SmogRank / Episodes / Japan
Japan and South Korea, April 2025
For 2 days, from 25 to 26 April 2025, 86 cities in Japan and South Korea had PM2.5 at least twice their usual for the time of year. The worst reading was Yangp'yŏng, Gyeonggi-do, South Korea: 45.2 µg/m³ on 25 April, about 2.8× its usual 16.0.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 86 in 2 countries
Days 2 25 to 26 April 2025
Worst day 25 April 72 cities counted
Furthest above usual 3.7× Ōdachō-ōda
Day by day
Play 25 April 72 cities at twice their usual or more
Yamaguchi Ōtake Iwakuni Shūnan Hōfu Kudamatsu Hikari Yanai Takehara Ube Mihara Shin’ichi Shimonoseki Fukuyama Kitakyushu Pohang Kanda Koga Imabari Yeonil Yukuhashi Nakama Ulsan Matsuyama Kunisaki Buzen Nōgata Munakata Iyo Tagawa Iizuka Koga Gijang Ungsang Saijō Niihama Wakasugi Yawatahama Fukuoka Yangsan Shinagawa Beppu Kan’onjichō Marugame Eisen Kasuga Tsurusaki Zentsujichó Ōita Shikokuchūō Hita Busan Ukiha Yufu Tanushimarumachi-toyoki Ogōri Maebaru-chūō Hayang Takinomiya Itoshima Tosu Kimhae Ikedachō Kurume Uwajima Gyeongsan-si Iki Yame Miryang Tsushima Kanzakimachi-kanzaki Donghae City Andong Hiragi Shido Ino Chikugo Karatsu Susaki Daegu Saga Kochi Changwon Taku Nankoku Ikaruga Yeongju Mima Hwawŏn Geoje Changnyeong Naesŏ Sinhyeon Imarichō-kō Himeji Waegwan Yoshinogawa Matsuura Kamojimachō-jōgejima Aki Kyōtango Tongyeong Nishiwaki Ono Tanba Tokushima Goseong Sangju Gimcheon Sumoto Chinju Kobe Sokcho Takarazuka Nishinomiya Minato Sennan Izumisano Yono Toyonaka Kainan Kishiwada Hadong Kameoka Iwade Osaka Sakai Izumi Gobō Gwangyang Obama Takatsuki Kinokawa Hirakata Changsu Sayama Yao Habikino Kwangyang Kyoto Tondabayashichō Kawachi-Nagano Cheongju-si Yeoju Jinan-gun Ikoma Kurye Uji Daejeon Hashimoto Jōyō Suncheon Hōryūji Chinch'ŏn Nangen Sugai Ōtsu Kitahama Tanabe Pubal Kizugawa Kashiwara Kashihara-shi Takashima Imsil Tenri Sejong Icheon-si Kusatsu Tsuruga Beolgyo Mikuni Anseong Jeonju Wanju Ōmihachiman Sabae Gongju Fukui-shi Yŏnmu Nonsan Cheonan Kōka Namsa Youkaichi Seonghwan Nabari Ueno-ebisumachi Iga Nagahama Hikone Hwado Pyeongtaek Kaga Iksan Hanam Asan Damyang Osan Boseong Seongnam-si Jeongeup Hwasun Kimje Guri-si Komatsu Gwangju Ono Suwon Yesan Shingū Masan Kameyama Kumano Jangseong Owase Jangheung Matsutō Uijeongbu-si Buan Anyang-si Seoul Gunsan Yangju Cheorwon Nonoichi Inabe Koch'ang Kanazawa Hwaseong-si Tsu Ansan-si Gwangmyeong Hongseong Naju Suzuka Yokkaichi Boryeong Kuwana Yeongam Goyang-si Bucheon-si Tangjin Tsubata Incheon Saikū Ichinomiya Yeonggwang Hakui Ama Gimpo-si Oyabe Haenam Ise Seosan Muan Taesal-li Tokoname Nagoya Inuyama Tonami Kaminoma Tōkai Anamizu Handa Toba Himimachi Mokpo Takaoka Nanao Kariya Owariasahi Shima Hekinan Nisshin Chiryū Ganghwa-gun Seto Minamichita Nishio Anjō Imizu Toyota Toyama Okazaki Sinan Gamagōri Jeju City Tahara Seogwipo Gaigeturi Wabu Yeosu Yecheon Kasaoka Gyeongju Wŏnju Asakuchi Namyangju Nakatsu Onoda Yawata Gumi Kunwi Munsan Amagasaki Kure Jumunjin Koesan Kinzan Gwangju Mungyeong Buyeo Santyoku Yeongdong Neietsu Higashiosaka Kakogawachō-honmachi Sōja Tamano Onomichi Jungpyong Gapyeong Kurashiki Takamatsu Bizen Cheongsong gun Chungju Gangneung Okcheon Narutochō-mitsuishi Higashihiroshima Matsusaka Hiroshima Okayama Arida Higashinozoe Akashi Tatsuno Mine Fukuchiyama Sandachō Tottori-shi Nantan Aioi Kariya Ayabe Kōtari Kurayoshi Maizuru Hongch’ŏn Yangp'yŏng Unnan Takahashi Yonago Hwacheon Nagato Hagi Miyazu Tsuyama Yasugichō Chuncheon Sakaiminato Toyooka Kosong Izumo Matsue Niimi Yanggu Anan Gion Masuda Miyoshi Gōtsuchō Yae Hamada Ōdachō-ōda 22 Apr 23 24 25 26 27 28 29 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
