City report · Tochigi, Japan
Sano Air quality today
Air quality in Sano currently reads AQI 19 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 19
Good
- PM2.5, fine particles (µg/m³)
- 2.9
- tree cover
- 4.7%
- trees in this area
- 14.8K
- more trees needed
- 79.5K
Measured across a 2 km radius around Kubocho, Sano, Tochigi 327-0845, Japan (12.57 km²), from a satellite image of Jul 22, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Sano · AQI 19 (Good)
Sano's tree count comes to 14,765 trees across 12.57 km², 25 points below the 30% tree-cover level considered healthy for this area, so roughly 79,482 more trees would close the gap.
Air quality detail
Air quality in Sano today: AQI 19, Good
Main pollutant: PM2.5 · Observed Nov 11, 12:00 local time via Open-Meteo / CAMS, corrected with 16 ground-station cities within 125 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 16 station cities within 125 km, e.g. Noda and Niiza
Health signal
Air quality is satisfactory for everyone.
PM2.5
2.9
PM10
12.7
NO₂
12.0
O₃
65.0
SO₂
6.2
CO
147.0
- 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 Sano's daily AQI at 41 on average, from 12 on Nov 7 to an hourly peak of 85 on Nov 11.
Where Sano stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Sano: Critically low
4.7% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
14,765
Target trees
94,247
More trees needed
79,482
CO₂ if planted / yr
1,749 t
Deforestation · 2001–2025
How much forest has Sano lost?
Since 2001, the area within 10 km of Sano has lost about 296 hectares of forest (about 410 football pitches): 4.1% of the forest it had in 2000. Most of it (72%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from June 2017 of a 5 × 5 km area about 7 km northeast of the city center.
- Forest lost since 2001
- 296 haabout 410 football pitches
- Share of its forest
- 4.1%of what there was in 2000
- Cleared for good
- 212 hadeforestation: turned into farms, mines or towns
The worst year was 2020, when about 62 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 | 4 ha | 3 ha | 7 ha |
| 2002 | 6 ha | 11 ha | 17 ha |
| 2003 | under 1 ha | under 1 ha | 2 ha |
| 2004 | 4 ha | 2 ha | 6 ha |
| 2005 | 4 ha | 3 ha | 6 ha |
| 2006 | 3 ha | 7 ha | 10 ha |
| 2007 | 7 ha | 3 ha | 10 ha |
| 2008 | 3 ha | 4 ha | 8 ha |
| 2009 | 1 ha | 2 ha | 3 ha |
| 2010 | 7 ha | 3 ha | 10 ha |
| 2011 | under 1 ha | 8 ha | 8 ha |
| 2012 | 11 ha | 7 ha | 18 ha |
| 2013 | 3 ha | 2 ha | 5 ha |
| 2014 | 14 ha | 7 ha | 21 ha |
| 2015 | 4 ha | 4 ha | 7 ha |
| 2016 | 13 ha | 2 ha | 16 ha |
| 2017 | 13 ha | 2 ha | 16 ha |
| 2018 | 14 ha | 4 ha | 18 ha |
| 2019 | 20 ha | under 1 ha | 20 ha |
| 2020 | 61 ha | under 1 ha | 62 ha |
| 2021 | 4 ha | under 1 ha | 5 ha |
| 2022 | 2 ha | 1 ha | 3 ha |
| 2023 | 4 ha | 2 ha | 5 ha |
| 2024 | 4 ha | 2 ha | 6 ha |
| 2025 | 6 ha | 2 ha | 8 ha |
What is causing deforestation around Sano?
- Towns and roadscleared for good37% · 110 ha
- Mining and energycleared for good34% · 102 ha
- Loggingcan grow back24% · 72 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
- 7,720 ha
- Forest in 2020
- 7,480 ha
- Overall change
- −237 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Sano shrank from about 7,720 hectares to 7,480 hectares, a net loss of about 237 hectares (−3.1%). New forest grew on about 86 hectares, but 323 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 Sano
What is the air quality (AQI) in Sano right now?
The latest reading for Sano shows an AQI of 19 (Good), observed Nov 11, 12:00 local time via Open-Meteo / CAMS, corrected with 16 ground-station cities within 125 km, US EPA index. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Sano today?
At AQI 19 (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 Sano been like this week?
Over the last 7 days, the CAMS air-quality model put Sano's daily AQI at 41 on average, from 12 on Nov 7 to an hourly peak of 85 on Nov 11. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Sano lost since 2001?
Since 2001, the area within 10 km of Sano has lost about 296 hectares of forest (about 410 football pitches): 4.1% of the forest it had in 2000. Most of it (72%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Sano shrank from about 7,720 hectares to 7,480 hectares, a net loss of about 237 hectares (−3.1%). New forest grew on about 86 hectares, but 323 hectares were lost.
What is the tree count in Sano?
Sano has an estimated 14,765 trees across the 12.57 km² measured — 4.7% tree cover, 25 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Sano need?
Sano needs roughly 79,482 more trees to close a 25-point shortfall against its 30% tree-cover target — about 1,749 t of extra CO₂ absorbed per year once grown.
How are Sano'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 Kubocho; the tree count is an estimate derived from that cover.
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