SmogRank / Episodes / Japan
Japan, August 2025
For 2 days, from 4 to 5 August 2025, 126 cities in Japan had PM2.5 at least twice their usual for the time of year. The worst reading was Yamanashi, Yamanashi, Japan: 44.0 µg/m³ on 5 August, about 3.3× its usual 13.4.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 126 in 1 country
Days 2 4 to 5 August 2025
Worst day 4 August 79 cities counted
Furthest above usual 4.5× Tateyama
Day by day
Play 4 August 79 cities at twice their usual or more
Seto Shinshiro Gero Minokamo Nisshin Inuyama Sekimachi Ina Nagoya Tōkai Ichinomiya Hekinan Ama Gifu Handa Takayama Hashima Tokoname Mizuho Okaya Kaminoma Suwa Ōgaki Kaizu Kuwana Ibi Matsumoto Inabe Yokkaichi Suzuka Ono Kameyama Tsu Ise Saikū Matsusaka Hikone Ueda Chikuma Saku Fujiyoshida Toyama Youkaichi Tonami Susono Uozu Kōka Nagano Imizu Oyabe Sabae Ōmihachiman Takaoka Nonoichi Fukui-shi Komatsu Matsutō Tsuruga Ōtsuki Kaga Tsubata Suzaka Takashima Kanazawa Iga Ueno-ebisumachi Nyūzen Himimachi Kusatsu Mikuni Kitahama Nabari Tomioka Hakui Chichibu Itoigawa Ōtsu Nanao Obama Uji Nakanojō Jōyō Kizugawa Kyoto Kodamachō-kodamaminami Sugai Yorii Shibukawa Nara-shi Tenri Owase Hannō Kōtari Honjō Yawata Jōetsu Yokota Kashihara-shi Hōryūji Anamizu Ikoma Hirakata Sayama Kameoka Takatsuki Numata Kashiwara Kumano Nantan Higashiosaka Yao Yono Habikino Tondabayashichō Osaka Asaka Toyonaka Sayama Kawachi-Nagano Minamiuonuma Hashimoto Maizuru Sakai Saitama Takarazuka Kawaguchi Ayabe Izumi Nishinomiya Kasukabe Miyazu Sōka Koshigaya Kishiwada Sandachō Koga Kinokawa Fukuchiyama Izumisano Misato, Saitama Matsudo Noda Kobe Nagaoka Sennan Iwade Kyōtango Tanba Sodegaura Kashiwa Jōsō Imaichi Nishiwaki Ichihara Shimo-tsuma Akashi Kainan Toride Minato Yotsukaidō Inzai Toyooka Tanabe Higashinozoe Arida Maki Sakura Kakogawachō-honmachi Ajiki Mobara Gobō Shirone Katsuura Yachimata Sumoto Narita Tōgane Inashiki Himeji Ōhara Niitsu-honchō Yokoshiba Ikaruga Nasushiobara Tatsuno Sawara Sōsa Hokota Aioi Narutochō-mitsuishi Omigawa Kashima-shi Kariya Kamisu Aizu-Wakamatsu Tokushima Shirakawa Bizen Yoshinogawa Kōriyama Shido Tsuyama Hiragi Takamatsu Okayama Tamano Kurayoshi Takinomiya Fukushima Sōja Kurashiki Marugame Zentsujichó Takahashi Ikedachō Asakuchi Niimi Kan’onjichō Aki Kasaoka Minami-Sōma Sōma Yonago Shikokuchūō Fukuyama Yasugichō Nankoku Sakaiminato Shin’ichi Kochi Onomichi Niihama Matsue Ino Mihara Saijō Unnan Susaki Miyoshi Imabari Takehara Izumo Shinagawa Higashihiroshima Matsuyama Ōdachō-ōda Yae Kure Iyo Nakamura Uwajima Kani Tsuchiura Minawa Tottori-shi Iruma Morohongō Mima Nagahama Ōme Aihara Toki Hachiōji Kiryū Ono Igusa Yaita Yachiyo Naka Tahara Akishima Mito Gyōda Kofu Menuma Sakado Sano Tokorozawa Fuchū Amagasaki Anan Chiryū Iida Minamirinkan Okazaki Tajimi Tokyo Higashimurayama Niiza Chikusei Ishioka Iwaki Kitaibaraki Ashikaga Ogawamachi Sakai-nakajima Utsunomiya Kodaira Higashikurume Kakamigahara Kamojimachō-jōgejima Nishio Atsugi Higashi-Matsuyama Kazo Yamato Azamino Anjō Fujinomiya Kariya Machida Yamanashi Mooka Kaminokawa Kawagoe Oyama Tatebayashi Kamagaya Ayase Noborito Minamiashigara Fukuroi Gotemba Hadano Kakegawa Toba Toyota Minami-Alps Ageo Kukichūō Kumagaya Tochigi Narashino Hiratsuka Yokohama Kōnosu Minamichita Ebina Atami Chigasaki Gamagōri Kamakura Numazu Toyohashi Nasukarasuyama Bandō Hitachiomiya Minamibōsō Izunokuni Chiba Fuji Fujisawa Iwata Odawara Shimada Shizuoka Urayasu Shingū Hitachi-Naka Kasama Kanuma Miura Fujieda Kisarazu Yokosuka Hitachi Hanyū Ōta Kosai Hamamatsu Kikugawa Kimitsu Hamakita Kurihama Shima Shimoda Tateyama 1 Aug 2 3 4 5 6 7 8 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
