What is the air quality in Cheongju?

Cheongju, South Korea has an annual US AQI of 80 (Polluted) and average PM2.5 of 23.6 µg/m³, ranking #3788 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Cheongju?

September is typically the cleanest month (AQI 59) and March the most polluted (AQI 93).

Where does Cheongju's air quality data come from?

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

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

Cheongju Air Quality Data

Global rank	City	Continent	AQI	PM2.5
3788	Cheongju, South Korea	Asia	AQI 80	PM2.5 23.6 µg/m³