SmogRank / Episodes / Japan
Japan, 4 to 5 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 Tottori-shi Minawa Tsuchiura Iruma Nagahama Morohongō Ōme Mima Toki Aihara Ono Kiryū Hachiōji Yachiyo Naka Igusa Yaita Tahara Amagasaki Iida Tokyo Tajimi Chiryū Okazaki Sakado Fuchū Tokorozawa Anan Menuma Akishima Minamirinkan Gyōda Mito Sano Kofu Ishioka Kitaibaraki Kakamigahara Sakai-nakajima Nishio Ogawamachi Utsunomiya Niiza Kamojimachō-jōgejima Atsugi Higashimurayama Higashikurume Ashikaga Kodaira Iwaki Chikusei Anjō Yamato Azamino Kariya Kazo Machida Higashi-Matsuyama Fujinomiya Kamagaya Noborito Kakegawa Toba Minamiashigara Kawagoe Mooka Toyota Kaminokawa Hadano Tatebayashi Gotemba Oyama Fukuroi Ayase Yamanashi Narashino Kumagaya Yokohama Tochigi Kukichūō Hiratsuka Minami-Alps Ageo Minamichita Ebina Numazu Kamakura Toyohashi Gamagōri Atami Kōnosu Chigasaki Urayasu Minamibōsō Shingū Fuji Fujisawa Izunokuni Shizuoka Hitachiomiya Shimada Chiba Bandō Nasukarasuyama Odawara Iwata Kisarazu Fujieda Yokosuka Miura Hitachi-Naka Kasama Kanuma Hanyū Ōta Hamamatsu Hitachi Kosai Kimitsu Shima Hamakita Kurihama Kikugawa 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 Ayase, 2 August: 11.5 µg/m³ Ayase, 3 August: 15.6 µg/m³ Ayase, 4 August: 34.8 µg/m³, 3.3× its usual 10.6 Ayase, 5 August: 22.8 µg/m³ Ayase, 6 August: 22.3 µg/m³ Ayase, 7 August: 19.7 µg/m³ Ayase, 8 August: 15.1 µg/m³ Iwata Iwata, 1 August: 23.4 µg/m³ Iwata, 2 August: 15.8 µg/m³ Iwata, 3 August: 11.9 µg/m³ Iwata, 4 August: 33.9 µg/m³, 3.6× its usual 9.4 Iwata, 5 August: 13.1 µg/m³ Iwata, 6 August: 18.1 µg/m³ Iwata, 7 August: 12.6 µg/m³ Iwata, 8 August: 7.8 µg/m³ Chigasaki Chigasaki, 1 August: 7.7 µg/m³ Chigasaki, 2 August: 10.8 µg/m³ Chigasaki, 3 August: 15.5 µg/m³ Chigasaki, 4 August: 32.6 µg/m³, 3.5× its usual 9.2 Chigasaki, 5 August: 21.7 µg/m³ Chigasaki, 6 August: 19.8 µg/m³ Chigasaki, 7 August: 18.0 µg/m³ Chigasaki, 8 August: 15.3 µg/m³ Fukuroi Fukuroi, 1 August: 18.3 µg/m³ Fukuroi, 2 August: 18.8 µg/m³ Fukuroi, 3 August: 15.9 µg/m³ Fukuroi, 4 August: 32.1 µg/m³, 3.3× its usual 9.7 Fukuroi, 5 August: 11.0 µg/m³ Fukuroi, 6 August: 17.6 µg/m³ Fukuroi, 7 August: 12.6 µg/m³ Fukuroi, 8 August: 7.6 µg/m³ Gotemba Gotemba, 1 August: 2.0 µg/m³ Gotemba, 2 August: 18.8 µg/m³ Gotemba, 3 August: 18.1 µg/m³ Gotemba, 4 August: 31.8 µg/m³, 3.3× its usual 9.6 Gotemba, 5 August: 12.7 µg/m³ Gotemba, 6 August: 16.7 µg/m³ Gotemba, 7 August: 14.7 µg/m³ Gotemba, 8 August: 10.7 µg/m³ Odawara Odawara, 1 August: 4.7 µg/m³ Odawara, 2 August: 11.8 µg/m³ Odawara, 3 August: 16.7 µg/m³ Odawara, 4 August: 31.3 µg/m³, 3.6× its usual 8.8 Odawara, 5 August: 17.1 µg/m³ Odawara, 6 August: 15.6 µg/m³ Odawara, 7 August: 15.3 µg/m³ Odawara, 8 August: 11.2 µg/m³ Kosai Kosai, 1 August: 16.4 µg/m³ Kosai, 2 August: 15.2 µg/m³ Kosai, 3 August: 16.9 µg/m³ Kosai, 4 August: 30.9 µg/m³, 3.8× its usual 8.1 Kosai, 5 August: 13.6 µg/m³ Kosai, 6 August: 17.0 µg/m³ Kosai, 7 August: 15.9 µg/m³ Kosai, 8 August: 10.0 µg/m³ Shimoda Shimoda, 1 August: 5.0 µg/m³ Shimoda, 2 August: 13.1 µg/m³ Shimoda, 3 August: 11.8 µg/m³ Shimoda, 4 August: 30.3 µg/m³, 4.2× its usual 7.2 Shimoda, 5 August: 8.0 µg/m³ Shimoda, 6 August: 16.5 µg/m³ Shimoda, 7 August: 16.0 µg/m³ Shimoda, 8 August: 9.6 µg/m³ Atami Atami, 1 August: 6.5 µg/m³ Atami, 2 August: 13.6 µg/m³ Atami, 3 August: 14.6 µg/m³ Atami, 4 August: 30.1 µg/m³, 3.5× its usual 8.5 Atami, 5 August: 15.3 µg/m³ Atami, 6 August: 16.0 µg/m³ Atami, 7 August: 15.4 µg/m³ Atami, 8 August: 10.7 µg/m³ Hadano Hadano, 1 August: 5.3 µg/m³ Hadano, 2 August: 10.5 µg/m³ Hadano, 3 August: 15.1 µg/m³ Hadano, 4 August: 29.6 µg/m³, 3.3× its usual 9.0 Hadano, 5 August: 18.0 µg/m³ Hadano, 6 August: 17.7 µg/m³ Hadano, 7 August: 14.5 µg/m³ Hadano, 8 August: 12.3 µg/m³ Fujinomiya Fujinomiya, 1 August: 6.1 µg/m³ Fujinomiya, 2 August: 12.3 µg/m³ Fujinomiya, 3 August: 15.2 µg/m³ Fujinomiya, 4 August: 29.5 µg/m³, 3.2× its usual 9.1 Fujinomiya, 5 August: 17.7 µg/m³ Fujinomiya, 6 August: 14.7 µg/m³ Fujinomiya, 7 August: 15.4 µg/m³ Fujinomiya, 8 August: 8.8 µg/m³ Minamirinkan Minamirinkan, 1 August: 6.1 µg/m³ Minamirinkan, 2 August: 11.8 µg/m³ Minamirinkan, 3 August: 14.1 µg/m³ Minamirinkan, 4 August: 29.5 µg/m³, 3.0× its usual 9.7 Minamirinkan, 5 August: no reading Minamirinkan, 6 August: no reading Minamirinkan, 7 August: 14.1 µg/m³ Minamirinkan, 8 August: 13.4 µg/m³ Tahara Tahara, 1 August: 16.5 µg/m³ Tahara, 2 August: 15.0 µg/m³ Tahara, 3 August: 16.6 µg/m³ Tahara, 4 August: 29.4 µg/m³, 2.9× its usual 10.0 Tahara, 5 August: 15.0 µg/m³ Tahara, 6 August: no reading Tahara, 7 August: no reading Tahara, 8 August: no reading Aihara Aihara, 1 August: 6.4 µg/m³ Aihara, 2 August: 11.5 µg/m³ Aihara, 3 August: 17.1 µg/m³ Aihara, 4 August: 27.4 µg/m³, 2.6× its usual 10.7 Aihara, 5 August: 29.4 µg/m³, 2.7× its usual 10.9 Aihara, 6 August: 21.1 µg/m³ Aihara, 7 August: 14.3 µg/m³ Aihara, 8 August: 11.8 µg/m³ Gamagōri Gamagōri, 1 August: 14.3 µg/m³ Gamagōri, 2 August: 14.1 µg/m³ Gamagōri, 3 August: 16.3 µg/m³ Gamagōri, 4 August: 29.1 µg/m³, 3.5× its usual 8.3 Gamagōri, 5 August: 18.2 µg/m³ Gamagōri, 6 August: 12.5 µg/m³ Gamagōri, 7 August: 11.8 µg/m³ Gamagōri, 8 August: 9.0 µg/m³ Kikugawa Kikugawa, 1 August: 13.5 µg/m³ Kikugawa, 2 August: 14.0 µg/m³ Kikugawa, 3 August: 13.7 µg/m³ Kikugawa, 4 August: 29.0 µg/m³, 4.0× its usual 7.2 Kikugawa, 5 August: 9.1 µg/m³ Kikugawa, 6 August: 16.7 µg/m³ Kikugawa, 7 August: 16.3 µg/m³ Kikugawa, 8 August: 10.2 µg/m³ Mima Mima, 1 August: 18.6 µg/m³ Mima, 2 August: 18.2 µg/m³ Mima, 3 August: 17.2 µg/m³ Mima, 4 August: 28.8 µg/m³, 2.6× its usual 11.2 Mima, 5 August: 17.9 µg/m³ Mima, 6 August: 16.2 µg/m³ Mima, 7 August: 11.3 µg/m³ Mima, 8 August: 14.9 µg/m³ Kodaira Kodaira, 1 August: 5.8 µg/m³ Kodaira, 2 August: 9.5 µg/m³ Kodaira, 3 August: 13.8 µg/m³ Kodaira, 