SmogRank / Episodes / South Korea

South Korea and Japan, January 2026

For 4 days, from 15 to 18 January 2026, 169 cities in South Korea and Japan had PM2.5 at least twice their usual for the time of year. The worst reading was Pubal, Gyeonggi-do, South Korea: 84.8 µg/m³ on 16 January, about 3.6× its usual 23.6.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached169in 2 countries
Days415 to 18 January 2026
Worst day17 January137 cities counted
Furthest above usual5.6×Sinan

Day by day

17 January 137 cities at twice their usual or more
MasudaHamadaGōtsuchōHagiNagatoŌdachō-ōdaYamaguchiMineYaeHōfuShūnanŌtakeGionHiroshimaKudamatsuIzumoIwakuniUbeUnnanYanaiMiyoshiKureHigashihiroshimaMatsueNakamaBuzenTakeharaNōgataKunisakiMunakataTagawaYasugichōSakaiminatoMiharaIizukaKogaYonagoMatsuyamaImabariWakasugiIyoBeppuFukuokaNiimiTsurusakiYawatahamaŌitaKasugaUkihaYufuTanushimarumachi-toyokiOgōriTosuSaijōItoshimaTakahashiYameTsukumiuraShinagawaNiihamaKanzakimachi-kanzakiUwajimaMieChikugoSaikiKurayoshiAsoSagaYanagawaKikuchiShikokuchūōTakuŌzuŌmutaTsushimaHigashigōMarugameTamanaUekimachi-mōnoZentsujichóAraoTsuyamaTakeoImarichō-kōInoKashimaSusakiKumamotoKotōIkedachōUreshinomachi-shimojukuMifuneTakinomiyaMatsuuraKochiNobeokaNakamuraUtoNankokuSaseboTottori-shiBizenŌmuraHiragiIsahayaHyūgaShidoŌyanomachi-noboritateHonmachiMimaSaikaiObitaTogitsuAkiNagasakiYoshinogawaKamojimachō-jōgejimaHondomachi-hondoTakanabeHitoyoshiMinamataTokushimaKobayashiMiyazakiToyookaIzumiAnanOnoNishiwakiSumotoMiyakonojōKyōtangoKirishimaFukuchiyamaSendaiNichinanMiyazuKobeGotōKushikinoSandachōAyabeMinatoKagoshimaAridaMaizuruKainanSennanTakarazukaIzumisanoGobōIwadeKishiwadaNantanToyonakaIzumiYonoSakaiKinokawaOsakaKameokaHigashiosakaSayamaTakatsukiTanabeYaoHabikinoKawachi-NaganoTondabayashichōHirakataBeolgyoHashimotoYawataIkomaObamaKyotoHōryūjiUjiSugaiJōyōKashiwaraNara-shiKashihara-shiKizugawaŌtsuTenriKitahamaKusatsuTakashimaTsurugaŌmihachimanNabariUeno-ebisumachiIgaKōkaYoukaichiShingūBuyeoSabaeHikoneMikuniNagahamaFukui-shiKumanoOwaseKagaKameyamaTsuOnoInabeIbiMatsusakaKomatsuSuzukaŌgakiYokkaichiKaizuMizuhoKuwanaSaikūHashimaMatsutōIseGifuNonoichiKanazawaAmaIchinomiyaSeogwipoTokonameKakamigaharaKaminomaTobaNagoyaShimaTōkaiTsubataHandaInuyamaKariyaHekinanMinokamoOwariasahiMinamichitaChiryūHakuiOyabeNisshinKaniNishioAnjōSetoTonamiTajimiToyotaOkazakiTokiTakaokaHimimachiGamagōriGeroAnamizuNanaoTaharaTakayamaImizuToyohashiToyamaShinshiroKosaiNamerikawaUozuNyūzenHamamatsuHamakitaNaesŏYangguTongyeongGoseongHadongMiryangBoseongHitaChangnyeongBusanChinjuGijangSinhyeonChangwonHongch’ŏnDonghae