SmogRank / Episodes / Japan
Japan, 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 Kurume Yamaga Naesŏ Nakatsu Ukiha Chikugo Tamana Sasebo Yamanashi Mito Mifune Ōzu Honmachi Maebaru-chūō Togitsu Kikuchi Uekimachi-mōno Buzen Matsuura Uto Nobeoka Ōmura Ōmuta Kotō Hyūga Ōita Minamata Takanabe Isahaya Gotō Nagasaki Obita Arao Shintomi Kumamoto 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, 1.5× usual Saiki, 1 September: 10.3 µg/m³, 1.5× usual Saiki, 2 September: 20.7 µg/m³, 3.0× usual Saiki, 3 September: 29.1 µg/m³, 4.3× usual Saiki, 4 September: 24.1 µg/m³, 3.5× usual Saiki, 5 September: 15.5 µg/m³, 2.3× usual Saiki, 6 September: 12.8 µg/m³, 1.9× usual Saiki, 7 September: 11.2 µg/m³, 1.6× usual Saiki, 8 September: 15.4 µg/m³, 2.3× usual Saiki, 9 September: 17.1 µg/m³, 2.5× usual Saiki, 10 September: 5.9 µg/m³, 0.9× usual Saiki, 11 September: 5.4 µg/m³, 0.8× usual Nobeoka Nobeoka, 31 August: 8.1 µg/m³, 1.1× usual Nobeoka, 1 September: 9.9 µg/m³, 1.3× usual Nobeoka, 2 September: 18.1 µg/m³, 2.4× usual Nobeoka, 3 September: 27.6 µg/m³, 3.7× usual Nobeoka, 4 September: 23.4 µg/m³, 3.1× usual Nobeoka, 5 September: 14.1 µg/m³, 1.9× usual Nobeoka, 6 September: 10.2 µg/m³, 1.4× usual Nobeoka, 7 September: 10.1 µg/m³, 1.3× usual Nobeoka, 8 September: 12.0 µg/m³, 1.6× usual Nobeoka, 9 September: 13.7 µg/m³, 1.8× usual Nobeoka, 10 September: 3.8 µg/m³, 0.5× usual Nobeoka, 11 September: 3.8 µg/m³, 0.5× usual Hyūga Hyūga, 31 August: 7.7 µg/m³, 1.1× usual Hyūga, 1 September: 10.9 µg/m³, 1.6× usual Hyūga, 2 September: 16.7 µg/m³, 2.4× usual Hyūga, 3 September: 26.1 µg/m³, 3.8× usual Hyūga, 4 September: 24.8 µg/m³, 3.6× usual Hyūga, 5 September: 13.2 µg/m³, 1.9× usual 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, 1.8× usual Takanabe, 2 September: 19.5 µg/m³, 2.9× usual Takanabe, 3 September: 26.0 µg/m³, 3.9× usual Takanabe, 4 September: 25.6 µg/m³, 3.8× usual Takanabe, 5 September: 12.3 µg/m³, 1.8× usual Takanabe, 6 September: 8.5 µg/m³, 1.3× usual Takanabe, 7 September: 7.7 µg/m³, 1.1× usual Takanabe, 8 September: 8.5 µg/m³, 1.3× usual Takanabe, 9 September: 12.9 µg/m³, 1.9× usual Takanabe, 10 September: 3.8 µg/m³, 0.6× usual Takanabe, 11 September: 3.9 µg/m³, 0.6× usual Minamata Minamata, 31 August: 10.2 µg/m³, 1.2× usual Minamata, 1 September: 14.3 µg/m³, 1.7× usual Minamata, 2 September: 12.5 µg/m³, 1.5× usual Minamata, 3 September: 12.9 µg/m³, 1.6× usual Minamata, 4 September: 31.6 µg/m³, 3.9× usual Minamata, 5 September: 31.9 µg/m³, 3.9× usual Minamata, 6 September: 29.5 µg/m³, 3.6× usual Minamata, 7 September: 29.9 µg/m³, 3.6× usual Minamata, 8 September: 26.4 µg/m³, 3.2× usual Minamata, 9 September: 16.1 µg/m³, 2.0× usual Minamata, 10 September: 3.4 µg/m³, 0.4× usual Minamata, 11 September: 5.6 µg/m³, 0.7× usual Honmachi Honmachi, 31 August: 8.5 µg/m³, 1.0× usual Honmachi, 1 September: 14.3 µg/m³, 1.6× usual Honmachi, 2 September: 14.0 µg/m³, 1.6× usual Honmachi, 3 September: 17.8 µg/m³, 2.0× usual Honmachi, 4 September: 29.4 µg/m³, 3.3× usual Honmachi, 5 September: 30.6 µg/m³, 3.5× usual Honmachi, 6 September: 27.9 µg/m³, 3.2× usual Honmachi, 7 September: 29.9 µg/m³, 3.4× usual Honmachi, 8 September: 29.7 µg/m³, 3.4× usual Honmachi, 9 September: 21.7 µg/m³, 2.5× usual Honmachi, 10 September: 7.1 µg/m³, 0.8× usual Honmachi, 11 September: 5.9 µg/m³, 0.7× usual Miyakonojō Miyakonojō, 31 August: 8.6 µg/m³, 1.3× usual Miyakonojō, 1 September: 13.3 µg/m³, 2.1× usual Miyakonojō, 2 September: 18.9 µg/m³, 3.0× usual Miyakonojō, 3 September: 20.6 µg/m³, 3.2× usual Miyakonojō, 4 September: 29.0 