Worst air pollution Otaru, today and tomorrow
Today (16 July): Air quality in Otaru is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 4:00 AM (O3: 27.8/100).
Tomorrow (17 July 2026): Air quality in Otaru is fair. All pollutants stay as today. Pollution peaks around 3:00 PM (O3: 33.6/100). 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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Otaru's air quality benefits from its exceptional Hokkaido Sea of Japan coastal position adjacent to Ishikari Bay, with consistent Sea of Japan maritime breezes providing reliable ventilation along this famous historic port and canal city. Vehicle traffic on surrounding roads and the herring fishing legacy, tourism, and glass manufacturing corridor contribute local sources, while the outstanding coastal exposure and the Otaru canal heritage setting generally maintain Otaru among Hokkaido's more moderately ventilated coastal cities throughout most of the year.
Today - 16 July | Pollution peaks at 04:00
AQI:
Fair
27.8/100
PM2.5 (fine particles):
Good
4.7/100
PM10 (coarse particles):
Good
1.9/100
NO2 (nitrogen dioxide):
Good
6.7/100
O3 (ozone):
Fair
27.8/100
SO2 (sulfur dioxide):
Good
1.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
8.8/100
PM1 (ultrafine particles):
Good
5.1/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 15:00
AQI:
Fair
33.6/100
PM2.5 (fine particles):
Good
8.2/100
PM10 (coarse particles):
Good
4.1/100
NO2 (nitrogen dioxide):
Good
6.5/100
O3 (ozone):
Fair
33.6/100
SO2 (sulfur dioxide):
Good
1.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
8.2/100
PM1 (ultrafine particles):
Good
7.7/100
Frequently Asked Questions
Is air quality bad in Otaru right now?
On 16 July 2026, overall air quality in Otaru is fair. AQI is the main air quality indicator at 27.8/100. Pollution peaks around 4:00 AM (O3: 27.8/100).
Will air quality be worse tomorrow in Otaru?
On 17 July 2026, air quality conditions in Otaru will be similar to today, with AQI forecast at fair at 33.6/100. Pollution peaks around 3:00 PM (O3: 33.6/100).
When is air pollution at its worst in Otaru?
Otaru usually sees its poorest air quality when road traffic, heavy industrial and chemical processing, along with textile and manufacturing operations coincide with periods when the sea breeze weakens. Sea breezes typically keep conditions in check, except during still weather. Areas further inland without this ventilation tend to fare worse.
Are air quality levels in Otaru 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