SmogRank / Episodes / Japan
Japan, July 2026
For 1 day, on 16 July 2026, 41 cities in Japan had PM2.5 at least twice their usual for the time of year. The worst reading was Hokota, Ibaraki, Japan: 33.6 µg/m³ on 16 July, about 4.1× its usual 8.1.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 41 in 1 country
Days 1 16 July 2026
Worst day 16 July 41 cities counted
Furthest above usual 4.1× Hokota
Day by day
Play 16 July 41 cities at twice their usual or more
Sayama Iruma Hannō Tokorozawa Sakado Kawagoe Yokota Morohongō Igusa Higashimurayama Akishima Higashikurume Kodaira Niiza Higashi-Matsuyama Ōme Fuchū Asaka Ogawamachi Kōnosu Ageo Saitama Kumagaya Gyōda Kawaguchi Kazo Yorii Hanyū Tokyo Kukichūō Chichibu Minawa Menuma Kasukabe Minamirinkan Uenohara Koshigaya Yamato Sōka Tatebayashi Kodamachō-kodamaminami Atsugi Honjō Sakai-nakajima Ōta Koga Ashikaga Noda Ebina Misato, Saitama Sano Ōtsuki Matsudo Bandō Fujisawa Kiryū Kamakura Kashiwa Oyama Kamagaya Minamiashigara Tochigi Tomioka Yokosuka Narashino Kimitsu Kurihama Yamanashi Fujiyoshida Chikusei Shibukawa Miura Kanuma Inzai Sodegaura Kaminokawa Fuefuki Yotsukaidō Ajiki Mooka Numata Susono Utsunomiya Kofu Imaichi Nakanojō Narita Ishioka Yachimata Ōami Saku Minamibōsō Tateyama Fuji Tōgane Yaita Nasukarasuyama Sawara Yokoshiba Sōsa Katsuura Ōhara Omigawa Hitachiomiya Ueda Nasushiobara Suwa Minamiuonuma Suzaka Shizuoka Okaya Nagano Hitachi Chikuma Matsumoto Shirakawa Shimada Iida Kitaibaraki Nagaoka Aizu-Wakamatsu Kikugawa Jōetsu Kakegawa Kōriyama Hamakita Shirone Iwata Itoigawa Maki Niitsu-honchō Kameda-honchō Hamamatsu Shibata Niigata Shinshiro Takayama Fukushima Gero Yonezawa Nyūzen Kosai Uozu Namerikawa Toki Toyohashi Nagai Tajimi Toyama Minami-Sōma Toyota Seto Kani Gamagōri Sado Minokamo Okazaki Tahara Imizu Nisshin Owariasahi Sōma Shiroishi Anjō Inuyama Sekimachi Kakuda Chiryū Takaoka Nishio Yamagata Tonami Kariya Kakamigahara Nagoya Hekinan Himimachi Tōkai Handa Ichinomiya Minamichita Oyabe Iwanuma Gifu Ama Nanao Tokoname Natori-shi Kaminoma Motosu Mizuho Hashima Tsubata Hakui Sendai Ōgaki Kaizu Kuwana Anamizu Ibi Nonoichi Kanazawa Toba Matsutō Ono Tagajō-shi Yokkaichi Inabe Suzuka Shima Komatsu Ise Saikū Tsu Kaga Kameyama Matsusaka Nagahama Fukui-shi Hikone Sabae Mikuni Youkaichi Tsuruga Kōka Ōmihachiman Takashima Iga Ueno-ebisumachi Kusatsu Nabari Kitahama Ōtsu Owase Obama Uji Kizugawa Jōyō Kyoto Sugai Nara-shi Tenri Kōtari Kumano Yawata Kashihara-shi Hōryūji Ikoma Hirakata Kashiwara Kameoka Takatsuki Nantan Yao