Worst air pollution Ueda, today and tomorrow
Today (16 July): Air quality in Ueda is fair. NO2, HCHO, and PM1 are fair; AQI and O3 are medium; PM2.5, PM10, SO2, and CO are good. Pollution peaks around 1:00 PM (O3: 55.0/100).
Tomorrow (17 July 2026): Air quality in Ueda is fair. NO2 decreases to good; PM1 decreases to good; all other pollutants stay as today. Pollution peaks around 12:00 PM (O3: 55.5/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Ueda's air quality reflects the Nagano Prefecture Chikumagawa River basin's partial enclosure between the Ueda and Tateshina mountain ranges at 430 metres, with vehicle traffic on surrounding roads and the electronics manufacturing, silk heritage, and tourism corridor contributing local sources. The surrounding Honshu Alps create significant topographic variation, while winter basin inversions create seasonal challenges and Ueda generally maintains moderate to good conditions for a major Japanese inland Nagano basin city throughout most of the year.
Today - 16 July | Pollution peaks at 13:00
AQI:
Medium
55.0/100
PM2.5 (fine particles):
Good
19.4/100
PM10 (coarse particles):
Good
5.7/100
NO2 (nitrogen dioxide):
Fair
30.4/100
O3 (ozone):
Medium
55.0/100
SO2 (sulfur dioxide):
Good
4.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Fair
21.3/100
PM1 (ultrafine particles):
Fair
23.1/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 12:00
AQI:
Medium
55.5/100
PM2.5 (fine particles):
Good
7.8/100
PM10 (coarse particles):
Good
2.1/100
NO2 (nitrogen dioxide):
Good
10.6/100
O3 (ozone):
Medium
55.5/100
SO2 (sulfur dioxide):
Good
4.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Fair
20.2/100
PM1 (ultrafine particles):
Good
10.9/100
Frequently Asked Questions
Is air quality bad in Ueda right now?
On 16 July 2026, overall air quality in Ueda is fair. NO2 is the main pollutant at 30.4/100. Pollution peaks around 1:00 PM (O3: 55.0/100).
Will air quality be worse tomorrow in Ueda?
On 17 July 2026, air quality conditions in Ueda will be similar to today, with HCHO forecast at fair at 20.2/100. Pollution peaks around 12:00 PM (O3: 55.5/100).
When is air pollution at its worst in Ueda?
In Ueda, traffic emissions, light manufacturing, together with tourism-related traffic are the main local sources, with conditions worsening when temperature inversions set in over the valley. The surrounding valley terrain holds pollutants near the surface rather than letting them disperse. The effect is strongest during the colder months, when inversions set in most often.
Are air quality levels in Ueda based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app