SmogRank / World / Asia / South Korea / North Chungcheong

Most polluted cities in North Chungcheong, South Korea

7 measured cities, last 30 days; 7 above the WHO 24-hour guideline. Worst: Cheongju-si at 97.1 µg/m³, #35 in the world.

Seoul: 1 measured cityGyeonggi-do: 25 measured citiesGyeongsangbuk-do: 16 measured citiesDaegu: 2 measured citiesChungcheongnam-do: 13 measured citiesDaejeon: 1 measured cityGyeongsangnam-do: 13 measured citiesGangwon-do: 14 measured citiesJeollabuk-do: 13 measured citiesNorth Chungcheong: 7 measured cities#7 Chungju: 24.3 µg/m³#6 Chinch'ŏn: 25.9 µg/m³#5 Okcheon: 69.5 µg/m³#4 Yeongdong: 94.9 µg/m³#3 Koesan: 95.1 µg/m³#2 Jungpyong: 95.3 µg/m³#1 Cheongju-si: 97.1 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Cheongju-si 97.1 µg/m³ 90 µg/m³15 WHO 24-hour guideline
Every measured city in North Chungcheong, South Korea, one column each, worst on the left and cleanest on the right; height is PM2.5 in µg/m³. Point at it to read a city; tap to open it.
  1. 1Cheongju-si 180
  2. 2Jungpyong 179
  3. 3Koesan 179
  4. 4Yeongdong 179
  5. 5Okcheon 161
  6. 6Chinch'ŏn 82
  7. 7Chungju 79
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

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SmogRank, most polluted cities in North Chungcheong, South Korea, PM2.5, last 30 days to 2 Oct 2026, 08:00 UTC, smogrank.com/kr/region/north-chungcheong?w=30d.

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Updated 2026-10-02 08:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.