SmogRank / Episodes / Japan
Japan, 11 to 12 February 2024
For 2 days, from 11 to 12 February 2024, 85 cities in Japan had PM2.5 at least twice their usual for the time of year. The worst reading was Maebaru-chūō, Fukuoka, Japan: 46.5 µg/m³ on 11 February, about 4.5× its usual 10.4.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 85 in 1 country
Days 2 11 to 12 February 2024
Worst day 11 February 85 cities counted
Furthest above usual 7.2× Iki
Day by day
Play 11 February 85 cities at twice their usual or more
Kanoya Kirishima Mie Tsukumiura Usuki Nakamura Yufu Uwajima Yawatahama Kunisaki Hita Susaki Shinagawa Yanai Kudamatsu Ino Kochi Hōfu Nankoku Iwakuni Saijō Ōtake Yamaguchi Imabari Aki Mine Hiroshima Hagi Gion Takehara Higashihiroshima Mihara Ikedachō Onomichi Masuda Yae Shin’ichi Mima Takinomiya Hamada Miyoshi Yoshinogawa Asakuchi Kamojimachō-jōgejima Hiragi Takamatsu Gōtsuchō Kurashiki Anan Sōja Tokushima Takahashi Okayama Niimi Gobō Bizen Kariya Tanabe Sumoto Aioi Minato Kainan Tatsuno Ikaruga Himeji Iwade Higashinozoe Kakogawachō-honmachi Akashi Kinokawa Ono Kobe Shingū Nishiwaki Hashimoto Nishinomiya Sandachō Amagasaki Takarazuka Kumano Toyonaka Kashiwara Kashihara-shi Hōryūji Ikoma Owase Tenri Nara-shi Sugai Yawata Kameoka Kizugawa Kōtari Jōyō Uji Nabari Kyoto Ōtsu Ueno-ebisumachi Iga Kusatsu Kōka Matsusaka Saikū Tsu Ise Kameyama Suzuka Yokkaichi Beppu Shido Hyūga Tamano Onoda Fukuyama Matsuyama Hikari Niihama Iyo Kan’onjichō Shikokuchūō Saiki Sendai Ogōri Takanabe Miyakonojō Shūnan Kure Arida Ube Ōmuta Kasaoka Nōgata Tagawa Kanda Nichinan Kanzakimachi-kanzaki Saga Tosu Nobeoka Yanagawa Ōita Kaseda-shirakame Kasuga Nagato Taku Nakatsu Chikugo Narutochō-mitsuishi Ukiha Shimonoseki Koga Tanushimarumachi-toyoki Zentsujichó Marugame Minamikyushu Amami Shintomi Yukuhashi Iizuka Fukuoka Higashigō Yame Miyazaki Kitakyushu Kagoshima Izumi Tsurusaki Nakama Kurume Kobayashi Koga Takeo Kashima Imarichō-kō Maebaru-chūō Buzen Kushikino Sasebo Munakata Wakasugi Togitsu Isahaya Itoshima Nagasaki Ureshinomachi-shimojuku Karatsu Ōmura Matsuura Obita Gotō Tsushima Saikai Iki 8 Feb 9 10 11 12 13 14 15 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
Maebaru-chūō Maebaru-chūō, 8 February: 6.3 µg/m³ Maebaru-chūō, 9 February: 10.9 µg/m³ Maebaru-chūō, 10 February: 14.6 µg/m³ Maebaru-chūō, 11 February: 46.5 µg/m³, 4.5× its usual 10.4 Maebaru-chūō, 12 February: 26.9 µg/m³, 2.7× its usual 10.1 Maebaru-chūō, 13 February: 21.3 µg/m³ Maebaru-chūō, 14 February: 15.0 µg/m³ Maebaru-chūō, 15 February: 11.3 µg/m³ Tsushima Tsushima, 8 February: 4.1 µg/m³ Tsushima, 9 February: 10.6 µg/m³ Tsushima, 10 February: 13.6 µg/m³ Tsushima, 11 February: 45.5 µg/m³, 6.4× its usual 7.1 Tsushima, 12 February: 23.0 µg/m³ Tsushima, 13 February: 12.9 µg/m³ Tsushima, 14 February: 10.0 µg/m³ Tsushima, 15 February: 6.0 µg/m³ Sasebo Sasebo, 8 February: 5.4 µg/m³ Sasebo, 9 February: 7.6 µg/m³ Sasebo, 10 February: 14.1 µg/m³ Sasebo, 11 February: 42.3 µg/m³, 4.6× its usual 9.1 Sasebo, 12 February: 20.9 µg/m³ Sasebo, 13 February: 16.1 µg/m³ Sasebo, 14 February: 14.4 µg/m³ Sasebo, 