SmogRank / Episodes / South Korea
South Korea, 11 December 2024
For 1 day, on 11 December 2024, 21 cities in South Korea had PM2.5 at least twice their usual for the time of year. The worst reading was Anseong, Gyeonggi-do, South Korea: 41.8 µg/m³ on 11 December, about 2.3× its usual 18.0.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 21 in 1 country
Days 1 11 December 2024
Worst day 11 December 21 cities counted
Furthest above usual 2.3× Anseong
Day by day
Play 11 December 21 cities at twice their usual or more
Icheon-si Seonghwan Gwangju Suwon Pubal Chinch'ŏn Yeoju Yangp'yŏng Asan Jungpyong Namyangju Hwado Sejong Cheongju-si Yesan Tangjin Chungju Wŏnju Gapyeong Hongseong Daejeon Taesal-li Hongch’ŏn Munsan Chuncheon Seosan Okcheon Buyeo Nonsan Ganghwa-gun Yŏnmu Boryeong Cheorwon Hwacheon Kinzan Mungyeong Yeongdong Sangju Yanggu Neietsu Namsa Iksan Gunsan Yecheon Wanju Jeonju Gimcheon Jinan-gun Kimje Yeongju Gumi Buan Changsu Imsil Jeongeup Andong Kunwi Waegwan Sokcho Gangneung Kosong T’aebaek Nangen Jumunjin Koch'ang Hwawŏn Damyang Daegu Donghae City Jangseong Cheongsong gun Santyoku Kurye Gyeongsan-si Hayang Yeonggwang Gwangju Changnyeong Eisen Masan Hwasun Chinju Hadong Naju Kwangyang Suncheon Miryang Gwangyang Naesŏ Muan Beolgyo Gyeongju Yeonil Boseong Pohang Changwon Yeongam Yeosu Goseong Mokpo Kimhae Yangsan Tongyeong Sinan Ungsang Ulsan Sinhyeon Busan Gijang Geoje Gongju Cheonan Hanam Yangju Seongnam-si Bucheon-si Wabu Ansan-si Hwaseong-si Incheon Gimpo-si Guri-si Uijeongbu-si Gwangmyeong Seoul Osan Koesan Pyeongtaek Goyang-si Anyang-si Anseong 8 Dec 9 10 11 12 13 14 Every measured city in the area, coloured by its PM2.5 that day; a dark ring marks a city at twice its usual or more. Bars: cities counted each day, coloured by their median level. Choose a day or press play; without JavaScript, the days link to that day's world ranking.
How it spread
Anseong Anseong, 8 December: 9.2 µg/m³ Anseong, 9 December: 17.3 µg/m³ Anseong, 10 December: 29.4 µg/m³ Anseong, 11 December: 41.8 µg/m³, 2.3× its usual 18.0 Anseong, 12 December: 31.7 µg/m³ Anseong, 13 December: 15.3 µg/m³ Anseong, 14 December: 10.6 µg/m³ Pyeongtaek Pyeongtaek, 8 December: 10.0 µg/m³ Pyeongtaek, 9 December: 21.8 µg/m³ Pyeongtaek, 10 December: 32.5 µg/m³ Pyeongtaek, 11 December: 40.9 µg/m³, 2.1× its usual 19.1 Pyeongtaek, 12 December: 26.0 µg/m³ Pyeongtaek, 13 December: 17.2 µg/m³ Pyeongtaek, 14 December: 15.2 µg/m³ Koesan Koesan, 8 December: 13.2 µg/m³ Koesan, 9 December: 18.7 µg/m³ Koesan, 10 December: 27.7 µg/m³ Koesan, 11 December: 38.4 µg/m³, 2.1× its usual 18.7 Koesan, 12 December: 35.2 µg/m³ Koesan, 13 December: 20.4 µg/m³ Koesan, 14 December: 16.1 µg/m³ Osan Osan, 8 December: 