SmogRank / Episodes / Japan
Japan and South Korea, September 2024
For 6 days, from 3 to 8 September 2024, 49 cities in Japan and South Korea had PM2.5 at least twice their usual for the time of year. The worst reading was Hondomachi-hondo, Kumamoto, Japan: 37.3 µg/m³ on 6 September, about 4.4× its usual 8.4.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 49 in 2 countries
Days 6 3 to 8 September 2024
Worst day 6 September 27 cities counted
Furthest above usual 4.9× Nichinan
Day by day
Play 6 September 27 cities at twice their usual or more
Marugame Zentsujichó Takinomiya Kan’onjichō Ikedachō Tamano Takamatsu Kurashiki Asakuchi Hiragi Sōja Okayama Shikokuchūō Shido Mima Fukuyama Takahashi Shin’ichi Niihama Onomichi Yoshinogawa Kamojimachō-jōgejima Bizen Mihara Saijō Nankoku Niimi Kariya Kochi Tsuyama Imabari Aki Ino Tokushima Narutochō-mitsuishi Takehara Aioi Tatsuno Anan Ikaruga Shinagawa Susaki Higashihiroshima Miyoshi Himeji Matsuyama Sumoto Kakogawachō-honmachi Higashinozoe Iyo Kure Yonago Yasugichō Unnan Akashi Ono Tottori-shi Yae Gion Hiroshima Sakaiminato Arida Minato Nishiwaki Matsue Kainan Gobō Izumo Kobe Sennan Tanba Ōdachō-ōda Iwade Ōtake Izumisano Iwakuni Nakamura Yawatahama Kishiwada Uwajima Nishinomiya Toyooka Kinokawa Takarazuka Izumi Fukuchiyama Yanai Tanabe Gōtsuchō Amagasaki Sakai Toyonaka Osaka Hamada Ayabe Sayama Kawachi-Nagano Kyōtango Yono Habikino Tondabayashichō Hashimoto Higashiosaka Hikari Yao Miyazu Nantan Kudamatsu Takatsuki Maizuru Kameoka Hirakata Masuda Shūnan Ikoma Hōryūji Kashiwara Yawata Kōtari Kashihara-shi Nara-shi Sugai Tenri Jōyō Kyoto Kizugawa Uji Kunisaki Ōtsu Hōfu Tsukumiura Shingū Usuki Yamaguchi Obama Kusatsu Kitahama Tsurusaki Nabari Hagi Kumano Ueno-ebisumachi Iga Owase Ōmihachiman Kōka Beppu Takashima Ube Mine Mie Youkaichi Nagato Onoda Hikone Tsuruga Nagahama Kameyama Tsu Matsusaka Kanda Yukuhashi Shimonoseki Saikū Suzuka Inabe Sabae Yokkaichi Ise Kitakyushu Hita Kuwana Kaizu Aso Fukui-shi Ōgaki Ibi Tagawa Mikuni Shima Toba Hashima Nōgata Nakama Mizuho Koga Tokoname Kaminoma Iizuka Ama Ichinomiya Gifu Ono Handa Tōkai Munakata Kaga Minamichita Nagoya Hekinan Kariya Kakamigahara Yame Wakasugi Nishio Chiryū Ogōri Koga Inuyama Sekimachi Anjō Tosu Owariasahi Nisshin Kasuga Komatsu Fukuoka Okazaki Seto Minokamo Kani Toyota Gamagōri Tajimi Tahara Kanzakimachi-kanzaki Yanagawa Matsutō Toki Nonoichi Kobayashi Saga Toyohashi Kanazawa Itoshima Hitoyoshi Kosai Gero Shinshiro Higashigō Taku Tsubata Kashima Oyabe Karatsu Takeo Tonami Takayama Kirishima Ureshinomachi-shimojuku Hakui Hamamatsu Imarichō-kō Hamakita Izumi Takaoka Iki Iwata Himimachi Kanoya Imizu Fukuroi Toyama Nanao Kagoshima Iida Sendai Kakegawa Kushikino Namerikawa Kikugawa Uozu Minamikyushu Shimada Ina Tsushima Kaseda-shirakame Fujieda Nyūzen Ulsan Matsumoto Okaya Gijang Shizuoka Suwa Ungsang Pohang Yeonil Busan Gyeongju Yangsan Chikuma Minami-Alps Itoigawa Fujinomiya Kimhae Ueda Kofu Fuji Nagano Saku Geoje Eisen Suzaka Fujiyoshida Numazu Miryang Changwon Cheongsong gun Sinhyeon Shimoda Hayang Susono Izunokuni Gyeongsan-si Gotemba Jōetsu Atami Daegu Changnyeong Minamiashigara Odawara Hwawŏn Goseong Tomioka Andong Kunwi Hadano Nakanojō Santyoku Chichibu T’aebaek Waegwan Hiratsuka Shibukawa Ōme Minawa Kodamachō-kodamaminami Aihara Atsugi Hachiōji Yorii Yeongju Gumi Chigasaki Ebina Chinju Honjō Hannō Ayase Ogawamachi Morohongō Numata Akishima Minamirinkan Yokota Iruma Yamato Fujisawa Yecheon Minamiuonuma Machida Sayama Sakado Kamakura Fuchū Higashimurayama Kodaira Tokorozawa Higashi-Matsuyama Miura Kumagaya Azamino Higashikurume Menuma Igusa Gimcheon Kawagoe Noborito Ōta Kiryū Yokosuka Gyōda Niiza Yokohama Sangju Kurihama Kōnosu Asaka Mungyeong Ashikaga Neietsu Hanyū Hadong Ageo Tokyo Tatebayashi Saitama Gwangyang Kazo Yeosu