CitySuncheonYangsanYeosuGangneungSantyokuUngsangNamyangjuAndongKwangyangPohangWŏnjuYeongjuYŏnmuChangsuHwasunGyeongsan-siNakatsuKariyaKimhaeUlsanGimcheonGeojeKogaGwangyangHwacheonGumiCheorwonKoesanKinzanMokpoYeongdongYeonilYangp'yŏngNeietsuJeju CityJungpyongKimjeGwangjuNajuNonsanT’aebaekDaeguHikariAioiTamanoMaebaru-chūōHigashinozoeYecheonCheongsong gunJumunjinIksanGunsanNangenPyeongtaekTangjinFukuyamaChuncheonMunsanHwawŏnHwadoCheonanOsanSeonghwanSuwonBoryeongWaegwanKōtariKasaokaKitakyushuGaigeturiAnyang-siJinan-gunJeonjuHongseongGuri-siMasanNamsaBuanSangjuAmagasakiKan’onjichōKaratsuOnodaGanghwa-gunGyeongjuJeongeupHanamAnsan-siChungjuIncheonGwangjuKosongOkcheonSeosanYangjuTatsunoKakogawachō-honmachiNishinomiyaShin’ichiAkashiMungyeongHayangImsilSōjaAsakuchiKandaShimonosekiTakamatsuYeojuYeongamWabuAnseongCheongju-siHwaseong-siMuanDamyangUijeongbu-siYesanPubalYukuhashiJangseongChinch'ŏnGimpo-siKunwiSokchoAsanDaejeonWanjuIkarugaKurashikiOnomichiSeongnam-siIcheon-siGoyang-siSeoulSejongGwangmyeongHaenamBucheon-siYeonggwangHimejiNarutochō-mitsuishiOkayamaSekimachiGapyeongGongjuIkiEisenJangheungShintomiKoch'angTaesal-liSinan
12 Jan131415161718192021
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

AsanAsan, 12 January: 15.0 µg/m³, 0.7× usualAsan, 13 January: 20.1 µg/m³, 1.0× usualAsan, 14 January: 12.0 µg/m³, 0.6× usualAsan, 15 January: 62.7 µg/m³, 3.1× usualAsan, 16 January: 74.9 µg/m³, 3.7× usualAsan, 17 January: 51.8 µg/m³, 2.5× usualAsan, 18 January: 50.5 µg/m³, 2.5× usualAsan, 19 January: 23.6 µg/m³, 1.2× usualAsan, 20 January: 13.4 µg/m³, 0.7× usualAsan, 21 January: 10.9 µg/m³, 0.5× usualGwangmyeongGwangmyeong, 12 January: 13.9 µg/m³, 0.8× usualGwangmyeong, 13 January: 15.2 µg/m³, 0.8× usualGwangmyeong, 14 January: 12.4 µg/m³, 0.7× usualGwangmyeong, 15 January: 47.5 µg/m³, 2.6× usualGwangmyeong, 16 January: 72.8 µg/m³, 3.9× usualGwangmyeong, 17 January: 41.8 µg/m³, 2.3× usualGwangmyeong, 18 January: 31.0 µg/m³, 1.7× usualGwangmyeong, 19 January: 22.1 µg/m³, 1.2× usualGwangmyeong, 20 January: 12.3 µg/m³, 0.7× usualGwangmyeong, 21 January: 11.0 µg/m³, 0.6× usualSejongSejong, 12 January: 15.5 µg/m³, 0.8× usualSejong, 13 January: 15.9 µg/m³, 0.9× usualSejong, 14 January: 11.4 µg/m³, 0.6× usualSejong, 15 January: 57.4 µg/m³, 3.1× usualSejong, 16 January: 72.4 µg/m³, 3.9× usualSejong, 17 January: 48.9 µg/m³, 2.6× usualSejong, 18 January: 49.8 µg/m³, 2.7× usualSejong, 19 January: 21.5 µg/m³, 1.2× usualSejong, 20 January: 