12.0 µg/m³ Osan, 9 December: 19.2 µg/m³ Osan, 10 December: 28.8 µg/m³ Osan, 11 December: 38.0 µg/m³, 2.1× its usual 18.3 Osan, 12 December: 24.8 µg/m³ Osan, 13 December: 14.6 µg/m³ Osan, 14 December: 14.4 µg/m³ Seoul Seoul, 8 December: 11.5 µg/m³ Seoul, 9 December: 17.0 µg/m³ Seoul, 10 December: 25.6 µg/m³ Seoul, 11 December: 37.9 µg/m³, 2.1× its usual 17.8 Seoul, 12 December: 22.5 µg/m³ Seoul, 13 December: 15.6 µg/m³ Seoul, 14 December: 14.9 µg/m³ Gwangmyeong Gwangmyeong, 8 December: 12.3 µg/m³ Gwangmyeong, 9 December: 17.5 µg/m³ Gwangmyeong, 10 December: 27.0 µg/m³ Gwangmyeong, 11 December: 37.7 µg/m³, 2.1× its usual 17.9 Gwangmyeong, 12 December: 18.3 µg/m³ Gwangmyeong, 13 December: 13.9 µg/m³ Gwangmyeong, 14 December: 15.0 µg/m³ Anyang-si Anyang-si, 8 December: 11.9 µg/m³ Anyang-si, 9 December: 16.3 µg/m³ Anyang-si, 10 December: 23.7 µg/m³ Anyang-si, 11 December: 36.9 µg/m³, 2.3× its usual 16.1 Anyang-si, 12 December: 20.0 µg/m³ Anyang-si, 13 December: 11.7 µg/m³ Anyang-si, 14 December: 14.1 µg/m³ Yangju Yangju, 8 December: 8.8 µg/m³ Yangju, 9 December: 17.3 µg/m³ Yangju, 10 December: 24.8 µg/m³ Yangju, 11 December: 36.9 µg/m³, 2.0× its usual 18.3 Yangju, 12 December: 21.3 µg/m³ Yangju, 13 December: 16.7 µg/m³ Yangju, 14 December: 12.6 µg/m³ Uijeongbu-si Uijeongbu-si, 8 December: 10.1 µg/m³ Uijeongbu-si, 9 December: 15.8 µg/m³ Uijeongbu-si, 10 December: 27.7 µg/m³ Uijeongbu-si, 11 December: 36.8 µg/m³, 2.1× its usual 17.3 Uijeongbu-si, 12 December: 22.8 µg/m³ Uijeongbu-si, 13 December: 16.5 µg/m³ Uijeongbu-si, 14 December: 13.9 µg/m³ Guri-si Guri-si, 8 December: 11.6 µg/m³ Guri-si, 9 December: 17.6 µg/m³ Guri-si, 10 December: 25.8 µg/m³ Guri-si, 11 December: 36.8 µg/m³, 2.1× its usual 17.2 Guri-si, 12 December: 23.7 µg/m³ Guri-si, 13 December: 16.3 µg/m³ Guri-si, 14 December: 14.9 µg/m³ Goyang-si Goyang-si, 8 December: 11.5 µg/m³ Goyang-si, 9 December: 18.5 µg/m³ Goyang-si, 10 December: 31.7 µg/m³ Goyang-si, 11 December: 36.6 µg/m³, 2.2× its usual 17.0 Goyang-si, 12 December: 22.8 µg/m³ Goyang-si, 13 December: 16.1 µg/m³ Goyang-si, 14 December: 14.8 µg/m³ Gimpo-si Gimpo-si, 8 December: 12.4 µg/m³ Gimpo-si, 9 December: 19.7 µg/m³ Gimpo-si, 10 December: 31.0 µg/m³ Gimpo-si, 11 December: 36.6 µg/m³, 2.1× its usual 17.7 Gimpo-si, 12 December: 18.4 µg/m³ Gimpo-si, 13 December: 15.5 µg/m³ Gimpo-si, 14 December: 15.8 µg/m³ Hanam Hanam, 8 December: 13.1 µg/m³ Hanam, 9 December: 18.4 µg/m³ Hanam, 10 December: 25.4 µg/m³ Hanam, 11 December: 36.5 µg/m³, 2.0× its usual 18.1 Hanam, 12 December: 26.7 µg/m³ Hanam, 13 December: 18.1 µg/m³ Hanam, 14 December: 14.9 µg/m³ Incheon Incheon, 8 December: 11.5 µg/m³ Incheon, 9 December: 18.2 µg/m³ Incheon, 10 December: 25.7 