SmogRank / Episodes / South Korea
South Korea, April 2024
For 4 days, from 6 to 9 April 2024, 28 cities in South Korea had PM2.5 at least twice their usual for the time of year. The worst reading was Seonghwan, Chungcheongnam-do, South Korea: 55.3 µg/m³ on 6 April, about 2.0× its usual 27.2.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 28 in 1 country
Days 4 6 to 9 April 2024
Worst day 8 April 14 cities counted
Furthest above usual 2.4× Geoje
Day by day
Play 8 April 14 cities at twice their usual or more
Koesan Sangju Cheongju-si Chungju Yeongdong Gimcheon Chinch'ŏn Daejeon Yecheon Sejong Kinzan Gumi Kunwi Yeoju Cheonan Waegwan Wŏnju Yeongju Pubal Icheon-si Andong Neietsu Pyeongtaek Jinan-gun Asan Hwawŏn Changsu Daegu Yangp'yŏng Osan Wanju Yesan Gwangju Iksan Gyeongsan-si Suwon Hayang Seongnam-si Cheongsong gun Hanam Changnyeong Hongseong Hwado Hwaseong-si Kimje T’aebaek Namyangju Nangen Anyang-si Guri-si Tangjin Ansan-si Chuncheon Gunsan Gapyeong Seoul Gwangmyeong Jeongeup Miryang Chinju Kurye Buan Uijeongbu-si Bucheon-si Seosan Naesŏ Incheon Hadong Goyang-si Yanggu Yeonil Damyang Santyoku Changwon Donghae City Pohang Gimpo-si Kwangyang Jumunjin Gwangyang Koch'ang Goseong Kimhae Yangsan Jangseong Munsan Gwangju Hwasun Cheorwon Masan Tongyeong Beolgyo Ganghwa-gun Sinhyeon Busan Gijang Yeonggwang Naju Boseong Muan Jangheung Yeongam Mokpo Haenam Sinan Tsushima Nagato Mine Hagi Yamaguchi Masuda Hamada Gōtsuchō Ōdachō-ōda Ōtake Iwakuni Yae Izumo Hiroshima Unnan Kure Miyoshi Higashihiroshima Takehara Yŏnmu Gyeongju Mungyeong Okcheon Suncheon Ulsan Eisen Yangju Seonghwan Taesal-li Jeonju Namsa Nonsan Boryeong Ungsang Gangneung Sokcho Hongch’ŏn Anseong Imsil Yeosu Hwacheon Gongju Wabu Kosong Jungpyong Buyeo Geoje 3 Apr 4 5 6 7 8 9 10 11 12 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
Seonghwan Seonghwan, 3 April: no reading Seonghwan, 4 April: 20.9 µg/m³, 0.8× usual Seonghwan, 5 April: 22.8 µg/m³, 0.8× usual Seonghwan, 6 April: 55.3 µg/m³, 2.0× usual Seonghwan, 7 April: 40.5 µg/m³, 1.5× usual Seonghwan, 8 April: 35.0 µg/m³, 1.3× usual Seonghwan, 9 April: 31.6 µg/m³, 1.2× usual Seonghwan, 10 April: 19.8 µg/m³, 0.7× usual Seonghwan, 11 April: 29.8 µg/m³, 1.1× usual Seonghwan, 12 April: no reading Anseong Anseong, 3 April: no reading Anseong, 4 April: 9.5 µg/m³, 0.5× usual Anseong, 5 April: 17.4 µg/m³, 0.8× usual Anseong, 6 April: 44.0 µg/m³, 2.1× usual Anseong, 7 April: 39.9 µg/m³, 1.9× usual Anseong, 8 April: 34.3 µg/m³, 1.6× usual Anseong, 9 April: 20.9 µg/m³, 1.0× usual Anseong, 10 April: 14.0 µg/m³, 0.7× usual Anseong, 11 April: 21.3 