µg/m³, 4.5× usual Miyakonojō, 5 September: 15.2 µg/m³, 2.4× usual Miyakonojō, 6 September: 10.7 µg/m³, 1.7× usual Miyakonojō, 7 September: 8.2 µg/m³, 1.3× usual Miyakonojō, 8 September: 7.0 µg/m³, 1.1× usual Miyakonojō, 9 September: 9.9 µg/m³, 1.5× usual Miyakonojō, 10 September: 2.8 µg/m³, 0.4× usual Miyakonojō, 11 September: 3.8 µg/m³, 0.6× usual Uto Uto, 31 August: 9.5 µg/m³, 1.2× usual Uto, 1 September: 12.6 µg/m³, 1.6× usual Uto, 2 September: 13.0 µg/m³, 1.6× usual Uto, 3 September: 16.9 µg/m³, 2.1× usual Uto, 4 September: 28.2 µg/m³, 3.6× usual Uto, 5 September: 24.6 µg/m³, 3.1× usual Uto, 6 September: 29.4 µg/m³, 3.7× usual Uto, 7 September: 26.5 µg/m³, 3.4× usual Uto, 8 September: 25.4 µg/m³, 3.2× usual Uto, 9 September: 13.2 µg/m³, 1.7× usual Uto, 10 September: 5.5 µg/m³, 0.7× usual Uto, 11 September: 5.9 µg/m³, 0.7× usual Nichinan Nichinan, 31 August: no reading Nichinan, 1 September: 9.6 µg/m³, 1.7× usual Nichinan, 2 September: 15.8 µg/m³, 2.8× usual Nichinan, 3 September: 18.6 µg/m³, 3.3× usual Nichinan, 4 September: 27.6 µg/m³, 4.9× usual Nichinan, 5 September: 11.9 µg/m³, 2.1× usual Nichinan, 6 September: 7.6 µg/m³, 1.4× usual Nichinan, 7 September: 6.3 µg/m³, 1.1× usual Nichinan, 8 September: 4.8 µg/m³, 0.9× usual Nichinan, 9 September: 8.2 µg/m³, 1.5× usual Nichinan, 10 September: 4.1 µg/m³, 0.7× usual Nichinan, 11 September: 4.0 µg/m³, 0.7× usual Ōyanomachi-noborita… Ōyanomachi-noboritate, 31 August: 8.8 µg/m³, 1.2× usual Ōyanomachi-noboritate, 1 September: 12.8 µg/m³, 1.7× usual Ōyanomachi-noboritate, 2 September: 10.6 µg/m³, 1.4× usual Ōyanomachi-noboritate, 3 September: 15.7 µg/m³, 2.1× usual Ōyanomachi-noboritate, 4 September: 26.8 µg/m³, 3.6× usual Ōyanomachi-noboritate, 5 September: 31.5 µg/m³, 4.2× usual Ōyanomachi-noboritate, 6 September: 34.5 µg/m³, 4.6× usual Ōyanomachi-noboritate, 7 September: 31.3 µg/m³, 4.2× usual Ōyanomachi-noboritate, 8 September: 30.5 µg/m³, 4.1× usual Ōyanomachi-noboritate, 9 September: 21.5 µg/m³, 2.9× usual Ōyanomachi-noboritate, 10 September: 5.2 µg/m³, 0.7× usual Ōyanomachi-noboritate, 11 September: 5.5 µg/m³, 0.7× usual Miyazaki Miyazaki, 31 August: 6.2 µg/m³, 1.1× usual Miyazaki, 1 September: 9.1 µg/m³, 1.7× usual Miyazaki, 2 September: 15.9 µg/m³, 2.9× usual Miyazaki, 3 September: 20.6 µg/m³, 3.8× usual Miyazaki, 4 September: 26.6 µg/m³, 4.9× usual Miyazaki, 5 September: 13.5 µg/m³, 2.5× usual Miyazaki, 6 September: 7.8 µg/m³, 1.4× usual Miyazaki, 7 September: 6.9 µg/m³, 1.3× usual Miyazaki, 8 September: 6.2 µg/m³, 1.1× usual Miyazaki, 9 September: 10.3 µg/m³, 1.9× usual Miyazaki, 10 September: 3.1 µg/m³, 0.6× usual Miyazaki, 11 September: 3.4 µg/m³, 0.6× usual Kumamoto Kumamoto, 31 August: 7.5 µg/m³, 1.0× usual Kumamoto, 1 September: 14.5 µg/m³, 2.0× usual Kumamoto, 2 September: 14.1 µg/m³, 2.0× usual Kumamoto, 3 September: 17.8 µg/m³, 2.5× usual Kumamoto, 4 September: 26.6 µg/m³, 3.7× usual Kumamoto, 5 September: 25.9 µg/m³, 3.6× usual Kumamoto, 6 September: 29.5 µg/m³, 4.1× usual Kumamoto, 7 September: 27.2 µg/m³, 3.8× usual Kumamoto, 8 September: 26.2 µg/m³, 3.6× usual Kumamoto, 9 September: 15.3 µg/m³, 2.1× usual Kumamoto, 10 September: 3.3 µg/m³, 0.5× usual Kumamoto, 11 September: 4.2 µg/m³, 0.6× usual Ōzu Ōzu, 31 August: 8.1 µg/m³, 1.0× usual Ōzu, 1 September: 16.1 µg/m³, 2.0× usual Ōzu, 2 September: 17.4 µg/m³, 2.2× usual Ōzu, 3 September: 17.8 µg/m³, 2.2× usual Ōzu, 4 September: 26.5 µg/m³, 3.3× usual Ōzu, 5 September: 22.8 µg/m³, 2.9× usual Ōzu, 6 September: 27.3 µg/m³, 3.4× usual Ōzu, 7 September: 28.2 µg/m³, 3.5× usual Ōzu, 8 September: 