15 February: 9.4 µg/m³ Gotō Gotō, 8 February: 7.5 µg/m³ Gotō, 9 February: 6.8 µg/m³ Gotō, 10 February: 21.3 µg/m³ Gotō, 11 February: 41.9 µg/m³, 6.2× its usual 6.8 Gotō, 12 February: 24.2 µg/m³ Gotō, 13 February: 12.0 µg/m³ Gotō, 14 February: 9.0 µg/m³ Gotō, 15 February: 6.5 µg/m³ Ōmura Ōmura, 8 February: 4.1 µg/m³ Ōmura, 9 February: 6.6 µg/m³ Ōmura, 10 February: 13.1 µg/m³ Ōmura, 11 February: 41.9 µg/m³, 5.7× its usual 7.3 Ōmura, 12 February: 19.3 µg/m³ Ōmura, 13 February: 15.0 µg/m³ Ōmura, 14 February: 14.3 µg/m³ Ōmura, 15 February: 8.1 µg/m³ Tanushimarumachi-to… Tanushimarumachi-toyoki, 8 February: 8.6 µg/m³ Tanushimarumachi-toyoki, 9 February: 9.6 µg/m³ Tanushimarumachi-toyoki, 10 February: 17.0 µg/m³ Tanushimarumachi-toyoki, 11 February: 41.8 µg/m³, 3.9× its usual 10.8 Tanushimarumachi-toyoki, 12 February: 27.8 µg/m³, 2.6× its usual 10.7 Tanushimarumachi-toyoki, 13 February: 19.5 µg/m³ Tanushimarumachi-toyoki, 14 February: 21.1 µg/m³ Tanushimarumachi-toyoki, 15 February: 16.5 µg/m³ Saikai Saikai, 8 February: 3.0 µg/m³ Saikai, 9 February: 5.6 µg/m³ Saikai, 10 February: 11.9 µg/m³ Saikai, 11 February: 41.2 µg/m³, 6.9× its usual 6.0 Saikai, 12 February: 18.6 µg/m³ Saikai, 13 February: 11.0 µg/m³ Saikai, 14 February: 10.3 µg/m³ Saikai, 15 February: 6.2 µg/m³ Matsuura Matsuura, 8 February: 3.9 µg/m³ Matsuura, 9 February: 7.3 µg/m³ Matsuura, 10 February: 12.3 µg/m³ Matsuura, 11 February: 40.8 µg/m³, 5.8× its usual 7.0 Matsuura, 12 February: 19.9 µg/m³ Matsuura, 13 February: 13.7 µg/m³ Matsuura, 14 February: 11.2 µg/m³ Matsuura, 15 February: 7.3 µg/m³ Ureshinomachi-shimo… Ureshinomachi-shimojuku, 8 February: 5.3 µg/m³ Ureshinomachi-shimojuku, 9 February: 7.3 µg/m³ Ureshinomachi-shimojuku, 10 February: 14.2 µg/m³ Ureshinomachi-shimojuku, 11 February: 40.5 µg/m³, 5.1× its usual 7.9 Ureshinomachi-shimojuku, 12 February: 19.0 µg/m³ Ureshinomachi-shimojuku, 13 February: 15.1 µg/m³ Ureshinomachi-shimojuku, 14 February: 16.6 µg/m³ Ureshinomachi-shimojuku, 15 February: 13.5 µg/m³ Nagasaki Nagasaki, 8 February: 4.5 µg/m³ Nagasaki, 9 February: 5.9 µg/m³ Nagasaki, 10 February: 13.5 µg/m³ Nagasaki, 11 February: 40.1 µg/m³, 5.0× its usual 8.1 Nagasaki, 12 February: 17.6 µg/m³ Nagasaki, 13 February: 14.2 µg/m³ Nagasaki, 14 February: 13.9 µg/m³ Nagasaki, 15 February: 7.1 µg/m³ Itoshima Itoshima, 8 February: 5.0 µg/m³ Itoshima, 9 February: 9.1 µg/m³ Itoshima, 10 February: 12.3 µg/m³ Itoshima, 11 February: 40.1 µg/m³, 5.0× its usual 8.1 Itoshima, 12 February: 24.1 µg/m³ Itoshima, 13 February: 15.8 µg/m³ Itoshima, 14 February: 12.8 µg/m³ Itoshima, 15 February: 8.6 µg/m³ Togitsu Togitsu, 8 February: 5.6 µg/m³ Togitsu, 9 February: 7.5 µg/m³ Togitsu, 10 February: 15.3 µg/m³ Togitsu, 11 February: 40.1 µg/m³, 4.8× its usual 8.3 Togitsu, 12 February: 21.6 µg/m³ Togitsu, 13 February: 16.7 µg/m³ Togitsu, 14 February: 15.4 µg/m³ Togitsu, 15 February: 9.6 µg/m³ Iki Iki, 8 February: 2.1 µg/m³ Iki, 9 February: 5.9 µg/m³ Iki, 10 February: 12.1 µg/m³ Iki, 11 February: 39.8 µg/m³, 7.2× its usual 5.5 Iki, 12 February: 18.1 µg/m³ Iki, 13 February: 11.8 µg/m³ Iki, 14 