What is the air quality in Osan?

Osan, South Korea has an annual US AQI of 81 (Polluted) and average PM2.5 of 23.9 µg/m³, ranking #3833 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Osan?

September is typically the cleanest month (AQI 60) and March the most polluted (AQI 98).

Where does Osan's air quality data come from?

PM2.5: 1998–2026 (monitors 2017–2026, satellite 1998–2017; 2025–2026 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

Osan, South Korea — Air Quality & Clean City Guide 2026

Osan Air Quality Data

Global rank	City	Continent	AQI	PM2.5
3833	Osan, South Korea	Asia	AQI 81	PM2.5 23.9 µg/m³