Ayase Ayase, 1 August: 6.6 µg/m³, 0.6× usual Ayase, 2 August: 11.5 µg/m³, 1.1× usual Ayase, 3 August: 15.6 µg/m³, 1.5× usual Ayase, 4 August: 34.8 µg/m³, 3.3× usual Ayase, 5 August: 22.8 µg/m³, 2.2× usual Ayase, 6 August: 22.3 µg/m³, 2.1× usual Ayase, 7 August: 19.7 µg/m³, 1.9× usual Ayase, 8 August: 15.1 µg/m³, 1.4× usual Iwata Iwata, 1 August: 23.4 µg/m³, 2.5× usual Iwata, 2 August: 15.8 µg/m³, 1.7× usual Iwata, 3 August: 11.9 µg/m³, 1.3× usual Iwata, 4 August: 33.9 µg/m³, 3.6× usual Iwata, 5 August: 13.1 µg/m³, 1.4× usual Iwata, 6 August: 18.1 µg/m³, 1.9× usual Iwata, 7 August: 12.6 µg/m³, 1.3× usual Iwata, 8 August: 7.8 µg/m³, 0.8× usual Chigasaki Chigasaki, 1 August: 7.7 µg/m³, 0.8× usual Chigasaki, 2 August: 10.8 µg/m³, 1.2× usual Chigasaki, 3 August: 15.5 µg/m³, 1.7× usual Chigasaki, 4 August: 32.6 µg/m³, 3.5× usual Chigasaki, 5 August: 21.7 µg/m³, 2.4× usual Chigasaki, 6 August: 19.8 µg/m³, 2.2× usual Chigasaki, 7 August: 18.0 µg/m³, 2.0× usual Chigasaki, 8 August: 15.3 µg/m³, 1.7× usual Fukuroi Fukuroi, 1 August: 18.3 µg/m³, 1.9× usual Fukuroi, 2 August: 18.8 µg/m³, 1.9× usual Fukuroi, 3 August: 15.9 µg/m³, 1.6× usual Fukuroi, 4 August: 32.1 µg/m³, 3.3× usual Fukuroi, 5 August: 11.0 µg/m³, 1.1× usual Fukuroi, 6 August: 17.6 µg/m³, 1.8× usual Fukuroi, 7 August: 12.6 µg/m³, 1.3× usual Fukuroi, 8 August: 7.6 µg/m³, 0.8× usual Gotemba Gotemba, 1 August: 2.0 µg/m³, 0.2× usual Gotemba, 2 August: 18.8 µg/m³, 2.0× usual Gotemba, 3 August: 18.1 µg/m³, 1.9× usual Gotemba, 4 August: 31.8 µg/m³, 3.3× usual Gotemba, 5 August: 12.7 µg/m³, 1.3× usual Gotemba, 6 August: 16.7 µg/m³, 1.7× usual Gotemba, 7 August: 14.7 µg/m³, 1.5× usual Gotemba, 8 August: 10.7 µg/m³, 1.1× usual Odawara Odawara, 1 August: 4.7 µg/m³, 0.5× usual Odawara, 2 August: 11.8 µg/m³, 1.3× usual Odawara, 3 August: 16.7 µg/m³, 1.9× usual Odawara, 4 August: 31.3 µg/m³, 3.6× usual Odawara, 5 August: 17.1 µg/m³, 1.9× usual Odawara, 6 August: 15.6 µg/m³, 1.8× usual Odawara, 7 August: 15.3 µg/m³, 1.7× usual Odawara, 8 August: 11.2 µg/m³, 1.3× usual Kosai Kosai, 1 August: 16.4 µg/m³, 2.0× usual Kosai, 2 August: 15.2 µg/m³, 1.9× usual Kosai, 3 August: 16.9 µg/m³, 2.1× usual Kosai, 4 August: 30.9 µg/m³, 3.8× usual Kosai, 5 August: 13.6 µg/m³, 1.7× usual Kosai, 6 August: 17.0 µg/m³, 2.1× usual Kosai, 7 August: 15.9 µg/m³, 2.0× usual Kosai, 8 August: 10.0 µg/m³, 1.2× usual Shimoda Shimoda, 1 August: 5.0 µg/m³, 0.7× usual Shimoda, 2 August: 13.1 µg/m³, 1.8× usual Shimoda, 3 August: 11.8 µg/m³, 1.6× usual Shimoda, 4 August: 30.3 µg/m³, 4.2× usual Shimoda, 5 August: 8.0 µg/m³, 1.1× usual Shimoda, 6 August: 16.5 µg/m³, 2.3× usual Shimoda, 7 August: 16.0 µg/m³, 2.2× usual Shimoda, 8 August: 9.6 µg/m³, 1.3× usual Atami Atami, 1 August: 6.5 µg/m³, 0.8× usual Atami, 2 August: 13.6 µg/m³, 1.6× usual Atami, 3 August: 14.6 µg/m³, 1.7× usual Atami, 4 August: 30.1 µg/m³, 3.5× usual Atami, 5 August: 15.3 µg/m³, 1.8× usual Atami, 6 August: 16.0 µg/m³, 1.9× usual Atami, 7 August: 15.4 µg/m³, 1.8× usual Atami, 8 August: 10.7 µg/m³, 1.3× usual Hadano Hadano, 1 August: 5.3 µg/m³, 0.6× usual Hadano, 2 August: 10.5 µg/m³, 1.2× usual Hadano, 3 August: 15.1 µg/m³, 1.7× usual Hadano, 4 August: 29.6 µg/m³, 3.3× usual Hadano, 5 August: 18.0 µg/m³, 2.0× usual Hadano, 6 August: 17.7 µg/m³, 2.0× usual Hadano, 7 August: 14.5 µg/m³, 1.6× usual Hadano, 8 August: 12.3 µg/m³, 1.4× usual Fujinomiya Fujinomiya, 1 August: 6.1 µg/m³, 0.7× usual Fujinomiya, 2 August: 12.3 µg/m³, 1.4× usual Fujinomiya, 3 August: 15.2 µg/m³, 1.7× usual Fujinomiya, 4 August: 29.5 µg/m³, 3.2× usual Fujinomiya, 5 August: 17.7 µg/m³, 1.9× usual Fujinomiya, 6 August: 14.7 µg/m³, 1.6× usual Fujinomiya, 7 August: 15.4 µg/m³, 1.7× usual Fujinomiya, 8 August: 8.8 µg/m³, 1.0× usual Minamirinkan Minamirinkan, 1 August: 6.1 µg/m³, 0.6× usual Minamirinkan, 2 August: 11.8 µg/m³, 1.2× usual Minamirinkan, 3 August: 14.1 µg/m³, 1.5× usual Minamirinkan, 4 