City report · Kanagawa, Japan
Yokosuka Air quality today
Air quality in Yokosuka 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
- 32.1%
- trees in this area
- 65.5K
- more trees needed
- 0
Measured across a 2 km radius around Inaokacho, Yokosuka, Kanagawa 238-0003, Japan (12.57 km²), from a satellite image of Aug 24, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Yokosuka · AQI 33 (Good)
Yokosuka's tree count comes to 65,549 trees across 8.17 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Yokosuka today: AQI 33, Good
Main pollutant: PM2.5 · Observed Nov 12, 01:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · 横須賀市小川町3番地, 300 m away · median of 7 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
6.0
PM10
—
NO₂
18.8
O₃
—
SO₂
0.0
CO
343.7
Data: OpenAQ · Ministry of the Environment Air Pollutant Wide Area Monitoring System
- 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 Yokosuka's daily AQI at 47 on average, from 37 on Nov 7 to an hourly peak of 88 on Nov 6.
Where Yokosuka stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Yokosuka: Healthy tree cover
32.1% tree cover against a 30% healthy-neighborhood target, across 8.17 km² of land.
Trees in this area
65,549
Target trees
65,549
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Yokosuka lost?
Since 2001, the area within 10 km of Yokosuka has lost about 85 hectares of forest (about 120 football pitches): 1.4% of the forest it had in 2000. Most of it (88%) 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
- 85 haabout 120 football pitches
- Share of its forest
- 1.4%of what there was in 2000
- Cleared for good
- 75 hadeforestation: turned into farms, mines or towns
The worst year was 2002, when about 18 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 | 3 ha | under 1 ha | 4 ha |
| 2002 | 17 ha | under 1 ha | 18 ha |
| 2003 | 2 ha | under 1 ha | 2 ha |
| 2004 | 5 ha | under 1 ha | 5 ha |
| 2005 | 2 ha | under 1 ha | 2 ha |
| 2006 | 3 ha | under 1 ha | 4 ha |
| 2007 | 3 ha | under 1 ha | 3 ha |
| 2008 | 6 ha | under 1 ha | 7 ha |
| 2009 | 6 ha | under 1 ha | 7 ha |
| 2010 | 1 ha | under 1 ha | 2 ha |
| 2011 | 1 ha | under 1 ha | 2 ha |
| 2012 | 1 ha | 2 ha | 3 ha |
| 2013 | 2 ha | under 1 ha | 2 ha |
| 2014 | under 1 ha | under 1 ha | under 1 ha |
| 2015 | 6 ha | under 1 ha | 6 ha |
| 2016 | 4 ha | under 1 ha | 5 ha |
| 2017 | 3 ha | under 1 ha | 3 ha |
| 2018 | under 1 ha | under 1 ha | 1 ha |
| 2019 | 2 ha | under 1 ha | 2 ha |
| 2020 | 4 ha | under 1 ha | 4 ha |
| 2021 | under 1 ha | under 1 ha | under 1 ha |
| 2022 | under 1 ha | under 1 ha | under 1 ha |
| 2023 | 1 ha | under 1 ha | 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 Yokosuka?
- Towns and roadscleared for good89% · 75 ha
- Unknown causescause unknown11% · 10 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
- 7,720 ha
- Forest in 2020
- 7,670 ha
- Overall change
- −51 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Yokosuka stayed about the same size, at about 7,670 hectares: new forest grew on about 96 hectares, and about 147 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 Yokosuka
What is the air quality (AQI) in Yokosuka right now?
The latest reading for Yokosuka shows an AQI of 33 (Good), measured Nov 12, 01:00 local time by 7 ground monitoring stations via OpenAQ (the median of their readings; the nearest is 横須賀市小川町3番地, 300 m away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Yokosuka 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 Yokosuka been like this week?
Over the last 7 days, the CAMS air-quality model put Yokosuka's daily AQI at 47 on average, from 37 on Nov 7 to an hourly peak of 88 on Nov 6. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Yokosuka lost since 2001?
Since 2001, the area within 10 km of Yokosuka has lost about 85 hectares of forest (about 120 football pitches): 1.4% of the forest it had in 2000. Most of it (88%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Yokosuka stayed about the same size, at about 7,670 hectares: new forest grew on about 96 hectares, and about 147 hectares were lost.
What is the tree count in Yokosuka?
Yokosuka has an estimated 65,549 trees across the 8.17 km² of land measured — 32.1% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Yokosuka need?
Yokosuka has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Yokosuka's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Inaokacho, 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 Inaokacho; the tree count is an estimate derived from that cover.
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