February: 10.0 µg/m³ Iki, 15 February: 6.0 µg/m³ Imarichō-kō Imarichō-kō, 8 February: 7.3 µg/m³ Imarichō-kō, 9 February: 9.6 µg/m³ Imarichō-kō, 10 February: 14.4 µg/m³ Imarichō-kō, 11 February: 39.3 µg/m³, 4.5× its usual 8.7 Imarichō-kō, 12 February: 22.5 µg/m³ Imarichō-kō, 13 February: 18.7 µg/m³ Imarichō-kō, 14 February: 17.8 µg/m³ Imarichō-kō, 15 February: 12.3 µg/m³ Kashima Kashima, 8 February: 6.4 µg/m³ Kashima, 9 February: 7.4 µg/m³ Kashima, 10 February: 14.0 µg/m³ Kashima, 11 February: 39.0 µg/m³, 4.5× its usual 8.6 Kashima, 12 February: 20.9 µg/m³ Kashima, 13 February: 17.9 µg/m³ Kashima, 14 February: 18.7 µg/m³ Kashima, 15 February: 15.0 µg/m³ Karatsu Karatsu, 8 February: 5.3 µg/m³ Karatsu, 9 February: 8.1 µg/m³ Karatsu, 10 February: 13.2 µg/m³ Karatsu, 11 February: 38.8 µg/m³, 5.3× its usual 7.3 Karatsu, 12 February: 19.8 µg/m³ Karatsu, 13 February: 15.0 µg/m³ Karatsu, 14 February: 13.6 µg/m³ Karatsu, 15 February: 9.6 µg/m³ Higashigō Higashigō, 8 February: 9.0 µg/m³ Higashigō, 9 February: 11.3 µg/m³ Higashigō, 10 February: 14.1 µg/m³ Higashigō, 11 February: 37.6 µg/m³, 4.0× its usual 9.3 Higashigō, 12 February: 25.0 µg/m³, 2.7× its usual 9.1 Higashigō, 13 February: 27.2 µg/m³ Higashigō, 14 February: 21.0 µg/m³ Higashigō, 15 February: 13.5 µg/m³ Obita Obita, 8 February: 4.7 µg/m³ Obita, 9 February: 5.3 µg/m³ Obita, 10 February: 13.5 µg/m³ Obita, 11 February: 37.5 µg/m³, 6.0× its usual 6.3 Obita, 12 February: 17.5 µg/m³ Obita, 13 February: 13.0 µg/m³ Obita, 14 February: 14.0 µg/m³ Obita, 15 February: 8.8 µg/m³ Takeo Takeo, 8 February: 6.5 µg/m³ Takeo, 9 February: 7.5 µg/m³ Takeo, 10 February: 12.2 µg/m³ Takeo, 11 February: 37.0 µg/m³, 4.5× its usual 8.3 Takeo, 12 February: 20.5 µg/m³ Takeo, 13 February: 18.2 µg/m³ Takeo, 14 February: 18.8 µg/m³ Takeo, 15 February: 13.8 µg/m³ Fukuoka Fukuoka, 8 February: 5.6 µg/m³ Fukuoka, 9 February: 8.9 µg/m³ Fukuoka, 10 February: 12.5 µg/m³ Fukuoka, 11 February: 36.9 µg/m³, 4.0× its usual 9.3 Fukuoka, 12 February: 24.0 µg/m³ Fukuoka, 13 February: 18.1 µg/m³ Fukuoka, 14 February: 14.4 µg/m³ Fukuoka, 15 February: 11.0 µg/m³ Miyakonojō Miyakonojō, 8 February: 14.7 µg/m³ Miyakonojō, 9 February: 11.2 µg/m³ Miyakonojō, 10 February: 14.6 µg/m³ Miyakonojō, 11 February: 36.8 µg/m³, 3.3× its usual 11.2 Miyakonojō, 12 February: 23.1 µg/m³ Miyakonojō, 13 February: 20.8 µg/m³ Miyakonojō, 14 February: 16.6 µg/m³ Miyakonojō, 15 February: 12.4 µg/m³ Koga Koga, 8 February: 6.0 µg/m³ Koga, 9 February: 9.1 µg/m³ Koga, 10 February: 10.2 µg/m³ Koga, 11 February: 36.7 µg/m³, 4.5× its usual 8.1 Koga, 12 February: 24.3 µg/m³ Koga, 13 February: 14.1 µg/m³ Koga, 14 February: 12.0 µg/m³ Koga, 15 February: 6.9 µg/m³ Ōmuta Ōmuta, 8 February: 9.2 µg/m³ Ōmuta, 9 February: 8.7 µg/m³ Ōmuta, 10 February: 16.4 µg/m³ Ōmuta, 11 February: 36.4 µg/m³, 3.4× its usual 10.8 Ōmuta, 12 February: 24.4 µg/m³ Ōmuta, 13 February: 20.0 µg/m³ Ōmuta, 14 February: 21.8 µg/m³ Ōmuta, 15 February: 16.8 µg/m³ Chikugo Chikugo, 8 February: 9.0 µg/m³ Chikugo, 9 February: 10.7 µg/m³ Chikugo, 10 February: 15.4 µg/m³ Chikugo, 11 February: 36.2 µg/m³, 3.8× its