SmogRank / World / South Korea / Jeju-do / September 2026

Most polluted cities in Jeju-do, South Korea, September 2026

4 cities in Jeju-do, South Korea ranked by their average PM2.5 over the 30 days. Worst: Seogwipo at 9.1 µg/m³, #760 of 2,949 cities in the world. Cleanest: Gaigeturi at 7.7. A city needs measurements on 70% of the days to be ranked.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

← Seogwipo 0% 0.75%0
Every city in Jeju-do, South Korea ranked for September 2026, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1Seogwipo
    0%
  2. 2Jeju City
    0%
  3. 3Ponggae-dong
    0%
  4. 4Gaigeturi
    0%
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

All cities in the world, September 2026 · All cities in South Korea, September 2026 · Jeju-do now

Use this board

SmogRank, most polluted cities in Jeju-do, South Korea, PM2.5, September 2026, smogrank.com/kr/region/jeju-do/history/2026-09 (accessed 6 Oct 2026).

Download top 10 (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.