SmogRank / Episodes / South Korea
Gyeonggi-do and Jeollabuk-do, South Korea, April 2024
For 1 day, on 30 April 2024, 15 cities in South Korea had PM2.5 at least twice their usual for the time of year. The worst reading was Goyang-si, Gyeonggi-do, South Korea: 36.8 µg/m³ on 30 April, about 2.3× its usual 16.3.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 15 in 1 country
Days 1 30 April 2024
Worst day 30 April 15 cities counted
Furthest above usual 2.3× Uijeongbu-si
Day by day
Play 30 April 15 cities at twice their usual or more
Boryeong Buyeo Gunsan Hongseong Nonsan Iksan Yŏnmu Yesan Gongju Namsa Kimje Buan Seosan Asan Wanju Jeonju Tangjin Sejong Jeongeup Daejeon Cheonan Taesal-li Seonghwan Kinzan Pyeongtaek Jinan-gun Okcheon Cheongju-si Anseong Chinch'ŏn Jangseong Osan Damyang Yeonggwang Changsu Jungpyong Ansan-si Suwon Yeongdong Nangen Gwangju Masan Incheon Naju Hwasun Koesan Seongnam-si Icheon-si Gwangju Muan Kurye Pubal Hanam Yeoju Chungju Gimcheon Wabu Yeongam Yangp'yŏng Sangju Mokpo Ganghwa-gun Hwado Suncheon Boseong Mungyeong Beolgyo Kwangyang Hadong Munsan Gumi Gwangyang Wŏnju Haenam Waegwan Chinju Gapyeong Yeosu Yecheon Hwawŏn Hongch’ŏn Kunwi Chuncheon Daegu Changnyeong Neietsu Yeongju Cheorwon Andong Goseong Naesŏ Gyeongsan-si Hwacheon Hayang Miryang Tongyeong Changwon Eisen Yanggu Cheongsong gun Sinhyeon Kimhae T’aebaek Geoje Yangsan Gyeongju Busan Ungsang Yeonil Gangneung Pohang Jumunjin Gijang Ulsan Sokcho Donghae City Santyoku Kosong Tsushima Koga Nakama Kitakyushu Shimonoseki Nagato Mine Onoda Ube Anyang-si Jangheung Hwaseong-si Gimpo-si Guri-si Imsil Koch'ang Bucheon-si Seoul Yangju Sinan Gwangmyeong Namyangju Goyang-si Uijeongbu-si 27 Apr 28 29 30 1 May 2 3 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
Goyang-si Goyang-si, 27 April: 18.0 µg/m³, 1.1× usual Goyang-si, 28 April: 21.5 µg/m³, 1.3× usual Goyang-si, 29 April: 20.8 µg/m³, 1.3× usual Goyang-si, 30 April: 36.8 µg/m³, 2.3× usual Goyang-si, 1 May: 16.0 µg/m³, 1.0× usual Goyang-si, 2 May: 19.7 µg/m³, 1.2× usual Goyang-si, 3 May: 22.0 µg/m³, 1.3× usual Gimpo-si Gimpo-si, 27 April: 24.8 µg/m³, 1.4× usual Gimpo-si, 28 April: 21.3 µg/m³, 1.2× usual Gimpo-si, 29 April: 22.2 µg/m³, 1.3× usual Gimpo-si, 30 April: 35.3 µg/m³, 2.0× usual Gimpo-si, 1 May: 16.5 µg/m³, 0.9× usual Gimpo-si, 2 May: 20.9 µg/m³, 1.2× usual Gimpo-si, 3 May: 22.7 µg/m³, 1.3× usual Seoul Seoul, 27 April: 20.2 µg/m³, 1.3× usual Seoul, 28 April: 20.9 µg/m³, 1.3× usual Seoul, 29 April: 20.4 µg/m³, 1.3× usual Seoul, 30 April: 34.1 µg/m³, 2.1× usual Seoul, 1 May: 14.2 µg/m³, 