SmogRank / World / Asia / South Korea / Daejeon

Most polluted cities in Daejeon, South Korea

1 measured city, last 30 days; 1 above the WHO 24-hour guideline. Worst: Daejeon at 23.3 µg/m³, #316 in the world.

Chungcheongnam-do: 13 measured citiesDaejeon: 1 measured cityNorth Chungcheong: 7 measured cities#1 Daejeon: 23.3 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
  1. 1Daejeon 23.3
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

PM2.5 in µg/m³, coloured by the US EPA's PM2.5 categories. Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

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SmogRank, most polluted cities in Daejeon, South Korea, PM2.5, last 30 days to 2 Oct 2026, 06:00 UTC, smogrank.com/kr/region/daejeon?w=30d.

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Updated 2026-10-02 06:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors in µg/m³.