SmogRank / Episodes / Japan
Japan, July 2024
For 2 days, from 13 to 14 July 2024, 33 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.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 33 in 1 country
Days 2 13 to 14 July 2024
Worst day 14 July 29 cities counted
Furthest above usual 4.3× Hanamaki
Day by day
Play 14 July 29 cities at twice their usual or more
Yurihonjō Kurihara Yoshioka Ōsaki Sendai Ōshū Shiroishi Tome Natori-shi Tagajō-shi Wakuya Matsushima Iwanuma Kakuda Higashimatsushima Fukushima Ishinomaki Sōma Kesennuma Minami-Sōma Kamaishi Shirakawa Nasushiobara Miyako Kuji Iwaki Minamiuonuma Yaita Imaichi Kitaibaraki Nasukarasuyama Utsunomiya Kanuma Hitachiomiya Jōetsu Hitachi Numata Kaminokawa Mooka Tochigi Kasama Nakanojō Kiryū Hitachi-Naka Shibukawa Mito Oyama Sano Ashikaga Ōta Tatebayashi Sakai-nakajima Takasaki Shimo-tsuma Koga Menuma Ishioka Suzaka Itoigawa Honjō Hanyū Gyōda Kazo Hokota Kumagaya Nagano Tsuchiura Kodamachō-kodamaminami Tomioka Bandō Kukichūō Naka Kōnosu Jōsō Yorii Higashi-Matsuyama Ogawamachi Kasukabe Ageo Noda Igusa Inashiki Ueda Chikuma Sakado Toride Saitama Koshigaya Kashima-shi Kawagoe Chichibu Morohongō Saku Kashiwa Sawara Nyūzen Kamisu Uozu Matsumoto Namerikawa Suwa Nanao Toyama Imizu Himimachi Takaoka Hakui Tonami Oyabe Takayama Tsubata Kanazawa Nonoichi Matsutō Komatsu Kaga Ono Mikuni Fukui-shi Sabae Chikusei Kōriyama Aizu-Wakamatsu Nagai Shibata Shonai Oga Noshiro Sakata Ōdate Nagaoka Niigata Hachinohe Tsuruoka Maki Yonezawa Kameda-honchō Higashine Sagae Niitsu-honchō Shirone Sado Ichinoseki Akita Hirosaki Yamagata Aomori Hakodate Morioka Takizawa Goshogawara Yokote Hanamaki 10 Jul 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
Sagae Sagae, 10 July: 5.9 µg/m³, 0.6× usual Sagae, 11 July: 5.4 µg/m³, 0.5× usual Sagae, 12 July: 19.5 µg/m³, 2.0× usual Sagae, 13 July: 35.0 µg/m³, 3.5× usual Sagae, 14 July: 34.5 µg/m³, 3.5× usual Sagae, 15 July: 17.5 µg/m³, 1.8× usual Sagae, 16 July: 25.2 µg/m³, 2.5× usual Sagae, 17 July: 20.8 µg/m³, 2.1× usual Morioka Morioka, 10 July: 5.2 µg/m³, 0.6× usual Morioka, 11 July: 4.8 µg/m³, 0.6× usual Morioka, 12 July: 17.1 µg/m³, 2.1× usual Morioka, 13 July: 32.5 µg/m³, 4.0× usual Morioka, 14 July: 30.1 µg/m³, 3.7× usual Morioka, 15 July: 20.8 µg/m³, 2.5× usual Morioka, 16 July: 23.3 µg/m³, 2.8× usual Morioka, 17 July: 18.1 µg/m³, 2.2× usual Yamagata Yamagata, 10 July: 4.6 µg/m³, 0.6× usual Yamagata, 11 July: 4.2 µg/m³, 0.5× usual Yamagata, 12 July: 