SmogRank / Episodes / Japan
Japan, 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 Onoda Tamano Fukuyama Matsuyama Hikari Niihama Shikokuchūō Iyo Kan’onjichō Saiki Sendai Ogōri Miyakonojō Takanabe Shūnan Arida Kure Ōmuta Ube Kasaoka Nōgata Tagawa Kanda Kanzakimachi-kanzaki Nichinan Saga Tosu Nobeoka Yanagawa Chikugo Taku Kasuga Nagato Kaseda-shirakame Nakatsu Ōita Ukiha Koga Narutochō-mitsuishi Shimonoseki Tanushimarumachi-toyoki Minamikyushu Higashigō Amami Shintomi Fukuoka Iizuka Marugame Yukuhashi Zentsujichó Yame Kagoshima Kitakyushu Miyazaki Izumi Tsurusaki Kurume Nakama Imarichō-kō Kashima Kobayashi Koga Maebaru-chūō Takeo Buzen Kushikino Sasebo Munakata Wakasugi Togitsu Itoshima Isahaya 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
Kasaoka Kasaoka, 8 February: 8.5 µg/m³, 1.0× usual Kasaoka, 9 February: 9.4 µg/m³, 1.2× usual Kasaoka, 10 February: 11.3 µg/m³, 1.4× usual Kasaoka, 11 February: 28.3 µg/m³, 3.5× usual Kasaoka, 12 February: 19.6 µg/m³, 2.4× usual Kasaoka, 13 February: 21.9 µg/m³, 2.7× usual Kasaoka, 14 February: 46.9 µg/m³, 5.8× usual Kasaoka, 15 February: 31.4 µg/m³, 3.9× usual Maebaru-chūō Maebaru-chūō, 8 February: 6.3 µg/m³, 0.6× usual Maebaru-chūō, 9 February: 10.9 µg/m³, 1.0× usual Maebaru-chūō, 10 February: 14.6 µg/m³, 1.4× usual Maebaru-chūō, 11 February: 46.5 µg/m³, 4.5× usual Maebaru-chūō, 12 February: 26.9 µg/m³, 2.6× usual Maebaru-chūō, 13 February: 21.3 µg/m³, 2.0× usual Maebaru-chūō, 14 February: 15.0 µg/m³, 1.4× usual Maebaru-chūō, 15 February: 11.3 µg/m³, 1.1× usual Tsushima Tsushima, 8 February: 4.1 µg/m³, 0.6× usual Tsushima, 9 February: 10.6 µg/m³, 1.5× usual Tsushima, 10 February: 13.6 µg/m³, 1.9× usual Tsushima, 11 February: 45.5 µg/m³, 6.4× usual Tsushima, 12 February: 23.0 µg/m³, 3.2× usual Tsushima, 13 February: 12.9 µg/m³, 1.8× usual Tsushima, 14 February: 10.0 µg/m³, 1.4× usual Tsushima, 15 February: 6.0 µg/m³, 0.8× usual Niihama Niihama, 8 February: 5.4 µg/m³, 0.6× usual Niihama, 9 February: no reading Niihama, 10 February: 14.5 µg/m³, 1.6× usual Niihama, 11 February: 28.0 µg/m³, 3.0× usual Niihama, 12 February: 22.0 µg/m³, 2.4× usual Niihama, 13 February: 20.3 µg/m³, 2.2× usual Niihama, 14 February: 34.8 µg/m³, 3.7× usual Niihama, 15 February: 43.6 µg/m³, 4.7× usual Shikokuchūō Shikokuchūō, 8 February: 9.0 µg/m³, 1.0× usual Shikokuchūō, 9 February: 11.1 µg/m³, 1.2× usual Shikokuchūō, 10 February: 15.0 µg/m³, 1.6× usual Shikokuchūō, 11 February: 29.1 µg/m³, 3.1× usual Shikokuchūō, 12 February: 21.5 µg/m³, 2.3× usual Shikokuchūō, 13 February: 25.3 µg/m³, 2.7× usual Shikokuchūō, 14 February: 36.4 µg/m³, 3.9× usual Shikokuchūō, 15 February: 43.5 µg/m³, 4.6× usual Sasebo Sasebo, 8 February: 5.4 µg/m³, 0.6× usual Sasebo, 9 February: 7.6 µg/m³, 0.8× usual Sasebo, 10 February: 14.1 µg/m³, 1.5× usual Sasebo, 11 February: 42.3 µg/m³, 4.6× usual Sasebo, 12 February: 20.9 µg/m³, 2.3× usual Sasebo, 13 February: 16.1 µg/m³, 1.8× usual Sasebo, 14 February: 14.4 µg/m³, 1.6× usual Sasebo, 15 February: 9.4 µg/m³, 1.0× usual Gotō Gotō, 8 February: 7.5 µg/m³, 1.1× usual Gotō, 9 February: 6.8 µg/m³, 1.0× usual Gotō, 10 February: 21.3 µg/m³, 3.1× usual Gotō, 11 February: 41.9 µg/m³, 6.2× usual Gotō, 12 February: 24.2 µg/m³, 3.6× usual Gotō, 13 February: 12.0 µg/m³, 1.8× usual Gotō, 14 February: 9.0 µg/m³, 1.3× usual Gotō, 15 February: 6.5 µg/m³, 1.0× usual