August: 29.5 µg/m³, 3.0× usual Minamirinkan, 5 August: no reading Minamirinkan, 6 August: no reading Minamirinkan, 7 August: 14.1 µg/m³, 1.5× usual Minamirinkan, 8 August: 13.4 µg/m³, 1.4× usual Tahara Tahara, 1 August: 16.5 µg/m³, 1.7× usual Tahara, 2 August: 15.0 µg/m³, 1.5× usual Tahara, 3 August: 16.6 µg/m³, 1.7× usual Tahara, 4 August: 29.4 µg/m³, 2.9× usual Tahara, 5 August: 15.0 µg/m³, 1.5× usual Tahara, 6 August: no reading Tahara, 7 August: no reading Tahara, 8 August: no reading Aihara Aihara, 1 August: 6.4 µg/m³, 0.6× usual Aihara, 2 August: 11.5 µg/m³, 1.1× usual Aihara, 3 August: 17.1 µg/m³, 1.6× usual Aihara, 4 August: 27.4 µg/m³, 2.5× usual Aihara, 5 August: 29.4 µg/m³, 2.7× usual Aihara, 6 August: 21.1 µg/m³, 1.9× usual Aihara, 7 August: 14.3 µg/m³, 1.3× usual Aihara, 8 August: 11.8 µg/m³, 1.1× usual Gamagōri Gamagōri, 1 August: 14.3 µg/m³, 1.7× usual Gamagōri, 2 August: 14.1 µg/m³, 1.7× usual Gamagōri, 3 August: 16.3 µg/m³, 2.0× usual Gamagōri, 4 August: 29.1 µg/m³, 3.5× usual Gamagōri, 5 August: 18.2 µg/m³, 2.2× usual Gamagōri, 6 August: 12.5 µg/m³, 1.5× usual Gamagōri, 7 August: 11.8 µg/m³, 1.4× usual Gamagōri, 8 August: 9.0 µg/m³, 1.1× usual Kikugawa Kikugawa, 1 August: 13.5 µg/m³, 1.9× usual Kikugawa, 2 August: 14.0 µg/m³, 1.9× usual Kikugawa, 3 August: 13.7 µg/m³, 1.9× usual Kikugawa, 4 August: 29.0 µg/m³, 4.0× usual Kikugawa, 5 August: 9.1 µg/m³, 1.3× usual Kikugawa, 6 August: 16.7 µg/m³, 2.3× usual Kikugawa, 7 August: 16.3 µg/m³, 2.3× usual Kikugawa, 8 August: 10.2 µg/m³, 1.4× usual Mima Mima, 1 August: 18.6 µg/m³, 1.7× usual Mima, 2 August: 18.2 µg/m³, 1.6× usual Mima, 3 August: 17.2 µg/m³, 1.5× usual Mima, 4 August: 28.8 µg/m³, 2.6× usual Mima, 5 August: 17.9 µg/m³, 1.6× usual Mima, 6 August: 16.2 µg/m³, 1.4× usual Mima, 7 August: 11.3 µg/m³, 1.0× usual Mima, 8 August: 14.9 µg/m³, 1.3× usual Kodaira Kodaira, 1 August: 5.8 µg/m³, 0.6× usual Kodaira, 2 August: 9.5 µg/m³, 1.0× usual Kodaira, 3 August: 13.8 µg/m³, 1.5× usual Kodaira, 4 August: 26.7 µg/m³, 2.9× usual Kodaira, 5 August: 28.8 µg/m³, 3.1× usual Kodaira, 6 August: 20.7 µg/m³, 2.2× usual Kodaira, 7 August: 10.5 µg/m³, 1.1× usual Kodaira, 8 August: 10.5 µg/m³, 1.1× usual Hiratsuka Hiratsuka, 1 August: 6.1 µg/m³, 0.7× usual Hiratsuka, 2 August: 8.3 µg/m³, 1.0× usual Hiratsuka, 3 August: 13.9 µg/m³, 1.7× usual Hiratsuka, 4 August: 28.5 µg/m³, 3.4× usual Hiratsuka, 5 August: 16.8 µg/m³, 2.0× usual Hiratsuka, 6 August: 16.2 µg/m³, 1.9× usual Hiratsuka, 7 August: 14.0 µg/m³, 1.7× usual Hiratsuka, 8 August: 12.6 µg/m³, 1.5× usual Hamamatsu Hamamatsu, 1 August: 14.5 µg/m³, 1.9× usual Hamamatsu, 2 August: 14.3 µg/m³, 1.9× usual Hamamatsu, 3 August: 14.5 µg/m³, 1.9× usual Hamamatsu, 4 August: 28.4 µg/m³, 3.8× usual Hamamatsu, 5 August: 9.8 µg/m³, 1.3× usual Hamamatsu, 6 August: 16.2 µg/m³, 2.2× usual Hamamatsu, 7 August: 16.1 µg/m³, 2.1× usual Hamamatsu, 8 August: 9.6 µg/m³, 1.3× usual Tsuchiura Tsuchiura, 1 August: 7.4 µg/m³, 0.7× usual Tsuchiura, 2 August: 10.1 µg/m³, 0.9× usual Tsuchiura, 3 August: 15.4 µg/m³, 1.4× usual Tsuchiura, 4 August: 28.2 µg/m³, 2.5× usual Tsuchiura, 5 August: 28.3 µg/m³, 2.5× usual Tsuchiura, 6 August: 22.3 µg/m³, 2.0× usual Tsuchiura, 7 August: 12.5 µg/m³, 1.1× usual Tsuchiura, 8 August: 16.2 µg/m³, 1.4× usual Ōme Ōme, 1 August: 5.5 µg/m³, 0.5× usual Ōme, 2 August: 9.1 µg/m³, 0.8× usual Ōme, 3 August: 17.0 µg/m³, 1.6× usual Ōme, 4 August: 25.0 µg/m³, 2.3× usual Ōme, 5 August: 28.3 µg/m³, 2.6× usual Ōme, 6 August: 17.9 µg/m³, 1.6× usual Ōme, 7 August: 11.5 µg/m³, 1.1× usual Ōme, 8 August: 8.1 µg/m³, 0.7× usual Kurihama Kurihama, 1 August: 5.8 µg/m³, 0.8× usual Kurihama, 2 August: 7.9 µg/m³, 1.1× usual Kurihama, 3 August: 10.7 µg/m³, 1.5× usual Kurihama, 4 August: 28.1 µg/m³, 4.0× usual Kurihama, 5 August: 12.8 