4 August: 26.7 µg/m³, 2.9× its usual 9.3 Kodaira, 5 August: 28.8 µg/m³, 3.1× its usual 9.3 Kodaira, 6 August: 20.7 µg/m³ Kodaira, 7 August: 10.5 µg/m³ Kodaira, 8 August: 10.5 µg/m³ Hiratsuka Hiratsuka, 1 August: 6.1 µg/m³ Hiratsuka, 2 August: 8.3 µg/m³ Hiratsuka, 3 August: 13.9 µg/m³ Hiratsuka, 4 August: 28.5 µg/m³, 3.4× its usual 8.4 Hiratsuka, 5 August: 16.8 µg/m³ Hiratsuka, 6 August: 16.2 µg/m³ Hiratsuka, 7 August: 14.0 µg/m³ Hiratsuka, 8 August: 12.6 µg/m³ Hamamatsu Hamamatsu, 1 August: 14.5 µg/m³ Hamamatsu, 2 August: 14.3 µg/m³ Hamamatsu, 3 August: 14.5 µg/m³ Hamamatsu, 4 August: 28.4 µg/m³, 3.8× its usual 7.5 Hamamatsu, 5 August: 9.8 µg/m³ Hamamatsu, 6 August: 16.2 µg/m³ Hamamatsu, 7 August: 16.1 µg/m³ Hamamatsu, 8 August: 9.6 µg/m³ Tsuchiura Tsuchiura, 1 August: 7.4 µg/m³ Tsuchiura, 2 August: 10.1 µg/m³ Tsuchiura, 3 August: 15.4 µg/m³ Tsuchiura, 4 August: 28.2 µg/m³, 2.5× its usual 11.2 Tsuchiura, 5 August: 28.3 µg/m³, 2.5× its usual 11.2 Tsuchiura, 6 August: 22.3 µg/m³ Tsuchiura, 7 August: 12.5 µg/m³ Tsuchiura, 8 August: 16.2 µg/m³ Ōme Ōme, 1 August: 5.5 µg/m³ Ōme, 2 August: 9.1 µg/m³ Ōme, 3 August: 17.0 µg/m³ Ōme, 4 August: 25.0 µg/m³, 2.3× its usual 10.8 Ōme, 5 August: 28.3 µg/m³, 2.6× its usual 10.9 Ōme, 6 August: 17.9 µg/m³ Ōme, 7 August: 11.5 µg/m³ Ōme, 8 August: 8.1 µg/m³ Kurihama Kurihama, 1 August: 5.8 µg/m³ Kurihama, 2 August: 7.9 µg/m³ Kurihama, 3 August: 10.7 µg/m³ Kurihama, 4 August: 28.1 µg/m³, 4.0× its usual 7.0 Kurihama, 5 August: 12.8 µg/m³ Kurihama, 6 August: 16.2 µg/m³ Kurihama, 7 August: 18.4 µg/m³ Kurihama, 8 August: 12.1 µg/m³ Chiba Chiba, 1 August: 3.9 µg/m³ Chiba, 2 August: 9.0 µg/m³ Chiba, 3 August: 8.5 µg/m³ Chiba, 4 August: 28.1 µg/m³, 3.6× its usual 7.8 Chiba, 5 August: 16.0 µg/m³ Chiba, 6 August: 22.0 µg/m³ Chiba, 7 August: 18.2 µg/m³ Chiba, 8 August: 11.3 µg/m³ Higashikurume Higashikurume, 1 August: 5.4 µg/m³ Higashikurume, 2 August: 8.5 µg/m³ Higashikurume, 3 August: 12.2 µg/m³ Higashikurume, 4 August: 25.0 µg/m³, 2.7× its usual 9.1 Higashikurume, 5 August: 28.1 µg/m³, 3.1× its usual 9.2 Higashikurume, 6 August: 18.9 µg/m³ Higashikurume, 7 August: 9.5 µg/m³ Higashikurume, 8 August: 10.1 µg/m³ Shimada Shimada, 1 August: 10.0 µg/m³ Shimada, 2 August: 12.2 µg/m³ Shimada, 3 August: 14.5 µg/m³ Shimada, 4 August: 28.0 µg/m³, 3.6× its usual 7.7 Shimada, 5 August: 11.7 µg/m³ Shimada, 6 August: 15.0 µg/m³ Shimada, 7 August: 15.2 µg/m³ Shimada, 8 August: 9.2 µg/m³ Toyota Toyota, 1 August: 14.2 µg/m³ Toyota, 2 August: 14.5 µg/m³ Toyota, 3 August: 16.1 µg/m³ Toyota, 4 August: 28.0 µg/m³, 3.3× its usual 8.5 Toyota, 5 August: 21.2 µg/m³ Toyota, 6 August: 10.3 µg/m³ Toyota, 7 August: 9.2 µg/m³ Toyota, 8 August: 8.4 µg/m³ Anan Anan, 1 August: 22.2 µg/m³ Anan, 2 August: 20.0 µg/m³ Anan, 3 August: 18.7 µg/m³ Anan, 4 August: 28.0 µg/m³, 3.0× its usual 9.4 Anan, 5 August: 15.0 µg/m³ Anan, 6 August: 24.5 µg/m³ Anan, 7 August: 