Kawaguchi Tateyama Sano Kukichūō Kimitsu Minamibōsō Kasukabe Kwangyang Sōka Koshigaya Koga Kisarazu Yeongdong Urayasu Misato, Saitama Matsudo Suncheon Tochigi Noda Bandō Sodegaura Oyama Kurye Kanuma Imaichi Changsu Kashiwa Kamagaya Narashino Chungju Ichihara Jōsō Beolgyo Shimo-tsuma Chiba Nangen Koesan Kaminokawa Toride Yachiyo Okcheon Jinan-gun Utsunomiya Chikusei Kinzan Yotsukaidō Wŏnju Inzai Katsuura Mooka Sakura Imsil Mobara Naka Ajiki Yaita Ōami Jungpyong Yachimata Tsuchiura Ōhara Cheongju-si Daejeon Boseong Narita Tōgane Inashiki Ishioka Jeonju Wanju Nasukarasuyama Kasama Chinch'ŏn Hwasun Yeoju Nasushiobara Damyang Sejong Jangheung Gwangju Sawara Namsa Yŏnmu Sōsa Pubal Nonsan Jeongeup Gongju Masan Icheon-si Hokota Hitachiomiya Iksan Omigawa Anseong Kimje Jangseong Kashima-shi Cheonan Shirakawa Kamisu Hitachi-Naka Naju Yeongam Seonghwan Buyeo Koch'ang Haenam Buan Asan Choshi Gwangju Gunsan Hitachi Osan Seogwipo Jeju City Kōriyama Muan Yeonggwang Yesan Seongnam-si Suwon Mokpo Kitaibaraki Boryeong Hongseong Gaigeturi Anyang-si Hwaseong-si Ansan-si Tangjin Iwaki Sinan Seosan Taesal-li Takasaki Ōtsuki Pyeongtaek Yufu Sandachō Tongyeong Kasaoka Yamaga Kurume Nakatsu Naesŏ Ukiha Chikugo Tamana Sasebo Mifune Mito Yamanashi Ōzu Honmachi Togitsu Maebaru-chūō Kikuchi Uekimachi-mōno Buzen Matsuura Nobeoka Uto Ōmura Hyūga Kotō Ōmuta Takanabe Ōita Minamata Isahaya Shintomi Gotō Obita Nagasaki Kumamoto Arao Saikai Saiki Hondomachi-hondo Miyakonojō Ōyanomachi-noboritate Miyazaki Nichinan 31 Aug 1 Sep 2 3 4 5 6 7 8 9 10 11 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
Saiki Saiki, 31 August: 10.2 µg/m³ Saiki, 1 September: 10.3 µg/m³ Saiki, 2 September: 20.7 µg/m³ Saiki, 3 September: 29.1 µg/m³, 4.3× its usual 6.8 Saiki, 4 September: 24.1 µg/m³ Saiki, 5 September: 15.5 µg/m³ Saiki, 6 September: 12.8 µg/m³ Saiki, 7 September: 11.2 µg/m³ Saiki, 8 September: 15.4 µg/m³ Saiki, 9 September: 17.1 µg/m³ Saiki, 10 September: 5.9 µg/m³ Saiki, 11 September: 5.4 µg/m³ Nobeoka Nobeoka, 31 August: 8.1 µg/m³ Nobeoka, 1 September: 9.9 µg/m³ Nobeoka, 2 September: 18.1 µg/m³ Nobeoka, 3 September: 27.6 µg/m³, 3.7× its usual 7.5 Nobeoka, 4 September: 23.4 µg/m³ Nobeoka, 5 September: 14.1 µg/m³ Nobeoka, 6 September: 10.2 µg/m³ Nobeoka, 7 September: 10.1 µg/m³ Nobeoka, 8 September: 12.0 µg/m³ Nobeoka, 9 September: 13.7 µg/m³ Nobeoka, 10 September: 3.8 µg/m³ Nobeoka, 11 September: 3.8 µg/m³ Hyūga Hyūga, 31 August: 7.7 µg/m³ Hyūga, 1 September: 10.9 µg/m³ Hyūga, 2 September: 16.7 µg/m³ Hyūga, 3 September: 26.1 µg/m³, 3.8× its usual 6.9 Hyūga, 4 September: 24.8 µg/m³ Hyūga, 5 September: 13.2 µg/m³ Hyūga, 6 September: no reading Hyūga, 7 September: no reading Hyūga, 8 September: no reading Hyūga, 9 September: no reading Hyūga, 10 September: no reading Hyūga, 11 September: no reading Takanabe Takanabe, 31 August: no reading Takanabe, 1 September: 12.1 µg/m³ Takanabe, 2 September: 19.5 µg/m³ Takanabe, 3 September: 26.0 µg/m³, 3.9× its usual 6.7 Takanabe, 4 September: 25.6 µg/m³, 3.8× its usual 6.7 Takanabe, 5 September: 12.3 µg/m³ Takanabe, 6 September: 8.5 µg/m³ Takanabe, 7 September: 7.7 µg/m³ Takanabe, 8 September: 8.5 µg/m³ Takanabe, 9 September: 12.9 µg/m³ Takanabe, 10 September: 3.8 µg/m³ Takanabe, 11 September: 3.9 µg/m³ Minamata Minamata, 31 August: 10.2 µg/m³ Minamata, 1 September: 14.3 µg/m³ Minamata, 2 September: 12.5 µg/m³ Minamata, 3 September: 12.9 µg/m³ Minamata, 4 September: 31.6 µg/m³, 3.8× its usual 8.3 Minamata, 5 September: 31.9 µg/m³, 3.9× its usual 8.2 Minamata, 6 September: 29.5 µg/m³, 3.6× its usual 8.2 Minamata, 7 September: 29.9 µg/m³, 3.6× its usual 8.2 Minamata, 8 September: 26.4 µg/m³, 3.2× its usual 8.2 Minamata, 9 September: 16.1 µg/m³ Minamata, 10 September: 3.4 µg/m³ Minamata, 11 September: 5.6 µg/m³ Honmachi Honmachi, 31 