µg/m³, 1.8× usual Kurihama, 6 August: 16.2 µg/m³, 2.3× usual Kurihama, 7 August: 18.4 µg/m³, 2.6× usual Kurihama, 8 August: 12.1 µg/m³, 1.7× usual Chiba Chiba, 1 August: 3.9 µg/m³, 0.5× usual Chiba, 2 August: 9.0 µg/m³, 1.2× usual Chiba, 3 August: 8.5 µg/m³, 1.1× usual Chiba, 4 August: 28.1 µg/m³, 3.6× usual Chiba, 5 August: 16.0 µg/m³, 2.1× usual Chiba, 6 August: 22.0 µg/m³, 2.8× usual Chiba, 7 August: 18.2 µg/m³, 2.3× usual Chiba, 8 August: 11.3 µg/m³, 1.4× usual Higashikurume Higashikurume, 1 August: 5.4 µg/m³, 0.6× usual Higashikurume, 2 August: 8.5 µg/m³, 0.9× usual Higashikurume, 3 August: 12.2 µg/m³, 1.3× usual Higashikurume, 4 August: 25.0 µg/m³, 2.7× usual Higashikurume, 5 August: 28.1 µg/m³, 3.1× usual Higashikurume, 6 August: 18.9 µg/m³, 2.1× usual Higashikurume, 7 August: 9.5 µg/m³, 1.0× usual Higashikurume, 8 August: 10.1 µg/m³, 1.1× usual Shimada Shimada, 1 August: 10.0 µg/m³, 1.3× usual Shimada, 2 August: 12.2 µg/m³, 1.6× usual Shimada, 3 August: 14.5 µg/m³, 1.9× usual Shimada, 4 August: 28.0 µg/m³, 3.6× usual Shimada, 5 August: 11.7 µg/m³, 1.5× usual Shimada, 6 August: 15.0 µg/m³, 1.9× usual Shimada, 7 August: 15.2 µg/m³, 2.0× usual Shimada, 8 August: 9.2 µg/m³, 1.2× usual Toyota Toyota, 1 August: 14.2 µg/m³, 1.7× usual Toyota, 2 August: 14.5 µg/m³, 1.7× usual Toyota, 3 August: 16.1 µg/m³, 1.9× usual Toyota, 4 August: 28.0 µg/m³, 3.3× usual Toyota, 5 August: 21.2 µg/m³, 2.5× usual Toyota, 6 August: 10.3 µg/m³, 1.2× usual Toyota, 7 August: 9.2 µg/m³, 1.1× usual Toyota, 8 August: 8.4 µg/m³, 1.0× usual Anan Anan, 1 August: 22.2 µg/m³, 2.4× usual Anan, 2 August: 20.0 µg/m³, 2.1× usual Anan, 3 August: 18.7 µg/m³, 2.0× usual Anan, 4 August: 28.0 µg/m³, 3.0× usual Anan, 5 August: 15.0 µg/m³, 1.6× usual Anan, 6 August: 24.5 µg/m³, 2.6× usual Anan, 7 August: 16.3 µg/m³, 1.7× usual Anan, 8 August: 14.9 µg/m³, 1.6× usual Yamanashi Yamanashi, 1 August: no reading Yamanashi, 2 August: no reading Yamanashi, 3 August: no reading Yamanashi, 4 August: 24.0 µg/m³, 1.8× usual Yamanashi, 5 August: 44.0 µg/m³, 3.3× usual Yamanashi, 6 August: no reading Yamanashi, 7 August: no reading Yamanashi, 8 August: no reading Kofu Kofu, 1 August: 12.9 µg/m³, 1.1× usual Kofu, 2 August: 13.1 µg/m³, 1.1× usual Kofu, 3 August: 16.7 µg/m³, 1.5× usual Kofu, 4 August: 23.4 µg/m³, 2.0× usual Kofu, 5 August: 34.4 µg/m³, 3.0× usual Kofu, 6 August: 18.3 µg/m³, 1.6× usual Kofu, 7 August: 12.4 µg/m³, 1.1× usual Kofu, 8 August: 9.7 µg/m³, 0.8× usual Kanuma Kanuma, 1 August: 5.2 µg/m³, 0.6× usual Kanuma, 2 August: 4.8 µg/m³, 0.6× usual Kanuma, 3 August: 9.2 µg/m³, 1.1× usual Kanuma, 4 August: 19.5 µg/m³, 2.2× usual Kanuma, 5 August: 31.9 µg/m³, 3.7× usual Kanuma, 6 August: 15.0 µg/m³, 1.7× usual Kanuma, 7 August: 5.9 µg/m³, 0.7× usual Kanuma, 8 August: 6.2 µg/m³, 0.7× usual Oyama Oyama, 1 August: 6.0 µg/m³, 0.6× usual Oyama, 2 August: 7.1 µg/m³, 0.7× usual Oyama, 3 August: 13.5 µg/m³, 1.4× usual Oyama, 4 August: 21.3 µg/m³, 2.2× usual Oyama, 5 August: 31.9 µg/m³, 3.3× usual Oyama, 6 August: 16.8 µg/m³, 1.7× usual Oyama, 7 August: 7.0 µg/m³, 0.7× usual Oyama, 8 August: 9.2 µg/m³, 0.9× usual Sano Sano, 1 August: 6.0 µg/m³, 0.6× usual Sano, 2 August: 7.8 µg/m³, 0.7× usual Sano, 3 August: 13.0 µg/m³, 1.2× usual Sano, 4 August: 20.7 µg/m³, 2.0× usual Sano, 5 August: 31.5 µg/m³, 3.0× usual Sano, 6 August: 16.5 µg/m³, 1.6× usual Sano, 7 August: 8.8 µg/m³, 0.8× usual Sano, 8 August: 8.9 µg/m³, 0.8× usual Tatebayashi Tatebayashi, 1 August: 5.9 µg/m³, 0.6× usual Tatebayashi, 2 August: 8.2 µg/m³, 0.9× usual Tatebayashi, 3 August: no reading Tatebayashi, 4 August: 20.1 µg/m³, 2.1× usual Tatebayashi, 5 August: 31.2 µg/m³, 3.3× usual Tatebayashi, 6 August: 16.7 µg/m³, 1.8× usual Tatebayashi, 7 August: 8.1 µg/m³, 0.9× usual Tatebayashi, 8 August: 8.1 µg/m³, 