Ōmura Ōmura, 8 February: 4.1 µg/m³, 0.6× usual Ōmura, 9 February: 6.6 µg/m³, 0.9× usual Ōmura, 10 February: 13.1 µg/m³, 1.8× usual Ōmura, 11 February: 41.9 µg/m³, 5.7× usual Ōmura, 12 February: 19.3 µg/m³, 2.6× usual Ōmura, 13 February: 15.0 µg/m³, 2.1× usual Ōmura, 14 February: 14.3 µg/m³, 2.0× usual Ōmura, 15 February: 8.1 µg/m³, 1.1× usual Tanushimarumachi-to… Tanushimarumachi-toyoki, 8 February: 8.6 µg/m³, 0.8× usual Tanushimarumachi-toyoki, 9 February: 9.6 µg/m³, 0.9× usual Tanushimarumachi-toyoki, 10 February: 17.0 µg/m³, 1.6× usual Tanushimarumachi-toyoki, 11 February: 41.8 µg/m³, 3.9× usual Tanushimarumachi-toyoki, 12 February: 27.8 µg/m³, 2.6× usual Tanushimarumachi-toyoki, 13 February: 19.5 µg/m³, 1.8× usual Tanushimarumachi-toyoki, 14 February: 21.1 µg/m³, 2.0× usual Tanushimarumachi-toyoki, 15 February: 16.5 µg/m³, 1.5× usual Saikai Saikai, 8 February: 3.0 µg/m³, 0.5× usual Saikai, 9 February: 5.6 µg/m³, 0.9× usual Saikai, 10 February: 11.9 µg/m³, 2.0× usual Saikai, 11 February: 41.2 µg/m³, 6.9× usual Saikai, 12 February: 18.6 µg/m³, 3.1× usual Saikai, 13 February: 11.0 µg/m³, 1.8× usual Saikai, 14 February: 10.3 µg/m³, 1.7× usual Saikai, 15 February: 6.2 µg/m³, 1.0× usual Matsuura Matsuura, 8 February: 3.9 µg/m³, 0.6× usual Matsuura, 9 February: 7.3 µg/m³, 1.0× usual Matsuura, 10 February: 12.3 µg/m³, 1.8× usual Matsuura, 11 February: 40.8 µg/m³, 5.8× usual Matsuura, 12 February: 19.9 µg/m³, 2.8× usual Matsuura, 13 February: 13.7 µg/m³, 2.0× usual Matsuura, 14 February: 11.2 µg/m³, 1.6× usual Matsuura, 15 February: 7.3 µg/m³, 1.0× usual Fukuyama Fukuyama, 8 February: no reading Fukuyama, 9 February: 8.2 µg/m³, 0.9× usual Fukuyama, 10 February: 10.6 µg/m³, 1.1× usual Fukuyama, 11 February: 26.0 µg/m³, 2.8× usual Fukuyama, 12 February: 17.1 µg/m³, 1.8× usual Fukuyama, 13 February: 24.1 µg/m³, 2.6× usual Fukuyama, 14 February: 40.6 µg/m³, 4.3× usual Fukuyama, 15 February: 32.6 µg/m³, 3.5× usual Ureshinomachi-shimo… Ureshinomachi-shimojuku, 8 February: 5.3 µg/m³, 0.7× usual Ureshinomachi-shimojuku, 9 February: 7.3 µg/m³, 0.9× usual Ureshinomachi-shimojuku, 10 February: 14.2 µg/m³, 1.8× usual Ureshinomachi-shimojuku, 11 February: 40.5 µg/m³, 5.1× usual Ureshinomachi-shimojuku, 12 February: 19.0 µg/m³, 2.4× usual Ureshinomachi-shimojuku, 13 February: 15.1 µg/m³, 1.9× usual Ureshinomachi-shimojuku, 14 February: 16.6 µg/m³, 2.1× usual Ureshinomachi-shimojuku, 15 February: 13.5 µg/m³, 1.7× usual Nagasaki Nagasaki, 8 February: 4.5 µg/m³, 0.6× usual Nagasaki, 9 February: 5.9 µg/m³, 0.7× usual Nagasaki, 10 February: 13.5 µg/m³, 1.7× usual Nagasaki, 11 February: 40.1 µg/m³, 5.0× usual Nagasaki, 12 February: 17.6 µg/m³, 2.2× usual Nagasaki, 13 February: 14.2 µg/m³, 1.8× usual Nagasaki, 14 February: 13.9 µg/m³, 1.7× usual Nagasaki, 15 February: 7.1 µg/m³, 0.9× usual Itoshima Itoshima, 8 February: 5.0 µg/m³, 0.6× usual Itoshima, 9 February: 9.1 µg/m³, 1.1× usual Itoshima, 10 February: 12.3 µg/m³, 1.5× usual Itoshima, 11 February: 40.1 µg/m³, 5.0× usual Itoshima, 12 February: 24.1 µg/m³, 3.0× usual Itoshima, 13 February: 15.8 µg/m³, 2.0× usual Itoshima, 14 February: 12.8 µg/m³, 1.6× usual Itoshima, 15 February: 8.6 µg/m³, 1.1× usual Togitsu Togitsu, 8 February: 5.6 µg/m³, 0.7× usual Togitsu, 9 February: 7.5 µg/m³, 0.9× usual Togitsu, 10 February: 15.3 µg/m³, 1.8× usual Togitsu, 11 February: 