What is the air quality in Koga?

Koga, Japan has an annual US AQI of 60 (Reasonable) and average PM2.5 of 13.1 µg/m³, ranking #2033 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Koga?

January is typically the cleanest month (AQI 54) and July the most polluted (AQI 81).

Where does Koga's air quality data come from?

PM2.5: 1998–2025 (monitors 2012–2025, satellite 1998–2014; 2025 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

Koga, Japan — Air Quality & Clean City Guide 2026

Koga Air Quality Data

Global rank	City	Continent	AQI	PM2.5
2033	Koga, Japan	Asia	AQI 60	PM2.5 13.1 µg/m³