SmogRank / Episodes / South Korea
South Korea, 6 to 9 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× Buyeo
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 Suncheon Eisen Gyeongju Taesal-li Yangju Mungyeong Okcheon Ulsan Yŏnmu Seonghwan Gangneung Ungsang Hongch’ŏn Sokcho Jeonju Boryeong Namsa Nonsan Anseong Yeosu Hwacheon Imsil Gongju Wabu Kosong Jungpyong Geoje Buyeo 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 Seonghwan, 5 April: 22.8 µg/m³ Seonghwan, 6 April: 55.3 µg/m³, 2.0× its usual 27.2 Seonghwan, 7 April: 40.5 µg/m³ Seonghwan, 8 April: 35.0 µg/m³ Seonghwan, 9 April: 31.6 µg/m³ Seonghwan, 10 April: 19.8 µg/m³ Seonghwan, 11 April: 29.8 µg/m³ Seonghwan, 12 April: no reading Anseong Anseong, 3 April: no reading Anseong, 4 April: 9.5 µg/m³ Anseong, 5 April: 17.4 µg/m³ Anseong, 6 April: 44.0 µg/m³, 2.1× its usual 21.1 Anseong, 7 April: 39.9 µg/m³ Anseong, 8 April: 34.3 µg/m³ Anseong, 9 April: 20.9 µg/m³ Anseong, 10 April: 14.0 µg/m³ Anseong, 11 April: 21.3 µg/m³ Anseong, 12 April: no reading Wabu Wabu, 3 April: 17.0 µg/m³ Wabu, 4 April: 12.1 µg/m³ Wabu, 5 April: 17.3 µg/m³ Wabu, 6 April: 40.8 µg/m³, 2.2× its usual 18.8 Wabu, 7 April: 39.5 µg/m³, 2.2× its usual 18.1 Wabu, 8 April: 29.2 µg/m³ Wabu, 9 April: 15.2 µg/m³ Wabu, 10 April: 16.0 µg/m³ Wabu, 11 April: 17.7 µg/m³ Wabu, 12 April: no reading Taesal-li Taesal-li, 3 April: 17.8 µg/m³ Taesal-li, 4 April: 28.5 µg/m³ Taesal-li, 5 April: 21.2 µg/m³ Taesal-li, 6 April: 33.2 µg/m³, 2.0× its usual 16.3 Taesal-li, 7 April: 24.4 µg/m³ Taesal-li, 8 April: 17.7 µg/m³ Taesal-li, 9 April: 22.7 µg/m³ Taesal-li, 10 April: 13.7 µg/m³ Taesal-li, 11 April: 15.0 µg/m³ Taesal-li, 12 April: no reading Jungpyong Jungpyong, 3 April: 8.9 µg/m³ Jungpyong, 4 April: 13.8 µg/m³ Jungpyong, 5 April: 18.7 µg/m³ Jungpyong, 6 April: 40.1 µg/m³ Jungpyong, 7 April: 45.2 µg/m³, 2.3× its usual 19.9 Jungpyong, 8 April: 45.5 µg/m³, 2.3× its usual 19.6 Jungpyong, 9 April: 24.9 µg/m³ Jungpyong, 10 April: 16.0 µg/m³ Jungpyong, 11 April: 23.3 µg/m³ Jungpyong, 12 April: no reading Gongju Gongju, 3 April: 7.3 µg/m³ Gongju, 4 April: 10.4 µg/m³ Gongju, 5 April: 16.6 µg/m³ Gongju, 6 April: 26.0 µg/m³ Gongju, 7 April: 37.8 µg/m³, 2.2× its usual 17.1 Gongju, 8 April: 30.0 µg/m³ Gongju, 9 April: 29.5 µg/m³ Gongju, 10 April: 26.6 µg/m³ Gongju, 11 April: 19.2 µg/m³ Gongju, 12 April: no reading Yangju Yangju, 3 April: 24.5 µg/m³ Yangju, 4 April: 12.0 µg/m³ Yangju, 5 April: 17.0 µg/m³ Yangju, 6 April: 31.3 µg/m³ Yangju, 7 April: 34.7 µg/m³, 2.0× its usual 17.1 Yangju, 8 April: 28.8 µg/m³ Yangju, 9 April: 12.6 µg/m³ Yangju, 10 April: 15.7 µg/m³ Yangju, 11 April: 21.2 µg/m³ Yangju, 12 April: no reading Hongch’ŏn Hongch’ŏn, 3 April: 17.5 µg/m³ Hongch’ŏn, 4 April: 14.7 µg/m³ Hongch’ŏn, 5 April: 17.1 µg/m³ Hongch’ŏn, 6 April: 27.2 µg/m³ Hongch’ŏn, 7 April: 34.3 