12.3 µg/m³, 0.7× usualSejong, 21 January: 10.4 µg/m³, 0.6× usualOkcheonOkcheon, 12 January: 16.8 µg/m³, 0.8× usualOkcheon, 13 January: 22.6 µg/m³, 1.0× usualOkcheon, 14 January: 12.8 µg/m³, 0.6× usualOkcheon, 15 January: 67.4 µg/m³, 3.0× usualOkcheon, 16 January: 72.2 µg/m³, 3.3× usualOkcheon, 17 January: 47.7 µg/m³, 2.2× usualOkcheon, 18 January: 44.7 µg/m³, 2.0× usualOkcheon, 19 January: 28.0 µg/m³, 1.3× usualOkcheon, 20 January: 12.9 µg/m³, 0.6× usualOkcheon, 21 January: 14.2 µg/m³, 0.6× usualIcheon-siIcheon-si, 12 January: 16.6 µg/m³, 0.9× usualIcheon-si, 13 January: 14.1 µg/m³, 0.7× usualIcheon-si, 14 January: 12.2 µg/m³, 0.6× usualIcheon-si, 15 January: 44.2 µg/m³, 2.3× usualIcheon-si, 16 January: 72.1 µg/m³, 3.8× usualIcheon-si, 17 January: 45.3 µg/m³, 2.4× usualIcheon-si, 18 January: 37.3 µg/m³, 2.0× usualIcheon-si, 19 January: 19.5 µg/m³, 1.0× usualIcheon-si, 20 January: 10.5 µg/m³, 0.6× usualIcheon-si, 21 January: 9.4 µg/m³, 0.5× usualSeoulSeoul, 12 January: 15.7 µg/m³, 0.8× usualSeoul, 13 January: 15.3 µg/m³, 0.8× usualSeoul, 14 January: 12.5 µg/m³, 0.7× usualSeoul, 15 January: 44.8 µg/m³, 2.4× usualSeoul, 16 January: 71.3 µg/m³, 3.8× usualSeoul, 17 January: 42.3 µg/m³, 2.2× usualSeoul, 18 January: 27.6 µg/m³, 1.5× usualSeoul, 19 January: 23.0 µg/m³, 1.2× usualSeoul, 20 January: 13.3 µg/m³, 0.7× usualSeoul, 21 January: 12.1 µg/m³, 0.6× usualCheongju-siCheongju-si, 12 January: 15.2 µg/m³, 0.7× usualCheongju-si, 13 January: 17.4 µg/m³, 0.9× usualCheongju-si, 14 January: 12.6 µg/m³, 0.6× usualCheongju-si, 15 January: 54.0 µg/m³, 2.7× usualCheongju-si, 16 January: 70.9 µg/m³, 3.5× usualCheongju-si, 17 January: 49.3 µg/m³, 2.4× usualCheongju-si, 18 January: 45.0 µg/m³, 2.2× usualCheongju-si, 19 January: 23.4 µg/m³, 1.2× usualCheongju-si, 20 January: 12.7 µg/m³, 0.6× usualCheongju-si, 21 January: 12.2 µg/m³, 0.6× usualChinch'ŏnChinch'ŏn, 12 January: 14.1 µg/m³, 0.7× usualChinch'ŏn, 13 January: 18.6 µg/m³, 1.0× usualChinch'ŏn, 14 January: 14.0 µg/m³, 0.7× usualChinch'ŏn, 15 January: 57.0 µg/m³, 3.0× usualChinch'ŏn, 16 January: 70.3 µg/m³, 3.6× usualChinch'ŏn, 17 January: 51.7 µg/m³, 2.7× usualChinch'ŏn, 18 January: 47.5 µg/m³, 2.5× usualChinch'ŏn, 19 January: 24.7 µg/m³, 1.3× usualChinch'ŏn, 20 January: 14.3 µg/m³, 0.7× usualChinch'ŏn, 21 January: 14.4 µg/m³, 0.7× usualSeonghwanSeonghwan, 12 January: 14.2 µg/m³, 0.6× usualSeonghwan, 13 January: 18.8 µg/m³, 0.8× usualSeonghwan, 14 January: 15.3 µg/m³, 0.7× usualSeonghwan, 15 January: 63.6 µg/m³, 2.8× usualSeonghwan, 16 January: 