0.9× usual Kōnosu Kōnosu, 1 August: 5.8 µg/m³, 0.7× usual Kōnosu, 2 August: 9.2 µg/m³, 1.0× usual Kōnosu, 3 August: 12.4 µg/m³, 1.4× usual Kōnosu, 4 August: 21.6 µg/m³, 2.5× usual Kōnosu, 5 August: 31.0 µg/m³, 3.5× usual Kōnosu, 6 August: 16.3 µg/m³, 1.9× usual Kōnosu, 7 August: 6.7 µg/m³, 0.8× usual Kōnosu, 8 August: 7.1 µg/m³, 0.8× usual Chikusei Chikusei, 1 August: 4.9 µg/m³, 0.5× usual Chikusei, 2 August: 6.4 µg/m³, 0.6× usual Chikusei, 3 August: 14.5 µg/m³, 1.5× usual Chikusei, 4 August: 22.2 µg/m³, 2.2× usual Chikusei, 5 August: 30.8 µg/m³, 3.1× usual Chikusei, 6 August: 15.6 µg/m³, 1.6× usual Chikusei, 7 August: 6.6 µg/m³, 0.7× usual Chikusei, 8 August: 9.2 µg/m³, 0.9× usual Ageo Ageo, 1 August: 6.6 µg/m³, 0.7× usual Ageo, 2 August: 8.6 µg/m³, 0.9× usual Ageo, 3 August: 12.3 µg/m³, 1.4× usual Ageo, 4 August: 22.9 µg/m³, 2.5× usual Ageo, 5 August: 30.7 µg/m³, 3.4× usual Ageo, 6 August: 18.0 µg/m³, 2.0× usual Ageo, 7 August: 8.2 µg/m³, 0.9× usual Ageo, 8 August: 8.1 µg/m³, 0.9× usual Nasukarasuyama Nasukarasuyama, 1 August: 4.2 µg/m³, 0.5× usual Nasukarasuyama, 2 August: 3.2 µg/m³, 0.4× usual Nasukarasuyama, 3 August: 8.6 µg/m³, 1.0× usual Nasukarasuyama, 4 August: 18.3 µg/m³, 2.2× usual Nasukarasuyama, 5 August: 30.5 µg/m³, 3.6× usual Nasukarasuyama, 6 August: 11.2 µg/m³, 1.3× usual Nasukarasuyama, 7 August: 5.1 µg/m³, 0.6× usual Nasukarasuyama, 8 August: 5.6 µg/m³, 0.7× usual Mito Mito, 1 August: 4.4 µg/m³, 0.4× usual Mito, 2 August: 4.2 µg/m³, 0.4× usual Mito, 3 August: 9.1 µg/m³, 0.9× usual Mito, 4 August: 20.4 µg/m³, 2.0× usual Mito, 5 August: 30.3 µg/m³, 3.0× usual Mito, 6 August: 13.9 µg/m³, 1.4× usual Mito, 7 August: 5.6 µg/m³, 0.6× usual Mito, 8 August: 7.2 µg/m³, 0.7× usual Kasama Kasama, 1 August: 3.6 µg/m³, 0.4× usual Kasama, 2 August: 3.1 µg/m³, 0.4× usual Kasama, 3 August: 11.8 µg/m³, 1.5× usual Kasama, 4 August: 20.9 µg/m³, 2.6× usual Kasama, 5 August: 30.0 µg/m³, 3.7× usual Kasama, 6 August: 15.0 µg/m³, 1.9× usual Kasama, 7 August: 7.3 µg/m³, 0.9× usual Kasama, 8 August: 8.9 µg/m³, 1.1× usual Minami-Alps Minami-Alps, 1 August: 6.4 µg/m³, 0.7× usual Minami-Alps, 2 August: 8.5 µg/m³, 1.0× usual Minami-Alps, 3 August: 12.7 µg/m³, 1.4× usual Minami-Alps, 4 August: 24.7 µg/m³, 2.8× usual Minami-Alps, 5 August: 30.0 µg/m³, 3.4× usual Minami-Alps, 6 August: 11.7 µg/m³, 1.3× usual Minami-Alps, 7 August: 14.7 µg/m³, 1.7× usual Minami-Alps, 8 August: 8.8 µg/m³, 1.0× usual Gyōda Gyōda, 1 August: 7.0 µg/m³, 0.7× usual Gyōda, 2 August: 9.5 µg/m³, 0.9× usual Gyōda, 3 August: 13.7 µg/m³, 1.4× usual Gyōda, 4 August: 20.4 µg/m³, 2.0× usual Gyōda, 5 August: 30.0 µg/m³, 3.0× usual Gyōda, 6 August: 16.4 µg/m³, 1.6× usual Gyōda, 7 August: 8.3 µg/m³, 0.8× usual Gyōda, 8 August: 8.0 µg/m³, 0.8× usual Iwaki Iwaki, 1 August: 7.0 µg/m³, 0.7× usual Iwaki, 2 August: 6.5 µg/m³, 0.7× usual Iwaki, 3 August: 9.9 µg/m³, 1.0× usual Iwaki, 4 August: 20.4 µg/m³, 2.1× usual Iwaki, 5 August: 29.9 µg/m³, 3.1× usual Iwaki, 6 August: 14.5 µg/m³, 1.5× usual Iwaki, 7 August: 8.2 µg/m³, 0.8× usual Iwaki, 8 August: 6.7 µg/m³, 0.7× usual Bandō Bandō, 1 August: 5.7 µg/m³, 0.7× usual Bandō, 2 August: 8.8 µg/m³, 1.1× usual Bandō, 3 August: 12.6 µg/m³, 1.5× usual Bandō, 4 August: 21.1 µg/m³, 2.5× usual Bandō, 5 August: 29.6 µg/m³, 3.6× usual Bandō, 6 August: 15.9 µg/m³, 1.9× usual Bandō, 7 August: 6.8 µg/m³, 0.8× usual Bandō, 8 August: 7.1 µg/m³, 0.9× usual Hitachi Hitachi, 1 August: 5.0 µg/m³, 0.6× usual Hitachi, 2 August: 6.3 µg/m³, 0.8× usual Hitachi, 3 August: 9.9 µg/m³, 1.3× usual Hitachi, 4 August: 16.1 µg/m³, 2.1× usual Hitachi, 5 August: 29.0 µg/m³, 3.8× usual Hitachi, 6 August: 15.0 µg/m³, 1.9× usual Hitachi, 7 August: 7.2 µg/m³, 0.9× usual Hitachi, 8 August: 7.3 µg/m³, 0.9× usual Hitachi-Naka Hitachi-Naka, 1 August: 5.2 µg/m³, 0.7× usual