SmogRank / Episodes / Japan
Japan, February 2026
For 2 days, from 14 to 15 February 2026, 51 cities in Japan had PM2.5 at least twice their usual for the time of year. The worst reading was Ōdate, Akita, Japan: 40.1 µg/m³ on 14 February, about 6.7× its usual 6.0.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 51 in 1 country
Days 2 14 to 15 February 2026
Worst day 15 February 41 cities counted
Furthest above usual 6.7× Ōdate
Day by day
Play 15 February 41 cities at twice their usual or more
Anamizu Nanao Nyūzen Himimachi Uozu Imizu Namerikawa Takaoka Toyama Hakui Itoigawa Oyabe Tonami Tsubata Kanazawa Jōetsu Nonoichi Matsutō Nagano Chikuma Takayama Komatsu Suzaka Sado Matsumoto Kaga Ueda Okaya Gero Ono Suwa Mikuni Nagaoka Minamiuonuma Fukui-shi Maki Saku Ina Nakanojō Sabae Shirone Niigata Minokamo Sekimachi Niitsu-honchō Kameda-honchō Iida Numata Shibukawa Motosu Kani Kakamigahara Tomioka Ibi Gifu Inuyama Toki Tajimi Mizuho Tsuruga Ōgaki Ichinomiya Hashima Minami-Alps Seto Kofu Shibata Owariasahi Nagoya Nagahama Fuefuki Kodamachō-kodamaminami Ama Yamanashi Nisshin Honjō Kaizu Sakai-nakajima Toyota Chichibu Kiryū Takashima Yorii Hikone Inabe Tōkai Ōta Chiryū Kuwana Kariya Obama Ogawamachi Anjō Okazaki Menuma Ashikaga Ōtsuki Kumagaya Fujiyoshida Shinshiro Youkaichi Hekinan Morohongō Nishio Tokoname Ōmihachiman Imaichi Gyōda Gamagōri Tatebayashi Higashi-Matsuyama Ōme Fujinomiya Sano Uenohara Sakado Hannō Kitahama Hanyū Kaminoma Toyohashi Kōnosu Kanuma Hamakita Igusa Iruma Kōka Fuji Shizuoka Sayama Gotemba Kazo Kawagoe Tochigi Yokota Kusatsu Kosai Hachiōji Akishima Aizu-Wakamatsu Fujieda Minamichita Hamamatsu Kakegawa Maizuru Shimada Tokorozawa Aihara Iwata Tsu Ōtsu Higashimurayama Yaita Ageo Susono Miyazu Kukichūō Utsunomiya Minamiashigara Minawa Kodaira Niiza Higashikurume Kyoto Numazu Fuchū Kikugawa Hadano Kyōtango Asaka Kaminokawa Iga Nasushiobara Odawara Isehara Kasukabe Machida Nantan Atsugi Uji Ayabe Minamirinkan Izunokuni Kōtari Kameoka Noborito Saikū Yamato Atami Tsuruoka Jōyō Ayase Kawaguchi Azamino Yonezawa Hiratsuka Ebina Ise Koshigaya Yawata Chigasaki Tokyo Fukuchiyama Kizugawa Nabari Sugai Nasukarasuyama Takatsuki Fujisawa Yono Hirakata Shirakawa Toyooka Misato, Saitama Nara-shi Shima Yokohama Kamakura Matsudo Ikoma Kashiwa Tenri Kōriyama Toyonaka Hōryūji Urayasu Kasama Higashiosaka Shimoda Kamagaya Sagae Takarazuka Yokosuka Osaka Sandachō Yao Kashihara-shi Amagasaki Yamagata Fukushima Miura Hitachiomiya Kurihama Narashino Habikino Nishinomiya Kashiwara Inzai Nishiwaki Yachiyo Tondabayashichō Kimitsu Sakai Sayama Higashine Kisarazu Ajiki Mito Chiba Kawachi-Nagano Kobe Inashiki Ichihara Yotsukaidō Sodegaura Izumi Sakura Ono Hitachi-Naka Shiroishi Narita Kishiwada Hashimoto Owase Hitachi Hokota Yachimata Izumisano Tateyama Kitaibaraki Tottori-shi Minamibōsō Sawara Kakuda Ōami Kinokawa Himeji Tōgane Sennan Mobara Kumano Iwaki Yokoshiba Iwade Kashima-shi Ikaruga Iwanuma Omigawa Sōsa Sōma Akita Tatsuno Kamisu Natori-shi Sendai Minami-Sōma Yoshioka Aioi Katsuura Minato Ōhara Kainan Yokote Shingū Tagajō-shi Kariya Ōsaki Kurayoshi Matsushima Bizen Tsuyama Kurihara Gobō Wakuya Higashimatsushima Tanabe Narutochō-mitsuishi Tome Ichinoseki