What is the air quality in Daejeon?

Daejeon, South Korea has an annual US AQI of 75 (Polluted) and average PM2.5 of 20.8 µg/m³, ranking #3520 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Daejeon?

September is typically the cleanest month (AQI 56) and June the most polluted (AQI 86).

Where does Daejeon's air quality data come from?

PM2.5: 1998–2026 (monitors 2015–2026, satellite 1998–2014; 2025–2026 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

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

Daejeon Air Quality Data

Global rank	City	Continent	AQI	PM2.5
3520	Daejeon, South Korea	Asia	AQI 75	PM2.5 20.8 µg/m³