13.3 µg/m³, 1.6× usual Yamagata, 13 July: 31.1 µg/m³, 3.8× usual Yamagata, 14 July: 32.0 µg/m³, 3.9× usual Yamagata, 15 July: 12.6 µg/m³, 1.5× usual Yamagata, 16 July: 20.8 µg/m³, 2.5× usual Yamagata, 17 July: 16.0 µg/m³, 2.0× usual Hanamaki Hanamaki, 10 July: 3.9 µg/m³, 0.5× usual Hanamaki, 11 July: 3.0 µg/m³, 0.4× usual Hanamaki, 12 July: 16.2 µg/m³, 2.3× usual Hanamaki, 13 July: 30.5 µg/m³, 4.3× usual Hanamaki, 14 July: 24.9 µg/m³, 3.5× usual Hanamaki, 15 July: 18.1 µg/m³, 2.5× usual Hanamaki, 16 July: 22.6 µg/m³, 3.2× usual Hanamaki, 17 July: 15.3 µg/m³, 2.2× usual Higashine Higashine, 10 July: 3.5 µg/m³, 0.4× usual Higashine, 11 July: 3.7 µg/m³, 0.4× usual Higashine, 12 July: 15.1 µg/m³, 1.7× usual Higashine, 13 July: 30.5 µg/m³, 3.5× usual Higashine, 14 July: 28.0 µg/m³, 3.2× usual Higashine, 15 July: 13.6 µg/m³, 1.5× usual Higashine, 16 July: 22.8 µg/m³, 2.6× usual Higashine, 17 July: 14.5 µg/m³, 1.6× usual Ichinoseki Ichinoseki, 10 July: 6.1 µg/m³, 0.7× usual Ichinoseki, 11 July: 3.7 µg/m³, 0.4× usual Ichinoseki, 12 July: 13.9 µg/m³, 1.7× usual Ichinoseki, 13 July: 30.2 µg/m³, 3.6× usual Ichinoseki, 14 July: 19.1 µg/m³, 2.3× usual Ichinoseki, 15 July: 17.3 µg/m³, 2.1× usual Ichinoseki, 16 July: 21.9 µg/m³, 2.6× usual Ichinoseki, 17 July: 13.9 µg/m³, 1.7× usual Takizawa Takizawa, 10 July: 3.7 µg/m³, 0.5× usual Takizawa, 11 July: 3.3 µg/m³, 0.5× usual Takizawa, 12 July: 16.5 µg/m³, 2.4× usual Takizawa, 13 July: 29.6 µg/m³, 4.2× usual Takizawa, 14 July: 27.0 µg/m³, 3.9× usual Takizawa, 15 July: 18.5 µg/m³, 2.6× usual Takizawa, 16 July: 20.8 µg/m³, 3.0× usual Takizawa, 17 July: 16.4 µg/m³, 2.3× usual Yonezawa Yonezawa, 10 July: 4.6 µg/m³, 0.5× usual Yonezawa, 11 July: 4.8 µg/m³, 0.5× usual Yonezawa, 12 July: 6.5 µg/m³, 0.7× usual Yonezawa, 13 July: 29.0 µg/m³, 3.0× usual Yonezawa, 14 July: 32.9 µg/m³, 3.4× usual Yonezawa, 15 July: 11.7 µg/m³, 1.2× usual Yonezawa, 16 July: 16.0 µg/m³, 1.7× usual Yonezawa, 17 July: 11.4 µg/m³, 1.2× usual Sado Sado, 10 July: 4.1 µg/m³, 0.5× usual Sado, 11 July: 5.3 µg/m³, 0.6× usual Sado, 12 July: 12.0 µg/m³, 1.4× usual Sado, 13 July: 28.8 µg/m³, 3.4× usual Sado, 14 July: 30.5 µg/m³, 3.6× usual Sado, 15 July: 14.3 µg/m³, 1.7× usual Sado, 16 July: 8.4 µg/m³, 1.0× usual Sado, 17 July: 5.1 µg/m³, 0.6× usual Goshogawara Goshogawara, 10 July: 3.3 µg/m³, 0.5× usual Goshogawara, 11 July: 7.0 µg/m³, 1.0× usual Goshogawara, 12 July: 17.0 µg/m³, 2.4× usual Goshogawara, 13 July: 28.6 µg/m³, 4.0× usual