usual 9.5 Chikugo, 12 February: 27.4 µg/m³, 2.9× its usual 9.5 Chikugo, 13 February: 20.4 µg/m³ Chikugo, 14 February: 22.0 µg/m³ Chikugo, 15 February: 14.0 µg/m³ Kushikino Kushikino, 8 February: 6.7 µg/m³ Kushikino, 9 February: 5.1 µg/m³ Kushikino, 10 February: 14.0 µg/m³ Kushikino, 11 February: 35.8 µg/m³, 4.6× its usual 7.8 Kushikino, 12 February: 16.5 µg/m³ Kushikino, 13 February: 15.1 µg/m³ Kushikino, 14 February: 8.3 µg/m³ Kushikino, 15 February: 7.5 µg/m³ Isahaya Isahaya, 8 February: no reading Isahaya, 9 February: 4.3 µg/m³ Isahaya, 10 February: 12.6 µg/m³ Isahaya, 11 February: 35.5 µg/m³, 5.0× its usual 7.1 Isahaya, 12 February: 19.3 µg/m³ Isahaya, 13 February: 15.4 µg/m³ Isahaya, 14 February: 14.9 µg/m³ Isahaya, 15 February: 11.6 µg/m³ Kagoshima Kagoshima, 8 February: 8.0 µg/m³ Kagoshima, 9 February: 6.1 µg/m³ Kagoshima, 10 February: 12.5 µg/m³ Kagoshima, 11 February: 35.3 µg/m³, 4.1× its usual 8.7 Kagoshima, 12 February: 19.1 µg/m³ Kagoshima, 13 February: 17.7 µg/m³ Kagoshima, 14 February: 13.5 µg/m³ Kagoshima, 15 February: 8.4 µg/m³ Munakata Munakata, 8 February: 5.7 µg/m³ Munakata, 9 February: 8.5 µg/m³ Munakata, 10 February: 9.5 µg/m³ Munakata, 11 February: 35.2 µg/m³, 4.7× its usual 7.5 Munakata, 12 February: 23.6 µg/m³ Munakata, 13 February: 14.8 µg/m³ Munakata, 14 February: 11.4 µg/m³ Munakata, 15 February: 7.1 µg/m³ Kitakyushu Kitakyushu, 8 February: 7.1 µg/m³ Kitakyushu, 9 February: 9.5 µg/m³ Kitakyushu, 10 February: 9.2 µg/m³ Kitakyushu, 11 February: 35.0 µg/m³, 4.1× its usual 8.6 Kitakyushu, 12 February: 24.0 µg/m³ Kitakyushu, 13 February: 19.0 µg/m³ Kitakyushu, 14 February: 17.7 µg/m³ Kitakyushu, 15 February: 13.6 µg/m³ Wakasugi Wakasugi, 8 February: 2.8 µg/m³ Wakasugi, 9 February: 7.3 µg/m³ Wakasugi, 10 February: 8.9 µg/m³ Wakasugi, 11 February: 34.8 µg/m³, 4.8× its usual 7.3 Wakasugi, 12 February: 21.8 µg/m³ Wakasugi, 13 February: 12.9 µg/m³ Wakasugi, 14 February: 12.3 µg/m³ Wakasugi, 15 February: 6.9 µg/m³ Tsurusaki Tsurusaki, 8 February: 7.9 µg/m³ Tsurusaki, 9 February: 5.7 µg/m³ Tsurusaki, 10 February: 10.0 µg/m³ Tsurusaki, 11 February: 34.5 µg/m³, 4.3× its usual 8.1 Tsurusaki, 12 February: 25.6 µg/m³, 3.2× its usual 8.1 Tsurusaki, 13 February: 22.8 µg/m³ Tsurusaki, 14 February: 19.2 µg/m³ Tsurusaki, 15 February: 13.8 µg/m³ Iizuka Iizuka, 8 February: 5.6 µg/m³ Iizuka, 9 February: 8.1 µg/m³ Iizuka, 10 February: 9.9 µg/m³ Iizuka, 11 February: 34.5 µg/m³, 4.0× its usual 8.6 Iizuka, 12 February: 23.3 µg/m³ Iizuka, 13 February: 17.1 µg/m³ Iizuka, 14 February: 14.7 µg/m³ Iizuka, 15 February: 9.3 µg/m³ Izumi Izumi, 8 February: 7.6 µg/m³ Izumi, 9 February: 6.2 µg/m³ Izumi, 10 February: 12.8 µg/m³ Izumi, 11 February: 34.4 µg/m³, 4.2× its usual 8.1 Izumi, 12 February: 16.6 µg/m³ Izumi, 13 February: 15.2 µg/m³ Izumi, 14 February: 10.6 µg/m³ Izumi, 15 February: 7.2 µg/m³ Nakatsu Nakatsu, 8 February: 6.7 µg/m³ Nakatsu, 9 February: 7.0 µg/m³ Nakatsu, 10 February: 11.7 µg/m³ Nakatsu, 11 February: 34.2 µg/m³, 3.8× its usual 9.1 Nakatsu, 12 February: 26.5 µg/m³, 2.9× its usual 9.1 Nakatsu, 13 February: 20.6 µg/m³ Nakatsu, 14 