What is the air quality in Ulsan?

Ulsan, South Korea has an annual US AQI of 72 (Polluted) and average PM2.5 of 20.1 µg/m³, ranking #3364 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Ulsan?

September is typically the cleanest month (AQI 58) and May the most polluted (AQI 86).

Where does Ulsan'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.

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

Ulsan Air Quality Data

Global rank	City	Continent	AQI	PM2.5
3364	Ulsan, South Korea	Asia	AQI 72	PM2.5 20.1 µg/m³