City report · Chiba, Japan
Urayasu Air quality today
Air quality in Urayasu currently reads AQI 55 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 55
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 11.0
- tree cover
- 8.1%
- trees in this area
- 23.7K
- more trees needed
- 64.2K
Measured across a 2 km radius around 2 Chome-9 Nekozane, Urayasu, Chiba 279-0004, Japan (12.57 km²), from a satellite image of Aug 24, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Urayasu · AQI 55 (Moderate)
Urayasu's tree count comes to 23,742 trees across 11.73 km² of land, 22 points below the 30% tree-cover level considered healthy for this area, so roughly 64,191 more trees would close the gap.
Air quality detail
Air quality in Urayasu today: AQI 55, Moderate
Main pollutant: PM2.5 · Observed Nov 12, 00:00 local time via World Air Quality Index Project ground stations, US EPA index. Values in µg/m³.
Ground station · Koto (江東区), 7.7 km away
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
11.0
PM10
11.9
NO₂
—
O₃
—
SO₂
—
CO
—
Data: 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
- Fine for most people; unusually sensitive people should take long or hard exercise easier
- Windows
- Fine to open; close them if you are sensitive to pollution
- Mask
- Not needed for most people
- Air purifier
- Worth running if you are sensitive
Over the last 7 days, the CAMS air-quality model put Urayasu's daily AQI at 51 on average, from 34 on Nov 11 to an hourly peak of 123 on Nov 6.
Where Urayasu stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Urayasu: Critically low
8.1% tree cover against a 30% healthy-neighborhood target, across 11.73 km² of land.
Trees in this area
23,742
Target trees
87,933
More trees needed
64,191
CO₂ if planted / yr
1,412 t
Deforestation · 2001–2025
How much forest has Urayasu lost?
Since 2001, the area within 10 km of Urayasu has lost about 2 hectares of forest: 1.2% of the forest it had in 2000. The biggest cause was towns and roads (25%). Almost none of it was deforestation, meaning forest cleared for good.
2017: satellite photo from July 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 2 ha
- Share of its forest
- 1.2%of what there was in 2000
- Cleared for good
- under 1 hadeforestation: turned into farms, mines or towns
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 | under 1 ha | under 1 ha | under 1 ha |
| 2007 | under 1 ha | under 1 ha | under 1 ha |
| 2008 | under 1 ha | under 1 ha | under 1 ha |
| 2009 | under 1 ha | under 1 ha | under 1 ha |
| 2010 | under 1 ha | under 1 ha | under 1 ha |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | under 1 ha | under 1 ha | under 1 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 Urayasu?
- Towns and roadscleared for good25% · under 1 ha
- Unknown causescause unknown81% · 1 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
- 391 ha
- Forest in 2020
- 440 ha
- Overall change
- +49 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Urayasu grew from about 391 hectares to 440 hectares, a net gain of about 49 hectares (+13%). New forest grew on about 57 hectares, while 7 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 Urayasu
What is the air quality (AQI) in Urayasu right now?
The latest reading for Urayasu shows an AQI of 55 (Moderate), measured Nov 12, 00:00 local time by the Koto (江東区) ground monitoring station, 7.7 km away, via OpenAQ. The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Urayasu today?
At AQI 55 (Moderate): fine for most people; unusually sensitive people should take long or hard exercise easier. Windows: fine to open; close them if you are sensitive to pollution. Masks: not needed for most people. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Urayasu been like this week?
Over the last 7 days, the CAMS air-quality model put Urayasu'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 Urayasu lost since 2001?
Since 2001, the area within 10 km of Urayasu has lost about 2 hectares of forest: 1.2% of the forest it had in 2000. The biggest cause was towns and roads (25%). Almost none of it was deforestation, meaning forest cleared for good. Comparing satellite maps from 2000 and 2020, the forest around Urayasu grew from about 391 hectares to 440 hectares, a net gain of about 49 hectares (+13%). New forest grew on about 57 hectares, while 7 hectares were lost.
What is the tree count in Urayasu?
Urayasu has an estimated 23,742 trees across the 11.73 km² of land measured — 8.1% tree cover, 22 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Urayasu need?
Urayasu needs roughly 64,191 more trees to close a 22-point shortfall against its 30% tree-cover target — about 1,412 t of extra CO₂ absorbed per year once grown.
How are Urayasu's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near 2 Chome-9 Nekozane, 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 Nekozane; the tree count is an estimate derived from that cover.
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