February: 18.5 µg/m³ Nakatsu, 15 February: 20.1 µg/m³ Koga Koga, 8 February: 8.3 µg/m³ Koga, 9 February: 10.0 µg/m³ Koga, 10 February: 10.6 µg/m³ Koga, 11 February: 33.9 µg/m³, 3.9× its usual 8.7 Koga, 12 February: 25.4 µg/m³, 2.9× its usual 8.8 Koga, 13 February: 18.6 µg/m³ Koga, 14 February: 16.2 µg/m³ Koga, 15 February: 10.7 µg/m³ Kurume Kurume, 8 February: 7.3 µg/m³ Kurume, 9 February: 8.4 µg/m³ Kurume, 10 February: 12.0 µg/m³ Kurume, 11 February: 33.6 µg/m³, 4.4× its usual 7.7 Kurume, 12 February: 22.8 µg/m³ Kurume, 13 February: 18.2 µg/m³ Kurume, 14 February: 18.0 µg/m³ Kurume, 15 February: 13.8 µg/m³ Buzen Buzen, 8 February: 3.6 µg/m³ Buzen, 9 February: 4.6 µg/m³ Buzen, 10 February: 8.8 µg/m³ Buzen, 11 February: 33.0 µg/m³, 4.6× its usual 7.2 Buzen, 12 February: 24.1 µg/m³ Buzen, 13 February: 17.1 µg/m³ Buzen, 14 February: 14.8 µg/m³ Buzen, 15 February: 14.2 µg/m³ Shimonoseki Shimonoseki, 8 February: 3.2 µg/m³ Shimonoseki, 9 February: 7.8 µg/m³ Shimonoseki, 10 February: 10.8 µg/m³ Shimonoseki, 11 February: 32.8 µg/m³, 3.9× its usual 8.5 Shimonoseki, 12 February: 21.9 µg/m³ Shimonoseki, 13 February: 23.0 µg/m³ Shimonoseki, 14 February: 21.0 µg/m³ Shimonoseki, 15 February: 15.5 µg/m³ Ukiha Ukiha, 8 February: 6.6 µg/m³ Ukiha, 9 February: 8.6 µg/m³ Ukiha, 10 February: 12.0 µg/m³ Ukiha, 11 February: 32.7 µg/m³, 3.9× its usual 8.4 Ukiha, 12 February: 25.4 µg/m³, 3.0× its usual 8.4 Ukiha, 13 February: 17.7 µg/m³ Ukiha, 14 February: 16.1 µg/m³ Ukiha, 15 February: 14.0 µg/m³ Miyazaki Miyazaki, 8 February: 11.1 µg/m³ Miyazaki, 9 February: 8.3 µg/m³ Miyazaki, 10 February: 9.7 µg/m³ Miyazaki, 11 February: 32.6 µg/m³, 4.1× its usual 8.0 Miyazaki, 12 February: 21.1 µg/m³ Miyazaki, 13 February: 17.9 µg/m³ Miyazaki, 14 February: 13.8 µg/m³ Miyazaki, 15 February: 8.8 µg/m³ Tosu Tosu, 8 February: 7.8 µg/m³ Tosu, 9 February: 8.5 µg/m³ Tosu, 10 February: 13.5 µg/m³ Tosu, 11 February: 32.6 µg/m³, 3.6× its usual 9.0 Tosu, 12 February: 22.2 µg/m³ Tosu, 13 February: 18.6 µg/m³ Tosu, 14 February: 15.7 µg/m³ Tosu, 15 February: 14.1 µg/m³ Yukuhashi Yukuhashi, 8 February: 4.7 µg/m³ Yukuhashi, 9 February: 8.3 µg/m³ Yukuhashi, 10 February: 8.6 µg/m³ Yukuhashi, 11 February: 32.5 µg/m³, 4.0× its usual 8.1 Yukuhashi, 12 February: 26.9 µg/m³, 3.3× its usual 8.1 Yukuhashi, 13 February: 21.1 µg/m³ Yukuhashi, 14 February: 21.7 µg/m³ Yukuhashi, 15 February: 18.3 µg/m³ Taku Taku, 8 February: 7.1 µg/m³ Taku, 9 February: 9.0 µg/m³ Taku, 10 February: 12.3 µg/m³ Taku, 11 February: 32.5 µg/m³, 3.8× its usual 8.5 Taku, 12 February: 21.6 µg/m³ Taku, 13 February: 19.7 µg/m³ Taku, 14 February: 15.7 µg/m³ Taku, 15 February: 11.6 µg/m³ Yame Yame, 8 February: 5.1 µg/m³ Yame, 9 February: 5.8 µg/m³ Yame, 10 February: 12.3 µg/m³ Yame, 11 February: 32.4 µg/m³, 4.1× its usual 7.9 Yame, 12 February: 21.5 µg/m³ Yame, 13 February: 14.0 µg/m³ Yame, 14 February: 16.7 µg/m³ Yame, 15 February: 9.6 µg/m³ Nagato Nagato, 8 February: 3.6 µg/m³ Nagato, 9 February: no reading Nagato, 10 February: 11.0 µg/m³ Nagato, 11 February: 32.3 µg/m³, 3.8× its usual 8.5 Nagato, 12 February: 22.2 µg/m³ Nagato, 