SmogRank / Episodes / Japan
Japan and South Korea, 31 January to 1 February 2025
For 2 days, from 31 January to 1 February 2025, 113 cities in Japan and South Korea had PM2.5 at least twice their usual for the time of year. The worst reading was Yawata, Kyoto, Japan: 37.5 µg/m³ on 1 February, about 4.0× its usual 9.4. Ended 1 February.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 113 in 2 countries
Days 2 31 January to 1 February 2025
Worst day 31 January 98 cities counted
Furthest above usual 6.4× Kyōtango
Day by day
Play 31 January 98 cities at twice their usual or more
Tanba Nishiwaki Niimi Tonoshō Yasugichō Matsue Takatsuki Takinomiya Kumagawa Kamojimachō-jōgejima Tokushima Unnan Yoshinogawa Mima Tsuruga Izumo Ikedachō Miyoshi Mihara Sabae Kawaguchi Mikuni Fukui-shi Nagahama Hiwasaura Ōdachō-ōda Takehara Kaga Yae Ono Aki Nankoku Komatsu Inabe Kochi Gōtsuchō Gion Ino Yokkaichi Kure Hiroshima Kuwana Matsutō Owase Nonoichi Ichinomiya Kanazawa Kumano Matsuyama Shinagawa Hamada Shingū Kuma Susaki Sekimachi Iyo Nagoya Inuyama Tokoname Tsubata Tōkai Kaminoma Ōtake Iwakuni Owariasahi Oyabe Hekinan Toba Nisshin Hakui Chiryū Seto Tonami Masuda Shima Anjō Minamichita Toyota Yanai Okazaki Takaoka Himimachi Yawatahama Gamagōri Nanao Imizu Hikari Shūnan Kudamatsu Toyama Uwajima Toyohashi Namerikawa Shinshiro Uozu Hagi Kosai Hōfu Yamaguchi Kiso Nyūzen Kunisaki Iida Nagato Hamamatsu Hamakita Mine Ina Iwata Ube Tsurusaki Onoda Matsumoto Okaya Ōita Kakegawa Itoigawa Suwa Beppu Chikuma Nakatsu Kikugawa Buzen Shimonoseki Shimada Yufu Kanda Yukuhashi Nagano Fujieda Ueda Kitakyushu Shizuoka Suzaka Obuse Minami-Alps Koga Nakama Saku Tagawa Jōetsu Nōgata Kofu Hita Iizuka Fujinomiya Kanbara Saikubo Munakata Yamanashi Fuji Ukiha Tanushimarumachi-toyoki Koga Wakasugi Fujiyoshida Yame Ogōri Kasuga Fukuoka Numazu Tosu Susono Kurume Tomioka Nakanojō Gotemba Ōtsuki Izunokuni Chikugo Sado Shimoda Kanzakimachi-kanzaki Takasaki Shibukawa Atami Chichibu Maebaru-chūō Yanagawa Minamiuonuma Itoshima Minamiashigara Minano Numata Saga Kodamachō-kodamaminami Odawara Nagaoka Yorii Hadano Honjō Ōme Ogawamachi Sakai-nakajima Taku Morohongō Aihara Minawa Higashigō Hannō Hachiōji Hiratsuka Karatsu Maki Iruma Atsugi Akishima Yokota Kiryū Sakado Ebina Chigasaki Ōta Kumagaya Sayama Menuma Takeo Moroura Ayase Higashi-Matsuyama Iki Shirone Imarichō-kō Niigata Niitsu-honchō Kameda-honchō Matsuura Sasebo Furukawamen Seirō Shibata Shikokuchūō Higashihiroshima Dodong-ri Saijō Onomichi Fukuyama Niihama Tahara Hashimoto Bizen Kasaoka Kan’onjichō Sakai Kurashiki Tamano Marugame Imabari Higashiosaka Osaka Tondabayashichō Zentsujichó Hayashima Hōryūji Shin’ichi Sandachō Yao Asakuchi Anan Hiragi Sōja Minato Shido Higashinozoe Kawachi-Nagano Izumi Sayama Suzuka Takahashi Akashi Hirakata Habikino Amagasaki Kariya Tenri Handa Saikū Kinokawa Narutochō-mitsuishi Ono Takamatsu Aioi Kakogawachō-honmachi Gobō Ikaruga Tanabe Kariya Kashiwara Kobe Okayama Nishio Izumisano Iwade Kishiwada Kameyama Nishinomiya Sugai Takarazuka Ayabe Matsusaka Kizugawa Takashima Ise Fukuchiyama Kainan Sennan Tatsuno Nantan Tsuyama Kashihara-shi Yawata Kyoto Shimogamo Ama Toyonaka Tsu Himeji Ikoma Iga Uji Nabari Toyooka Kōtari Hikone Ueno-ebisumachi Kusatsu Maizuru Obama Kameoka Kurayoshi Arida Jōyō Kitahama Fukuroi Ōmihachiman Kōka Yono Yonago Youkaichi Ōtsu Miyazu Tottori-shi Sakaiminato Kyōtango 28 Jan 29 30 31 1 Feb 2 3 4 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
