Worst air pollution Kusatsu, today and tomorrow
Today (16 July): Air quality in Kusatsu is fair. NO2 and PM1 are fair; AQI and O3 are medium; PM2.5, PM10, SO2, CO, and HCHO are good. Pollution peaks around 12:00 PM (O3: 56.1/100).
Tomorrow (17 July 2026): Air quality in Kusatsu is fair. NO2 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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Kusatsu's air quality benefits from its exceptional Shiga Prefecture Lake Biwa shoreline position adjacent to Japan's largest lake, with consistent lake breezes providing reliable natural ventilation. Vehicle traffic on surrounding roads and the manufacturing, university, and residential corridor contribute local sources, while the outstanding lake ventilation and the Hiei Mountain backdrop create distinctive topographic variation and Kusatsu generally maintains moderate to good conditions for a major Japanese lakeside city throughout most of the year.
Today - 16 July | Pollution peaks at 12:00
AQI:
Medium
56.1/100
PM2.5 (fine particles):
Good
16.8/100
PM10 (coarse particles):
Good
5.0/100
NO2 (nitrogen dioxide):
Fair
26.2/100
O3 (ozone):
Medium
56.1/100
SO2 (sulfur dioxide):
Good
19.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
9.9/100
PM1 (ultrafine particles):
Fair
20.2/100
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
16.7/100
PM10 (coarse particles):
Good
5.6/100
NO2 (nitrogen dioxide):
Good
19.1/100
O3 (ozone):
Medium
45.5/100
SO2 (sulfur dioxide):
Good
4.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
9.1/100
PM1 (ultrafine particles):
Fair
20.1/100
Frequently Asked Questions
Is air quality bad in Kusatsu right now?
On 16 July 2026, overall air quality in Kusatsu is fair. NO2 is the main pollutant at 26.2/100. Pollution peaks around 12:00 PM (O3: 56.1/100).
Will air quality be worse tomorrow in Kusatsu?
On 17 July 2026, air quality conditions in Kusatsu will be similar to today, with PM1 forecast at fair at 20.1/100. Pollution peaks around 4:00 PM (O3: 45.5/100).
When is air pollution at its worst in Kusatsu?
In Kusatsu, traffic on the surrounding roads together with textile and manufacturing operations are the main local sources, with conditions worsening when still air allows pollutants to build up. 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 Kusatsu 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