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: Seonghwan at 22.7 µg/m³, #305 in the world.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

Gyeonggi-do: 26 measured citiesGyeongsangbuk-do: 17 measured citiesChungcheongnam-do: 14 measured citiesDaejeon: 2 measured citiesGyeongsangnam-do: 12 measured citiesGangwon-do: 15 measured citiesJeollabuk-do: 13 measured citiesNorth Chungcheong: 7 measured cities#14 Buyeo: 12.4 µg/m³#13 Gongju: 14.2 µg/m³#12 Seosan: 14.8 µg/m³#11 Taesal-li: 15.3 µg/m³#10 Nonsan: 15.5 µg/m³#9 Boryeong: 16.8 µg/m³#8 Yŏnmu: 17.3 µg/m³#7 Cheonan: 17.5 µg/m³#6 Kinzan: 17.7 µg/m³#5 Hongseong: 18.7 µg/m³#4 Asan: 19.3 µg/m³#3 Yesan: 19.4 µg/m³#2 Tangjin: 19.6 µg/m³#1 Seonghwan: 22.7 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Seonghwan 15% 10%0
Every measured city in Chungcheongnam-do, South Korea, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1Seonghwan 15%
  2. 2Asan 13%
  3. 3Yesan 11%
  4. 4Tangjin 11%
  5. 5Hongseong 10%
  6. 6Kinzan 10%
  7. 7Yŏnmu 9%
  8. 8Cheonan 9%
  9. 9Boryeong 7%
  10. 10Nonsan 7%
  11. 11Gongju 6%
  12. 12Taesal-li 5%
  13. 13Seosan 4%
  14. 14Buyeo 0%
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 Chungcheongnam-do

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 Chungcheongnam-do, South Korea, PM2.5, this year to 6 Oct 2026, 23:00 UTC, smogrank.com/kr/region/chungcheongnam-do?w=year.

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.

Updated 2026-10-06 23:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.