21.1 µg/m³, 2.6× usual Ōzu, 9 September: 16.1 µg/m³, 2.0× usual Ōzu, 10 September: 3.9 µg/m³, 0.5× usual Ōzu, 11 September: 5.4 µg/m³, 0.7× usual Mifune Mifune, 31 August: 6.5 µg/m³, 0.9× usual Mifune, 1 September: 13.0 µg/m³, 1.8× usual Mifune, 2 September: 13.9 µg/m³, 1.9× usual Mifune, 3 September: 16.4 µg/m³, 2.2× usual Mifune, 4 September: 25.7 µg/m³, 3.5× usual Mifune, 5 September: 20.6 µg/m³, 2.8× usual Mifune, 6 September: 23.4 µg/m³, 3.2× usual Mifune, 7 September: 24.3 µg/m³, 3.3× usual Mifune, 8 September: 21.0 µg/m³, 2.8× usual Mifune, 9 September: 12.0 µg/m³, 1.6× usual Mifune, 10 September: 4.1 µg/m³, 0.6× usual Mifune, 11 September: 3.5 µg/m³, 0.5× usual Shintomi Shintomi, 31 August: 6.4 µg/m³, 1.0× usual Shintomi, 1 September: 10.1 µg/m³, 1.7× usual Shintomi, 2 September: 17.5 µg/m³, 2.9× usual Shintomi, 3 September: 19.8 µg/m³, 3.2× usual Shintomi, 4 September: 25.2 µg/m³, 4.1× usual Shintomi, 5 September: 12.4 µg/m³, 2.0× usual Shintomi, 6 September: 7.6 µg/m³, 1.2× usual Shintomi, 7 September: 7.1 µg/m³, 1.2× usual Shintomi, 8 September: 6.6 µg/m³, 1.1× usual Shintomi, 9 September: 11.5 µg/m³, 1.9× usual Shintomi, 10 September: 3.5 µg/m³, 0.6× usual Shintomi, 11 September: 4.3 µg/m³, 0.7× usual Kotō Kotō, 31 August: 9.2 µg/m³, 1.2× usual Kotō, 1 September: 14.9 µg/m³, 2.0× usual Kotō, 2 September: 13.9 µg/m³, 1.8× usual Kotō, 3 September: 16.3 µg/m³, 2.1× usual Kotō, 4 September: 25.0 µg/m³, 3.3× usual Kotō, 5 September: 26.7 µg/m³, 3.5× usual Kotō, 6 September: 29.1 µg/m³, 3.8× usual Kotō, 7 September: 27.2 µg/m³, 3.6× usual Kotō, 8 September: 24.5 µg/m³, 3.2× usual Kotō, 9 September: 12.0 µg/m³, 1.6× usual Kotō, 10 September: 4.6 µg/m³, 0.6× usual Kotō, 11 September: 5.1 µg/m³, 0.7× usual Hondomachi-hondo Hondomachi-hondo, 31 August: 9.1 µg/m³, 1.1× usual Hondomachi-hondo, 1 September: 13.6 µg/m³, 1.6× usual Hondomachi-hondo, 2 September: 9.5 µg/m³, 1.1× usual Hondomachi-hondo, 3 September: 16.5 µg/m³, 2.0× usual Hondomachi-hondo, 4 September: 24.3 µg/m³, 2.9× usual Hondomachi-hondo, 5 September: 31.4 µg/m³, 3.7× usual Hondomachi-hondo, 6 September: 37.3 µg/m³, 4.4× usual Hondomachi-hondo, 7 September: 31.4 µg/m³, 3.7× usual Hondomachi-hondo, 8 September: 31.3 µg/m³, 3.7× usual Hondomachi-hondo, 9 September: 24.9 µg/m³, 3.0× usual Hondomachi-hondo, 10 September: 5.6 µg/m³, 0.7× usual Hondomachi-hondo, 11 September: 5.0 µg/m³, 0.6× usual Arao Arao, 31 August: 11.0 µg/m³, 1.3× usual Arao, 1 September: 12.0 µg/m³, 1.4× usual Arao, 2 September: 15.0 µg/m³, 1.7× usual Arao, 3 September: 19.6 µg/m³, 2.2× usual Arao, 4 September: 23.0 µg/m³, 2.6× usual Arao, 5 September: 31.4 µg/m³, 3.6× usual Arao, 6 September: 35.2 µg/m³, 4.0× usual Arao, 7 September: 36.2 µg/m³, 4.1× usual Arao, 8 September: 32.0 µg/m³, 3.6× usual Arao, 9 September: 20.1 µg/m³, 2.3× usual Arao, 10 September: 4.8 µg/m³, 0.5× usual Arao, 11 September: 6.0 µg/m³, 0.7× usual Chikugo Chikugo, 31 August: 8.3 µg/m³, 0.9× usual Chikugo, 1 September: 10.8 µg/m³, 1.2× usual Chikugo, 2 September: 15.4 µg/m³, 1.7× usual Chikugo, 3 September: 19.8 µg/m³, 2.2× usual Chikugo, 4 September: 16.8 µg/m³, 1.8× usual Chikugo, 5 September: 29.2 µg/m³, 3.2× usual Chikugo, 6 September: 28.9 µg/m³, 3.2× usual Chikugo, 7 September: 30.2 µg/m³, 3.3× usual Chikugo, 8 September: 29.4 µg/m³, 3.2× usual Chikugo, 9 September: 26.0 µg/m³, 2.9× usual Chikugo, 10 September: 7.8 µg/m³, 0.9× usual Chikugo, 11 September: 10.7 µg/m³, 1.2× usual Ōmuta Ōmuta, 31 August: 9.0 µg/m³, 1.1× usual Ōmuta, 1 September: 11.3 µg/m³, 1.4× usual Ōmuta, 2 September: 