What is the air quality in Muroran?

Muroran, Japan has an annual US AQI of 51 (Reasonable) and average PM2.5 of 10.6 µg/m³, ranking #898 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Muroran?

December is typically the cleanest month (AQI 46) and April the most polluted (AQI 60).

Where does Muroran's air quality data come from?

PM2.5: 1998–2026 (monitors 2012–2026, satellite 1998–2012, 2016; 2025–2026 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

Muroran, Japan — Air Quality & Clean City Guide 2026

Muroran Air Quality Data

Global rank	City	Continent	AQI	PM2.5
898	Muroran, Japan	Asia	AQI 51	PM2.5 10.6 µg/m³