Hitachi-Naka, 2 August: 4.1 µg/m³, 0.5× usual Hitachi-Naka, 3 August: 10.4 µg/m³, 1.3× usual Hitachi-Naka, 4 August: 19.5 µg/m³, 2.5× usual Hitachi-Naka, 5 August: 29.0 µg/m³, 3.7× usual Hitachi-Naka, 6 August: 15.5 µg/m³, 2.0× usual Hitachi-Naka, 7 August: 5.6 µg/m³, 0.7× usual Hitachi-Naka, 8 August: 8.1 µg/m³, 1.0× usual Higashi-Matsuyama Higashi-Matsuyama, 1 August: 6.0 µg/m³, 0.7× usual Higashi-Matsuyama, 2 August: 8.3 µg/m³, 0.9× usual Higashi-Matsuyama, 3 August: 12.7 µg/m³, 1.4× usual Higashi-Matsuyama, 4 August: 21.3 µg/m³, 2.3× usual Higashi-Matsuyama, 5 August: 29.0 µg/m³, 3.2× usual Higashi-Matsuyama, 6 August: 16.0 µg/m³, 1.8× usual Higashi-Matsuyama, 7 August: 8.4 µg/m³, 0.9× usual Higashi-Matsuyama, 8 August: 6.7 µg/m³, 0.7× usual Hachiōji Hachiōji, 1 August: 6.0 µg/m³, 0.6× usual Hachiōji, 2 August: 9.6 µg/m³, 0.9× usual Hachiōji, 3 August: 15.3 µg/m³, 1.5× usual Hachiōji, 4 August: 24.8 µg/m³, 2.4× usual Hachiōji, 5 August: 28.9 µg/m³, 2.8× usual Hachiōji, 6 August: 20.1 µg/m³, 2.0× usual Hachiōji, 7 August: 13.5 µg/m³, 1.3× usual Hachiōji, 8 August: 11.0 µg/m³, 1.1× usual Kiryū Kiryū, 1 August: 12.9 µg/m³, 1.2× usual Kiryū, 2 August: 6.4 µg/m³, 0.6× usual Kiryū, 3 August: no reading Kiryū, 4 August: 19.1 µg/m³, 1.8× usual Kiryū, 5 August: 28.8 µg/m³, 2.8× usual Kiryū, 6 August: 17.5 µg/m³, 1.7× usual Kiryū, 7 August: 8.5 µg/m³, 0.8× usual Kiryū, 8 August: 7.2 µg/m³, 0.7× usual Yaita Yaita, 1 August: 5.1 µg/m³, 0.5× usual Yaita, 2 August: 3.8 µg/m³, 0.4× usual Yaita, 3 August: 8.9 µg/m³, 0.9× usual Yaita, 4 August: 20.5 µg/m³, 2.1× usual Yaita, 5 August: 28.7 µg/m³, 2.9× usual Yaita, 6 August: 11.6 µg/m³, 1.2× usual Yaita, 7 August: 6.5 µg/m³, 0.7× usual Yaita, 8 August: 6.2 µg/m³, 0.6× usual Kaminokawa Kaminokawa, 1 August: 4.8 µg/m³, 0.6× usual Kaminokawa, 2 August: 4.9 µg/m³, 0.6× usual Kaminokawa, 3 August: 10.1 µg/m³, 1.2× usual Kaminokawa, 4 August: 18.3 µg/m³, 2.1× usual Kaminokawa, 5 August: 28.6 µg/m³, 3.3× usual Kaminokawa, 6 August: 12.0 µg/m³, 1.4× usual Kaminokawa, 7 August: 5.9 µg/m³, 0.7× usual Kaminokawa, 8 August: 6.6 µg/m³, 0.8× usual Ashikaga Ashikaga, 1 August: 4.9 µg/m³, 0.5× usual Ashikaga, 2 August: no reading Ashikaga, 3 August: 10.1 µg/m³, 1.1× usual Ashikaga, 4 August: 16.1 µg/m³, 1.8× usual Ashikaga, 5 August: 28.5 µg/m³, 3.1× usual Ashikaga, 6 August: 16.9 µg/m³, 1.8× usual Ashikaga, 7 August: 9.1 µg/m³, 1.0× usual Ashikaga, 8 August: 7.0 µg/m³, 0.8× usual Akishima Akishima, 1 August: 6.6 µg/m³, 0.7× usual Akishima, 2 August: 9.7 µg/m³, 1.0× usual Akishima, 3 August: 16.4 µg/m³, 1.7× usual Akishima, 4 August: 24.1 µg/m³, 2.5× usual Akishima, 5 August: 28.4 µg/m³, 3.0× usual Akishima, 6 August: 19.4 µg/m³, 2.0× usual Akishima, 7 August: 11.2 µg/m³, 1.2× usual Akishima, 8 August: 10.0 µg/m³, 1.0× usual Kukichūō Kukichūō, 1 August: 5.5 µg/m³, 0.7× usual Kukichūō, 2 August: 7.6 µg/m³, 0.9× usual Kukichūō, 3 August: 11.5 µg/m³, 1.4× usual Kukichūō, 4 August: 19.1 µg/m³, 2.3× usual Kukichūō, 5 August: 28.2 µg/m³, 3.4× usual Kukichūō, 6 August: 14.4 µg/m³, 1.8× usual Kukichūō, 7 August: 7.0 µg/m³, 0.9× usual Kukichūō, 8 August: 8.2 µg/m³, 1.0× usual Menuma Menuma, 1 August: 6.7 µg/m³, 0.7× usual Menuma, 2 August: 8.4 µg/m³, 0.9× usual Menuma, 3 August: 13.7 µg/m³, 1.5× usual Menuma, 4 August: 19.9 µg/m³, 2.1× usual Menuma, 5 August: 28.2 µg/m³, 3.0× usual Menuma, 6 August: 17.1 µg/m³, 1.8× usual Menuma, 7 August: 8.0 µg/m³, 0.9× usual Menuma, 8 August: 7.2 µg/m³, 0.8× usual Mooka Mooka, 1 August: 4.6 µg/m³, 0.5× usual Mooka, 2 August: 4.0 µg/m³, 0.5× usual Mooka, 3 August: 10.5 µg/m³, 1.2× usual Mooka, 4 August: 19.9 µg/m³, 2.3× usual Mooka, 5 August: 27.9 µg/m³, 3.3× usual Mooka, 6 August: 14.1 µg/m³, 1.7× usual Mooka, 7 August: 6.0 µg/m³, 0.7× usual Mooka, 8 August: 6.0 