 km² of land measured — 17.9% tree cover, 12 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Yokohama need?
Yokohama needs roughly 31,741 more trees to close a 12-point shortfall against its 30% tree-cover target — about 698.3 t of extra CO₂ absorbed per year once grown.
How are Yokohama's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Myokojidai, 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 Myokojidai; the tree count is an estimate derived from that cover.
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