69.8 µg/m³, 3.1× usualSeonghwan, 17 January: 58.2 µg/m³, 2.6× usualSeonghwan, 18 January: 54.7 µg/m³, 2.4× usualSeonghwan, 19 January: 22.4 µg/m³, 1.0× usualSeonghwan, 20 January: 14.6 µg/m³, 0.6× usualSeonghwan, 21 January: 13.3 µg/m³, 0.6× usualHwadoHwado, 12 January: 20.3 µg/m³, 0.9× usualHwado, 13 January: 19.6 µg/m³, 0.9× usualHwado, 14 January: 15.7 µg/m³, 0.7× usualHwado, 15 January: 45.5 µg/m³, 2.1× usualHwado, 16 January: 68.2 µg/m³, 3.1× usualHwado, 17 January: 43.7 µg/m³, 2.0× usualHwado, 18 January: 31.0 µg/m³, 1.4× usualHwado, 19 January: 23.3 µg/m³, 1.1× usualHwado, 20 January: 14.1 µg/m³, 0.6× usualHwado, 21 January: 15.0 µg/m³, 0.7× usualChungjuChungju, 12 January: 16.6 µg/m³, 0.8× usualChungju, 13 January: 16.1 µg/m³, 0.8× usualChungju, 14 January: 11.4 µg/m³, 0.5× usualChungju, 15 January: 50.1 µg/m³, 2.4× usualChungju, 16 January: 68.1 µg/m³, 3.3× usualChungju, 17 January: 44.8 µg/m³, 2.1× usualChungju, 18 January: 40.8 µg/m³, 2.0× usualChungju, 19 January: 26.3 µg/m³, 1.3× usualChungju, 20 January: 13.9 µg/m³, 0.7× usualChungju, 21 January: 13.2 µg/m³, 0.6× usualBucheon-siBucheon-si, 12 January: 13.6 µg/m³, 0.8× usualBucheon-si, 13 January: 14.5 µg/m³, 0.8× usualBucheon-si, 14 January: 12.6 µg/m³, 0.7× usualBucheon-si, 15 January: 44.6 µg/m³, 2.5× usualBucheon-si, 16 January: 67.8 µg/m³, 3.9× usualBucheon-si, 17 January: 38.0 µg/m³, 2.2× usualBucheon-si, 18 January: 29.4 µg/m³, 1.7× usualBucheon-si, 19 January: 19.3 µg/m³, 1.1× usualBucheon-si, 20 January: 12.0 µg/m³, 0.7× usualBucheon-si, 21 January: 10.8 µg/m³, 0.6× usualGimpo-siGimpo-si, 12 January: 15.5 µg/m³, 0.8× usualGimpo-si, 13 January: 16.8 µg/m³, 0.9× usualGimpo-si, 14 January: 15.8 µg/m³, 0.8× usualGimpo-si, 15 January: 41.7 µg/m³, 2.2× usualGimpo-si, 16 January: 67.6 µg/m³, 3.6× usualGimpo-si, 17 January: 37.7 µg/m³, 2.0× usualGimpo-si, 18 January: 29.3 µg/m³, 1.6× usualGimpo-si, 19 January: 21.8 µg/m³, 1.2× usualGimpo-si, 20 January: 12.7 µg/m³, 0.7× usualGimpo-si, 21 January: 11.6 µg/m³, 0.6× usualGoyang-siGoyang-si, 12 January: 12.3 µg/m³, 0.7× usualGoyang-si, 13 January: 13.8 µg/m³, 0.8× usualGoyang-si, 14 January: 11.9 µg/m³, 0.7× usualGoyang-si, 15 January: 39.1 µg/m³, 2.2× usualGoyang-si, 16 January: 67.2 µg/m³, 3.8× usualGoyang-si, 17 January: 35.5 µg/m³, 2.0× usualGoyang-si, 18 January: 26.0 µg/m³, 1.5× usualGoyang-si, 19 January: 18.3 µg/m³, 1.0× usualGoyang-si, 20 January: 8.5 µg/m³, 0.5× usualGoyang-si, 21 January: 7.9 µg/m³, 0.4× usualKinzanKinzan, 12 January: 15.7 µg/m³, 