13.6 µg/m³, 1.6× usual Ōmuta, 3 September: 17.9 µg/m³, 2.2× usual Ōmuta, 4 September: 19.9 µg/m³, 2.4× usual Ōmuta, 5 September: 27.7 µg/m³, 3.3× usual Ōmuta, 6 September: 31.8 µg/m³, 3.8× usual Ōmuta, 7 September: 26.5 µg/m³, 3.2× usual Ōmuta, 8 September: 28.0 µg/m³, 3.4× usual Ōmuta, 9 September: 20.9 µg/m³, 2.5× usual Ōmuta, 10 September: 6.1 µg/m³, 0.7× usual Ōmuta, 11 September: 7.2 µg/m³, 0.9× usual Tamana Tamana, 31 August: 10.2 µg/m³, 1.1× usual Tamana, 1 September: 12.5 µg/m³, 1.3× usual Tamana, 2 September: 14.6 µg/m³, 1.5× usual Tamana, 3 September: 19.0 µg/m³, 2.0× usual Tamana, 4 September: 24.8 µg/m³, 2.6× usual Tamana, 5 September: 27.4 µg/m³, 2.9× usual Tamana, 6 September: 31.3 µg/m³, 3.3× usual Tamana, 7 September: 26.2 µg/m³, 2.7× usual Tamana, 8 September: 26.2 µg/m³, 2.7× usual Tamana, 9 September: 18.0 µg/m³, 1.9× usual Tamana, 10 September: 5.0 µg/m³, 0.5× usual Tamana, 11 September: 7.1 µg/m³, 0.7× usual Kikuchi Kikuchi, 31 August: 7.4 µg/m³, 0.9× usual Kikuchi, 1 September: 13.7 µg/m³, 1.7× usual Kikuchi, 2 September: 17.0 µg/m³, 2.2× usual Kikuchi, 3 September: 18.4 µg/m³, 2.3× usual Kikuchi, 4 September: 21.8 µg/m³, 2.8× usual Kikuchi, 5 September: 26.2 µg/m³, 3.3× usual Kikuchi, 6 September: 26.5 µg/m³, 3.4× usual Kikuchi, 7 September: 28.3 µg/m³, 3.6× usual Kikuchi, 8 September: 24.1 µg/m³, 3.1× usual Kikuchi, 9 September: 15.2 µg/m³, 1.9× usual Kikuchi, 10 September: 3.2 µg/m³, 0.4× usual Kikuchi, 11 September: 4.1 µg/m³, 0.5× usual Uekimachi-mōno Uekimachi-mōno, 31 August: 8.4 µg/m³, 1.0× usual Uekimachi-mōno, 1 September: 13.5 µg/m³, 1.6× usual Uekimachi-mōno, 2 September: 16.1 µg/m³, 1.9× usual Uekimachi-mōno, 3 September: 19.0 µg/m³, 2.3× usual Uekimachi-mōno, 4 September: 23.2 µg/m³, 2.8× usual Uekimachi-mōno, 5 September: 25.6 µg/m³, 3.1× usual Uekimachi-mōno, 6 September: 29.9 µg/m³, 3.6× usual Uekimachi-mōno, 7 September: 25.4 µg/m³, 3.1× usual Uekimachi-mōno, 8 September: 22.3 µg/m³, 2.7× usual Uekimachi-mōno, 9 September: 16.0 µg/m³, 1.9× usual Uekimachi-mōno, 10 September: 3.6 µg/m³, 0.4× usual Uekimachi-mōno, 11 September: 5.3 µg/m³, 0.6× usual Nagasaki Nagasaki, 31 August: 7.5 µg/m³, 1.1× usual Nagasaki, 1 September: 9.2 µg/m³, 1.3× usual Nagasaki, 2 September: 8.3 µg/m³, 1.2× usual Nagasaki, 3 September: 13.0 µg/m³, 1.9× usual Nagasaki, 4 September: 17.6 µg/m³, 2.6× usual Nagasaki, 5 September: 23.3 µg/m³, 3.4× usual Nagasaki, 6 September: 28.0 µg/m³, 4.1× usual Nagasaki, 7 September: 22.9 µg/m³, 3.3× usual Nagasaki, 8 September: 21.6 µg/m³, 3.1× usual Nagasaki, 9 September: 18.4 µg/m³, 2.7× usual Nagasaki, 10 September: 3.6 µg/m³, 0.5× usual Nagasaki, 11 September: 4.9 µg/m³, 0.7× usual Maebaru-chūō Maebaru-chūō, 31 August: 9.6 µg/m³, 1.2× usual Maebaru-chūō, 1 September: 8.7 µg/m³, 1.1× usual Maebaru-chūō, 2 September: 8.1 µg/m³, 1.1× usual Maebaru-chūō, 3 September: 10.9 µg/m³, 1.4× usual Maebaru-chūō, 4 September: 9.1 µg/m³, 1.2× usual Maebaru-chūō, 5 September: 16.5 µg/m³, 2.1× usual Maebaru-chūō, 6 September: 28.0 µg/m³, 3.6× usual Maebaru-chūō, 7 September: 24.4 µg/m³, 3.2× usual Maebaru-chūō, 8 September: 19.5 µg/m³, 2.5× usual Maebaru-chūō, 9 September: 19.4 µg/m³, 2.5× usual Maebaru-chūō, 10 September: 7.6 µg/m³, 1.0× usual Maebaru-chūō, 11 September: 6.6 µg/m³, 0.9× usual Obita Obita, 31 August: 6.9 µg/m³, 1.0× usual Obita, 1 September: 8.6 µg/m³, 1.3× usual Obita, 2 September: 9.0 µg/m³, 1.3× usual Obita, 3 September: 14.5 µg/m³, 2.1× usual Obita, 4 September: 17.0 µg/m³, 2.5× usual Obita, 5 September: 24.0 µg/m³, 3.5× usual Obita, 6 September: 