City report · Shizuoka, Japan
Numazu Air quality today
Air quality in Numazu currently reads AQI 6 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 6
Good
- PM2.5, fine particles (µg/m³)
- 1.0
- tree cover
- 14.3%
- trees in this area
- 43.2K
- more trees needed
- 47.4K
Measured across a 2 km radius around 16 Hiramachi, Numazu, Shizuoka 410-0036, Japan (12.57 km²), from a satellite image of Aug 24, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Numazu · AQI 6 (Good)
Numazu's tree count comes to 43,173 trees across 12.08 km² of land, 16 points below the 30% tree-cover level considered healthy for this area, so roughly 47,399 more trees would close the gap.
Air quality detail
Air quality in Numazu today: AQI 6, Good
Main pollutant: PM2.5 · Observed Nov 11, 22:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · 沼津市高島本町１－３, 1.2 km away · median of 2 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
1.0
PM10
—
NO₂
—
O₃
—
SO₂
0.0
CO
229.1
Data: OpenAQ · Ministry of the Environment Air Pollutant Wide Area Monitoring System
- 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 Numazu's daily AQI at 46 on average, from 20 on Nov 5 to an hourly peak of 71 on Nov 8.
Where Numazu stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Numazu: Critically low
14.3% tree cover against a 30% healthy-neighborhood target, across 12.08 km² of land.
Trees in this area
43,173
Target trees
90,572
More trees needed
47,399
CO₂ if planted / yr
1,043 t
Deforestation · 2001–2025
How much forest has Numazu lost?
Since 2001, the area within 10 km of Numazu has lost about 146 hectares of forest (about 200 football pitches): 2% 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 June 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 146 haabout 200 football pitches
- Share of its forest
- 2%of what there was in 2000
- Cleared for good
- 129 hadeforestation: turned into farms, mines or towns
The worst year was 2004, when about 20 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 | 7 ha | under 1 ha | 8 ha |
| 2002 | 11 ha | under 1 ha | 12 ha |
| 2003 | 3 ha | under 1 ha | 3 ha |
| 2004 | 20 ha | under 1 ha | 20 ha |
| 2005 | 9 ha | under 1 ha | 10 ha |
| 2006 | 6 ha | under 1 ha | 6 ha |
| 2007 | 6 ha | under 1 ha | 7 ha |
| 2008 | 7 ha | 1 ha | 9 ha |
| 2009 | 4 ha | 2 ha | 6 ha |
| 2010 | 5 ha | under 1 ha | 6 ha |
| 2011 | 4 ha | under 1 ha | 5 ha |
| 2012 | 7 ha | 2 ha | 9 ha |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | under 1 ha | under 1 ha | under 1 ha |
| 2015 | 2 ha | under 1 ha | 2 ha |
| 2016 | 13 ha | 1 ha | 14 ha |
| 2017 | 4 ha | under 1 ha | 5 ha |
| 2018 | 1 ha | under 1 ha | 2 ha |
| 2019 | 5 ha | under 1 ha | 6 ha |
| 2020 | 4 ha | 2 ha | 5 ha |
| 2021 | 5 ha | under 1 ha | 5 ha |
| 2022 | 1 ha | under 1 ha | 2 ha |
| 2023 | 2 ha | under 1 ha | 2 ha |
| 2024 | under 1 ha | under 1 ha | under 1 ha |
| 2025 | under 1 ha | 2 ha | 2 ha |
What is causing deforestation around Numazu?
- Towns and roadscleared for good80% · 116 ha
- Farms, pasture and plantationscleared for good8.7% · 13 ha
- Loggingcan grow back3% · 4 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
- 9,570 ha
- Forest in 2020
- 9,420 ha
- Overall change
- −155 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Numazu stayed about the same size, at about 9,420 hectares: new forest grew on about 94 hectares, and about 249 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 Numazu
What is the air quality (AQI) in Numazu right now?
The latest reading for Numazu shows an AQI of 6 (Good), measured Nov 11, 22:00 local time by 2 ground monitoring stations via OpenAQ (the median of their readings; the nearest is 沼津市高島本町１－３, 1.2 km away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Numazu today?
At AQI 6 (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 Numazu been like this week?
Over the last 7 days, the CAMS air-quality model put Numazu's daily AQI at 46 on average, from 20 on Nov 5 to an hourly peak of 71 on Nov 8. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Numazu lost since 2001?
Since 2001, the area within 10 km of Numazu has lost about 146 hectares of forest (about 200 football pitches): 2% 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 Numazu stayed about the same size, at about 9,420 hectares: new forest grew on about 94 hectares, and about 249 hectares were lost.
What is the tree count in Numazu?
Numazu has an estimated 43,173 trees across the 12.08 km² of land measured — 14.3% tree cover, 16 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Numazu need?
Numazu needs roughly 47,399 more trees to close a 16-point shortfall against its 30% tree-cover target — about 1,043 t of extra CO₂ absorbed per year once grown.
How are Numazu's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near 16 Hiramachi, 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 16 Hiramachi; the tree count is an estimate derived from that cover.
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