SmogRank / World / South Korea / North Chungcheong / February 2025
Most polluted cities in North Chungcheong, South Korea, February 2025
7 cities in North Chungcheong, South Korea ranked by their average PM2.5 over the 28 days. Worst: Koesan at 22.0 µg/m³, #413 of 2,574 cities in the world. Cleanest: Okcheon at 18.0. A city needs measurements on 70% of the days to be ranked.
About 157K people in these 5 cities breathed unhealthy air on an average day of February 2025.
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.
- 1Cheongju-si 122K
- 2Chungju 22.4K
- 3Koesan 4.76K
- 4Chinch'ŏn 4.36K
- 5Jungpyong 3.99K
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, February 2025 · All cities in South Korea, February 2025 · North Chungcheong now
Use this board
SmogRank, most polluted cities in North Chungcheong, South Korea, PM2.5, February 2025, smogrank.com/kr/region/north-chungcheong/history/2025-02 (accessed 7 Oct 2026).
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.