27.9 µg/m³, 4.1× usual Obita, 7 September: 24.5 µg/m³, 3.6× usual Obita, 8 September: 24.3 µg/m³, 3.6× usual Obita, 9 September: 20.9 µg/m³, 3.1× usual Obita, 10 September: 2.9 µg/m³, 0.4× usual Obita, 11 September: 5.2 µg/m³, 0.8× usual Gotō Gotō, 31 August: 8.6 µg/m³, 1.3× usual Gotō, 1 September: 7.3 µg/m³, 1.1× usual Gotō, 2 September: 7.8 µg/m³, 1.2× usual Gotō, 3 September: 11.2 µg/m³, 1.7× usual Gotō, 4 September: 13.8 µg/m³, 2.1× usual Gotō, 5 September: 19.3 µg/m³, 2.9× usual Gotō, 6 September: 27.7 µg/m³, 4.1× usual Gotō, 7 September: 23.0 µg/m³, 3.4× usual Gotō, 8 September: 21.9 µg/m³, 3.3× usual Gotō, 9 September: 19.6 µg/m³, 2.9× usual Gotō, 10 September: 7.5 µg/m³, 1.1× usual Gotō, 11 September: 5.1 µg/m³, 0.8× usual Nakatsu Nakatsu, 31 August: 9.3 µg/m³, 1.1× usual Nakatsu, 1 September: 10.1 µg/m³, 1.2× usual Nakatsu, 2 September: 16.0 µg/m³, 1.9× usual Nakatsu, 3 September: 19.0 µg/m³, 2.2× usual Nakatsu, 4 September: 14.1 µg/m³, 1.6× usual Nakatsu, 5 September: 20.4 µg/m³, 2.4× usual Nakatsu, 6 September: 27.6 µg/m³, 3.2× usual Nakatsu, 7 September: 26.2 µg/m³, 3.0× usual Nakatsu, 8 September: 26.5 µg/m³, 3.1× usual Nakatsu, 9 September: 24.2 µg/m³, 2.8× usual Nakatsu, 10 September: 8.7 µg/m³, 1.0× usual Nakatsu, 11 September: 6.7 µg/m³, 0.8× usual Saikai Saikai, 31 August: 7.8 µg/m³, 1.2× usual Saikai, 1 September: 7.9 µg/m³, 1.2× usual Saikai, 2 September: 9.4 µg/m³, 1.5× usual Saikai, 3 September: 11.6 µg/m³, 1.8× usual Saikai, 4 September: 14.1 µg/m³, 2.2× usual Saikai, 5 September: 22.2 µg/m³, 3.5× usual Saikai, 6 September: 27.2 µg/m³, 4.3× usual Saikai, 7 September: 20.8 µg/m³, 3.3× usual Saikai, 8 September: 21.6 µg/m³, 3.4× usual Saikai, 9 September: 22.1 µg/m³, 3.5× usual Saikai, 10 September: 4.9 µg/m³, 0.8× usual Saikai, 11 September: 3.7 µg/m³, 0.6× usual Isahaya Isahaya, 31 August: 9.9 µg/m³, 1.5× usual Isahaya, 1 September: 9.1 µg/m³, 1.4× usual Isahaya, 2 September: 9.3 µg/m³, 1.4× usual Isahaya, 3 September: 15.2 µg/m³, 2.3× usual Isahaya, 4 September: 19.2 µg/m³, 2.9× usual Isahaya, 5 September: 23.8 µg/m³, 3.6× usual Isahaya, 6 September: 26.6 µg/m³, 4.0× usual Isahaya, 7 September: 22.9 µg/m³, 3.5× usual Isahaya, 8 September: 24.2 µg/m³, 3.7× usual Isahaya, 9 September: 18.3 µg/m³, 2.8× usual Isahaya, 10 September: 3.7 µg/m³, 0.6× usual Isahaya, 11 September: 4.2 µg/m³, 0.6× usual Togitsu Togitsu, 31 August: 8.5 µg/m³, 1.2× usual Togitsu, 1 September: 9.3 µg/m³, 1.3× usual Togitsu, 2 September: 9.3 µg/m³, 1.3× usual Togitsu, 3 September: 13.5 µg/m³, 1.8× usual Togitsu, 4 September: 16.5 µg/m³, 2.3× usual Togitsu, 5 September: 22.2 µg/m³, 3.0× usual Togitsu, 6 September: 26.4 µg/m³, 3.6× usual Togitsu, 7 September: 23.1 µg/m³, 3.2× usual Togitsu, 8 September: 23.0 µg/m³, 3.2× usual Togitsu, 9 September: 21.5 µg/m³, 2.9× usual Togitsu, 10 September: 5.5 µg/m³, 0.8× usual Togitsu, 11 September: 5.0 µg/m³, 0.7× usual Ōmura Ōmura, 31 August: 7.7 µg/m³, 1.1× usual Ōmura, 1 September: 9.2 µg/m³, 1.3× usual Ōmura, 2 September: 9.3 µg/m³, 1.3× usual Ōmura, 3 September: 16.0 µg/m³, 2.3× usual Ōmura, 4 September: 17.5 µg/m³, 2.5× usual Ōmura, 5 September: 24.0 µg/m³, 3.5× usual Ōmura, 6 September: 26.1 µg/m³, 3.8× usual Ōmura, 7 September: 23.6 µg/m³, 3.4× usual Ōmura, 8 September: 25.0 µg/m³, 3.6× usual Ōmura, 9 September: 19.8 µg/m³, 2.9× usual Ōmura, 10 September: 3.7 µg/m³, 0.5× usual Ōmura, 11 September: 4.1 µg/m³, 0.6× usual Matsuura Matsuura, 31 August: 8.3 µg/m³, 1.2× usual Matsuura, 1 September: 6.9 µg/m³, 1.0× usual Matsuura, 2 September: 9.6 µg/m³, 1.4× usual