SmogRank / World / Asia / South Korea / Daejeon

Most polluted cities in Daejeon, South Korea

1 measured city, this year; 1 above the WHO annual guideline. Worst: Daejeon at 42.0 µg/m³, #164 in the world.

Chungcheongnam-do: 13 measured citiesDaejeon: 1 measured cityNorth Chungcheong: 7 measured cities#1 Daejeon: 42.0 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
  1. 1Daejeon 598.4×
Excellent0–50
Good51–100
Lightly polluted101–150
Moderately polluted151–200
Heavily polluted201–300
Severely polluted301+

China's Air Quality Index (HJ 633-2012), PM2.5 individual index. 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, this year to 2 Oct 2026, 04:00 UTC, smogrank.com/kr/region/daejeon?w=year.

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Updated 2026-10-02 04:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the China AQI PM2.5 sub-index.