Yangp'yŏng Yangp'yŏng, 22 April: 9.9 µg/m³, 0.6× usual Yangp'yŏng, 23 April: 5.8 µg/m³, 0.4× usual Yangp'yŏng, 24 April: 22.5 µg/m³, 1.4× usual Yangp'yŏng, 25 April: 45.2 µg/m³, 2.8× usual Yangp'yŏng, 26 April: 14.5 µg/m³, 0.9× usual Yangp'yŏng, 27 April: 8.5 µg/m³, 0.5× usual Yangp'yŏng, 28 April: 13.7 µg/m³, 0.9× usual Yangp'yŏng, 29 April: 18.6 µg/m³, 1.2× usual Hongch’ŏn Hongch’ŏn, 22 April: 10.3 µg/m³, 0.7× usual Hongch’ŏn, 23 April: 2.8 µg/m³, 0.2× usual Hongch’ŏn, 24 April: 16.5 µg/m³, 1.2× usual Hongch’ŏn, 25 April: 39.0 µg/m³, 2.8× usual Hongch’ŏn, 26 April: 16.1 µg/m³, 1.1× usual Hongch’ŏn, 27 April: 9.5 µg/m³, 0.7× usual Hongch’ŏn, 28 April: 8.8 µg/m³, 0.6× usual Hongch’ŏn, 29 April: 14.6 µg/m³, 1.0× usual Chungju Chungju, 22 April: 7.9 µg/m³, 0.5× usual Chungju, 23 April: 5.0 µg/m³, 0.3× usual Chungju, 24 April: 17.0 µg/m³, 1.1× usual Chungju, 25 April: 38.7 µg/m³, 2.5× usual Chungju, 26 April: 11.8 µg/m³, 0.8× usual Chungju, 27 April: 6.4 µg/m³, 0.4× usual Chungju, 28 April: 12.1 µg/m³, 0.8× usual Chungju, 29 April: 19.0 µg/m³, 1.3× usual Yanggu Yanggu, 22 April: 8.8 µg/m³, 0.7× usual Yanggu, 23 April: 4.0 µg/m³, 0.3× usual Yanggu, 24 April: 15.7 µg/m³, 1.3× usual Yanggu, 25 April: 37.9 µg/m³, 3.2× usual Yanggu, 26 April: 17.6 µg/m³, 1.5× usual Yanggu, 27 April: 9.0 µg/m³, 0.8× usual Yanggu, 28 April: 9.0 µg/m³, 0.8× usual Yanggu, 29 April: 9.0 µg/m³, 0.8× usual Kinzan Kinzan, 22 April: 14.8 µg/m³, 0.9× usual Kinzan, 23 April: 16.0 µg/m³, 1.0× usual Kinzan, 24 April: 21.7 µg/m³, 1.3× usual Kinzan, 25 April: 37.8 µg/m³, 2.3× usual Kinzan, 26 April: 15.8 µg/m³, 1.0× usual Kinzan, 27 April: 14.0 µg/m³, 0.8× usual Kinzan, 28 April: 16.4 µg/m³, 1.0× usual Kinzan, 29 April: 23.5 µg/m³, 1.4× usual Gumi Gumi, 22 April: 18.4 µg/m³, 1.1× usual Gumi, 23 April: 13.6 µg/m³, 0.8× usual Gumi, 24 April: 25.2 µg/m³, 1.5× usual Gumi, 25 April: 37.6 µg/m³, 2.2× usual Gumi, 26 April: 18.8 µg/m³, 1.1× usual Gumi, 27 April: 17.9 µg/m³, 1.0× usual Gumi, 28 April: 19.0 µg/m³, 1.1× usual Gumi, 29 April: 32.0 µg/m³, 1.9× usual Koesan Koesan, 22 April: 8.9 µg/m³, 0.6× usual Koesan, 23 April: 5.9 µg/m³, 0.4× usual Koesan, 24 April: 17.7 µg/m³, 1.1× usual Koesan, 25 April: 36.9 µg/m³, 2.3× usual Koesan, 26 April: 13.7 µg/m³, 0.9× usual Koesan, 27 April: 7.6 µg/m³, 0.5× usual Koesan, 28 April: 13.3 µg/m³, 0.8× usual Koesan, 29 April: 18.3 µg/m³, 1.1× usual Wŏnju Wŏnju, 22 April: 10.4 µg/m³, 0.6× usual Wŏnju, 23 April: 6.2 µg/m³, 0.4× usual Wŏnju, 24 April: 19.9 µg/m³, 1.2× usual Wŏnju, 25 April: 35.9 µg/m³, 2.1× usual Wŏnju, 26 April: 16.7 µg/m³, 1.0× usual Wŏnju, 27 April: 12.7 µg/m³, 0.7× usual Wŏnju, 28 April: 13.7 µg/m³, 0.8× usual Wŏnju, 29 April: 20.6 µg/m³, 1.2× usual Jungpyong Jungpyong, 22 April: 8.2 µg/m³, 0.5× usual Jungpyong, 23 April: 5.9 µg/m³, 0.4× usual Jungpyong, 24 April: 23.9 µg/m³, 1.6× usual Jungpyong, 25 April: 35.4 µg/m³, 2.4× usual Jungpyong, 26 April: 12.8 µg/m³, 0.9× usual Jungpyong, 27 April: 8.2 µg/m³, 0.5× usual Jungpyong, 28 April: 13.0 µg/m³, 0.9× usual Jungpyong, 29 April: 19.8 µg/m³, 1.3× usual Chuncheon Chuncheon, 22 April: 7.5 µg/m³, 0.7× usual Chuncheon, 23 April: 6.3 µg/m³, 0.5× usual Chuncheon, 24 April: 16.6 µg/m³, 1.4× usual Chuncheon, 25 April: 35.0 µg/m³, 3.0× usual Chuncheon, 26 April: 15.5 µg/m³, 1.3× usual Chuncheon, 27 April: 10.8 µg/m³, 0.9× usual Chuncheon, 28 April: 11.3 µg/m³, 1.0× usual Chuncheon, 29 April: 18.9 µg/m³, 1.6× usual Gwangju Gwangju, 22 April: 10.3 µg/m³, 0.7× usual Gwangju, 23 April: 6.0 µg/m³, 0.4× usual Gwangju, 24 April: 19.3 µg/m³, 1.3× usual Gwangju, 25 April: 34.3 µg/m³, 2.3× usual Gwangju, 26 April: 13.5 µg/m³, 0.9× usual