Yawata Yawata, 28 January: 10.4 µg/m³ Yawata, 29 January: 6.9 µg/m³ Yawata, 30 January: 11.0 µg/m³ Yawata, 31 January: 32.7 µg/m³, 3.5× its usual 9.4 Yawata, 1 February: 37.5 µg/m³, 4.0× its usual 9.4 Yawata, 2 February: 9.9 µg/m³ Yawata, 3 February: 11.5 µg/m³ Yawata, 4 February: 9.1 µg/m³ Tottori-shi Tottori-shi, 28 January: 8.6 µg/m³ Tottori-shi, 29 January: 9.7 µg/m³ Tottori-shi, 30 January: 13.9 µg/m³ Tottori-shi, 31 January: 36.7 µg/m³, 5.6× its usual 6.6 Tottori-shi, 1 February: 19.0 µg/m³ Tottori-shi, 2 February: 6.6 µg/m³ Tottori-shi, 3 February: 9.7 µg/m³ Tottori-shi, 4 February: 6.2 µg/m³ Sakaiminato Sakaiminato, 28 January: 7.4 µg/m³ Sakaiminato, 29 January: 8.2 µg/m³ Sakaiminato, 30 January: 12.0 µg/m³ Sakaiminato, 31 January: 36.4 µg/m³, 5.8× its usual 6.3 Sakaiminato, 1 February: 18.6 µg/m³ Sakaiminato, 2 February: 5.4 µg/m³ Sakaiminato, 3 February: 8.2 µg/m³ Sakaiminato, 4 February: 6.2 µg/m³ Nabari Nabari, 28 January: 9.1 µg/m³ Nabari, 29 January: 6.9 µg/m³ Nabari, 30 January: 11.8 µg/m³ Nabari, 31 January: 35.3 µg/m³, 4.2× its usual 8.4 Nabari, 1 February: 29.0 µg/m³, 3.4× its usual 8.5 Nabari, 2 February: 8.2 µg/m³ Nabari, 3 February: 10.0 µg/m³ Nabari, 4 February: 10.6 µg/m³ Kōtari Kōtari, 28 January: 9.8 µg/m³ Kōtari, 29 January: 7.1 µg/m³ Kōtari, 30 January: 10.5 µg/m³ Kōtari, 31 January: 34.2 µg/m³, 4.2× its usual 8.2 Kōtari, 1 February: 35.1 µg/m³, 4.3× its usual 8.2 Kōtari, 2 February: 8.5 µg/m³ Kōtari, 3 February: 11.6 µg/m³ Kōtari, 4 February: 7.8 µg/m³ Jōyō Jōyō, 28 January: 8.9 µg/m³ Jōyō, 29 January: 6.1 µg/m³ Jōyō, 30 January: 9.4 µg/m³ Jōyō, 31 January: 32.2 µg/m³, 4.3× its usual 7.5 Jōyō, 1 February: 35.1 µg/m³, 4.6× its usual 7.6 Jōyō, 2 February: 8.2 µg/m³ Jōyō, 3 February: 10.6 µg/m³ Jōyō, 4 February: 8.2 µg/m³ Uji Uji, 28 January: 10.3 µg/m³ Uji, 29 January: 6.5 µg/m³ Uji, 30 January: 9.6 µg/m³ Uji, 31 January: 31.8 µg/m³, 3.9× its usual 8.2 Uji, 1 February: 35.1 µg/m³, 4.2× its usual 8.3 Uji, 2 February: 8.4 µg/m³ Uji, 3 February: 10.7 µg/m³ Uji, 4 February: 9.0 µg/m³ Arida Arida, 28 January: 10.2 µg/m³ Arida, 29 January: 7.7 µg/m³ Arida, 30 January: 13.6 µg/m³ Arida, 31 January: 33.0 µg/m³, 4.3× its usual 7.6 Arida, 1 February: 34.9 µg/m³, 4.6× its usual 7.6 Arida, 2 February: 8.9 µg/m³ Arida, 3 February: 12.7 µg/m³ Arida, 4 February: 11.0 µg/m³ Higashinozoe Higashinozoe, 28 January: 10.3 µg/m³ Higashinozoe, 29 January: 7.4 µg/m³ Higashinozoe, 30 January: 13.3 µg/m³ Higashinozoe, 31 January: 32.4 µg/m³, 3.1× its usual 10.3 Higashinozoe, 1 February: 34.7 µg/m³, 3.4× its usual 10.3 Higashinozoe, 2 February: 9.9 µg/m³ Higashinozoe, 3 February: 12.7 µg/m³ Higashinozoe, 4 February: 9.2 µg/m³ Osaka Osaka, 28 January: 9.7 µg/m³ Osaka, 29 January: 6.3 µg/m³ Osaka, 30 January: 10.8 µg/m³ Osaka, 31 January: 30.4 µg/m³, 2.9× its usual 10.4 Osaka, 1 February: 34.6 µg/m³, 3.2× its usual 10.7 Osaka, 2 February: 8.7 µg/m³ Osaka, 3 February: 10.9 µg/m³ Osaka, 4 February: 8.9 µg/m³ Youkaichi Youkaichi, 28 January: 9.5 µg/m³ Youkaichi, 29 January: 6.4 µg/m³ Youkaichi, 30 January: 10.1 µg/m³ Youkaichi, 31 January: 30.0 µg/m³, 4.3× its usual 6.9 Youkaichi, 1 February: 34.3 µg/m³, 5.0× its usual 6.9 Youkaichi, 2 February: 9.2 µg/m³ Youkaichi, 3 February: 10.3 µg/m³ Youkaichi, 4 February: 6.7 µg/m³ Sugai Sugai, 28 January: 9.9 µg/m³ Sugai, 29 January: 6.9 µg/m³ Sugai, 30 January: 10.3 µg/m³ Sugai, 31 January: 31.1 µg/m³, 3.6× its usual 8.6 Sugai, 1 February: 34.0 µg/m³, 3.8× its usual 8.9 Sugai, 2 February: 8.8 µg/m³ Sugai, 3 February: 9.9 µg/m³ Sugai, 4 February: 8.4 µg/m³ Kyōtango Kyōtango, 28 January: 6.4 µg/m³ Kyōtango, 29 January: 8.2 µg/m³ Kyōtango, 30 January: 8.6 µg/m³ Kyōtango, 31 January: 33.7 µg/m³, 6.4× its usual 5.3 Kyōtango, 1 February: 20.3 µg/m³ Kyōtango, 2 February: 8.3 µg/m³ Kyōtango, 3 February: 8.4 µg/m³ Kyōtango, 4 February: 3.6 µg/m³ Tenri Tenri, 28 January: 9.5 µg/m³ Tenri, 29 January: 6.4 µg/m³ Tenri, 30 January: 11.0 µg/m³ Tenri, 31 January: 31.3 µg/m³, 3.3× its usual 9.6 Tenri, 1 February: 33.7 µg/m³, 3.5× its usual 9.7 Tenri, 2 February: 7.2 µg/m³ Tenri, 3 February: 9.6 µg/m³ Tenri, 4 February: 8.6 µg/m³ Higashiosaka Higashiosaka, 28 January: 9.3 µg/m³ Higashiosaka, 29 January: 5.8 µg/m³ Higashiosaka, 30 January: 11.0 µg/m³ Higashiosaka, 31 January: 31.0 µg/m³, 2.9× its usual 10.7 Higashiosaka, 1 February: 33.7 µg/m³, 3.1× its usual 10.8 Higashiosaka, 2 February: 6.7 µg/m³ Higashiosaka, 3 February: 11.0 µg/m³ Higashiosaka, 4 February: 9.1 µg/m³ Kariya Kariya, 28 January: 10.8 µg/m³ Kariya, 29 January: 8.1 µg/m³ Kariya, 30 January: 13.3 µg/m³ Kariya, 31 January: 33.5 µg/m³, 3.5× its usual 9.6 Kariya, 1 February: 33.1 µg/m³, 3.3× its usual 10.1 Kariya, 2 February: 9.9 µg/m³ Kariya, 3 February: 9.3 µg/m³ Kariya, 4 February: 10.0 µg/m³ Kishiwada Kishiwada, 28 January: 7.2 µg/m³ Kishiwada, 29 January: 6.5 µg/m³ Kishiwada, 30 January: 10.9 µg/m³ Kishiwada, 31 January: 29.0 µg/m³, 3.4× its usual 8.6 Kishiwada, 1 February: 33.2 µg/m³, 3.7× its usual 9.0 Kishiwada, 2 February: 8.6 µg/m³ Kishiwada, 3 February: 10.9 µg/m³ Kishiwada, 4 February: 8.6 µg/m³ Dodong-ri Dodong-ri, 28 January: 13.8 µg/m³ Dodong-ri, 29 January: 14.3 µg/m³ Dodong-ri, 30 January: 9.6 µg/m³ Dodong-ri, 31 January: 32.6 µg/m³, 2.7× its usual 11.9 Dodong-ri, 1 February: 14.4 µg/m³ Dodong-ri, 2 February: 7.4 µg/m³ Dodong-ri, 3 February: 13.3 µg/m³ Dodong-ri, 4 February: 10.0 µg/m³ Yonago Yonago, 28 January: 5.8 µg/m³ Yonago, 29 January: 9.3 µg/m³ Yonago, 30 January: 12.1 µg/m³ Yonago, 31 January: 32.5 µg/m³, 5.0× its usual 6.5 Yonago, 1 February: 17.9 µg/m³ Yonago, 2 February: 6.1 µg/m³ Yonago, 3 February: 7.6 µg/m³ Yonago, 4 February: 5.5 µg/m³ Kakogawachō-honmachi Kakogawachō-honmachi, 28 January: 9.8 µg/m³ Kakogawachō-honmachi, 29 January: 6.8 µg/m³ Kakogawachō-honmachi, 30 January: 11.1 µg/m³ Kakogawachō-honmachi, 31 January: 28.9 µg/m³, 3.2× its usual 8.9 Kakogawachō-honmachi, 1 February: 32.3 µg/m³, 3.6× its usual 8.9 Kakogawachō-honmachi, 2 February: 8.6 µg/m³ Kakogawachō-honmachi, 3 February: 9.7 µg/m³ Kakogawachō-honmachi, 4 February: 8.4 µg/m³ Amagasaki Amagasaki, 28 January: 9.8 µg/m³ Amagasaki, 29 January: 6.8 µg/m³ Amagasaki, 30 January: 10.6 µg/m³ Amagasaki, 31 January: 30.5 µg/m³, 3.4× its usual 9.1 Amagasaki, 1 February: 32.1 µg/m³, 3.5× its usual 9.2 Amagasaki, 2 February: 8.6 µg/m³ Amagasaki, 3 February: 12.0 µg/m³ Amagasaki, 4 February: 8.6 µg/m³ Miyazu Miyazu, 28 January: 7.0 µg/m³ Miyazu, 29 January: 9.2 µg/m³ Miyazu, 30 January: 11.1 µg/m³ Miyazu, 31 January: 32.0 µg/m³, 5.2× its usual 6.2 Miyazu, 1 February: 19.8 µg/m³ Miyazu, 2 February: 8.1 µg/m³ Miyazu, 3 February: 8.7 µg/m³ Miyazu, 4 February: 5.4 µg/m³ Aioi Aioi, 28 January: 9.6 µg/m³ Aioi, 29 January: 7.1 µg/m³ Aioi, 30 January: 13.0 µg/m³ Aioi, 31 January: 31.7 µg/m³, 3.6× its usual 8.8 Aioi, 1 February: 31.6 µg/m³, 3.3× its usual 9.6 Aioi, 2 February: 8.6 µg/m³ Aioi, 3 February: 8.5 µg/m³ Aioi, 4 February: 9.5 µg/m³ Asakuchi Asakuchi, 28 January: 10.1 µg/m³ Asakuchi, 29 January: 6.7 µg/m³ Asakuchi, 30 January: 13.3 µg/m³ Asakuchi, 31 January: 26.7 µg/m³, 