City report · Chiba, Japan
Matsudo Air quality today
Air quality in Matsudo currently reads AQI 46 (Good): Air quality is satisfactory for everyone.
AQI 46
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 8.2
- tree cover
- 10.9%
- trees in this area
- 33.4K
- more trees needed
- 58.4K
Measured across a 2 km radius around Matsudo, Chiba 271-0092, Japan (12.57 km²), from a satellite image of Aug 24, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Matsudo · AQI 46 (Good)
Matsudo's tree count comes to 33,353 trees across 12.24 km² of land, 19 points below the 30% tree-cover level considered healthy for this area, so roughly 58,444 more trees would close the gap.
Air quality detail
Air quality in Matsudo today: AQI 46, 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 · 松戸市上本郷２２３４－５, 2.4 km away · median of 18 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
8.2
PM10
14.0
NO₂
41.4
O₃
—
SO₂
0.0
CO
458.2
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), Tokyo, Japan Environment Agency (東京都環境局)
- 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 Matsudo's daily AQI at 51 on average, from 34 on Nov 11 to an hourly peak of 123 on Nov 6.
Where Matsudo stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Matsudo: Critically low
10.9% tree cover against a 30% healthy-neighborhood target, across 12.24 km² of land.
Trees in this area
33,353
Target trees
91,797
More trees needed
58,444
CO₂ if planted / yr
1,286 t
Deforestation · 2001–2025
How much forest has Matsudo lost?
Since 2001, the area within 10 km of Matsudo has lost about 24 hectares of forest (about 34 football pitches): 2.4% 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 in the city center.
- Forest lost since 2001
- 24 haabout 34 football pitches
- Share of its forest
- 2.4%of what there was in 2000
- Cleared for good
- 17 hadeforestation: turned into farms, mines or towns
The worst year was 2008, when about 5 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 | under 1 ha | under 1 ha | under 1 ha |
| 2005 | under 1 ha | under 1 ha | under 1 ha |
| 2006 | 2 ha | 2 ha | 3 ha |
| 2007 | under 1 ha | under 1 ha | under 1 ha |
| 2008 | 4 ha | under 1 ha | 5 ha |
| 2009 | 3 ha | 1 ha | 4 ha |
| 2010 | under 1 ha | under 1 ha | under 1 ha |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | 2 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 | 1 ha | under 1 ha | 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 Matsudo?
- Towns and roadscleared for good69% · 17 ha
- Unknown causescause unknown30% · 7 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
- 2,020 ha
- Forest in 2020
- 1,970 ha
- Overall change
- −46 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Matsudo shrank from about 2,020 hectares to 1,970 hectares, a net loss of about 46 hectares (−2.3%). New forest grew on about 75 hectares, but 121 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 Matsudo
What is the air quality (AQI) in Matsudo right now?
The latest reading for Matsudo shows an AQI of 46 (Good), measured Nov 12, 01:00 local time by 18 ground monitoring stations via OpenAQ (the median of their readings; the nearest is 松戸市上本郷２２３４－５, 2.4 km away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Matsudo today?
At AQI 46 (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 Matsudo been like this week?
Over the last 7 days, the CAMS air-quality model put Matsudo's daily AQI at 51 on average, from 34 on Nov 11 to an hourly peak of 123 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 Matsudo lost since 2001?
Since 2001, the area within 10 km of Matsudo has lost about 24 hectares of forest (about 34 football pitches): 2.4% 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 Matsudo shrank from about 2,020 hectares to 1,970 hectares, a net loss of about 46 hectares (−2.3%). New forest grew on about 75 hectares, but 121 hectares were lost.
What is the tree count in Matsudo?
Matsudo has an estimated 33,353 trees across the 12.24 km² of land measured — 10.9% tree cover, 19 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Matsudo need?
Matsudo needs roughly 58,444 more trees to close a 19-point shortfall against its 30% tree-cover target — about 1,286 t of extra CO₂ absorbed per year once grown.
How are Matsudo's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Matsudo, 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 Matsudo; the tree count is an estimate derived from that cover.
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