Higashiosaka Yono Shingū Habikino Tondabayashichō Sayama Osaka Kawachi-Nagano Toyonaka Hashimoto Maizuru Sakai Amagasaki Takarazuka Ayabe Izumi Miyazu Nishinomiya Kishiwada Sandachō Kinokawa Fukuchiyama Izumisano Kyōtango Kobe Iwade Sennan Nishiwaki Kainan Akashi Minato Tanabe Ono Toyooka Higashinozoe Gobō Kakogawachō-honmachi Sumoto Himeji Ikaruga Tatsuno Aioi Narutochō-mitsuishi Anan Kariya Tokushima Aihara Fujinomiya Iwaki Gotemba Hachiōji Hadano Minami-Alps Noborito Tsuchiura Fukuroi Machida Ayase Azamino Mito Atami Yachiyo Kasama Chigasaki Hiratsuka Yokohama Kamisu Isehara Odawara Shimo-tsuma Naka Fujieda Shimoda Inashiki Kisarazu Urayasu Jōsō Chiba Toride Kashima-shi Numazu Hitachi-Naka Sakura Mobara Izunokuni Ichihara Hokota 13 Jul 14 15 16 17 18 19 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
Fukuroi Fukuroi, 13 July: 14.6 µg/m³, 1.5× usual Fukuroi, 14 July: 25.5 µg/m³, 2.6× usual Fukuroi, 15 July: 16.8 µg/m³, 1.7× usual Fukuroi, 16 July: 26.7 µg/m³, 2.7× usual Fukuroi, 17 July: 21.3 µg/m³, 2.2× usual Fukuroi, 18 July: 6.2 µg/m³, 0.6× usual Fukuroi, 19 July: 6.9 µg/m³, 0.7× usual Hokota Hokota, 13 July: 24.5 µg/m³, 3.0× usual Hokota, 14 July: 15.2 µg/m³, 1.9× usual Hokota, 15 July: 19.5 µg/m³, 2.4× usual Hokota, 16 July: 33.6 µg/m³, 4.1× usual Hokota, 17 July: 20.2 µg/m³, 2.5× usual Hokota, 18 July: 3.6 µg/m³, 0.4× usual Hokota, 19 July: 3.7 µg/m³, 0.5× usual Tsuchiura Tsuchiura, 13 July: 21.3 µg/m³, 1.8× usual Tsuchiura, 14 July: 16.0 µg/m³, 1.3× usual Tsuchiura, 15 July: 23.7 µg/m³, 2.0× usual Tsuchiura, 16 July: 32.6 µg/m³, 2.7× usual Tsuchiura, 17 July: 24.5 µg/m³, 2.0× usual Tsuchiura, 18 July: 6.7 µg/m³, 0.6× usual Tsuchiura, 19 July: 8.0 µg/m³, 0.7× usual Ayase Ayase, 13 July: 18.4 µg/m³, 1.6× usual Ayase, 14 July: 19.3 µg/m³, 1.7× usual Ayase, 15 July: 18.1 µg/m³, 1.6× usual Ayase, 16 July: 31.5 µg/m³, 2.8× usual Ayase, 17 July: 16.6 µg/m³, 1.5× usual Ayase, 18 July: 5.5 µg/m³, 0.5× usual Ayase, 19 July: 4.4 µg/m³, 0.4× usual Kamisu Kamisu, 13 July: 19.2 µg/m³, 1.9× usual Kamisu, 14 July: 16.6 µg/m³, 1.6× usual Kamisu, 15 July: 19.4 µg/m³, 1.9× usual Kamisu, 16 July: 31.3 µg/m³, 3.0× usual Kamisu, 17 July: 17.2 µg/m³, 1.7× usual Kamisu, 18 July: 7.0 µg/m³, 0.7× usual Kamisu, 19 July: 4.2 µg/m³, 0.4× usual Izunokuni Izunokuni, 13 July: 16.0 µg/m³, 1.9× usual Izunokuni, 14 July: 16.4 µg/m³, 1.9× usual Izunokuni, 15 July: 17.3 µg/m³, 2.0× usual Izunokuni, 16 July: 30.7 µg/m³, 3.6× usual Izunokuni, 17 July: 22.9 µg/m³, 2.7× usual Izunokuni, 18 July: 2.9 µg/m³, 