40.1 µg/m³, 4.8× usual Togitsu, 12 February: 21.6 µg/m³, 2.6× usual Togitsu, 13 February: 16.7 µg/m³, 2.0× usual Togitsu, 14 February: 15.4 µg/m³, 1.9× usual Togitsu, 15 February: 9.6 µg/m³, 1.2× usual Iki Iki, 8 February: 2.1 µg/m³, 0.4× usual Iki, 9 February: 5.9 µg/m³, 1.1× usual Iki, 10 February: 12.1 µg/m³, 2.2× usual Iki, 11 February: 39.8 µg/m³, 7.2× usual Iki, 12 February: 18.1 µg/m³, 3.3× usual Iki, 13 February: 11.8 µg/m³, 2.1× usual Iki, 14 February: 10.0 µg/m³, 1.8× usual Iki, 15 February: 6.0 µg/m³, 1.1× usual Imarichō-kō Imarichō-kō, 8 February: 7.3 µg/m³, 0.8× usual Imarichō-kō, 9 February: 9.6 µg/m³, 1.1× usual Imarichō-kō, 10 February: 14.4 µg/m³, 1.7× usual Imarichō-kō, 11 February: 39.3 µg/m³, 4.5× usual Imarichō-kō, 12 February: 22.5 µg/m³, 2.6× usual Imarichō-kō, 13 February: 18.7 µg/m³, 2.1× usual Imarichō-kō, 14 February: 17.8 µg/m³, 2.0× usual Imarichō-kō, 15 February: 12.3 µg/m³, 1.4× usual Kashima Kashima, 8 February: 6.4 µg/m³, 0.7× usual Kashima, 9 February: 7.4 µg/m³, 0.9× usual Kashima, 10 February: 14.0 µg/m³, 1.6× usual Kashima, 11 February: 39.0 µg/m³, 4.5× usual Kashima, 12 February: 20.9 µg/m³, 2.4× usual Kashima, 13 February: 17.9 µg/m³, 2.1× usual Kashima, 14 February: 18.7 µg/m³, 2.2× usual Kashima, 15 February: 15.0 µg/m³, 1.7× usual Karatsu Karatsu, 8 February: 5.3 µg/m³, 0.7× usual Karatsu, 9 February: 8.1 µg/m³, 1.1× usual Karatsu, 10 February: 13.2 µg/m³, 1.8× usual Karatsu, 11 February: 38.8 µg/m³, 5.3× usual Karatsu, 12 February: 19.8 µg/m³, 2.7× usual Karatsu, 13 February: 15.0 µg/m³, 2.1× usual Karatsu, 14 February: 13.6 µg/m³, 1.9× usual Karatsu, 15 February: 9.6 µg/m³, 1.3× usual Higashigō Higashigō, 8 February: 9.0 µg/m³, 1.0× usual Higashigō, 9 February: 11.3 µg/m³, 1.2× usual Higashigō, 10 February: 14.1 µg/m³, 1.5× usual Higashigō, 11 February: 37.6 µg/m³, 4.0× usual Higashigō, 12 February: 25.0 µg/m³, 2.7× usual Higashigō, 13 February: 27.2 µg/m³, 2.9× usual Higashigō, 14 February: 21.0 µg/m³, 2.3× usual Higashigō, 15 February: 13.5 µg/m³, 1.5× usual Obita Obita, 8 February: 4.7 µg/m³, 0.7× usual Obita, 9 February: 5.3 µg/m³, 0.8× usual Obita, 10 February: 13.5 µg/m³, 2.1× usual Obita, 11 February: 37.5 µg/m³, 6.0× usual Obita, 12 February: 17.5 µg/m³, 2.8× usual Obita, 13 February: 13.0 µg/m³, 2.1× usual Obita, 14 February: 14.0 µg/m³, 2.2× usual Obita, 15 February: 8.8 µg/m³, 1.4× usual Takeo Takeo, 8 February: 6.5 µg/m³, 0.8× usual Takeo, 9 February: 7.5 µg/m³, 0.9× usual Takeo, 10 February: 12.2 µg/m³, 1.5× usual Takeo, 11 February: 37.0 µg/m³, 4.5× usual Takeo, 12 February: 20.5 µg/m³, 2.5× usual Takeo, 13 February: 18.2 µg/m³, 2.2× usual Takeo, 14 February: 18.8 µg/m³, 2.3× usual Takeo, 15 February: 13.8 µg/m³, 1.7× usual Fukuoka Fukuoka, 8 February: 5.6 µg/m³, 0.6× usual Fukuoka, 9 February: 8.9 µg/m³, 1.0× usual Fukuoka, 10 February: 12.5 µg/m³, 1.3× usual Fukuoka, 11 February: 36.9 µg/m³, 4.0× usual Fukuoka, 12 February: 24.0 µg/m³, 2.6× usual Fukuoka, 13 February: 18.1 µg/m³, 1.9× usual Fukuoka, 14 February: 14.4 µg/m³, 1.5× usual Fukuoka, 15 February: 11.0 µg/m³, 1.2× usual Miyakonojō Miyakonojō, 8 February: 14.7 µg/m³, 1.3× usual Miyakonojō, 9 February: 11.2 µg/m³, 1.0× usual Miyakonojō, 10 February: 14.6 µg/m³, 1.3× usual Miyakonojō, 11 February: 36.8 µg/m³, 3.3× usual Miyakonojō, 12 February: 23.1 µg/m³, 2.1× usual