Matsuura, 3 September: 10.5 µg/m³, 1.5× usual Matsuura, 4 September: 9.4 µg/m³, 1.3× usual Matsuura, 5 September: 19.5 µg/m³, 2.8× usual Matsuura, 6 September: 25.9 µg/m³, 3.7× usual Matsuura, 7 September: 18.6 µg/m³, 2.7× usual Matsuura, 8 September: 18.8 µg/m³, 2.7× usual Matsuura, 9 September: 19.0 µg/m³, 2.7× usual Matsuura, 10 September: 9.3 µg/m³, 1.3× usual Matsuura, 11 September: 7.5 µg/m³, 1.1× usual Sasebo Sasebo, 31 August: 8.5 µg/m³, 1.1× usual Sasebo, 1 September: 8.5 µg/m³, 1.1× usual Sasebo, 2 September: 9.6 µg/m³, 1.3× usual Sasebo, 3 September: 12.9 µg/m³, 1.7× usual Sasebo, 4 September: 14.6 µg/m³, 1.9× usual Sasebo, 5 September: 21.0 µg/m³, 2.8× usual Sasebo, 6 September: 25.9 µg/m³, 3.4× usual Sasebo, 7 September: 21.9 µg/m³, 2.9× usual Sasebo, 8 September: 23.2 µg/m³, 3.1× usual Sasebo, 9 September: 20.8 µg/m³, 2.7× usual Sasebo, 10 September: 7.3 µg/m³, 1.0× usual Sasebo, 11 September: 6.7 µg/m³, 0.9× usual Ukiha Ukiha, 31 August: 8.0 µg/m³, 1.0× usual Ukiha, 1 September: 10.0 µg/m³, 1.2× usual Ukiha, 2 September: 16.7 µg/m³, 2.0× usual Ukiha, 3 September: 21.6 µg/m³, 2.6× usual Ukiha, 4 September: 15.5 µg/m³, 1.9× usual Ukiha, 5 September: 21.1 µg/m³, 2.5× usual Ukiha, 6 September: 25.5 µg/m³, 3.1× usual Ukiha, 7 September: 27.1 µg/m³, 3.3× usual Ukiha, 8 September: 25.7 µg/m³, 3.1× usual Ukiha, 9 September: 20.0 µg/m³, 2.4× usual Ukiha, 10 September: 4.6 µg/m³, 0.6× usual Ukiha, 11 September: 10.0 µg/m³, 1.2× usual Yamaga Yamaga, 31 August: 7.1 µg/m³, 0.9× usual Yamaga, 1 September: 12.2 µg/m³, 1.5× usual Yamaga, 2 September: 13.6 µg/m³, 1.7× usual Yamaga, 3 September: 18.1 µg/m³, 2.2× usual Yamaga, 4 September: 19.7 µg/m³, 2.4× usual Yamaga, 5 September: 24.0 µg/m³, 2.9× usual Yamaga, 6 September: 25.3 µg/m³, 3.1× usual Yamaga, 7 September: 25.6 µg/m³, 3.1× usual Yamaga, 8 September: 25.1 µg/m³, 3.1× usual Yamaga, 9 September: 15.6 µg/m³, 1.9× usual Yamaga, 10 September: 3.7 µg/m³, 0.5× usual Yamaga, 11 September: 5.4 µg/m³, 0.7× usual Ōita Ōita, 31 August: 6.7 µg/m³, 0.9× usual Ōita, 1 September: 7.7 µg/m³, 1.1× usual Ōita, 2 September: 16.3 µg/m³, 2.2× usual Ōita, 3 September: 24.0 µg/m³, 3.3× usual Ōita, 4 September: 17.2 µg/m³, 2.4× usual Ōita, 5 September: 15.4 µg/m³, 2.1× usual Ōita, 6 September: 20.4 µg/m³, 2.8× usual Ōita, 7 September: 28.4 µg/m³, 3.9× usual Ōita, 8 September: 21.0 µg/m³, 2.9× usual Ōita, 9 September: 21.5 µg/m³, 2.9× usual Ōita, 10 September: 5.2 µg/m³, 0.7× usual Ōita, 11 September: 4.0 µg/m³, 0.5× usual 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× usual Yamanashi, 8 September: 22.9 µg/m³, 2.9× usual Yamanashi, 9 September: no reading Yamanashi, 10 September: no reading Yamanashi, 11 September: no reading Mito Mito, 31 August: 6.5 µg/m³, 0.9× usual 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× usual Mito, 8 September: 21.3 µg/m³, 2.8× usual Mito, 9 September: 11.2 µg/m³, 1.5× usual Mito, 10 September: no reading Mito, 11 September: no reading Kurume Kurume, 31 August: 8.1 µg/m³, 1.0× usual Kurume, 1 September: 9.8 µg/m³, 1.2× usual Kurume, 2 September: 12.6 µg/m³, 1.5× usual Kurume, 3 September: 17.5 µg/m³, 2.1× usual Kurume, 4 September: 14.0 µg/m³, 1.7× usual Kurume, 5 September: 21.2 µg/m³, 2.5× usual Kurume, 6 September: 24.4 µg/m³, 2.9× usual Kurume, 7 September: 25.8 µg/m³, 3.1× usual Kurume, 8 September: 25.4 µg/m³, 3.0× usual Kurume, 9 September: 21.2 µg/m³, 2.5× usual Kurume, 10 September: 7.5 µg/m³, 0.9× usual Kurume, 11 September: 8.2 µg/m³, 1.0× usual Ōtsuki Ōtsuki, 31 August: 11.0 µg/m³, 1.0× usual Ōtsuki, 1 September: 