2.8× its usual 9.4 Asakuchi, 1 February: 31.7 µg/m³, 3.3× its usual 9.6 Asakuchi, 2 February: 12.0 µg/m³ Asakuchi, 3 February: 13.7 µg/m³ Asakuchi, 4 February: 6.8 µg/m³ Iga Iga, 28 January: 8.4 µg/m³ Iga, 29 January: 6.7 µg/m³ Iga, 30 January: 9.6 µg/m³ Iga, 31 January: 30.5 µg/m³, 4.0× its usual 7.6 Iga, 1 February: 31.6 µg/m³, 4.2× its usual 7.6 Iga, 2 February: 7.8 µg/m³ Iga, 3 February: 10.0 µg/m³ Iga, 4 February: 9.0 µg/m³ Habikino Habikino, 28 January: 8.0 µg/m³ Habikino, 29 January: 5.6 µg/m³ Habikino, 30 January: 10.6 µg/m³ Habikino, 31 January: 29.1 µg/m³, 3.4× its usual 8.6 Habikino, 1 February: 31.6 µg/m³, 3.5× its usual 9.1 Habikino, 2 February: 6.2 µg/m³ Habikino, 3 February: 14.5 µg/m³ Habikino, 4 February: 7.8 µg/m³ Kameoka Kameoka, 28 January: 9.5 µg/m³ Kameoka, 29 January: 5.8 µg/m³ Kameoka, 30 January: 9.6 µg/m³ Kameoka, 31 January: 31.4 µg/m³, 4.5× its usual 7.0 Kameoka, 1 February: 28.5 µg/m³, 4.0× its usual 7.1 Kameoka, 2 February: 8.6 µg/m³ Kameoka, 3 February: 8.1 µg/m³ Kameoka, 4 February: 7.9 µg/m³ Shimogamo Shimogamo, 28 January: no reading Shimogamo, 29 January: 6.1 µg/m³ Shimogamo, 30 January: 13.5 µg/m³ Shimogamo, 31 January: 31.3 µg/m³, 4.1× its usual 7.7 Shimogamo, 1 February: 28.0 µg/m³, 3.6× its usual 7.7 Shimogamo, 2 February: no reading Shimogamo, 3 February: 9.0 µg/m³ Shimogamo, 4 February: 8.9 µg/m³ Tamano Tamano, 28 January: 8.8 µg/m³ Tamano, 29 January: 7.5 µg/m³ Tamano, 30 January: 14.6 µg/m³ Tamano, 31 January: 27.3 µg/m³, 2.6× its usual 10.4 Tamano, 1 February: 31.3 µg/m³, 3.0× its usual 10.5 Tamano, 2 February: 11.0 µg/m³ Tamano, 3 February: no reading Tamano, 4 February: no reading Kizugawa Kizugawa, 28 January: 7.6 µg/m³ Kizugawa, 29 January: 5.9 µg/m³ Kizugawa, 30 January: 9.1 µg/m³ Kizugawa, 31 January: 31.1 µg/m³, 3.9× its usual 7.9 Kizugawa, 1 February: 31.2 µg/m³, 3.9× its usual 8.1 Kizugawa, 2 February: 6.8 µg/m³ Kizugawa, 3 February: 9.1 µg/m³ Kizugawa, 4 February: 8.1 µg/m³ Ōmihachiman Ōmihachiman, 28 January: 8.9 µg/m³ Ōmihachiman, 29 January: 5.9 µg/m³ Ōmihachiman, 30 January: 8.5 µg/m³ Ōmihachiman, 31 January: 27.9 µg/m³, 4.2× its usual 6.6 Ōmihachiman, 1 February: 31.2 µg/m³, 4.7× its usual 6.6 Ōmihachiman, 2 February: 9.1 µg/m³ Ōmihachiman, 3 February: 8.9 µg/m³ Ōmihachiman, 4 February: 6.3 µg/m³ Takamatsu Takamatsu, 28 January: 8.6 µg/m³ Takamatsu, 29 January: 5.3 µg/m³ Takamatsu, 30 January: 12.5 µg/m³ Takamatsu, 31 January: 26.3 µg/m³, 3.1× its usual 8.6 Takamatsu, 1 February: 31.2 µg/m³, 3.6× its usual 8.6 Takamatsu, 2 February: 12.1 µg/m³ Takamatsu, 3 February: 14.7 µg/m³ Takamatsu, 4 February: 8.4 µg/m³ Kusatsu Kusatsu, 28 January: 9.7 µg/m³ Kusatsu, 29 January: 6.1 µg/m³ Kusatsu, 30 January: 9.0 µg/m³ Kusatsu, 31 January: 31.1 µg/m³, 4.4× its usual 7.1 Kusatsu, 1 February: 30.8 µg/m³, 4.3× its usual 7.1 Kusatsu, 2 February: 9.2 µg/m³ Kusatsu, 3 February: 10.0 µg/m³ Kusatsu, 4 February: 7.7 µg/m³ Kyoto Kyoto, 28 January: 9.7 µg/m³ Kyoto, 29 January: 5.9 µg/m³ Kyoto, 30 January: 9.1 µg/m³ Kyoto, 31 January: 30.2 µg/m³, 4.0× its usual 7.6 Kyoto, 1 February: 31.1 µg/m³, 4.1× its usual 7.6 Kyoto, 2 February: 7.7 µg/m³ Kyoto, 3 February: 10.0 µg/m³ Kyoto, 4 February: 7.4 µg/m³ Kashihara-shi Kashihara-shi, 28 January: 7.3 µg/m³ Kashihara-shi, 29 January: 5.0 µg/m³ Kashihara-shi, 30 January: 8.9 µg/m³ Kashihara-shi, 31 January: 29.0 µg/m³, 3.7× its usual 7.8 Kashihara-shi, 1 February: 31.1 µg/m³, 4.0× its usual 7.8 Kashihara-shi, 2 February: 7.2 µg/m³ Kashihara-shi, 3 February: 8.1 µg/m³ Kashihara-shi, 4 February: 6.3 µg/m³ Kurashiki Kurashiki, 28 January: 10.1 µg/m³ Kurashiki, 29 January: 6.9 µg/m³ Kurashiki, 30 January: 13.0 µg/m³ Kurashiki, 31 January: 25.5 µg/m³, 2.5× its usual 10.4 Kurashiki, 1 February: 31.1 µg/m³, 3.0× its usual 10.5 Kurashiki, 2 February: 10.3 µg/m³ Kurashiki, 3 February: 12.4 µg/m³ Kurashiki, 4 February: 9.2 µg/m³ Yao Yao, 28 January: 8.9 µg/m³ Yao, 29 January: 5.5 µg/m³ Yao, 30 January: 10.4 µg/m³ Yao, 31 January: 31.0 µg/m³, 3.3× its usual 9.5 Yao, 1 February: 30.5 µg/m³, 3.1× its usual 9.8 Yao, 2 February: 6.4 µg/m³ Yao, 3 February: 10.5 µg/m³ Yao, 4 February: 8.1 µg/m³ Hirakata Hirakata, 28 January: 8.6 µg/m³ Hirakata, 29 January: 5.7 µg/m³ Hirakata, 30 January: 8.9 µg/m³ Hirakata, 31 January: 29.9 µg/m³, 3.7× its usual 8.1 Hirakata, 1 February: 31.0 µg/m³, 3.5× its usual 8.8 Hirakata, 2 February: 7.6 µg/m³ Hirakata, 3 February: 10.1 µg/m³ Hirakata, 4 February: 7.7 µg/m³ Ueno-ebisumachi Ueno-ebisumachi, 28 January: 7.6 µg/m³ Ueno-ebisumachi, 29 January: 5.4 µg/m³ Ueno-ebisumachi, 30 January: 9.2 µg/m³ Ueno-ebisumachi, 31 January: 30.9 µg/m³, 4.4× its usual 7.1 Ueno-ebisumachi, 1 February: 28.7 µg/m³, 4.0× its usual 7.1 Ueno-ebisumachi, 2 February: 7.1 µg/m³ Ueno-ebisumachi, 3 February: 9.6 µg/m³ Ueno-ebisumachi, 4 February: 8.0 µg/m³ Sakai Sakai, 28 January: 8.5 µg/m³ Sakai, 29 January: 5.4 µg/m³ Sakai, 30 January: 10.1 µg/m³ Sakai, 31 January: 29.4 µg/m³, 3.2× its usual 9.3 Sakai, 1 February: 30.9 µg/m³, 3.0× its usual 10.2 Sakai, 2 February: 8.8 µg/m³ Sakai, 3 February: 10.3 µg/m³ Sakai, 4 February: 8.2 µg/m³ Sandachō Sandachō, 28 January: 9.7 µg/m³ Sandachō, 29 January: 6.8 µg/m³ Sandachō, 30 January: 10.6 µg/m³ Sandachō, 31 January: 30.8 µg/m³, 3.3× its usual 9.4 Sandachō, 1 February: 30.0 µg/m³, 3.2× its usual 9.4 Sandachō, 2 February: 8.7 µg/m³ Sandachō, 3 February: 9.9 µg/m³ Sandachō, 4 February: 8.1 µg/m³ Tsuyama Tsuyama, 28 January: 8.0 µg/m³ Tsuyama, 29 January: 6.4 µg/m³ Tsuyama, 30 January: 11.1 µg/m³ Tsuyama, 31 January: 27.9 µg/m³, 3.6× its usual 7.7 Tsuyama, 1 February: 30.8 µg/m³, 4.0× its usual 7.7 Tsuyama, 2 February: 9.4 µg/m³ Tsuyama, 3 February: 8.6 µg/m³ Tsuyama, 4 February: 6.2 µg/m³ Iwade Iwade, 28 January: 7.5 µg/m³ Iwade, 29 January: 5.0 µg/m³ Iwade, 30 January: 9.3 µg/m³ Iwade, 31 January: 26.9 µg/m³, 3.4× its usual 8.0 Iwade, 1 February: 30.8 µg/m³, 3.7× its usual 8.3 Iwade, 2 February: 7.4 µg/m³ Iwade, 3 February: 9.2 µg/m³ Iwade, 4 February: 7.8 µg/m³ Shido Shido, 28 January: 8.7 µg/m³ Shido, 29 January: 5.2 µg/m³ Shido, 30 January: 12.5 µg/m³ Shido, 31 January: 27.6 µg/m³, 3.1× its usual 8.9 Shido, 1 February: 30.7 µg/m³, 3.4× its usual 9.0 Shido, 2 February: 11.7 µg/m³ Shido, 3 February: 13.4 µg/m³ Shido, 4 February: 8.9 µg/m³ Nantan Nantan, 28 January: 8.7 µg/m³ Nantan, 29 January: 8.1 µg/m³ Nantan, 30 January: 11.7 µg/m³ Nantan, 31 January: 27.4 µg/m³, 3.6× its usual 7.6 Nantan, 1 February: 30.7 µg/m³, 4.0× its usual 7.6 Nantan, 2 February: no reading Nantan, 3 February: no reading Nantan, 4 February: no reading Akashi Akashi, 28 January: 8.6 µg/m³ Akashi, 29 January: 6.3 µg/m³ Akashi, 30 January: 11.1 µg/m³ Akashi, 31 January: 28.7 µg/m³, 3.3× its usual 8.8 Akashi, 1 February: 30.6 µg/m³, 3.5× its usual 8.8 Akashi, 2 February: 7.8 µg/m³ Akashi, 3 February: 10.4 µg/m³ Akashi, 4 February: 7.8 µg/m³ Fukuyama Fukuyama, 28 January: 9.9 µg/m³ Fukuyama, 29 January: 6.3 µg/m³ Fukuyama, 30 January: 13.4 µg/m³ Fukuyama, 31 January: 27.2 µg/m³, 2.5× its usual 10.8 Fukuyama, 1 February: 