SmogRank / Episodes / South Korea
South Korea, 23 to 25 July 2025
For 3 days, from 23 to 25 July 2025, 25 cities in South Korea had PM2.5 at least twice their usual for the time of year. The worst reading was Gunsan, Jeollabuk-do, South Korea: 37.6 µg/m³ on 25 July, about 3.4× its usual 11.2.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 25 in 1 country
Days 3 23 to 25 July 2025
Worst day 24 July 13 cities counted
Furthest above usual 3.4× Gunsan
Day by day
Play 24 July 13 cities at twice their usual or more
Yeongdong Gimcheon Sangju Okcheon Kinzan Gumi Mungyeong Daejeon Waegwan Cheongju-si Koesan Jinan-gun Jungpyong Kunwi Changsu Yecheon Sejong Chungju Chinch'ŏn Yŏnmu Gongju Nonsan Wanju Jeonju Imsil Andong Namsa Yeongju Cheonan Nangen Iksan Buyeo Anseong Chinju Seonghwan Eisen Asan Kurye Yeoju Neietsu Wŏnju Pubal Yesan Icheon-si Cheongsong gun Osan Damyang Hongseong Goseong Boryeong Yangp'yŏng Gwangju Gyeongju Kimhae Suwon Yangsan Koch'ang Yeonil Tangjin Seongnam-si Jangseong Gwangju Tongyeong Hwasun Pohang Beolgyo Hongch’ŏn Hanam Ungsang Sinhyeon Masan Anyang-si Wabu Ansan-si Hwado Seosan Namyangju Guri-si Geoje Gijang Gwangmyeong Taesal-li Seoul Gapyeong Chuncheon Naju Bucheon-si Incheon Uijeongbu-si Santyoku Goyang-si Donghae City Gangneung Yangju Gimpo-si Yeongam Muan Yanggu Hwacheon Jumunjin Munsan Mokpo Haenam Cheorwon Sokcho Kosong Sinan Tsushima Iki Munakata Koga Nakama Nagato Kitakyushu Shimonoseki Mine Kanda Hagi Onoda Ube Yamaguchi Masuda Hōfu Hamada Shūnan Gōtsuchō Kudamatsu Hikari Ōdachō-ōda Ōtake Yanai Iwakuni Yae Hiroshima Gion Izumo Kure Unnan Miyoshi Higashihiroshima Takehara Matsuyama Hayang Ganghwa-gun Naesŏ Changwon Ulsan Hwaseong-si Busan Pyeongtaek Jeongeup Hadong Yeonggwang Gwangyang Miryang Kimje Changnyeong Jangheung Kwangyang Buan Boseong Yeosu Suncheon Gyeongsan-si Hwawŏn Daegu Gunsan 20 Jul 21 22 23 24 25 26 27 28 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
Miryang Miryang, 20 July: 7.6 µg/m³ Miryang, 21 July: 8.3 µg/m³ Miryang, 22 July: 13.2 µg/m³ Miryang, 23 July: 28.8 µg/m³, 2.7× its usual 10.6 Miryang, 24 July: 25.9 µg/m³, 2.5× its usual 10.5 Miryang, 25 July: 11.1 µg/m³ Miryang, 26 July: 4.4 µg/m³ Miryang, 27 July: 4.8 µg/m³ Miryang, 28 July: 6.6 µg/m³ Ulsan Ulsan, 20 July: 11.0 µg/m³ Ulsan, 21 July: 10.5 µg/m³ Ulsan, 22 July: 16.7 µg/m³ Ulsan, 23 July: 28.6 µg/m³, 2.3× its usual 12.6 Ulsan, 24 July: 18.7 µg/m³ Ulsan, 25 July: 11.1 µg/m³ Ulsan, 26 July: 10.3 µg/m³ Ulsan, 27 July: 9.0 µg/m³ Ulsan, 28 July: 10.0 µg/m³ Changnyeong Changnyeong, 20 July: 9.1 µg/m³ Changnyeong, 21 July: 9.7 µg/m³ Changnyeong, 22 July: 15.8 µg/m³ Changnyeong, 23 July: 28.1 µg/m³, 2.4× its usual 11.6 Changnyeong, 24 July: 32.3 µg/m³, 2.8× its usual 11.6 Changnyeong, 25 July: 10.5 µg/m³ Changnyeong, 26 