Miyakonojō, 13 February: 20.8 µg/m³, 1.9× usual Miyakonojō, 14 February: 16.6 µg/m³, 1.5× usual Miyakonojō, 15 February: 12.4 µg/m³, 1.1× usual Koga Koga, 8 February: 6.0 µg/m³, 0.7× usual Koga, 9 February: 9.1 µg/m³, 1.1× usual Koga, 10 February: 10.2 µg/m³, 1.3× usual Koga, 11 February: 36.7 µg/m³, 4.5× usual Koga, 12 February: 24.3 µg/m³, 3.0× usual Koga, 13 February: 14.1 µg/m³, 1.7× usual Koga, 14 February: 12.0 µg/m³, 1.5× usual Koga, 15 February: 6.9 µg/m³, 0.9× usual Ōmuta Ōmuta, 8 February: 9.2 µg/m³, 0.9× usual Ōmuta, 9 February: 8.7 µg/m³, 0.8× usual Ōmuta, 10 February: 16.4 µg/m³, 1.5× usual Ōmuta, 11 February: 36.4 µg/m³, 3.4× usual Ōmuta, 12 February: 24.4 µg/m³, 2.3× usual Ōmuta, 13 February: 20.0 µg/m³, 1.9× usual Ōmuta, 14 February: 21.8 µg/m³, 2.0× usual Ōmuta, 15 February: 16.8 µg/m³, 1.6× usual Chikugo Chikugo, 8 February: 9.0 µg/m³, 0.9× usual Chikugo, 9 February: 10.7 µg/m³, 1.1× usual Chikugo, 10 February: 15.4 µg/m³, 1.6× usual Chikugo, 11 February: 36.2 µg/m³, 3.8× usual Chikugo, 12 February: 27.4 µg/m³, 2.9× usual Chikugo, 13 February: 20.4 µg/m³, 2.1× usual Chikugo, 14 February: 22.0 µg/m³, 2.3× usual Chikugo, 15 February: 14.0 µg/m³, 1.5× usual Kushikino Kushikino, 8 February: 6.7 µg/m³, 0.9× usual Kushikino, 9 February: 5.1 µg/m³, 0.7× usual Kushikino, 10 February: 14.0 µg/m³, 1.8× usual Kushikino, 11 February: 35.8 µg/m³, 4.6× usual Kushikino, 12 February: 16.5 µg/m³, 2.1× usual Kushikino, 13 February: 15.1 µg/m³, 1.9× usual Kushikino, 14 February: 8.3 µg/m³, 1.1× usual Kushikino, 15 February: 7.5 µg/m³, 1.0× usual Isahaya Isahaya, 8 February: no reading Isahaya, 9 February: 4.3 µg/m³, 0.6× usual Isahaya, 10 February: 12.6 µg/m³, 1.8× usual Isahaya, 11 February: 35.5 µg/m³, 5.0× usual Isahaya, 12 February: 19.3 µg/m³, 2.7× usual Isahaya, 13 February: 15.4 µg/m³, 2.2× usual Isahaya, 14 February: 14.9 µg/m³, 2.1× usual Isahaya, 15 February: 11.6 µg/m³, 1.6× usual Kagoshima Kagoshima, 8 February: 8.0 µg/m³, 0.9× usual Kagoshima, 9 February: 6.1 µg/m³, 0.7× usual Kagoshima, 10 February: 12.5 µg/m³, 1.4× usual Kagoshima, 11 February: 35.3 µg/m³, 4.1× usual Kagoshima, 12 February: 19.1 µg/m³, 2.2× usual Kagoshima, 13 February: 17.7 µg/m³, 2.0× usual Kagoshima, 14 February: 13.5 µg/m³, 1.6× usual Kagoshima, 15 February: 8.4 µg/m³, 1.0× usual Munakata Munakata, 8 February: 5.7 µg/m³, 0.8× usual Munakata, 9 February: 8.5 µg/m³, 1.1× usual Munakata, 10 February: 9.5 µg/m³, 1.3× usual Munakata, 11 February: 35.2 µg/m³, 4.7× usual Munakata, 12 February: 23.6 µg/m³, 3.1× usual Munakata, 13 February: 14.8 µg/m³, 2.0× usual Munakata, 14 February: 11.4 µg/m³, 1.5× usual Munakata, 15 February: 7.1 µg/m³, 0.9× usual Kitakyushu Kitakyushu, 8 February: 7.1 µg/m³, 0.8× usual Kitakyushu, 9 February: 9.5 µg/m³, 1.1× usual Kitakyushu, 10 February: 9.2 µg/m³, 1.1× usual Kitakyushu, 11 February: 35.0 µg/m³, 4.1× usual Kitakyushu, 12 February: 24.0 µg/m³, 2.8× usual Kitakyushu, 13 February: 19.0 µg/m³, 2.2× usual Kitakyushu, 14 February: 17.7 µg/m³, 2.1× usual Kitakyushu, 15 February: 13.6 µg/m³, 1.6× usual Wakasugi Wakasugi, 8 February: 2.8 µg/m³, 0.4× usual Wakasugi, 9 February: 7.3 µg/m³, 1.0× usual Wakasugi, 10 February: 8.9 µg/m³, 1.2× usual Wakasugi, 11 February: 34.8 µg/m³, 4.8× usual Wakasugi, 12 February: 21.8 µg/m³, 3.0× usual Wakasugi, 13 February: 12.9 µg/m³, 1.8× usual Wakasugi, 