16.3 µg/m³ Anan, 8 August: 14.9 µg/m³ Yamanashi Yamanashi, 1 August: no reading Yamanashi, 2 August: no reading Yamanashi, 3 August: no reading Yamanashi, 4 August: 24.0 µg/m³ Yamanashi, 5 August: 44.0 µg/m³, 3.3× its usual 13.4 Yamanashi, 6 August: no reading Yamanashi, 7 August: no reading Yamanashi, 8 August: no reading Kofu Kofu, 1 August: 12.9 µg/m³ Kofu, 2 August: 13.1 µg/m³ Kofu, 3 August: 16.7 µg/m³ Kofu, 4 August: 23.4 µg/m³ Kofu, 5 August: 34.4 µg/m³, 3.0× its usual 11.5 Kofu, 6 August: 18.3 µg/m³ Kofu, 7 August: 12.4 µg/m³ Kofu, 8 August: 9.7 µg/m³ Kanuma Kanuma, 1 August: 5.2 µg/m³ Kanuma, 2 August: 4.8 µg/m³ Kanuma, 3 August: 9.2 µg/m³ Kanuma, 4 August: 19.5 µg/m³ Kanuma, 5 August: 31.9 µg/m³, 3.7× its usual 8.7 Kanuma, 6 August: 15.0 µg/m³ Kanuma, 7 August: 5.9 µg/m³ Kanuma, 8 August: 6.2 µg/m³ Oyama Oyama, 1 August: 6.0 µg/m³ Oyama, 2 August: 7.1 µg/m³ Oyama, 3 August: 13.5 µg/m³ Oyama, 4 August: 21.3 µg/m³ Oyama, 5 August: 31.9 µg/m³, 3.3× its usual 9.7 Oyama, 6 August: 16.8 µg/m³ Oyama, 7 August: 7.0 µg/m³ Oyama, 8 August: 9.2 µg/m³ Sano Sano, 1 August: 6.0 µg/m³ Sano, 2 August: 7.8 µg/m³ Sano, 3 August: 13.0 µg/m³ Sano, 4 August: 20.7 µg/m³ Sano, 5 August: 31.5 µg/m³, 3.0× its usual 10.6 Sano, 6 August: 16.5 µg/m³ Sano, 7 August: 8.8 µg/m³ Sano, 8 August: 8.9 µg/m³ Tatebayashi Tatebayashi, 1 August: 5.9 µg/m³ Tatebayashi, 2 August: 8.2 µg/m³ Tatebayashi, 3 August: no reading Tatebayashi, 4 August: 20.1 µg/m³ Tatebayashi, 5 August: 31.2 µg/m³, 3.3× its usual 9.5 Tatebayashi, 6 August: 16.7 µg/m³ Tatebayashi, 7 August: 8.1 µg/m³ Tatebayashi, 8 August: 8.1 µg/m³ Kōnosu Kōnosu, 1 August: 5.8 µg/m³ Kōnosu, 2 August: 9.2 µg/m³ Kōnosu, 3 August: 12.4 µg/m³ Kōnosu, 4 August: 21.6 µg/m³ Kōnosu, 5 August: 31.0 µg/m³, 3.5× its usual 8.8 Kōnosu, 6 August: 16.3 µg/m³ Kōnosu, 7 August: 6.7 µg/m³ Kōnosu, 8 August: 7.1 µg/m³ Chikusei Chikusei, 1 August: 4.9 µg/m³ Chikusei, 2 August: 6.4 µg/m³ Chikusei, 3 August: 14.5 µg/m³ Chikusei, 4 August: 22.2 µg/m³ Chikusei, 5 August: 30.8 µg/m³, 3.1× its usual 10.0 Chikusei, 6 August: 15.6 µg/m³ Chikusei, 7 August: 6.6 µg/m³ Chikusei, 8 August: 9.2 µg/m³ Ageo Ageo, 1 August: 6.6 µg/m³ Ageo, 2 August: 8.6 µg/m³ Ageo, 3 August: 12.3 µg/m³ Ageo, 4 August: 22.9 µg/m³ Ageo, 5 August: 30.7 µg/m³, 3.4× its usual 9.1 Ageo, 6 August: 18.0 µg/m³ Ageo, 7 August: 8.2 µg/m³ Ageo, 8 August: 8.1 µg/m³ Nasukarasuyama Nasukarasuyama, 1 August: 4.2 µg/m³ Nasukarasuyama, 2 August: 3.2 µg/m³ Nasukarasuyama, 3 August: 8.6 µg/m³ Nasukarasuyama, 4 August: 18.3 µg/m³ Nasukarasuyama, 5 August: 30.5 µg/m³, 3.6× its usual 8.4 Nasukarasuyama, 6 August: 11.2 µg/m³ Nasukarasuyama, 7 August: 5.1 µg/m³ Nasukarasuyama, 8 August: 5.6 µg/m³ Mito Mito, 1 August: 4.4 µg/m³ Mito, 2 August: 4.2 µg/m³ Mito, 3 August: 9.1 µg/m³ Mito, 4 August: 20.4 µg/m³ Mito, 5 August: 30.3 µg/m³, 3.0× its usual 10.0 Mito, 6 August: 13.9 µg/m³ Mito, 7 August: 5.6 