13 February: 16.9 µg/m³ Nagato, 14 February: 13.8 µg/m³ Nagato, 15 February: 8.9 µg/m³ Saga Saga, 8 February: 8.0 µg/m³ Saga, 9 February: 7.4 µg/m³ Saga, 10 February: 13.4 µg/m³ Saga, 11 February: 32.3 µg/m³, 3.6× its usual 8.9 Saga, 12 February: 22.8 µg/m³ Saga, 13 February: 17.5 µg/m³ Saga, 14 February: 17.0 µg/m³ Saga, 15 February: 11.2 µg/m³ Tagawa Tagawa, 8 February: 7.2 µg/m³ Tagawa, 9 February: 9.5 µg/m³ Tagawa, 10 February: 10.5 µg/m³ Tagawa, 11 February: 32.2 µg/m³, 3.5× its usual 9.1 Tagawa, 12 February: 23.7 µg/m³ Tagawa, 13 February: 17.5 µg/m³ Tagawa, 14 February: 17.7 µg/m³ Tagawa, 15 February: 11.4 µg/m³ Nakama Nakama, 8 February: 4.5 µg/m³ Nakama, 9 February: 8.2 µg/m³ Nakama, 10 February: 6.5 µg/m³ Nakama, 11 February: 32.1 µg/m³, 4.4× its usual 7.3 Nakama, 12 February: 22.6 µg/m³ Nakama, 13 February: 15.6 µg/m³ Nakama, 14 February: 13.7 µg/m³ Nakama, 15 February: 7.5 µg/m³ Kanzakimachi-kanzaki Kanzakimachi-kanzaki, 8 February: 7.6 µg/m³ Kanzakimachi-kanzaki, 9 February: 8.4 µg/m³ Kanzakimachi-kanzaki, 10 February: 12.0 µg/m³ Kanzakimachi-kanzaki, 11 February: 32.0 µg/m³, 3.6× its usual 8.9 Kanzakimachi-kanzaki, 12 February: 22.0 µg/m³ Kanzakimachi-kanzaki, 13 February: 18.2 µg/m³ Kanzakimachi-kanzaki, 14 February: 17.0 µg/m³ Kanzakimachi-kanzaki, 15 February: 11.2 µg/m³ Nōgata Nōgata, 8 February: 8.2 µg/m³ Nōgata, 9 February: 10.3 µg/m³ Nōgata, 10 February: 9.3 µg/m³ Nōgata, 11 February: 31.8 µg/m³, 3.5× its usual 9.0 Nōgata, 12 February: 25.1 µg/m³, 2.9× its usual 8.7 Nōgata, 13 February: 17.2 µg/m³ Nōgata, 14 February: 13.8 µg/m³ Nōgata, 15 February: 11.0 µg/m³ Kasuga Kasuga, 8 February: 5.9 µg/m³ Kasuga, 9 February: 8.4 µg/m³ Kasuga, 10 February: 10.5 µg/m³ Kasuga, 11 February: 31.7 µg/m³, 3.8× its usual 8.3 Kasuga, 12 February: 22.7 µg/m³ Kasuga, 13 February: 17.3 µg/m³ Kasuga, 14 February: 15.3 µg/m³ Kasuga, 15 February: 11.0 µg/m³ Kobayashi Kobayashi, 8 February: 8.6 µg/m³ Kobayashi, 9 February: 6.1 µg/m³ Kobayashi, 10 February: 11.0 µg/m³ Kobayashi, 11 February: 31.5 µg/m³, 4.5× its usual 7.0 Kobayashi, 12 February: 19.1 µg/m³ Kobayashi, 13 February: 18.6 µg/m³ Kobayashi, 14 February: 13.9 µg/m³ Kobayashi, 15 February: 9.3 µg/m³ Takanabe Takanabe, 8 February: 10.2 µg/m³ Takanabe, 9 February: 10.5 µg/m³ Takanabe, 10 February: 9.8 µg/m³ Takanabe, 11 February: 31.4 µg/m³, 3.3× its usual 9.5 Takanabe, 12 February: 23.4 µg/m³ Takanabe, 13 February: 17.3 µg/m³ Takanabe, 14 February: 14.7 µg/m³ Takanabe, 15 February: 9.3 µg/m³ Yanagawa Yanagawa, 8 February: 7.3 µg/m³ Yanagawa, 9 February: 8.0 µg/m³ Yanagawa, 10 February: 13.1 µg/m³ Yanagawa, 11 February: 31.1 µg/m³, 3.7× its usual 8.3 Yanagawa, 12 February: 20.6 µg/m³ Yanagawa, 13 February: 15.3 µg/m³ Yanagawa, 14 February: 19.5 µg/m³ Yanagawa, 15 February: 10.7 µg/m³ Shintomi Shintomi, 8 February: 9.8 µg/m³ Shintomi, 9 February: 7.6 µg/m³ Shintomi, 10 February: 8.2 µg/m³ Shintomi, 11 February: 30.8 µg/m³, 4.0× its usual 7.7 Shintomi, 12 February: 20.1 µg/m³ Shintomi, 13 February: 14.2 µg/m³ Shintomi, 14 February: 12.5 µg/m³ Shintomi, 15 February: 7.0 µg/m³ Amami Amami, 