10.8 µg/m³, 0.9× usual Ōtsuki, 2 September: 12.1 µg/m³, 1.1× usual Ōtsuki, 3 September: 15.0 µg/m³, 1.3× usual Ōtsuki, 4 September: 15.8 µg/m³, 1.4× usual Ōtsuki, 5 September: 14.4 µg/m³, 1.3× usual Ōtsuki, 6 September: 21.0 µg/m³, 1.8× usual Ōtsuki, 7 September: 25.5 µg/m³, 2.2× usual Ōtsuki, 8 September: 26.3 µg/m³, 2.3× usual Ōtsuki, 9 September: 20.5 µg/m³, 1.8× usual Ōtsuki, 10 September: 12.0 µg/m³, 1.1× usual Ōtsuki, 11 September: 15.2 µg/m³, 1.3× usual Yufu Yufu, 31 August: no reading Yufu, 1 September: 4.1 µg/m³, 0.5× usual Yufu, 2 September: 14.1 µg/m³, 1.6× usual Yufu, 3 September: 17.4 µg/m³, 1.9× usual Yufu, 4 September: 13.1 µg/m³, 1.5× usual Yufu, 5 September: 10.9 µg/m³, 1.2× usual Yufu, 6 September: 20.7 µg/m³, 2.3× usual Yufu, 7 September: 25.0 µg/m³, 2.8× usual Yufu, 8 September: 17.8 µg/m³, 2.0× usual Yufu, 9 September: 16.0 µg/m³, 1.8× usual Yufu, 10 September: no reading Yufu, 11 September: 3.6 µg/m³, 0.4× usual Takasaki Takasaki, 31 August: 6.6 µg/m³, 0.5× usual Takasaki, 1 September: 8.3 µg/m³, 0.7× usual Takasaki, 2 September: 17.1 µg/m³, 1.4× usual Takasaki, 3 September: 6.1 µg/m³, 0.5× usual Takasaki, 4 September: 9.9 µg/m³, 0.8× usual Takasaki, 5 September: 13.3 µg/m³, 1.1× usual Takasaki, 6 September: 16.0 µg/m³, 1.3× usual Takasaki, 7 September: 25.0 µg/m³, 2.0× usual Takasaki, 8 September: 24.4 µg/m³, 2.0× usual Takasaki, 9 September: 13.5 µg/m³, 1.1× usual Takasaki, 10 September: 15.8 µg/m³, 1.3× usual Takasaki, 11 September: 15.1 µg/m³, 1.2× usual Tongyeong Tongyeong, 31 August: 15.8 µg/m³, 1.6× usual Tongyeong, 1 September: 12.5 µg/m³, 1.2× usual Tongyeong, 2 September: 17.5 µg/m³, 1.7× usual Tongyeong, 3 September: 15.0 µg/m³, 1.5× usual Tongyeong, 4 September: 9.7 µg/m³, 1.0× usual Tongyeong, 5 September: 10.0 µg/m³, 1.0× usual Tongyeong, 6 September: 16.8 µg/m³, 1.7× usual Tongyeong, 7 September: 21.9 µg/m³, 2.2× usual Tongyeong, 8 September: 29.1 µg/m³, 2.9× usual Tongyeong, 9 September: 11.7 µg/m³, 1.2× usual Tongyeong, 10 September: 9.7 µg/m³, 1.0× usual Tongyeong, 11 September: 8.4 µg/m³, 0.8× usual Naesŏ Naesŏ, 31 August: 12.3 µg/m³, 1.4× usual Naesŏ, 1 September: 13.2 µg/m³, 1.5× usual Naesŏ, 2 September: 17.8 µg/m³, 2.0× usual Naesŏ, 3 September: 11.5 µg/m³, 1.3× usual Naesŏ, 4 September: 7.4 µg/m³, 0.8× usual Naesŏ, 5 September: 11.9 µg/m³, 1.3× usual Naesŏ, 6 September: 13.8 µg/m³, 1.6× usual Naesŏ, 7 September: 17.8 µg/m³, 2.0× usual Naesŏ, 8 September: 28.1 µg/m³, 3.2× usual Naesŏ, 9 September: 15.0 µg/m³, 1.7× usual Naesŏ, 10 September: 10.4 µg/m³, 1.2× usual Naesŏ, 11 September: 11.0 µg/m³, 1.2× usual Kasaoka Kasaoka, 31 August: 6.6 µg/m³, 0.7× usual Kasaoka, 1 September: 8.8 µg/m³, 0.9× usual Kasaoka, 2 September: 12.2 µg/m³, 1.3× usual Kasaoka, 3 September: 16.0 µg/m³, 1.7× usual Kasaoka, 4 September: 14.0 µg/m³, 1.5× usual Kasaoka, 5 September: 17.7 µg/m³, 1.9× usual Kasaoka, 6 September: 19.6 µg/m³, 2.1× usual Kasaoka, 7 September: 21.7 µg/m³, 2.3× usual Kasaoka, 8 September: 28.0 µg/m³, 3.0× usual Kasaoka, 9 September: 18.2 µg/m³, 1.9× usual Kasaoka, 10 September: 8.7 µg/m³, 0.9× usual Kasaoka, 11 September: 8.2 µg/m³, 0.9× usual Pyeongtaek Pyeongtaek, 31 August: 21.8 µg/m³, 2.1× usual Pyeongtaek, 1 September: 22.6 µg/m³, 2.2× usual Pyeongtaek, 2 September: 14.9 µg/m³, 1.4× usual Pyeongtaek, 3 September: 5.3 µg/m³, 0.5× usual Pyeongtaek, 4 September: 6.5 µg/m³, 0.6× usual Pyeongtaek, 5 September: 13.7 µg/m³, 1.3× usual Pyeongtaek, 6 September: 10.1 µg/m³, 1.0× usual Pyeongtaek, 7 September: 12.2 µg/m³, 1.2× usual Pyeongtaek, 8 September: 26.5 