Ishinomaki Tokushima Okayama Ōshū Hanamaki Tamano Yonago Kamojimachō-jōgejima Sōja Sakaiminato Yoshinogawa Yasugichō Takahashi Niimi Mima Morioka Takinomiya Takizawa Kesennuma Matsue Ikedachō Unnan Shin’ichi Izumo Kamaishi Miyoshi Mihara Aki Miyako Ōdachō-ōda Nankoku Takehara Kuji Kochi Higashihiroshima Ino Yae Gōtsuchō Susaki Gion Kure Hiroshima Shinagawa Matsuyama Iyo Ōtake Iwakuni Yanai Yawatahama Saijō Asakuchi Shikokuchūō Niihama Shido Imabari Fukuyama Kasaoka Onomichi Takamatsu Anan Kakogawachō-honmachi Kurashiki Sōka Tahara Saitama Kameyama Kan’onjichō Marugame Higashinozoe Tsuchiura Yokkaichi Oyama Matsusaka Noda Shimo-tsuma Naka Chikusei Zentsujichó Hiragi Akashi Aomori Ishioka Jōsō Handa Suzuka Nagai Sumoto Bandō Toride Shinjō Koga Toba Yurihonjō Hirosaki Oga Mooka Shonai Hachinohe Noshiro Ōdate 11 Feb 12 13 14 15 16 17 18 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
Tsuchiura Tsuchiura, 11 February: 29.4 µg/m³, 3.5× usual Tsuchiura, 12 February: 17.4 µg/m³, 2.1× usual Tsuchiura, 13 February: 13.1 µg/m³, 1.6× usual Tsuchiura, 14 February: 22.1 µg/m³, 2.6× usual Tsuchiura, 15 February: 31.0 µg/m³, 3.7× usual Tsuchiura, 16 February: 25.2 µg/m³, 3.0× usual Tsuchiura, 17 February: 6.6 µg/m³, 0.8× usual Tsuchiura, 18 February: no reading Naka Naka, 11 February: 29.0 µg/m³, 4.4× usual Naka, 12 February: 13.8 µg/m³, 2.1× usual Naka, 13 February: 13.6 µg/m³, 2.1× usual Naka, 14 February: 19.5 µg/m³, 3.0× usual Naka, 15 February: 26.6 µg/m³, 4.0× usual Naka, 16 February: 23.0 µg/m³, 3.5× usual Naka, 17 February: 5.6 µg/m³, 0.8× usual Naka, 18 February: 11.0 µg/m³, 1.7× usual Shimo-tsuma Shimo-tsuma, 11 February: 28.9 µg/m³, 3.4× usual Shimo-tsuma, 12 February: 10.2 µg/m³, 1.2× usual Shimo-tsuma, 13 February: 12.4 µg/m³, 1.4× usual Shimo-tsuma, 14 February: 23.0 µg/m³, 2.7× usual Shimo-tsuma, 15 February: 33.9 µg/m³, 3.9× usual Shimo-tsuma, 16 February: 23.8 µg/m³, 2.8× usual Shimo-tsuma, 17 February: 5.7 µg/m³, 0.7× usual Shimo-tsuma, 18 February: 11.5 µg/m³, 1.3× usual Jōsō Jōsō, 11 February: 28.4 µg/m³, 4.1× usual Jōsō, 12 February: 9.8 µg/m³, 1.4× usual Jōsō, 13 February: 14.1 µg/m³, 2.0× usual Jōsō, 14 February: 21.7 µg/m³, 3.1× usual Jōsō, 15 February: 31.0 µg/m³, 4.5× usual Jōsō, 16 February: 24.7 µg/m³, 3.6× usual Jōsō, 17 February: 5.5 µg/m³, 0.8× usual Jōsō, 18 February: 10.6 µg/m³, 1.5× usual Toride Toride, 11 February: 27.6 µg/m³, 5.0× usual Toride, 12 February: 9.8 µg/m³, 1.8× usual Toride, 13 February: 13.9 µg/m³, 2.5× usual Toride, 14 February: 19.6 µg/m³, 3.6× usual Toride, 15 February: 27.1 µg/m³, 4.9× usual Toride, 16 February: 22.5 µg/m³, 4.1× usual Toride, 17 February: 5.5 µg/m³, 1.0× usual Toride, 18 February: 11.5 µg/m³, 2.1× usual Ōdate Ōdate, 11 February: 26.3 µg/m³, 4.4× usual Ōdate, 12 February: 9.5 µg/m³, 1.6× usual Ōdate, 13 February: 11.3 µg/m³, 1.9× usual Ōdate, 14 February: 40.1 µg/m³, 6.7× usual Ōdate, 15 February: 33.3 µg/m³, 5.6× usual Ōdate, 16 February: 11.2 µg/m³, 1.9× usual Ōdate, 17 February: 9.7 µg/m³, 1.6× usual Ōdate, 18 February: 9.4 µg/m³, 1.6× usual Noshiro Noshiro, 11 February: 21.3 µg/m³, 3.8× usual Noshiro, 12 February: 8.1 µg/m³, 1.4× usual Noshiro, 13 February: 8.6 µg/m³, 1.5× usual