0.3× usual Izunokuni, 19 July: 1.5 µg/m³, 0.2× usual Gotemba Gotemba, 13 July: 15.8 µg/m³, 1.4× usual Gotemba, 14 July: 15.5 µg/m³, 1.4× usual Gotemba, 15 July: 17.8 µg/m³, 1.6× usual Gotemba, 16 July: 30.1 µg/m³, 2.6× usual Gotemba, 17 July: 22.3 µg/m³, 2.0× usual Gotemba, 18 July: 7.7 µg/m³, 0.7× usual Gotemba, 19 July: 2.8 µg/m³, 0.2× usual Naka Naka, 13 July: 21.0 µg/m³, 2.1× usual Naka, 14 July: 16.8 µg/m³, 1.7× usual Naka, 15 July: 18.1 µg/m³, 1.8× usual Naka, 16 July: 30.0 µg/m³, 3.1× usual Naka, 17 July: 20.9 µg/m³, 2.1× usual Naka, 18 July: 6.0 µg/m³, 0.6× usual Naka, 19 July: 5.5 µg/m³, 0.6× usual Kashima-shi Kashima-shi, 13 July: 18.5 µg/m³, 2.1× usual Kashima-shi, 14 July: 16.3 µg/m³, 1.9× usual Kashima-shi, 15 July: 19.7 µg/m³, 2.2× usual Kashima-shi, 16 July: 29.2 µg/m³, 3.3× usual Kashima-shi, 17 July: 13.2 µg/m³, 1.5× usual Kashima-shi, 18 July: 7.6 µg/m³, 0.9× usual Kashima-shi, 19 July: 5.8 µg/m³, 0.7× usual Iwaki Iwaki, 13 July: 11.5 µg/m³, 1.0× usual Iwaki, 14 July: 14.1 µg/m³, 1.2× usual Iwaki, 15 July: 18.1 µg/m³, 1.6× usual Iwaki, 16 July: 29.2 µg/m³, 2.6× usual Iwaki, 17 July: 12.5 µg/m³, 1.1× usual Iwaki, 18 July: 4.1 µg/m³, 0.4× usual Iwaki, 19 July: 5.8 µg/m³, 0.5× usual Hachiōji Hachiōji, 13 July: 16.8 µg/m³, 1.5× usual Hachiōji, 14 July: 17.5 µg/m³, 1.6× usual Hachiōji, 15 July: 21.6 µg/m³, 2.0× usual Hachiōji, 16 July: 28.8 µg/m³, 2.6× usual Hachiōji, 17 July: 21.4 µg/m³, 2.0× usual Hachiōji, 18 July: 7.3 µg/m³, 0.7× usual Hachiōji, 19 July: 4.5 µg/m³, 0.4× usual Chigasaki Chigasaki, 13 July: 15.9 µg/m³, 1.6× usual Chigasaki, 14 July: 17.8 µg/m³, 1.8× usual Chigasaki, 15 July: 16.4 µg/m³, 1.7× usual Chigasaki, 16 July: 28.6 µg/m³, 2.9× usual Chigasaki, 17 July: 19.7 µg/m³, 2.0× usual Chigasaki, 18 July: 5.3 µg/m³, 0.5× usual Chigasaki, 19 July: 3.3 µg/m³, 0.3× usual Chiba Chiba, 13 July: 16.3 µg/m³, 1.9× usual Chiba, 14 July: 15.6 µg/m³, 1.8× usual Chiba, 15 July: 16.8 µg/m³, 2.0× usual Chiba, 16 July: 28.5 µg/m³, 3.3× usual Chiba, 17 July: 17.5 µg/m³, 2.0× usual Chiba, 18 July: 4.0 µg/m³, 0.5× usual Chiba, 19 July: 5.0 µg/m³, 0.6× usual Shimo-tsuma Shimo-tsuma, 13 July: 18.8 µg/m³, 2.0× usual Shimo-tsuma, 14 July: 16.8 µg/m³, 1.8× usual Shimo-tsuma, 15 July: 18.9 µg/m³, 2.0× usual Shimo-tsuma, 16 July: 28.4 µg/m³, 3.0× usual Shimo-tsuma, 17 July: 19.4 µg/m³, 2.0× usual Shimo-tsuma, 18 July: 5.5 µg/m³, 0.6× usual Shimo-tsuma, 19 July: 5.3 µg/m³, 0.6× usual Aihara Aihara, 13 July: 17.1 µg/m³, 1.4× usual Aihara, 14 July: 16.5 µg/m³, 1.4× usual Aihara, 