0.9× usual Seoul, 2 May: 18.5 µg/m³, 1.2× usual Seoul, 3 May: 25.7 µg/m³, 1.6× usual Hwaseong-si Hwaseong-si, 27 April: no reading Hwaseong-si, 28 April: no reading Hwaseong-si, 29 April: 23.3 µg/m³, 1.4× usual Hwaseong-si, 30 April: 33.8 µg/m³, 2.0× usual Hwaseong-si, 1 May: 19.0 µg/m³, 1.1× usual Hwaseong-si, 2 May: 21.5 µg/m³, 1.3× usual Hwaseong-si, 3 May: 24.2 µg/m³, 1.5× usual Uijeongbu-si Uijeongbu-si, 27 April: 12.8 µg/m³, 0.9× usual Uijeongbu-si, 28 April: 16.4 µg/m³, 1.1× usual Uijeongbu-si, 29 April: 17.8 µg/m³, 1.2× usual Uijeongbu-si, 30 April: 33.5 µg/m³, 2.3× usual Uijeongbu-si, 1 May: 12.1 µg/m³, 0.8× usual Uijeongbu-si, 2 May: 15.8 µg/m³, 1.1× usual Uijeongbu-si, 3 May: 20.2 µg/m³, 1.4× usual Bucheon-si Bucheon-si, 27 April: 28.1 µg/m³, 1.7× usual Bucheon-si, 28 April: 22.6 µg/m³, 1.4× usual Bucheon-si, 29 April: 19.7 µg/m³, 1.2× usual Bucheon-si, 30 April: 33.5 µg/m³, 2.1× usual Bucheon-si, 1 May: 15.3 µg/m³, 1.0× usual Bucheon-si, 2 May: 19.1 µg/m³, 1.2× usual Bucheon-si, 3 May: 23.6 µg/m³, 1.5× usual Gwangmyeong Gwangmyeong, 27 April: 30.3 µg/m³, 2.0× usual Gwangmyeong, 28 April: 23.5 µg/m³, 1.6× usual Gwangmyeong, 29 April: 21.1 µg/m³, 1.4× usual Gwangmyeong, 30 April: 33.3 µg/m³, 2.2× usual Gwangmyeong, 1 May: 16.4 µg/m³, 1.1× usual Gwangmyeong, 2 May: 20.6 µg/m³, 1.4× usual Gwangmyeong, 3 May: 26.1 µg/m³, 1.7× usual Guri-si Guri-si, 27 April: 17.3 µg/m³, 1.1× usual Guri-si, 28 April: 19.2 µg/m³, 1.2× usual Guri-si, 29 April: 19.0 µg/m³, 1.2× usual Guri-si, 30 April: 32.6 µg/m³, 2.0× usual Guri-si, 1 May: 13.1 µg/m³, 0.8× usual Guri-si, 2 May: 18.2 µg/m³, 1.1× usual Guri-si, 3 May: 24.7 µg/m³, 1.5× usual Anyang-si Anyang-si, 27 April: 27.1 µg/m³, 1.8× usual Anyang-si, 28 April: 18.6 µg/m³, 1.2× usual Anyang-si, 29 April: 19.7 µg/m³, 1.3× usual Anyang-si, 30 April: 31.1 µg/m³, 2.0× usual Anyang-si, 1 May: 17.0 µg/m³, 1.1× usual Anyang-si, 2 May: 18.5 µg/m³, 1.2× usual Anyang-si, 3 May: 21.9 µg/m³, 1.4× usual Namyangju Namyangju, 27 April: 15.3 µg/m³, 1.1× usual Namyangju, 28 April: 16.5 µg/m³, 1.2× usual Namyangju, 29 April: 17.4 µg/m³, 1.3× usual Namyangju, 30 April: 30.6 µg/m³, 2.2× usual Namyangju, 1 May: 11.8 µg/m³, 0.9× usual Namyangju, 2 May: 15.8 µg/m³, 1.2× usual Namyangju, 3 May: 20.8 µg/m³, 1.5× usual Sinan Sinan, 27 April: 9.0 µg/m³, 0.7× usual Sinan, 28 April: 10.0 µg/m³, 0.8× usual Sinan, 29 April: 15.2 µg/m³, 1.2× usual Sinan, 30 April: 27.6 µg/m³, 2.2× usual Sinan, 1 May: 18.3 µg/m³, 1.4× usual Sinan, 2 May: 20.3 µg/m³, 1.6× usual Sinan, 3 May: 17.9 µg/m³, 1.4× usual Imsil Imsil, 27 April: 