August: 8.5 µg/m³ Honmachi, 1 September: 14.3 µg/m³ Honmachi, 2 September: 14.0 µg/m³ Honmachi, 3 September: 17.8 µg/m³ Honmachi, 4 September: 29.4 µg/m³, 3.3× its usual 8.8 Honmachi, 5 September: 30.6 µg/m³, 3.5× its usual 8.8 Honmachi, 6 September: 27.9 µg/m³, 3.2× its usual 8.8 Honmachi, 7 September: 29.9 µg/m³, 3.4× its usual 8.7 Honmachi, 8 September: 29.7 µg/m³, 3.4× its usual 8.7 Honmachi, 9 September: 21.7 µg/m³ Honmachi, 10 September: 7.1 µg/m³ Honmachi, 11 September: 5.9 µg/m³ Miyakonojō Miyakonojō, 31 August: 8.6 µg/m³ Miyakonojō, 1 September: 13.3 µg/m³ Miyakonojō, 2 September: 18.9 µg/m³ Miyakonojō, 3 September: 20.6 µg/m³ Miyakonojō, 4 September: 29.0 µg/m³, 4.5× its usual 6.4 Miyakonojō, 5 September: 15.2 µg/m³ Miyakonojō, 6 September: 10.7 µg/m³ Miyakonojō, 7 September: 8.2 µg/m³ Miyakonojō, 8 September: 7.0 µg/m³ Miyakonojō, 9 September: 9.9 µg/m³ Miyakonojō, 10 September: 2.8 µg/m³ Miyakonojō, 11 September: 3.8 µg/m³ Uto Uto, 31 August: 9.5 µg/m³ Uto, 1 September: 12.6 µg/m³ Uto, 2 September: 13.0 µg/m³ Uto, 3 September: 16.9 µg/m³ Uto, 4 September: 28.2 µg/m³, 3.5× its usual 8.1 Uto, 5 September: 24.6 µg/m³ Uto, 6 September: 29.4 µg/m³, 3.7× its usual 7.9 Uto, 7 September: 26.5 µg/m³, 3.4× its usual 7.9 Uto, 8 September: 25.4 µg/m³, 3.2× its usual 7.9 Uto, 9 September: 13.2 µg/m³ Uto, 10 September: 5.5 µg/m³ Uto, 11 September: 5.9 µg/m³ Nichinan Nichinan, 31 August: no reading Nichinan, 1 September: 9.6 µg/m³ Nichinan, 2 September: 15.8 µg/m³ Nichinan, 3 September: 18.6 µg/m³ Nichinan, 4 September: 27.6 µg/m³, 4.9× its usual 5.6 Nichinan, 5 September: 11.9 µg/m³ Nichinan, 6 September: 7.6 µg/m³ Nichinan, 7 September: 6.3 µg/m³ Nichinan, 8 September: 4.8 µg/m³ Nichinan, 9 September: 8.2 µg/m³ Nichinan, 10 September: 4.1 µg/m³ Nichinan, 11 September: 4.0 µg/m³ Ōyanomachi-noborita… Ōyanomachi-noboritate, 31 August: 8.8 µg/m³ Ōyanomachi-noboritate, 1 September: 12.8 µg/m³ Ōyanomachi-noboritate, 2 September: 10.6 µg/m³ Ōyanomachi-noboritate, 3 September: 15.7 µg/m³ Ōyanomachi-noboritate, 4 September: 26.8 µg/m³, 3.4× its usual 7.8 Ōyanomachi-noboritate, 5 September: 31.5 µg/m³, 4.1× its usual 7.7 Ōyanomachi-noboritate, 6 September: 34.5 µg/m³, 4.6× its usual 7.5 Ōyanomachi-noboritate, 7 September: 31.3 µg/m³, 4.2× its usual 7.4 Ōyanomachi-noboritate, 8 September: 30.5 µg/m³, 4.1× its usual 7.4 Ōyanomachi-noboritate, 9 September: 21.5 µg/m³ Ōyanomachi-noboritate, 10 September: 5.2 µg/m³ Ōyanomachi-noboritate, 11 September: 5.5 µg/m³ Miyazaki Miyazaki, 31 August: 6.2 µg/m³ Miyazaki, 1 September: 9.1 µg/m³ Miyazaki, 2 September: 15.9 µg/m³ Miyazaki, 3 September: 20.6 µg/m³ Miyazaki, 4 September: 26.6 µg/m³, 4.9× its usual 5.4 Miyazaki, 5 September: 13.5 µg/m³ Miyazaki, 6 September: 7.8 µg/m³ Miyazaki, 7 September: 6.9 µg/m³ Miyazaki, 8 September: 6.2 µg/m³ Miyazaki, 9 September: 10.3 µg/m³ Miyazaki, 10 September: 3.1 µg/m³ Miyazaki, 11 September: 3.4 µg/m³ Kumamoto Kumamoto, 31 August: 7.5 µg/m³ Kumamoto, 1 September: 14.5 µg/m³ Kumamoto, 2 September: 14.1 µg/m³ Kumamoto, 3 September: 17.8 µg/m³ Kumamoto, 4 September: 26.6 µg/m³, 3.5× its usual 7.5 Kumamoto, 5 September: 25.9 µg/m³, 3.5× its usual 7.4 Kumamoto, 6 September: 29.5 µg/m³, 4.1× its usual 7.2 Kumamoto, 7 September: 27.2 µg/m³, 3.8× its usual 7.1 Kumamoto, 8 September: 26.2 µg/m³, 3.7× its usual 7.1 Kumamoto, 9 September: 15.3 µg/m³ Kumamoto, 10 September: 3.3 µg/m³ Kumamoto, 11 September: 4.2 µg/m³ Ōzu Ōzu, 31 August: 8.1 µg/m³ Ōzu, 1 September: 16.1 µg/m³ Ōzu, 2 September: 17.4 µg/m³ Ōzu, 3 September: 17.8 µg/m³ Ōzu, 4 September: 26.5 µg/m³, 3.2× its usual 8.2 Ōzu, 5 September: 22.8 µg/m³ Ōzu, 6 September: 27.3 µg/m³, 3.4× its usual 8.1 Ōzu, 7 September: 28.2 µg/m³, 3.5× its usual 8.0 Ōzu, 8 September: 21.1 µg/m³ Ōzu, 9 September: 16.1 µg/m³ Ōzu, 10 