µg/m³, 2.1× its usual 16.4 Hongch’ŏn, 8 April: 33.0 µg/m³, 2.0× its usual 16.3 Hongch’ŏn, 9 April: 12.1 µg/m³ Hongch’ŏn, 10 April: 16.0 µg/m³ Hongch’ŏn, 11 April: 25.7 µg/m³ Hongch’ŏn, 12 April: no reading Hwacheon Hwacheon, 3 April: 15.1 µg/m³ Hwacheon, 4 April: 13.9 µg/m³ Hwacheon, 5 April: 15.5 µg/m³ Hwacheon, 6 April: 24.3 µg/m³ Hwacheon, 7 April: 31.1 µg/m³, 2.2× its usual 14.4 Hwacheon, 8 April: 28.3 µg/m³ Hwacheon, 9 April: 10.1 µg/m³ Hwacheon, 10 April: 13.8 µg/m³ Hwacheon, 11 April: 16.7 µg/m³ Hwacheon, 12 April: no reading Ulsan Ulsan, 3 April: 9.7 µg/m³ Ulsan, 4 April: 17.0 µg/m³ Ulsan, 5 April: 13.6 µg/m³ Ulsan, 6 April: 24.2 µg/m³ Ulsan, 7 April: 33.7 µg/m³ Ulsan, 8 April: 38.8 µg/m³, 2.0× its usual 19.3 Ulsan, 9 April: 15.4 µg/m³ Ulsan, 10 April: 8.5 µg/m³ Ulsan, 11 April: 14.8 µg/m³ Ulsan, 12 April: no reading Okcheon Okcheon, 3 April: no reading Okcheon, 4 April: 9.0 µg/m³ Okcheon, 5 April: 14.6 µg/m³ Okcheon, 6 April: no reading Okcheon, 7 April: 28.3 µg/m³ Okcheon, 8 April: 36.1 µg/m³, 2.0× its usual 18.0 Okcheon, 9 April: no reading Okcheon, 10 April: 11.2 µg/m³ Okcheon, 11 April: 21.3 µg/m³ Okcheon, 12 April: no reading Geoje Geoje, 3 April: 8.1 µg/m³ Geoje, 4 April: 13.9 µg/m³ Geoje, 5 April: 18.5 µg/m³ Geoje, 6 April: 24.5 µg/m³ Geoje, 7 April: 20.9 µg/m³ Geoje, 8 April: 36.0 µg/m³, 2.4× its usual 15.0 Geoje, 9 April: 14.7 µg/m³ Geoje, 10 April: 11.9 µg/m³ Geoje, 11 April: 20.8 µg/m³ Geoje, 12 April: no reading Mungyeong Mungyeong, 3 April: 11.8 µg/m³ Mungyeong, 4 April: 15.8 µg/m³ Mungyeong, 5 April: 17.5 µg/m³ Mungyeong, 6 April: 21.4 µg/m³ Mungyeong, 7 April: 27.8 µg/m³ Mungyeong, 8 April: 35.2 µg/m³, 2.0× its usual 17.5 Mungyeong, 9 April: 19.0 µg/m³ Mungyeong, 10 April: 10.0 µg/m³ Mungyeong, 11 April: 19.0 µg/m³ Mungyeong, 12 April: no reading Sokcho Sokcho, 3 April: 24.2 µg/m³ Sokcho, 4 April: 21.1 µg/m³ Sokcho, 5 April: 19.9 µg/m³ Sokcho, 6 April: 23.3 µg/m³ Sokcho, 7 April: 26.2 µg/m³ Sokcho, 8 April: 34.5 µg/m³, 2.1× its usual 16.1 Sokcho, 9 April: 13.7 µg/m³ Sokcho, 10 April: 12.4 µg/m³ Sokcho, 11 April: 26.5 µg/m³ Sokcho, 12 April: no reading Ungsang Ungsang, 3 April: 12.2 µg/m³ Ungsang, 4 April: 17.0 µg/m³ Ungsang, 5 April: 16.4 µg/m³ Ungsang, 6 April: 19.8 µg/m³ Ungsang, 7 April: 24.0 µg/m³ Ungsang, 8 April: 33.5 µg/m³, 2.1× its usual 16.0 Ungsang, 9 April: 16.1 µg/m³ Ungsang, 10 April: 9.7 µg/m³ Ungsang, 11 April: 13.5 µg/m³ Ungsang, 12 April: no reading Gyeongju Gyeongju, 3 April: 13.2 µg/m³ Gyeongju, 4 April: 19.9 µg/m³ Gyeongju, 5 April: 16.4 µg/m³ Gyeongju, 6 April: 20.1 µg/m³ Gyeongju, 7 April: 23.3 µg/m³ Gyeongju, 8 April: 32.1 µg/m³, 2.0× its usual 15.7 Gyeongju, 9 April: 17.7 µg/m³ Gyeongju, 10 April: 9.3 µg/m³ Gyeongju, 11 April: 15.3 µg/m³ Gyeongju, 12 April: no reading Gangneung Gangneung, 3 April: 21.5 µg/m³ Gangneung, 4 April: 21.3 