City report · Saitama, Japan
Tokorozawa Air quality today
Air quality in Tokorozawa currently reads AQI 39 (Good): Air quality is satisfactory for everyone.
AQI 39
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 7.0
- tree cover
- 13.5%
- trees in this area
- 42.4K
- more trees needed
- 51.8K
Measured across a 2 km radius around 1 Chome Namiki, Tokorozawa, Saitama 359-0042, Japan (12.57 km²), from a satellite image of Jul 25, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Tokorozawa · AQI 39 (Good)
Tokorozawa's tree count comes to 42,412 trees across 12.57 km², 16 points below the 30% tree-cover level considered healthy for this area, so roughly 51,836 more trees would close the gap.
Air quality detail
Air quality in Tokorozawa today: AQI 39, 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 · Tokorozawa, Saitama, Japan (所沢市和ヶ原所沢市), 100 m away · median of 13 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
7.0
PM10
10.8
NO₂
33.9
O₃
—
SO₂
0.0
CO
—
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), Saitama Prefecture EPA (埼玉県の大気状況)
- 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 Tokorozawa's daily AQI at 74 on average, from 61 on Nov 7 to an hourly peak of 155 on Nov 5.
Where Tokorozawa stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Tokorozawa: Critically low
13.5% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
42,412
Target trees
94,248
More trees needed
51,836
CO₂ if planted / yr
1,140 t
Deforestation · 2001–2025
How much forest has Tokorozawa lost?
Since 2001, the area within 10 km of Tokorozawa has lost about 123 hectares of forest (about 170 football pitches): 3.8% of the forest it had in 2000. Most of it (75%) 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
- 123 haabout 170 football pitches
- Share of its forest
- 3.8%of what there was in 2000
- Cleared for good
- 92 hadeforestation: turned into farms, mines or towns
The worst year was 2018, when about 17 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 | 2 ha | 5 ha |
| 2002 | 5 ha | 9 ha | 13 ha |
| 2003 | 2 ha | under 1 ha | 3 ha |
| 2004 | 4 ha | under 1 ha | 4 ha |
| 2005 | 3 ha | 2 ha | 5 ha |
| 2006 | 8 ha | 4 ha | 11 ha |
| 2007 | 7 ha | 2 ha | 9 ha |
| 2008 | 5 ha | 2 ha | 7 ha |
| 2009 | 2 ha | 1 ha | 4 ha |
| 2010 | 7 ha | 4 ha | 11 ha |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | 5 ha | 1 ha | 6 ha |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | under 1 ha | under 1 ha | under 1 ha |
| 2015 | 3 ha | under 1 ha | 3 ha |
| 2016 | 7 ha | under 1 ha | 8 ha |
| 2017 | 3 ha | under 1 ha | 3 ha |
| 2018 | 17 ha | under 1 ha | 17 ha |
| 2019 | 2 ha | under 1 ha | 2 ha |
| 2020 | 2 ha | under 1 ha | 2 ha |
| 2021 | 2 ha | under 1 ha | 2 ha |
| 2022 | 1 ha | under 1 ha | 2 ha |
| 2023 | 1 ha | under 1 ha | 1 ha |
| 2024 | 2 ha | under 1 ha | 2 ha |
| 2025 | 2 ha | under 1 ha | 3 ha |
What is causing deforestation around Tokorozawa?
- Towns and roadscleared for good75% · 91 ha
- Storms, floods and other natural causescan grow back7.7% · 9 ha
- Loggingcan grow back1.1% · 1 ha
Also: unknown causes.
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
- 4,620 ha
- Forest in 2020
- 4,400 ha
- Overall change
- −223 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Tokorozawa shrank from about 4,620 hectares to 4,400 hectares, a net loss of about 223 hectares (−4.8%). New forest grew on about 87 hectares, but 309 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 Tokorozawa
What is the air quality (AQI) in Tokorozawa right now?
The latest reading for Tokorozawa shows an AQI of 39 (Good), measured Nov 12, 01:00 local time by 13 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Tokorozawa, Saitama, Japan (所沢市和ヶ原所沢市), 100 m away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Tokorozawa today?
At AQI 39 (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 Tokorozawa been like this week?
Over the last 7 days, the CAMS air-quality model put Tokorozawa'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 Tokorozawa lost since 2001?
Since 2001, the area within 10 km of Tokorozawa has lost about 123 hectares of forest (about 170 football pitches): 3.8% of the forest it had in 2000. Most of it (75%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Tokorozawa shrank from about 4,620 hectares to 4,400 hectares, a net loss of about 223 hectares (−4.8%). New forest grew on about 87 hectares, but 309 hectares were lost.
What is the tree count in Tokorozawa?
Tokorozawa has an estimated 42,412 trees across the 12.57 km² measured — 13.5% tree cover, 16 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Tokorozawa need?
Tokorozawa needs roughly 51,836 more trees to close a 16-point shortfall against its 30% tree-cover target — about 1,140 t of extra CO₂ absorbed per year once grown.
How are Tokorozawa's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near 1 Chome Namiki, 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 1 Chome Namiki; the tree count is an estimate derived from that cover.
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