SmogRank / World / Asia / South Korea / Jeju-do
Most polluted cities in Jeju-do, South Korea
4 measured cities, this year; 4 above the WHO annual guideline. Worst: Jeju City at 12.9 µg/m³, #665 in the world.
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.
Cities coloured by their PM2.5 over the last 24 hours. Fires, smoke and ash: Oct 5, the newest UTC day mapped.
- 1Ponggae-dong 2%
- 2Jeju City 2%
- 3Seogwipo 0%
- 4Gaigeturi 0%
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
Estimated: cities without a monitor
Jeju-do cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.
| City | 7-day estimate |
|---|---|
| Tallang-dong | ≈ 8 µg/m³ |
| Seodong | ≈ 8 µg/m³ |
| Ara-dong | ≈ 8 µg/m³ |
| Ora-dong | ≈ 8 µg/m³ |
Bad-air episodes in Jeju-do
- South Korea, 2 May 20261 day59 cities52 µg/m³peak, Goyang-si
- South Korea, 11 to 12 April 20262 days13 cities45 µg/m³peak, Yŏnmu
- Japan and South Korea, March 202623 to 31 March 2026, 9 days322 cities86 µg/m³peak, Pohang
- South Korea, 15 to 18 March 20264 days100 cities68 µg/m³peak, Seonghwan
- South Korea, 9 to 12 March 20264 days89 cities59 µg/m³peak, Gumi
- South Korea and Japan, 19 to 21 February 20263 days52 cities48 µg/m³peak, Yeongju
Times when many cities around here had PM2.5 at twice their usual or more on the same days.
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SmogRank, most polluted cities in Jeju-do, South Korea, PM2.5, this year to 6 Oct 2026, 23:00 UTC, smogrank.com/kr/region/jeju-do?w=year.
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.
Updated 2026-10-06 23:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.