Goshogawara, 14 July: 29.7 µg/m³, 4.2× usual Goshogawara, 15 July: 27.1 µg/m³, 3.8× usual Goshogawara, 16 July: 23.2 µg/m³, 3.3× usual Goshogawara, 17 July: 17.3 µg/m³, 2.4× usual Aomori Aomori, 10 July: 5.5 µg/m³, 0.7× usual Aomori, 11 July: 8.7 µg/m³, 1.1× usual Aomori, 12 July: 20.9 µg/m³, 2.7× usual Aomori, 13 July: 28.0 µg/m³, 3.6× usual Aomori, 14 July: 31.4 µg/m³, 4.0× usual Aomori, 15 July: 21.8 µg/m³, 2.8× usual Aomori, 16 July: 21.2 µg/m³, 2.7× usual Aomori, 17 July: 19.0 µg/m³, 2.4× usual Hakodate Hakodate, 10 July: 7.6 µg/m³, 1.1× usual Hakodate, 11 July: 10.4 µg/m³, 1.5× usual Hakodate, 12 July: 22.1 µg/m³, 3.2× usual Hakodate, 13 July: 27.9 µg/m³, 4.0× usual Hakodate, 14 July: 13.4 µg/m³, 1.9× usual Hakodate, 15 July: 16.0 µg/m³, 2.3× usual Hakodate, 16 July: 19.5 µg/m³, 2.8× usual Hakodate, 17 July: 15.3 µg/m³, 2.2× usual Hirosaki Hirosaki, 10 July: 5.9 µg/m³, 0.7× usual Hirosaki, 11 July: 7.7 µg/m³, 0.9× usual Hirosaki, 12 July: 21.5 µg/m³, 2.5× usual Hirosaki, 13 July: 27.9 µg/m³, 3.2× usual Hirosaki, 14 July: 32.4 µg/m³, 3.8× usual Hirosaki, 15 July: 32.0 µg/m³, 3.7× usual Hirosaki, 16 July: 28.3 µg/m³, 3.3× usual Hirosaki, 17 July: 22.0 µg/m³, 2.6× usual Shonai Shonai, 10 July: 5.2 µg/m³, 0.5× usual Shonai, 11 July: 5.0 µg/m³, 0.5× usual Shonai, 12 July: 12.3 µg/m³, 1.3× usual Shonai, 13 July: 27.7 µg/m³, 2.9× usual Shonai, 14 July: 29.6 µg/m³, 3.1× usual Shonai, 15 July: 20.8 µg/m³, 2.2× usual Shonai, 16 July: 24.0 µg/m³, 2.5× usual Shonai, 17 July: 14.5 µg/m³, 1.5× usual Hachinohe Hachinohe, 10 July: 6.1 µg/m³, 0.7× usual Hachinohe, 11 July: 7.0 µg/m³, 0.8× usual Hachinohe, 12 July: 15.7 µg/m³, 1.9× usual Hachinohe, 13 July: 27.6 µg/m³, 3.3× usual Hachinohe, 14 July: 23.0 µg/m³, 2.7× usual Hachinohe, 15 July: 21.4 µg/m³, 2.5× usual Hachinohe, 16 July: 24.1 µg/m³, 2.9× usual Hachinohe, 17 July: 18.5 µg/m³, 2.2× usual Nagai Nagai, 10 July: no reading Nagai, 11 July: no reading Nagai, 12 July: 9.2 µg/m³, 0.8× usual Nagai, 13 July: 26.0 µg/m³, 2.2× usual Nagai, 14 July: 36.1 µg/m³, 3.0× usual Nagai, 15 July: 11.7 µg/m³, 1.0× usual Nagai, 16 July: 16.7 µg/m³, 1.4× usual Nagai, 17 July: no reading Yokote Yokote, 10 July: 4.6 µg/m³, 0.6× usual Yokote, 11 July: 2.5 µg/m³, 0.3× usual Yokote, 12 July: 14.5 µg/m³, 1.9× usual Yokote, 13 July: 25.5 µg/m³, 3.3× usual Yokote, 14 July: 32.6 µg/m³, 4.2× usual Yokote, 15 July: 19.4 µg/m³, 2.5× usual Yokote, 16 July: 20.2 µg/m³, 2.6× usual Yokote, 17 July: 13.7 µg/m³, 