µg/m³, 1.0× usual Anseong, 12 April: no reading Wabu Wabu, 3 April: 17.0 µg/m³, 0.9× usual Wabu, 4 April: 12.1 µg/m³, 0.6× usual Wabu, 5 April: 17.3 µg/m³, 0.9× usual Wabu, 6 April: 40.8 µg/m³, 2.2× usual Wabu, 7 April: 39.5 µg/m³, 2.1× usual Wabu, 8 April: 29.2 µg/m³, 1.6× usual Wabu, 9 April: 15.2 µg/m³, 0.8× usual Wabu, 10 April: 16.0 µg/m³, 0.9× usual Wabu, 11 April: 17.7 µg/m³, 0.9× usual Wabu, 12 April: no reading Taesal-li Taesal-li, 3 April: 17.8 µg/m³, 1.1× usual Taesal-li, 4 April: 28.5 µg/m³, 1.7× usual Taesal-li, 5 April: 21.2 µg/m³, 1.3× usual Taesal-li, 6 April: 33.2 µg/m³, 2.0× usual Taesal-li, 7 April: 24.4 µg/m³, 1.5× usual Taesal-li, 8 April: 17.7 µg/m³, 1.1× usual Taesal-li, 9 April: 22.7 µg/m³, 1.4× usual Taesal-li, 10 April: 13.7 µg/m³, 0.8× usual Taesal-li, 11 April: 15.0 µg/m³, 0.9× usual Taesal-li, 12 April: no reading Jungpyong Jungpyong, 3 April: 8.9 µg/m³, 0.5× usual Jungpyong, 4 April: 13.8 µg/m³, 0.7× usual Jungpyong, 5 April: 18.7 µg/m³, 1.0× usual Jungpyong, 6 April: 40.1 µg/m³, 2.0× usual Jungpyong, 7 April: 45.2 µg/m³, 2.3× usual Jungpyong, 8 April: 45.5 µg/m³, 2.3× usual Jungpyong, 9 April: 24.9 µg/m³, 1.3× usual Jungpyong, 10 April: 16.0 µg/m³, 0.8× usual Jungpyong, 11 April: 23.3 µg/m³, 1.2× usual Jungpyong, 12 April: no reading Gongju Gongju, 3 April: 7.3 µg/m³, 0.4× usual Gongju, 4 April: 10.4 µg/m³, 0.6× usual Gongju, 5 April: 16.6 µg/m³, 1.0× usual Gongju, 6 April: 26.0 µg/m³, 1.5× usual Gongju, 7 April: 37.8 µg/m³, 2.2× usual Gongju, 8 April: 30.0 µg/m³, 1.8× usual Gongju, 9 April: 29.5 µg/m³, 1.7× usual Gongju, 10 April: 26.6 µg/m³, 1.6× usual Gongju, 11 April: 19.2 µg/m³, 1.1× usual Gongju, 12 April: no reading Yangju Yangju, 3 April: 24.5 µg/m³, 1.4× usual Yangju, 4 April: 12.0 µg/m³, 0.7× usual Yangju, 5 April: 17.0 µg/m³, 1.0× usual Yangju, 6 April: 31.3 µg/m³, 1.8× usual Yangju, 7 April: 34.7 µg/m³, 2.0× usual Yangju, 8 April: 28.8 µg/m³, 1.7× usual Yangju, 9 April: 12.6 µg/m³, 0.7× usual Yangju, 10 April: 15.7 µg/m³, 0.9× usual Yangju, 11 April: 21.2 µg/m³, 1.2× usual Yangju, 12 April: no reading Hongch’ŏn Hongch’ŏn, 3 April: 17.5 µg/m³, 1.1× usual Hongch’ŏn, 4 April: 14.7 µg/m³, 0.9× usual Hongch’ŏn, 5 April: 17.1 µg/m³, 1.0× usual Hongch’ŏn, 6 April: 27.2 µg/m³, 1.7× usual Hongch’ŏn, 7 April: 34.3 µg/m³, 2.1× usual Hongch’ŏn, 8 April: 33.0 µg/m³, 2.0× usual Hongch’ŏn, 9 April: 12.1 µg/m³, 0.7× usual Hongch’ŏn, 10 April: 16.0 µg/m³, 1.0× usual Hongch’ŏn, 11 April: 25.7 µg/m³, 1.6× usual Hongch’ŏn, 12 April: no reading Hwacheon Hwacheon, 3 April: 15.1 µg/m³, 1.0× usual Hwacheon, 4 April: 13.9 µg/m³, 