15 July: 19.0 µg/m³, 1.6× usual Aihara, 16 July: 28.3 µg/m³, 2.4× usual Aihara, 17 July: 21.1 µg/m³, 1.8× usual Aihara, 18 July: 7.6 µg/m³, 0.6× usual Aihara, 19 July: 4.8 µg/m³, 0.4× usual Jōsō Jōsō, 13 July: 20.8 µg/m³, 2.5× usual Jōsō, 14 July: 18.3 µg/m³, 2.2× usual Jōsō, 15 July: 18.0 µg/m³, 2.2× usual Jōsō, 16 July: 27.6 µg/m³, 3.3× usual Jōsō, 17 July: 19.6 µg/m³, 2.4× usual Jōsō, 18 July: 3.4 µg/m³, 0.4× usual Jōsō, 19 July: 5.2 µg/m³, 0.6× usual Ichihara Ichihara, 13 July: 17.1 µg/m³, 2.3× usual Ichihara, 14 July: 14.1 µg/m³, 1.9× usual Ichihara, 15 July: 15.4 µg/m³, 2.0× usual Ichihara, 16 July: 27.4 µg/m³, 3.6× usual Ichihara, 17 July: 16.8 µg/m³, 2.2× usual Ichihara, 18 July: 4.2 µg/m³, 0.6× usual Ichihara, 19 July: 3.9 µg/m³, 0.5× usual Numazu Numazu, 13 July: 17.7 µg/m³, 2.1× usual Numazu, 14 July: 15.3 µg/m³, 1.8× usual Numazu, 15 July: 17.7 µg/m³, 2.1× usual Numazu, 16 July: 27.1 µg/m³, 3.3× usual Numazu, 17 July: 24.4 µg/m³, 2.9× usual Numazu, 18 July: 8.5 µg/m³, 1.0× usual Numazu, 19 July: 4.3 µg/m³, 0.5× usual Hitachi-Naka Hitachi-Naka, 13 July: 15.0 µg/m³, 1.9× usual Hitachi-Naka, 14 July: 14.6 µg/m³, 1.8× usual Hitachi-Naka, 15 July: 19.6 µg/m³, 2.5× usual Hitachi-Naka, 16 July: 27.0 µg/m³, 3.4× usual Hitachi-Naka, 17 July: 11.8 µg/m³, 1.5× usual Hitachi-Naka, 18 July: 4.1 µg/m³, 0.5× usual Hitachi-Naka, 19 July: 4.5 µg/m³, 0.6× usual Kasama Kasama, 13 July: 16.7 µg/m³, 1.8× usual Kasama, 14 July: no reading Kasama, 15 July: 18.7 µg/m³, 2.0× usual Kasama, 16 July: 27.0 µg/m³, 2.9× usual Kasama, 17 July: 16.5 µg/m³, 1.8× usual Kasama, 18 July: 5.1 µg/m³, 0.5× usual Kasama, 19 July: 6.7 µg/m³, 0.7× usual Sakura Sakura, 13 July: 17.7 µg/m³, 2.2× usual Sakura, 14 July: 17.5 µg/m³, 2.2× usual Sakura, 15 July: 16.8 µg/m³, 2.1× usual Sakura, 16 July: 26.9 µg/m³, 3.4× usual Sakura, 17 July: 14.7 µg/m³, 1.9× usual Sakura, 18 July: 3.8 µg/m³, 0.5× usual Sakura, 19 July: 5.7 µg/m³, 0.7× usual Odawara Odawara, 13 July: 15.3 µg/m³, 1.7× usual Odawara, 14 July: 17.5 µg/m³, 1.9× usual Odawara, 15 July: 16.7 µg/m³, 1.9× usual Odawara, 16 July: 26.7 µg/m³, 3.0× usual Odawara, 17 July: 21.4 µg/m³, 2.4× usual Odawara, 18 July: 5.3 µg/m³, 0.6× usual Odawara, 19 July: 4.4 µg/m³, 0.5× usual Isehara Isehara, 13 July: 17.5 µg/m³, 2.0× usual Isehara, 14 July: 16.5 µg/m³, 1.9× usual Isehara, 15 July: 17.4 µg/m³, 2.0× usual Isehara, 16 July: 26.5 µg/m³, 3.0× usual Isehara, 17 July: 20.4 µg/m³, 2.3× usual Isehara, 18 July: 5.3 µg/m³, 0.6× usual Isehara, 19 July: 4.0 µg/m³, 0.5× usual