Noshiro, 14 February: 31.8 µg/m³, 5.7× usual Noshiro, 15 February: 23.0 µg/m³, 4.1× usual Noshiro, 16 February: 9.1 µg/m³, 1.6× usual Noshiro, 17 February: 6.6 µg/m³, 1.2× usual Noshiro, 18 February: 8.9 µg/m³, 1.6× usual Yurihonjō Yurihonjō, 11 February: 20.3 µg/m³, 3.3× usual Yurihonjō, 12 February: 11.3 µg/m³, 1.9× usual Yurihonjō, 13 February: 8.1 µg/m³, 1.3× usual Yurihonjō, 14 February: 31.1 µg/m³, 5.1× usual Yurihonjō, 15 February: 20.6 µg/m³, 3.4× usual Yurihonjō, 16 February: 11.0 µg/m³, 1.8× usual Yurihonjō, 17 February: 12.5 µg/m³, 2.0× usual Yurihonjō, 18 February: 9.9 µg/m³, 1.6× usual Aomori Aomori, 11 February: 19.4 µg/m³, 2.9× usual Aomori, 12 February: 7.3 µg/m³, 1.1× usual Aomori, 13 February: 6.9 µg/m³, 1.0× usual Aomori, 14 February: 29.0 µg/m³, 4.3× usual Aomori, 15 February: 20.2 µg/m³, 3.0× usual Aomori, 16 February: 8.7 µg/m³, 1.3× usual Aomori, 17 February: 5.7 µg/m³, 0.9× usual Aomori, 18 February: 6.4 µg/m³, 1.0× usual Hachinohe Hachinohe, 11 February: 17.7 µg/m³, 3.5× usual Hachinohe, 12 February: 6.7 µg/m³, 1.3× usual Hachinohe, 13 February: 6.6 µg/m³, 1.3× usual Hachinohe, 14 February: 28.7 µg/m³, 5.7× usual Hachinohe, 15 February: 23.9 µg/m³, 4.8× usual Hachinohe, 16 February: 8.8 µg/m³, 1.8× usual Hachinohe, 17 February: 7.1 µg/m³, 1.4× usual Hachinohe, 18 February: 7.6 µg/m³, 1.5× usual Oga Oga, 11 February: 22.2 µg/m³, 4.1× usual Oga, 12 February: 10.2 µg/m³, 1.9× usual Oga, 13 February: 8.7 µg/m³, 1.6× usual Oga, 14 February: 28.4 µg/m³, 5.3× usual Oga, 15 February: 24.0 µg/m³, 4.4× usual Oga, 16 February: 10.6 µg/m³, 2.0× usual Oga, 17 February: 9.1 µg/m³, 1.7× usual Oga, 18 February: 9.6 µg/m³, 1.8× usual Kasaoka Kasaoka, 11 February: 10.8 µg/m³, 1.3× usual Kasaoka, 12 February: no reading Kasaoka, 13 February: no reading Kasaoka, 14 February: 28.2 µg/m³, 3.3× usual Kasaoka, 15 February: 26.8 µg/m³, 3.2× usual Kasaoka, 16 February: 14.2 µg/m³, 1.7× usual Kasaoka, 17 February: 7.7 µg/m³, 0.9× usual Kasaoka, 18 February: 9.1 µg/m³, 1.1× usual Fukuyama Fukuyama, 11 February: 18.6 µg/m³, 2.0× usual Fukuyama, 12 February: 16.7 µg/m³, 1.8× usual Fukuyama, 13 February: 16.6 µg/m³, 1.8× usual Fukuyama, 14 February: 28.1 µg/m³, 3.0× usual Fukuyama, 15 February: 29.7 µg/m³, 3.2× usual Fukuyama, 16 February: 17.5 µg/m³, 1.9× usual Fukuyama, 17 February: 10.7 µg/m³, 1.1× usual Fukuyama, 18 February: 11.9 µg/m³, 1.3× usual Nagai Nagai, 11 February: 11.4 µg/m³, 1.8× usual Nagai, 12 February: 9.6 µg/m³, 1.5× usual Nagai, 13 February: 10.1 µg/m³, 1.6× usual Nagai, 14 February: 28.0 µg/m³, 4.5× usual Nagai, 15 February: 20.1 µg/m³, 3.2× usual Nagai, 16 February: 16.5 µg/m³, 2.7× usual Nagai, 17 February: 5.6 µg/m³, 0.9× usual Nagai, 18 February: 8.9 µg/m³, 1.4× usual Higashinozoe Higashinozoe, 11 February: 17.1 µg/m³, 1.9× usual Higashinozoe, 12 February: 22.8 µg/m³, 2.6× usual Higashinozoe, 13 February: 23.6 µg/m³, 2.7× usual Higashinozoe, 14 February: 27.6 µg/m³, 3.1× usual Higashinozoe, 15 February: 31.7 µg/m³, 3.6× usual Higashinozoe, 16 February: 21.7 µg/m³, 2.4× usual Higashinozoe, 17 February: 6.6 µg/m³, 0.7× usual Higashinozoe, 18 February: 10.9 µg/m³, 1.2× usual Shonai Shonai, 11 February: 17.3 µg/m³, 