14 February: 12.3 µg/m³, 1.7× usual Wakasugi, 15 February: 6.9 µg/m³, 0.9× usual Kan’onjichō Kan’onjichō, 8 February: 5.0 µg/m³, 0.5× usual Kan’onjichō, 9 February: 10.0 µg/m³, 1.1× usual Kan’onjichō, 10 February: 11.6 µg/m³, 1.3× usual Kan’onjichō, 11 February: 28.6 µg/m³, 3.1× usual Kan’onjichō, 12 February: 16.6 µg/m³, 1.8× usual Kan’onjichō, 13 February: 21.2 µg/m³, 2.3× usual Kan’onjichō, 14 February: 33.6 µg/m³, 3.7× usual Kan’onjichō, 15 February: 34.7 µg/m³, 3.8× usual Tsurusaki Tsurusaki, 8 February: 7.9 µg/m³, 1.0× usual Tsurusaki, 9 February: 5.7 µg/m³, 0.7× usual Tsurusaki, 10 February: 10.0 µg/m³, 1.2× usual Tsurusaki, 11 February: 34.5 µg/m³, 4.3× usual Tsurusaki, 12 February: 25.6 µg/m³, 3.2× usual Tsurusaki, 13 February: 22.8 µg/m³, 2.8× usual Tsurusaki, 14 February: 19.2 µg/m³, 2.4× usual Tsurusaki, 15 February: 13.8 µg/m³, 1.7× usual Iizuka Iizuka, 8 February: 5.6 µg/m³, 0.7× usual Iizuka, 9 February: 8.1 µg/m³, 0.9× usual Iizuka, 10 February: 9.9 µg/m³, 1.2× usual Iizuka, 11 February: 34.5 µg/m³, 4.0× usual Iizuka, 12 February: 23.3 µg/m³, 2.7× usual Iizuka, 13 February: 17.1 µg/m³, 2.0× usual Iizuka, 14 February: 14.7 µg/m³, 1.7× usual Iizuka, 15 February: 9.3 µg/m³, 1.1× usual Izumi Izumi, 8 February: 7.6 µg/m³, 0.9× usual Izumi, 9 February: 6.2 µg/m³, 0.8× usual Izumi, 10 February: 12.8 µg/m³, 1.6× usual Izumi, 11 February: 34.4 µg/m³, 4.2× usual Izumi, 12 February: 16.6 µg/m³, 2.0× usual Izumi, 13 February: 15.2 µg/m³, 1.9× usual Izumi, 14 February: 10.6 µg/m³, 1.3× usual Izumi, 15 February: 7.2 µg/m³, 0.9× usual Nakatsu Nakatsu, 8 February: 6.7 µg/m³, 0.7× usual Nakatsu, 9 February: 7.0 µg/m³, 0.8× usual Nakatsu, 10 February: 11.7 µg/m³, 1.3× usual Nakatsu, 11 February: 34.2 µg/m³, 3.8× usual Nakatsu, 12 February: 26.5 µg/m³, 2.9× usual Nakatsu, 13 February: 20.6 µg/m³, 2.3× usual Nakatsu, 14 February: 18.5 µg/m³, 2.0× usual Nakatsu, 15 February: 20.1 µg/m³, 2.2× usual Koga Koga, 8 February: 8.3 µg/m³, 1.0× usual Koga, 9 February: 10.0 µg/m³, 1.1× usual Koga, 10 February: 10.6 µg/m³, 1.2× usual Koga, 11 February: 33.9 µg/m³, 3.9× usual Koga, 12 February: 25.4 µg/m³, 2.9× usual Koga, 13 February: 18.6 µg/m³, 2.1× usual Koga, 14 February: 16.2 µg/m³, 1.9× usual Koga, 15 February: 10.7 µg/m³, 1.2× usual Kurume Kurume, 8 February: 7.3 µg/m³, 0.9× usual Kurume, 9 February: 8.4 µg/m³, 1.1× usual Kurume, 10 February: 12.0 µg/m³, 1.6× usual Kurume, 11 February: 33.6 µg/m³, 4.4× usual Kurume, 12 February: 22.8 µg/m³, 3.0× usual Kurume, 13 February: 18.2 µg/m³, 2.4× usual Kurume, 14 February: 18.0 µg/m³, 2.3× usual Kurume, 15 February: 13.8 µg/m³, 1.8× usual Buzen Buzen, 8 February: 3.6 µg/m³, 0.5× usual Buzen, 9 February: 4.6 µg/m³, 0.6× usual Buzen, 10 February: 8.8 µg/m³, 1.2× usual Buzen, 11 February: 33.0 µg/m³, 4.6× usual Buzen, 12 February: 24.1 µg/m³, 3.3× usual Buzen, 13 February: 17.1 µg/m³, 2.4× usual Buzen, 14 February: 14.8 µg/m³, 2.1× usual Buzen, 15 February: 14.2 µg/m³, 2.0× usual Shimonoseki Shimonoseki, 8 February: 3.2 µg/m³, 0.4× usual Shimonoseki, 9 February: 7.8 µg/m³, 0.9× usual Shimonoseki, 10 February: 10.8 µg/m³, 1.3× usual Shimonoseki, 11 February: 32.8 µg/m³, 3.9× usual Shimonoseki, 12 February: 21.9 µg/m³, 2.6× usual Shimonoseki, 13 February: 23.0 µg/m³, 2.7× usual Shimonoseki, 14 February: 21.0 µg/m³, 2.5× usual Shimonoseki, 15 February: 15.5 