µg/m³ Incheon, 11 December: 36.3 µg/m³, 2.1× its usual 17.2 Incheon, 12 December: 18.4 µg/m³ Incheon, 13 December: 13.6 µg/m³ Incheon, 14 December: 13.5 µg/m³ Hwaseong-si Hwaseong-si, 8 December: 10.1 µg/m³ Hwaseong-si, 9 December: 19.4 µg/m³ Hwaseong-si, 10 December: 28.5 µg/m³ Hwaseong-si, 11 December: 35.7 µg/m³, 2.1× its usual 17.0 Hwaseong-si, 12 December: 17.7 µg/m³ Hwaseong-si, 13 December: 13.2 µg/m³ Hwaseong-si, 14 December: 10.4 µg/m³ Cheonan Cheonan, 8 December: 10.7 µg/m³ Cheonan, 9 December: 16.5 µg/m³ Cheonan, 10 December: 27.0 µg/m³ Cheonan, 11 December: 35.3 µg/m³, 2.0× its usual 17.4 Cheonan, 12 December: 19.6 µg/m³ Cheonan, 13 December: 13.1 µg/m³ Cheonan, 14 December: 11.6 µg/m³ Ansan-si Ansan-si, 8 December: 9.6 µg/m³ Ansan-si, 9 December: 19.0 µg/m³ Ansan-si, 10 December: 25.9 µg/m³ Ansan-si, 11 December: 34.8 µg/m³, 2.1× its usual 16.9 Ansan-si, 12 December: 16.6 µg/m³ Ansan-si, 13 December: 12.3 µg/m³ Ansan-si, 14 December: 12.0 µg/m³ Wabu Wabu, 8 December: 9.8 µg/m³ Wabu, 9 December: 13.6 µg/m³ Wabu, 10 December: 21.3 µg/m³ Wabu, 11 December: 34.8 µg/m³, 2.1× its usual 16.3 Wabu, 12 December: 25.1 µg/m³ Wabu, 13 December: 15.3 µg/m³ Wabu, 14 December: 12.8 µg/m³ Bucheon-si Bucheon-si, 8 December: 11.3 µg/m³ Bucheon-si, 9 December: 16.9 µg/m³ Bucheon-si, 10 December: 27.0 µg/m³ Bucheon-si, 11 December: 33.9 µg/m³, 2.1× its usual 16.1 Bucheon-si, 12 December: 16.8 µg/m³ Bucheon-si, 13 December: 13.4 µg/m³ Bucheon-si, 14 December: 13.7 µg/m³ Seongnam-si Seongnam-si, 8 December: 10.0 µg/m³ Seongnam-si, 9 December: 14.1 µg/m³ Seongnam-si, 10 December: 22.9 µg/m³ Seongnam-si, 11 December: 33.7 µg/m³, 2.1× its usual 15.9 Seongnam-si, 12 December: 21.3 µg/m³ Seongnam-si, 13 December: 12.4 µg/m³ Seongnam-si, 14 December: 12.8 µg/m³ Gongju Gongju, 8 December: 10.0 µg/m³ Gongju, 9 December: 13.9 µg/m³ Gongju, 10 December: 16.7 µg/m³ Gongju, 11 December: 31.3 µg/m³, 2.0× its usual 15.3 Gongju, 12 December: 17.9 µg/m³ Gongju, 13 December: 13.3 µg/m³ Gongju, 14 December: 10.5 µg/m³ 8 Dec 9 10 11 12 13 14 Every counted city, in the order the episode reached them, 3 days before to 3 after. Each square is a day, coloured by that day's PM2.5; outlined: at twice the city's usual or more. Good 0–50
Moderate 51–100
Sensitive groups 101–150
Unhealthy 151–200
Very unhealthy 201–300
Hazardous 301+
Every city it reached
City Days Highest Usual Above usual