8 February: 7.7 µg/m³ Amami, 9 February: 8.1 µg/m³ Amami, 10 February: 10.0 µg/m³ Amami, 11 February: 30.8 µg/m³, 4.0× its usual 7.7 Amami, 12 February: 19.1 µg/m³ Amami, 13 February: 11.4 µg/m³ Amami, 14 February: 7.2 µg/m³ Amami, 15 February: 8.8 µg/m³ Nobeoka Nobeoka, 8 February: 6.7 µg/m³ Nobeoka, 9 February: 8.9 µg/m³ Nobeoka, 10 February: 10.6 µg/m³ Nobeoka, 11 February: 30.6 µg/m³, 3.7× its usual 8.2 Nobeoka, 12 February: 23.3 µg/m³ Nobeoka, 13 February: 18.4 µg/m³ Nobeoka, 14 February: 16.9 µg/m³ Nobeoka, 15 February: 10.7 µg/m³ Nichinan Nichinan, 8 February: 12.5 µg/m³ Nichinan, 9 February: 7.8 µg/m³ Nichinan, 10 February: 10.8 µg/m³ Nichinan, 11 February: 30.5 µg/m³, 3.6× its usual 8.5 Nichinan, 12 February: 20.5 µg/m³ Nichinan, 13 February: 14.5 µg/m³ Nichinan, 14 February: no reading Nichinan, 15 February: no reading Ogōri Ogōri, 8 February: 6.9 µg/m³ Ogōri, 9 February: 9.3 µg/m³ Ogōri, 10 February: 12.0 µg/m³ Ogōri, 11 February: 30.4 µg/m³, 3.3× its usual 9.1 Ogōri, 12 February: 23.4 µg/m³ Ogōri, 13 February: 17.5 µg/m³ Ogōri, 14 February: 15.7 µg/m³ Ogōri, 15 February: 13.2 µg/m³ Sendai Sendai, 8 February: 8.0 µg/m³ Sendai, 9 February: 7.2 µg/m³ Sendai, 10 February: 13.4 µg/m³ Sendai, 11 February: 30.1 µg/m³, 3.2× its usual 9.3 Sendai, 12 February: 18.2 µg/m³ Sendai, 13 February: 17.4 µg/m³ Sendai, 14 February: 13.1 µg/m³ Sendai, 15 February: 7.8 µg/m³ 8 Feb 9 10 11 12 13 14 15 The 60 cities with the highest readings of 85, 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
Iki Nagasaki, Japan 1 11 February 5.5 7.2× Saikai Nagasaki, Japan 1 11 February 6.0 6.9× Tsushima Nagasaki, Japan 1 11 February 7.1 6.4× Gotō Nagasaki, Japan 1 11 February 6.8 6.2× Obita Nagasaki, Japan 1 11 February 6.3 6.0× Matsuura Nagasaki, Japan 1 11 February 7.0 5.8× Ōmura Nagasaki, Japan 1 11 February 7.3 5.7× Karatsu Saga, Japan 1 11 February 7.3 5.3× Ureshinomachi-shimojuku Saga, Japan 1 11 February 7.9 5.1× Nagasaki Nagasaki, Japan 1 11 February 8.1 5.0× Itoshima Fukuoka, Japan 1 11 February 8.1 5.0× Isahaya Nagasaki, Japan 1 11 February 7.1 5.0× Togitsu Nagasaki, Japan 1 11 February 8.3 4.8× Wakasugi Fukuoka, Japan 1 11 February 7.3 4.8× Munakata Fukuoka, Japan 1 11 February 7.5 4.7× Sasebo Nagasaki, Japan 1 11 February 9.1 4.6× Kushikino Kagoshima, Japan 1 11 February 7.8 4.6× Buzen Fukuoka, Japan 1 11 February 7.2 4.6× Maebaru-chūō Fukuoka, Japan 2 11 February 10.4 4.5× Imarichō-kō Saga, Japan 1 11 February 8.7 4.5× Kashima Saga, Japan 1 11 February 8.6 4.5× Takeo Saga, Japan 1 11 February 8.3 4.5× Koga Fukuoka, Japan 1 11 February 8.1 4.5× Kobayashi Miyazaki, Japan 1 11 February 7.0 4.5× Kurume Fukuoka, Japan 1 11 February 7.7 4.4× Nakama Fukuoka, Japan 1 11 February 7.3 4.4× Tsurusaki Oita, Japan 2 11 February 8.1 4.3× Izumi Kagoshima, Japan 1 11 February 8.1 4.2× Kagoshima Kagoshima, Japan 1 11 February 8.7 4.1× Kitakyushu Fukuoka, Japan 1 11 February 8.6 4.1× Miyazaki Miyazaki, Japan 1 11 February 8.0 4.1× Yame Fukuoka, Japan 1 11 February 7.9 4.1× Higashigō Saga, Japan 2 11 February 9.3 4.0× Fukuoka Fukuoka, Japan 1 11 February 9.3 