Worst air pollution Iida, today and tomorrow
Today (16 July): Air quality in Iida is fair. PM2.5 and PM1 are fair; AQI, NO2, and O3 are medium; PM10, SO2, CO, and HCHO are good. Pollution peaks around 2:00 PM (O3: 45.1/100).
Tomorrow (17 July 2026): Air quality in Iida is fair. PM2.5 decreases to good; all other pollutants stay as today. Pollution peaks around 10:00 AM (O3: 54.8/100). 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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Iida's air quality reflects the Nagano Prefecture Ina Valley's partial enclosure between the Southern and Central Japanese Alps at 523 metres, with vehicle traffic on surrounding roads and the Fujitsu electronics, apple farming, and food processing corridor contributing local sources. The surrounding Honshu Alps create dramatic topographic enclosure, while winter valley inversions create seasonal challenges and summer conditions are generally excellent with clean alpine airflows throughout the warmer months.
Today - 16 July | Pollution peaks at 14:00
AQI:
Medium
45.1/100
PM2.5 (fine particles):
Fair
34.4/100
PM10 (coarse particles):
Good
10.0/100
NO2 (nitrogen dioxide):
Medium
41.8/100
O3 (ozone):
Medium
45.1/100
SO2 (sulfur dioxide):
Good
13.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
15.7/100
PM1 (ultrafine particles):
Fair
40.0/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 10:00
AQI:
Medium
54.8/100
PM2.5 (fine particles):
Good
16.3/100
PM10 (coarse particles):
Good
4.5/100
NO2 (nitrogen dioxide):
Medium
42.6/100
O3 (ozone):
Medium
54.8/100
SO2 (sulfur dioxide):
Good
6.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
19.9/100
PM1 (ultrafine particles):
Fair
21.9/100
Frequently Asked Questions
Is air quality bad in Iida right now?
On 16 July 2026, overall air quality in Iida is fair. PM1 is the main pollutant at 40.0/100. Pollution peaks around 2:00 PM (O3: 45.1/100).
Will air quality be worse tomorrow in Iida?
On 17 July 2026, air quality conditions in Iida will be similar to today, with PM1 forecast at fair at 21.9/100. Pollution peaks around 10:00 AM (O3: 54.8/100).
When is air pollution at its worst in Iida?
The biggest local contributors to pollution in Iida are traffic emissions, light manufacturing, together with agricultural activity, particularly once the surrounding valley traps air close to the ground. Topographic enclosure in the valley lets pollution accumulate rather than clear out. This is most pronounced in winter, when inversions are more frequent.
Are air quality levels in Iida 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