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City report · Osaka, Japan

Sakai Air quality today

Air quality in Sakai currently reads AQI 53 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.

Air quality right now

AQI 53

Moderate

Main pollutant: PM2.5
PM2.5, fine particles (µg/m³)
7.0
tree cover
2.0%
trees in this area
5.2K
more trees needed
72.5K

Measured across a 2 km radius around 5 Chome Ebisujimacho, Sakai Ward, Sakai, Osaka 590-0985, Japan (12.57 km²), from a satellite image of Sep 24, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.

Sakai · AQI 53 (Moderate)

Dark green marks tree cover detected inside the study radius.Sentinel-2 L2A (ESA Copernicus) via Earth Search, captured Sep 24, 2026

Sakai's tree count comes to 5,177 trees across 10.36 km² of land, 28 points below the 30% tree-cover level considered healthy for this area, so roughly 72,483 more trees would close the gap.

Air quality detail

Air quality in Sakai today: AQI 53, Moderate

Main pollutant: PM2.5 · Observed Nov 11, 11:00 local time via Open-Meteo / CAMS, US EPA index. Values in µg/m³.

Model estimate · no ground station nearby

Health signal

Unusually sensitive people should consider limiting long outdoor exertion.

PM2.5

7.0

PM10

8.1

NO₂

18.3

O₃

68.0

SO₂

20.1

CO

222.0

Outdoor exercise
Fine for most people; unusually sensitive people should take long or hard exercise easier
Windows
Fine to open; close them if you are sensitive to pollution
Mask
Not needed for most people
Air purifier
Worth running if you are sensitive

Over the last 7 days, the CAMS air-quality model put Sakai's daily AQI at 57 on average, from 45 on Nov 10 to an hourly peak of 88 on Nov 9.

Last 7 daysavg 57 · peak 88
Nov 5: AQI 60 (peak 80)Nov 6: AQI 48 (peak 77)Nov 7: AQI 50 (peak 65)Nov 8: AQI 55 (peak 78)Nov 9: AQI 74 (peak 88)Nov 10: AQI 45 (peak 75)Nov 11: AQI 67 (peak 72)
Nov 5Nov 11

Where Sakai stands: the most polluted cities in the world right now · the cleanest

Tree cover detail

Tree cover in Sakai: Critically low

2.0% tree cover against a 30% healthy-neighborhood target, across 10.36 km² of land.

28 points below target

Trees in this area

5,177

Target trees

77,660

More trees needed

72,483

CO₂ if planted / yr

1,595 t

Deforestation · 2001–2025

How much forest has Sakai lost?

Since 2001, the area within 10 km of Sakai has lost about 3 hectares of forest (about 5 football pitches): 1.4% of the forest it had in 2000. Most of it (85%) was deforestation, forest cleared for good, mainly for towns and roads.

Satellite image of the area around Sakai, August 2017

2017: satellite photo from August 2017 of a 5 × 5 km area in the city center.

Forest lost since 2001
3 haabout 5 football pitches
Share of its forest
1.4%of what there was in 2000
Cleared for good
3 hadeforestation: turned into farms, mines or towns
Forest lost each year around Sakai, 2001–2025

Hectares of forest lost each year

Forest lost each year around Sakai, 2001–2025. Use the left and right arrow keys to read each year.0.6

Show the figures as a table
Forest lost each year around Sakai, 2001–2025
YearCleared for goodCan grow backTotal
2001under 1 haunder 1 haunder 1 ha
2002under 1 haunder 1 haunder 1 ha
2003under 1 haunder 1 haunder 1 ha
2004under 1 haunder 1 haunder 1 ha
2005under 1 haunder 1 haunder 1 ha
2006under 1 haunder 1 haunder 1 ha
2007under 1 haunder 1 haunder 1 ha
2008under 1 haunder 1 haunder 1 ha
2009under 1 haunder 1 haunder 1 ha
2010under 1 haunder 1 haunder 1 ha
2011under 1 haunder 1 haunder 1 ha
2012under 1 haunder 1 haunder 1 ha
2013under 1 haunder 1 haunder 1 ha
2014under 1 haunder 1 haunder 1 ha
2015under 1 haunder 1 haunder 1 ha
2016under 1 haunder 1 haunder 1 ha
2017under 1 haunder 1 haunder 1 ha
2018under 1 haunder 1 haunder 1 ha
2019under 1 haunder 1 haunder 1 ha
2020under 1 haunder 1 haunder 1 ha
2021under 1 haunder 1 haunder 1 ha
2022under 1 haunder 1 haunder 1 ha
2023under 1 haunder 1 haunder 1 ha
2024under 1 haunder 1 haunder 1 ha
2025under 1 haunder 1 haunder 1 ha

What is causing deforestation around Sakai?

  • Towns and roadscleared for good82% · 3 ha
  • Unknown causescause unknown18% · under 1 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
433 ha
Forest in 2020
495 ha
Overall change
+62 hamore forest than in 2000

Comparing satellite maps from 2000 and 2020, the forest around Sakai grew from about 433 hectares to 495 hectares, a net gain of about 62 hectares (+14%). New forest grew on about 69 hectares, while 6 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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Sakai air quality (AQI) and tree cover — measured by Airleaf
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Frequently asked

Questions about Sakai

What is the air quality (AQI) in Sakai right now?

The latest reading for Sakai shows an AQI of 53 (Moderate), observed Nov 11, 11:00 local time via Open-Meteo / CAMS, US EPA index. The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.

Is it safe to exercise outside in Sakai today?

At AQI 53 (Moderate): fine for most people; unusually sensitive people should take long or hard exercise easier. Windows: fine to open; close them if you are sensitive to pollution. Masks: not needed for most people. The reading changes through the day, so check again before a long run or ride.

What has the air quality in Sakai been like this week?

Over the last 7 days, the CAMS air-quality model put Sakai's daily AQI at 57 on average, from 45 on Nov 10 to an hourly peak of 88 on Nov 9. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.

How much forest has the area around Sakai lost since 2001?

Since 2001, the area within 10 km of Sakai has lost about 3 hectares of forest (about 5 football pitches): 1.4% of the forest it had in 2000. Most of it (85%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Sakai grew from about 433 hectares to 495 hectares, a net gain of about 62 hectares (+14%). New forest grew on about 69 hectares, while 6 hectares were lost.

What is the tree count in Sakai?

Sakai has an estimated 5,177 trees across the 10.36 km² of land measured — 2.0% tree cover, 28 percentage points short of the 30% tree-cover target set for this area.

How many more trees does Sakai need?

Sakai needs roughly 72,483 more trees to close a 28-point shortfall against its 30% tree-cover target — about 1,595 t of extra CO₂ absorbed per year once grown.

How are Sakai'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 5 Chome Ebisujimacho; the tree count is an estimate derived from that cover.

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