30.6 µg/m³, 2.8× its usual 10.9 Fukuyama, 2 February: 10.9 µg/m³ Fukuyama, 3 February: 13.7 µg/m³ Fukuyama, 4 February: 9.2 µg/m³ Tatsuno Tatsuno, 28 January: 8.5 µg/m³ Tatsuno, 29 January: 5.6 µg/m³ Tatsuno, 30 January: 11.4 µg/m³ Tatsuno, 31 January: 29.3 µg/m³, 3.8× its usual 7.7 Tatsuno, 1 February: 30.5 µg/m³, 4.0× its usual 7.7 Tatsuno, 2 February: 6.5 µg/m³ Tatsuno, 3 February: 7.2 µg/m³ Tatsuno, 4 February: 7.1 µg/m³ Yono Yono, 28 January: 8.5 µg/m³ Yono, 29 January: 7.0 µg/m³ Yono, 30 January: 9.7 µg/m³ Yono, 31 January: 30.3 µg/m³, 4.9× its usual 6.2 Yono, 1 February: 25.0 µg/m³, 3.8× its usual 6.5 Yono, 2 February: 6.8 µg/m³ Yono, 3 February: 9.5 µg/m³ Yono, 4 February: 8.4 µg/m³ Kurayoshi Kurayoshi, 28 January: 8.0 µg/m³ Kurayoshi, 29 January: 8.1 µg/m³ Kurayoshi, 30 January: 12.5 µg/m³ Kurayoshi, 31 January: 30.3 µg/m³, 4.6× its usual 6.6 Kurayoshi, 1 February: 13.7 µg/m³ Kurayoshi, 2 February: 5.1 µg/m³ Kurayoshi, 3 February: 8.6 µg/m³ Kurayoshi, 4 February: 7.0 µg/m³ Takahashi Takahashi, 28 January: 9.1 µg/m³ Takahashi, 29 January: no reading Takahashi, 30 January: no reading Takahashi, 31 January: 30.3 µg/m³, 3.5× its usual 8.6 Takahashi, 1 February: 29.6 µg/m³, 3.4× its usual 8.6 Takahashi, 2 February: 6.5 µg/m³ Takahashi, 3 February: 9.3 µg/m³ Takahashi, 4 February: 9.1 µg/m³ Sennan Sennan, 28 January: 6.3 µg/m³ Sennan, 29 January: 4.1 µg/m³ Sennan, 30 January: 8.7 µg/m³ Sennan, 31 January: 25.7 µg/m³, 3.8× its usual 6.8 Sennan, 1 February: 30.3 µg/m³, 4.0× its usual 7.5 Sennan, 2 February: 7.0 µg/m³ Sennan, 3 February: 8.7 µg/m³ Sennan, 4 February: 7.1 µg/m³ Ōtsu Ōtsu, 28 January: 7.6 µg/m³ Ōtsu, 29 January: 5.1 µg/m³ Ōtsu, 30 January: 8.2 µg/m³ Ōtsu, 31 January: 28.7 µg/m³, 4.9× its usual 5.8 Ōtsu, 1 February: 30.2 µg/m³, 5.2× its usual 5.8 Ōtsu, 2 February: 7.5 µg/m³ Ōtsu, 3 February: 8.7 µg/m³ Ōtsu, 4 February: 6.1 µg/m³ Minato Minato, 28 January: 8.4 µg/m³ Minato, 29 January: 5.7 µg/m³ Minato, 30 January: 11.3 µg/m³ Minato, 31 January: 27.1 µg/m³, 3.3× its usual 8.3 Minato, 1 February: 30.2 µg/m³, 3.4× its usual 8.8 Minato, 2 February: 7.9 µg/m³ Minato, 3 February: 10.4 µg/m³ Minato, 4 February: 9.0 µg/m³ Izumisano Izumisano, 28 January: 6.5 µg/m³ Izumisano, 29 January: 5.1 µg/m³ Izumisano, 30 January: 9.2 µg/m³ Izumisano, 31 January: 26.7 µg/m³, 3.6× its usual 7.4 Izumisano, 1 February: 30.2 µg/m³, 3.7× its usual 8.2 Izumisano, 2 February: 8.2 µg/m³ Izumisano, 3 February: 8.9 µg/m³ Izumisano, 4 February: 7.3 µg/m³ Onomichi Onomichi, 28 January: 9.1 µg/m³ Onomichi, 29 January: 6.0 µg/m³ Onomichi, 30 January: 13.5 µg/m³ Onomichi, 31 January: 28.2 µg/m³, 2.6× its usual 10.8 Onomichi, 1 February: 30.0 µg/m³, 2.8× its usual 10.9 Onomichi, 2 February: 12.0 µg/m³ Onomichi, 3 February: 14.0 µg/m³ Onomichi, 4 February: 8.4 µg/m³ Kainan Kainan, 28 January: 7.4 µg/m³ Kainan, 29 January: 5.2 µg/m³ Kainan, 30 January: 10.7 µg/m³ Kainan, 31 January: 26.6 µg/m³, 3.6× its usual 7.4 Kainan, 1 February: 30.0 µg/m³, 4.0× its usual 7.5 Kainan, 2 February: 7.7 µg/m³ Kainan, 3 February: 9.4 µg/m³ Kainan, 4 February: 8.0 µg/m³ Kan’onjichō Kan’onjichō, 28 January: 6.6 µg/m³ Kan’onjichō, 29 January: 4.9 µg/m³ Kan’onjichō, 30 January: 9.9 µg/m³ Kan’onjichō, 31 January: 25.7 µg/m³, 2.6× its usual 10.0 Kan’onjichō, 1 February: 30.0 µg/m³, 3.0× its usual 10.0 Kan’onjichō, 2 February: 8.6 µg/m³ Kan’onjichō, 3 February: 11.3 µg/m³ Kan’onjichō, 4 February: 5.9 µg/m³ Shin’ichi Shin’ichi, 28 January: 10.4 µg/m³ Shin’ichi, 29 January: 7.1 µg/m³ Shin’ichi, 