0.7× usualKinzan, 13 January: 25.2 µg/m³, 1.0× usualKinzan, 14 January: 16.1 µg/m³, 0.7× usualKinzan, 15 January: 67.1 µg/m³, 2.8× usualKinzan, 16 January: 55.8 µg/m³, 2.3× usualKinzan, 17 January: 38.4 µg/m³, 1.6× usualKinzan, 18 January: 42.1 µg/m³, 1.7× usualKinzan, 19 January: 30.7 µg/m³, 1.3× usualKinzan, 20 January: 14.1 µg/m³, 0.6× usualKinzan, 21 January: 12.5 µg/m³, 0.5× usualSangjuSangju, 12 January: 19.5 µg/m³, 0.9× usualSangju, 13 January: 23.9 µg/m³, 1.1× usualSangju, 14 January: 15.3 µg/m³, 0.7× usualSangju, 15 January: 42.4 µg/m³, 2.0× usualSangju, 16 January: 67.1 µg/m³, 3.2× usualSangju, 17 January: 45.5 µg/m³, 2.2× usualSangju, 18 January: 42.1 µg/m³, 2.0× usualSangju, 19 January: 32.6 µg/m³, 1.5× usualSangju, 20 January: 19.5 µg/m³, 0.9× usualSangju, 21 January: 18.2 µg/m³, 0.9× usualUijeongbu-siUijeongbu-si, 12 January: 14.4 µg/m³, 0.8× usualUijeongbu-si, 13 January: 13.8 µg/m³, 0.7× usualUijeongbu-si, 14 January: 13.1 µg/m³, 0.7× usualUijeongbu-si, 15 January: 39.6 µg/m³, 2.1× usualUijeongbu-si, 16 January: 65.5 µg/m³, 3.5× usualUijeongbu-si, 17 January: 39.4 µg/m³, 2.1× usualUijeongbu-si, 18 January: 27.0 µg/m³, 1.5× usualUijeongbu-si, 19 January: 20.4 µg/m³, 1.1× usualUijeongbu-si, 20 January: 10.9 µg/m³, 0.6× usualUijeongbu-si, 21 January: 11.9 µg/m³, 0.6× usualSeongnam-siSeongnam-si, 12 January: 14.0 µg/m³, 0.8× usualSeongnam-si, 13 January: 13.3 µg/m³, 0.8× usualSeongnam-si, 14 January: 11.4 µg/m³, 0.7× usualSeongnam-si, 15 January: 48.0 µg/m³, 2.8× usualSeongnam-si, 16 January: 64.8 µg/m³, 3.8× usualSeongnam-si, 17 January: 43.5 µg/m³, 2.5× usualSeongnam-si, 18 January: 29.5 µg/m³, 1.7× usualSeongnam-si, 19 January: 21.5 µg/m³, 1.3× usualSeongnam-si, 20 January: 11.6 µg/m³, 0.7× usualSeongnam-si, 21 January: 9.8 µg/m³, 0.6× usualYeongdongYeongdong, 12 January: 17.7 µg/m³, 0.8× usualYeongdong, 13 January: 19.7 µg/m³, 0.9× usualYeongdong, 14 January: 15.0 µg/m³, 0.7× usualYeongdong, 15 January: 53.7 µg/m³, 2.3× usualYeongdong, 16 January: 64.7 µg/m³, 2.8× usualYeongdong, 17 January: 43.8 µg/m³, 1.9× usualYeongdong, 18 January: 43.7 µg/m³, 1.9× usualYeongdong, 19 January: 30.8 µg/m³, 1.3× usualYeongdong, 20 January: 12.6 µg/m³, 0.6× usualYeongdong, 21 January: 15.1 µg/m³, 0.7× usualGwangjuGwangju, 12 January: 16.6 µg/m³, 0.8× usualGwangju, 13 January: 14.8 µg/m³, 0.8× usualGwangju, 14 January: 12.9 µg/m³, 0.7× usualGwangju, 15 January: 42.8 µg/m³, 2.2× usualGwangju, 16 January: 64.7 µg/m³, 3.3× usualGwangju, 17 January: 45.1 µg/m³, 2.3× usualGwangju, 18 January: 