Gwangju, 27 April: 8.3 µg/m³, 0.6× usual Gwangju, 28 April: 12.9 µg/m³, 0.9× usual Gwangju, 29 April: 20.3 µg/m³, 1.4× usual Ōdachō-ōda Ōdachō-ōda, 22 April: 8.0 µg/m³, 0.9× usual Ōdachō-ōda, 23 April: 3.8 µg/m³, 0.4× usual Ōdachō-ōda, 24 April: 7.2 µg/m³, 0.8× usual Ōdachō-ōda, 25 April: 33.9 µg/m³, 3.7× usual Ōdachō-ōda, 26 April: 22.0 µg/m³, 2.4× usual Ōdachō-ōda, 27 April: 10.3 µg/m³, 1.1× usual Ōdachō-ōda, 28 April: 9.9 µg/m³, 1.1× usual Ōdachō-ōda, 29 April: 13.0 µg/m³, 1.4× usual Hwacheon Hwacheon, 22 April: 8.2 µg/m³, 0.7× usual Hwacheon, 23 April: 4.5 µg/m³, 0.4× usual Hwacheon, 24 April: 15.5 µg/m³, 1.4× usual Hwacheon, 25 April: 33.4 µg/m³, 2.9× usual Hwacheon, 26 April: 16.1 µg/m³, 1.4× usual Hwacheon, 27 April: 11.0 µg/m³, 1.0× usual Hwacheon, 28 April: 10.5 µg/m³, 0.9× usual Hwacheon, 29 April: 16.4 µg/m³, 1.4× usual Santyoku Santyoku, 22 April: 10.5 µg/m³, 0.7× usual Santyoku, 23 April: 9.1 µg/m³, 0.6× usual Santyoku, 24 April: 17.5 µg/m³, 1.2× usual Santyoku, 25 April: 33.3 µg/m³, 2.3× usual Santyoku, 26 April: 16.8 µg/m³, 1.1× usual Santyoku, 27 April: 14.1 µg/m³, 1.0× usual Santyoku, 28 April: 18.5 µg/m³, 1.3× usual Santyoku, 29 April: 16.1 µg/m³, 1.1× usual Gapyeong Gapyeong, 22 April: 9.8 µg/m³, 0.7× usual Gapyeong, 23 April: 5.4 µg/m³, 0.4× usual Gapyeong, 24 April: 24.7 µg/m³, 1.8× usual Gapyeong, 25 April: 32.6 µg/m³, 2.4× usual Gapyeong, 26 April: 15.3 µg/m³, 1.1× usual Gapyeong, 27 April: 12.4 µg/m³, 0.9× usual Gapyeong, 28 April: 11.5 µg/m³, 0.9× usual Gapyeong, 29 April: 17.0 µg/m³, 1.3× usual Munsan Munsan, 22 April: 7.1 µg/m³, 0.5× usual Munsan, 23 April: 5.3 µg/m³, 0.4× usual Munsan, 24 April: 25.7 µg/m³, 1.7× usual Munsan, 25 April: 32.4 µg/m³, 2.2× usual Munsan, 26 April: 14.5 µg/m³, 1.0× usual Munsan, 27 April: 10.8 µg/m³, 0.7× usual Munsan, 28 April: 13.8 µg/m³, 0.9× usual Munsan, 29 April: 20.4 µg/m³, 1.4× usual Yeongdong Yeongdong, 22 April: 9.2 µg/m³, 0.6× usual Yeongdong, 23 April: 6.5 µg/m³, 0.5× usual Yeongdong, 24 April: 16.5 µg/m³, 1.2× usual Yeongdong, 25 April: 32.3 µg/m³, 2.3× usual Yeongdong, 26 April: 10.9 µg/m³, 0.8× usual Yeongdong, 27 April: 6.8 µg/m³, 0.5× usual Yeongdong, 28 April: 10.8 µg/m³, 0.8× usual Yeongdong, 29 April: 17.6 µg/m³, 1.2× usual Namyangju Namyangju, 22 April: 9.4 µg/m³, 0.6× usual Namyangju, 23 April: 6.6 µg/m³, 0.4× usual Namyangju, 24 April: 21.5 µg/m³, 1.5× usual Namyangju, 25 April: 32.3 µg/m³, 2.2× usual Namyangju, 26 April: 13.9 µg/m³, 0.9× usual Namyangju, 27 April: 10.7 µg/m³, 0.7× usual Namyangju, 28 April: 13.2 µg/m³, 0.9× usual Namyangju, 29 April: 21.0 µg/m³, 1.4× usual Hamada Hamada, 22 April: 7.6 µg/m³, 0.8× usual Hamada, 23 April: 3.2 µg/m³, 0.4× usual Hamada, 24 April: 6.9 µg/m³, 0.8× usual Hamada, 25 April: 32.0 µg/m³, 3.6× usual Hamada, 26 April: 17.0 µg/m³, 1.9× usual Hamada, 27 April: 9.3 µg/m³, 1.0× usual Hamada, 28 April: 9.7 µg/m³, 1.1× usual Hamada, 29 April: 12.7 µg/m³, 1.4× usual Gōtsuchō Gōtsuchō, 22 April: 6.5 µg/m³, 0.7× usual Gōtsuchō, 23 April: 2.7 µg/m³, 0.3× usual Gōtsuchō, 24 April: 6.3 µg/m³, 0.7× usual Gōtsuchō, 25 April: 31.8 µg/m³, 3.5× usual Gōtsuchō, 26 April: 18.9 µg/m³, 2.1× usual Gōtsuchō, 27 April: 9.4 µg/m³, 1.0× usual Gōtsuchō, 28 April: 8.9 µg/m³, 1.0× usual Gōtsuchō, 29 April: 12.5 µg/m³, 1.4× usual Okcheon Okcheon, 22 April: 7.6 µg/m³, 0.6× usual Okcheon, 23 April: 6.3 µg/m³, 0.5× usual Okcheon, 24 April: 20.4 µg/m³, 1.6× usual Okcheon, 25 April: 31.6 µg/m³, 2.5× usual Okcheon, 26 April: 9.9 µg/m³, 0.8× usual Okcheon, 27 April: 6.9 µg/m³, 0.6× usual Okcheon, 28 April: 10.3 µg/m³, 0.8× usual Okcheon, 29 April: 18.9 µg/m³, 1.5× usual Wabu Wabu, 22 April: 9.4 µg/m³, 