µg/m³ Mito, 8 August: 7.2 µg/m³ Kasama Kasama, 1 August: 3.6 µg/m³ Kasama, 2 August: 3.1 µg/m³ Kasama, 3 August: 11.8 µg/m³ Kasama, 4 August: 20.9 µg/m³ Kasama, 5 August: 30.0 µg/m³, 3.7× its usual 8.1 Kasama, 6 August: 15.0 µg/m³ Kasama, 7 August: 7.3 µg/m³ Kasama, 8 August: 8.9 µg/m³ Minami-Alps Minami-Alps, 1 August: 6.4 µg/m³ Minami-Alps, 2 August: 8.5 µg/m³ Minami-Alps, 3 August: 12.7 µg/m³ Minami-Alps, 4 August: 24.7 µg/m³ Minami-Alps, 5 August: 30.0 µg/m³, 3.4× its usual 8.8 Minami-Alps, 6 August: 11.7 µg/m³ Minami-Alps, 7 August: 14.7 µg/m³ Minami-Alps, 8 August: 8.8 µg/m³ Gyōda Gyōda, 1 August: 7.0 µg/m³ Gyōda, 2 August: 9.5 µg/m³ Gyōda, 3 August: 13.7 µg/m³ Gyōda, 4 August: 20.4 µg/m³ Gyōda, 5 August: 30.0 µg/m³, 3.0× its usual 10.1 Gyōda, 6 August: 16.4 µg/m³ Gyōda, 7 August: 8.3 µg/m³ Gyōda, 8 August: 8.0 µg/m³ Iwaki Iwaki, 1 August: 7.0 µg/m³ Iwaki, 2 August: 6.5 µg/m³ Iwaki, 3 August: 9.9 µg/m³ Iwaki, 4 August: 20.4 µg/m³ Iwaki, 5 August: 29.9 µg/m³, 3.1× its usual 9.7 Iwaki, 6 August: 14.5 µg/m³ Iwaki, 7 August: 8.2 µg/m³ Iwaki, 8 August: 6.7 µg/m³ Bandō Bandō, 1 August: 5.7 µg/m³ Bandō, 2 August: 8.8 µg/m³ Bandō, 3 August: 12.6 µg/m³ Bandō, 4 August: 21.1 µg/m³ Bandō, 5 August: 29.6 µg/m³, 3.6× its usual 8.3 Bandō, 6 August: 15.9 µg/m³ Bandō, 7 August: 6.8 µg/m³ Bandō, 8 August: 7.1 µg/m³ Hitachi Hitachi, 1 August: 5.0 µg/m³ Hitachi, 2 August: 6.3 µg/m³ Hitachi, 3 August: 9.9 µg/m³ Hitachi, 4 August: 16.1 µg/m³ Hitachi, 5 August: 29.0 µg/m³, 3.8× its usual 7.7 Hitachi, 6 August: 15.0 µg/m³ Hitachi, 7 August: 7.2 µg/m³ Hitachi, 8 August: 7.3 µg/m³ Hitachi-Naka Hitachi-Naka, 1 August: 5.2 µg/m³ Hitachi-Naka, 2 August: 4.1 µg/m³ Hitachi-Naka, 3 August: 10.4 µg/m³ Hitachi-Naka, 4 August: 19.5 µg/m³ Hitachi-Naka, 5 August: 29.0 µg/m³, 3.7× its usual 7.8 Hitachi-Naka, 6 August: 15.5 µg/m³ Hitachi-Naka, 7 August: 5.6 µg/m³ Hitachi-Naka, 8 August: 8.1 µg/m³ Higashi-Matsuyama Higashi-Matsuyama, 1 August: 6.0 µg/m³ Higashi-Matsuyama, 2 August: 8.3 µg/m³ Higashi-Matsuyama, 3 August: 12.7 µg/m³ Higashi-Matsuyama, 4 August: 21.3 µg/m³ Higashi-Matsuyama, 5 August: 29.0 µg/m³, 3.2× its usual 9.1 Higashi-Matsuyama, 6 August: 16.0 µg/m³ Higashi-Matsuyama, 7 August: 8.4 µg/m³ Higashi-Matsuyama, 8 August: 6.7 µg/m³ Hachiōji Hachiōji, 1 August: 6.0 µg/m³ Hachiōji, 2 August: 9.6 µg/m³ Hachiōji, 3 August: 15.3 µg/m³ Hachiōji, 4 August: 24.8 µg/m³ Hachiōji, 5 August: 28.9 µg/m³, 2.8× its usual 10.2 Hachiōji, 6 August: 20.1 µg/m³ Hachiōji, 7 August: 13.5 µg/m³ Hachiōji, 8 August: 11.0 µg/m³ Kiryū Kiryū, 1 August: 12.9 µg/m³ Kiryū, 2 August: 6.4 µg/m³ Kiryū, 3 August: no reading Kiryū, 4 August: 19.1 µg/m³ Kiryū, 5 August: 28.8 µg/m³, 2.8× its usual 10.4 Kiryū, 6 August: 17.5 µg/m³ Kiryū, 7 August: 8.5 µg/m³ Kiryū, 8 August: 7.2 µg/m³ Yaita Yaita, 1 August: 5.1 µg/m³ Yaita, 2 August: 3.8 µg/m³ Yaita, 3 August: 8.9 µg/m³ Yaita, 4 August: 20.5 µg/m³ Yaita, 