City report · Fukuoka, Japan
Kasuga Air quality today
Air quality in Kasuga currently reads AQI 40 (Good): Air quality is satisfactory for everyone.
AQI 40
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 7.2
- tree cover
- 10.5%
- trees in this area
- 32.6K
- more trees needed
- 60.5K
Measured across a 2 km radius around 2 Chome Wakabadaihigashi, Kasuga, Fukuoka 816-0821, Japan (12.57 km²), from a satellite image of Aug 23, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Kasuga · AQI 40 (Good)
Kasuga's tree count comes to 32,591 trees across 12.42 km² of land, 20 points below the 30% tree-cover level considered healthy for this area, so roughly 60,526 more trees would close the gap.
Air quality detail
Air quality in Kasuga today: AQI 40, Good
Main pollutant: PM2.5 · Observed Nov 11, 23:00 local time via World Air Quality Index Project ground stations, US EPA index. Values in µg/m³.
Ground station · Saifu, Dazaifu, Fukuoka, Japan (太宰府太宰府市), 6.6 km away
Health signal
Air quality is satisfactory for everyone.
PM2.5
7.2
PM10
8.6
NO₂
—
O₃
—
SO₂
—
CO
—
Data: World Air Quality Index Project, Japan Atmospheric Environmental Regional Observation System (環境省大気汚染物質広域監視システム), Fukuoka Institute of Health and Environmental Sciences (福岡県保健環境研究所 )
- 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 Kasuga's daily AQI at 48 on average, from 29 on Nov 10 to an hourly peak of 87 on Nov 11.
Where Kasuga stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Kasuga: Critically low
10.5% tree cover against a 30% healthy-neighborhood target, across 12.42 km² of land.
Trees in this area
32,591
Target trees
93,117
More trees needed
60,526
CO₂ if planted / yr
1,332 t
Deforestation · 2001–2025
How much forest has Kasuga lost?
Since 2001, the area within 10 km of Kasuga has lost about 598 hectares of forest (about 840 football pitches): 5.1% of the forest it had in 2000. Most of it (51%) was deforestation, forest cleared for good, mainly for towns and roads.
2018: satellite photo from August 2018 of a 5 × 5 km area about 6 km south of the city center.
- Forest lost since 2001
- 598 haabout 840 football pitches
- Share of its forest
- 5.1%of what there was in 2000
- Cleared for good
- 302 hadeforestation: turned into farms, mines or towns
The worst year was 2007, when about 52 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 | 32 ha | 8 ha | 40 ha |
| 2002 | 6 ha | 2 ha | 8 ha |
| 2003 | 10 ha | 8 ha | 18 ha |
| 2004 | 18 ha | 9 ha | 27 ha |
| 2005 | 21 ha | 10 ha | 30 ha |
| 2006 | 24 ha | 5 ha | 29 ha |
| 2007 | 37 ha | 14 ha | 52 ha |
| 2008 | 6 ha | 4 ha | 10 ha |
| 2009 | 14 ha | 9 ha | 23 ha |
| 2010 | 8 ha | 11 ha | 19 ha |
| 2011 | 13 ha | 3 ha | 16 ha |
| 2012 | 6 ha | 2 ha | 8 ha |
| 2013 | 5 ha | under 1 ha | 5 ha |
| 2014 | 16 ha | 1 ha | 17 ha |
| 2015 | 6 ha | 4 ha | 11 ha |
| 2016 | 8 ha | 8 ha | 15 ha |
| 2017 | 5 ha | 14 ha | 18 ha |
| 2018 | 5 ha | 31 ha | 36 ha |
| 2019 | 13 ha | 14 ha | 27 ha |
| 2020 | 16 ha | 12 ha | 28 ha |
| 2021 | 13 ha | 22 ha | 35 ha |
| 2022 | 5 ha | 19 ha | 24 ha |
| 2023 | 4 ha | 21 ha | 25 ha |
| 2024 | 7 ha | 26 ha | 33 ha |
| 2025 | 5 ha | 40 ha | 45 ha |
What is causing deforestation around Kasuga?
- Towns and roadscleared for good48% · 285 ha
- Loggingcan grow back46% · 276 ha
- Mining and energycleared for good2.8% · 17 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
- 13,000 ha
- Forest in 2020
- 12,900 ha
- Overall change
- −128 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Kasuga stayed about the same size, at about 12,900 hectares: new forest grew on about 120 hectares, and about 247 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 Kasuga
What is the air quality (AQI) in Kasuga right now?
The latest reading for Kasuga shows an AQI of 40 (Good), measured Nov 11, 23:00 local time by the Saifu, Dazaifu, Fukuoka, Japan (太宰府太宰府市) ground monitoring station, 6.6 km away, via OpenAQ. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Kasuga today?
At AQI 40 (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 Kasuga been like this week?
Over the last 7 days, the CAMS air-quality model put Kasuga's daily AQI at 48 on average, from 29 on Nov 10 to an hourly peak of 87 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 Kasuga lost since 2001?
Since 2001, the area within 10 km of Kasuga has lost about 598 hectares of forest (about 840 football pitches): 5.1% of the forest it had in 2000. Most of it (51%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Kasuga stayed about the same size, at about 12,900 hectares: new forest grew on about 120 hectares, and about 247 hectares were lost.
What is the tree count in Kasuga?
Kasuga has an estimated 32,591 trees across the 12.42 km² of land measured — 10.5% tree cover, 20 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Kasuga need?
Kasuga needs roughly 60,526 more trees to close a 20-point shortfall against its 30% tree-cover target — about 1,332 t of extra CO₂ absorbed per year once grown.
How are Kasuga's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near 2 Chome Wakabadaihigashi, 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 2 Chome Wakabadaihigashi; the tree count is an estimate derived from that cover.
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