µg/m³, 1.8× usual Ukiha Ukiha, 8 February: 6.6 µg/m³, 0.8× usual Ukiha, 9 February: 8.6 µg/m³, 1.0× usual Ukiha, 10 February: 12.0 µg/m³, 1.4× usual Ukiha, 11 February: 32.7 µg/m³, 3.9× usual Ukiha, 12 February: 25.4 µg/m³, 3.0× usual Ukiha, 13 February: 17.7 µg/m³, 2.1× usual Ukiha, 14 February: 16.1 µg/m³, 1.9× usual Ukiha, 15 February: 14.0 µg/m³, 1.7× usual Miyazaki Miyazaki, 8 February: 11.1 µg/m³, 1.4× usual Miyazaki, 9 February: 8.3 µg/m³, 1.0× usual Miyazaki, 10 February: 9.7 µg/m³, 1.2× usual Miyazaki, 11 February: 32.6 µg/m³, 4.1× usual Miyazaki, 12 February: 21.1 µg/m³, 2.6× usual Miyazaki, 13 February: 17.9 µg/m³, 2.2× usual Miyazaki, 14 February: 13.8 µg/m³, 1.7× usual Miyazaki, 15 February: 8.8 µg/m³, 1.1× usual Tosu Tosu, 8 February: 7.8 µg/m³, 0.9× usual Tosu, 9 February: 8.5 µg/m³, 0.9× usual Tosu, 10 February: 13.5 µg/m³, 1.5× usual Tosu, 11 February: 32.6 µg/m³, 3.6× usual Tosu, 12 February: 22.2 µg/m³, 2.5× usual Tosu, 13 February: 18.6 µg/m³, 2.1× usual Tosu, 14 February: 15.7 µg/m³, 1.7× usual Tosu, 15 February: 14.1 µg/m³, 1.6× usual Yukuhashi Yukuhashi, 8 February: 4.7 µg/m³, 0.6× usual Yukuhashi, 9 February: 8.3 µg/m³, 1.0× usual Yukuhashi, 10 February: 8.6 µg/m³, 1.1× usual Yukuhashi, 11 February: 32.5 µg/m³, 4.0× usual Yukuhashi, 12 February: 26.9 µg/m³, 3.3× usual Yukuhashi, 13 February: 21.1 µg/m³, 2.6× usual Yukuhashi, 14 February: 21.7 µg/m³, 2.7× usual Yukuhashi, 15 February: 18.3 µg/m³, 2.3× usual Taku Taku, 8 February: 7.1 µg/m³, 0.8× usual Taku, 9 February: 9.0 µg/m³, 1.1× usual Taku, 10 February: 12.3 µg/m³, 1.4× usual Taku, 11 February: 32.5 µg/m³, 3.8× usual Taku, 12 February: 21.6 µg/m³, 2.5× usual Taku, 13 February: 19.7 µg/m³, 2.3× usual Taku, 14 February: 15.7 µg/m³, 1.8× usual Taku, 15 February: 11.6 µg/m³, 1.4× usual Yame Yame, 8 February: 5.1 µg/m³, 0.6× usual Yame, 9 February: 5.8 µg/m³, 0.7× usual Yame, 10 February: 12.3 µg/m³, 1.6× usual Yame, 11 February: 32.4 µg/m³, 4.1× usual Yame, 12 February: 21.5 µg/m³, 2.7× usual Yame, 13 February: 14.0 µg/m³, 1.8× usual Yame, 14 February: 16.7 µg/m³, 2.1× usual Yame, 15 February: 9.6 µg/m³, 1.2× usual Nagato Nagato, 8 February: 3.6 µg/m³, 0.4× usual Nagato, 9 February: no reading Nagato, 10 February: 11.0 µg/m³, 1.3× usual Nagato, 11 February: 32.3 µg/m³, 3.8× usual Nagato, 12 February: 22.2 µg/m³, 2.6× usual Nagato, 13 February: 16.9 µg/m³, 2.0× usual Nagato, 14 February: 13.8 µg/m³, 1.6× usual Nagato, 15 February: 8.9 µg/m³, 1.0× usual Saga Saga, 8 February: 8.0 µg/m³, 0.9× usual Saga, 9 February: 7.4 µg/m³, 0.8× usual Saga, 10 February: 13.4 µg/m³, 1.5× usual Saga, 11 February: 32.3 µg/m³, 3.6× usual Saga, 12 February: 22.8 µg/m³, 2.6× usual Saga, 13 February: 17.5 µg/m³, 2.0× usual Saga, 14 February: 17.0 µg/m³, 1.9× usual Saga, 15 February: 11.2 µg/m³, 1.3× usual Tagawa Tagawa, 8 February: 7.2 µg/m³, 0.8× usual Tagawa, 9 February: 9.5 µg/m³, 1.0× usual Tagawa, 10 February: 10.5 µg/m³, 1.2× usual Tagawa, 11 February: 32.2 µg/m³, 3.5× usual Tagawa, 12 February: 23.7 µg/m³, 2.6× usual Tagawa, 13 February: 17.5 µg/m³, 1.9× usual Tagawa, 14 February: 17.7 µg/m³, 1.9× usual Tagawa, 15 February: 11.4 µg/m³, 1.3× usual Nakama Nakama, 8 February: 4.5 µg/m³, 0.6× usual Nakama, 9 February: 8.2 µg/m³, 1.1× usual Nakama, 10 February: 6.5 µg/m³, 0.9× usual Nakama, 11 February: 32.1 µg/m³, 4.4× usual Nakama, 