SmogRank / Episodes / Japan
Japan, 12 to 14 July 2024
For 3 days, from 12 to 14 July 2024, 38 cities in Japan had PM2.5 at least twice their usual for the time of year. The worst reading was Nagai, Yamagata, Japan: 36.1 µg/m³ on 14 July, about 3.0× its usual 12.0. Ended 14 July.
Few fires were detected near these cities on those days. Spreads like this usually come from still weather trapping smoke from heating, traffic and industry, or from dust.
Cities reached 38 in 1 country
Days 3 12 to 14 July 2024
Worst day 14 July 30 cities counted
Furthest above usual 4.5× Tōma
Day by day
Play 14 July 30 cities at twice their usual or more
Yurihonjō Ōshū Kuji Kurihara Tome Miyako Ōsaki Kesennuma Kamaishi Wakuya Yoshioka Matsushima Higashimatsushima Sendai Tagajō-shi Ishinomaki Kawasaki Natori-shi Iwanuma Shiroishi Kakuda Ōuchi Fukushima Sōma Minami-Sōma Tomakomai Ōyauchi Shirakawa Mizunashi Chitose Iwaki Nasushiobara Kitaibaraki Yaita Minamiuonuma Nasukarasuyama Imaichi Hitachi Hitachiomiya Utsunomiya Kanuma Jōetsu Mooka Kaminokawa Hitachi-Naka Kasama Numata Mito Tochigi Oyama Nakanojō Kiryū Sano Shibukawa Ashikaga Ishioka Shimo-tsuma Ōta Hokota Tatebayashi Koga Obihiro Sakai-nakajima Tsuchiura Obuse Menuma Itoigawa Takasaki Hanyū Saikubo Suzaka Naka Honjō Bandō Kazo Gyōda Jōsō Kumagaya Kukichūō Nagano Kodamachō-kodamaminami Kōnosu Kashima-shi Tomioka Inashiki Kasukabe Yorii Noda Higashi-Matsuyama Kōzaki Kamisu Ageo Ogawamachi Toride Sawara Minano Igusa Omigawa Koshigaya Kashiwa Saitama Ajiki Sukayama Inzai Sakado Chikuma Ueda Misato, Saitama Kawagoe Sōka Morohongō Narita Nyūzen Chichibu Saku Kamagaya Matsudo Kawaguchi Niiza Sayama Yachiyo Asaka Choshi Sōsa Sakura Hannō Tokorozawa Iruma Baraki Higashikurume Higashimurayama Yokota Kodaira Ōme Uozu Akishima Namerikawa Matsumoto Nanao Suwa Toyama Imizu Himimachi Takaoka Hakui Kushiro Tonami Ina Oyabe Tsubata Takayama Kitami Kanazawa Nonoichi Matsutō Gero Komatsu Kaga Ono Mikuni Fukui-shi Sabae Chikusei Kōriyama Aizu-Wakamatsu Nagai Shonai Seirō Shibata Noshiro Oga Sakata Ōdate Hachinohe Niigata Nagaoka Tsuruoka Maki Yonezawa Kameda-honchō Higashine Sagae Shirone Ichinoseki Sado Niitsu-honchō Akita Sapporo Hirosaki Yamagata Hakodate Aomori Morioka Muroran Asahikawa Takizawa Goshogawara Yokote Hanamaki Tōma 9 Jul 10 11 12 13 14 15 16 17 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