30 January: 15.1 µg/m³ Shin’ichi, 31 January: 29.9 µg/m³, 3.3× its usual 9.1 Shin’ichi, 1 February: 28.5 µg/m³, 3.0× its usual 9.4 Shin’ichi, 2 February: 6.9 µg/m³ Shin’ichi, 3 February: 12.3 µg/m³ Shin’ichi, 4 February: 10.0 µg/m³ Nishio Nishio, 28 January: 12.5 µg/m³ Nishio, 29 January: 7.2 µg/m³ Nishio, 30 January: 7.8 µg/m³ Nishio, 31 January: 18.7 µg/m³ Nishio, 1 February: 29.9 µg/m³, 3.7× its usual 8.1 Nishio, 2 February: 12.0 µg/m³ Nishio, 3 February: 11.9 µg/m³ Nishio, 4 February: 8.1 µg/m³ 28 Jan 29 30 31 1 Feb 2 3 4 The 60 cities with the highest readings of 113, 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
Kyōtango Kyoto, Japan 1 31 January 5.3 6.4× Sakaiminato Tottori, Japan 1 31 January 6.3 5.8× Tottori-shi Tottori, Japan 1 31 January 6.6 5.6× Miyazu Kyoto, Japan 1 31 January 6.2 5.2× Ōtsu Shiga, Japan 2 1 February 5.8 5.2× Youkaichi Shiga, Japan 2 1 February 6.9 5.0× Yonago Tottori, Japan 1 31 January 6.5 5.0× Yono Osaka, Japan 2 31 January 6.2 4.9× Kōka Shiga, Japan 2 1 February 5.6 4.8× Ōmihachiman Shiga, Japan 2 1 February 6.6 4.7× Fukuroi Shizuoka, Japan 1 1 February 5.9 4.7× Kitahama Shiga, Japan 2 31 January 5.7 4.7× Jōyō Kyoto, Japan 2 1 February 7.6 4.6× Arida Wakayama, Japan 2 1 February 7.6 4.6× Kurayoshi Tottori, Japan 1 31 January 6.6 4.6× Kameoka Kyoto, Japan 2 31 January 7.0 4.5× Obama Fukui, Japan 1 31 January 5.9 4.5× Maizuru Kyoto, Japan 2 1 February 5.9 4.5× Kusatsu Shiga, Japan 2 31 January 7.1 4.4× Ueno-ebisumachi Mie, Japan 2 31 January 7.1 4.4× Hikone Shiga, Japan 1 1 February 6.5 4.4× Kōtari Kyoto, Japan 2 1 February 8.2 4.3× Toyooka Hyōgo, Japan 1 31 January 6.5 4.3× Nabari Mie, Japan 2 31 January 8.4 4.2× Uji Kyoto, Japan 2 1 February 8.3 4.2× Iga Mie, Japan 2 1 February 7.6 4.2× Ikoma Nara, Japan 2 1 February 7.1 4.2× Himeji Hyōgo, Japan 2 1 February 7.0 4.2× Tsu Mie, Japan 2 31 January 6.9 4.2× Toyonaka Osaka, Japan 2 31 January 6.6 4.2× Ama Aichi, Japan 1 1 February 6.1 4.2× Shimogamo Okayama, Japan 2 31 January 7.7 4.1× Kyoto Kyoto, Japan 2 1 February 7.6 4.1× Yawata Kyoto, Japan 2 1 February 9.4 4.0× Kashihara-shi Nara, Japan 2 1 February 7.8 4.0× Tsuyama Okayama, Japan 2 1 February 7.7 4.0× Nantan Kyoto, Japan 2 1 February 7.6 4.0× Tatsuno Hyōgo, Japan 2 1 February 7.7 4.0× Sennan Osaka, Japan 2 1 February 7.5 4.0× Kainan Wakayama, Japan 2 1 February 7.5 4.0× Fukuchiyama Kyoto, Japan 2 31 January 6.9 4.0× Ise Mie, Japan 1 31 January 6.9 4.0× Takashima Shiga, Japan 1 31 January 6.6 4.0× Kizugawa Kyoto, Japan 2 1 February 8.1 3.9× Matsusaka Mie, Japan 1 31 January 7.4 3.9× Ayabe Kyoto, Japan 2 31 January 7.2 3.9× Takarazuka Hyōgo, Japan 2 31 January 7.1 3.9× Sugai Kyoto, Japan 2 1 February 8.9 3.8× Nishinomiya Hyōgo, Japan 2 1 February 7.7 3.8× Kameyama Mie, Japan 2 31 January 7.6 3.8× Kishiwada Osaka, Japan 2 1 February 9.0 3.7× Iwade Wakayama, Japan 2 1 February 8.3 3.7× Izumisano Osaka, Japan 2 1 February 8.2 3.7× Nishio Aichi, Japan 1 1 February 8.1 3.7× Okayama Okayama, Japan 2 1 February 7.9 3.7× Kobe Hyōgo, Japan 2 1 February 7.7 3.7× Kashiwara Nara, Japan 2 1 February 7.6 3.7× Kariya Aichi, Japan 1 1 February 7.5 3.7× Tanabe Wakayama, Japan 2 31 January 7.4 3.7× Ikaruga Hyōgo, Japan 2 1 February 7.4 3.7× Gobō Wakayama, Japan 1 31 January 7.3 3.7× Kakogawachō-honmachi Hyōgo, Japan 2 1 February 8.9 3.6× Aioi Hyōgo, Japan 2 31 January 8.8 3.6× Takamatsu Kagawa, Japan 2 1 February 8.6 3.6× Ono Hyōgo, Japan 2 1 February 8.0 3.6× Narutochō-mitsuishi Tokushima, Japan 2 1 February 7.7 3.6× Kinokawa