SmogRank / World / Asia / South Korea / Ulsan

Most polluted cities in Ulsan, South Korea

1 measured city, last 30 days; 1 above the WHO 24-hour guideline. Worst: Ulsan at 23.7 µg/m³, #307 in the world.

Busan: 2 measured citiesGyeongsangbuk-do: 16 measured citiesGyeongsangnam-do: 13 measured citiesUlsan: 1 measured city#1 Ulsan: 23.7 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
  1. 1Ulsan 78
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

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SmogRank, most polluted cities in Ulsan, South Korea, PM2.5, last 30 days to 2 Oct 2026, 07:00 UTC, smogrank.com/kr/region/ulsan?w=30d.

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Updated 2026-10-02 07:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.