SmogRank / Episodes / Japan
Ibaraki and Kanagawa, Japan, July 2024
For 3 days, from 6 to 8 July 2024, 17 cities in Japan had PM2.5 at least twice their usual for the time of year. The worst reading was Chikusei, Ibaraki, Japan: 35.4 µg/m³ on 8 July, about 3.6× its usual 9.9.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 17 in 1 country
Days 3 6 to 8 July 2024
Worst day 8 July 11 cities counted
Furthest above usual 3.7× Tateyama
Day by day
Play 8 July 11 cities at twice their usual or more
Urayasu Tokyo Matsudo Sōka Kawaguchi Misato, Saitama Koshigaya Kamagaya Narashino Asaka Kashiwa Noborito Saitama Noda Niiza Azamino Yokohama Higashikurume Kasukabe Chiba Kodaira Fuchū Yachiyo Ichihara Kisarazu Kimitsu Higashimurayama Sodegaura Ageo Toride Tokorozawa Yotsukaidō Machida Jōsō Inzai Kawagoe Bandō Kukichūō Yamato Yokosuka Akishima Yokota Sayama Sakura Igusa Kamakura Ajiki Iruma Kurihama Fujisawa Kazo Kōnosu Hachiōji Atsugi Sakado Koga Ebina Minawa Yachimata Naka Hannō Narita Higashi-Matsuyama Shimo-tsuma Chigasaki Ōami Mobara Hanyū Morohongō Ōme Gyōda Miura Tōgane Kumagaya Oyama Tatebayashi Ogawamachi Hadano Minamibōsō Sano Menuma Tochigi Ōhara Ashikaga Katsuura Yorii Sōsa Ōta Kaminokawa Odawara Mooka Minamiashigara Chichibu Sakai-nakajima Honjō Omigawa Ōtsuki Kodamachō-kodamaminami Kiryū Kanuma Utsunomiya Hitachi-Naka Takasaki Choshi Nasukarasuyama Susono Fujiyoshida Imaichi Hitachiomiya Izunokuni Tomioka Numazu Yamanashi Yaita Shibukawa Numata Fuji Kofu Hitachi Fujinomiya Nasushiobara Nakanojō Shimoda Minami-Alps Saku Kitaibaraki Shirakawa Shizuoka Minamiuonuma Ueda Suwa Iwaki Fujieda Suzaka Kōriyama Aizu-Wakamatsu Shimada Ina Nagano Chikuma Matsumoto Kikugawa Iida Nagaoka Kakegawa Fukuroi Jōetsu Fukushima Iwata Hamakita Shirone Niitsu-honchō Yonezawa Maki Minami-Sōma Hamamatsu Kameda-honchō Shibata Niigata Itoigawa Sōma Nagai Shinshiro Shiroishi Kosai Kakuda Gero Toyohashi Takayama Nyūzen Iwanuma Toki Uozu Namerikawa Tajimi Gamagōri Toyota Tahara Okazaki Seto Sado Kani Toyama Minokamo Nisshin Owariasahi Anjō Chiryū Nishio Inuyama Imizu Sekimachi Kariya Hekinan Nagoya Kakamigahara Tōkai Minamichita Handa Takaoka Tonami Ichinomiya Ama Himimachi Gifu Tokoname Kaminoma Oyabe Motosu Hashima Nanao Mizuho Toba Kuwana Ōgaki Kaizu Tsubata Ibi Hakui Shima Yokkaichi Inabe Nonoichi Kanazawa Suzuka Ise Ono Matsutō Saikū Tsu Komatsu Matsusaka Kameyama Kaga Nagahama Hikone Fukui-shi Sabae Youkaichi Mikuni Kōka Tsuruga Ōmihachiman Iga Ueno-ebisumachi Takashima Nabari Kusatsu Kitahama Owase Ōtsu Obama Kizugawa Uji Jōyō Kumano Kyoto Sugai Tenri Nara-shi Kōtari Kashihara-shi Yawata Hōryūji Kashiwara Ikoma Hirakata Takatsuki Kameoka