SmogRank / World / South Korea / Chungcheongnam-do / January 2025

Most polluted cities in Chungcheongnam-do, South Korea, January 2025

14 cities in Chungcheongnam-do, South Korea ranked by their average PM2.5 over the 31 days. Worst: Seonghwan at 32.6 µg/m³, #76 of 2,426 cities in the world. Cleanest: Taesal-li at 12.9. A city needs measurements on 70% of the days to be ranked.

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.

← Seonghwan 45% 40%0
Every city in Chungcheongnam-do, South Korea ranked for January 2025, 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
    45%
  2. 2Kinzan
    32%
  3. 3Asan
    29%
  4. 4Yŏnmu
    26%
  5. 5Hongseong
    23%
  6. 6Yesan
    19%
  7. 7Cheonan
    19%
  8. 8Buyeo
    16%
  9. 9Nonsan
    16%
  10. 10Tangjin
    13%
  11. 11Seosan
    13%
  12. 12Boryeong
    10%
  13. 13Gongju
    10%
  14. 14Taesal-li
    6%
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

All cities in the world, January 2025 · All cities in South Korea, January 2025 · Chungcheongnam-do now

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SmogRank, most polluted cities in Chungcheongnam-do, South Korea, PM2.5, January 2025, smogrank.com/kr/region/chungcheongnam-do/history/2025-01 (accessed 6 Oct 2026).

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