September: 3.9 µg/m³ Ōzu, 11 September: 5.4 µg/m³ Mifune Mifune, 31 August: 6.5 µg/m³ Mifune, 1 September: 13.0 µg/m³ Mifune, 2 September: 13.9 µg/m³ Mifune, 3 September: 16.4 µg/m³ Mifune, 4 September: 25.7 µg/m³, 3.5× its usual 7.4 Mifune, 5 September: 20.6 µg/m³ Mifune, 6 September: 23.4 µg/m³ Mifune, 7 September: 24.3 µg/m³ Mifune, 8 September: 21.0 µg/m³ Mifune, 9 September: 12.0 µg/m³ Mifune, 10 September: 4.1 µg/m³ Mifune, 11 September: 3.5 µg/m³ Shintomi Shintomi, 31 August: 6.4 µg/m³ Shintomi, 1 September: 10.1 µg/m³ Shintomi, 2 September: 17.5 µg/m³ Shintomi, 3 September: 19.8 µg/m³ Shintomi, 4 September: 25.2 µg/m³, 4.1× its usual 6.1 Shintomi, 5 September: 12.4 µg/m³ Shintomi, 6 September: 7.6 µg/m³ Shintomi, 7 September: 7.1 µg/m³ Shintomi, 8 September: 6.6 µg/m³ Shintomi, 9 September: 11.5 µg/m³ Shintomi, 10 September: 3.5 µg/m³ Shintomi, 11 September: 4.3 µg/m³ Kotō Kotō, 31 August: 9.2 µg/m³ Kotō, 1 September: 14.9 µg/m³ Kotō, 2 September: 13.9 µg/m³ Kotō, 3 September: 16.3 µg/m³ Kotō, 4 September: 25.0 µg/m³, 3.2× its usual 7.8 Kotō, 5 September: 26.7 µg/m³, 3.5× its usual 7.6 Kotō, 6 September: 29.1 µg/m³, 3.8× its usual 7.6 Kotō, 7 September: 27.2 µg/m³, 3.6× its usual 7.5 Kotō, 8 September: 24.5 µg/m³ Kotō, 9 September: 12.0 µg/m³ Kotō, 10 September: 4.6 µg/m³ Kotō, 11 September: 5.1 µg/m³ Hondomachi-hondo Hondomachi-hondo, 31 August: 9.1 µg/m³ Hondomachi-hondo, 1 September: 13.6 µg/m³ Hondomachi-hondo, 2 September: 9.5 µg/m³ Hondomachi-hondo, 3 September: 16.5 µg/m³ Hondomachi-hondo, 4 September: 24.3 µg/m³ Hondomachi-hondo, 5 September: 31.4 µg/m³, 3.7× its usual 8.4 Hondomachi-hondo, 6 September: 37.3 µg/m³, 4.4× its usual 8.4 Hondomachi-hondo, 7 September: 31.4 µg/m³, 3.8× its usual 8.3 Hondomachi-hondo, 8 September: 31.3 µg/m³, 3.8× its usual 8.3 Hondomachi-hondo, 9 September: 24.9 µg/m³ Hondomachi-hondo, 10 September: 5.6 µg/m³ Hondomachi-hondo, 11 September: 5.0 µg/m³ Arao Arao, 31 August: 11.0 µg/m³ Arao, 1 September: 12.0 µg/m³ Arao, 2 September: 15.0 µg/m³ Arao, 3 September: 19.6 µg/m³ Arao, 4 September: 23.0 µg/m³ Arao, 5 September: 31.4 µg/m³, 3.5× its usual 8.9 Arao, 6 September: 35.2 µg/m³, 4.0× its usual 8.8 Arao, 7 September: 36.2 µg/m³, 4.1× its usual 8.8 Arao, 8 September: 32.0 µg/m³, 3.6× its usual 8.8 Arao, 9 September: 20.1 µg/m³ Arao, 10 September: 4.8 µg/m³ Arao, 11 September: 6.0 µg/m³ Chikugo Chikugo, 31 August: 8.3 µg/m³ Chikugo, 1 September: 10.8 µg/m³ Chikugo, 2 September: 15.4 µg/m³ Chikugo, 3 September: 19.8 µg/m³ Chikugo, 4 September: 16.8 µg/m³ Chikugo, 5 September: 29.2 µg/m³, 3.0× its usual 9.8 Chikugo, 6 September: 28.9 µg/m³, 3.1× its usual 9.3 Chikugo, 7 September: 30.2 µg/m³, 3.3× its usual 9.1 Chikugo, 8 September: 29.4 µg/m³, 3.3× its usual 8.9 Chikugo, 9 September: 26.0 µg/m³ Chikugo, 10 September: 7.8 µg/m³ Chikugo, 11 September: 10.7 µg/m³ Ōmuta Ōmuta, 31 August: 9.0 µg/m³ Ōmuta, 1 September: 11.3 µg/m³ Ōmuta, 2 September: 13.6 µg/m³ Ōmuta, 3 September: 17.9 µg/m³ Ōmuta, 4 September: 19.9 µg/m³ Ōmuta, 5 September: 27.7 µg/m³, 3.3× its usual 8.3 Ōmuta, 6 September: 31.8 µg/m³, 3.8× its usual 8.3 Ōmuta, 7 September: 26.5 µg/m³, 3.2× its usual 8.3 Ōmuta, 8 September: 28.0 µg/m³, 3.4× its usual 8.3 Ōmuta, 9 September: 20.9 µg/m³ Ōmuta, 10 September: 6.1 µg/m³ Ōmuta, 11 September: 7.2 µg/m³ Tamana Tamana, 31 August: 10.2 µg/m³ Tamana, 1 September: 12.5 µg/m³ Tamana, 2 September: 14.6 µg/m³ Tamana, 3 September: 19.0 µg/m³ Tamana, 4 September: 24.8 µg/m³ Tamana, 5 September: 27.4 µg/m³, 2.9× its usual 9.6 Tamana, 6 September: 31.3 µg/m³, 3.3× its usual 9.6 Tamana, 7 September: 26.2 µg/m³, 2.8× its usual 9.4 Tamana, 8 September: 26.2 µg/m³, 2.8× its usual 9.2 Tamana, 9 September: 18.0 µg/m³ Tamana, 10 September: 5.0 µg/m³ Tamana, 11 September: 7.1 µg/m³ Kikuchi Kikuchi, 31 