µg/m³ Gangneung, 5 April: 19.3 µg/m³ Gangneung, 6 April: 19.5 µg/m³ Gangneung, 7 April: 20.4 µg/m³ Gangneung, 8 April: 31.6 µg/m³, 2.1× its usual 14.9 Gangneung, 9 April: 12.8 µg/m³ Gangneung, 10 April: 14.6 µg/m³ Gangneung, 11 April: 26.8 µg/m³ Gangneung, 12 April: no reading Eisen Eisen, 3 April: no reading Eisen, 4 April: 16.1 µg/m³ Eisen, 5 April: 18.0 µg/m³ Eisen, 6 April: 26.9 µg/m³ Eisen, 7 April: 26.7 µg/m³ Eisen, 8 April: 31.5 µg/m³, 2.0× its usual 15.7 Eisen, 9 April: 17.8 µg/m³ Eisen, 10 April: 12.9 µg/m³ Eisen, 11 April: 18.8 µg/m³ Eisen, 12 April: no reading Yeosu Yeosu, 3 April: 4.3 µg/m³ Yeosu, 4 April: 13.1 µg/m³ Yeosu, 5 April: 17.8 µg/m³ Yeosu, 6 April: 25.5 µg/m³ Yeosu, 7 April: 24.6 µg/m³ Yeosu, 8 April: 30.3 µg/m³, 2.2× its usual 14.0 Yeosu, 9 April: 17.2 µg/m³ Yeosu, 10 April: 9.9 µg/m³ Yeosu, 11 April: 11.5 µg/m³ Yeosu, 12 April: no reading Suncheon Suncheon, 3 April: 3.9 µg/m³ Suncheon, 4 April: 16.6 µg/m³ Suncheon, 5 April: 19.6 µg/m³ Suncheon, 6 April: 21.3 µg/m³ Suncheon, 7 April: 26.6 µg/m³ Suncheon, 8 April: 29.8 µg/m³, 2.0× its usual 14.6 Suncheon, 9 April: 26.0 µg/m³ Suncheon, 10 April: 12.5 µg/m³ Suncheon, 11 April: 16.1 µg/m³ Suncheon, 12 April: no reading Kosong Kosong, 3 April: 18.4 µg/m³ Kosong, 4 April: 16.9 µg/m³ Kosong, 5 April: 15.6 µg/m³ Kosong, 6 April: 18.0 µg/m³ Kosong, 7 April: 19.0 µg/m³ Kosong, 8 April: 25.0 µg/m³, 2.3× its usual 10.8 Kosong, 9 April: 7.9 µg/m³ Kosong, 10 April: 9.0 µg/m³ Kosong, 11 April: 18.5 µg/m³ Kosong, 12 April: no reading Yŏnmu Yŏnmu, 3 April: 7.9 µg/m³ Yŏnmu, 4 April: 11.7 µg/m³ Yŏnmu, 5 April: 15.7 µg/m³ Yŏnmu, 6 April: 29.4 µg/m³ Yŏnmu, 7 April: 30.3 µg/m³ Yŏnmu, 8 April: 32.5 µg/m³ Yŏnmu, 9 April: 41.6 µg/m³, 2.0× its usual 20.6 Yŏnmu, 10 April: 26.8 µg/m³ Yŏnmu, 11 April: 21.0 µg/m³ Yŏnmu, 12 April: no reading Nonsan Nonsan, 3 April: 7.0 µg/m³ Nonsan, 4 April: 15.0 µg/m³ Nonsan, 5 April: 19.1 µg/m³ Nonsan, 6 April: 31.0 µg/m³ Nonsan, 7 April: 33.0 µg/m³ Nonsan, 8 April: 30.0 µg/m³ Nonsan, 9 April: 40.9 µg/m³, 2.1× its usual 19.2 Nonsan, 10 April: 26.4 µg/m³ Nonsan, 11 April: 23.3 µg/m³ Nonsan, 12 April: no reading Namsa Namsa, 3 April: 9.0 µg/m³ Namsa, 4 April: 16.0 µg/m³ Namsa, 5 April: 18.8 µg/m³ Namsa, 6 April: 30.9 µg/m³ Namsa, 7 April: 29.8 µg/m³ Namsa, 8 April: 29.8 µg/m³ Namsa, 9 April: 40.7 µg/m³, 2.1× its usual 19.5 Namsa, 10 April: 25.0 µg/m³ Namsa, 11 April: 20.6 µg/m³ Namsa, 12 April: no reading Boryeong Boryeong, 3 April: 7.3 µg/m³ Boryeong, 4 April: 19.6 µg/m³ Boryeong, 5 April: 21.8 µg/m³ Boryeong, 6 April: 32.1 µg/m³ Boryeong, 7 April: 31.2 µg/m³ Boryeong, 8 April: 20.9 µg/m³ Boryeong, 9 April: 39.9 µg/m³, 2.1× its usual 18.9 Boryeong, 10 April: 19.5 µg/m³ Boryeong, 11 April: 18.2 µg/m³ Boryeong, 12 April: no reading Buyeo Buyeo, 3 April: 7.3 µg/m³ Buyeo, 4 April: 9.3 µg/m³ Buyeo, 5 April: 