SmogRank / World / South Korea / Chungcheongnam-do / 2026

Most polluted cities in Chungcheongnam-do, South Korea, 2026

14 cities in Chungcheongnam-do, South Korea ranked by their average PM2.5 so far (278 of 365 days); 14 above the WHO annual guideline (5.0 µg/m³). Worst: Seonghwan at 22.8 µg/m³, #303 of 2,745 cities in the world. Cleanest: Buyeo at 12.4. 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 15% 10%0
Every city in Chungcheongnam-do, South Korea ranked for 2026, 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

All cities in the world, 2026 · All cities in South Korea, 2026 · Chungcheongnam-do now

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

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