3.5× usual Shonai, 12 February: 7.8 µg/m³, 1.6× usual Shonai, 13 February: 6.6 µg/m³, 1.3× usual Shonai, 14 February: 27.5 µg/m³, 5.5× usual Shonai, 15 February: 17.5 µg/m³, 3.5× usual Shonai, 16 February: 9.9 µg/m³, 2.0× usual Shonai, 17 February: 7.2 µg/m³, 1.4× usual Shonai, 18 February: 8.6 µg/m³, 1.7× usual Onomichi Onomichi, 11 February: 21.4 µg/m³, 2.4× usual Onomichi, 12 February: 19.4 µg/m³, 2.2× usual Onomichi, 13 February: 18.7 µg/m³, 2.1× usual Onomichi, 14 February: 27.5 µg/m³, 3.1× usual Onomichi, 15 February: 29.8 µg/m³, 3.3× usual Onomichi, 16 February: 18.1 µg/m³, 2.0× usual Onomichi, 17 February: 10.7 µg/m³, 1.2× usual Onomichi, 18 February: 14.1 µg/m³, 1.6× usual Akashi Akashi, 11 February: 16.4 µg/m³, 2.1× usual Akashi, 12 February: 20.7 µg/m³, 2.6× usual Akashi, 13 February: 21.0 µg/m³, 2.7× usual Akashi, 14 February: 26.4 µg/m³, 3.3× usual Akashi, 15 February: 34.0 µg/m³, 4.3× usual Akashi, 16 February: 20.1 µg/m³, 2.5× usual Akashi, 17 February: 6.6 µg/m³, 0.8× usual Akashi, 18 February: 10.7 µg/m³, 1.4× usual Suzuka Suzuka, 11 February: 13.2 µg/m³, 1.9× usual Suzuka, 12 February: 17.0 µg/m³, 2.5× usual Suzuka, 13 February: 17.5 µg/m³, 2.5× usual Suzuka, 14 February: 26.2 µg/m³, 3.8× usual Suzuka, 15 February: 31.2 µg/m³, 4.5× usual Suzuka, 16 February: 17.8 µg/m³, 2.6× usual Suzuka, 17 February: 5.6 µg/m³, 0.8× usual Suzuka, 18 February: 6.4 µg/m³, 0.9× usual Hirosaki Hirosaki, 11 February: 18.0 µg/m³, 3.6× usual Hirosaki, 12 February: 6.9 µg/m³, 1.4× usual Hirosaki, 13 February: 8.0 µg/m³, 1.6× usual Hirosaki, 14 February: 26.0 µg/m³, 5.2× usual Hirosaki, 15 February: 21.0 µg/m³, 4.2× usual Hirosaki, 16 February: 9.2 µg/m³, 1.8× usual Hirosaki, 17 February: 6.8 µg/m³, 1.4× usual Hirosaki, 18 February: 7.0 µg/m³, 1.4× usual Shinjō Shinjō, 11 February: 14.7 µg/m³, 2.8× usual Shinjō, 12 February: 7.1 µg/m³, 1.4× usual Shinjō, 13 February: 7.5 µg/m³, 1.4× usual Shinjō, 14 February: 26.0 µg/m³, 5.0× usual Shinjō, 15 February: 16.0 µg/m³, 3.1× usual Shinjō, 16 February: 9.7 µg/m³, 1.9× usual Shinjō, 17 February: 8.5 µg/m³, 1.6× usual Shinjō, 18 February: 10.5 µg/m³, 2.0× usual Kakogawachō-honmachi Kakogawachō-honmachi, 11 February: 15.3 µg/m³, 2.0× usual Kakogawachō-honmachi, 12 February: 19.3 µg/m³, 2.5× usual Kakogawachō-honmachi, 13 February: 20.2 µg/m³, 2.7× usual Kakogawachō-honmachi, 14 February: 25.9 µg/m³, 3.4× usual Kakogawachō-honmachi, 15 February: 26.6 µg/m³, 3.5× usual Kakogawachō-honmachi, 16 February: 18.7 µg/m³, 2.5× usual Kakogawachō-honmachi, 17 February: 6.9 µg/m³, 0.9× usual Kakogawachō-honmachi, 18 February: 10.3 µg/m³, 1.4× usual Kan’onjichō Kan’onjichō, 11 February: 16.6 µg/m³, 1.8× usual Kan’onjichō, 12 February: 14.9 µg/m³, 1.6× usual Kan’onjichō, 13 February: 20.6 µg/m³, 2.3× usual Kan’onjichō, 14 February: 25.8 µg/m³, 2.8× usual Kan’onjichō, 15 February: 32.5 µg/m³, 3.6× usual Kan’onjichō, 16 February: 20.6 µg/m³, 2.3× usual Kan’onjichō, 17 February: 6.5 µg/m³, 0.7× usual Kan’onjichō, 18 February: 13.4 µg/m³, 1.5× usual Chikusei Chikusei, 11 February: 20.3 µg/m³, 2.6× usual Chikusei, 12 February: 12.7 µg/m³, 1.6× usual Chikusei, 13 February: 14.6 µg/m³, 1.9× usual Chikusei, 14 February: 20.8 µg/m³, 