What is the air quality in Niihama?

Niihama, Japan has an annual US AQI of 62 (Polluted) and average PM2.5 of 14.7 µg/m³, ranking #2342 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Niihama?

December is typically the cleanest month (AQI 54) and May the most polluted (AQI 71).

Where does Niihama's air quality data come from?

PM2.5: 1998–2026 (monitors 2011–2026, satellite 1998–2011; 2025–2026 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

Niihama, Japan — Air Quality & Clean City Guide 2026

Niihama Air Quality Data

Global rank	City	Continent	AQI	PM2.5
2342	Niihama, Japan	Asia	AQI 62	PM2.5 14.7 µg/m³