What is the air quality in Otaru?

Otaru, Japan has an annual US AQI of 46 (Reasonable) and average PM2.5 of 8.8 µg/m³, ranking #517 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Otaru?

September is typically the cleanest month (AQI 40) and April the most polluted (AQI 56).

Where does Otaru's air quality data come from?

PM2.5: 1998–2026 (monitors 2012–2026, satellite 1998–2012; 2025–2026 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

Otaru, Japan — Air Quality & Clean City Guide 2026

Otaru Air Quality Data

Global rank	City	Continent	AQI	PM2.5
517	Otaru, Japan	Asia	AQI 46	PM2.5 8.8 µg/m³