µg/m³, 0.7× usual Ōta Ōta, 1 August: 5.2 µg/m³, 0.7× usual Ōta, 2 August: 7.0 µg/m³, 1.0× usual Ōta, 3 August: no reading Ōta, 4 August: 17.3 µg/m³, 2.4× usual Ōta, 5 August: 27.8 µg/m³, 3.8× usual Ōta, 6 August: 15.5 µg/m³, 2.1× usual Ōta, 7 August: 6.1 µg/m³, 0.8× usual Ōta, 8 August: 6.4 µg/m³, 0.9× usual Hitachiomiya Hitachiomiya, 1 August: 4.1 µg/m³, 0.5× usual Hitachiomiya, 2 August: 4.1 µg/m³, 0.5× usual Hitachiomiya, 3 August: 8.5 µg/m³, 1.1× usual Hitachiomiya, 4 August: 17.7 µg/m³, 2.3× usual Hitachiomiya, 5 August: 27.7 µg/m³, 3.6× usual Hitachiomiya, 6 August: 11.3 µg/m³, 1.4× usual Hitachiomiya, 7 August: 4.1 µg/m³, 0.5× usual Hitachiomiya, 8 August: 5.8 µg/m³, 0.7× usual Kawagoe Kawagoe, 1 August: 5.8 µg/m³, 0.7× usual Kawagoe, 2 August: 9.0 µg/m³, 1.1× usual Kawagoe, 3 August: 12.2 µg/m³, 1.5× usual Kawagoe, 4 August: 22.5 µg/m³, 2.7× usual Kawagoe, 5 August: 27.7 µg/m³, 3.3× usual Kawagoe, 6 August: 17.9 µg/m³, 2.2× usual Kawagoe, 7 August: 8.1 µg/m³, 1.0× usual Kawagoe, 8 August: 7.9 µg/m³, 1.0× usual Tokorozawa Tokorozawa, 1 August: 5.6 µg/m³, 0.6× usual Tokorozawa, 2 August: 9.2 µg/m³, 1.0× usual Tokorozawa, 3 August: 13.7 µg/m³, 1.5× usual Tokorozawa, 4 August: 23.1 µg/m³, 2.5× usual Tokorozawa, 5 August: 27.7 µg/m³, 3.0× usual Tokorozawa, 6 August: 19.0 µg/m³, 2.1× usual Tokorozawa, 7 August: 9.1 µg/m³, 1.0× usual Tokorozawa, 8 August: 10.0 µg/m³, 1.1× usual 1 Aug 2 3 4 5 6 7 8 The 60 cities with the highest readings of 126, 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
Tateyama Chiba, Japan 1 4 August 6.1 4.5× Shimoda Shizuoka, Japan 1 4 August 7.2 4.2× Kikugawa Shizuoka, Japan 1 4 August 7.2 4.0× Shima Mie, Japan 1 4 August 6.8 4.0× Kurihama Kanagawa, Japan 1 4 August 7.0 4.0× Hamakita Shizuoka, Japan 1 4 August 6.9 4.0× Kimitsu Chiba, Japan 1 4 August 6.8 4.0× Kosai Shizuoka, Japan 1 4 August 8.1 3.8× Ōta Gunma, Japan 1 5 August 7.3 3.8× Hamamatsu Shizuoka, Japan 1 4 August 7.5 3.8× Hanyū Saitama, Japan 1 5 August 7.2 3.8× Hitachi Ibaraki, Japan 1 5 August 7.7 3.8× Hitachi-Naka Ibaraki, Japan 1 5 August 7.8 3.7× Miura Kanagawa, Japan 1 4 August 7.3 3.7× Kasama Ibaraki, Japan 1 5 August 8.1 3.7× Yokosuka Kanagawa, Japan 1 4 August 7.1 3.7× Fujieda Shizuoka, Japan 1 4 August 7.1 3.7× Kisarazu Chiba, Japan 1 4 August 6.8 3.7× Kanuma Tochigi, Japan 1 5 August 8.7 3.7× Shimada Shizuoka, Japan 1 4 August 7.7 3.6× Nasukarasuyama Tochigi, Japan 1 5 August 8.4 3.6× Fujisawa Kanagawa, Japan 1 4 August 7.5 3.6× Iwata Shizuoka, Japan 1 4 August 9.4 3.6× Minamibōsō Chiba, Japan 1 4 August 7.1 3.6× Shizuoka Shizuoka, Japan 1 4 August 7.6 3.6× Izunokuni Shizuoka, Japan 1 4 August 7.6 3.6× Chiba Chiba, Japan 1 4 August 7.8 3.6× Urayasu Chiba, Japan 1 4 August 7.1 3.6× Fuji Shizuoka, Japan 1 4 August 7.5 3.6× Shingū Wakayama, Japan 1 4 August 7.2 3.6× Bandō Ibaraki, Japan 1 5 August 8.3 3.6× Odawara Kanagawa, Japan 1 4 August 8.8 3.6× Hitachiomiya Ibaraki, Japan 1 5 August 7.8 3.6× Chigasaki Kanagawa, Japan 1 4 August 9.2 3.5× Atami Shizuoka, Japan 1 4 August 8.5 3.5× Toyohashi Aichi, Japan 1 4 August 7.8 3.5× Kōnosu Saitama, Japan 1 5 August 8.8 3.5× Ebina Kanagawa, Japan 1 4 August 7.4 3.5× Gamagōri Aichi, Japan 1 4 August 8.3 3.5× Numazu Shizuoka, Japan 1 4 August 7.7 3.5× Minamichita Aichi, Japan 1 4 August 7.2 3.5× Kamakura Kanagawa, Japan 1 4 August 7.9 3.5× Kukichūō Saitama, Japan 1 5 August 8.2 3.4× Narashino Chiba, Japan 1 4 August 7.3 3.4× Minami-Alps Yamanashi, Japan 1 5 August 8.8 3.4× Hiratsuka Kanagawa, Japan 1 4 August 8.4 3.4× Tochigi Tochigi, Japan 1 5 August 8.1 3.4× Ageo Saitama, Japan 1 5 August 9.1 3.4× Kumagaya Saitama, Japan 1 5 August 7.8 3.4× Yokohama Kanagawa, Japan 1 4 August 8.0 3.4× Kamagaya Chiba, Japan 1 4 August 7.5 3.3× Toba Mie, Japan 1 4 August 8.1 3.3× Kawagoe