Muroran Muroran, 9 July: 7.5 µg/m³ Muroran, 10 July: 15.3 µg/m³ Muroran, 11 July: 21.5 µg/m³ Muroran, 12 July: 29.5 µg/m³, 4.1× its usual 7.2 Muroran, 13 July: 24.0 µg/m³ Muroran, 14 July: 8.1 µg/m³ Muroran, 15 July: 16.4 µg/m³ Muroran, 16 July: 23.0 µg/m³ Muroran, 17 July: 13.6 µg/m³ Tōma Tōma, 9 July: 4.6 µg/m³ Tōma, 10 July: 14.1 µg/m³ Tōma, 11 July: 30.5 µg/m³ Tōma, 12 July: 28.6 µg/m³, 4.5× its usual 6.4 Tōma, 13 July: 13.1 µg/m³ Tōma, 14 July: 5.7 µg/m³ Tōma, 15 July: 18.6 µg/m³ Tōma, 16 July: 26.5 µg/m³ Tōma, 17 July: 24.7 µg/m³ Asahikawa Asahikawa, 9 July: 5.2 µg/m³ Asahikawa, 10 July: 14.2 µg/m³ Asahikawa, 11 July: 29.3 µg/m³ Asahikawa, 12 July: 27.4 µg/m³, 4.2× its usual 6.6 Asahikawa, 13 July: 11.8 µg/m³ Asahikawa, 14 July: 6.5 µg/m³ Asahikawa, 15 July: 20.8 µg/m³ Asahikawa, 16 July: 26.5 µg/m³ Asahikawa, 17 July: 25.2 µg/m³ Sapporo Sapporo, 9 July: 4.3 µg/m³ Sapporo, 10 July: 12.6 µg/m³ Sapporo, 11 July: 20.6 µg/m³ Sapporo, 12 July: 25.3 µg/m³, 3.8× its usual 6.7 Sapporo, 13 July: 9.7 µg/m³ Sapporo, 14 July: 7.5 µg/m³ Sapporo, 15 July: 13.4 µg/m³ Sapporo, 16 July: 22.0 µg/m³ Sapporo, 17 July: 16.2 µg/m³ Sagae Sagae, 9 July: 5.8 µg/m³ Sagae, 10 July: 5.9 µg/m³ Sagae, 11 July: 5.4 µg/m³ Sagae, 12 July: 19.5 µg/m³ Sagae, 13 July: 35.0 µg/m³, 3.5× its usual 10.0 Sagae, 14 July: 34.5 µg/m³, 3.4× its usual 10.1 Sagae, 15 July: 17.5 µg/m³ Sagae, 16 July: 25.2 µg/m³ Sagae, 17 July: 20.8 µg/m³ Morioka Morioka, 9 July: 5.1 µg/m³ Morioka, 10 July: 5.2 µg/m³ Morioka, 11 July: 4.8 µg/m³ Morioka, 12 July: 17.1 µg/m³ Morioka, 13 July: 32.5 µg/m³, 4.0× its usual 8.2 Morioka, 14 July: 30.1 µg/m³, 3.6× its usual 8.3 Morioka, 15 July: 20.8 µg/m³ Morioka, 16 July: 23.3 µg/m³ Morioka, 17 July: 18.1 µg/m³ Yamagata Yamagata, 9 July: 4.8 µg/m³ Yamagata, 10 July: 4.6 µg/m³ Yamagata, 11 July: 4.2 µg/m³ Yamagata, 12 July: 13.3 µg/m³ Yamagata, 13 July: 31.1 µg/m³, 3.8× its usual 8.2 Yamagata, 14 July: 32.0 µg/m³, 3.9× its usual 8.2 Yamagata, 15 July: 12.6 µg/m³ Yamagata, 16 July: 20.8 µg/m³ Yamagata, 17 July: 16.0 µg/m³ Hanamaki Hanamaki, 9 July: 4.2 µg/m³ Hanamaki, 10 July: 3.9 µg/m³ Hanamaki, 11 July: 3.0 µg/m³ Hanamaki, 12 July: 16.2 µg/m³ Hanamaki, 13 July: 30.5 µg/m³, 4.3× its