0.6× usual Wabu, 23 April: 4.9 µg/m³, 0.3× usual Wabu, 24 April: 18.0 µg/m³, 1.2× usual Wabu, 25 April: 31.2 µg/m³, 2.0× usual Wabu, 26 April: 12.7 µg/m³, 0.8× usual Wabu, 27 April: 10.7 µg/m³, 0.7× usual Wabu, 28 April: 11.4 µg/m³, 0.7× usual Wabu, 29 April: 20.0 µg/m³, 1.3× usual Masuda Masuda, 22 April: 6.8 µg/m³, 0.7× usual Masuda, 23 April: 2.8 µg/m³, 0.3× usual Masuda, 24 April: 6.5 µg/m³, 0.7× usual Masuda, 25 April: 31.0 µg/m³, 3.3× usual Masuda, 26 April: 17.4 µg/m³, 1.8× usual Masuda, 27 April: 8.9 µg/m³, 0.9× usual Masuda, 28 April: 9.6 µg/m³, 1.0× usual Masuda, 29 April: 13.1 µg/m³, 1.4× usual Kurayoshi Kurayoshi, 22 April: 10.3 µg/m³, 0.9× usual Kurayoshi, 23 April: 2.8 µg/m³, 0.3× usual Kurayoshi, 24 April: 4.6 µg/m³, 0.4× usual Kurayoshi, 25 April: 30.8 µg/m³, 2.8× usual Kurayoshi, 26 April: 18.3 µg/m³, 1.7× usual Kurayoshi, 27 April: 12.8 µg/m³, 1.2× usual Kurayoshi, 28 April: 12.6 µg/m³, 1.1× usual Kurayoshi, 29 April: 14.2 µg/m³, 1.3× usual Gion Gion, 22 April: no reading Gion, 23 April: no reading Gion, 24 April: no reading Gion, 25 April: 30.5 µg/m³, 3.3× usual Gion, 26 April: 23.8 µg/m³, 2.6× usual Gion, 27 April: 15.4 µg/m³, 1.7× usual Gion, 28 April: 12.5 µg/m³, 1.4× usual Gion, 29 April: 11.8 µg/m³, 1.3× usual Izumo Izumo, 22 April: 8.6 µg/m³, 0.9× usual Izumo, 23 April: 3.8 µg/m³, 0.4× usual Izumo, 24 April: 6.5 µg/m³, 0.7× usual Izumo, 25 April: 30.5 µg/m³, 3.2× usual Izumo, 26 April: 20.4 µg/m³, 2.1× usual Izumo, 27 April: 9.5 µg/m³, 1.0× usual Izumo, 28 April: 10.0 µg/m³, 1.0× usual Izumo, 29 April: 13.1 µg/m³, 1.4× usual Takahashi Takahashi, 22 April: 11.8 µg/m³, 1.1× usual Takahashi, 23 April: 4.5 µg/m³, 0.4× usual Takahashi, 24 April: 7.0 µg/m³, 0.7× usual Takahashi, 25 April: 30.4 µg/m³, 2.9× usual Takahashi, 26 April: 21.2 µg/m³, 2.0× usual Takahashi, 27 April: 13.5 µg/m³, 1.3× usual Takahashi, 28 April: 14.4 µg/m³, 1.4× usual Takahashi, 29 April: 13.6 µg/m³, 1.3× usual Tsuyama Tsuyama, 22 April: 12.2 µg/m³, 1.2× usual Tsuyama, 23 April: 2.4 µg/m³, 0.2× usual Tsuyama, 24 April: 5.2 µg/m³, 0.5× usual Tsuyama, 25 April: 30.1 µg/m³, 3.0× usual Tsuyama, 26 April: 18.6 µg/m³, 1.8× usual Tsuyama, 27 April: 15.3 µg/m³, 1.5× usual Tsuyama, 28 April: 14.5 µg/m³, 1.4× usual Tsuyama, 29 April: 13.2 µg/m³, 1.3× usual Mungyeong Mungyeong, 22 April: 12.0 µg/m³, 0.9× usual Mungyeong, 23 April: 5.5 µg/m³, 0.4× usual Mungyeong, 24 April: 15.2 µg/m³, 1.2× usual Mungyeong, 25 April: 29.9 µg/m³, 2.3× usual Mungyeong, 26 April: 9.7 µg/m³, 0.7× usual Mungyeong, 27 April: 7.0 µg/m³, 0.5× usual Mungyeong, 28 April: 10.2 µg/m³, 0.8× usual Mungyeong, 29 April: 15.8 µg/m³, 1.2× usual Gangneung Gangneung, 22 April: 13.3 µg/m³, 1.1× usual Gangneung, 23 April: 8.1 µg/m³, 0.7× usual Gangneung, 24 April: 14.4 µg/m³, 1.2× usual Gangneung, 25 April: 29.8 µg/m³, 2.5× usual Gangneung, 26 April: 14.9 µg/m³, 1.2× usual Gangneung, 27 April: 12.7 µg/m³, 1.1× usual Gangneung, 28 April: 15.9 µg/m³, 1.3× usual Gangneung, 29 April: 15.4 µg/m³, 1.3× usual Yecheon Yecheon, 22 April: 11.0 µg/m³, 0.8× usual Yecheon, 23 April: 5.2 µg/m³, 0.4× usual Yecheon, 24 April: 14.6 µg/m³, 1.0× usual Yecheon, 25 April: 29.7 µg/m³, 2.0× usual Yecheon, 26 April: 9.7 µg/m³, 0.7× usual Yecheon, 27 April: 7.0 µg/m³, 0.5× usual Yecheon, 28 April: 10.0 µg/m³, 0.7× usual Yecheon, 29 April: 14.8 µg/m³, 1.0× usual Nantan Nantan, 22 April: 12.3 µg/m³, 1.2× usual Nantan, 23 April: 4.1 µg/m³, 0.4× usual Nantan, 24 April: 4.6 µg/m³, 0.4× usual Nantan, 25 April: 29.5 µg/m³, 2.8× usual Nantan, 26 April: 23.7 µg/m³, 2.3× usual Nantan, 27 April: 19.6 µg/m³, 1.9× usual Nantan, 28 April: 12.5 µg/m³, 1.2× usual Nantan, 29 April: 17.2 