City report · Niigata, Japan
Nagaoka Air quality today
Air quality in Nagaoka currently reads AQI 8 (Good): Air quality is satisfactory for everyone.
AQI 8
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 1.6
- tree cover
- 11.8%
- trees in this area
- 35.3K
- more trees needed
- 54.4K
Measured across a 2 km radius around 2 Chome Sakanouemachi, Nagaoka, Niigata 940-0065, Japan (12.57 km²), from a satellite image of Sep 23, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Nagaoka · AQI 8 (Good)
Nagaoka's tree count comes to 35,291 trees across 11.97 km² of land, 18 points below the 30% tree-cover level considered healthy for this area, so roughly 54,432 more trees would close the gap.
Air quality detail
Air quality in Nagaoka today: AQI 8, Good
Main pollutant: PM2.5 · Observed Nov 11, 11:00 local time via Open-Meteo / CAMS, corrected with 47 ground-station cities within 205 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 47 station cities within 205 km, e.g. Niigata and Joetsu
Health signal
Air quality is satisfactory for everyone.
PM2.5
1.6
PM10
10.6
NO₂
3.0
O₃
79.0
SO₂
2.3
CO
155.0
- 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 Nagaoka's daily AQI at 33 on average, from 26 on Nov 5 to an hourly peak of 61 on Nov 6.
Where Nagaoka stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Nagaoka: Critically low
11.8% tree cover against a 30% healthy-neighborhood target, across 11.97 km² of land.
Trees in this area
35,291
Target trees
89,723
More trees needed
54,432
CO₂ if planted / yr
1,198 t
Deforestation · 2001–2025
How much forest has Nagaoka lost?
Since 2001, the area within 10 km of Nagaoka has lost about 72 hectares of forest (about 100 football pitches): under 1% of the forest it had in 2000. The biggest cause was towns and roads (41%). About 31 hectares (43%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from July 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 72 haabout 100 football pitches
- Share of its forest
- under 1%of what there was in 2000
- Cleared for good
- 31 hadeforestation: turned into farms, mines or towns
The worst year was 2005, when about 8 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 | under 1 ha | 1 ha |
| 2002 | 4 ha | 3 ha | 7 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | 2 ha | 2 ha | 3 ha |
| 2005 | 2 ha | 6 ha | 8 ha |
| 2006 | under 1 ha | under 1 ha | 1 ha |
| 2007 | 1 ha | 4 ha | 5 ha |
| 2008 | 2 ha | 3 ha | 5 ha |
| 2009 | 1 ha | 2 ha | 3 ha |
| 2010 | 2 ha | 4 ha | 6 ha |
| 2011 | under 1 ha | 3 ha | 3 ha |
| 2012 | 3 ha | 2 ha | 5 ha |
| 2013 | 3 ha | under 1 ha | 4 ha |
| 2014 | under 1 ha | under 1 ha | under 1 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | 1 ha | under 1 ha | 2 ha |
| 2017 | under 1 ha | 2 ha | 2 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 | 1 ha |
| 2021 | under 1 ha | under 1 ha | under 1 ha |
| 2022 | under 1 ha | under 1 ha | under 1 ha |
| 2023 | 4 ha | under 1 ha | 4 ha |
| 2024 | under 1 ha | 3 ha | 3 ha |
| 2025 | 2 ha | 5 ha | 7 ha |
What is causing deforestation around Nagaoka?
- Towns and roadscleared for good41% · 30 ha
- Loggingcan grow back27% · 19 ha
- Farms, pasture and plantationscleared for good1.2% · under 1 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
- 9,380 ha
- Forest in 2020
- 9,420 ha
- Overall change
- +39 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Nagaoka stayed about the same size, at about 9,420 hectares: new forest grew on about 137 hectares, and about 98 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
In the same region
Measured cities near Nagaoka
Same 2 km radius, same index — so they compare directly.
- Niigata55.2 km
Japan
- Tree cover
- 8%
- Air quality
- 39
- Jōetsu63.8 km
Japan
- Tree cover
- 10%
- Air quality
- 28
- Aizu-Wakamatsu96.8 km
Japan
- Tree cover
- 45%
- Air quality
- 8
- Nagano106.8 km
Japan
- Tree cover
- 26%
- Air quality
- 23
- Maebashi118.6 km
Japan
- Tree cover
- 4%
- Air quality
- 33
- Nasushiobara119.9 km
Japan
- Tree cover
- 44%
- Air quality
- 5
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Frequently asked
Questions about Nagaoka
What is the air quality (AQI) in Nagaoka right now?
The latest reading for Nagaoka shows an AQI of 8 (Good), observed Nov 11, 11:00 local time via Open-Meteo / CAMS, corrected with 47 ground-station cities within 205 km, US EPA index. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Nagaoka today?
At AQI 8 (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 Nagaoka been like this week?
Over the last 7 days, the CAMS air-quality model put Nagaoka's daily AQI at 33 on average, from 26 on Nov 5 to an hourly peak of 61 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 Nagaoka lost since 2001?
Since 2001, the area within 10 km of Nagaoka has lost about 72 hectares of forest (about 100 football pitches): under 1% of the forest it had in 2000. The biggest cause was towns and roads (41%). About 31 hectares (43%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Nagaoka stayed about the same size, at about 9,420 hectares: new forest grew on about 137 hectares, and about 98 hectares were lost.
What is the tree count in Nagaoka?
Nagaoka has an estimated 35,291 trees across the 11.97 km² of land measured — 11.8% tree cover, 18 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Nagaoka need?
Nagaoka needs roughly 54,432 more trees to close a 18-point shortfall against its 30% tree-cover target — about 1,198 t of extra CO₂ absorbed per year once grown.
How are Nagaoka'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 2 Chome Sakanouemachi; the tree count is an estimate derived from that cover.
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