SmogRank / World / Asia / South Korea / North Chungcheong

Most polluted cities in North Chungcheong, South Korea

7 measured cities, last 30 days; 0 above the WHO 24-hour guideline. Worst: Okcheon at 13.0 µg/m³, #434 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.

Seoul: 2 measured citiesGyeonggi-do: 25 measured citiesGyeongsangbuk-do: 17 measured citiesDaegu: 2 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#7 Yeongdong: 8.8 µg/m³#6 Jungpyong: 9.4 µg/m³#5 Chungju: 10.2 µg/m³#4 Cheongju-si: 11.0 µg/m³#3 Chinch'ŏn: 11.3 µg/m³#2 Koesan: 12.1 µg/m³#1 Okcheon: 13.0 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Okcheon 0% 0.75%0
Every measured city in North Chungcheong, 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. 1Okcheon 0%
  2. 2Koesan 0%
  3. 3Chinch'ŏn 0%
  4. 4Cheongju-si 0%
  5. 5Chungju 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

Bad-air episodes in North Chungcheong

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 North Chungcheong, South Korea, PM2.5, last 30 days to 6 Oct 2026, 23:00 UTC, smogrank.com/kr/region/north-chungcheong?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.