5 August: 28.7 µg/m³, 2.9× its usual 9.8 Yaita, 6 August: 11.6 µg/m³ Yaita, 7 August: 6.5 µg/m³ Yaita, 8 August: 6.2 µg/m³ Kaminokawa Kaminokawa, 1 August: 4.8 µg/m³ Kaminokawa, 2 August: 4.9 µg/m³ Kaminokawa, 3 August: 10.1 µg/m³ Kaminokawa, 4 August: 18.3 µg/m³ Kaminokawa, 5 August: 28.6 µg/m³, 3.3× its usual 8.6 Kaminokawa, 6 August: 12.0 µg/m³ Kaminokawa, 7 August: 5.9 µg/m³ Kaminokawa, 8 August: 6.6 µg/m³ Ashikaga Ashikaga, 1 August: 4.9 µg/m³ Ashikaga, 2 August: no reading Ashikaga, 3 August: 10.1 µg/m³ Ashikaga, 4 August: 16.1 µg/m³ Ashikaga, 5 August: 28.5 µg/m³, 3.1× its usual 9.2 Ashikaga, 6 August: 16.9 µg/m³ Ashikaga, 7 August: 9.1 µg/m³ Ashikaga, 8 August: 7.0 µg/m³ Akishima Akishima, 1 August: 6.6 µg/m³ Akishima, 2 August: 9.7 µg/m³ Akishima, 3 August: 16.4 µg/m³ Akishima, 4 August: 24.1 µg/m³ Akishima, 5 August: 28.4 µg/m³, 3.0× its usual 9.6 Akishima, 6 August: 19.4 µg/m³ Akishima, 7 August: 11.2 µg/m³ Akishima, 8 August: 10.0 µg/m³ Kukichūō Kukichūō, 1 August: 5.5 µg/m³ Kukichūō, 2 August: 7.6 µg/m³ Kukichūō, 3 August: 11.5 µg/m³ Kukichūō, 4 August: 19.1 µg/m³ Kukichūō, 5 August: 28.2 µg/m³, 3.4× its usual 8.2 Kukichūō, 6 August: 14.4 µg/m³ Kukichūō, 7 August: 7.0 µg/m³ Kukichūō, 8 August: 8.2 µg/m³ Menuma Menuma, 1 August: 6.7 µg/m³ Menuma, 2 August: 8.4 µg/m³ Menuma, 3 August: 13.7 µg/m³ Menuma, 4 August: 19.9 µg/m³ Menuma, 5 August: 28.2 µg/m³, 3.0× its usual 9.4 Menuma, 6 August: 17.1 µg/m³ Menuma, 7 August: 8.0 µg/m³ Menuma, 8 August: 7.2 µg/m³ Mooka Mooka, 1 August: 4.6 µg/m³ Mooka, 2 August: 4.0 µg/m³ Mooka, 3 August: 10.5 µg/m³ Mooka, 4 August: 19.9 µg/m³ Mooka, 5 August: 27.9 µg/m³, 3.3× its usual 8.5 Mooka, 6 August: 14.1 µg/m³ Mooka, 7 August: 6.0 µg/m³ Mooka, 8 August: 6.0 µg/m³ Ōta Ōta, 1 August: 5.2 µg/m³ Ōta, 2 August: 7.0 µg/m³ Ōta, 3 August: no reading Ōta, 4 August: 17.3 µg/m³ Ōta, 5 August: 27.8 µg/m³, 3.8× its usual 7.3 Ōta, 6 August: 15.5 µg/m³ Ōta, 7 August: 6.1 µg/m³ Ōta, 8 August: 6.4 µg/m³ Hitachiomiya Hitachiomiya, 1 August: 4.1 µg/m³ Hitachiomiya, 2 August: 4.1 µg/m³ Hitachiomiya, 3 August: 8.5 µg/m³ Hitachiomiya, 4 August: 17.7 µg/m³ Hitachiomiya, 5 August: 27.7 µg/m³, 3.6× its usual 7.8 Hitachiomiya, 6 August: 11.3 µg/m³ Hitachiomiya, 7 August: 4.1 µg/m³ Hitachiomiya, 8 August: 5.8 µg/m³ Kawagoe Kawagoe, 1 August: 5.8 µg/m³ Kawagoe, 2 August: 9.0 µg/m³ Kawagoe, 3 August: 12.2 µg/m³ Kawagoe, 4 August: 22.5 µg/m³ Kawagoe, 5 August: 27.7 µg/m³, 3.3× its usual 8.3 Kawagoe, 6 August: 17.9 µg/m³ Kawagoe, 7 August: 8.1 µg/m³ Kawagoe, 8 August: 7.9 µg/m³ Tokorozawa Tokorozawa, 1 August: 5.6 µg/m³ Tokorozawa, 2 August: 9.2 µg/m³ Tokorozawa, 3 August: 13.7 µg/m³ Tokorozawa, 4 August: 23.1 µg/m³ Tokorozawa, 5 August: 27.7 µg/m³, 3.0× its usual 9.2 Tokorozawa, 6 August: 19.0 µg/m³ Tokorozawa, 7 August: 9.1 µg/m³ Tokorozawa, 8 August: 10.0 µg/m³ 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× Kurihama