Wakayama, Japan 2 1 February 7.4 3.6× Saikū Mie, Japan 1 31 January 7.3 3.6× Handa Aichi, Japan 1 1 February 7.2 3.6× Tenri Nara, Japan 2 1 February 9.7 3.5× Kariya Hyōgo, Japan 2 31 January 9.6 3.5× Amagasaki Hyōgo, Japan 2 1 February 9.2 3.5× Habikino Osaka, Japan 2 1 February 9.1 3.5× Hirakata Osaka, Japan 2 1 February 8.8 3.5× Akashi Hyōgo, Japan 2 1 February 8.8 3.5× Takahashi Okayama, Japan 2 31 January 8.6 3.5× Suzuka Mie, Japan 2 1 February 7.6 3.5× Sayama Osaka, Japan 2 1 February 7.6 3.5× Izumi Osaka, Japan 2 1 February 7.3 3.5× Kawachi-Nagano Osaka, Japan 1 31 January 7.1 3.5× Higashinozoe Hyōgo, Japan 2 1 February 10.3 3.4× Shido Kagawa, Japan 2 1 February 9.0 3.4× Minato Wakayama, Japan 2 1 February 8.8 3.4× Sōja Okayama, Japan 2 1 February 8.6 3.4× Hiragi Kagawa, Japan 1 1 February 7.9 3.4× Anan Tokushima, Japan 2 31 January 7.9 3.4× Asakuchi Okayama, Japan 2 1 February 9.6 3.3× Yao Osaka, Japan 2 31 January 9.5 3.3× Sandachō Hyōgo, Japan 2 31 January 9.4 3.3× Shin’ichi Hiroshima, Japan 2 31 January 9.1 3.3× Hōryūji Nara, Japan 2 1 February 9.0 3.3× Hayashima Okayama, Japan 2 1 February 8.8 3.3× Zentsujichó Kagawa, Japan 1 1 February 8.1 3.3× Tondabayashichō Osaka, Japan 2 1 February 7.9 3.3× Osaka Osaka, Japan 2 1 February 10.7 3.2× Higashiosaka Osaka, Japan 2 1 February 10.8 3.1× Imabari Ehime, Japan 1 1 February 9.0 3.1× Marugame Kagawa, Japan 1 1 February 8.7 3.1× Tamano Okayama, Japan 2 1 February 10.5 3.0× Kurashiki Okayama, Japan 2 1 February 10.5 3.0× Sakai Osaka, Japan 2 1 February 10.2 3.0× Kan’onjichō Kagawa, Japan 2 1 February 10.0 3.0× Kasaoka Okayama, Japan 2 1 February 9.6 3.0× Bizen Okayama, Japan 2 1 February 9.3 3.0× Hashimoto Wakayama, Japan 2 31 January 9.1 3.0× Tahara Aichi, Japan 1 1 February 9.0 3.0× Niihama Ehime, Japan 1 1 February 9.3 2.9× Fukuyama Hiroshima, Japan 2 1 February 10.9 2.8× Onomichi Hiroshima, Japan 2 1 February 10.9 2.8× Saijō Ehime, Japan 1 1 February 9.9 2.8× Dodong-ri Gyeongsangbuk-do, South Korea 1 31 January 11.9 2.7× Higashihiroshima Hiroshima, Japan 1 1 February 9.9 2.7× Shikokuchūō Ehime, Japan 1 1 February 10.5 2.4×
Daily means in µg/m³, over the days each city counted in this episode. Highest: its highest of those days. Usual: the city's median for the time of year of that day (its days within 21 days of the date, every year, leaving out the week around it). Above usual: its highest day against that, with a usual under 5 µg/m³ taken as 5.
Against other episodes in Japan and South Korea
Number 17 of 96 episodes in Japan and South Korea since our records began, by cities reached.
Japan and South Korea, June and July 2025 532 Japan and South Korea, April 2024 519 Japan and South Korea, March 2025 479 Japan and South Korea, March 2026 322 Japan and South Korea, 17 to 24 January 2025 285 Japan and South Korea, July 2026 205 Japan and South Korea, February and March 2025 200 South Korea and Japan, January 2026 176 South Korea and Japan, 10 to 15 February 2026 153 South Korea, 14 to 16 February 2025 136 Japan, November 2023 133 South Korea and Japan, November 2025 132 Japan and South Korea, 31 January to 1 February 2025 113 Bars: cities reached; colour: the level of the episode's highest daily reading. All 96 .
Use this page SmogRank, Japan and South Korea, 31 January to 1 February 2025: 113 cities with PM2.5 at twice their usual or more, 31 January to 1 February 2025, smogrank.com/episodes/2025-01-31-japan-and-south-korea (accessed 5 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.