July: 5.3 µg/m³ Changnyeong, 27 July: 4.9 µg/m³ Changnyeong, 28 July: 5.7 µg/m³ Busan Busan, 20 July: 10.3 µg/m³ Busan, 21 July: 8.5 µg/m³ Busan, 22 July: 13.4 µg/m³ Busan, 23 July: 26.3 µg/m³, 2.4× its usual 10.8 Busan, 24 July: 12.2 µg/m³ Busan, 25 July: 5.8 µg/m³ Busan, 26 July: 5.9 µg/m³ Busan, 27 July: 4.4 µg/m³ Busan, 28 July: 6.4 µg/m³ Changwon Changwon, 20 July: 9.4 µg/m³ Changwon, 21 July: 8.1 µg/m³ Changwon, 22 July: 13.7 µg/m³ Changwon, 23 July: 25.4 µg/m³, 2.3× its usual 10.9 Changwon, 24 July: 19.5 µg/m³ Changwon, 25 July: 7.9 µg/m³ Changwon, 26 July: 5.5 µg/m³ Changwon, 27 July: 4.5 µg/m³ Changwon, 28 July: 8.1 µg/m³ Naesŏ Naesŏ, 20 July: 10.1 µg/m³ Naesŏ, 21 July: 7.9 µg/m³ Naesŏ, 22 July: 15.0 µg/m³ Naesŏ, 23 July: 25.0 µg/m³, 2.3× its usual 11.0 Naesŏ, 24 July: 20.3 µg/m³ Naesŏ, 25 July: 8.0 µg/m³ Naesŏ, 26 July: 5.3 µg/m³ Naesŏ, 27 July: 5.3 µg/m³ Naesŏ, 28 July: 7.4 µg/m³ Hwawŏn Hwawŏn, 20 July: 9.1 µg/m³ Hwawŏn, 21 July: 8.9 µg/m³ Hwawŏn, 22 July: 12.5 µg/m³ Hwawŏn, 23 July: 20.8 µg/m³ Hwawŏn, 24 July: 30.5 µg/m³, 3.2× its usual 9.4 Hwawŏn, 25 July: 14.0 µg/m³ Hwawŏn, 26 July: 7.5 µg/m³ Hwawŏn, 27 July: 8.0 µg/m³ Hwawŏn, 28 July: 10.1 µg/m³ Daegu Daegu, 20 July: 8.7 µg/m³ Daegu, 21 July: 8.5 µg/m³ Daegu, 22 July: 12.7 µg/m³ Daegu, 23 July: 21.1 µg/m³ Daegu, 24 July: 27.8 µg/m³, 3.4× its usual 8.2 Daegu, 25 July: 9.8 µg/m³ Daegu, 26 July: 5.6 µg/m³ Daegu, 27 July: 4.5 µg/m³ Daegu, 28 July: 7.9 µg/m³ Hayang Hayang, 20 July: 11.1 µg/m³ Hayang, 21 July: 11.1 µg/m³ Hayang, 22 July: 14.3 µg/m³ Hayang, 23 July: 25.9 µg/m³ Hayang, 24 July: 27.8 µg/m³, 2.0× its usual 13.7 Hayang, 25 July: 14.1 µg/m³ Hayang, 26 July: 11.0 µg/m³ Hayang, 27 July: 9.2 µg/m³ Hayang, 28 July: 11.2 µg/m³ Kwangyang Kwangyang, 20 July: 9.4 µg/m³ Kwangyang, 21 July: 5.3 µg/m³ Kwangyang, 22 July: 8.2 µg/m³ Kwangyang, 23 July: 19.8 µg/m³ Kwangyang, 24 July: 27.2 µg/m³, 2.9× its usual 9.3 Kwangyang, 25 July: 10.9 µg/m³ Kwangyang, 26 July: 5.4 µg/m³ Kwangyang, 27 July: 4.9 µg/m³ Kwangyang, 28 July: 8.8 µg/m³ Gwangyang Gwangyang, 20 July: 9.0 µg/m³ Gwangyang, 21 July: 7.4 µg/m³ Gwangyang, 22 July: 9.1 µg/m³ Gwangyang, 23 July: 21.8 µg/m³ Gwangyang, 24 July: 27.2 µg/m³, 2.7× its usual 10.0 Gwangyang, 25 July: 9.7 µg/m³ Gwangyang, 26 July: 5.5 µg/m³ Gwangyang, 27 July: 5.0 µg/m³ Gwangyang, 28 July: 8.3 µg/m³ Gyeongsan-si Gyeongsan-si, 20 July: 7.7 µg/m³ Gyeongsan-si, 21 July: 5.9 µg/m³ Gyeongsan-si, 22 July: 10.5 µg/m³ Gyeongsan-si, 23 July: 22.7 µg/m³ Gyeongsan-si, 24 July: 27.0 µg/m³, 3.2× its usual 8.5 Gyeongsan-si, 25 July: 8.5 µg/m³ Gyeongsan-si, 26 July: 5.3 µg/m³ Gyeongsan-si, 27 July: 2.9 µg/m³ Gyeongsan-si, 28 July: 5.7 µg/m³ Hadong Hadong, 20 July: 7.3 µg/m³ Hadong, 21 July: 6.8 µg/m³ Hadong, 22 July: 10.7 µg/m³ Hadong, 23 July: 22.1 µg/m³ Hadong, 24 July: 27.0 µg/m³, 2.5× its usual 10.8 Hadong, 25 July: 10.5 µg/m³ Hadong, 26 July: 5.1 µg/m³ Hadong, 27 July: 4.0 µg/m³ Hadong, 28 July: 7.5 µg/m³ Boseong Boseong, 20 July: 7.0 µg/m³ Boseong, 21 July: 4.8 µg/m³ Boseong, 22 July: 7.7 µg/m³ Boseong, 23 July: 12.8 µg/m³ Boseong, 24 July: 26.9 µg/m³, 3.0× its usual 8.9 Boseong, 25 July: 17.9 µg/m³ Boseong, 26 July: 7.5 µg/m³ Boseong, 27 July: 6.5 µg/m³ Boseong, 28 July: 7.4 µg/m³ Jangheung Jangheung, 20 July: 9.9 µg/m³ Jangheung, 21 July: 5.5 µg/m³ Jangheung, 22 July: 9.7 µg/m³ Jangheung, 23 July: 15.2 µg/m³ Jangheung, 24 July: 26.7 µg/m³, 2.9× its usual 9.2 Jangheung, 25 July: 20.4 µg/m³ Jangheung, 26 July: 8.9 µg/m³ Jangheung, 27 July: 6.7 µg/m³ Jangheung, 28 July: 10.3 µg/m³ Suncheon Suncheon, 20 July: 9.8 µg/m³ Suncheon, 21 July: 5.0 µg/m³ Suncheon, 22 July: 7.1 µg/m³ Suncheon, 23 July: 16.0 µg/m³ Suncheon, 24 July: 26.4 µg/m³, 3.1× its usual 8.6 Suncheon, 25 July: 11.9 µg/m³ Suncheon, 26 July: 4.4 µg/m³ Suncheon, 27 July: 3.5 µg/m³ Suncheon, 28 July: 7.4 µg/m³ Yeosu Yeosu, 20 July: 9.3 µg/m³ Yeosu, 21 July: 6.5 µg/m³ Yeosu, 22 July: 8.5 µg/m³ Yeosu, 23 July: 17.0 µg/m³ Yeosu, 24 July: 25.6 µg/m³, 3.1× its usual 8.2 Yeosu, 25 July: 9.1 µg/m³ Yeosu, 26 July: 6.8 µg/m³ Yeosu, 27 July: 5.1 µg/m³ Yeosu, 28 July: 7.5 µg/m³ Gunsan Gunsan, 20 July: 10.3 µg/m³ Gunsan, 21 July: 7.2 µg/m³ Gunsan, 22 July: 5.5 µg/m³ Gunsan, 23 July: 9.9 µg/m³ Gunsan, 24 July: 20.7 µg/m³ Gunsan, 25 July: 37.6 µg/m³, 3.4× its usual 11.2 Gunsan, 26 July: 24.7 µg/m³ Gunsan, 27 July: 8.9 µg/m³ Gunsan, 28 July: 16.3 µg/m³ Buan Buan, 20 July: 10.3 µg/m³ Buan, 21 July: 8.6 µg/m³ Buan, 22 July: 6.3 µg/m³ Buan, 23 July: 12.5 µg/m³ Buan, 24 July: 21.0 µg/m³ Buan, 25 July: 33.4 µg/m³, 2.9× its usual 11.6 Buan, 26 July: 20.0 µg/m³ Buan, 27 July: 9.0 µg/m³ Buan, 28 July: 16.2 µg/m³ Jeongeup Jeongeup, 20 July: 11.4 µg/m³ Jeongeup, 21 July: 8.5 µg/m³ Jeongeup, 22 July: 8.0 µg/m³ Jeongeup, 23 July: 12.8 µg/m³ Jeongeup, 24 July: 23.3 µg/m³ Jeongeup, 25 July: 31.8 µg/m³, 2.4× its usual 13.4 Jeongeup, 26 July: 13.8 µg/m³ Jeongeup, 27 July: 7.3 µg/m³ Jeongeup, 28 July: 15.1 µg/m³ Kimje Kimje, 20 July: 11.5 µg/m³ Kimje, 21 July: 7.5 µg/m³ Kimje, 22 July: 7.1 µg/m³ Kimje, 23 July: 14.7 µg/m³ Kimje, 24 July: 22.1 µg/m³ Kimje, 25 July: 30.6 µg/m³, 2.8× its usual 11.0 Kimje, 26 July: 14.4 µg/m³ Kimje, 27 July: 9.4 µg/m³ Kimje, 28 July: 16.5 µg/m³ Pyeongtaek Pyeongtaek, 20 July: 8.3 µg/m³ Pyeongtaek, 21 July: 10.1 µg/m³ Pyeongtaek, 22 July: 8.0 µg/m³ Pyeongtaek, 23 July: 14.5 µg/m³ Pyeongtaek, 24 July: 17.9 µg/m³ Pyeongtaek, 25 July: 27.2 µg/m³, 2.4× its usual 11.2 Pyeongtaek, 26 July: 14.3 µg/m³ Pyeongtaek, 27 July: 12.7 µg/m³ Pyeongtaek, 28 July: 25.0 µg/m³ Yeonggwang Yeonggwang, 20 July: 9.3 µg/m³ Yeonggwang, 21 July: 