City report · Niigata, Japan
Niigata Air quality today
Air quality in Niigata currently reads AQI 33 (Good): Air quality is satisfactory for everyone.
AQI 33
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 6.0
- tree cover
- 7.8%
- trees in this area
- 16.7K
- more trees needed
- 47.6K
Measured across a 2 km radius around Yoriicho, Chuo Ward, Niigata, 951-8113, Japan (12.57 km²), from a satellite image of Sep 13, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Niigata · AQI 33 (Good)
Niigata's tree count comes to 16,712 trees across 8.57 km² of land, 22 points below the 30% tree-cover level considered healthy for this area, so roughly 47,565 more trees would close the gap.
Air quality detail
Air quality in Niigata today: AQI 33, Good
Main pollutant: PM2.5 · Observed Nov 12, 01:00 local time via OpenAQ and World Air Quality Index Project ground stations, US EPA index. Values in µg/m³.
Ground station · Niigata (新潟), 800 m away · median of 7 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
6.0
PM10
7.0
NO₂
10.3
O₃
—
SO₂
0.0
CO
—
Data: OpenAQ · Ministry of the Environment Air Pollutant Wide Area Monitoring System, 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)
- 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 Niigata's daily AQI at 32 on average, from 17 on Nov 5 to an hourly peak of 62 on Nov 6.
Where Niigata stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Niigata: Critically low
7.8% tree cover against a 30% healthy-neighborhood target, across 8.57 km² of land.
Trees in this area
16,712
Target trees
64,277
More trees needed
47,565
CO₂ if planted / yr
1,046 t
Deforestation · 2001–2025
How much forest has Niigata lost?
Since 2001, the area within 10 km of Niigata has lost about 10 hectares of forest (about 13 football pitches): 2.6% of the forest it had in 2000. The biggest cause was towns and roads (25%). About 2 hectares (24%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from September 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 10 haabout 13 football pitches
- Share of its forest
- 2.6%of what there was in 2000
- Cleared for good
- 2 hadeforestation: turned into farms, mines or towns
The worst year was 2002, 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 | under 1 ha | under 1 ha |
| 2002 | under 1 ha | 2 ha | 2 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | under 1 ha | 2 ha | 2 ha |
| 2005 | under 1 ha | 1 ha | 2 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 | under 1 ha | under 1 ha | under 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 Niigata?
- Towns and roadscleared for good25% · 2 ha
- Unknown causescause unknown75% · 7 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
- 131 ha
- Forest in 2020
- 157 ha
- Overall change
- +26 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Niigata grew from about 131 hectares to 157 hectares, a net gain of about 26 hectares (+20%). New forest grew on about 33 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 Niigata
What is the air quality (AQI) in Niigata right now?
The latest reading for Niigata shows an AQI of 33 (Good), measured Nov 12, 01:00 local time by 7 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Niigata (新潟), 800 m away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Niigata today?
At AQI 33 (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 Niigata been like this week?
Over the last 7 days, the CAMS air-quality model put Niigata's daily AQI at 32 on average, from 17 on Nov 5 to an hourly peak of 62 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 Niigata lost since 2001?
Since 2001, the area within 10 km of Niigata has lost about 10 hectares of forest (about 13 football pitches): 2.6% of the forest it had in 2000. The biggest cause was towns and roads (25%). About 2 hectares (24%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Niigata grew from about 131 hectares to 157 hectares, a net gain of about 26 hectares (+20%). New forest grew on about 33 hectares, while 7 hectares were lost.
What is the tree count in Niigata?
Niigata has an estimated 16,712 trees across the 8.57 km² of land measured — 7.8% tree cover, 22 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Niigata need?
Niigata needs roughly 47,565 more trees to close a 22-point shortfall against its 30% tree-cover target — about 1,046 t of extra CO₂ absorbed per year once grown.
How are Niigata's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Yoriicho, 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 Yoriicho; the tree count is an estimate derived from that cover.
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