Shingū Yao Higashiosaka Nantan Habikino Tondabayashichō Yono Sayama Kawachi-Nagano Hashimoto Osaka Toyonaka Sakai Maizuru Amagasaki Izumi Takarazuka Ayabe Nishinomiya Kishiwada Miyazu Kinokawa Sandachō Izumisano Fukuchiyama Iwade Kobe Sennan Kyōtango Tanba Kainan Tanabe Minato Nishiwaki Akashi Arida Gobō Aihara Minamirinkan Tsuchiura Ayase Gotemba Hiratsuka Atami Inashiki Kamisu Kasama Mito Hokota Ishioka Kashima-shi Sawara Chikusei Tateyama 3 Jul 4 5 6 7 8 9 10 11 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
Ayase Ayase, 3 July: 22.9 µg/m³, 2.1× usual Ayase, 4 July: 30.1 µg/m³, 2.8× usual Ayase, 5 July: 28.1 µg/m³, 2.6× usual Ayase, 6 July: 30.6 µg/m³, 2.8× usual Ayase, 7 July: 27.3 µg/m³, 2.5× usual Ayase, 8 July: 29.6 µg/m³, 2.7× usual Ayase, 9 July: 23.3 µg/m³, 2.1× usual Ayase, 10 July: 15.2 µg/m³, 1.4× usual Ayase, 11 July: 10.7 µg/m³, 1.0× usual Minamirinkan Minamirinkan, 3 July: 19.5 µg/m³, 1.8× usual Minamirinkan, 4 July: 26.5 µg/m³, 2.5× usual Minamirinkan, 5 July: 22.2 µg/m³, 2.1× usual Minamirinkan, 6 July: 26.0 µg/m³, 2.5× usual Minamirinkan, 7 July: no reading Minamirinkan, 8 July: no reading Minamirinkan, 9 July: 18.6 µg/m³, 1.8× usual Minamirinkan, 10 July: 11.2 µg/m³, 1.1× usual Minamirinkan, 11 July: 8.7 µg/m³, 0.8× usual Atami Atami, 3 July: 17.7 µg/m³, 2.0× usual Atami, 4 July: 22.2 µg/m³, 2.6× usual Atami, 5 July: 29.6 µg/m³, 3.4× usual Atami, 6 July: 26.7 µg/m³, 3.1× usual Atami, 7 July: 21.3 µg/m³, 2.4× usual Atami, 8 July: 14.1 µg/m³, 1.6× usual Atami, 9 July: 12.1 µg/m³, 1.4× usual Atami, 10 July: 7.9 µg/m³, 0.9× usual Atami, 11 July: 2.6 µg/m³, 0.3× usual Gotemba Gotemba, 3 July: 22.6 µg/m³, 2.3× usual Gotemba, 4 July: 22.9 µg/m³, 2.3× usual Gotemba, 5 July: 26.9 µg/m³, 2.7× usual Gotemba, 6 July: 29.4 µg/m³, 2.9× usual Gotemba, 7 July: 28.5 µg/m³, 2.9× usual Gotemba, 8 July: 19.3 µg/m³, 1.9× usual Gotemba, 9 July: 17.8 µg/m³, 1.8× usual Gotemba, 10 July: 10.2 µg/m³, 1.0× usual Gotemba, 11 July: 5.6 µg/m³, 0.6× usual Chikusei Chikusei, 3 July: 13.3 µg/m³, 1.3× usual Chikusei, 4 July: 23.5 µg/m³, 2.4× usual Chikusei, 5 July: 20.2 µg/m³, 2.0× usual Chikusei, 6 July: 28.0 µg/m³, 2.8× usual Chikusei, 7 July: 26.6 µg/m³, 2.7× usual Chikusei, 8 July: 35.4 µg/m³, 3.6× usual Chikusei, 9 July: 32.9 µg/m³, 3.3× usual Chikusei, 10 July: 19.2 µg/m³, 1.9× usual Chikusei, 11 July: 18.2 µg/m³, 1.8× usual Aihara Aihara, 3 July: 18.5 µg/m³, 1.6× usual Aihara, 4 July: 24.7 µg/m³, 2.2× usual Aihara, 5 July: 23.5 µg/m³, 2.1× usual Aihara, 6 July: 27.5 µg/m³, 2.4× usual Aihara, 7 July: 25.0 µg/m³, 2.2× usual Aihara, 8 July: 21.8 µg/m³, 1.9× usual Aihara, 9 July: 18.3 µg/m³, 1.6× usual Aihara, 10 July: 10.8 