µg/m³, 1.7× usual Buyeo Buyeo, 22 April: 10.5 µg/m³, 0.8× usual Buyeo, 23 April: 8.5 µg/m³, 0.7× usual Buyeo, 24 April: 17.1 µg/m³, 1.3× usual Buyeo, 25 April: 29.5 µg/m³, 2.3× usual Buyeo, 26 April: 10.5 µg/m³, 0.8× usual Buyeo, 27 April: 9.4 µg/m³, 0.7× usual Buyeo, 28 April: 11.9 µg/m³, 0.9× usual Buyeo, 29 April: 19.4 µg/m³, 1.5× usual Yasugichō Yasugichō, 22 April: 9.0 µg/m³, 0.9× usual Yasugichō, 23 April: 2.7 µg/m³, 0.3× usual Yasugichō, 24 April: 4.6 µg/m³, 0.5× usual Yasugichō, 25 April: 29.4 µg/m³, 3.0× usual Yasugichō, 26 April: 19.5 µg/m³, 2.0× usual Yasugichō, 27 April: 10.6 µg/m³, 1.1× usual Yasugichō, 28 April: 10.0 µg/m³, 1.0× usual Yasugichō, 29 April: 13.3 µg/m³, 1.3× usual Jumunjin Jumunjin, 22 April: 10.2 µg/m³, 0.8× usual Jumunjin, 23 April: 7.0 µg/m³, 0.5× usual Jumunjin, 24 April: 13.7 µg/m³, 1.1× usual Jumunjin, 25 April: 29.4 µg/m³, 2.3× usual Jumunjin, 26 April: 13.5 µg/m³, 1.0× usual Jumunjin, 27 April: 11.4 µg/m³, 0.9× usual Jumunjin, 28 April: 15.7 µg/m³, 1.2× usual Jumunjin, 29 April: 12.7 µg/m³, 1.0× usual Toyooka Toyooka, 22 April: 10.2 µg/m³, 1.1× usual Toyooka, 23 April: 2.3 µg/m³, 0.2× usual Toyooka, 24 April: 3.8 µg/m³, 0.4× usual Toyooka, 25 April: 29.3 µg/m³, 3.1× usual Toyooka, 26 April: 21.2 µg/m³, 2.2× usual Toyooka, 27 April: 15.7 µg/m³, 1.7× usual Toyooka, 28 April: 12.0 µg/m³, 1.3× usual Toyooka, 29 April: 16.9 µg/m³, 1.8× usual Onomichi Onomichi, 22 April: no reading Onomichi, 23 April: no reading Onomichi, 24 April: no reading Onomichi, 25 April: 25.3 µg/m³, 2.1× usual Onomichi, 26 April: 29.3 µg/m³, 2.4× usual Onomichi, 27 April: 18.5 µg/m³, 1.5× usual Onomichi, 28 April: 13.1 µg/m³, 1.1× usual Onomichi, 29 April: 13.6 µg/m³, 1.1× usual Miyoshi Miyoshi, 22 April: no reading Miyoshi, 23 April: no reading Miyoshi, 24 April: no reading Miyoshi, 25 April: 29.2 µg/m³, 3.3× usual Miyoshi, 26 April: 22.5 µg/m³, 2.5× usual Miyoshi, 27 April: 12.5 µg/m³, 1.4× usual Miyoshi, 28 April: 10.8 µg/m³, 1.2× usual Miyoshi, 29 April: 10.9 µg/m³, 1.2× usual Yae Yae, 22 April: no reading Yae, 23 April: no reading Yae, 24 April: no reading Yae, 25 April: 29.1 µg/m³, 3.5× usual Yae, 26 April: 18.8 µg/m³, 2.3× usual Yae, 27 April: 14.7 µg/m³, 1.8× usual Yae, 28 April: 10.9 µg/m³, 1.3× usual Yae, 29 April: 11.3 µg/m³, 1.4× usual Cheongsong gun Cheongsong gun, 22 April: 11.2 µg/m³, 1.0× usual Cheongsong gun, 23 April: 5.8 µg/m³, 0.5× usual Cheongsong gun, 24 April: 12.8 µg/m³, 1.1× usual Cheongsong gun, 25 April: 29.1 µg/m³, 2.5× usual Cheongsong gun, 26 April: 12.2 µg/m³, 1.1× usual Cheongsong gun, 27 April: 8.4 µg/m³, 0.7× usual Cheongsong gun, 28 April: 11.4 µg/m³, 1.0× usual Cheongsong gun, 29 April: 13.6 µg/m³, 1.2× usual Matsue Matsue, 22 April: 8.6 µg/m³, 0.9× usual Matsue, 23 April: 2.8 µg/m³, 0.3× usual Matsue, 24 April: 5.1 µg/m³, 0.6× usual Matsue, 25 April: 28.9 µg/m³, 3.2× usual Matsue, 26 April: 19.3 µg/m³, 2.1× usual Matsue, 27 April: 7.0 µg/m³, 0.8× usual Matsue, 28 April: 9.6 µg/m³, 1.1× usual Matsue, 29 April: 12.2 µg/m³, 1.3× usual Tottori-shi Tottori-shi, 22 April: 12.0 µg/m³, 1.1× usual Tottori-shi, 23 April: 3.8 µg/m³, 0.4× usual Tottori-shi, 24 April: 5.2 µg/m³, 0.5× usual Tottori-shi, 25 April: 28.8 µg/m³, 2.7× usual Tottori-shi, 26 April: 23.4 µg/m³, 2.2× usual Tottori-shi, 27 April: 11.5 µg/m³, 1.1× usual Tottori-shi, 28 April: 13.6 µg/m³, 1.3× usual Tottori-shi, 29 April: 14.2 µg/m³, 1.3× usual Nagato Nagato, 22 April: 7.1 µg/m³, 0.7× usual Nagato, 23 April: 3.5 µg/m³, 0.4× usual Nagato, 24 April: 8.0 µg/m³, 0.8× usual Nagato, 25 April: 28.7 µg/m³, 3.0× usual Nagato, 26 April: 15.1 µg/m³, 1.6× usual Nagato, 27 April: 14.1 µg/m³, 1.5× usual