12 February: 22.6 µg/m³, 3.1× usual Nakama, 13 February: 15.6 µg/m³, 2.1× usual Nakama, 14 February: 13.7 µg/m³, 1.9× usual Nakama, 15 February: 7.5 µg/m³, 1.0× usual Kanzakimachi-kanzaki Kanzakimachi-kanzaki, 8 February: 7.6 µg/m³, 0.9× usual Kanzakimachi-kanzaki, 9 February: 8.4 µg/m³, 0.9× usual Kanzakimachi-kanzaki, 10 February: 12.0 µg/m³, 1.3× usual Kanzakimachi-kanzaki, 11 February: 32.0 µg/m³, 3.6× usual Kanzakimachi-kanzaki, 12 February: 22.0 µg/m³, 2.5× usual Kanzakimachi-kanzaki, 13 February: 18.2 µg/m³, 2.0× usual Kanzakimachi-kanzaki, 14 February: 17.0 µg/m³, 1.9× usual Kanzakimachi-kanzaki, 15 February: 11.2 µg/m³, 1.3× usual Nōgata Nōgata, 8 February: 8.2 µg/m³, 0.9× usual Nōgata, 9 February: 10.3 µg/m³, 1.1× usual Nōgata, 10 February: 9.3 µg/m³, 1.0× usual Nōgata, 11 February: 31.8 µg/m³, 3.5× usual Nōgata, 12 February: 25.1 µg/m³, 2.8× usual Nōgata, 13 February: 17.2 µg/m³, 1.9× usual Nōgata, 14 February: 13.8 µg/m³, 1.5× usual Nōgata, 15 February: 11.0 µg/m³, 1.2× usual Kasuga Kasuga, 8 February: 5.9 µg/m³, 0.7× usual Kasuga, 9 February: 8.4 µg/m³, 1.0× usual Kasuga, 10 February: 10.5 µg/m³, 1.3× usual Kasuga, 11 February: 31.7 µg/m³, 3.8× usual Kasuga, 12 February: 22.7 µg/m³, 2.7× usual Kasuga, 13 February: 17.3 µg/m³, 2.1× usual Kasuga, 14 February: 15.3 µg/m³, 1.8× usual Kasuga, 15 February: 11.0 µg/m³, 1.3× usual Kobayashi Kobayashi, 8 February: 8.6 µg/m³, 1.2× usual Kobayashi, 9 February: 6.1 µg/m³, 0.9× usual Kobayashi, 10 February: 11.0 µg/m³, 1.6× usual Kobayashi, 11 February: 31.5 µg/m³, 4.5× usual Kobayashi, 12 February: 19.1 µg/m³, 2.7× usual Kobayashi, 13 February: 18.6 µg/m³, 2.7× usual Kobayashi, 14 February: 13.9 µg/m³, 2.0× usual Kobayashi, 15 February: 9.3 µg/m³, 1.3× usual Takanabe Takanabe, 8 February: 10.2 µg/m³, 1.1× usual Takanabe, 9 February: 10.5 µg/m³, 1.1× usual Takanabe, 10 February: 9.8 µg/m³, 1.0× usual Takanabe, 11 February: 31.4 µg/m³, 3.3× usual Takanabe, 12 February: 23.4 µg/m³, 2.5× usual Takanabe, 13 February: 17.3 µg/m³, 1.8× usual Takanabe, 14 February: 14.7 µg/m³, 1.5× usual Takanabe, 15 February: 9.3 µg/m³, 1.0× usual Yanagawa Yanagawa, 8 February: 7.3 µg/m³, 0.9× usual Yanagawa, 9 February: 8.0 µg/m³, 1.0× usual Yanagawa, 10 February: 13.1 µg/m³, 1.6× usual Yanagawa, 11 February: 31.1 µg/m³, 3.7× usual Yanagawa, 12 February: 20.6 µg/m³, 2.5× usual Yanagawa, 13 February: 15.3 µg/m³, 1.8× usual Yanagawa, 14 February: 19.5 µg/m³, 2.3× usual Yanagawa, 15 February: 10.7 µg/m³, 1.3× usual Shintomi Shintomi, 8 February: 9.8 µg/m³, 1.3× usual Shintomi, 9 February: 7.6 µg/m³, 1.0× usual Shintomi, 10 February: 8.2 µg/m³, 1.1× usual Shintomi, 11 February: 30.8 µg/m³, 4.0× usual Shintomi, 12 February: 20.1 µg/m³, 2.6× usual Shintomi, 13 February: 14.2 µg/m³, 1.8× usual Shintomi, 14 February: 12.5 µg/m³, 1.6× usual Shintomi, 15 February: 7.0 µg/m³, 0.9× usual 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× Kasaoka Okayama, Japan 1 14 February 8.1 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× Isahaya Nagasaki, Japan 1 11 February 7.1 5.0× Nagasaki Nagasaki, Japan 1 11 February 8.1 5.0× Itoshima Fukuoka, Japan 1 11 February 8.1 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× Niihama Ehime, Japan 1 15 February 9.3 4.7× Sasebo Nagasaki, Japan 1 11 February 9.1 4.6× Shikokuchūō Ehime, Japan 1 15 February 9.4 4.6× Kushikino