1.0× usual Hwacheon, 5 April: 15.5 µg/m³, 1.1× usual Hwacheon, 6 April: 24.3 µg/m³, 1.7× usual Hwacheon, 7 April: 31.1 µg/m³, 2.2× usual Hwacheon, 8 April: 28.3 µg/m³, 2.0× usual Hwacheon, 9 April: 10.1 µg/m³, 0.7× usual Hwacheon, 10 April: 13.8 µg/m³, 1.0× usual Hwacheon, 11 April: 16.7 µg/m³, 1.2× usual Hwacheon, 12 April: no reading Ulsan Ulsan, 3 April: 9.7 µg/m³, 0.5× usual Ulsan, 4 April: 17.0 µg/m³, 0.9× usual Ulsan, 5 April: 13.6 µg/m³, 0.7× usual Ulsan, 6 April: 24.2 µg/m³, 1.3× usual Ulsan, 7 April: 33.7 µg/m³, 1.7× usual Ulsan, 8 April: 38.8 µg/m³, 2.0× usual Ulsan, 9 April: 15.4 µg/m³, 0.8× usual Ulsan, 10 April: 8.5 µg/m³, 0.4× usual Ulsan, 11 April: 14.8 µg/m³, 0.8× usual Ulsan, 12 April: no reading Okcheon Okcheon, 3 April: no reading Okcheon, 4 April: 9.0 µg/m³, 0.5× usual Okcheon, 5 April: 14.6 µg/m³, 0.8× usual Okcheon, 6 April: no reading Okcheon, 7 April: 28.3 µg/m³, 1.6× usual Okcheon, 8 April: 36.1 µg/m³, 2.0× usual Okcheon, 9 April: no reading Okcheon, 10 April: 11.2 µg/m³, 0.6× usual Okcheon, 11 April: 21.3 µg/m³, 1.2× usual Okcheon, 12 April: no reading Geoje Geoje, 3 April: 8.1 µg/m³, 0.5× usual Geoje, 4 April: 13.9 µg/m³, 0.9× usual Geoje, 5 April: 18.5 µg/m³, 1.2× usual Geoje, 6 April: 24.5 µg/m³, 1.6× usual Geoje, 7 April: 20.9 µg/m³, 1.4× usual Geoje, 8 April: 36.0 µg/m³, 2.4× usual Geoje, 9 April: 14.7 µg/m³, 1.0× usual Geoje, 10 April: 11.9 µg/m³, 0.8× usual Geoje, 11 April: 20.8 µg/m³, 1.4× usual Geoje, 12 April: no reading Mungyeong Mungyeong, 3 April: 11.8 µg/m³, 0.7× usual Mungyeong, 4 April: 15.8 µg/m³, 0.9× usual Mungyeong, 5 April: 17.5 µg/m³, 1.0× usual Mungyeong, 6 April: 21.4 µg/m³, 1.2× usual Mungyeong, 7 April: 27.8 µg/m³, 1.6× usual Mungyeong, 8 April: 35.2 µg/m³, 2.0× usual Mungyeong, 9 April: 19.0 µg/m³, 1.1× usual Mungyeong, 10 April: 10.0 µg/m³, 0.6× usual Mungyeong, 11 April: 19.0 µg/m³, 1.1× usual Mungyeong, 12 April: no reading Sokcho Sokcho, 3 April: 24.2 µg/m³, 1.5× usual Sokcho, 4 April: 21.1 µg/m³, 1.3× usual Sokcho, 5 April: 19.9 µg/m³, 1.2× usual Sokcho, 6 April: 23.3 µg/m³, 1.4× usual Sokcho, 7 April: 26.2 µg/m³, 1.6× usual Sokcho, 8 April: 34.5 µg/m³, 2.1× usual Sokcho, 9 April: 13.7 µg/m³, 0.9× usual Sokcho, 10 April: 12.4 µg/m³, 0.8× usual Sokcho, 11 April: 26.5 µg/m³, 1.6× usual Sokcho, 12 April: no reading Ungsang Ungsang, 3 April: 12.2 µg/m³, 0.8× usual Ungsang, 4 April: 17.0 µg/m³, 1.1× usual Ungsang, 5 April: 16.4 µg/m³, 1.0× usual Ungsang, 6 April: 19.8 µg/m³, 1.2× usual Ungsang, 7 April: 24.0 µg/m³, 1.5× usual Ungsang, 8 April: 33.5 µg/m³, 2.1× usual Ungsang, 9 April: 16.1 µg/m³, 