Nagato, 28 April: 9.7 µg/m³, 1.0× usual Nagato, 29 April: 12.7 µg/m³, 1.3× usual Higashihiroshima Higashihiroshima, 22 April: no reading Higashihiroshima, 23 April: no reading Higashihiroshima, 24 April: no reading Higashihiroshima, 25 April: 28.7 µg/m³, 2.6× usual Higashihiroshima, 26 April: 23.5 µg/m³, 2.1× usual Higashihiroshima, 27 April: 15.9 µg/m³, 1.4× usual Higashihiroshima, 28 April: 11.3 µg/m³, 1.0× usual Higashihiroshima, 29 April: 12.8 µg/m³, 1.2× usual Yonago Yonago, 22 April: 9.7 µg/m³, 1.0× usual Yonago, 23 April: 2.9 µg/m³, 0.3× usual Yonago, 24 April: 4.6 µg/m³, 0.5× usual Yonago, 25 April: 28.6 µg/m³, 2.9× usual Yonago, 26 April: 20.7 µg/m³, 2.1× usual Yonago, 27 April: 10.1 µg/m³, 1.0× usual Yonago, 28 April: 11.0 µg/m³, 1.1× usual Yonago, 29 April: 12.4 µg/m³, 1.3× usual Kunwi Kunwi, 22 April: 10.5 µg/m³, 0.8× usual Kunwi, 23 April: 6.9 µg/m³, 0.5× usual Kunwi, 24 April: 13.8 µg/m³, 1.1× usual Kunwi, 25 April: 28.5 µg/m³, 2.2× usual Kunwi, 26 April: 10.1 µg/m³, 0.8× usual Kunwi, 27 April: 7.3 µg/m³, 0.6× usual Kunwi, 28 April: 9.8 µg/m³, 0.7× usual Kunwi, 29 April: 15.5 µg/m³, 1.2× usual Kosong Kosong, 22 April: 5.6 µg/m³, 0.6× usual Kosong, 23 April: 3.1 µg/m³, 0.3× usual Kosong, 24 April: 12.9 µg/m³, 1.4× usual Kosong, 25 April: 28.3 µg/m³, 3.1× usual Kosong, 26 April: 12.2 µg/m³, 1.4× usual Kosong, 27 April: 10.3 µg/m³, 1.1× usual Kosong, 28 April: 11.4 µg/m³, 1.3× usual Kosong, 29 April: 12.0 µg/m³, 1.3× usual Sakaiminato Sakaiminato, 22 April: 8.5 µg/m³, 0.9× usual Sakaiminato, 23 April: 2.4 µg/m³, 0.3× usual Sakaiminato, 24 April: 3.8 µg/m³, 0.4× usual Sakaiminato, 25 April: 28.0 µg/m³, 3.1× usual Sakaiminato, 26 April: 20.3 µg/m³, 2.2× usual Sakaiminato, 27 April: 9.4 µg/m³, 1.0× usual Sakaiminato, 28 April: 8.7 µg/m³, 1.0× usual Sakaiminato, 29 April: 11.5 µg/m³, 1.3× usual Bizen Bizen, 22 April: 14.7 µg/m³, 1.3× usual Bizen, 23 April: 5.0 µg/m³, 0.4× usual Bizen, 24 April: 5.6 µg/m³, 0.5× usual Bizen, 25 April: 28.0 µg/m³, 2.5× usual Bizen, 26 April: 20.5 µg/m³, 1.8× usual Bizen, 27 April: 17.1 µg/m³, 1.5× usual Bizen, 28 April: 15.1 µg/m³, 1.3× usual Bizen, 29 April: 13.5 µg/m³, 1.2× usual Unnan Unnan, 22 April: 8.7 µg/m³, 0.9× usual Unnan, 23 April: 2.7 µg/m³, 0.3× usual Unnan, 24 April: 6.0 µg/m³, 0.6× usual Unnan, 25 April: 27.8 µg/m³, 2.9× usual Unnan, 26 April: 19.3 µg/m³, 2.0× usual Unnan, 27 April: 10.0 µg/m³, 1.1× usual Unnan, 28 April: 9.7 µg/m³, 1.0× usual Unnan, 29 April: 12.5 µg/m³, 1.3× usual Hiroshima Hiroshima, 22 April: no reading Hiroshima, 23 April: no reading Hiroshima, 24 April: no reading Hiroshima, 25 April: 27.4 µg/m³, 2.6× usual Hiroshima, 26 April: 23.8 µg/m³, 2.3× usual Hiroshima, 27 April: 15.0 µg/m³, 1.4× usual Hiroshima, 28 April: 12.1 µg/m³, 1.2× usual Hiroshima, 29 April: 10.8 µg/m³, 1.0× usual Kariya Kariya, 22 April: 12.5 µg/m³, 1.3× usual Kariya, 23 April: 8.2 µg/m³, 0.9× usual Kariya, 24 April: 5.1 µg/m³, 0.5× usual Kariya, 25 April: 26.4 µg/m³, 2.8× usual Kariya, 26 April: 27.2 µg/m³, 2.8× usual Kariya, 27 April: 15.8 µg/m³, 1.6× usual Kariya, 28 April: 14.2 µg/m³, 1.5× usual Kariya, 29 April: 13.4 µg/m³, 1.4× usual Miyazu Miyazu, 22 April: 9.6 µg/m³, 1.1× usual Miyazu, 23 April: 1.4 µg/m³, 0.2× usual Miyazu, 24 April: 2.9 µg/m³, 0.3× usual Miyazu, 25 April: 27.1 µg/m³, 3.0× usual Miyazu, 26 April: 20.2 µg/m³, 2.2× usual Miyazu, 27 April: 14.5 µg/m³, 1.6× usual Miyazu, 28 April: 12.4 µg/m³, 1.4× usual Miyazu, 29 April: 14.3 µg/m³, 1.6× usual Ayabe Ayabe, 22 April: 11.7 µg/m³, 1.2× usual Ayabe, 23 April: 2.7 µg/m³, 0.3× usual Ayabe, 24 April: 3.6 µg/m³, 0.4× usual Ayabe, 25 April: 27.0 µg/m³, 2.8× usual Ayabe, 26 April: 19.1 