Worst air pollution Hikone, today and tomorrow
Today (10 August): Air quality in Hikone is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 AM (O3: 34.4/100).
Tomorrow (11 August 2026): Air quality in Hikone is fair. NO2 decreases to good; all other pollutants stay as today. Pollution peaks around 2:00 PM (O3: 32.8/100). 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 - 10 August | Pollution peaks at 11:00
AQI:
Fair
34.4/100
PM2.5 (fine particles):
Good
11.5/100
PM10 (coarse particles):
Good
3.5/100
NO2 (nitrogen dioxide):
Fair
24.3/100
O3 (ozone):
Fair
34.4/100
SO2 (sulfur dioxide):
Good
10.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
10.3/100
PM1 (ultrafine particles):
Good
13.6/100
Levels show the poorest local air quality during the day
Tomorrow - 11 August | Pollution peaks at 14:00
AQI:
Fair
32.8/100
PM2.5 (fine particles):
Good
6.2/100
PM10 (coarse particles):
Good
2.3/100
NO2 (nitrogen dioxide):
Good
9.8/100
O3 (ozone):
Fair
32.8/100
SO2 (sulfur dioxide):
Good
3.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.0/100
PM1 (ultrafine particles):
Good
4.6/100
Frequently Asked Questions
Is air quality bad in Hikone right now?
On 10 August 2026, overall air quality in Hikone is fair. AQI is the main air quality indicator at 34.4/100. Pollution peaks around 11:00 AM (O3: 34.4/100).
Will air quality be worse tomorrow in Hikone?
On 11 August 2026, air quality conditions in Hikone will be similar to today, with AQI forecast at fair at 32.8/100. Pollution peaks around 2:00 PM (O3: 32.8/100).
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.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 9 August 2026 at 20:27 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.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
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