SmogRank / World / South Korea / North Chungcheong / October 2026

Most polluted cities in North Chungcheong, South Korea, October 2026

7 cities in North Chungcheong, South Korea ranked by their average PM2.5 so far (5 of 31 days). Worst: Okcheon at 12.0 µg/m³, #321 of 2,246 cities in the world. Cleanest: Yeongdong at 7.1. 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.

← Okcheon 0% 0.75%0
Every city in North Chungcheong, South Korea ranked for October 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. 1Okcheon
    0%
  2. 2Koesan
    0%
  3. 3Chinch'ŏn
    0%
  4. 4Chungju
    0%
  5. 5Cheongju-si
    0%
  6. 6Jungpyong
    0%
  7. 7Yeongdong
    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, October 2026 · All cities in South Korea, October 2026 · North Chungcheong now

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SmogRank, most polluted cities in North Chungcheong, South Korea, PM2.5, October 2026 (so far), smogrank.com/kr/region/north-chungcheong/history/2026-10 (accessed 6 Oct 2026).

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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.