Kanagawa, Japan 1 4 August 7.0 4.0× Hamakita Shizuoka, Japan 1 4 August 6.9 4.0× Shima Mie, Japan 1 4 August 6.8 4.0× Kimitsu Chiba, Japan 1 4 August 6.8 4.0× Kosai Shizuoka, Japan 1 4 August 8.1 3.8× Hitachi Ibaraki, Japan 1 5 August 7.7 3.8× Hamamatsu Shizuoka, Japan 1 4 August 7.5 3.8× Ōta Gunma, Japan 1 5 August 7.3 3.8× Hanyū Saitama, Japan 1 5 August 7.2 3.8× Kanuma Tochigi, Japan 1 5 August 8.7 3.7× Kasama Ibaraki, Japan 1 5 August 8.1 3.7× Hitachi-Naka Ibaraki, Japan 1 5 August 7.8 3.7× Miura Kanagawa, Japan 1 4 August 7.3 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× Iwata Shizuoka, Japan 1 4 August 9.4 3.6× Odawara Kanagawa, Japan 1 4 August 8.8 3.6× Nasukarasuyama Tochigi, Japan 1 5 August 8.4 3.6× Bandō Ibaraki, Japan 1 5 August 8.3 3.6× Chiba Chiba, Japan 1 4 August 7.8 3.6× Shimada Shizuoka, Japan 1 4 August 7.7 3.6× Hitachiomiya Ibaraki, Japan 1 5 August 7.8 3.6× Shizuoka Shizuoka, Japan 1 4 August 7.6 3.6× Izunokuni Shizuoka, Japan 1 4 August 7.6 3.6× Fujisawa Kanagawa, Japan 1 4 August 7.5 3.6× Fuji Shizuoka, Japan 1 4 August 7.5 3.6× Shingū Wakayama, Japan 1 4 August 7.2 3.6× Minamibōsō Chiba, Japan 1 4 August 7.1 3.6× Urayasu Chiba, Japan 1 4 August 7.1 3.6× Chigasaki Kanagawa, Japan 1 4 August 9.2 3.5× Kōnosu Saitama, Japan 1 5 August 8.8 3.5× Atami Shizuoka, Japan 1 4 August 8.5 3.5× Gamagōri Aichi, Japan 1 4 August 8.3 3.5× Toyohashi Aichi, Japan 1 4 August 7.8 3.5× Kamakura Kanagawa, Japan 1 4 August 7.9 3.5× Numazu Shizuoka, Japan 1 4 August 7.7 3.5× Ebina Kanagawa, Japan 1 4 August 7.4 3.5× Minamichita Aichi, Japan 1 4 August 7.2 3.5× Ageo Saitama, Japan 1 5 August 9.1 3.4× Minami-Alps Yamanashi, Japan 1 5 August 8.8 3.4× Hiratsuka Kanagawa, Japan 1 4 August 8.4 3.4× Kukichūō Saitama, Japan 1 5 August 8.2 3.4× Tochigi Tochigi, Japan 1 5 August 8.1 3.4× Yokohama Kanagawa, Japan 1 4 August 8.0 3.4× Kumagaya Saitama, Japan 1 5 August 7.8 3.4× Narashino Chiba, Japan 1 4 August 7.3 3.4× Yamanashi Yamanashi, Japan 1 5 August 13.4 3.3× Ayase Kanagawa, Japan 1 4 August 10.6 3.3× Fukuroi Shizuoka, Japan 1 4 August 9.7 3.3× Oyama Tochigi, Japan 1 5 August 9.7 3.3× Gotemba Shizuoka, Japan 1 4 August 9.6 3.3× Tatebayashi Gunma, Japan 1 5 August 9.5 3.3× Hadano Kanagawa, Japan 1 4 August 9.0 3.3× Kaminokawa Tochigi, Japan 1 5 August 8.6 3.3× Toyota Aichi, Japan 1 4 August 8.5 3.3× Mooka Tochigi, Japan 1 5 August 8.5 3.3× Kawagoe Saitama, Japan 1 5 August 8.3 3.3× Minamiashigara Kanagawa, Japan 1 4 August 8.2 3.3× Toba Mie, Japan 1 4 August 8.1 3.3× Kakegawa Shizuoka, Japan 1 4 August 8.2 3.3× Noborito Kanagawa, Japan 1 4 August 7.9 3.3× Kamagaya Chiba, Japan 1 4 August 7.5 3.3× Fujinomiya Shizuoka, Japan 1 4 August 9.1 3.2× Higashi-Matsuyama Saitama, Japan 1 5 August 9.1 3.2× Machida Tokyo, Japan 1 4 August 8.6 3.2× Kazo Saitama, Japan 1 5 August 8.6 3.2× Kariya Aichi, Japan 1 4 August 8.3 3.2× Azamino Kanagawa, Japan 1 4 August 