7.0 µg/m³ Yeonggwang, 22 July: 7.3 µg/m³ Yeonggwang, 23 July: 11.4 µg/m³ Yeonggwang, 24 July: 18.5 µg/m³ Yeonggwang, 25 July: 26.8 µg/m³, 2.6× its usual 10.3 Yeonggwang, 26 July: 15.6 µg/m³ Yeonggwang, 27 July: 8.3 µg/m³ Yeonggwang, 28 July: 12.8 µg/m³ Ganghwa-gun Ganghwa-gun, 20 July: 9.9 µg/m³ Ganghwa-gun, 21 July: 14.0 µg/m³ Ganghwa-gun, 22 July: 7.9 µg/m³ Ganghwa-gun, 23 July: 7.0 µg/m³ Ganghwa-gun, 24 July: 13.4 µg/m³ Ganghwa-gun, 25 July: 25.9 µg/m³, 2.1× its usual 12.2 Ganghwa-gun, 26 July: 32.1 µg/m³ Ganghwa-gun, 27 July: 27.7 µg/m³ Ganghwa-gun, 28 July: 36.2 µg/m³ Hwaseong-si Hwaseong-si, 20 July: 7.8 µg/m³ Hwaseong-si, 21 July: 9.2 µg/m³ Hwaseong-si, 22 July: 7.1 µg/m³ Hwaseong-si, 23 July: 10.5 µg/m³ Hwaseong-si, 24 July: 13.4 µg/m³ Hwaseong-si, 25 July: 25.2 µg/m³, 2.4× its usual 10.7 Hwaseong-si, 26 July: 21.9 µg/m³ Hwaseong-si, 27 July: 15.2 µg/m³ Hwaseong-si, 28 July: 23.0 µg/m³ 20 Jul 21 22 23 24 25 26 27 28 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
Gunsan Jeollabuk-do, South Korea 1 25 July 11.2 3.4× Daegu Daegu, South Korea 1 24 July 8.2 3.4× Hwawŏn Daegu, South Korea 1 24 July 9.4 3.2× Gyeongsan-si Gyeongsangbuk-do, South Korea 1 24 July 8.5 3.2× Suncheon Jeollanam-do, South Korea 1 24 July 8.6 3.1× Yeosu Jeollanam-do, South Korea 1 24 July 8.2 3.1× Boseong Jeollanam-do, South Korea 1 24 July 8.9 3.0× Buan Jeollabuk-do, South Korea 1 25 July 11.6 2.9× Kwangyang Jeollanam-do, South Korea 1 24 July 9.3 2.9× Jangheung Jeollanam-do, South Korea 1 24 July 9.2 2.9× Changnyeong Gyeongsangnam-do, South Korea 2 24 July 11.6 2.8× Kimje Jeollabuk-do, South Korea 1 25 July 11.0 2.8× Miryang Gyeongsangnam-do, South Korea 2 23 July 10.6 2.7× Gwangyang Jeollanam-do, South Korea 1 24 July 10.0 2.7× Yeonggwang Jeollanam-do, South Korea 1 25 July 10.3 2.6× Hadong Gyeongsangnam-do, South Korea 1 24 July 10.8 2.5× Jeongeup Jeollabuk-do, South Korea 1 25 July 13.4 2.4× Pyeongtaek Gyeonggi-do, South Korea 1 25 July 11.2 2.4× Busan Busan, South Korea 1 23 July 10.8 2.4× Hwaseong-si Gyeonggi-do, South Korea 1 25 July 10.7 2.4× Ulsan Ulsan, South Korea 1 23 July 12.6 2.3× Changwon Gyeongsangnam-do, South Korea 1 23 July 10.9 2.3× Naesŏ Gyeongsangnam-do, South Korea 1 23 July 11.0 2.3× Ganghwa-gun Incheon, South Korea 1 25 July 12.2 2.1× Hayang Gyeongsangbuk-do, South Korea 1 24 July 13.7 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 40 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, 23 to 25 July 2025 25 Bars: cities reached; colour: the level of the episode's highest daily reading. All 63 .
Use this page SmogRank, South Korea, 23 to 25 July 2025: 25 cities with PM2.5 at twice their usual or more, 23 to 25 July 2025, smogrank.com/episodes/2025-07-23-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.