usual 7.1 Hanamaki, 14 July: 24.9 µg/m³ Hanamaki, 15 July: 18.1 µg/m³ Hanamaki, 16 July: 22.6 µg/m³ Hanamaki, 17 July: 15.3 µg/m³ Higashine Higashine, 9 July: 3.4 µg/m³ Higashine, 10 July: 3.5 µg/m³ Higashine, 11 July: 3.7 µg/m³ Higashine, 12 July: 15.1 µg/m³ Higashine, 13 July: 30.5 µg/m³, 3.5× its usual 8.8 Higashine, 14 July: 28.0 µg/m³, 3.1× its usual 8.9 Higashine, 15 July: 13.6 µg/m³ Higashine, 16 July: 22.8 µg/m³ Higashine, 17 July: 14.5 µg/m³ Ichinoseki Ichinoseki, 9 July: 4.8 µg/m³ Ichinoseki, 10 July: 6.1 µg/m³ Ichinoseki, 11 July: 3.7 µg/m³ Ichinoseki, 12 July: 13.9 µg/m³ Ichinoseki, 13 July: 30.2 µg/m³, 3.6× its usual 8.3 Ichinoseki, 14 July: 19.1 µg/m³ Ichinoseki, 15 July: 17.3 µg/m³ Ichinoseki, 16 July: 21.9 µg/m³ Ichinoseki, 17 July: 13.9 µg/m³ Takizawa Takizawa, 9 July: 3.0 µg/m³ Takizawa, 10 July: 3.7 µg/m³ Takizawa, 11 July: 3.3 µg/m³ Takizawa, 12 July: 16.5 µg/m³ Takizawa, 13 July: 29.6 µg/m³, 4.2× its usual 7.0 Takizawa, 14 July: 27.0 µg/m³, 3.8× its usual 7.1 Takizawa, 15 July: 18.5 µg/m³ Takizawa, 16 July: 20.8 µg/m³ Takizawa, 17 July: 16.4 µg/m³ Yonezawa Yonezawa, 9 July: 4.9 µg/m³ Yonezawa, 10 July: 4.6 µg/m³ Yonezawa, 11 July: 4.8 µg/m³ Yonezawa, 12 July: 6.5 µg/m³ Yonezawa, 13 July: 29.0 µg/m³, 3.0× its usual 9.6 Yonezawa, 14 July: 32.9 µg/m³, 3.4× its usual 9.6 Yonezawa, 15 July: 11.7 µg/m³ Yonezawa, 16 July: 16.0 µg/m³ Yonezawa, 17 July: 11.4 µg/m³ Sado Sado, 9 July: 9.6 µg/m³ Sado, 10 July: 4.1 µg/m³ Sado, 11 July: 5.3 µg/m³ Sado, 12 July: 12.0 µg/m³ Sado, 13 July: 28.8 µg/m³, 3.5× its usual 8.3 Sado, 14 July: 30.5 µg/m³, 3.6× its usual 8.5 Sado, 15 July: 14.3 µg/m³ Sado, 16 July: 8.4 µg/m³ Sado, 17 July: 5.1 µg/m³ Goshogawara Goshogawara, 9 July: 7.1 µg/m³ Goshogawara, 10 July: 3.3 µg/m³ Goshogawara, 11 July: 7.0 µg/m³ Goshogawara, 12 July: 17.0 µg/m³ Goshogawara, 13 July: 28.6 µg/m³, 4.1× its usual 6.9 Goshogawara, 14 July: 29.7 µg/m³, 4.2× its usual 7.1 Goshogawara, 15 July: 27.1 µg/m³ Goshogawara, 16 July: 23.2 µg/m³ Goshogawara, 17 July: 17.3 µg/m³ Aomori Aomori, 9 July: 8.5 µg/m³ Aomori, 10 July: 5.5 µg/m³ Aomori, 11 July: 8.7 µg/m³ Aomori, 12 July: 20.9 µg/m³ Aomori, 13 July: 28.0 µg/m³, 3.6× its usual 7.8 Aomori, 14 July: 31.4 µg/m³, 4.0× its usual 7.8 Aomori, 15 July: 21.8 µg/m³ Aomori, 16 July: 21.2 µg/m³ Aomori, 17 July: 19.0 µg/m³ Hakodate Hakodate, 9 July: 5.7 µg/m³ Hakodate, 10 July: 7.6 µg/m³ Hakodate, 11 July: 10.4 µg/m³ Hakodate, 12 July: 22.1 µg/m³ Hakodate, 13 July: 27.9 µg/m³, 4.0× its usual 7.0 Hakodate, 14 July: 13.4 µg/m³ Hakodate, 15 July: 16.0 µg/m³ Hakodate, 16 July: 19.5 µg/m³ Hakodate, 17 July: 15.3 µg/m³ Hirosaki Hirosaki, 9 July: 6.8 µg/m³ Hirosaki, 10 July: 5.9 µg/m³ Hirosaki, 11 July: 7.7 µg/m³ Hirosaki, 12 July: 21.5 µg/m³ Hirosaki, 13 July: 27.9 µg/m³, 3.2× its usual 8.6 Hirosaki, 14 July: 32.4 µg/m³, 3.8× its usual 8.6 Hirosaki, 15 July: 32.0 µg/m³ Hirosaki, 16 July: 28.3 µg/m³ Hirosaki, 17 July: 22.0 µg/m³ Shonai Shonai, 9 July: 7.0 µg/m³ Shonai, 10 July: 5.2 µg/m³ Shonai, 11 July: 5.0 µg/m³ Shonai, 12 July: 12.3 µg/m³ Shonai, 13 July: 27.7 µg/m³, 2.9× its usual 9.6 Shonai, 14 July: 29.6 µg/m³, 3.1× its usual 9.6 Shonai, 15 July: 20.8 µg/m³ Shonai, 16 July: 24.0 µg/m³ Shonai, 17 July: 14.5 µg/m³ Hachinohe Hachinohe, 9 July: 3.8 µg/m³ Hachinohe, 10 July: 6.1 µg/m³ Hachinohe, 11 July: 7.0 µg/m³ Hachinohe, 12 July: 15.7 µg/m³ Hachinohe, 13 July: 27.6 µg/m³, 3.3× its usual 8.4 Hachinohe, 14 July: 23.0 µg/m³ Hachinohe, 15 July: 21.4 µg/m³ Hachinohe, 16 July: 24.1 µg/m³ Hachinohe, 17 July: 18.5 µg/m³ Nagai Nagai, 9 July: no reading Nagai, 10 July: no reading Nagai, 11 July: no reading Nagai, 12 July: 9.2 µg/m³ Nagai, 13 July: 26.0 µg/m³, 2.2× its usual 12.0 Nagai, 14 July: 36.1 µg/m³, 3.0× its usual 12.0 Nagai, 15 July: 11.7 µg/m³ Nagai, 16 July: 16.7 µg/m³ Nagai, 17 July: no reading Yokote Yokote, 9 July: 3.4 µg/m³ Yokote, 10 July: 4.6 µg/m³ Yokote, 11 July: 2.5 µg/m³ Yokote, 12 July: 14.5 µg/m³ Yokote, 13 July: 25.5 µg/m³, 3.3× its usual 7.8 Yokote, 14 July: 32.6 µg/m³, 4.2× its usual 7.8 Yokote, 15 July: 19.4 µg/m³ Yokote, 16 July: 20.2 µg/m³ Yokote, 17 July: 13.7 µg/m³ Sakata Sakata, 9 July: 7.6 µg/m³ Sakata, 10 July: 7.2 µg/m³ Sakata, 11 July: 5.6 µg/m³ Sakata, 12 July: 11.2 µg/m³ Sakata, 13 July: 25.4 µg/m³, 2.4× its usual 10.5 Sakata, 14 July: 33.3 µg/m³, 3.2× its usual 10.5 Sakata, 15 July: 22.4 µg/m³ Sakata, 16 July: 23.4 µg/m³ Sakata, 17 July: 15.7 µg/m³ Tsuruoka Tsuruoka, 9 July: 6.4 µg/m³ Tsuruoka, 10 July: 6.5 µg/m³ Tsuruoka, 11 July: 6.4 µg/m³ Tsuruoka, 12 July: 12.1 µg/m³ Tsuruoka, 13 July: 25.2 µg/m³, 2.6× its