8.3 3.2× Yamato Kanagawa, Japan 1 4 August 8.2 3.2× Anjō Aichi, Japan 1 4 August 8.0 3.2× Chikusei Ibaraki, Japan 1 5 August 10.0 3.1× Iwaki Fukushima, Japan 1 5 August 9.7 3.1× Kodaira Tokyo, Japan 2 5 August 9.3 3.1× Ashikaga Tochigi, Japan 1 5 August 9.2 3.1× Higashikurume Tokyo, Japan 2 5 August 9.2 3.1× Higashimurayama Tokyo, Japan 1 5 August 9.0 3.1× Atsugi Kanagawa, Japan 1 4 August 8.8 3.1× Kamojimachō-jōgejima Tokushima, Japan 1 4 August 8.9 3.1× Niiza Saitama, Japan 1 5 August 8.7 3.1× Utsunomiya Tochigi, Japan 1 5 August 8.5 3.1× Ogawamachi Saitama, Japan 1 5 August 8.2 3.1× Nishio Aichi, Japan 1 4 August 8.1 3.1× Sakai-nakajima Gunma, Japan 1 5 August 8.1 3.1× Kakamigahara Gifu, Japan 1 4 August 8.0 3.1× Kitaibaraki Ibaraki, Japan 1 5 August 8.1 3.1× Ishioka Ibaraki, Japan 1 5 August 8.1 3.1× Kofu Yamanashi, Japan 1 5 August 11.5 3.0× Sano Tochigi, Japan 1 5 August 10.6 3.0× Mito Ibaraki, Japan 1 5 August 10.0 3.0× Gyōda Saitama, Japan 1 5 August 10.1 3.0× Minamirinkan Kanagawa, Japan 1 4 August 9.7 3.0× Akishima Tokyo, Japan 1 5 August 9.6 3.0× Menuma Saitama, Japan 1 5 August 9.4 3.0× Anan Tokushima, Japan 1 4 August 9.4 3.0× Tokorozawa Saitama, Japan 1 5 August 9.2 3.0× Fuchū Tokyo, Japan 2 4 August 9.1 3.0× Sakado Saitama, Japan 1 5 August 8.9 3.0× Okazaki Aichi, Japan 1 4 August 8.7 3.0× Chiryū Aichi, Japan 1 4 August 8.6 3.0× Tajimi Gifu, Japan 1 4 August 8.7 3.0× Tokyo Tokyo, Japan 1 4 August 8.4 3.0× Iida Nagano, Japan 1 4 August 8.2 3.0× Amagasaki Hyōgo, Japan 1 4 August 8.2 3.0× Tahara Aichi, Japan 1 4 August 10.0 2.9× Yaita Tochigi, Japan 1 5 August 9.8 2.9× Igusa Saitama, Japan 1 5 August 9.3 2.9× Naka Ibaraki, Japan 1 4 August 8.9 2.9× Yachiyo Chiba, Japan 1 4 August 8.7 2.9× Hachiōji Tokyo, Japan 1 5 August 10.2 2.8× Kiryū Gunma, Japan 1 5 August 10.4 2.8× Ono Hyōgo, Japan 1 4 August 9.0 2.8× Aihara Kanagawa, Japan 2 5 August 10.9 2.7× Toki Gifu, Japan 2 4 August 10.2 2.7× Mima Tokushima, Japan 1 4 August 11.2 2.6× Ōme Tokyo, Japan 2 5 August 10.9 2.6× Morohongō Saitama, Japan 1 5 August 9.9 2.6× Nagahama Shiga, Japan 1 4 August 9.8 2.6× Iruma Saitama, Japan 1 5 August 10.0 2.6× Tsuchiura Ibaraki, Japan 2 5 August 11.2 2.5× Minawa Kanagawa, Japan 1 4 August 10.3 2.5× Tottori-shi Tottori, Japan 1 4 August 10.2 2.5× Kani Gifu, Japan 1 4 August 9.9 2.5×
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
Number 9 of 39 episodes in Japan 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 Japan, November 2023 131 Japan, 4 to 5 August 2025 126 Japan, January and February 2025 110 Japan, May 2025 103 Japan, March 2025 92 Bars: cities reached; colour: the level of the episode's highest daily reading. All 39 .
Use this page SmogRank, Japan, 4 to 5 August 2025: 126 cities with PM2.5 at twice their usual or more, 4 to 5 August 2025, smogrank.com/episodes/2025-08-04-japan (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.