August: 7.4 µg/m³ Kikuchi, 1 September: 13.7 µg/m³ Kikuchi, 2 September: 17.0 µg/m³ Kikuchi, 3 September: 18.4 µg/m³ Kikuchi, 4 September: 21.8 µg/m³ Kikuchi, 5 September: 26.2 µg/m³, 3.2× its usual 8.1 Kikuchi, 6 September: 26.5 µg/m³, 3.3× its usual 8.1 Kikuchi, 7 September: 28.3 µg/m³, 3.6× its usual 7.9 Kikuchi, 8 September: 24.1 µg/m³ Kikuchi, 9 September: 15.2 µg/m³ Kikuchi, 10 September: 3.2 µg/m³ Kikuchi, 11 September: 4.1 µg/m³ Uekimachi-mōno Uekimachi-mōno, 31 August: 8.4 µg/m³ Uekimachi-mōno, 1 September: 13.5 µg/m³ Uekimachi-mōno, 2 September: 16.1 µg/m³ Uekimachi-mōno, 3 September: 19.0 µg/m³ Uekimachi-mōno, 4 September: 23.2 µg/m³ Uekimachi-mōno, 5 September: 25.6 µg/m³, 3.1× its usual 8.3 Uekimachi-mōno, 6 September: 29.9 µg/m³, 3.6× its usual 8.3 Uekimachi-mōno, 7 September: 25.4 µg/m³, 3.1× its usual 8.2 Uekimachi-mōno, 8 September: 22.3 µg/m³ Uekimachi-mōno, 9 September: 16.0 µg/m³ Uekimachi-mōno, 10 September: 3.6 µg/m³ Uekimachi-mōno, 11 September: 5.3 µg/m³ Nagasaki Nagasaki, 31 August: 7.5 µg/m³ Nagasaki, 1 September: 9.2 µg/m³ Nagasaki, 2 September: 8.3 µg/m³ Nagasaki, 3 September: 13.0 µg/m³ Nagasaki, 4 September: 17.6 µg/m³ Nagasaki, 5 September: 23.3 µg/m³ Nagasaki, 6 September: 28.0 µg/m³, 4.1× its usual 6.9 Nagasaki, 7 September: 22.9 µg/m³ Nagasaki, 8 September: 21.6 µg/m³ Nagasaki, 9 September: 18.4 µg/m³ Nagasaki, 10 September: 3.6 µg/m³ Nagasaki, 11 September: 4.9 µg/m³ Maebaru-chūō Maebaru-chūō, 31 August: 9.6 µg/m³ Maebaru-chūō, 1 September: 8.7 µg/m³ Maebaru-chūō, 2 September: 8.1 µg/m³ Maebaru-chūō, 3 September: 10.9 µg/m³ Maebaru-chūō, 4 September: 9.1 µg/m³ Maebaru-chūō, 5 September: 16.5 µg/m³ Maebaru-chūō, 6 September: 28.0 µg/m³, 3.6× its usual 7.7 Maebaru-chūō, 7 September: 24.4 µg/m³ Maebaru-chūō, 8 September: 19.5 µg/m³ Maebaru-chūō, 9 September: 19.4 µg/m³ Maebaru-chūō, 10 September: 7.6 µg/m³ Maebaru-chūō, 11 September: 6.6 µg/m³ Obita Obita, 31 August: 6.9 µg/m³ Obita, 1 September: 8.6 µg/m³ Obita, 2 September: 9.0 µg/m³ Obita, 3 September: 14.5 µg/m³ Obita, 4 September: 17.0 µg/m³ Obita, 5 September: 24.0 µg/m³ Obita, 6 September: 27.9 µg/m³, 4.1× its usual 6.8 Obita, 7 September: 24.5 µg/m³ Obita, 8 September: 24.3 µg/m³ Obita, 9 September: 20.9 µg/m³ Obita, 10 September: 2.9 µg/m³ Obita, 11 September: 5.2 µg/m³ Gotō Gotō, 31 August: 8.6 µg/m³ Gotō, 1 September: 7.3 µg/m³ Gotō, 2 September: 7.8 µg/m³ Gotō, 3 September: 11.2 µg/m³ Gotō, 4 September: 13.8 µg/m³ Gotō, 5 September: 19.3 µg/m³ Gotō, 6 September: 27.7 µg/m³, 4.1× its usual 6.7 Gotō, 7 September: 23.0 µg/m³ Gotō, 8 September: 21.9 µg/m³ Gotō, 9 September: 19.6 µg/m³ Gotō, 10 September: 7.5 µg/m³ Gotō, 11 September: 5.1 µg/m³ Nakatsu Nakatsu, 31 August: 9.3 µg/m³ Nakatsu, 1 September: 10.1 µg/m³ Nakatsu, 2 September: 16.0 µg/m³ Nakatsu, 3 September: 19.0 µg/m³ Nakatsu, 4 September: 14.1 µg/m³ Nakatsu, 5 September: 20.4 µg/m³ Nakatsu, 6 September: 27.6 µg/m³, 3.2× its usual 8.6 Nakatsu, 7 September: 26.2 µg/m³, 3.0× its usual 8.8 Nakatsu, 8 September: 26.5 µg/m³, 3.0× its usual 8.8 Nakatsu, 9 September: 24.2 µg/m³ Nakatsu, 10 September: 8.7 µg/m³ Nakatsu, 11 September: 6.7 µg/m³ Saikai Saikai, 31 August: 7.8 µg/m³ Saikai, 1 September: 7.9 µg/m³ Saikai, 2 September: 9.4 µg/m³ Saikai, 3 September: 11.6 µg/m³ Saikai, 4 September: 14.1 µg/m³ Saikai, 5 September: 22.2 µg/m³ Saikai, 6 September: 27.2 µg/m³, 4.3× its usual 6.4 Saikai, 7 September: 20.8 µg/m³ Saikai, 8 September: 21.6 µg/m³ Saikai, 9 September: 22.1 µg/m³ Saikai, 10 September: 4.9 µg/m³ Saikai, 11 September: 3.7 µg/m³ Isahaya Isahaya, 31 August: 9.9 µg/m³ Isahaya, 1 September: 9.1 µg/m³ Isahaya, 2 September: 9.3 µg/m³ Isahaya, 3 September: 15.2 µg/m³ Isahaya, 4 September: 19.2 µg/m³ Isahaya, 5 September: 23.8 µg/m³ Isahaya, 6 September: 26.6 µg/m³, 4.0× its