City report · Nagano, Japan
Ueda Air quality today
Air quality in Ueda currently reads AQI 17 (Good): Air quality is satisfactory for everyone.
AQI 17
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 3.0
- tree cover
- 18.1%
- trees in this area
- 56.9K
- more trees needed
- 37.4K
Measured across a 2 km radius around Kosato, Ueda, Nagano 386-0005, Japan (12.57 km²), from a satellite image of Sep 1, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Ueda · AQI 17 (Good)
Ueda's tree count comes to 56,863 trees across 12.57 km², 12 points below the 30% tree-cover level considered healthy for this area, so roughly 37,385 more trees would close the gap.
Air quality detail
Air quality in Ueda today: AQI 17, Good
Main pollutant: PM2.5 · Observed Nov 12, 01:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · 上田市材木町１－２－６, 1.8 km away
Health signal
Air quality is satisfactory for everyone.
PM2.5
3.0
PM10
—
NO₂
16.9
O₃
—
SO₂
—
CO
—
Data: OpenAQ · Ministry of the Environment Air Pollutant Wide Area Monitoring System
- 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 Ueda's daily AQI at 25 on average, from 12 on Nov 7 to an hourly peak of 81 on Nov 6.
Where Ueda stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Ueda: Below target
18.1% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
56,863
Target trees
94,248
More trees needed
37,385
CO₂ if planted / yr
822.5 t
Deforestation · 2001–2025
How much forest has Ueda lost?
Since 2001, the area within 10 km of Ueda has lost about 744 hectares of forest (about 1,000 football pitches): 4.4% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 36 hectares (4.8%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from July 2017 of a 5 × 5 km area about 7 km east of the city center.
- Forest lost since 2001
- 744 haabout 1,000 football pitches
- Share of its forest
- 4.4%of what there was in 2000
- Cleared for good
- 36 hadeforestation: turned into farms, mines or towns
The worst year was 2019, when about 58 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 | 14 ha | 14 ha |
| 2002 | under 1 ha | 10 ha | 10 ha |
| 2003 | 1 ha | 5 ha | 6 ha |
| 2004 | under 1 ha | 10 ha | 11 ha |
| 2005 | 3 ha | 26 ha | 29 ha |
| 2006 | under 1 ha | 16 ha | 16 ha |
| 2007 | 2 ha | 33 ha | 35 ha |
| 2008 | under 1 ha | 16 ha | 16 ha |
| 2009 | under 1 ha | 45 ha | 46 ha |
| 2010 | 1 ha | 29 ha | 30 ha |
| 2011 | under 1 ha | 13 ha | 13 ha |
| 2012 | 1 ha | 43 ha | 45 ha |
| 2013 | under 1 ha | 10 ha | 10 ha |
| 2014 | under 1 ha | 17 ha | 17 ha |
| 2015 | under 1 ha | 15 ha | 15 ha |
| 2016 | under 1 ha | 21 ha | 21 ha |
| 2017 | 12 ha | 41 ha | 53 ha |
| 2018 | 1 ha | 52 ha | 53 ha |
| 2019 | under 1 ha | 57 ha | 58 ha |
| 2020 | under 1 ha | 44 ha | 44 ha |
| 2021 | under 1 ha | 49 ha | 49 ha |
| 2022 | under 1 ha | 52 ha | 52 ha |
| 2023 | 2 ha | 48 ha | 50 ha |
| 2024 | 2 ha | 17 ha | 19 ha |
| 2025 | 6 ha | 27 ha | 33 ha |
What is causing deforestation around Ueda?
- Loggingcan grow back92% · 688 ha
- Farms, pasture and plantationscleared for good3.2% · 24 ha
- Towns and roadscleared for good1.6% · 12 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
- 17,200 ha
- Forest in 2020
- 17,100 ha
- Overall change
- −98 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Ueda stayed about the same size, at about 17,100 hectares: new forest grew on about 100 hectares, and about 198 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 Ueda
Same 2 km radius, same index — so they compare directly.
Build your own
Compare Ueda with anywhere
This place
Ueda
Use this data
Put Ueda's numbers on your site
Free to embed. Updates itself as the measurement refreshes.
Frequently asked
Questions about Ueda
What is the air quality (AQI) in Ueda right now?
The latest reading for Ueda shows an AQI of 17 (Good), measured Nov 12, 01:00 local time by the 上田市材木町１－２－６ ground monitoring station, 1.8 km away, via OpenAQ. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Ueda today?
At AQI 17 (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 Ueda been like this week?
Over the last 7 days, the CAMS air-quality model put Ueda's daily AQI at 25 on average, from 12 on Nov 7 to an hourly peak of 81 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 Ueda lost since 2001?
Since 2001, the area within 10 km of Ueda has lost about 744 hectares of forest (about 1,000 football pitches): 4.4% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 36 hectares (4.8%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Ueda stayed about the same size, at about 17,100 hectares: new forest grew on about 100 hectares, and about 198 hectares were lost.
What is the tree count in Ueda?
Ueda has an estimated 56,863 trees across the 12.57 km² measured — 18.1% tree cover, 12 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Ueda need?
Ueda needs roughly 37,385 more trees to close a 12-point shortfall against its 30% tree-cover target — about 822.5 t of extra CO₂ absorbed per year once grown.
How are Ueda's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Kosato, 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 Kosato; the tree count is an estimate derived from that cover.
See your own area
What does your neighborhood look like?
Pick any point and radius to get the same air-quality and tree-cover breakdown.
Check my address