SmogRank / World / Asia / South Korea / Jeju-do
Most polluted cities in Jeju-do, South Korea
4 measured cities, last 30 days; 0 above the WHO 24-hour guideline. Worst: Seogwipo at 8.8 µg/m³, #822 in the world.
About 0 people in these 3 cities breathed unhealthy air on an average day over the last 30 days.
Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.
Cities coloured by their PM2.5 over the last 24 hours. Fires, smoke and ash: Oct 5, the newest UTC day mapped.
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, last 30 days to 6 Oct 2026, 23:00 UTC, smogrank.com/kr/region/jeju-do?w=30d.
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.