usual 9.7 Tsuruoka, 14 July: 32.8 µg/m³, 3.3× its usual 9.8 Tsuruoka, 15 July: 19.2 µg/m³ Tsuruoka, 16 July: 21.1 µg/m³ Tsuruoka, 17 July: 14.3 µg/m³ Niitsu-honchō Niitsu-honchō, 9 July: 6.3 µg/m³ Niitsu-honchō, 10 July: 3.5 µg/m³ Niitsu-honchō, 11 July: 3.1 µg/m³ Niitsu-honchō, 12 July: 6.1 µg/m³ Niitsu-honchō, 13 July: 17.7 µg/m³ Niitsu-honchō, 14 July: 32.0 µg/m³, 3.6× its usual 8.8 Niitsu-honchō, 15 July: 9.4 µg/m³ Niitsu-honchō, 16 July: 9.1 µg/m³ Niitsu-honchō, 17 July: 5.5 µg/m³ Shibata Shibata, 9 July: 7.7 µg/m³ Shibata, 10 July: 5.4 µg/m³ Shibata, 11 July: 4.7 µg/m³ Shibata, 12 July: 8.7 µg/m³ Shibata, 13 July: 18.5 µg/m³ Shibata, 14 July: 30.6 µg/m³, 3.1× its usual 10.0 Shibata, 15 July: 11.7 µg/m³ Shibata, 16 July: 9.3 µg/m³ Shibata, 17 July: 7.8 µg/m³ Seirō Seirō, 9 July: 6.1 µg/m³ Seirō, 10 July: 3.9 µg/m³ Seirō, 11 July: 5.4 µg/m³ Seirō, 12 July: 9.0 µg/m³ Seirō, 13 July: 18.2 µg/m³ Seirō, 14 July: 29.7 µg/m³, 3.1× its usual 9.5 Seirō, 15 July: 13.0 µg/m³ Seirō, 16 July: 7.8 µg/m³ Seirō, 17 July: 6.3 µg/m³ Kameda-honchō Kameda-honchō, 9 July: 6.4 µg/m³ Kameda-honchō, 10 July: 3.5 µg/m³ Kameda-honchō, 11 July: 4.1 µg/m³ Kameda-honchō, 12 July: 8.6 µg/m³ Kameda-honchō, 13 July: 18.6 µg/m³ Kameda-honchō, 14 July: 29.6 µg/m³, 3.5× its usual 8.5 Kameda-honchō, 15 July: 13.5 µg/m³ Kameda-honchō, 16 July: 9.8 µg/m³ Kameda-honchō, 17 July: 5.8 µg/m³ Nagaoka Nagaoka, 9 July: 6.6 µg/m³ Nagaoka, 10 July: 3.0 µg/m³ Nagaoka, 11 July: 2.8 µg/m³ Nagaoka, 12 July: 5.3 µg/m³ Nagaoka, 13 July: 17.0 µg/m³ Nagaoka, 14 July: 29.6 µg/m³, 3.3× its usual 8.9 Nagaoka, 15 July: 9.6 µg/m³ Nagaoka, 16 July: 5.8 µg/m³ Nagaoka, 17 July: 5.2 µg/m³ Shirone Shirone, 9 July: 5.9 µg/m³ Shirone, 10 July: 2.7 µg/m³ Shirone, 11 July: 2.4 µg/m³ Shirone, 12 July: 6.3 µg/m³ Shirone, 13 July: 18.5 µg/m³ Shirone, 14 July: 29.4 µg/m³, 3.6× its usual 8.2 Shirone, 15 July: 10.1 µg/m³ Shirone, 16 July: 5.9 µg/m³ Shirone, 17 July: 4.4 µg/m³ Niigata Niigata, 9 July: 6.4 µg/m³ Niigata, 10 July: 2.9 µg/m³ Niigata, 11 July: 3.4 µg/m³ Niigata, 12 July: 7.7 µg/m³ Niigata, 13 July: 18.0 µg/m³ Niigata, 14 July: 28.7 µg/m³, 3.3× its usual 8.6 Niigata, 15 July: 13.3 µg/m³ Niigata, 16 July: 8.2 µg/m³ Niigata, 17 July: 5.1 µg/m³ Akita Akita, 9 July: 4.1 µg/m³ Akita, 10 July: 5.6 µg/m³ Akita, 