City report · Saga, Japan
Saga Air quality today
Air quality in Saga currently reads AQI 29 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 29
Good
- PM2.5, fine particles (µg/m³)
- 4.0
- tree cover
- 4.5%
- trees in this area
- 14.1K
- more trees needed
- 79.9K
Measured across a 2 km radius around Suetsugu Honjomachi, Saga, 840-0024, Japan (12.57 km²), from a satellite image of Sep 22, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Saga · AQI 29 (Good)
Saga's tree count comes to 14,095 trees across 12.53 km² of land, 26 points below the 30% tree-cover level considered healthy for this area, so roughly 79,870 more trees would close the gap.
Air quality detail
Air quality in Saga today: AQI 29, Good
Main pollutant: PM2.5 · Observed Nov 11, 11:00 local time via Open-Meteo / CAMS, corrected with 4 ground-station cities within 245 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 4 station cities within 245 km, e.g. Kasuga and Fukuoka
Health signal
Air quality is satisfactory for everyone.
PM2.5
4.0
PM10
17.9
NO₂
15.2
O₃
53.0
SO₂
10.6
CO
187.0
- 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 Saga's daily AQI at 49 on average, from 27 on Nov 10 to an hourly peak of 82 on Nov 11.
Where Saga stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Saga: Critically low
4.5% tree cover against a 30% healthy-neighborhood target, across 12.53 km² of land.
Trees in this area
14,095
Target trees
93,965
More trees needed
79,870
CO₂ if planted / yr
1,757 t
Deforestation · 2001–2025
How much forest has Saga lost?
Since 2001, the area within 10 km of Saga has lost about 6 hectares of forest (about 8 football pitches): 3.7% of the forest it had in 2000. The biggest cause was farms, pasture and plantations (23%). About 3 hectares (46%) was deforestation: forest cleared for good for farms, mines or towns.
2018: satellite photo from June 2018 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 6 haabout 8 football pitches
- Share of its forest
- 3.7%of what there was in 2000
- Cleared for good
- 3 hadeforestation: turned into farms, mines or towns
The worst year was 2001, when about 2 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 | under 1 ha | 2 ha | 2 ha |
| 2002 | under 1 ha | under 1 ha | under 1 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | under 1 ha | under 1 ha | under 1 ha |
| 2005 | under 1 ha | under 1 ha | under 1 ha |
| 2006 | under 1 ha | under 1 ha | under 1 ha |
| 2007 | under 1 ha | under 1 ha | under 1 ha |
| 2008 | under 1 ha | under 1 ha | under 1 ha |
| 2009 | under 1 ha | under 1 ha | under 1 ha |
| 2010 | under 1 ha | under 1 ha | under 1 ha |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | under 1 ha | under 1 ha | under 1 ha |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | under 1 ha | under 1 ha | under 1 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | under 1 ha | under 1 ha | under 1 ha |
| 2017 | under 1 ha | under 1 ha | under 1 ha |
| 2018 | under 1 ha | under 1 ha | under 1 ha |
| 2019 | under 1 ha | under 1 ha | under 1 ha |
| 2020 | under 1 ha | under 1 ha | under 1 ha |
| 2021 | 1 ha | under 1 ha | 1 ha |
| 2022 | under 1 ha | under 1 ha | under 1 ha |
| 2023 | under 1 ha | under 1 ha | under 1 ha |
| 2024 | under 1 ha | under 1 ha | under 1 ha |
| 2025 | under 1 ha | under 1 ha | under 1 ha |
What is causing deforestation around Saga?
- Farms, pasture and plantationscleared for good23% · 1 ha
- Towns and roadscleared for good21% · 1 ha
- Unknown causescause unknown50% · 3 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
- 139 ha
- Forest in 2020
- 155 ha
- Overall change
- +16 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Saga grew from about 139 hectares to 155 hectares, a net gain of about 16 hectares (+12%). New forest grew on about 23 hectares, while 7 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 Saga
What is the air quality (AQI) in Saga right now?
The latest reading for Saga shows an AQI of 29 (Good), observed Nov 11, 11:00 local time via Open-Meteo / CAMS, corrected with 4 ground-station cities within 245 km, US EPA index. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Saga today?
At AQI 29 (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 Saga been like this week?
Over the last 7 days, the CAMS air-quality model put Saga's daily AQI at 49 on average, from 27 on Nov 10 to an hourly peak of 82 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 Saga lost since 2001?
Since 2001, the area within 10 km of Saga has lost about 6 hectares of forest (about 8 football pitches): 3.7% of the forest it had in 2000. The biggest cause was farms, pasture and plantations (23%). About 3 hectares (46%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Saga grew from about 139 hectares to 155 hectares, a net gain of about 16 hectares (+12%). New forest grew on about 23 hectares, while 7 hectares were lost.
What is the tree count in Saga?
Saga has an estimated 14,095 trees across the 12.53 km² of land measured — 4.5% tree cover, 26 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Saga need?
Saga needs roughly 79,870 more trees to close a 26-point shortfall against its 30% tree-cover target — about 1,757 t of extra CO₂ absorbed per year once grown.
How are Saga'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 Suetsugu Honjomachi; the tree count is an estimate derived from that cover.
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