1.0× usual Ungsang, 10 April: 9.7 µg/m³, 0.6× usual Ungsang, 11 April: 13.5 µg/m³, 0.8× usual Ungsang, 12 April: no reading Gyeongju Gyeongju, 3 April: 13.2 µg/m³, 0.8× usual Gyeongju, 4 April: 19.9 µg/m³, 1.3× usual Gyeongju, 5 April: 16.4 µg/m³, 1.0× usual Gyeongju, 6 April: 20.1 µg/m³, 1.3× usual Gyeongju, 7 April: 23.3 µg/m³, 1.5× usual Gyeongju, 8 April: 32.1 µg/m³, 2.0× usual Gyeongju, 9 April: 17.7 µg/m³, 1.1× usual Gyeongju, 10 April: 9.3 µg/m³, 0.6× usual Gyeongju, 11 April: 15.3 µg/m³, 1.0× usual Gyeongju, 12 April: no reading Gangneung Gangneung, 3 April: 21.5 µg/m³, 1.4× usual Gangneung, 4 April: 21.3 µg/m³, 1.4× usual Gangneung, 5 April: 19.3 µg/m³, 1.3× usual Gangneung, 6 April: 19.5 µg/m³, 1.3× usual Gangneung, 7 April: 20.4 µg/m³, 1.4× usual Gangneung, 8 April: 31.6 µg/m³, 2.1× usual Gangneung, 9 April: 12.8 µg/m³, 0.9× usual Gangneung, 10 April: 14.6 µg/m³, 1.0× usual Gangneung, 11 April: 26.8 µg/m³, 1.8× usual Gangneung, 12 April: no reading Eisen Eisen, 3 April: no reading Eisen, 4 April: 16.1 µg/m³, 1.0× usual Eisen, 5 April: 18.0 µg/m³, 1.1× usual Eisen, 6 April: 26.9 µg/m³, 1.7× usual Eisen, 7 April: 26.7 µg/m³, 1.7× usual Eisen, 8 April: 31.5 µg/m³, 2.0× usual Eisen, 9 April: 17.8 µg/m³, 1.1× usual Eisen, 10 April: 12.9 µg/m³, 0.8× usual Eisen, 11 April: 18.8 µg/m³, 1.2× usual Eisen, 12 April: no reading Yeosu Yeosu, 3 April: 4.3 µg/m³, 0.3× usual Yeosu, 4 April: 13.1 µg/m³, 0.9× usual Yeosu, 5 April: 17.8 µg/m³, 1.3× usual Yeosu, 6 April: 25.5 µg/m³, 1.8× usual Yeosu, 7 April: 24.6 µg/m³, 1.8× usual Yeosu, 8 April: 30.3 µg/m³, 2.2× usual Yeosu, 9 April: 17.2 µg/m³, 1.2× usual Yeosu, 10 April: 9.9 µg/m³, 0.7× usual Yeosu, 11 April: 11.5 µg/m³, 0.8× usual Yeosu, 12 April: no reading Suncheon Suncheon, 3 April: 3.9 µg/m³, 0.3× usual Suncheon, 4 April: 16.6 µg/m³, 1.1× usual Suncheon, 5 April: 19.6 µg/m³, 1.3× usual Suncheon, 6 April: 21.3 µg/m³, 1.5× usual Suncheon, 7 April: 26.6 µg/m³, 1.8× usual Suncheon, 8 April: 29.8 µg/m³, 2.0× usual Suncheon, 9 April: 26.0 µg/m³, 1.8× usual Suncheon, 10 April: 12.5 µg/m³, 0.9× usual Suncheon, 11 April: 16.1 µg/m³, 1.1× usual Suncheon, 12 April: no reading Kosong Kosong, 3 April: 18.4 µg/m³, 1.7× usual Kosong, 4 April: 16.9 µg/m³, 1.6× usual Kosong, 5 April: 15.6 µg/m³, 1.4× usual Kosong, 6 April: 18.0 µg/m³, 1.7× usual Kosong, 7 April: 19.0 µg/m³, 1.8× usual Kosong, 8 April: 25.0 µg/m³, 2.3× usual Kosong, 9 April: 7.9 µg/m³, 0.7× usual Kosong, 10 April: 9.0 µg/m³, 0.8× usual Kosong, 11 April: 18.5 µg/m³, 1.7× usual Kosong, 12 April: no reading Yŏnmu Yŏnmu, 3 April: 7.9 µg/m³, 0.4× usual