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

Most polluted cities in Chungcheongnam-do, South Korea

13 measured cities, last 30 days; 13 above the WHO 24-hour guideline. Worst: Seosan at 224.6 µg/m³, #4 in the world.

Gyeonggi-do: 25 measured citiesGyeongsangbuk-do: 16 measured citiesChungcheongnam-do: 13 measured citiesDaejeon: 1 measured cityGyeongsangnam-do: 13 measured citiesGangwon-do: 14 measured citiesJeollabuk-do: 13 measured citiesNorth Chungcheong: 7 measured cities#13 Cheonan: 38.8 µg/m³#12 Gongju: 78.1 µg/m³#11 Asan: 80.2 µg/m³#10 Seonghwan: 84.6 µg/m³#9 Hongseong: 89.3 µg/m³#8 Boryeong: 94.9 µg/m³#7 Tangjin: 101.0 µg/m³#6 Buyeo: 106.3 µg/m³#5 Yŏnmu: 108.8 µg/m³#4 Yesan: 111.3 µg/m³#3 Nonsan: 135.7 µg/m³#2 Taesal-li: 176.6 µg/m³#1 Seosan: 224.6 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Seosan 224.6 µg/m³ 200 µg/m³15 WHO 24-hour 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 299
  2. 2Taesal-li 252
  3. 3Nonsan 211
  4. 4Yesan 190
  5. 5Yŏnmu 188
  6. 6Buyeo 187
  7. 7Tangjin 183
  8. 8Boryeong 179
  9. 9Hongseong 175
  10. 10Seonghwan 171
  11. 11Asan 168
  12. 12Gongju 167
  13. 13Cheonan 109
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, last 30 days to 2 Oct 2026, 08:00 UTC, smogrank.com/kr/region/chungcheongnam-do?w=30d.

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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.