Atami Atami, 13 July: 14.7 µg/m³, 1.6× usual Atami, 14 July: 17.3 µg/m³, 1.9× usual Atami, 15 July: 16.9 µg/m³, 1.8× usual Atami, 16 July: 26.5 µg/m³, 2.8× usual Atami, 17 July: 21.0 µg/m³, 2.3× usual Atami, 18 July: 7.0 µg/m³, 0.8× usual Atami, 19 July: 4.0 µg/m³, 0.4× usual Mito Mito, 13 July: 15.2 µg/m³, 1.6× usual Mito, 14 July: 15.0 µg/m³, 1.6× usual Mito, 15 July: 18.6 µg/m³, 2.0× usual Mito, 16 July: 26.5 µg/m³, 2.8× usual Mito, 17 July: 14.5 µg/m³, 1.6× usual Mito, 18 July: 2.7 µg/m³, 0.3× usual Mito, 19 July: 5.8 µg/m³, 0.6× usual Yokohama Yokohama, 13 July: 16.7 µg/m³, 1.9× usual Yokohama, 14 July: 15.1 µg/m³, 1.7× usual Yokohama, 15 July: 13.7 µg/m³, 1.5× usual Yokohama, 16 July: 26.4 µg/m³, 2.9× usual Yokohama, 17 July: 17.2 µg/m³, 1.9× usual Yokohama, 18 July: 5.6 µg/m³, 0.6× usual Yokohama, 19 July: 3.6 µg/m³, 0.4× usual Urayasu Urayasu, 13 July: 16.9 µg/m³, 2.0× usual Urayasu, 14 July: 13.5 µg/m³, 1.6× usual Urayasu, 15 July: 13.5 µg/m³, 1.6× usual Urayasu, 16 July: 26.2 µg/m³, 3.2× usual Urayasu, 17 July: 15.7 µg/m³, 1.9× usual Urayasu, 18 July: 5.1 µg/m³, 0.6× usual Urayasu, 19 July: 3.3 µg/m³, 0.4× usual Kisarazu Kisarazu, 13 July: 16.0 µg/m³, 2.0× usual Kisarazu, 14 July: 11.9 µg/m³, 1.5× usual Kisarazu, 15 July: 13.4 µg/m³, 1.7× usual Kisarazu, 16 July: 26.1 µg/m³, 3.2× usual Kisarazu, 17 July: 17.0 µg/m³, 2.1× usual Kisarazu, 18 July: 3.8 µg/m³, 0.5× usual Kisarazu, 19 July: 2.5 µg/m³, 0.3× usual Machida Machida, 13 July: 16.1 µg/m³, 1.7× usual Machida, 14 July: 16.1 µg/m³, 1.7× usual Machida, 15 July: 15.4 µg/m³, 1.6× usual Machida, 16 July: 26.0 µg/m³, 2.7× usual Machida, 17 July: 15.5 µg/m³, 1.6× usual Machida, 18 July: 5.8 µg/m³, 0.6× usual Machida, 19 July: 4.4 µg/m³, 0.5× usual Toride Toride, 13 July: 14.8 µg/m³, 1.9× usual Toride, 14 July: 14.5 µg/m³, 1.9× usual Toride, 15 July: 14.8 µg/m³, 1.9× usual Toride, 16 July: 25.7 µg/m³, 3.3× usual Toride, 17 July: 15.8 µg/m³, 2.1× usual Toride, 18 July: 3.8 µg/m³, 0.5× usual Toride, 19 July: 4.1 µg/m³, 0.5× usual Yachiyo Yachiyo, 13 July: 14.9 µg/m³, 1.7× usual Yachiyo, 14 July: 15.6 µg/m³, 1.7× usual Yachiyo, 15 July: 16.1 µg/m³, 1.8× usual Yachiyo, 16 July: 25.7 µg/m³, 2.9× usual Yachiyo, 17 July: 15.7 µg/m³, 1.7× usual Yachiyo, 18 July: 3.6 µg/m³, 0.4× usual Yachiyo, 19 July: 5.0 µg/m³, 0.6× usual Minami-Alps Minami-Alps, 13 July: no reading Minami-Alps, 14 July: no reading Minami-Alps, 15 July: 21.9 µg/m³, 2.3× usual Minami-Alps, 16 July: 25.5 µg/m³, 2.7× usual Minami-Alps, 17 July: 25.7 µg/m³, 2.7× usual