2.7× usual Chikusei, 15 February: 31.8 µg/m³, 4.1× usual Chikusei, 16 February: 21.3 µg/m³, 2.7× usual Chikusei, 17 February: 5.7 µg/m³, 0.7× usual Chikusei, 18 February: 12.0 µg/m³, 1.5× usual Bandō Bandō, 11 February: 14.3 µg/m³, 2.3× usual Bandō, 12 February: 7.3 µg/m³, 1.2× usual Bandō, 13 February: 11.5 µg/m³, 1.9× usual Bandō, 14 February: 17.2 µg/m³, 2.8× usual Bandō, 15 February: 30.3 µg/m³, 4.9× usual Bandō, 16 February: 14.4 µg/m³, 2.3× usual Bandō, 17 February: 6.2 µg/m³, 1.0× usual Bandō, 18 February: 9.3 µg/m³, 1.5× usual Oyama Oyama, 11 February: 18.9 µg/m³, 2.4× usual Oyama, 12 February: 10.8 µg/m³, 1.4× usual Oyama, 13 February: 13.4 µg/m³, 1.7× usual Oyama, 14 February: 19.9 µg/m³, 2.5× usual Oyama, 15 February: 30.3 µg/m³, 3.8× usual Oyama, 16 February: 18.8 µg/m³, 2.4× usual Oyama, 17 February: 6.6 µg/m³, 0.8× usual Oyama, 18 February: 12.3 µg/m³, 1.6× usual Kurashiki Kurashiki, 11 February: 16.5 µg/m³, 2.0× usual Kurashiki, 12 February: 16.7 µg/m³, 2.0× usual Kurashiki, 13 February: 19.8 µg/m³, 2.4× usual Kurashiki, 14 February: 24.1 µg/m³, 2.9× usual Kurashiki, 15 February: 29.3 µg/m³, 3.5× usual Kurashiki, 16 February: 18.9 µg/m³, 2.2× usual Kurashiki, 17 February: 9.5 µg/m³, 1.1× usual Kurashiki, 18 February: 12.0 µg/m³, 1.4× usual Mooka Mooka, 11 February: 15.5 µg/m³, 2.9× usual Mooka, 12 February: 7.4 µg/m³, 1.4× usual Mooka, 13 February: 9.5 µg/m³, 1.8× usual Mooka, 14 February: 17.9 µg/m³, 3.4× usual Mooka, 15 February: 28.8 µg/m³, 5.4× usual Mooka, 16 February: 17.5 µg/m³, 3.3× usual Mooka, 17 February: 4.1 µg/m³, 0.8× usual Mooka, 18 February: 9.2 µg/m³, 1.7× usual Koga Koga, 11 February: 14.4 µg/m³, 2.6× usual Koga, 12 February: 5.5 µg/m³, 1.0× usual Koga, 13 February: 11.4 µg/m³, 2.0× usual Koga, 14 February: 17.7 µg/m³, 3.2× usual Koga, 15 February: 28.5 µg/m³, 5.1× usual Koga, 16 February: 15.1 µg/m³, 2.7× usual Koga, 17 February: 5.0 µg/m³, 0.9× usual Koga, 18 February: 8.8 µg/m³, 1.6× usual Ishioka Ishioka, 11 February: 16.5 µg/m³, 2.6× usual Ishioka, 12 February: 10.4 µg/m³, 1.6× usual Ishioka, 13 February: 11.4 µg/m³, 1.8× usual Ishioka, 14 February: 23.8 µg/m³, 3.7× usual Ishioka, 15 February: 28.3 µg/m³, 4.4× usual Ishioka, 16 February: 16.0 µg/m³, 2.5× usual Ishioka, 17 February: 5.7 µg/m³, 0.9× usual Ishioka, 18 February: 11.3 µg/m³, 1.8× usual Takamatsu Takamatsu, 11 February: 19.7 µg/m³, 2.3× usual Takamatsu, 12 February: 19.3 µg/m³, 2.3× usual Takamatsu, 13 February: 19.0 µg/m³, 2.2× usual Takamatsu, 14 February: 20.7 µg/m³, 2.4× usual Takamatsu, 15 February: 28.2 µg/m³, 3.3× usual Takamatsu, 16 February: 25.5 µg/m³, 3.0× usual Takamatsu, 17 February: 7.6 µg/m³, 0.9× usual Takamatsu, 18 February: 12.8 µg/m³, 1.5× usual Shikokuchūō Shikokuchūō, 11 February: 16.6 µg/m³, 1.8× usual Shikokuchūō, 12 February: 14.3 µg/m³, 1.5× usual Shikokuchūō, 13 February: 14.3 µg/m³, 1.5× usual Shikokuchūō, 14 February: 17.3 µg/m³, 1.8× usual Shikokuchūō, 15 February: 27.8 µg/m³, 3.0× usual Shikokuchūō, 16 February: 20.0 µg/m³, 2.1× usual Shikokuchūō, 17 February: 7.7 µg/m³, 0.8× usual Shikokuchūō, 18 February: 9.8 µg/m³, 1.0× usual Tahara Tahara, 11 February: 20.1 µg/m³, 2.5× usual Tahara, 12 February: 18.2 µg/m³, 