1.8× usual Sakata Sakata, 10 July: 7.2 µg/m³, 0.7× usual Sakata, 11 July: 5.6 µg/m³, 0.5× usual Sakata, 12 July: 11.2 µg/m³, 1.1× usual Sakata, 13 July: 25.4 µg/m³, 2.4× usual Sakata, 14 July: 33.3 µg/m³, 3.2× usual Sakata, 15 July: 22.4 µg/m³, 2.1× usual Sakata, 16 July: 23.4 µg/m³, 2.2× usual Sakata, 17 July: 15.7 µg/m³, 1.5× usual Tsuruoka Tsuruoka, 10 July: 6.5 µg/m³, 0.7× usual Tsuruoka, 11 July: 6.4 µg/m³, 0.7× usual Tsuruoka, 12 July: 12.1 µg/m³, 1.2× usual Tsuruoka, 13 July: 25.2 µg/m³, 2.6× usual Tsuruoka, 14 July: 32.8 µg/m³, 3.3× usual Tsuruoka, 15 July: 19.2 µg/m³, 2.0× usual Tsuruoka, 16 July: 21.1 µg/m³, 2.2× usual Tsuruoka, 17 July: 14.3 µg/m³, 1.5× usual Niitsu-honchō Niitsu-honchō, 10 July: 3.5 µg/m³, 0.4× usual Niitsu-honchō, 11 July: 3.1 µg/m³, 0.4× usual Niitsu-honchō, 12 July: 6.1 µg/m³, 0.7× usual Niitsu-honchō, 13 July: 17.7 µg/m³, 2.0× usual Niitsu-honchō, 14 July: 32.0 µg/m³, 3.6× usual Niitsu-honchō, 15 July: 9.4 µg/m³, 1.1× usual Niitsu-honchō, 16 July: 9.1 µg/m³, 1.0× usual Niitsu-honchō, 17 July: 5.5 µg/m³, 0.6× usual Shibata Shibata, 10 July: 4.6 µg/m³, 0.5× usual Shibata, 11 July: 5.1 µg/m³, 0.5× usual Shibata, 12 July: 8.9 µg/m³, 0.9× usual Shibata, 13 July: 18.4 µg/m³, 1.9× usual Shibata, 14 July: 30.2 µg/m³, 3.1× usual Shibata, 15 July: 12.4 µg/m³, 1.3× usual Shibata, 16 July: 8.5 µg/m³, 0.9× usual Shibata, 17 July: 7.0 µg/m³, 0.7× usual Kameda-honchō Kameda-honchō, 10 July: 3.5 µg/m³, 0.4× usual Kameda-honchō, 11 July: 4.1 µg/m³, 0.5× usual Kameda-honchō, 12 July: 8.6 µg/m³, 1.0× usual Kameda-honchō, 13 July: 18.6 µg/m³, 2.2× usual Kameda-honchō, 14 July: 29.6 µg/m³, 3.5× usual Kameda-honchō, 15 July: 13.5 µg/m³, 1.6× usual Kameda-honchō, 16 July: 9.8 µg/m³, 1.2× usual Kameda-honchō, 17 July: 5.8 µg/m³, 0.7× usual Nagaoka Nagaoka, 10 July: 3.0 µg/m³, 0.3× usual Nagaoka, 11 July: 2.8 µg/m³, 0.3× usual Nagaoka, 12 July: 5.3 µg/m³, 0.6× usual Nagaoka, 13 July: 17.0 µg/m³, 1.9× usual Nagaoka, 14 July: 29.6 µg/m³, 3.3× usual Nagaoka, 15 July: 9.6 µg/m³, 1.1× usual Nagaoka, 16 July: 5.8 µg/m³, 0.7× usual Nagaoka, 17 July: 5.2 µg/m³, 0.6× usual Shirone Shirone, 10 July: 2.7 µg/m³, 0.3× usual Shirone, 11 July: 2.4 µg/m³, 0.3× usual Shirone, 12 July: 6.3 µg/m³, 0.8× usual Shirone, 13 July: 18.5 µg/m³, 2.3× usual Shirone, 14 July: 29.4 µg/m³, 3.6× usual Shirone, 15 July: 10.1 µg/m³, 1.2× usual Shirone, 16 July: 5.9 µg/m³, 0.7× usual Shirone, 17 July: 4.4 µg/m³, 0.5× usual Niigata Niigata, 10 July: 