µg/m³, 1.9× usual Ayabe, 27 April: 17.0 µg/m³, 1.7× usual Ayabe, 28 April: 11.2 µg/m³, 1.1× usual Ayabe, 29 April: 17.9 µg/m³, 1.8× usual Neietsu Neietsu, 22 April: 7.9 µg/m³, 0.7× usual Neietsu, 23 April: 4.7 µg/m³, 0.4× usual Neietsu, 24 April: 13.7 µg/m³, 1.2× usual Neietsu, 25 April: 27.0 µg/m³, 2.3× usual Neietsu, 26 April: 13.5 µg/m³, 1.2× usual Neietsu, 27 April: 10.4 µg/m³, 0.9× usual Neietsu, 28 April: 11.0 µg/m³, 1.0× usual Neietsu, 29 April: 13.5 µg/m³, 1.2× usual Anan Anan, 22 April: 12.1 µg/m³, 1.3× usual Anan, 23 April: 11.7 µg/m³, 1.2× usual Anan, 24 April: 5.7 µg/m³, 0.6× usual Anan, 25 April: 23.0 µg/m³, 2.4× usual Anan, 26 April: 31.2 µg/m³, 3.3× usual Anan, 27 April: 15.1 µg/m³, 1.6× usual Anan, 28 April: 20.9 µg/m³, 2.2× usual Anan, 29 April: 13.7 µg/m³, 1.4× usual Kurashiki Kurashiki, 22 April: 12.3 µg/m³, 1.0× usual Kurashiki, 23 April: 17.3 µg/m³, 1.5× usual Kurashiki, 24 April: 9.2 µg/m³, 0.8× usual Kurashiki, 25 April: 24.9 µg/m³, 2.1× usual Kurashiki, 26 April: 29.5 µg/m³, 2.5× usual Kurashiki, 27 April: 19.7 µg/m³, 1.7× usual Kurashiki, 28 April: 15.6 µg/m³, 1.3× usual Kurashiki, 29 April: 11.8 µg/m³, 1.0× usual Higashinozoe Higashinozoe, 22 April: 11.7 µg/m³, 1.1× usual Higashinozoe, 23 April: 9.4 µg/m³, 0.9× usual Higashinozoe, 24 April: 4.2 µg/m³, 0.4× usual Higashinozoe, 25 April: 22.2 µg/m³, 2.1× usual Higashinozoe, 26 April: 28.4 µg/m³, 2.7× usual Higashinozoe, 27 April: 19.4 µg/m³, 1.9× usual Higashinozoe, 28 April: 13.2 µg/m³, 1.3× usual Higashinozoe, 29 April: 13.0 µg/m³, 1.3× usual Tamano Tamano, 22 April: 12.8 µg/m³, 1.1× usual Tamano, 23 April: 10.5 µg/m³, 0.9× usual Tamano, 24 April: 5.8 µg/m³, 0.5× usual Tamano, 25 April: 24.0 µg/m³, 2.1× usual Tamano, 26 April: 28.2 µg/m³, 2.4× usual Tamano, 27 April: 18.8 µg/m³, 1.6× usual Tamano, 28 April: 17.6 µg/m³, 1.5× usual Tamano, 29 April: 11.3 µg/m³, 1.0× usual Arida Arida, 22 April: 11.9 µg/m³, 1.2× usual Arida, 23 April: 8.2 µg/m³, 0.8× usual Arida, 24 April: 6.5 µg/m³, 0.6× usual Arida, 25 April: 21.8 µg/m³, 2.1× usual Arida, 26 April: 27.1 µg/m³, 2.7× usual Arida, 27 April: 18.9 µg/m³, 1.9× usual Arida, 28 April: 11.2 µg/m³, 1.1× usual Arida, 29 April: 14.5 µg/m³, 1.4× usual 22 Apr 23 24 25 26 27 28 29 The 60 cities with the highest readings of 86, 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
Ōdachō-ōda Shimane, Japan 1 25 April 9.2 3.7× Hamada Shimane, Japan 1 25 April 9.0 3.6× Yae Hiroshima, Japan 1 25 April 8.3 3.5× Gōtsuchō Shimane, Japan 1 25 April 9.1 3.5× Gion Hiroshima, Japan 1 25 April 9.2 3.3× Miyoshi Hiroshima, Japan 1 25 April 8.9 3.3× Masuda Shimane, Japan 1 25 April 9.5 3.3× Anan Tokushima, Japan 1 26 April 9.6 3.3× Niimi Okayama, Japan 1 25 April 8.1 3.2× Izumo Shimane, Japan 1 25 April 9.6 3.2× Matsue Shimane, Japan 1 25 April 9.1 3.2× Yanggu Gangwon-do, South Korea 1 25 April 12.0 3.2× Kosong Gangwon-do, South Korea 1 25 April 9.0 3.1× Toyooka Hyōgo, Japan 1 25 April 9.5 3.1× Sakaiminato Tottori, Japan 1 25 April 9.1 3.1× Chuncheon Gangwon-do, South Korea 1 25 April 11.5 3.0× Hagi Yamaguchi, Japan 1 25 April 8.6 3.0× Nagato Yamaguchi, Japan 1 25 April 9.6 3.0× Miyazu Kyoto, Japan 1 25 April 9.1 3.0× Yasugichō Shimane, Japan 1 25 April 9.9 3.0× Tsuyama Okayama, Japan 1 25 April 10.2 3.0× Yonago Tottori, Japan 1 25 April 9.7 2.9× Hwacheon Gangwon-do, South Korea 1 25 April 11.4 2.9× Unnan Shimane, Japan 1 25 April 9.5 2.9× Takahashi Okayama, Japan 1 25 April 10.4 2.9× Nantan Kyoto, Japan 1 25 April 10.4 2.8× Kōtari Kyoto, Japan 1 25 April 9.1 2.8× Kariya Hyōgo, Japan 2 26 April 9.6 2.8× Yangp'yŏng Gyeonggi-do, South Korea 1 25 April 16.0 2.8× Kurayoshi Tottori, Japan 1 25 