What is the air quality in Yokohama?

Yokohama, Japan has an annual US AQI of 59 (Reasonable) and average PM2.5 of 13.4 µg/m³, ranking #1917 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Yokohama?

January is typically the cleanest month (AQI 54) and July the most polluted (AQI 66).

Where does Yokohama'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.

Yokohama, Japan — Air Quality & Clean City Guide 2026

Yokohama Air Quality Data

Global rank	City	Continent	AQI	PM2.5
1917	Yokohama, Japan	Asia	AQI 59	PM2.5 13.4 µg/m³