Anseong Gyeonggi-do, South Korea 1 11 December 18.0 2.3× Anyang-si Gyeonggi-do, South Korea 1 11 December 16.1 2.3× Goyang-si Gyeonggi-do, South Korea 1 11 December 17.0 2.2× Pyeongtaek Gyeonggi-do, South Korea 1 11 December 19.1 2.1× Koesan North Chungcheong, South Korea 1 11 December 18.7 2.1× Osan Gyeonggi-do, South Korea 1 11 December 18.3 2.1× Seoul Seoul, South Korea 1 11 December 17.8 2.1× Gwangmyeong Gyeonggi-do, South Korea 1 11 December 17.9 2.1× Uijeongbu-si Gyeonggi-do, South Korea 1 11 December 17.3 2.1× Guri-si Gyeonggi-do, South Korea 1 11 December 17.2 2.1× Gimpo-si Gyeonggi-do, South Korea 1 11 December 17.7 2.1× Incheon Incheon, South Korea 1 11 December 17.2 2.1× Hwaseong-si Gyeonggi-do, South Korea 1 11 December 17.0 2.1× Ansan-si Gyeonggi-do, South Korea 1 11 December 16.9 2.1× Wabu Gyeonggi-do, South Korea 1 11 December 16.3 2.1× Bucheon-si Gyeonggi-do, South Korea 1 11 December 16.1 2.1× Seongnam-si Gyeonggi-do, South Korea 1 11 December 15.9 2.1× Yangju Gyeonggi-do, South Korea 1 11 December 18.3 2.0× Hanam Gyeonggi-do, South Korea 1 11 December 18.1 2.0× Cheonan Chungcheongnam-do, South Korea 1 11 December 17.4 2.0× Gongju Chungcheongnam-do, South Korea 1 11 December 15.3 2.0×
Daily means in µg/m³, over the days each city counted in this episode. Highest: its highest of those days. Usual: the city's median for the time of year of that day (its days within 21 days of the date, every year, leaving out the week around it). Above usual: its highest day against that, with a usual under 5 µg/m³ taken as 5.
Against other episodes in South Korea
Number 46 of 63 episodes in South Korea since our records began, by cities reached.
Japan and South Korea, March 2025 454 Japan and South Korea, March 2026 305 Japan and South Korea, January 2025 274 Japan and South Korea, February and March 2025 192 South Korea and Japan, January 2026 169 South Korea and Japan, 10 to 15 February 2026 147 South Korea, 14 to 16 February 2025 132 South Korea and Japan, November 2025 128 South Korea, February 2026 121 South Korea, 7 December 2025 113 South Korea, 13 to 14 January 2025 113 South Korea, 16 to 20 December 2025 107 South Korea, 11 December 2024 21 Bars: cities reached; colour: the level of the episode's highest daily reading. All 63 .
Use this page SmogRank, South Korea, 11 December 2024: 21 cities with PM2.5 at twice their usual or more, 11 December 2024, smogrank.com/episodes/2024-12-11-south-korea (accessed 4 October 2026).
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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms .
An episode is a run of days when many cities close to each other (four or more within 350 km on a day, 8 or more in all) each had a daily PM2.5 mean of at least 25 µg/m³ and at least 2 times their usual for that time of year. Found in our own measurements, not picked by hand. How we find episodes . Values are each city's daily mean of its own monitors; causes are the usual kinds for a pattern like this, not a confirmed source.