Kagoshima, Japan 1 11 February 7.8 4.6× Buzen Fukuoka, Japan 1 11 February 7.2 4.6× Kashima Saga, Japan 1 11 February 8.6 4.5× Koga Fukuoka, Japan 1 11 February 8.1 4.5× Imarichō-kō Saga, Japan 1 11 February 8.7 4.5× Kobayashi Miyazaki, Japan 1 11 February 7.0 4.5× Maebaru-chūō Fukuoka, Japan 2 11 February 10.4 4.5× Takeo Saga, Japan 1 11 February 8.3 4.5× Nakama Fukuoka, Japan 1 11 February 7.3 4.4× Kurume Fukuoka, Japan 1 11 February 7.7 4.4× Fukuyama Hiroshima, Japan 1 14 February 9.4 4.3× Tsurusaki Oita, Japan 2 11 February 8.1 4.3× Izumi Kagoshima, Japan 1 11 February 8.1 4.2× Yame Fukuoka, Japan 1 11 February 7.9 4.1× Miyazaki Miyazaki, Japan 1 11 February 8.0 4.1× Kitakyushu Fukuoka, Japan 1 11 February 8.6 4.1× Kagoshima Kagoshima, Japan 1 11 February 8.7 4.1× Higashigō Saga, Japan 2 11 February 9.3 4.0× Zentsujichó Kagawa, Japan 1 11 February 6.6 4.0× Yukuhashi Fukuoka, Japan 2 11 February 8.1 4.0× Iizuka Fukuoka, Japan 1 11 February 8.6 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× Fukuoka Fukuoka, Japan 1 11 February 9.3 4.0× Marugame Kagawa, Japan 1 11 February 7.2 4.0× Narutochō-mitsuishi Tokushima, Japan 1 11 February 7.0 3.9× Koga Fukuoka, Japan 2 11 February 8.7 3.9× Ukiha Fukuoka, Japan 2 11 February 8.4 3.9× Tanushimarumachi-toyoki Fukuoka, Japan 2 11 February 10.8 3.9× Shimonoseki Yamaguchi, Japan 1 11 February 8.5 3.9× Taku Saga, Japan 1 11 February 8.5 3.8× Kasuga Fukuoka, Japan 1 11 February 8.3 3.8× Kan’onjichō Kagawa, Japan 1 15 February 9.1 3.8× Chikugo Fukuoka, Japan 2 11 February 9.5 3.8× Kaseda-shirakame Kagoshima, Japan 1 11 February 7.7 3.8× Nagato Yamaguchi, Japan 1 11 February 8.5 3.8× Ōita Oita, Japan 1 11 February 7.4 3.8× Nakatsu Oita, Japan 2 11 February 9.1 3.8× Yanagawa Fukuoka, Japan 1 11 February 8.3 3.7× Nobeoka Miyazaki, Japan 1 11 February 8.2 3.7× Saga Saga, Japan 1 11 February 8.9 3.6× Tosu Saga, Japan 1 11 February 9.0 3.6× Kanzakimachi-kanzaki Saga, Japan 1 11 February 8.9 3.6× Kanda Fukuoka, Japan 1 11 February 8.1 3.6× Nichinan Miyazaki, Japan 1 11 February 8.5 3.6× Tagawa Fukuoka, Japan 1 11 February 9.1 3.5× Nōgata Fukuoka, Japan 2 11 February 9.0 3.5× Ube Yamaguchi, Japan 1 11 February 7.9 3.4× Arida Wakayama, Japan 1 11 February 7.7 3.4× Ōmuta Fukuoka, Japan 1 11 February 10.8 3.4× Kure Hiroshima, Japan 1 11 February 7.7 3.4× Shūnan Yamaguchi, Japan 1 11 February 7.7 3.4× Ogōri Fukuoka, Japan 1 11 February 9.1 3.3× Takanabe Miyazaki, Japan 1 11 February 9.5 3.3× Miyakonojō Miyazaki, Japan 1 11 February 11.2 3.3× Sendai Kagoshima, Japan 1 11 February 9.3 3.2× Saiki Oita, Japan 1 11 February 8.5 3.2× Iyo Ehime, Japan 1 11 February 8.7 3.1× Matsuyama Ehime, Japan 1 11 February 9.1 2.9× Hikari Yamaguchi, Japan 1 11 February 9.3 2.9× Hyūga Miyazaki, Japan 1 11 February 9.3 2.7× Onoda Yamaguchi, Japan 1 11 February 10.0 2.7× Tamano Okayama, Japan 1 11 February 10.0 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. 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 14 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, February 2024 85 Bars: cities reached; colour: the level of the episode's highest daily reading. All 39 .
Use this page SmogRank, Japan, February 2024: 85 cities with PM2.5 at twice their usual or more, 11 to 12 February 2024, smogrank.com/episodes/2024-02-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.