Minami-Alps, 18 July: 10.2 µg/m³, 1.1× usual Minami-Alps, 19 July: 7.3 µg/m³, 0.8× usual Mobara Mobara, 13 July: 15.1 µg/m³, 2.1× usual Mobara, 14 July: 13.0 µg/m³, 1.8× usual Mobara, 15 July: 14.9 µg/m³, 2.1× usual Mobara, 16 July: 25.4 µg/m³, 3.5× usual Mobara, 17 July: 12.6 µg/m³, 1.8× usual Mobara, 18 July: 2.3 µg/m³, 0.3× usual Mobara, 19 July: 3.6 µg/m³, 0.5× usual Hadano Hadano, 13 July: 15.0 µg/m³, 1.6× usual Hadano, 14 July: 15.5 µg/m³, 1.6× usual Hadano, 15 July: 16.8 µg/m³, 1.8× usual Hadano, 16 July: 25.3 µg/m³, 2.6× usual Hadano, 17 July: 20.6 µg/m³, 2.1× usual Hadano, 18 July: 5.8 µg/m³, 0.6× usual Hadano, 19 July: 4.3 µg/m³, 0.4× usual Fujinomiya Fujinomiya, 13 July: 18.7 µg/m³, 1.8× usual Fujinomiya, 14 July: 16.0 µg/m³, 1.5× usual Fujinomiya, 15 July: 15.8 µg/m³, 1.5× usual Fujinomiya, 16 July: 25.3 µg/m³, 2.4× usual Fujinomiya, 17 July: 23.3 µg/m³, 2.2× usual Fujinomiya, 18 July: 6.7 µg/m³, 0.6× usual Fujinomiya, 19 July: 3.2 µg/m³, 0.3× usual Hiratsuka Hiratsuka, 13 July: no reading Hiratsuka, 14 July: no reading Hiratsuka, 15 July: 16.0 µg/m³, 1.8× usual Hiratsuka, 16 July: 25.2 µg/m³, 2.9× usual Hiratsuka, 17 July: 19.3 µg/m³, 2.2× usual Hiratsuka, 18 July: 4.8 µg/m³, 0.6× usual Hiratsuka, 19 July: 3.1 µg/m³, 0.4× usual Azamino Azamino, 13 July: 15.7 µg/m³, 1.7× usual Azamino, 14 July: 15.0 µg/m³, 1.6× usual Azamino, 15 July: 14.0 µg/m³, 1.5× usual Azamino, 16 July: 25.2 µg/m³, 2.8× usual Azamino, 17 July: 14.9 µg/m³, 1.6× usual Azamino, 18 July: 5.6 µg/m³, 0.6× usual Azamino, 19 July: 3.3 µg/m³, 0.4× usual Inashiki Inashiki, 13 July: 17.1 µg/m³, 2.2× usual Inashiki, 14 July: 16.1 µg/m³, 2.0× usual Inashiki, 15 July: 17.0 µg/m³, 2.2× usual Inashiki, 16 July: 25.1 µg/m³, 3.2× usual Inashiki, 17 July: 13.8 µg/m³, 1.7× usual Inashiki, 18 July: 4.1 µg/m³, 0.5× usual Inashiki, 19 July: 4.9 µg/m³, 0.6× usual Fujieda Fujieda, 13 July: 18.7 µg/m³, 2.3× usual Fujieda, 14 July: 14.8 µg/m³, 1.8× usual Fujieda, 15 July: 18.0 µg/m³, 2.2× usual Fujieda, 16 July: 25.1 µg/m³, 3.1× usual Fujieda, 17 July: 20.5 µg/m³, 2.5× usual Fujieda, 18 July: 5.0 µg/m³, 0.6× usual Fujieda, 19 July: 2.4 µg/m³, 0.3× usual Shimoda Shimoda, 13 July: 15.5 µg/m³, 1.9× usual Shimoda, 14 July: 15.3 µg/m³, 1.9× usual Shimoda, 15 July: 15.8 µg/m³, 2.0× usual Shimoda, 16 July: 25.0 µg/m³, 3.1× usual Shimoda, 17 July: 20.9 µg/m³, 2.6× usual Shimoda, 18 July: 5.5 µg/m³, 0.7× usual Shimoda, 19 July: 3.1 µg/m³, 0.4× usual Noborito Noborito, 13 July: 15.7 µg/m³, 1.7× usual Noborito, 14 July: 14.7 µg/m³, 1.6× usual Noborito, 15 July: 14.5 µg/m³, 1.5× usual Noborito, 16 July: 25.0 µg/m³, 2.7× usual Noborito, 17 July: 14.7 µg/m³, 1.6× usual Noborito, 18 July: 5.4 µg/m³, 0.6× usual Noborito, 19 July: 3.6 µg/m³, 0.4× usual 13 Jul 14 15 16 17 18 19 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
