What is the air quality in Yachiyo?

Yachiyo, Japan has an annual US AQI of 57 (Reasonable) and average PM2.5 of 12.9 µg/m³, ranking #1684 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Yachiyo?

September is typically the cleanest month (AQI 52) and May the most polluted (AQI 63).

Where does Yachiyo's air quality data come from?

PM2.5: 1998–2026 (monitors 2014–2026, satellite 1998–2014; 2025–2026 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

Yachiyo, Japan — Air Quality & Clean City Guide 2026

Yachiyo Air Quality Data

Global rank	City	Continent	AQI	PM2.5
1684	Yachiyo, Japan	Asia	AQI 57	PM2.5 12.9 µg/m³