11 July: 3.4 µg/m³ Akita, 12 July: 10.5 µg/m³ Akita, 13 July: 22.4 µg/m³ Akita, 14 July: 28.0 µg/m³, 3.7× its usual 7.5 Akita, 15 July: 21.0 µg/m³ Akita, 16 July: 17.9 µg/m³ Akita, 17 July: no reading Maki Maki, 9 July: 5.6 µg/m³ Maki, 10 July: 3.2 µg/m³ Maki, 11 July: 2.3 µg/m³ Maki, 12 July: 8.4 µg/m³ Maki, 13 July: 18.2 µg/m³ Maki, 14 July: 27.9 µg/m³, 3.4× its usual 8.1 Maki, 15 July: 11.9 µg/m³ Maki, 16 July: 8.1 µg/m³ Maki, 17 July: 4.2 µg/m³ Oga Oga, 9 July: 4.7 µg/m³ Oga, 10 July: 5.3 µg/m³ Oga, 11 July: 5.6 µg/m³ Oga, 12 July: 12.0 µg/m³ Oga, 13 July: 23.6 µg/m³ Oga, 14 July: 27.9 µg/m³, 3.2× its usual 8.8 Oga, 15 July: 29.1 µg/m³ Oga, 16 July: 23.1 µg/m³ Oga, 17 July: 14.5 µg/m³ Noshiro Noshiro, 9 July: 5.6 µg/m³ Noshiro, 10 July: 4.5 µg/m³ Noshiro, 11 July: 6.1 µg/m³ Noshiro, 12 July: 14.5 µg/m³ Noshiro, 13 July: 21.7 µg/m³ Noshiro, 14 July: 27.5 µg/m³, 3.2× its usual 8.6 Noshiro, 15 July: no reading Noshiro, 16 July: no reading Noshiro, 17 July: 14.8 µg/m³ Ōdate Ōdate, 9 July: 4.4 µg/m³ Ōdate, 10 July: 3.4 µg/m³ Ōdate, 11 July: no reading Ōdate, 12 July: no reading Ōdate, 13 July: 23.2 µg/m³ Ōdate, 14 July: 27.1 µg/m³, 3.3× its usual 8.2 Ōdate, 15 July: no reading Ōdate, 16 July: no reading Ōdate, 17 July: 17.9 µg/m³ Kōriyama Kōriyama, 9 July: 5.6 µg/m³ Kōriyama, 10 July: 3.6 µg/m³ Kōriyama, 11 July: 4.3 µg/m³ Kōriyama, 12 July: 4.3 µg/m³ Kōriyama, 13 July: 19.6 µg/m³ Kōriyama, 14 July: 26.3 µg/m³, 2.8× its usual 9.3 Kōriyama, 15 July: 12.1 µg/m³ Kōriyama, 16 July: 15.2 µg/m³ Kōriyama, 17 July: 12.0 µg/m³ Chikusei Chikusei, 9 July: 32.9 µg/m³ Chikusei, 10 July: 19.2 µg/m³ Chikusei, 11 July: 18.2 µg/m³ Chikusei, 12 July: 8.8 µg/m³ Chikusei, 13 July: 18.4 µg/m³ Chikusei, 14 July: 25.8 µg/m³, 2.6× its usual 10.0 Chikusei, 15 July: 11.7 µg/m³ Chikusei, 16 July: 22.0 µg/m³ Chikusei, 17 July: 13.5 µg/m³ Aizu-Wakamatsu Aizu-Wakamatsu, 9 July: 4.3 µg/m³ Aizu-Wakamatsu, 10 July: 2.0 µg/m³ Aizu-Wakamatsu, 11 July: 1.9 µg/m³ Aizu-Wakamatsu, 12 July: 3.6 µg/m³ Aizu-Wakamatsu, 13 July: 18.1 µg/m³ Aizu-Wakamatsu, 14 July: 25.5 µg/m³, 3.0× its usual 8.5 Aizu-Wakamatsu, 15 July: 8.3 µg/m³ Aizu-Wakamatsu, 16 July: 9.4 µg/m³ Aizu-Wakamatsu, 17 July: 5.4 µg/m³ 9 Jul 10 11 12 13 14 15 16 17 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