4.0× Iizuka Fukuoka, Japan 1 11 February 8.6 4.0× Yukuhashi Fukuoka, Japan 2 11 February 8.1 4.0× Shintomi Miyazaki, Japan 1 11 February 7.7 4.0× Amami Kagoshima, Japan 1 11 February 7.7 4.0× Minamikyushu Kagoshima, Japan 1 11 February 7.5 4.0× Marugame Kagawa, Japan 1 11 February 7.2 4.0× Zentsujichó Kagawa, Japan 1 11 February 6.6 4.0× Tanushimarumachi-toyoki Fukuoka, Japan 2 11 February 10.8 3.9× Koga Fukuoka, Japan 2 11 February 8.7 3.9× Shimonoseki Yamaguchi, Japan 1 11 February 8.5 3.9× Ukiha Fukuoka, Japan 2 11 February 8.4 3.9× Narutochō-mitsuishi Tokushima, Japan 1 11 February 7.0 3.9× Chikugo Fukuoka, Japan 2 11 February 9.5 3.8× Nakatsu Oita, Japan 2 11 February 9.1 3.8× Taku Saga, Japan 1 11 February 8.5 3.8× Nagato Yamaguchi, Japan 1 11 February 8.5 3.8× Kasuga Fukuoka, Japan 1 11 February 8.3 3.8× Kaseda-shirakame Kagoshima, Japan 1 11 February 7.7 3.8× Ōita Oita, Japan 1 11 February 7.4 3.8× Yanagawa Fukuoka, Japan 1 11 February 8.3 3.7× Nobeoka Miyazaki, Japan 1 11 February 8.2 3.7× Tosu Saga, Japan 1 11 February 9.0 3.6× Saga Saga, Japan 1 11 February 8.9 3.6× Kanzakimachi-kanzaki Saga, Japan 1 11 February 8.9 3.6× Nichinan Miyazaki, Japan 1 11 February 8.5 3.6× Kanda Fukuoka, Japan 1 11 February 8.1 3.6× Tagawa Fukuoka, Japan 1 11 February 9.1 3.5× Nōgata Fukuoka, Japan 2 11 February 9.0 3.5× Kasaoka Okayama, Japan 1 11 February 8.1 3.5× Ōmuta Fukuoka, Japan 1 11 February 10.8 3.4× Ube Yamaguchi, Japan 1 11 February 7.9 3.4× Arida Wakayama, Japan 1 11 February 7.7 3.4× Kure Hiroshima, Japan 1 11 February 7.7 3.4× Shūnan Yamaguchi, Japan 1 11 February 7.7 3.4× Miyakonojō Miyazaki, Japan 1 11 February 11.2 3.3× Takanabe Miyazaki, Japan 1 11 February 9.5 3.3× Ogōri Fukuoka, Japan 1 11 February 9.1 3.3× Sendai Kagoshima, Japan 1 11 February 9.3 3.2× Saiki Oita, Japan 1 11 February 8.5 3.2× Shikokuchūō Ehime, Japan 1 11 February 9.4 3.1× Kan’onjichō Kagawa, Japan 1 11 February 9.1 3.1× Iyo Ehime, Japan 1 11 February 8.7 3.1× Niihama Ehime, Japan 1 11 February 9.3 3.0× Hikari Yamaguchi, Japan 1 11 February 9.3 2.9× Matsuyama Ehime, Japan 1 11 February 9.1 2.9× Fukuyama Hiroshima, Japan 1 11 February 9.4 2.8× Onoda Yamaguchi, Japan 1 11 February 10.0 2.7× Tamano Okayama, Japan 1 11 February 10.0 2.7× Hyūga Miyazaki, Japan 1 11 February 9.3 2.7× Shido Kagawa, Japan 1 11 February 9.6 2.6× Beppu Oita, Japan 1 11 February 9.6 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 14 of 39 episodes in Japan since our records began, by cities reached.
Japan and South Korea, 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, 21 to 25 July 2026 172 Japan, November 2023 131 Japan, 4 to 5 August 2025 126 Japan, January and February 2025 110 Japan, May 2025 103 Japan, March 2025 92 Japan, 11 to 12 February 2024 85 Bars: cities reached; colour: the level of the episode's highest daily reading. All 39 .
Use this page SmogRank, Japan, 11 to 12 February 2024: 85 cities with PM2.5 at twice their usual or more, 11 to 12 February 2024, smogrank.com/episodes/2024-02-11-japan (accessed 4 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.