32.3 µg/m³, 1.6× usualGwangju, 19 January: 19.7 µg/m³, 1.0× usualGwangju, 20 January: 12.4 µg/m³, 0.6× usualGwangju, 21 January: 11.7 µg/m³, 0.6× usualWabuWabu, 12 January: 15.3 µg/m³, 0.8× usualWabu, 13 January: 18.5 µg/m³, 1.0× usualWabu, 14 January: 13.0 µg/m³, 0.7× usualWabu, 15 January: 45.4 µg/m³, 2.5× usualWabu, 16 January: 64.2 µg/m³, 3.5× usualWabu, 17 January: 46.5 µg/m³, 2.5× usualWabu, 18 January: 28.3 µg/m³, 1.5× usualWabu, 19 January: 24.1 µg/m³, 1.3× usualWabu, 20 January: 15.0 µg/m³, 0.8× usualWabu, 21 January: 16.3 µg/m³, 0.9× usualYesanYesan, 12 January: 10.5 µg/m³, 0.6× usualYesan, 13 January: 20.0 µg/m³, 1.1× usualYesan, 14 January: 8.3 µg/m³, 0.5× usualYesan, 15 January: 63.8 µg/m³, 3.5× usualYesan, 16 January: 61.4 µg/m³, 3.4× usualYesan, 17 January: 45.5 µg/m³, 2.5× usualYesan, 18 January: 48.1 µg/m³, 2.6× usualYesan, 19 January: 17.7 µg/m³, 1.0× usualYesan, 20 January: 9.0 µg/m³, 0.5× usualYesan, 21 January: 8.9 µg/m³, 0.5× usualKimjeKimje, 12 January: 18.7 µg/m³, 0.9× usualKimje, 13 January: 24.6 µg/m³, 1.1× usualKimje, 14 January: 19.0 µg/m³, 0.9× usualKimje, 15 January: 63.6 µg/m³, 2.9× usualKimje, 16 January: 50.4 µg/m³, 2.3× usualKimje, 17 January: 49.0 µg/m³, 2.2× usualKimje, 18 January: 57.1 µg/m³, 2.6× usualKimje, 19 January: 29.7 µg/m³, 1.4× usualKimje, 20 January: 13.7 µg/m³, 0.6× usualKimje, 21 January: 14.8 µg/m³, 0.7× usualGuri-siGuri-si, 12 January: 15.4 µg/m³, 0.8× usualGuri-si, 13 January: 14.3 µg/m³, 0.7× usualGuri-si, 14 January: 12.7 µg/m³, 0.6× usualGuri-si, 15 January: 41.7 µg/m³, 2.1× usualGuri-si, 16 January: 63.4 µg/m³, 3.2× usualGuri-si, 17 January: 41.7 µg/m³, 2.1× usualGuri-si, 18 January: 26.4 µg/m³, 1.3× usualGuri-si, 19 January: 22.4 µg/m³, 1.1× usualGuri-si, 20 January: 12.5 µg/m³, 0.6× usualGuri-si, 21 January: 12.9 µg/m³, 0.7× usualAnseongAnseong, 12 January: 9.7 µg/m³, 0.6× usualAnseong, 13 January: 13.3 µg/m³, 0.8× usualAnseong, 14 January: 11.0 µg/m³, 0.6× usualAnseong, 15 January: 46.8 µg/m³, 2.7× usualAnseong, 16 January: 62.1 µg/m³, 3.5× usualAnseong, 17 January: 52.0 µg/m³, 3.0× usualAnseong, 18 January: 44.3 µg/m³, 2.5× usualAnseong, 19 January: 18.7 µg/m³, 1.1× usualAnseong, 20 January: 10.6 µg/m³, 0.6× usualAnseong, 21 January: 9.3 µg/m³, 0.5× usualHongseongHongseong, 12 January: 15.8 µg/m³, 0.8× usualHongseong, 13 January: 18.2 µg/m³, 0.9× usualHongseong, 14 January: 11.2 µg/m³, 0.6× usualHongseong, 15 January: 61.6 µg/m³, 3.2× usualHongseong, 16 January: 50.2 µg/m³, 2.6× usualHongseong, 17 January: 40.0 