SmogRank / World / Asia / South Korea / Chungcheongnam-do

Most polluted cities in Chungcheongnam-do, South Korea

14 measured cities, this year; 14 above the WHO annual guideline. Worst: Seosan at 130.2 µg/m³, #7 in the world.

Gyeonggi-do: 26 measured citiesGyeongsangbuk-do: 16 measured citiesChungcheongnam-do: 14 measured citiesDaejeon: 1 measured cityGyeongsangnam-do: 13 measured citiesGangwon-do: 14 measured citiesJeollabuk-do: 13 measured citiesNorth Chungcheong: 7 measured cities#14 Cheonan: 41.1 µg/m³#13 Yesan: 52.3 µg/m³#12 Asan: 55.0 µg/m³#11 Yŏnmu: 55.4 µg/m³#10 Buyeo: 66.7 µg/m³#9 Seonghwan: 82.8 µg/m³#8 Nonsan: 83.8 µg/m³#7 Gongju: 84.1 µg/m³#6 Boryeong: 84.2 µg/m³#5 Taesal-li: 98.6 µg/m³#4 Tangjin: 105.0 µg/m³#3 Kinzan: 106.7 µg/m³#2 Hongseong: 123.4 µg/m³#1 Seosan: 130.2 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Seosan 130.2 µg/m³ 100 µg/m³5 WHO annual guideline
Every measured city in Chungcheongnam-do, South Korea, one column each, worst on the left and cleanest on the right; height is PM2.5 in µg/m³. Point at it to read a city; tap to open it.
  1. 1Seosan 20626.0×
  2. 2Hongseong 19924.7×
  3. 3Kinzan 18721.3×
  4. 4Tangjin 18621.0×
  5. 5Taesal-li 18119.7×
  6. 6Boryeong 17116.8×
  7. 7Gongju 17116.8×
  8. 8Nonsan 17116.8×
  9. 9Seonghwan 17016.6×
  10. 10Buyeo 15913.3×
  11. 11Yŏnmu 15011.1×
  12. 12Asan 14911.0×
  13. 13Yesan 14210.5×
  14. 14Cheonan 1158.2×
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

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SmogRank, most polluted cities in Chungcheongnam-do, South Korea, PM2.5, this year to 2 Oct 2026, 08:00 UTC, smogrank.com/kr/region/chungcheongnam-do?w=year.

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Updated 2026-10-02 08:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.