2.3× usual Tahara, 13 February: 22.4 µg/m³, 2.8× usual Tahara, 14 February: 23.2 µg/m³, 2.9× usual Tahara, 15 February: 27.6 µg/m³, 3.5× usual Tahara, 16 February: 22.1 µg/m³, 2.8× usual Tahara, 17 February: 8.7 µg/m³, 1.1× usual Tahara, 18 February: 11.6 µg/m³, 1.5× usual Handa Handa, 11 February: 11.9 µg/m³, 2.0× usual Handa, 12 February: 14.8 µg/m³, 2.4× usual Handa, 13 February: 17.0 µg/m³, 2.8× usual Handa, 14 February: 24.2 µg/m³, 4.0× usual Handa, 15 February: 27.5 µg/m³, 4.5× usual Handa, 16 February: 15.2 µg/m³, 2.5× usual Handa, 17 February: 6.8 µg/m³, 1.1× usual Handa, 18 February: 7.0 µg/m³, 1.1× usual Niihama Niihama, 11 February: 15.2 µg/m³, 1.6× usual Niihama, 12 February: 12.5 µg/m³, 1.3× usual Niihama, 13 February: 12.0 µg/m³, 1.3× usual Niihama, 14 February: 17.4 µg/m³, 1.9× usual Niihama, 15 February: 27.5 µg/m³, 3.0× usual Niihama, 16 February: 15.8 µg/m³, 1.7× usual Niihama, 17 February: 8.4 µg/m³, 0.9× usual Niihama, 18 February: 9.2 µg/m³, 1.0× usual Sumoto Sumoto, 11 February: 15.4 µg/m³, 2.7× usual Sumoto, 12 February: 17.5 µg/m³, 3.1× usual Sumoto, 13 February: 17.0 µg/m³, 3.0× usual Sumoto, 14 February: 22.4 µg/m³, 3.9× usual Sumoto, 15 February: 27.3 µg/m³, 4.8× usual Sumoto, 16 February: 24.2 µg/m³, 4.2× usual Sumoto, 17 February: 5.4 µg/m³, 0.9× usual Sumoto, 18 February: 8.0 µg/m³, 1.4× usual Zentsujichó Zentsujichó, 11 February: 13.2 µg/m³, 2.0× usual Zentsujichó, 12 February: 15.3 µg/m³, 2.3× usual Zentsujichó, 13 February: 14.6 µg/m³, 2.2× usual Zentsujichó, 14 February: 20.5 µg/m³, 3.1× usual Zentsujichó, 15 February: 27.2 µg/m³, 4.1× usual Zentsujichó, 16 February: 22.2 µg/m³, 3.4× usual Zentsujichó, 17 February: 6.3 µg/m³, 1.0× usual Zentsujichó, 18 February: 9.3 µg/m³, 1.4× usual Imabari Imabari, 11 February: 14.5 µg/m³, 1.7× usual Imabari, 12 February: 14.0 µg/m³, 1.6× usual Imabari, 13 February: 14.1 µg/m³, 1.6× usual Imabari, 14 February: 24.6 µg/m³, 2.8× usual Imabari, 15 February: 27.2 µg/m³, 3.1× usual Imabari, 16 February: 16.1 µg/m³, 1.9× usual Imabari, 17 February: 7.6 µg/m³, 0.9× usual Imabari, 18 February: 9.1 µg/m³, 1.0× usual Hiragi Hiragi, 11 February: 14.5 µg/m³, 2.2× usual Hiragi, 12 February: 15.5 µg/m³, 2.4× usual Hiragi, 13 February: 12.5 µg/m³, 1.9× usual Hiragi, 14 February: 17.8 µg/m³, 2.7× usual Hiragi, 15 February: 27.1 µg/m³, 4.2× usual Hiragi, 16 February: 18.5 µg/m³, 2.8× usual Hiragi, 17 February: 5.8 µg/m³, 0.9× usual Hiragi, 18 February: 8.2 µg/m³, 1.3× usual Noda Noda, 11 February: 21.3 µg/m³, 3.1× usual Noda, 12 February: 9.5 µg/m³, 1.4× usual Noda, 13 February: 16.0 µg/m³, 2.3× usual Noda, 14 February: 20.6 µg/m³, 3.0× usual Noda, 15 February: 27.0 µg/m³, 3.9× usual Noda, 16 February: 20.1 µg/m³, 2.9× usual Noda, 17 February: 7.1 µg/m³, 1.0× usual Noda, 18 February: 12.7 µg/m³, 1.8× usual Saijō Saijō, 11 February: 15.4 µg/m³, 1.6× usual Saijō, 12 February: 13.8 µg/m³, 1.4× usual Saijō, 13 February: 13.6 µg/m³, 1.4× usual Saijō, 14 February: 21.7 µg/m³, 2.2× usual Saijō, 15 February: 26.9 µg/m³, 2.7× usual Saijō, 16 February: 17.6 µg/m³, 1.8× usual Saijō, 17 February: 9.7 µg/m³, 1.0× usual Saijō, 18 February: 9.7 µg/m³, 1.0× usual Asakuchi Asakuchi, 11 February: 16.0 µg/m³, 