µg/m³, 2.1× usualHongseong, 18 January: 46.3 µg/m³, 2.4× usualHongseong, 19 January: 16.9 µg/m³, 0.9× usualHongseong, 20 January: 9.8 µg/m³, 0.5× usualHongseong, 21 January: 8.9 µg/m³, 0.5× usualGongjuGongju, 12 January: 12.9 µg/m³, 0.8× usualGongju, 13 January: 17.4 µg/m³, 1.1× usualGongju, 14 January: 9.2 µg/m³, 0.6× usualGongju, 15 January: 50.9 µg/m³, 3.3× usualGongju, 16 January: 61.4 µg/m³, 4.0× usualGongju, 17 January: 40.0 µg/m³, 2.6× usualGongju, 18 January: 40.5 µg/m³, 2.6× usualGongju, 19 January: 18.0 µg/m³, 1.2× usualGongju, 20 January: 8.6 µg/m³, 0.6× usualGongju, 21 January: 8.1 µg/m³, 0.5× usualJungpyongJungpyong, 12 January: 18.3 µg/m³, 0.9× usualJungpyong, 13 January: 16.4 µg/m³, 0.8× usualJungpyong, 14 January: 10.7 µg/m³, 0.5× usualJungpyong, 15 January: 49.4 µg/m³, 2.4× usualJungpyong, 16 January: 61.2 µg/m³, 2.9× usualJungpyong, 17 January: 47.4 µg/m³, 2.3× usualJungpyong, 18 January: 41.4 µg/m³, 2.0× usualJungpyong, 19 January: 22.4 µg/m³, 1.1× usualJungpyong, 20 January: 11.9 µg/m³, 0.6× usualJungpyong, 21 January: 10.9 µg/m³, 0.5× usualKoch'angKoch'ang, 12 January: 9.3 µg/m³, 0.7× usualKoch'ang, 13 January: 19.0 µg/m³, 1.5× usualKoch'ang, 14 January: 7.4 µg/m³, 0.6× usualKoch'ang, 15 January: 60.3 µg/m³, 4.6× usualKoch'ang, 16 January: 33.1 µg/m³, 2.5× usualKoch'ang, 17 January: 38.7 µg/m³, 3.0× usualKoch'ang, 18 January: 44.0 µg/m³, 3.4× usualKoch'ang, 19 January: 20.5 µg/m³, 1.6× usualKoch'ang, 20 January: 7.4 µg/m³, 0.6× usualKoch'ang, 21 January: 7.1 µg/m³, 0.5× usualKoesanKoesan, 12 January: 13.3 µg/m³, 0.6× usualKoesan, 13 January: 17.6 µg/m³, 0.8× usualKoesan, 14 January: 11.1 µg/m³, 0.5× usualKoesan, 15 January: 50.2 µg/m³, 2.3× usualKoesan, 16 January: 60.3 µg/m³, 2.8× usualKoesan, 17 January: 38.8 µg/m³, 1.8× usualKoesan, 18 January: 38.4 µg/m³, 1.8× usualKoesan, 19 January: 25.1 µg/m³, 1.2× usualKoesan, 20 January: 15.3 µg/m³, 0.7× usualKoesan, 21 January: 15.3 µg/m³, 0.7× usualIncheonIncheon, 12 January: 15.5 µg/m³, 0.9× usualIncheon, 13 January: 14.9 µg/m³, 0.8× usualIncheon, 14 January: 13.9 µg/m³, 0.8× usualIncheon, 15 January: 39.6 µg/m³, 2.2× usualIncheon, 16 January: 60.1 µg/m³, 3.3× usualIncheon, 17 January: 38.8 µg/m³, 2.2× usualIncheon, 18 January: 30.7 µg/m³, 1.7× usualIncheon, 19 January: 19.8 µg/m³, 1.1× usualIncheon, 20 January: 13.5 µg/m³, 0.8× usualIncheon, 21 January: 11.3 µg/m³, 0.6× usualHanamHanam, 12 January: 14.0 µg/m³, 0.8× usualHanam, 13 January: 14.0 µg/m³, 0.8× usualHanam, 14 January: 11.2 µg/m³, 0.6× usualHanam, 15 