Worst air pollution Rittō, today and tomorrow
Today (16 July): Air quality in Rittō is fair. NO2, SO2, and PM1 are fair; AQI and O3 are medium; PM2.5, PM10, CO, and HCHO are good. Pollution peaks around 12:00 PM (O3: 56.1/100).
Tomorrow (17 July 2026): Air quality in Rittō is fair. SO2 decreases to good; all other pollutants stay as today. Pollution peaks around 4:00 PM (O3: 45.5/100). 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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Rittō's air quality benefits from its exceptional Shiga Prefecture Lake Biwa southern shoreline position, with consistent Lake Biwa breezes providing reliable natural ventilation along Japan's largest lake. Vehicle traffic on surrounding roads and the manufacturing, logistics, and residential corridor contribute local sources, while the outstanding lake ventilation and the surrounding Shiga mountains create topographic variation and Rittō generally maintains good to moderate conditions for a Japanese Shiga Prefecture lakeside industrial city throughout most of the year.
Today - 16 July | Pollution peaks at 12:00
AQI:
Medium
56.1/100
PM2.5 (fine particles):
Good
17.7/100
PM10 (coarse particles):
Good
5.3/100
NO2 (nitrogen dioxide):
Fair
30.1/100
O3 (ozone):
Medium
56.1/100
SO2 (sulfur dioxide):
Fair
23.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
9.9/100
PM1 (ultrafine particles):
Fair
21.0/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 16:00
AQI:
Medium
45.5/100
PM2.5 (fine particles):
Good
17.7/100
PM10 (coarse particles):
Good
5.9/100
NO2 (nitrogen dioxide):
Fair
22.0/100
O3 (ozone):
Medium
45.5/100
SO2 (sulfur dioxide):
Good
4.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
9.1/100
PM1 (ultrafine particles):
Fair
20.9/100
Frequently Asked Questions
Is air quality bad in Rittō right now?
On 16 July 2026, overall air quality in Rittō is fair. NO2 is the main pollutant at 30.1/100. Pollution peaks around 12:00 PM (O3: 56.1/100).
Will air quality be worse tomorrow in Rittō?
On 17 July 2026, air quality conditions in Rittō will be similar to today, with NO2 forecast at fair at 22.0/100. Pollution peaks around 4:00 PM (O3: 45.5/100).
When is air pollution at its worst in Rittō?
Air quality in Rittō tends to be worse when traffic on the surrounding roads together with manufacturing activity build up and dry, windy weather picks up. These wind events can carry dust in from the surrounding arid landscape. Such events are most common in the drier shoulder seasons.
Are air quality levels in Rittō 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