2.9 µg/m³, 0.3× usual Niigata, 11 July: 3.4 µg/m³, 0.4× usual Niigata, 12 July: 7.7 µg/m³, 0.9× usual Niigata, 13 July: 18.0 µg/m³, 2.1× usual Niigata, 14 July: 28.7 µg/m³, 3.3× usual Niigata, 15 July: 13.3 µg/m³, 1.5× usual Niigata, 16 July: 8.2 µg/m³, 1.0× usual Niigata, 17 July: 5.1 µg/m³, 0.6× usual Akita Akita, 10 July: 5.6 µg/m³, 0.7× usual Akita, 11 July: 3.4 µg/m³, 0.5× usual Akita, 12 July: 10.5 µg/m³, 1.4× usual Akita, 13 July: 22.4 µg/m³, 3.0× usual Akita, 14 July: 28.0 µg/m³, 3.7× usual Akita, 15 July: 21.0 µg/m³, 2.8× usual Akita, 16 July: 17.9 µg/m³, 2.4× usual Akita, 17 July: no reading Maki Maki, 10 July: 3.2 µg/m³, 0.4× usual Maki, 11 July: 2.3 µg/m³, 0.3× usual Maki, 12 July: 8.4 µg/m³, 1.0× usual Maki, 13 July: 18.2 µg/m³, 2.2× usual Maki, 14 July: 27.9 µg/m³, 3.4× usual Maki, 15 July: 11.9 µg/m³, 1.5× usual Maki, 16 July: 8.1 µg/m³, 1.0× usual Maki, 17 July: 4.2 µg/m³, 0.5× usual Oga Oga, 10 July: 5.3 µg/m³, 0.6× usual Oga, 11 July: 5.6 µg/m³, 0.6× usual Oga, 12 July: 12.0 µg/m³, 1.4× usual Oga, 13 July: 23.6 µg/m³, 2.7× usual Oga, 14 July: 27.9 µg/m³, 3.2× usual Oga, 15 July: 29.1 µg/m³, 3.3× usual Oga, 16 July: 23.1 µg/m³, 2.6× usual Oga, 17 July: 14.5 µg/m³, 1.6× usual Noshiro Noshiro, 10 July: 4.5 µg/m³, 0.5× usual Noshiro, 11 July: 6.1 µg/m³, 0.7× usual Noshiro, 12 July: 14.5 µg/m³, 1.7× usual Noshiro, 13 July: 21.7 µg/m³, 2.5× usual Noshiro, 14 July: 27.5 µg/m³, 3.2× usual Noshiro, 15 July: no reading Noshiro, 16 July: no reading Noshiro, 17 July: 14.8 µg/m³, 1.7× usual Ōdate Ōdate, 10 July: 3.4 µg/m³, 0.4× usual Ōdate, 11 July: no reading Ōdate, 12 July: no reading Ōdate, 13 July: 23.2 µg/m³, 2.8× usual Ōdate, 14 July: 27.1 µg/m³, 3.3× usual Ōdate, 15 July: no reading Ōdate, 16 July: no reading Ōdate, 17 July: 17.9 µg/m³, 2.2× usual Kōriyama Kōriyama, 10 July: 3.6 µg/m³, 0.4× usual Kōriyama, 11 July: 4.3 µg/m³, 0.5× usual Kōriyama, 12 July: 4.3 µg/m³, 0.5× usual Kōriyama, 13 July: 19.6 µg/m³, 2.1× usual Kōriyama, 14 July: 26.3 µg/m³, 2.8× usual Kōriyama, 15 July: 12.1 µg/m³, 1.3× usual Kōriyama, 16 July: 15.2 µg/m³, 1.6× usual Kōriyama, 17 July: 12.0 µg/m³, 1.3× usual Chikusei Chikusei, 10 July: 19.2 µg/m³, 1.9× usual Chikusei, 11 July: 18.2 µg/m³, 1.8× usual Chikusei, 12 July: 8.8 µg/m³, 0.9× usual Chikusei, 13 July: 18.4 µg/m³, 1.8× usual Chikusei, 14 July: 25.8 µg/m³, 2.6× usual Chikusei, 15 July: 11.7 µg/m³, 1.2× usual Chikusei, 16 July: 22.0 µg/m³, 2.2× usual Chikusei, 17 July: 13.5 µg/m³, 