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

Most polluted cities in Chungcheongnam-do, South Korea

14 measured cities, last 30 days; 1 above the WHO 24-hour guideline. Worst: Seonghwan at 15.7 µg/m³, #336 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: 25 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 Kinzan: 8.0 µg/m³#13 Gongju: 8.9 µg/m³#12 Buyeo: 9.5 µg/m³#11 Taesal-li: 10.1 µg/m³#10 Seosan: 10.4 µg/m³#9 Asan: 11.0 µg/m³#8 Cheonan: 11.1 µg/m³#7 Nonsan: 11.2 µg/m³#6 Boryeong: 11.5 µg/m³#5 Yŏnmu: 12.3 µg/m³#4 Hongseong: 13.3 µg/m³#3 Tangjin: 13.6 µg/m³#2 Yesan: 13.8 µg/m³#1 Seonghwan: 15.7 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Seonghwan 0% 0.75%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 0%
  2. 2Yesan 0%
  3. 3Tangjin 0%
  4. 4Hongseong 0%
  5. 5Yŏnmu 0%
  6. 6Boryeong 0%
  7. 7Nonsan 0%
  8. 8Cheonan 0%
  9. 9Asan 0%
  10. 10Seosan 0%
  11. 11Taesal-li 0%
  12. 12Buyeo 0%
  13. 13Gongju 0%
  14. 14Kinzan 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, last 30 days to 6 Oct 2026, 23:00 UTC, smogrank.com/kr/region/chungcheongnam-do?w=30d.

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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.