usual 6.6 Isahaya, 7 September: 22.9 µg/m³ Isahaya, 8 September: 24.2 µg/m³ Isahaya, 9 September: 18.3 µg/m³ Isahaya, 10 September: 3.7 µg/m³ Isahaya, 11 September: 4.2 µg/m³ Togitsu Togitsu, 31 August: 8.5 µg/m³ Togitsu, 1 September: 9.3 µg/m³ Togitsu, 2 September: 9.3 µg/m³ Togitsu, 3 September: 13.5 µg/m³ Togitsu, 4 September: 16.5 µg/m³ Togitsu, 5 September: 22.2 µg/m³ Togitsu, 6 September: 26.4 µg/m³, 3.6× its usual 7.3 Togitsu, 7 September: 23.1 µg/m³ Togitsu, 8 September: 23.0 µg/m³ Togitsu, 9 September: 21.5 µg/m³ Togitsu, 10 September: 5.5 µg/m³ Togitsu, 11 September: 5.0 µg/m³ Ōmura Ōmura, 31 August: 7.7 µg/m³ Ōmura, 1 September: 9.2 µg/m³ Ōmura, 2 September: 9.3 µg/m³ Ōmura, 3 September: 16.0 µg/m³ Ōmura, 4 September: 17.5 µg/m³ Ōmura, 5 September: 24.0 µg/m³ Ōmura, 6 September: 26.1 µg/m³, 3.8× its usual 6.9 Ōmura, 7 September: 23.6 µg/m³ Ōmura, 8 September: 25.0 µg/m³, 3.6× its usual 6.9 Ōmura, 9 September: 19.8 µg/m³ Ōmura, 10 September: 3.7 µg/m³ Ōmura, 11 September: 4.1 µg/m³ Matsuura Matsuura, 31 August: 8.3 µg/m³ Matsuura, 1 September: 6.9 µg/m³ Matsuura, 2 September: 9.6 µg/m³ Matsuura, 3 September: 10.5 µg/m³ Matsuura, 4 September: 9.4 µg/m³ Matsuura, 5 September: 19.5 µg/m³ Matsuura, 6 September: 25.9 µg/m³, 3.7× its usual 7.0 Matsuura, 7 September: 18.6 µg/m³ Matsuura, 8 September: 18.8 µg/m³ Matsuura, 9 September: 19.0 µg/m³ Matsuura, 10 September: 9.3 µg/m³ Matsuura, 11 September: 7.5 µg/m³ Sasebo Sasebo, 31 August: 8.5 µg/m³ Sasebo, 1 September: 8.5 µg/m³ Sasebo, 2 September: 9.6 µg/m³ Sasebo, 3 September: 12.9 µg/m³ Sasebo, 4 September: 14.6 µg/m³ Sasebo, 5 September: 21.0 µg/m³ Sasebo, 6 September: 25.9 µg/m³, 3.4× its usual 7.6 Sasebo, 7 September: 21.9 µg/m³ Sasebo, 8 September: 23.2 µg/m³ Sasebo, 9 September: 20.8 µg/m³ Sasebo, 10 September: 7.3 µg/m³ Sasebo, 11 September: 6.7 µg/m³ Ukiha Ukiha, 31 August: 8.0 µg/m³ Ukiha, 1 September: 10.0 µg/m³ Ukiha, 2 September: 16.7 µg/m³ Ukiha, 3 September: 21.6 µg/m³ Ukiha, 4 September: 15.5 µg/m³ Ukiha, 5 September: 21.1 µg/m³ Ukiha, 6 September: 25.5 µg/m³, 3.1× its usual 8.3 Ukiha, 7 September: 27.1 µg/m³, 3.3× its usual 8.3 Ukiha, 8 September: 25.7 µg/m³, 3.1× its usual 8.2 Ukiha, 9 September: 20.0 µg/m³ Ukiha, 10 September: 4.6 µg/m³ Ukiha, 11 September: 10.0 µg/m³ Yamaga Yamaga, 31 August: 7.1 µg/m³ Yamaga, 1 September: 12.2 µg/m³ Yamaga, 2 September: 13.6 µg/m³ Yamaga, 3 September: 18.1 µg/m³ Yamaga, 4 September: 19.7 µg/m³ Yamaga, 5 September: 24.0 µg/m³ Yamaga, 6 September: 25.3 µg/m³, 3.1× its usual 8.2 Yamaga, 7 September: 25.6 µg/m³, 3.1× its usual 8.2 Yamaga, 8 September: 25.1 µg/m³, 3.1× its usual 8.1 Yamaga, 9 September: 15.6 µg/m³ Yamaga, 10 September: 3.7 µg/m³ Yamaga, 11 September: 5.4 µg/m³ Ōita Ōita, 31 August: 6.7 µg/m³ Ōita, 1 September: 7.7 µg/m³ Ōita, 2 September: 16.3 µg/m³ Ōita, 3 September: 24.0 µg/m³ Ōita, 4 September: 17.2 µg/m³ Ōita, 5 September: 15.4 µg/m³ Ōita, 6 September: 20.4 µg/m³ Ōita, 7 September: 28.4 µg/m³, 3.9× its usual 7.3 Ōita, 8 September: 21.0 µg/m³ Ōita, 9 September: 21.5 µg/m³ Ōita, 10 September: 5.2 µg/m³ Ōita, 11 September: 4.0 µg/m³ Yamanashi Yamanashi, 31 August: no reading Yamanashi, 1 September: no reading Yamanashi, 2 September: no reading Yamanashi, 3 September: no reading Yamanashi, 4 September: no reading Yamanashi, 5 September: no reading Yamanashi, 6 September: no reading Yamanashi, 7 September: 27.1 µg/m³, 3.5× its usual 7.8 Yamanashi, 8 September: 22.9 µg/m³ Yamanashi, 9 September: no reading Yamanashi, 10 September: no reading Yamanashi, 11 September: no reading Mito Mito, 31 August: 6.5 µg/m³ Mito, 1 September: no reading Mito, 2 September: no reading Mito, 3 September: no reading Mito, 4 September: no reading Mito, 5 September: no reading Mito, 6 September: no reading Mito, 7 September: 26.7 