Worst air pollution Hikone, today and tomorrow
Today (16 July): Air quality in Hikone is poor. AQI and O3 are poor; NO2 and PM1 are fair; PM2.5, PM10, SO2, CO, and HCHO are good. Pollution peaks around 12:00 PM (O3: 61.4/100).
Tomorrow (17 July 2026): Air quality in Hikone is poor. All pollutants stay as today. Pollution peaks around 5:00 PM (O3: 67.9/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Hikone's air quality benefits from its exceptional Shiga Prefecture Lake Biwa eastern shoreline position adjacent to the historic Hikone Castle, with consistent Lake Biwa breezes providing reliable natural ventilation. Vehicle traffic on surrounding roads and the traditional crafts, manufacturing, and castle tourism corridor contribute local sources, while the outstanding lake ventilation and the Ibuki Mountain backdrop create topographic variation and Hikone generally maintains good to moderate conditions for a Japanese lakeside heritage city throughout most of the year.
Today - 16 July | Pollution peaks at 12:00
AQI:
Poor
61.4/100
PM2.5 (fine particles):
Good
18.5/100
PM10 (coarse particles):
Good
5.5/100
NO2 (nitrogen dioxide):
Fair
33.7/100
O3 (ozone):
Poor
61.4/100
SO2 (sulfur dioxide):
Good
16.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
9.9/100
PM1 (ultrafine particles):
Fair
21.8/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 17:00
AQI:
Poor
67.9/100
PM2.5 (fine particles):
Good
17.8/100
PM10 (coarse particles):
Good
5.1/100
NO2 (nitrogen dioxide):
Fair
23.4/100
O3 (ozone):
Poor
67.9/100
SO2 (sulfur dioxide):
Good
8.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
9.0/100
PM1 (ultrafine particles):
Fair
22.4/100
Frequently Asked Questions
Is air quality bad in Hikone right now?
On 16 July 2026, overall air quality in Hikone is poor. AQI is the main air quality indicator at 61.4/100. Pollution peaks around 12:00 PM (O3: 61.4/100).
Will air quality be worse tomorrow in Hikone?
On 17 July 2026, air quality conditions in Hikone will be similar to today, with AQI forecast at poor at 67.9/100. Pollution peaks around 5:00 PM (O3: 67.9/100).
When is air pollution at its worst in Hikone?
Pollution in Hikone typically rises when vehicle traffic, manufacturing and food processing, as well as seasonal tourism traffic combine, especially once winds are light and dispersion is poor. Local weather patterns add further variation on top of these sources. Background emissions and local weather both play a role in day-to-day changes.
Are air quality levels in Hikone 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