Yŏnmu, 4 April: 11.7 µg/m³, 0.6× usual Yŏnmu, 5 April: 15.7 µg/m³, 0.8× usual Yŏnmu, 6 April: 29.4 µg/m³, 1.4× usual Yŏnmu, 7 April: 30.3 µg/m³, 1.5× usual Yŏnmu, 8 April: 32.5 µg/m³, 1.6× usual Yŏnmu, 9 April: 41.6 µg/m³, 2.0× usual Yŏnmu, 10 April: 26.8 µg/m³, 1.3× usual Yŏnmu, 11 April: 21.0 µg/m³, 1.0× usual Yŏnmu, 12 April: no reading Nonsan Nonsan, 3 April: 7.0 µg/m³, 0.4× usual Nonsan, 4 April: 15.0 µg/m³, 0.8× usual Nonsan, 5 April: 19.1 µg/m³, 1.0× usual Nonsan, 6 April: 31.0 µg/m³, 1.6× usual Nonsan, 7 April: 33.0 µg/m³, 1.7× usual Nonsan, 8 April: 30.0 µg/m³, 1.6× usual Nonsan, 9 April: 40.9 µg/m³, 2.1× usual Nonsan, 10 April: 26.4 µg/m³, 1.4× usual Nonsan, 11 April: 23.3 µg/m³, 1.2× usual Nonsan, 12 April: no reading Namsa Namsa, 3 April: 9.0 µg/m³, 0.5× usual Namsa, 4 April: 16.0 µg/m³, 0.8× usual Namsa, 5 April: 18.8 µg/m³, 1.0× usual Namsa, 6 April: 30.9 µg/m³, 1.6× usual Namsa, 7 April: 29.8 µg/m³, 1.5× usual Namsa, 8 April: 29.8 µg/m³, 1.5× usual Namsa, 9 April: 40.7 µg/m³, 2.1× usual Namsa, 10 April: 25.0 µg/m³, 1.3× usual Namsa, 11 April: 20.6 µg/m³, 1.1× usual Namsa, 12 April: no reading Boryeong Boryeong, 3 April: 7.3 µg/m³, 0.4× usual Boryeong, 4 April: 19.6 µg/m³, 1.0× usual Boryeong, 5 April: 21.8 µg/m³, 1.2× usual Boryeong, 6 April: 32.1 µg/m³, 1.7× usual Boryeong, 7 April: 31.2 µg/m³, 1.7× usual Boryeong, 8 April: 20.9 µg/m³, 1.1× usual Boryeong, 9 April: 39.9 µg/m³, 2.1× usual Boryeong, 10 April: 19.5 µg/m³, 1.0× usual Boryeong, 11 April: 18.2 µg/m³, 1.0× usual Boryeong, 12 April: no reading Buyeo Buyeo, 3 April: 7.3 µg/m³, 0.5× usual Buyeo, 4 April: 9.3 µg/m³, 0.6× usual Buyeo, 5 April: 14.5 µg/m³, 0.9× usual Buyeo, 6 April: 23.7 µg/m³, 1.5× usual Buyeo, 7 April: 25.0 µg/m³, 1.6× usual Buyeo, 8 April: 21.6 µg/m³, 1.4× usual Buyeo, 9 April: 38.1 µg/m³, 2.4× usual Buyeo, 10 April: 29.5 µg/m³, 1.8× usual Buyeo, 11 April: 19.6 µg/m³, 1.2× usual Buyeo, 12 April: no reading Jeonju Jeonju, 3 April: 8.0 µg/m³, 0.5× usual Jeonju, 4 April: 15.1 µg/m³, 0.9× usual Jeonju, 5 April: 18.4 µg/m³, 1.1× usual Jeonju, 6 April: 25.2 µg/m³, 1.5× usual Jeonju, 7 April: 27.5 µg/m³, 1.6× usual Jeonju, 8 April: 28.5 µg/m³, 1.7× usual Jeonju, 9 April: 36.7 µg/m³, 2.1× usual Jeonju, 10 April: 24.1 µg/m³, 1.4× usual Jeonju, 11 April: 18.4 µg/m³, 1.1× usual Jeonju, 12 April: no reading Imsil Imsil, 3 April: 6.9 µg/m³, 0.5× usual Imsil, 4 April: 9.5 µg/m³, 0.6× usual Imsil, 5 April: 19.1 µg/m³, 1.2× usual Imsil, 6 April: 22.2 µg/m³, 1.5× usual Imsil, 7 April: 27.6 µg/m³, 1.8× usual Imsil, 8 April: 27.2 µg/m³, 1.8× usual Imsil, 9 April: 34.0 µg/m³, 2.2× usual Imsil, 10 April: 18.1 µg/m³, 1.2× usual Imsil, 11 April: 20.9 µg/m³, 1.4× usual Imsil, 12 April: no reading 3 Apr 4 5 6 7 8 9 10 11 12 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