14.5 µg/m³ Buyeo, 6 April: 23.7 µg/m³ Buyeo, 7 April: 25.0 µg/m³ Buyeo, 8 April: 21.6 µg/m³ Buyeo, 9 April: 38.1 µg/m³, 2.4× its usual 16.0 Buyeo, 10 April: 29.5 µg/m³ Buyeo, 11 April: 19.6 µg/m³ Buyeo, 12 April: no reading Jeonju Jeonju, 3 April: 8.0 µg/m³ Jeonju, 4 April: 15.1 µg/m³ Jeonju, 5 April: 18.4 µg/m³ Jeonju, 6 April: 25.2 µg/m³ Jeonju, 7 April: 27.5 µg/m³ Jeonju, 8 April: 28.5 µg/m³ Jeonju, 9 April: 36.7 µg/m³, 2.1× its usual 17.1 Jeonju, 10 April: 24.1 µg/m³ Jeonju, 11 April: 18.4 µg/m³ Jeonju, 12 April: no reading Imsil Imsil, 3 April: 6.9 µg/m³ Imsil, 4 April: 9.5 µg/m³ Imsil, 5 April: 19.1 µg/m³ Imsil, 6 April: 22.2 µg/m³ Imsil, 7 April: 27.6 µg/m³ Imsil, 8 April: 27.2 µg/m³ Imsil, 9 April: 34.0 µg/m³, 2.2× its usual 15.3 Imsil, 10 April: 18.1 µg/m³ Imsil, 11 April: 20.9 µg/m³ 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
Buyeo Chungcheongnam-do, South Korea 1 9 April 16.0 2.4× Geoje Gyeongsangnam-do, South Korea 1 8 April 15.0 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× Wabu Gyeonggi-do, South Korea 2 6 April 18.8 2.2× Gongju Chungcheongnam-do, South Korea 1 7 April 17.1 2.2× Imsil Jeollabuk-do, South Korea 1 9 April 15.3 2.2× Hwacheon Gangwon-do, South Korea 1 7 April 14.4 2.2× Yeosu Jeollanam-do, South Korea 1 8 April 14.0 2.2× Anseong Gyeonggi-do, South Korea 1 6 April 21.1 2.1× Nonsan Chungcheongnam-do, South Korea 1 9 April 19.2 2.1× Namsa Jeollabuk-do, South Korea 1 9 April 19.5 2.1× Boryeong Chungcheongnam-do, South Korea 1 9 April 18.9 2.1× Jeonju Jeollabuk-do, South Korea 1 9 April 17.1 2.1× Sokcho Gangwon-do, South Korea 1 8 April 16.1 2.1× Hongch’ŏn Gangwon-do, South Korea 2 7 April 16.4 2.1× Ungsang Gyeongsangnam-do, South Korea 1 8 April 16.0 2.1× Gangneung Gangwon-do, South Korea 1 8 April 14.9 2.1× Seonghwan Chungcheongnam-do, South Korea 1 6 April 27.2 2.0× Yŏnmu Chungcheongnam-do, South Korea 1 9 April 20.6 2.0× Ulsan Ulsan, South Korea 1 8 April 19.3 2.0× Okcheon North Chungcheong, South Korea 1 8 April 18.0 2.0× Mungyeong Gyeongsangbuk-do, South Korea 1 8 April 17.5 2.0× Yangju Gyeonggi-do, South Korea 1 7 April 17.1 2.0× Taesal-li Chungcheongnam-do, South Korea 1 6 April 16.3 2.0× Gyeongju Gyeongsangbuk-do, South Korea 1 8 April 15.7 2.0× Eisen Gyeongsangbuk-do, South Korea 1 8 April 15.7 2.0× Suncheon Jeollanam-do, South Korea 1 8 April 14.6 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 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, 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, 6 to 9 April 2024 28 Bars: cities reached; colour: the level of the episode's highest daily reading. All 63 .
Use this page SmogRank, South Korea, 6 to 9 April 2024: 28 cities with PM2.5 at twice their usual or more, 6 to 9 April 2024, smogrank.com/episodes/2024-04-06-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.
