City report · Kanagawa, Japan
Aihara Air quality today
Air quality in Aihara 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
- 28.7%
- trees in this area
- 90.2K
- more trees needed
- 4.1K
Measured across a 2 km radius around 5 Chome-15 Aihara, Midori Ward, Sagamihara, Kanagawa 252-0141, Japan (12.57 km²), from a satellite image of Aug 24, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Aihara · AQI 39 (Good)
Aihara's tree count comes to 90,164 trees across 12.57 km², 1 points below the 30% tree-cover level considered healthy for this area, so roughly 4,084 more trees would close the gap.
Air quality detail
Air quality in Aihara today: AQI 39, Good
Main pollutant: PM2.5 · Observed Nov 12, 01:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · 相模原市緑区中野633, 5.7 km away · median of 9 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
7.0
PM10
—
NO₂
15.1
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 Aihara's daily AQI at 62 on average, from 39 on Nov 5 to an hourly peak of 99 on Nov 6.
Where Aihara stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Aihara: Below target
28.7% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
90,164
Target trees
94,248
More trees needed
4,084
CO₂ if planted / yr
89.8 t
Deforestation · 2001–2025
How much forest has Aihara lost?
Since 2001, the area within 10 km of Aihara has lost about 172 hectares of forest (about 240 football pitches): 1.5% of the forest it had in 2000. Most of it (54%) 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
- 172 haabout 240 football pitches
- Share of its forest
- 1.5%of what there was in 2000
- Cleared for good
- 94 hadeforestation: turned into farms, mines or towns
The worst year was 2012, when about 31 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 | 2 ha | 2 ha | 4 ha |
| 2002 | 5 ha | 2 ha | 7 ha |
| 2003 | 3 ha | under 1 ha | 4 ha |
| 2004 | under 1 ha | 1 ha | 2 ha |
| 2005 | 4 ha | 1 ha | 5 ha |
| 2006 | 8 ha | 2 ha | 10 ha |
| 2007 | 5 ha | 2 ha | 7 ha |
| 2008 | 2 ha | 1 ha | 3 ha |
| 2009 | 4 ha | under 1 ha | 5 ha |
| 2010 | 5 ha | 4 ha | 10 ha |
| 2011 | 2 ha | 4 ha | 6 ha |
| 2012 | 13 ha | 18 ha | 31 ha |
| 2013 | 6 ha | 9 ha | 15 ha |
| 2014 | under 1 ha | under 1 ha | under 1 ha |
| 2015 | 2 ha | 5 ha | 6 ha |
| 2016 | 3 ha | 5 ha | 8 ha |
| 2017 | 2 ha | 2 ha | 4 ha |
| 2018 | 3 ha | 7 ha | 10 ha |
| 2019 | 7 ha | under 1 ha | 7 ha |
| 2020 | 9 ha | 6 ha | 15 ha |
| 2021 | under 1 ha | 2 ha | 3 ha |
| 2022 | 1 ha | under 1 ha | 1 ha |
| 2023 | under 1 ha | under 1 ha | under 1 ha |
| 2024 | 3 ha | 2 ha | 5 ha |
| 2025 | 2 ha | 3 ha | 5 ha |
What is causing deforestation around Aihara?
- Towns and roadscleared for good53% · 92 ha
- Loggingcan grow back35% · 60 ha
- Unknown causescause unknown11% · 19 ha
Also: farms, pasture and plantations, mining and energy.
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
- 13,400 ha
- Forest in 2020
- 13,300 ha
- Overall change
- −87 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Aihara stayed about the same size, at about 13,300 hectares: new forest grew on about 150 hectares, and about 237 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 Aihara
What is the air quality (AQI) in Aihara right now?
The latest reading for Aihara shows an AQI of 39 (Good), measured Nov 12, 01:00 local time by 9 ground monitoring stations via OpenAQ (the median of their readings; the nearest is 相模原市緑区中野633, 5.7 km away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Aihara 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 Aihara been like this week?
Over the last 7 days, the CAMS air-quality model put Aihara's daily AQI at 62 on average, from 39 on Nov 5 to an hourly peak of 99 on Nov 6. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Aihara lost since 2001?
Since 2001, the area within 10 km of Aihara has lost about 172 hectares of forest (about 240 football pitches): 1.5% of the forest it had in 2000. Most of it (54%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Aihara stayed about the same size, at about 13,300 hectares: new forest grew on about 150 hectares, and about 237 hectares were lost.
What is the tree count in Aihara?
Aihara has an estimated 90,164 trees across the 12.57 km² measured — 28.7% tree cover, 1 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Aihara need?
Aihara needs roughly 4,084 more trees to close a 1-point shortfall against its 30% tree-cover target — about 89.8 t of extra CO₂ absorbed per year once grown.
How are Aihara's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near 5 Chome-15 Aihara, 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 5 Chome-15 Aihara; the tree count is an estimate derived from that cover.
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