µg/m³, 0.9× usual Aihara, 11 July: 8.8 µg/m³, 0.8× usual Kamisu Kamisu, 3 July: 9.8 µg/m³, 1.1× usual Kamisu, 4 July: 24.4 µg/m³, 2.6× usual Kamisu, 5 July: 22.0 µg/m³, 2.4× usual Kamisu, 6 July: 26.5 µg/m³, 2.8× usual Kamisu, 7 July: 27.6 µg/m³, 3.0× usual Kamisu, 8 July: 29.8 µg/m³, 3.2× usual Kamisu, 9 July: 22.1 µg/m³, 2.4× usual Kamisu, 10 July: 17.1 µg/m³, 1.8× usual Kamisu, 11 July: 9.8 µg/m³, 1.1× usual Tateyama Tateyama, 3 July: 18.9 µg/m³, 2.7× usual Tateyama, 4 July: 18.6 µg/m³, 2.7× usual Tateyama, 5 July: 23.7 µg/m³, 3.4× usual Tateyama, 6 July: 25.8 µg/m³, 3.7× usual Tateyama, 7 July: 21.8 µg/m³, 3.1× usual Tateyama, 8 July: 16.7 µg/m³, 2.4× usual Tateyama, 9 July: 16.2 µg/m³, 2.3× usual Tateyama, 10 July: 9.2 µg/m³, 1.3× usual Tateyama, 11 July: 8.6 µg/m³, 1.2× usual Hiratsuka Hiratsuka, 3 July: 16.8 µg/m³, 2.0× usual Hiratsuka, 4 July: 22.0 µg/m³, 2.7× usual Hiratsuka, 5 July: 21.3 µg/m³, 2.6× usual Hiratsuka, 6 July: 25.0 µg/m³, 3.0× usual Hiratsuka, 7 July: 23.6 µg/m³, 2.8× usual Hiratsuka, 8 July: 21.9 µg/m³, 2.6× usual Hiratsuka, 9 July: 17.0 µg/m³, 2.0× usual Hiratsuka, 10 July: 9.1 µg/m³, 1.1× usual Hiratsuka, 11 July: 7.2 µg/m³, 0.9× usual Mito Mito, 3 July: no reading Mito, 4 July: no reading Mito, 5 July: no reading Mito, 6 July: 18.7 µg/m³, 2.1× usual Mito, 7 July: 25.5 µg/m³, 2.9× usual Mito, 8 July: 29.4 µg/m³, 3.3× usual Mito, 9 July: 26.0 µg/m³, 3.0× usual Mito, 10 July: no reading Mito, 11 July: no reading Tsuchiura Tsuchiura, 3 July: 12.0 µg/m³, 1.1× usual Tsuchiura, 4 July: 17.3 µg/m³, 1.5× usual Tsuchiura, 5 July: 19.1 µg/m³, 1.7× usual Tsuchiura, 6 July: 24.5 µg/m³, 2.1× usual Tsuchiura, 7 July: 25.0 µg/m³, 2.2× usual Tsuchiura, 8 July: 32.0 µg/m³, 2.8× usual Tsuchiura, 9 July: 26.6 µg/m³, 2.3× usual Tsuchiura, 10 July: 16.8 µg/m³, 1.5× usual Tsuchiura, 11 July: 14.9 µg/m³, 1.3× usual Kashima-shi Kashima-shi, 3 July: 10.7 µg/m³, 1.2× usual Kashima-shi, 4 July: 20.1 µg/m³, 2.3× usual Kashima-shi, 5 July: 20.0 µg/m³, 2.3× usual Kashima-shi, 6 July: 20.4 µg/m³, 2.4× usual Kashima-shi, 7 July: 23.0 µg/m³, 2.7× usual Kashima-shi, 8 July: 30.5 µg/m³, 3.5× usual Kashima-shi, 9 July: 20.5 µg/m³, 2.4× usual Kashima-shi, 10 July: 14.8 µg/m³, 1.7× usual Kashima-shi, 11 July: 8.1 µg/m³, 0.9× usual Kasama Kasama, 3 July: 9.8 µg/m³, 1.1× usual Kasama, 4 July: 13.9 µg/m³, 1.5× usual Kasama, 5 July: 13.8 µg/m³, 1.5× usual Kasama, 6 July: 16.1 µg/m³, 1.7× usual Kasama, 7 July: 21.4 µg/m³, 2.3× usual Kasama, 8 July: 30.4 µg/m³, 3.3× usual Kasama, 9 July: 22.8 µg/m³, 2.5× usual Kasama, 10 July: 11.0 µg/m³, 1.2× usual Kasama, 11 July: 9.6 µg/m³, 1.0× usual Ishioka Ishioka, 3 July: 9.5 µg/m³, 1.2× usual Ishioka, 