Geoje Gyeongsangnam-do, South Korea 1 8 April 15.0 2.4× Buyeo Chungcheongnam-do, South Korea 1 9 April 16.0 2.4× Jungpyong North Chungcheong, South Korea 2 8 April 19.6 2.3× Kosong Gangwon-do, South Korea 1 8 April 10.8 2.3× Imsil Jeollabuk-do, South Korea 1 9 April 15.3 2.2× Gongju Chungcheongnam-do, South Korea 1 7 April 17.1 2.2× Wabu Gyeonggi-do, South Korea 2 6 April 18.8 2.2× Yeosu Jeollanam-do, South Korea 1 8 April 14.0 2.2× Hwacheon Gangwon-do, South Korea 1 7 April 14.4 2.2× Jeonju Jeollabuk-do, South Korea 1 9 April 17.1 2.1× Sokcho Gangwon-do, South Korea 1 8 April 16.1 2.1× Nonsan Chungcheongnam-do, South Korea 1 9 April 19.2 2.1× Gangneung Gangwon-do, South Korea 1 8 April 14.9 2.1× Boryeong Chungcheongnam-do, South Korea 1 9 April 18.9 2.1× Ungsang Gyeongsangnam-do, South Korea 1 8 April 16.0 2.1× Hongch’ŏn Gangwon-do, South Korea 2 7 April 16.4 2.1× Namsa Jeollabuk-do, South Korea 1 9 April 19.5 2.1× Anseong Gyeonggi-do, South Korea 1 6 April 21.1 2.1× Gyeongju Gyeongsangbuk-do, South Korea 1 8 April 15.7 2.0× Suncheon Jeollanam-do, South Korea 1 8 April 14.6 2.0× Taesal-li Chungcheongnam-do, South Korea 1 6 April 16.3 2.0× Seonghwan Chungcheongnam-do, South Korea 1 6 April 27.2 2.0× Yangju Gyeonggi-do, South Korea 1 7 April 17.1 2.0× Yŏnmu Chungcheongnam-do, South Korea 1 9 April 20.6 2.0× Mungyeong Gyeongsangbuk-do, South Korea 1 8 April 17.5 2.0× Ulsan Ulsan, South Korea 1 8 April 19.3 2.0× Eisen Gyeongsangbuk-do, South Korea 1 8 April 15.7 2.0× Okcheon North Chungcheong, South Korea 1 8 April 18.0 2.0×
Daily means in µg/m³. Usual: the city's median for this time of year (its days within 21 days of the date, every year, leaving out the week around it). Above usual: its highest day against that.
Against other episodes in South Korea
Number 36 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, February 2026 147 South Korea, February 2025 132 South Korea, November 2025 128 South Korea, February 2026 121 South Korea, December 2025 113 South Korea, January 2025 113 South Korea, December 2025 107 South Korea, April 2024 28 Bars: cities reached; colour: the level of the episode's highest daily reading. All 63 .
Use this page SmogRank, South Korea, April 2024: 28 cities with PM2.5 at twice their usual or more, 6 to 9 April 2024, smogrank.com/episodes/2024-04-south-korea (accessed 3 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.
