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

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

7 cities in North Chungcheong, South Korea ranked by their average PM2.5 over the 31 days. Worst: Okcheon at 24.5 µg/m³, #265 of 2,593 cities in the world. Cleanest: Jungpyong at 21.1. A city needs measurements on 70% of the days to be ranked.

About 155K people in these 5 cities breathed unhealthy air on an average day of January 2026.

Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.

← Cheongju-si 110K 100K0
Every city in North Chungcheong, South Korea ranked for January 2026 with monitors in two or more places, one column each, ranked by people breathing unhealthy air: height is people on an average day, colour its average. Point at it to read a city; tap to open it.
  1. 1Cheongju-si
    110K
  2. 2Chungju
    27K
  3. 3Chinch'ŏn
    7.87K
  4. 4Koesan
    5.74K
  5. 5Jungpyong
    4.8K
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 2026 · All cities in South Korea, January 2026 · North Chungcheong now

Use this board

SmogRank, most polluted cities in North Chungcheong, South Korea, PM2.5, January 2026, smogrank.com/kr/region/north-chungcheong/history/2026-01 (accessed 6 Oct 2026).

Download top 10 (PNG)

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.