Saitama, Japan 1 5 August 8.3 3.3× Minamiashigara Kanagawa, Japan 1 4 August 8.2 3.3× Kaminokawa Tochigi, Japan 1 5 August 8.6 3.3× Noborito Kanagawa, Japan 1 4 August 7.9 3.3× Gotemba Shizuoka, Japan 1 4 August 9.6 3.3× Fukuroi Shizuoka, Japan 1 4 August 9.7 3.3× Toyota Aichi, Japan 1 4 August 8.5 3.3× Hadano Kanagawa, Japan 1 4 August 9.0 3.3× Oyama Tochigi, Japan 1 5 August 9.7 3.3× Tatebayashi Gunma, Japan 1 5 August 9.5 3.3× Yamanashi Yamanashi, Japan 1 5 August 13.4 3.3× Ayase Kanagawa, Japan 1 4 August 10.6 3.3× Mooka Tochigi, Japan 1 5 August 8.5 3.3× Kakegawa Shizuoka, Japan 1 4 August 8.2 3.3× Fujinomiya Shizuoka, Japan 1 4 August 9.1 3.2× Kariya Aichi, Japan 1 4 August 8.3 3.2× Azamino Kanagawa, Japan 1 4 August 8.3 3.2× Machida Tokyo, Japan 1 4 August 8.6 3.2× Yamato Kanagawa, Japan 1 4 August 8.2 3.2× Higashi-Matsuyama Saitama, Japan 1 5 August 9.1 3.2× Anjō Aichi, Japan 1 4 August 8.0 3.2× Kazo Saitama, Japan 1 5 August 8.6 3.2× Ogawamachi Saitama, Japan 1 5 August 8.2 3.1× Kakamigahara Gifu, Japan 1 4 August 8.0 3.1× Utsunomiya Tochigi, Japan 1 5 August 8.5 3.1× Atsugi Kanagawa, Japan 1 4 August 8.8 3.1× Nishio Aichi, Japan 1 4 August 8.1 3.1× Sakai-nakajima Gunma, Japan 1 5 August 8.1 3.1× Kitaibaraki Ibaraki, Japan 1 5 August 8.1 3.1× Ishioka Ibaraki, Japan 1 5 August 8.1 3.1× Ashikaga Tochigi, Japan 1 5 August 9.2 3.1× Kodaira Tokyo, Japan 2 5 August 9.3 3.1× Iwaki Fukushima, Japan 1 5 August 9.7 3.1× Chikusei Ibaraki, Japan 1 5 August 10.0 3.1× Niiza Saitama, Japan 1 5 August 8.7 3.1× Kamojimachō-jōgejima Tokushima, Japan 1 4 August 8.9 3.1× Higashimurayama Tokyo, Japan 1 5 August 9.0 3.1× Higashikurume Tokyo, Japan 2 5 August 9.2 3.1× Iida Nagano, Japan 1 4 August 8.2 3.0× Amagasaki Hyōgo, Japan 1 4 August 8.2 3.0× Minamirinkan Kanagawa, Japan 1 4 August 9.7 3.0× Tokyo Tokyo, Japan 1 4 August 8.4 3.0× Chiryū Aichi, Japan 1 4 August 8.6 3.0× Mito Ibaraki, Japan 1 5 August 10.0 3.0× Tokorozawa Saitama, Japan 1 5 August 9.2 3.0× Okazaki Aichi, Japan 1 4 August 8.7 3.0× Menuma Saitama, Japan 1 5 August 9.4 3.0× Kofu Yamanashi, Japan 1 5 August 11.5 3.0× Anan Tokushima, Japan 1 4 August 9.4 3.0× Tajimi Gifu, Japan 1 4 August 8.7 3.0× Sano Tochigi, Japan 1 5 August 10.6 3.0× Gyōda Saitama, Japan 1 5 August 10.1 3.0× Fuchū Tokyo, Japan 2 4 August 9.1 3.0× Sakado Saitama, Japan 1 5 August 8.9 3.0× Akishima Tokyo, Japan 1 5 August 9.6 3.0× Naka Ibaraki, Japan 1 4 August 8.9 2.9× Tahara Aichi, Japan 1 4 August 10.0 2.9× Yachiyo Chiba, Japan 1 4 August 8.7 2.9× Yaita Tochigi, Japan 1 5 August 9.8 2.9× Igusa Saitama, Japan 1 5 August 9.3 2.9× Ono Hyōgo, Japan 1 4 August 9.0 2.8× Hachiōji Tokyo, Japan 1 5 August 10.2 2.8× Kiryū Gunma, Japan 1 5 August 10.4 2.8× Aihara Kanagawa, Japan 2 5 August 10.9 2.7× Toki Gifu, Japan 2 4 August 10.2 2.7× Morohongō Saitama, Japan 1 5 August 9.9 2.6× Nagahama Shiga, Japan 1 4 August 9.8 2.6× Ōme Tokyo, Japan 2 5 August 10.9 2.6× Mima Tokushima, Japan 1 4 August 11.2 2.6× Iruma Saitama, Japan 1 5 August 10.0 2.6× Minawa Kanagawa, Japan 1 4 August 10.3 2.5× Tottori-shi Tottori, Japan 1 4 August 10.2 2.5× Tsuchiura Ibaraki, Japan 2 5 August 11.2 2.5× Kani Gifu, Japan 1 4 August 9.9 2.5×
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
Number 8 of 27 episodes in Japan 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 Japan, November 2023 131 Japan, August 2025 126 Japan, January and February 2025 110 Japan, May 2025 103 Japan, March 2025 92 Japan and South Korea, April 2025 86 Bars: cities reached; colour: the level of the episode's highest daily reading. All 27 .
Use this page SmogRank, Japan, August 2025: 126 cities with PM2.5 at twice their usual or more, 4 to 5 August 2025, smogrank.com/episodes/2025-08-japan (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.
