SmogRank / World / Asia / South Korea
Most polluted cities in South Korea
No city in South Korea has enough readings to rank for the last 24 hours.
A city joins the 24-hour ranking with 18 hours of readings in the last 24; none here has that right now, so there is nothing to map or chart.
Last 7 days: 134 measured cities · Last 30 days: 132 measured cities · This year: 136 measured cities
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
South Korea 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 |
|---|---|
| Gunpo | ≈ 23 µg/m³ |
| Kyosai | ≈ 8 µg/m³ |
| Uiwang | ≈ 23 µg/m³ |
| Tallang-dong | ≈ 8 µg/m³ |
| Seodong | ≈ 8 µg/m³ |
| Ara-dong | ≈ 9 µg/m³ |
| Heunghae | ≈ 12 µg/m³ |
| Jenzan | ≈ 14 µg/m³ |
| Ora-dong | ≈ 8 µg/m³ |
Bad-air episodes in South Korea
Times when many cities here had PM2.5 at twice their usual or more on the same days.
Regions
Measured cities in each region, last 7 days.
Updated 2026-10-02 09:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.