SmogRank / World / Asia / South Korea / Sejong-si
Most polluted cities in Sejong-si, South Korea
1 measured city, this year; 1 above the WHO annual guideline. Worst: Sejong at 139.2 µg/m³, #4 in the world.
- 1Sejong 21527.8×
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
Bad-air episodes in Sejong-si
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 Sejong-si, South Korea, PM2.5, this year to 2 Oct 2026, 11:00 UTC, smogrank.com/kr/region/sejong-si?w=year.
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Updated 2026-10-02 11:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.