April 11.0 2.8× Maizuru Kyoto, Japan 1 25 April 9.1 2.8× Aioi Hyōgo, Japan 2 26 April 9.5 2.8× Hongch’ŏn Gangwon-do, South Korea 1 25 April 14.1 2.8× Ayabe Kyoto, Japan 1 25 April 9.8 2.8× Higashinozoe Hyōgo, Japan 1 26 April 10.4 2.7× Tottori-shi Tottori, Japan 1 25 April 10.6 2.7× Sandachō Hyōgo, Japan 1 25 April 9.8 2.7× Tatsuno Hyōgo, Japan 1 25 April 9.6 2.7× Fukuchiyama Kyoto, Japan 1 25 April 9.8 2.7× Mine Yamaguchi, Japan 1 25 April 9.7 2.7× Arida Wakayama, Japan 1 26 April 10.2 2.7× Akashi Hyōgo, Japan 1 26 April 10.1 2.7× Okayama Okayama, Japan 2 26 April 9.9 2.6× Hiroshima Hiroshima, Japan 1 25 April 10.5 2.6× Higashihiroshima Hiroshima, Japan 1 25 April 11.0 2.6× Narutochō-mitsuishi Tokushima, Japan 1 26 April 9.6 2.6× Matsusaka Mie, Japan 1 25 April 10.0 2.6× Chungju North Chungcheong, South Korea 1 25 April 15.2 2.5× Takamatsu Kagawa, Japan 1 26 April 10.2 2.5× Okcheon North Chungcheong, South Korea 1 25 April 12.5 2.5× Cheongsong gun Gyeongsangbuk-do, South Korea 1 25 April 11.6 2.5× Kurashiki Okayama, Japan 1 26 April 11.8 2.5× Gangneung Gangwon-do, South Korea 1 25 April 12.0 2.5× Bizen Okayama, Japan 1 25 April 11.4 2.5× Kakogawachō-honmachi Hyōgo, Japan 1 26 April 10.9 2.4× Tamano Okayama, Japan 1 26 April 11.6 2.4× Higashiosaka Osaka, Japan 1 26 April 10.8 2.4× Onomichi Hiroshima, Japan 2 26 April 12.1 2.4× Gapyeong Gyeonggi-do, South Korea 1 25 April 13.5 2.4× Sōja Okayama, Japan 1 26 April 11.1 2.4× Jungpyong North Chungcheong, South Korea 1 25 April 15.0 2.4× Neietsu Gangwon-do, South Korea 1 25 April 11.5 2.3× Kure Hiroshima, Japan 1 25 April 10.9 2.3× Amagasaki Hyōgo, Japan 1 26 April 10.9 2.3× Gwangju Gyeonggi-do, South Korea 1 25 April 14.9 2.3× Koesan North Chungcheong, South Korea 1 25 April 16.1 2.3× Mungyeong Gyeongsangbuk-do, South Korea 1 25 April 13.1 2.3× Jumunjin Gangwon-do, South Korea 1 25 April 12.9 2.3× Kinzan Chungcheongnam-do, South Korea 1 25 April 16.6 2.3× Buyeo Chungcheongnam-do, South Korea 1 25 April 13.0 2.3× Santyoku Gangwon-do, South Korea 1 25 April 14.7 2.3× Yeongdong North Chungcheong, South Korea 1 25 April 14.3 2.3× Onoda Yamaguchi, Japan 1 25 April 12.0 2.2× Nakatsu Oita, Japan 1 25 April 11.6 2.2× Asakuchi Okayama, Japan 1 26 April 12.1 2.2× Gumi Gyeongsangbuk-do, South Korea 1 25 April 17.1 2.2× Yawata Kyoto, Japan 1 25 April 11.6 2.2× Munsan Gyeonggi-do, South Korea 1 25 April 14.8 2.2× Namyangju Gyeonggi-do, South Korea 1 25 April 14.8 2.2× Kunwi Gyeongsangbuk-do, South Korea 1 25 April 13.1 2.2× Gyeongju Gyeongsangbuk-do, South Korea 1 25 April 12.5 2.1× Wŏnju Gangwon-do, South Korea 1 25 April 17.1 2.1× Kasaoka Okayama, Japan 1 26 April 12.4 2.1× Yeosu Jeollanam-do, South Korea 1 25 April 12.3 2.0× Yecheon Gyeongsangbuk-do, South Korea 1 25 April 14.5 2.0× Wabu Gyeonggi-do, South Korea 1 25 April 15.3 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 Japan and South Korea
Number 23 of 63 episodes in Japan and South Korea since our records began, by cities reached.
Japan, June and July 2025 508 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 Japan, July 2026 172 South Korea and Japan, January 2026 169 South Korea and Japan, February 2026 147 South Korea, February 2025 132 Japan, November 2023 131 South Korea, November 2025 128 Japan, August 2025 126 Japan and South Korea, April 2025 86 Bars: cities reached; colour: the level of the episode's highest daily reading. All 63 .
Use this page SmogRank, Japan and South Korea, April 2025: 86 cities with PM2.5 at twice their usual or more, 25 to 26 April 2025, smogrank.com/episodes/2025-04-japan-and-south-korea (accessed 2 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.