1.8× usual Asakuchi, 12 February: 16.2 µg/m³, 1.8× usual Asakuchi, 13 February: 16.5 µg/m³, 1.9× usual Asakuchi, 14 February: 23.0 µg/m³, 2.6× usual Asakuchi, 15 February: 26.4 µg/m³, 3.0× usual Asakuchi, 16 February: 17.0 µg/m³, 1.9× usual Asakuchi, 17 February: 8.6 µg/m³, 1.0× usual Asakuchi, 18 February: 11.5 µg/m³, 1.3× usual Yokkaichi Yokkaichi, 11 February: 10.4 µg/m³, 1.4× usual Yokkaichi, 12 February: 16.7 µg/m³, 2.3× usual Yokkaichi, 13 February: 17.3 µg/m³, 2.4× usual Yokkaichi, 14 February: 23.3 µg/m³, 3.2× usual Yokkaichi, 15 February: 26.3 µg/m³, 3.7× usual Yokkaichi, 16 February: 18.9 µg/m³, 2.6× usual Yokkaichi, 17 February: 6.6 µg/m³, 0.9× usual Yokkaichi, 18 February: 8.3 µg/m³, 1.2× usual Shido Shido, 11 February: 20.9 µg/m³, 2.4× usual Shido, 12 February: 20.5 µg/m³, 2.4× usual Shido, 13 February: 19.1 µg/m³, 2.2× usual Shido, 14 February: 23.9 µg/m³, 2.7× usual Shido, 15 February: 26.2 µg/m³, 3.0× usual Shido, 16 February: 25.7 µg/m³, 3.0× usual Shido, 17 February: 7.5 µg/m³, 0.9× usual Shido, 18 February: 11.9 µg/m³, 1.4× usual Kameyama Kameyama, 11 February: 9.2 µg/m³, 1.3× usual Kameyama, 12 February: 18.0 µg/m³, 2.5× usual Kameyama, 13 February: 17.7 µg/m³, 2.5× usual Kameyama, 14 February: 22.0 µg/m³, 3.1× usual Kameyama, 15 February: 25.9 µg/m³, 3.6× usual Kameyama, 16 February: 18.8 µg/m³, 2.6× usual Kameyama, 17 February: 5.0 µg/m³, 0.7× usual Kameyama, 18 February: 7.9 µg/m³, 1.1× usual Matsusaka Matsusaka, 11 February: 12.0 µg/m³, 1.8× usual Matsusaka, 12 February: 15.6 µg/m³, 2.3× usual Matsusaka, 13 February: 18.4 µg/m³, 2.7× usual Matsusaka, 14 February: 21.2 µg/m³, 3.2× usual Matsusaka, 15 February: 25.8 µg/m³, 3.9× usual Matsusaka, 16 February: 16.5 µg/m³, 2.5× usual Matsusaka, 17 February: 6.1 µg/m³, 0.9× usual Matsusaka, 18 February: 8.9 µg/m³, 1.3× usual Marugame Marugame, 11 February: 14.3 µg/m³, 2.0× usual Marugame, 12 February: 14.8 µg/m³, 2.1× usual Marugame, 13 February: 14.3 µg/m³, 2.0× usual Marugame, 14 February: 19.0 µg/m³, 2.6× usual Marugame, 15 February: 25.6 µg/m³, 3.6× usual Marugame, 16 February: 20.5 µg/m³, 2.8× usual Marugame, 17 February: 6.6 µg/m³, 0.9× usual Marugame, 18 February: 10.9 µg/m³, 1.5× usual Toba Toba, 11 February: 12.1 µg/m³, 2.4× usual Toba, 12 February: 15.1 µg/m³, 3.0× usual Toba, 13 February: 18.0 µg/m³, 3.6× usual Toba, 14 February: 18.0 µg/m³, 3.6× usual Toba, 15 February: 25.4 µg/m³, 5.1× usual Toba, 16 February: 17.6 µg/m³, 3.5× usual Toba, 17 February: 4.6 µg/m³, 0.9× usual Toba, 18 February: 7.3 µg/m³, 1.5× usual Anan Anan, 11 February: 7.8 µg/m³, 1.1× usual Anan, 12 February: 14.6 µg/m³, 2.0× usual Anan, 13 February: 16.2 µg/m³, 2.3× usual Anan, 14 February: 13.6 µg/m³, 1.9× usual Anan, 15 February: 25.3 µg/m³, 3.5× usual Anan, 16 February: 20.7 µg/m³, 2.9× usual Anan, 17 February: 4.5 µg/m³, 0.6× usual Anan, 18 February: 9.7 µg/m³, 1.3× usual Saitama Saitama, 11 February: 15.0 µg/m³, 2.1× usual Saitama, 12 February: 9.1 µg/m³, 1.3× usual Saitama, 13 February: 14.5 µg/m³, 2.1× usual Saitama, 14 February: 18.5 µg/m³, 2.6× usual Saitama, 15 February: 25.1 µg/m³, 3.6× usual Saitama, 16 February: 14.8 µg/m³, 2.1× usual Saitama, 17 February: 7.1 µg/m³, 1.0× usual Saitama, 18 February: 12.2 µg/m³, 1.7× usual Sōka Sōka, 11 February: 19.7 µg/m³, 2.7× usual Sōka, 12 February: 11.3 µg/m³, 1.6× usual Sōka, 13 February: 14.8 µg/m³, 2.1× usual Sōka, 14 February: 19.5 µg/m³, 2.7× usual Sōka, 15 February: 25.0 µg/m³, 3.5× usual Sōka, 16 February: 16.9 µg/m³, 2.3× usual Sōka, 17 February: 5.8 µg/m³, 0.8× usual Sōka, 18 February: 12.7 µg/m³, 1.8× usual 11 Feb 12 13 14 15 16 17 18 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