4 July: 14.0 µg/m³, 1.7× usual Ishioka, 5 July: 14.8 µg/m³, 1.8× usual Ishioka, 6 July: 17.6 µg/m³, 2.2× usual Ishioka, 7 July: 19.5 µg/m³, 2.4× usual Ishioka, 8 July: 28.3 µg/m³, 3.5× usual Ishioka, 9 July: 20.0 µg/m³, 2.5× usual Ishioka, 10 July: 10.4 µg/m³, 1.3× usual Ishioka, 11 July: 8.7 µg/m³, 1.1× usual Hokota Hokota, 3 July: 9.4 µg/m³, 1.2× usual Hokota, 4 July: 17.0 µg/m³, 2.2× usual Hokota, 5 July: 15.4 µg/m³, 2.0× usual Hokota, 6 July: 16.8 µg/m³, 2.2× usual Hokota, 7 July: 21.1 µg/m³, 2.7× usual Hokota, 8 July: 27.5 µg/m³, 3.5× usual Hokota, 9 July: 18.7 µg/m³, 2.4× usual Hokota, 10 July: 10.5 µg/m³, 1.3× usual Hokota, 11 July: 7.7 µg/m³, 1.0× usual Inashiki Inashiki, 3 July: 8.9 µg/m³, 1.1× usual Inashiki, 4 July: 16.8 µg/m³, 2.1× usual Inashiki, 5 July: 14.1 µg/m³, 1.7× usual Inashiki, 6 July: 16.9 µg/m³, 2.1× usual Inashiki, 7 July: 18.2 µg/m³, 2.2× usual Inashiki, 8 July: 26.3 µg/m³, 3.2× usual Inashiki, 9 July: 17.2 µg/m³, 2.1× usual Inashiki, 10 July: 13.3 µg/m³, 1.6× usual Inashiki, 11 July: 8.4 µg/m³, 1.0× usual Sawara Sawara, 3 July: 9.2 µg/m³, 1.3× usual Sawara, 4 July: 18.5 µg/m³, 2.5× usual Sawara, 5 July: 18.7 µg/m³, 2.6× usual Sawara, 6 July: 18.2 µg/m³, 2.5× usual Sawara, 7 July: 20.2 µg/m³, 2.8× usual Sawara, 8 July: 26.1 µg/m³, 3.6× usual Sawara, 9 July: 19.3 µg/m³, 2.6× usual Sawara, 10 July: 13.2 µg/m³, 1.8× usual Sawara, 11 July: 7.5 µg/m³, 1.0× usual 3 Jul 4 5 6 7 8 9 10 11 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
Tateyama Chiba, Japan 1 6 July 7.0 3.7× Chikusei Ibaraki, Japan 3 8 July 9.9 3.6× Sawara Chiba, Japan 1 8 July 7.3 3.6× Kashima-shi Ibaraki, Japan 1 8 July 8.6 3.5× Hokota Ibaraki, Japan 1 8 July 7.8 3.5× Ishioka Ibaraki, Japan 1 8 July 8.1 3.5× Atami Shizuoka, Japan 1 5 July 8.7 3.4× Mito Ibaraki, Japan 2 8 July 8.8 3.3× Kasama Ibaraki, Japan 1 8 July 9.3 3.3× Inashiki Ibaraki, Japan 1 8 July 8.1 3.2× Kamisu Ibaraki, Japan 3 8 July 9.3 3.2× Hiratsuka Kanagawa, Japan 1 6 July 8.3 3.0× Gotemba Shizuoka, Japan 2 6 July 10.0 2.9× Ayase Kanagawa, Japan 3 6 July 10.9 2.8× Tsuchiura Ibaraki, Japan 2 8 July 11.4 2.8× Minamirinkan Kanagawa, Japan 1 4 July 10.6 2.5× Aihara Kanagawa, Japan 2 6 July 11.4 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 30 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 Ibaraki and Kanagawa, Japan, July 2024 17 Bars: cities reached; colour: the level of the episode's highest daily reading. All 39 .
Use this page SmogRank, Ibaraki and Kanagawa, Japan, July 2024: 17 cities with PM2.5 at twice their usual or more, 6 to 8 July 2024, smogrank.com/episodes/2024-07-ibaraki-and-kanagawa-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.