Hokota Ibaraki, Japan 1 16 July 8.1 4.1× Ichihara Chiba, Japan 1 16 July 7.6 3.6× Izunokuni Shizuoka, Japan 1 16 July 8.6 3.6× Mobara Chiba, Japan 1 16 July 7.2 3.5× Sakura Chiba, Japan 1 16 July 7.9 3.4× Hitachi-Naka Ibaraki, Japan 1 16 July 8.0 3.4× Toride Ibaraki, Japan 1 16 July 7.7 3.3× Jōsō Ibaraki, Japan 1 16 July 8.3 3.3× Kashima-shi Ibaraki, Japan 1 16 July 8.8 3.3× Chiba Chiba, Japan 1 16 July 8.6 3.3× Numazu Shizuoka, Japan 1 16 July 8.3 3.3× Kisarazu Chiba, Japan 1 16 July 8.1 3.2× Inashiki Ibaraki, Japan 1 16 July 7.9 3.2× Urayasu Chiba, Japan 1 16 July 8.3 3.2× Fujieda Shizuoka, Japan 1 16 July 8.1 3.1× Shimoda Shizuoka, Japan 1 16 July 8.1 3.1× Naka Ibaraki, Japan 1 16 July 9.8 3.1× Isehara Kanagawa, Japan 1 16 July 8.7 3.0× Kamisu Ibaraki, Japan 1 16 July 10.3 3.0× Odawara Kanagawa, Japan 1 16 July 9.0 3.0× Shimo-tsuma Ibaraki, Japan 1 16 July 9.6 3.0× Yokohama Kanagawa, Japan 1 16 July 9.0 2.9× Hiratsuka Kanagawa, Japan 1 16 July 8.7 2.9× Chigasaki Kanagawa, Japan 1 16 July 9.9 2.9× Kasama Ibaraki, Japan 1 16 July 9.4 2.9× Yachiyo Chiba, Japan 1 16 July 9.0 2.9× Atami Shizuoka, Japan 1 16 July 9.3 2.8× Mito Ibaraki, Japan 1 16 July 9.3 2.8× Azamino Kanagawa, Japan 1 16 July 9.1 2.8× Ayase Kanagawa, Japan 1 16 July 11.4 2.8× Machida Tokyo, Japan 1 16 July 9.5 2.7× Tsuchiura Ibaraki, Japan 1 16 July 12.0 2.7× Minami-Alps Yamanashi, Japan 1 17 July 9.5 2.7× Fukuroi Shizuoka, Japan 1 16 July 9.9 2.7× Noborito Kanagawa, Japan 1 16 July 9.4 2.7× Hachiōji Tokyo, Japan 1 16 July 10.9 2.6× Gotemba Shizuoka, Japan 1 16 July 11.4 2.6× Hadano Kanagawa, Japan 1 16 July 9.6 2.6× Iwaki Fukushima, Japan 1 16 July 11.3 2.6× Fujinomiya Shizuoka, Japan 1 16 July 10.4 2.4× Aihara Kanagawa, Japan 1 16 July 12.0 2.4×
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 16 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, July 2026 41 Bars: cities reached; colour: the level of the episode's highest daily reading. All 27 .
Use this page SmogRank, Japan, July 2026: 41 cities with PM2.5 at twice their usual or more, 16 July 2026, smogrank.com/episodes/2026-07-japan (accessed 2 October 2026).
Copy citation Download top 10 (PNG)
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.