Ōdate Akita, Japan 1 14 February 6.0 6.7× Hachinohe Aomori, Japan 1 14 February 5.0 5.7× Noshiro Akita, Japan 1 14 February 5.6 5.7× Shonai Yamagata, Japan 1 14 February 4.3 5.5× Mooka Tochigi, Japan 1 15 February 5.3 5.4× Oga Akita, Japan 1 14 February 5.4 5.3× Hirosaki Aomori, Japan 1 14 February 4.9 5.2× Yurihonjō Akita, Japan 1 14 February 6.1 5.1× Koga Ibaraki, Japan 1 15 February 5.6 5.1× Toba Mie, Japan 1 15 February 4.8 5.1× Toride Ibaraki, Japan 1 11 February 5.5 5.0× Shinjō Yamagata, Japan 1 14 February 5.2 5.0× Bandō Ibaraki, Japan 1 15 February 6.2 4.9× Sumoto Hyōgo, Japan 1 15 February 5.7 4.8× Suzuka Mie, Japan 1 15 February 6.9 4.5× Nagai Yamagata, Japan 1 14 February 6.2 4.5× Handa Aichi, Japan 1 15 February 6.1 4.5× Jōsō Ibaraki, Japan 1 15 February 6.9 4.5× Ishioka Ibaraki, Japan 1 15 February 6.4 4.4× Naka Ibaraki, Japan 1 11 February 6.6 4.4× Aomori Aomori, Japan 1 14 February 6.7 4.3× Akashi Hyōgo, Japan 1 15 February 7.9 4.3× Hiragi Kagawa, Japan 1 15 February 6.5 4.2× Zentsujichó Kagawa, Japan 1 15 February 6.6 4.1× Chikusei Ibaraki, Japan 1 15 February 7.8 4.1× Shimo-tsuma Ibaraki, Japan 1 15 February 8.6 3.9× Noda Chiba, Japan 1 15 February 6.9 3.9× Matsusaka Mie, Japan 1 15 February 6.7 3.9× Oyama Tochigi, Japan 1 15 February 7.9 3.8× Tsuchiura Ibaraki, Japan 1 15 February 8.4 3.7× Yokkaichi Mie, Japan 1 15 February 7.2 3.7× Kameyama Mie, Japan 1 15 February 7.1 3.6× Saitama Saitama, Japan 1 15 February 7.0 3.6× Kan’onjichō Kagawa, Japan 1 15 February 9.1 3.6× Higashinozoe Hyōgo, Japan 1 15 February 8.9 3.6× Marugame Kagawa, Japan 1 15 February 7.2 3.6× Anan Tokushima, Japan 1 15 February 7.2 3.5× Kakogawachō-honmachi Hyōgo, Japan 1 15 February 7.6 3.5× Kurashiki Okayama, Japan 1 15 February 8.4 3.5× Sōka Saitama, Japan 1 15 February 7.2 3.5× Tahara Aichi, Japan 1 15 February 8.0 3.5× Takamatsu Kagawa, Japan 1 15 February 8.5 3.3× Kasaoka Okayama, Japan 1 14 February 8.5 3.3× Onomichi Hiroshima, Japan 1 15 February 9.0 3.3× Fukuyama Hiroshima, Japan 1 15 February 9.4 3.2× Imabari Ehime, Japan 1 15 February 8.7 3.1× Shido Kagawa, Japan 1 15 February 8.7 3.0× Asakuchi Okayama, Japan 1 15 February 8.8 3.0× Shikokuchūō Ehime, Japan 1 15 February 9.4 3.0× Niihama Ehime, Japan 1 15 February 9.3 3.0× Saijō Ehime, Japan 1 15 February 9.8 2.7×
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 14 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 Japan, February 2026 51 Bars: cities reached; colour: the level of the episode's highest daily reading. All 27 .
Use this page SmogRank, Japan, February 2026: 51 cities with PM2.5 at twice their usual or more, 14 to 15 February 2026, smogrank.com/episodes/2026-02-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.