Tōma Hokkaido, Japan 1 12 July 6.4 4.5× Hanamaki Iwate, Japan 1 13 July 7.1 4.3× Yokote Akita, Japan 2 14 July 7.8 4.2× Goshogawara Aomori, Japan 2 14 July 7.1 4.2× Takizawa Iwate, Japan 2 13 July 7.0 4.2× Asahikawa Hokkaido, Japan 1 12 July 6.6 4.2× Muroran Hokkaido, Japan 1 12 July 7.2 4.1× Morioka Iwate, Japan 2 13 July 8.2 4.0× Aomori Aomori, Japan 2 14 July 7.8 4.0× Hakodate Hokkaido, Japan 1 13 July 7.0 4.0× Yamagata Yamagata, Japan 2 14 July 8.2 3.9× Hirosaki Aomori, Japan 2 14 July 8.6 3.8× Sapporo Hokkaido, Japan 1 12 July 6.7 3.8× Akita Akita, Japan 1 14 July 7.5 3.7× Niitsu-honchō Niigata, Japan 1 14 July 8.8 3.6× Sado Niigata, Japan 2 14 July 8.5 3.6× Ichinoseki Iwate, Japan 1 13 July 8.3 3.6× Shirone Niigata, Japan 1 14 July 8.2 3.6× Sagae Yamagata, Japan 2 13 July 10.0 3.5× Higashine Yamagata, Japan 2 13 July 8.8 3.5× Kameda-honchō Niigata, Japan 1 14 July 8.5 3.5× Yonezawa Yamagata, Japan 2 14 July 9.6 3.4× Maki Niigata, Japan 1 14 July 8.1 3.4× Tsuruoka Yamagata, Japan 2 14 July 9.8 3.3× Nagaoka Niigata, Japan 1 14 July 8.9 3.3× Niigata Niigata, Japan 1 14 July 8.6 3.3× Hachinohe Aomori, Japan 1 13 July 8.4 3.3× Ōdate Akita, Japan 1 14 July 8.2 3.3× Sakata Yamagata, Japan 2 14 July 10.5 3.2× Oga Akita, Japan 1 14 July 8.8 3.2× Noshiro Akita, Japan 1 14 July 8.6 3.2× Shibata Niigata, Japan 1 14 July 10.0 3.1× Seirō Niigata, Japan 1 14 July 9.5 3.1× Shonai Yamagata, Japan 2 14 July 9.6 3.1× Nagai Yamagata, Japan 2 14 July 12.0 3.0× Aizu-Wakamatsu Fukushima, Japan 1 14 July 8.5 3.0× Kōriyama Fukushima, Japan 1 14 July 9.3 2.8× Chikusei Ibaraki, Japan 1 14 July 10.0 2.6×
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 20 of 37 episodes in Japan 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 Japan, November 2023 133 Japan, 4 to 5 August 2025 130 Japan and South Korea, 31 January to 1 February 2025 113 Japan, May 2025 107 Japan, March 2025 96 Japan, 12 to 14 July 2024 38 Bars: cities reached; colour: the level of the episode's highest daily reading. All 37 .
Use this page SmogRank, Japan, 12 to 14 July 2024: 38 cities with PM2.5 at twice their usual or more, 12 to 14 July 2024, smogrank.com/episodes/2024-07-12-japan (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. Fire detections from NASA FIRMS; smoke maps from NOAA HMS.