1.4× usual Aizu-Wakamatsu Aizu-Wakamatsu, 10 July: 2.0 µg/m³, 0.2× usual Aizu-Wakamatsu, 11 July: 1.9 µg/m³, 0.2× usual Aizu-Wakamatsu, 12 July: 3.6 µg/m³, 0.4× usual Aizu-Wakamatsu, 13 July: 18.1 µg/m³, 2.1× usual Aizu-Wakamatsu, 14 July: 25.5 µg/m³, 3.0× usual Aizu-Wakamatsu, 15 July: 8.3 µg/m³, 1.0× usual Aizu-Wakamatsu, 16 July: 9.4 µg/m³, 1.1× usual Aizu-Wakamatsu, 17 July: 5.4 µg/m³, 0.6× usual 10 Jul 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
Hanamaki Iwate, Japan 1 13 July 7.1 4.3× Takizawa Iwate, Japan 2 13 July 7.0 4.2× Goshogawara Aomori, Japan 2 14 July 7.1 4.2× Yokote Akita, Japan 2 14 July 7.8 4.2× Aomori Aomori, Japan 2 14 July 7.8 4.0× Hakodate Hokkaido, Japan 1 13 July 7.0 4.0× Morioka Iwate, Japan 2 13 July 8.2 4.0× Yamagata Yamagata, Japan 2 14 July 8.2 3.9× Hirosaki Aomori, Japan 2 14 July 8.6 3.8× Akita Akita, Japan 1 14 July 7.5 3.7× Ichinoseki Iwate, Japan 1 13 July 8.3 3.6× Niitsu-honchō Niigata, Japan 1 14 July 8.8 3.6× Sado Niigata, Japan 2 14 July 8.5 3.6× Shirone Niigata, Japan 1 14 July 8.2 3.6× Sagae Yamagata, Japan 2 13 July 10.0 3.5× Kameda-honchō Niigata, Japan 1 14 July 8.5 3.5× Higashine Yamagata, Japan 2 13 July 8.8 3.5× Maki Niigata, Japan 1 14 July 8.1 3.4× Yonezawa Yamagata, Japan 2 14 July 9.6 3.4× Tsuruoka Yamagata, Japan 2 14 July 9.8 3.3× Niigata Niigata, Japan 1 14 July 8.6 3.3× Nagaoka Niigata, Japan 1 14 July 8.9 3.3× Oga Akita, Japan 1 15 July 8.8 3.3× Ōdate Akita, Japan 1 14 July 8.2 3.3× Hachinohe Aomori, Japan 1 13 July 8.4 3.3× Noshiro Akita, Japan 1 14 July 8.6 3.2× Sakata Yamagata, Japan 2 14 July 10.5 3.2× Shonai Yamagata, Japan 2 14 July 9.6 3.1× Shibata Niigata, Japan 1 14 July 9.8 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. 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 22 of 39 episodes in Japan since our records began, by cities reached.
Japan, June and July 2025 508 Japan and South Korea, April 2024 499 Japan and South Korea, March 2025 454 Japan and South Korea, March 2026 305 Japan and South Korea, January 2025 274 Japan and South Korea, February and March 2025 192 Japan, 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, July 2024 33 Bars: cities reached; colour: the level of the episode's highest daily reading. All 39 .
Use this page SmogRank, Japan, July 2024: 33 cities with PM2.5 at twice their usual or more, 13 to 14 July 2024, smogrank.com/episodes/2024-07-japan (accessed 3 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.