12.8 µg/m³, 1.1× usual Imsil, 28 April: 13.3 µg/m³, 1.1× usual Imsil, 29 April: 13.0 µg/m³, 1.1× usual Imsil, 30 April: 26.0 µg/m³, 2.1× usual Imsil, 1 May: 14.6 µg/m³, 1.2× usual Imsil, 2 May: 17.8 µg/m³, 1.5× usual Imsil, 3 May: 19.0 µg/m³, 1.6× usual Jangheung Jangheung, 27 April: 14.1 µg/m³, 1.1× usual Jangheung, 28 April: 14.4 µg/m³, 1.1× usual Jangheung, 29 April: 11.2 µg/m³, 0.9× usual Jangheung, 30 April: 25.9 µg/m³, 2.0× usual Jangheung, 1 May: 14.8 µg/m³, 1.2× usual Jangheung, 2 May: 15.0 µg/m³, 1.2× usual Jangheung, 3 May: 21.6 µg/m³, 1.7× usual Yangju Yangju, 27 April: 12.5 µg/m³, 1.0× usual Yangju, 28 April: 13.6 µg/m³, 1.1× usual Yangju, 29 April: 15.1 µg/m³, 1.2× usual Yangju, 30 April: 25.6 µg/m³, 2.1× usual Yangju, 1 May: 9.7 µg/m³, 0.8× usual Yangju, 2 May: 14.8 µg/m³, 1.2× usual Yangju, 3 May: 18.5 µg/m³, 1.5× usual Koch'ang Koch'ang, 27 April: 9.8 µg/m³, 0.8× usual Koch'ang, 28 April: 13.4 µg/m³, 1.1× usual Koch'ang, 29 April: 20.5 µg/m³, 1.7× usual Koch'ang, 30 April: 25.3 µg/m³, 2.1× usual Koch'ang, 1 May: 17.5 µg/m³, 1.4× usual Koch'ang, 2 May: 21.0 µg/m³, 1.7× usual Koch'ang, 3 May: 19.6 µg/m³, 1.6× usual 27 Apr 28 29 30 1 May 2 3 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
Uijeongbu-si Gyeonggi-do, South Korea 1 30 April 14.7 2.3× Goyang-si Gyeonggi-do, South Korea 1 30 April 16.3 2.3× Namyangju Gyeonggi-do, South Korea 1 30 April 13.7 2.2× Gwangmyeong Gyeonggi-do, South Korea 1 30 April 15.1 2.2× Sinan Jeollanam-do, South Korea 1 30 April 12.8 2.2× Imsil Jeollabuk-do, South Korea 1 30 April 12.1 2.1× Seoul Seoul, South Korea 1 30 April 16.0 2.1× Yangju Gyeonggi-do, South Korea 1 30 April 12.3 2.1× Bucheon-si Gyeonggi-do, South Korea 1 30 April 16.1 2.1× Koch'ang Jeollabuk-do, South Korea 1 30 April 12.2 2.1× Jangheung Jeollanam-do, South Korea 1 30 April 12.7 2.0× Hwaseong-si Gyeonggi-do, South Korea 1 30 April 16.6 2.0× Anyang-si Gyeonggi-do, South Korea 1 30 April 15.3 2.0× Guri-si Gyeonggi-do, South Korea 1 30 April 16.1 2.0× Gimpo-si Gyeonggi-do, South Korea 1 30 April 17.5 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 53 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 Gyeonggi-do and Jeollabuk-do, South Korea, April 2024 15 Bars: cities reached; colour: the level of the episode's highest daily reading. All 63 .
Use this page SmogRank, Gyeonggi-do and Jeollabuk-do, South Korea, April 2024: 15 cities with PM2.5 at twice their usual or more, 30 April 2024, smogrank.com/episodes/2024-04-gyeonggi-do-and-jeollabuk-do-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.