µg/m³, 3.5× its usual 7.6 Mito, 8 September: 21.3 µg/m³ Mito, 9 September: 11.2 µg/m³ Mito, 10 September: no reading Mito, 11 September: no reading Kurume Kurume, 31 August: 8.1 µg/m³ Kurume, 1 September: 9.8 µg/m³ Kurume, 2 September: 12.6 µg/m³ Kurume, 3 September: 17.5 µg/m³ Kurume, 4 September: 14.0 µg/m³ Kurume, 5 September: 21.2 µg/m³ Kurume, 6 September: 24.4 µg/m³ Kurume, 7 September: 25.8 µg/m³, 3.1× its usual 8.4 Kurume, 8 September: 25.4 µg/m³, 3.0× its usual 8.4 Kurume, 9 September: 21.2 µg/m³ Kurume, 10 September: 7.5 µg/m³ Kurume, 11 September: 8.2 µg/m³ Ōtsuki Ōtsuki, 31 August: 11.0 µg/m³ Ōtsuki, 1 September: 10.8 µg/m³ Ōtsuki, 2 September: 12.1 µg/m³ Ōtsuki, 3 September: 15.0 µg/m³ Ōtsuki, 4 September: 15.8 µg/m³ Ōtsuki, 5 September: 14.4 µg/m³ Ōtsuki, 6 September: 21.0 µg/m³ Ōtsuki, 7 September: 25.5 µg/m³, 2.3× its usual 11.2 Ōtsuki, 8 September: 26.3 µg/m³, 2.3× its usual 11.4 Ōtsuki, 9 September: 20.5 µg/m³ Ōtsuki, 10 September: 12.0 µg/m³ Ōtsuki, 11 September: 15.2 µg/m³ Yufu Yufu, 31 August: no reading Yufu, 1 September: 4.1 µg/m³ Yufu, 2 September: 14.1 µg/m³ Yufu, 3 September: 17.4 µg/m³ Yufu, 4 September: 13.1 µg/m³ Yufu, 5 September: 10.9 µg/m³ Yufu, 6 September: 20.7 µg/m³ Yufu, 7 September: 25.0 µg/m³, 2.8× its usual 9.0 Yufu, 8 September: 17.8 µg/m³ Yufu, 9 September: 16.0 µg/m³ Yufu, 10 September: no reading Yufu, 11 September: 3.6 µg/m³ Takasaki Takasaki, 31 August: 6.6 µg/m³ Takasaki, 1 September: 8.3 µg/m³ Takasaki, 2 September: 17.1 µg/m³ Takasaki, 3 September: 6.1 µg/m³ Takasaki, 4 September: 9.9 µg/m³ Takasaki, 5 September: 13.3 µg/m³ Takasaki, 6 September: 16.0 µg/m³ Takasaki, 7 September: 25.0 µg/m³, 2.0× its usual 12.5 Takasaki, 8 September: 24.4 µg/m³ Takasaki, 9 September: 13.5 µg/m³ Takasaki, 10 September: 15.8 µg/m³ Takasaki, 11 September: 15.1 µg/m³ Tongyeong Tongyeong, 31 August: 15.8 µg/m³ Tongyeong, 1 September: 12.5 µg/m³ Tongyeong, 2 September: 17.5 µg/m³ Tongyeong, 3 September: 15.0 µg/m³ Tongyeong, 4 September: 9.7 µg/m³ Tongyeong, 5 September: 10.0 µg/m³ Tongyeong, 6 September: 16.8 µg/m³ Tongyeong, 7 September: 21.9 µg/m³ Tongyeong, 8 September: 29.1 µg/m³, 2.9× its usual 10.1 Tongyeong, 9 September: 11.7 µg/m³ Tongyeong, 10 September: 9.7 µg/m³ Tongyeong, 11 September: 8.4 µg/m³ Naesŏ Naesŏ, 31 August: 12.3 µg/m³ Naesŏ, 1 September: 13.2 µg/m³ Naesŏ, 2 September: 17.8 µg/m³ Naesŏ, 3 September: 11.5 µg/m³ Naesŏ, 4 September: 7.4 µg/m³ Naesŏ, 5 September: 11.9 µg/m³ Naesŏ, 6 September: 13.8 µg/m³ Naesŏ, 7 September: 17.8 µg/m³ Naesŏ, 8 September: 28.1 µg/m³, 3.2× its usual 8.9 Naesŏ, 9 September: 15.0 µg/m³ Naesŏ, 10 September: 10.4 µg/m³ Naesŏ, 11 September: 11.0 µg/m³ Kasaoka Kasaoka, 31 August: 6.6 µg/m³ Kasaoka, 1 September: 8.8 µg/m³ Kasaoka, 2 September: 12.2 µg/m³ Kasaoka, 3 September: 16.0 µg/m³ Kasaoka, 4 September: 14.0 µg/m³ Kasaoka, 5 September: 17.7 µg/m³ Kasaoka, 6 September: 19.6 µg/m³ Kasaoka, 7 September: 21.7 µg/m³ Kasaoka, 8 September: 28.0 µg/m³, 3.0× its usual 9.4 Kasaoka, 9 September: 18.2 µg/m³ Kasaoka, 10 September: 8.7 µg/m³ Kasaoka, 11 September: 8.2 µg/m³ Pyeongtaek Pyeongtaek, 31 August: 21.8 µg/m³ Pyeongtaek, 1 September: 22.6 µg/m³ Pyeongtaek, 2 September: 14.9 µg/m³ Pyeongtaek, 3 September: 5.3 µg/m³ Pyeongtaek, 4 September: 6.5 µg/m³ Pyeongtaek, 5 September: 13.7 µg/m³ Pyeongtaek, 6 September: 10.1 µg/m³ Pyeongtaek, 7 September: 12.2 µg/m³ Pyeongtaek, 8 September: 26.5 µg/m³, 2.6× its usual 10.3 Pyeongtaek, 9 September: 23.4 µg/m³ Pyeongtaek, 10 September: 20.7 µg/m³ Pyeongtaek, 11 September: 20.0 µg/m³ Buzen Buzen, 31 August: 6.1 µg/m³ Buzen, 1 September: 6.4 µg/m³ Buzen, 2 September: 11.8 µg/m³ Buzen, 3 September: 15.3 µg/m³ Buzen, 4 September: 10.6 µg/m³ Buzen, 5 September: 15.6 µg/m³ Buzen, 6 September: 22.1 µg/m³ Buzen, 7 September: 21.5 