What is the air quality in Koshigaya?

Koshigaya, Japan has an annual US AQI of 62 (Polluted) and average PM2.5 of 14 µg/m³, ranking #2328 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Koshigaya?

September is typically the cleanest month (AQI 57) and July the most polluted (AQI 82).

Where does Koshigaya's air quality data come from?

PM2.5: 1998–2025 (monitors 2013–2025, satellite 1998–2013; 2025 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

Koshigaya, Japan — Air Quality & Clean City Guide 2026

Koshigaya Air Quality Data

Global rank	City	Continent	AQI	PM2.5
2328	Koshigaya, Japan	Asia	AQI 62	PM2.5 14 µg/m³