What is the air quality in Seosan?

Seosan, South Korea has an annual US AQI of 75 (Polluted) and average PM2.5 of 20.6 µg/m³, ranking #3519 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Seosan?

September is typically the cleanest month (AQI 61) and June the most polluted (AQI 88).

Where does Seosan's air quality data come from?

PM2.5: 1998–2026 (monitors 2016–2026, satellite 1998–2016; 2025–2026 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

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

Seosan Air Quality Data

Global rank	City	Continent	AQI	PM2.5
3519	Seosan, South Korea	Asia	AQI 75	PM2.5 20.6 µg/m³