µg/m³, 2.6× usual Pyeongtaek, 9 September: 23.4 µg/m³, 2.3× usual Pyeongtaek, 10 September: 20.7 µg/m³, 2.0× usual Pyeongtaek, 11 September: 20.0 µg/m³, 1.9× usual Buzen Buzen, 31 August: 6.1 µg/m³, 0.9× usual Buzen, 1 September: 6.4 µg/m³, 0.9× usual Buzen, 2 September: 11.8 µg/m³, 1.7× usual Buzen, 3 September: 15.3 µg/m³, 2.2× usual Buzen, 4 September: 10.6 µg/m³, 1.5× usual Buzen, 5 September: 15.6 µg/m³, 2.3× usual Buzen, 6 September: 22.1 µg/m³, 3.2× usual Buzen, 7 September: 21.5 µg/m³, 3.1× usual Buzen, 8 September: 25.3 µg/m³, 3.7× usual Buzen, 9 September: 18.6 µg/m³, 2.7× usual Buzen, 10 September: 5.5 µg/m³, 0.8× usual Buzen, 11 September: 4.6 µg/m³, 0.7× usual Sandachō Sandachō, 31 August: 4.8 µg/m³, 0.6× usual Sandachō, 1 September: 8.2 µg/m³, 0.9× usual Sandachō, 2 September: 12.7 µg/m³, 1.5× usual Sandachō, 3 September: 10.4 µg/m³, 1.2× usual Sandachō, 4 September: 10.0 µg/m³, 1.1× usual Sandachō, 5 September: 12.9 µg/m³, 1.5× usual Sandachō, 6 September: 18.9 µg/m³, 2.2× usual Sandachō, 7 September: 22.9 µg/m³, 2.6× usual Sandachō, 8 September: 25.1 µg/m³, 2.9× usual Sandachō, 9 September: 11.8 µg/m³, 1.4× usual Sandachō, 10 September: 5.8 µg/m³, 0.7× usual Sandachō, 11 September: 10.7 µg/m³, 1.2× usual 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× Gotō Nagasaki, Japan 1 6 September 6.7 4.1× Shintomi Miyazaki, Japan 1 4 September 6.1 4.1× Arao Kumamoto, Japan 4 7 September 8.8 4.1× Obita Nagasaki, Japan 1 6 September 6.8 4.1× Kumamoto Kumamoto, Japan 5 6 September 7.2 4.1× Nagasaki Nagasaki, Japan 1 6 September 6.9 4.1× Isahaya Nagasaki, Japan 1 6 September 6.6 4.0× Ōita Oita, Japan 1 7 September 7.3 3.9× Minamata Kumamoto, Japan 5 5 September 8.2 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× Matsuura Nagasaki, Japan 1 6 September 7.0 3.7× Nobeoka Miyazaki, Japan 1 3 September 7.5 3.7× Buzen Fukuoka, Japan 1 8 September 6.9 3.7× Maebaru-chūō Fukuoka, Japan 1 6 September 7.7 3.6× Togitsu Nagasaki, Japan 1 6 September 7.3 3.6× Uekimachi-mōno Kumamoto, Japan 3 6 September 8.3 3.6× Kikuchi Kumamoto, Japan 3 7 September 7.9 3.6× Ōzu Kumamoto, Japan 3 7 September 8.0 3.5× Mito Ibaraki, Japan 1 7 September 7.6 3.5× Honmachi Kumamoto, Japan 5 5 September 8.8 3.5× Yamanashi Yamanashi, Japan 1 7 September 7.8 3.5× Mifune Kumamoto, Japan 1 4 September 7.4 3.5× Sasebo Nagasaki, Japan 1 6 September 7.6 3.4× Chikugo Fukuoka, Japan 4 7 September 9.1 3.3× Ukiha Fukuoka, Japan 3 7 September 8.3 3.3× Tamana Kumamoto, Japan 4 6 September 9.6 3.3× Nakatsu Oita, Japan 3 6 September 8.6 3.2× Naesŏ Gyeongsangnam-do, South Korea 1 8 September 8.9 3.2× Yamaga Kumamoto, Japan 3 7 September 8.2 3.1× Kurume Fukuoka, Japan 2 7 September 8.4 3.1× Kasaoka Okayama, Japan 1 8 September 9.4 3.0× Sandachō Hyōgo, Japan 1 8 September 8.7 2.9× Tongyeong Gyeongsangnam-do, South Korea 1 8 September 10.1 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. 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 39 of 94 episodes in Japan and South Korea since our records began, by cities reached.
Japan, 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, 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, September 2024 49 Bars: cities reached; colour: the level of the episode's highest daily reading. All 94 .
Use this page SmogRank, Japan, September 2024: 49 cities with PM2.5 at twice their usual or more, 3 to 8 September 2024, smogrank.com/episodes/2024-09-japan (accessed 3 October 2026).
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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.