µg/m³ Buzen, 8 September: 25.3 µg/m³, 3.7× its usual 6.9 Buzen, 9 September: 18.6 µg/m³ Buzen, 10 September: 5.5 µg/m³ Buzen, 11 September: 4.6 µg/m³ Sandachō Sandachō, 31 August: 4.8 µg/m³ Sandachō, 1 September: 8.2 µg/m³ Sandachō, 2 September: 12.7 µg/m³ Sandachō, 3 September: 10.4 µg/m³ Sandachō, 4 September: 10.0 µg/m³ Sandachō, 5 September: 12.9 µg/m³ Sandachō, 6 September: 18.9 µg/m³ Sandachō, 7 September: 22.9 µg/m³ Sandachō, 8 September: 25.1 µg/m³, 2.9× its usual 8.7 Sandachō, 9 September: 11.8 µg/m³ Sandachō, 10 September: 5.8 µg/m³ Sandachō, 11 September: 10.7 µg/m³ 31 Aug 1 Sep 2 4 6 8 10 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
Nichinan Miyazaki, Japan 1 4 September 5.6 4.9× Miyazaki Miyazaki, Japan 1 4 September 5.4 4.9× Ōyanomachi-noboritate Kumamoto, Japan 5 6 September 7.5 4.6× Miyakonojō Miyazaki, Japan 1 4 September 6.4 4.5× Hondomachi-hondo Kumamoto, Japan 4 6 September 8.4 4.4× Saiki Oita, Japan 1 3 September 6.8 4.3× Saikai Nagasaki, Japan 1 6 September 6.4 4.3× Arao Kumamoto, Japan 4 7 September 8.8 4.1× Kumamoto Kumamoto, Japan 5 6 September 7.2 4.1× Nagasaki Nagasaki, Japan 1 6 September 6.9 4.1× Obita Nagasaki, Japan 1 6 September 6.8 4.1× Gotō Nagasaki, Japan 1 6 September 6.7 4.1× Shintomi Miyazaki, Japan 1 4 September 6.1 4.1× Isahaya Nagasaki, Japan 1 6 September 6.6 4.0× Minamata Kumamoto, Japan 5 5 September 8.2 3.9× Ōita Oita, Japan 1 7 September 7.3 3.9× Takanabe Miyazaki, Japan 2 3 September 6.7 3.9× Ōmuta Fukuoka, Japan 4 6 September 8.3 3.8× Kotō Kumamoto, Japan 4 6 September 7.6 3.8× Hyūga Miyazaki, Japan 1 3 September 6.9 3.8× Ōmura Nagasaki, Japan 2 6 September 6.9 3.8× Uto Kumamoto, Japan 4 6 September 7.9 3.7× Nobeoka Miyazaki, Japan 1 3 September 7.5 3.7× Matsuura Nagasaki, Japan 1 6 September 7.0 3.7× Buzen Fukuoka, Japan 1 8 September 6.9 3.7× Uekimachi-mōno Kumamoto, Japan 3 6 September 8.3 3.6× Kikuchi Kumamoto, Japan 3 7 September 7.9 3.6× Maebaru-chūō Fukuoka, Japan 1 6 September 7.7 3.6× Togitsu Nagasaki, Japan 1 6 September 7.3 3.6× Honmachi Kumamoto, Japan 5 5 September 8.8 3.5× Ōzu Kumamoto, Japan 3 7 September 8.0 3.5× Yamanashi Yamanashi, Japan 1 7 September 7.8 3.5× Mito Ibaraki, Japan 1 7 September 7.6 3.5× Mifune Kumamoto, Japan 1 4 September 7.4 3.5× Sasebo Nagasaki, Japan 1 6 September 7.6 3.4× Tamana Kumamoto, Japan 4 6 September 9.6 3.3× Chikugo Fukuoka, Japan 4 7 September 9.1 3.3× Ukiha Fukuoka, Japan 3 7 September 8.3 3.3× Naesŏ Gyeongsangnam-do, South Korea 1 8 September 8.9 3.2× Nakatsu Oita, Japan 3 6 September 8.6 3.2× Kurume Fukuoka, Japan 2 7 September 8.4 3.1× Yamaga Kumamoto, Japan 3 7 September 8.2 3.1× Kasaoka Okayama, Japan 1 8 September 9.4 3.0× Tongyeong Gyeongsangnam-do, South Korea 1 8 September 10.1 2.9× Sandachō Hyōgo, Japan 1 8 September 8.7 2.9× Yufu Oita, Japan 1 7 September 9.0 2.8× Pyeongtaek Gyeonggi-do, South Korea 1 8 September 10.3 2.6× Ōtsuki Yamanashi, Japan 2 8 September 11.4 2.3× Takasaki Gunma, Japan 1 7 September 12.5 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 Japan and South Korea
Number 39 of 94 episodes in Japan and South Korea since our records began, by cities reached.
Japan and South Korea, June and July 2025 508 Japan and South Korea, April 2024 499 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, 21 to 25 July 2026 172 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 Japan, November 2023 131 South Korea and Japan, November 2025 128 Japan and South Korea, September 2024 49 Bars: cities reached; colour: the level of the episode's highest daily reading. All 94 .
Use this page SmogRank, Japan and South Korea, September 2024: 49 cities with PM2.5 at twice their usual or more, 3 to 8 September 2024, smogrank.com/episodes/2024-09-japan-and-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.
