Worst air pollution Nagahama, today and tomorrow
Today (10 August): Air quality in Nagahama is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 AM (O3: 34.4/100).
Tomorrow (11 August 2026): Air quality in Nagahama is fair. All 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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Nagahama's air quality benefits from its exceptional Shiga Prefecture Lake Biwa northern shoreline position, with consistent lake breezes providing reliable natural ventilation. Vehicle traffic on surrounding roads and the traditional Kurokabe district tourism, agricultural, and manufacturing corridor contribute local sources, while the outstanding lake ventilation and the surrounding Ibuki and Kohoku mountains create topographic variation and Nagahama generally maintains good to moderate conditions for a major 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
10.3/100
PM10 (coarse particles):
Good
3.1/100
NO2 (nitrogen dioxide):
Good
16.6/100
O3 (ozone):
Fair
34.4/100
SO2 (sulfur dioxide):
Good
6.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
10.3/100
PM1 (ultrafine particles):
Good
12.2/100
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
5.5/100
PM10 (coarse particles):
Good
2.1/100
NO2 (nitrogen dioxide):
Good
6.3/100
O3 (ozone):
Fair
32.8/100
SO2 (sulfur dioxide):
Good
2.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.0/100
PM1 (ultrafine particles):
Good
4.1/100
Frequently Asked Questions
Is air quality bad in Nagahama right now?
On 10 August 2026, overall air quality in Nagahama 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 Nagahama?
On 11 August 2026, air quality conditions in Nagahama 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 Nagahama?
The biggest local contributors to pollution in Nagahama are vehicle traffic, manufacturing and food processing, and farming and agricultural processing, particularly once winds are light and dispersion is poor. Background emissions and local weather both shape how conditions change from day to day. Background emissions and local weather both play a role in day-to-day changes.
Are air quality levels in Nagahama 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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