City report · Saitama, Japan
Kōnosu Air quality today
Air quality in Kōnosu currently reads AQI 32 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 32
Good
- PM2.5, fine particles (µg/m³)
- 5.0
- tree cover
- 4.5%
- trees in this area
- 14.1K
- more trees needed
- 80.1K
Measured across a 2 km radius around Konosu, Saitama 365-0028, Japan (12.57 km²), from a satellite image of Jul 25, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Kōnosu · AQI 32 (Good)
Kōnosu's tree count comes to 14,137 trees across 12.57 km², 26 points below the 30% tree-cover level considered healthy for this area, so roughly 80,111 more trees would close the gap.
Air quality detail
Air quality in Kōnosu today: AQI 32, 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
5.0
PM10
20.4
NO₂
24.4
O₃
52.0
SO₂
19.3
CO
206.0
- 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 Kōnosu's daily AQI at 56 on average, from 26 on Nov 7 to an hourly peak of 147 on Nov 5.
Where Kōnosu stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Kōnosu: Critically low
4.5% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
14,137
Target trees
94,248
More trees needed
80,111
CO₂ if planted / yr
1,762 t
Deforestation · 2001–2025
How much forest has Kōnosu lost?
Since 2001, the area within 10 km of Kōnosu has lost about 20 hectares of forest (about 28 football pitches): 2.8% of the forest it had in 2000. Most of it (69%) 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
- 20 haabout 28 football pitches
- Share of its forest
- 2.8%of what there was in 2000
- Cleared for good
- 14 hadeforestation: turned into farms, mines or towns
The worst year was 2019, when about 2 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 | under 1 ha | under 1 ha | 1 ha |
| 2007 | under 1 ha | under 1 ha | under 1 ha |
| 2008 | under 1 ha | under 1 ha | 1 ha |
| 2009 | under 1 ha | under 1 ha | under 1 ha |
| 2010 | 1 ha | under 1 ha | 2 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 | 1 ha | under 1 ha | 1 ha |
| 2017 | under 1 ha | under 1 ha | under 1 ha |
| 2018 | under 1 ha | under 1 ha | under 1 ha |
| 2019 | 2 ha | under 1 ha | 2 ha |
| 2020 | 2 ha | under 1 ha | 2 ha |
| 2021 | 1 ha | under 1 ha | 1 ha |
| 2022 | 2 ha | under 1 ha | 2 ha |
| 2023 | under 1 ha | under 1 ha | under 1 ha |
| 2024 | 1 ha | under 1 ha | 1 ha |
| 2025 | under 1 ha | under 1 ha | under 1 ha |
What is causing deforestation around Kōnosu?
- Towns and roadscleared for good70% · 14 ha
- Unknown causescause unknown29% · 6 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
- 1,180 ha
- Forest in 2020
- 1,150 ha
- Overall change
- −31 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Kōnosu shrank from about 1,180 hectares to 1,150 hectares, a net loss of about 31 hectares (−2.6%). New forest grew on about 41 hectares, but 71 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 Kōnosu
What is the air quality (AQI) in Kōnosu right now?
The latest reading for Kōnosu shows an AQI of 32 (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 Kōnosu today?
At AQI 32 (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 Kōnosu been like this week?
Over the last 7 days, the CAMS air-quality model put Kōnosu's daily AQI at 56 on average, from 26 on Nov 7 to an hourly peak of 147 on Nov 5. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Kōnosu lost since 2001?
Since 2001, the area within 10 km of Kōnosu has lost about 20 hectares of forest (about 28 football pitches): 2.8% of the forest it had in 2000. Most of it (69%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Kōnosu shrank from about 1,180 hectares to 1,150 hectares, a net loss of about 31 hectares (−2.6%). New forest grew on about 41 hectares, but 71 hectares were lost.
What is the tree count in Kōnosu?
Kōnosu has an estimated 14,137 trees across the 12.57 km² measured — 4.5% tree cover, 26 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Kōnosu need?
Kōnosu needs roughly 80,111 more trees to close a 26-point shortfall against its 30% tree-cover target — about 1,762 t of extra CO₂ absorbed per year once grown.
How are Kōnosu'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 Konosu; the tree count is an estimate derived from that cover.
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