SmogRank / World / Asia / South Korea / Daejeon

Most polluted cities in Daejeon, South Korea

1 measured city, last 7 days; 0 above the WHO 24-hour guideline. Worst: Daejeon at 9.1 µg/m³, #937 in the world.

Chungcheongnam-do: 14 measured citiesDaejeon: 1 measured cityNorth Chungcheong: 7 measured cities#1 Daejeon: 9.1 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
  1. 1Daejeon 51
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

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 Daejeon

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 Daejeon, South Korea, PM2.5, last 7 days to 2 Oct 2026, 16:00 UTC, smogrank.com/kr/region/daejeon?w=7d.

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Updated 2026-10-02 16:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.