City report · Saitama, Japan
Kumagaya Air quality today
Air quality in Kumagaya currently reads AQI 11 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 11
Good
- PM2.5, fine particles (µg/m³)
- 0.8
- tree cover
- 8.6%
- trees in this area
- 27.0K
- more trees needed
- 67.2K
Measured across a 2 km radius around 1 Chome Manpeicho, Kumagaya, Saitama 360-0034, Japan (12.57 km²), from a satellite image of Jul 22, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Kumagaya · AQI 11 (Good)
Kumagaya's tree count comes to 27,018 trees across 12.57 km², 21 points below the 30% tree-cover level considered healthy for this area, so roughly 67,230 more trees would close the gap.
Air quality detail
Air quality in Kumagaya today: AQI 11, Good
Main pollutant: PM2.5 · Observed Nov 11, 10:00 local time via Open-Meteo / CAMS, corrected with 16 ground-station cities within 105 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 16 station cities within 105 km, e.g. Niiza and Kawaguchi
Health signal
Air quality is satisfactory for everyone.
PM2.5
0.8
PM10
3.9
NO₂
4.8
O₃
68.0
SO₂
2.6
CO
201.0
- 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 Kumagaya's daily AQI at 47 on average, from 19 on Nov 7 to an hourly peak of 77 on Nov 10.
Where Kumagaya stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Kumagaya: Critically low
8.6% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
27,018
Target trees
94,248
More trees needed
67,230
CO₂ if planted / yr
1,479 t
Deforestation · 2001–2025
How much forest has Kumagaya lost?
Since 2001, the area within 10 km of Kumagaya has lost about 126 hectares of forest (about 180 football pitches): 4.1% 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 September 2017 of a 5 × 5 km area about 7 km southwest of the city center.
- Forest lost since 2001
- 126 haabout 180 football pitches
- Share of its forest
- 4.1%of what there was in 2000
- Cleared for good
- 111 hadeforestation: turned into farms, mines or towns
The worst year was 2020, when about 26 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 | 1 ha |
| 2002 | 1 ha | under 1 ha | 1 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | 3 ha | under 1 ha | 3 ha |
| 2005 | under 1 ha | under 1 ha | under 1 ha |
| 2006 | 3 ha | 1 ha | 4 ha |
| 2007 | 4 ha | 1 ha | 5 ha |
| 2008 | under 1 ha | under 1 ha | under 1 ha |
| 2009 | under 1 ha | under 1 ha | 2 ha |
| 2010 | 3 ha | under 1 ha | 4 ha |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | 4 ha | under 1 ha | 4 ha |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | 1 ha | under 1 ha | 2 ha |
| 2015 | 7 ha | under 1 ha | 8 ha |
| 2016 | 9 ha | 2 ha | 11 ha |
| 2017 | 6 ha | 1 ha | 7 ha |
| 2018 | 5 ha | under 1 ha | 6 ha |
| 2019 | 6 ha | under 1 ha | 7 ha |
| 2020 | 26 ha | under 1 ha | 26 ha |
| 2021 | 14 ha | under 1 ha | 14 ha |
| 2022 | 8 ha | under 1 ha | 9 ha |
| 2023 | 6 ha | under 1 ha | 7 ha |
| 2024 | 1 ha | 2 ha | 4 ha |
| 2025 | 2 ha | under 1 ha | 2 ha |
What is causing deforestation around Kumagaya?
- Towns and roadscleared for good88% · 111 ha
- Loggingcan grow back6.4% · 8 ha
- Unknown causescause unknown6.1% · 8 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
- 3,600 ha
- Forest in 2020
- 3,520 ha
- Overall change
- −84 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Kumagaya shrank from about 3,600 hectares to 3,520 hectares, a net loss of about 84 hectares (−2.3%). New forest grew on about 107 hectares, but 191 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 Kumagaya
What is the air quality (AQI) in Kumagaya right now?
The latest reading for Kumagaya shows an AQI of 11 (Good), observed Nov 11, 10:00 local time via Open-Meteo / CAMS, corrected with 16 ground-station cities within 105 km, US EPA index. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Kumagaya today?
At AQI 11 (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 Kumagaya been like this week?
Over the last 7 days, the CAMS air-quality model put Kumagaya's daily AQI at 47 on average, from 19 on Nov 7 to an hourly peak of 77 on Nov 10. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Kumagaya lost since 2001?
Since 2001, the area within 10 km of Kumagaya has lost about 126 hectares of forest (about 180 football pitches): 4.1% 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 Kumagaya shrank from about 3,600 hectares to 3,520 hectares, a net loss of about 84 hectares (−2.3%). New forest grew on about 107 hectares, but 191 hectares were lost.
What is the tree count in Kumagaya?
Kumagaya has an estimated 27,018 trees across the 12.57 km² measured — 8.6% tree cover, 21 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Kumagaya need?
Kumagaya needs roughly 67,230 more trees to close a 21-point shortfall against its 30% tree-cover target — about 1,479 t of extra CO₂ absorbed per year once grown.
How are Kumagaya's air quality and tree cover measured?
Air quality comes from ground monitoring stations via OpenAQ where one reports nearby, and otherwise, as here, from the Open-Meteo / CAMS model, which may differ from street-level monitors. 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 Manpeicho; the tree count is an estimate derived from that cover.
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