January: 37.8 µg/m³, 2.1× usualHanam, 16 January: 59.8 µg/m³, 3.3× usualHanam, 17 January: 44.3 µg/m³, 2.4× usualHanam, 18 January: 27.8 µg/m³, 1.5× usualHanam, 19 January: 23.7 µg/m³, 1.3× usualHanam, 20 January: 12.4 µg/m³, 0.7× usualHanam, 21 January: 12.5 µg/m³, 0.7× usualHwaseong-siHwaseong-si, 12 January: 10.2 µg/m³, 0.6× usualHwaseong-si, 13 January: 12.3 µg/m³, 0.7× usualHwaseong-si, 14 January: 11.1 µg/m³, 0.7× usualHwaseong-si, 15 January: 44.9 µg/m³, 2.6× usualHwaseong-si, 16 January: 58.9 µg/m³, 3.5× usualHwaseong-si, 17 January: 37.6 µg/m³, 2.2× usualHwaseong-si, 18 January: 30.9 µg/m³, 1.8× usualHwaseong-si, 19 January: 15.2 µg/m³, 0.9× usualHwaseong-si, 20 January: 8.4 µg/m³, 0.5× usualHwaseong-si, 21 January: 5.9 µg/m³, 0.3× usualAnsan-siAnsan-si, 12 January: 13.1 µg/m³, 0.7× usualAnsan-si, 13 January: 14.0 µg/m³, 0.8× usualAnsan-si, 14 January: 11.4 µg/m³, 0.6× usualAnsan-si, 15 January: 42.1 µg/m³, 2.4× usualAnsan-si, 16 January: 58.6 µg/m³, 3.3× usualAnsan-si, 17 January: 40.0 µg/m³, 2.2× usualAnsan-si, 18 January: 30.3 µg/m³, 1.7× usualAnsan-si, 19 January: 17.0 µg/m³, 1.0× usualAnsan-si, 20 January: 11.6 µg/m³, 0.7× usualAnsan-si, 21 January: 9.3 µg/m³, 0.5× usualYangjuYangju, 12 January: 12.6 µg/m³, 0.7× usualYangju, 13 January: 12.3 µg/m³, 0.7× usualYangju, 14 January: 14.9 µg/m³, 0.9× usualYangju, 15 January: 40.5 µg/m³, 2.3× usualYangju, 16 January: 58.5 µg/m³, 3.3× usualYangju, 17 January: 37.3 µg/m³, 2.1× usualYangju, 18 January: 24.6 µg/m³, 1.4× usualYangju, 19 January: 16.7 µg/m³, 1.0× usualYangju, 20 January: 10.9 µg/m³, 0.6× usualYangju, 21 January: 12.4 µg/m³, 0.7× usualEisenEisen, 12 January: 14.3 µg/m³, 1.1× usualEisen, 13 January: 11.3 µg/m³, 0.8× usualEisen, 14 January: 8.4 µg/m³, 0.6× usualEisen, 15 January: 33.7 µg/m³, 2.5× usualEisen, 16 January: 57.8 µg/m³, 4.3× usualEisen, 17 January: 38.0 µg/m³, 2.8× usualEisen, 18 January: 32.8 µg/m³, 2.4× usualEisen, 19 January: 21.7 µg/m³, 1.6× usualEisen, 20 January: 8.0 µg/m³, 0.6× usualEisen, 21 January: 7.5 µg/m³, 0.6× usualBuanBuan, 12 January: 12.4 µg/m³, 0.7× usualBuan, 13 January: 19.7 µg/m³, 1.1× usualBuan, 14 January: 14.3 µg/m³, 0.8× usualBuan, 15 January: 57.5 µg/m³, 3.2× usualBuan, 16 January: 48.5 µg/m³, 2.7× usualBuan, 17 January: 43.0 µg/m³, 2.4× usualBuan, 18 January: 46.3 µg/m³, 2.6× usualBuan, 19 January: 21.5 µg/m³, 1.2× usualBuan, 20 January: 11.8 µg/m³, 0.7× usualBuan, 21 January: 8.9 µg/m³, 0.5× usualOsanOsan, 12 January: 11.0 µg/m³, 0.6× usualOsan, 13 January: 14.1 µg/m³, 0.8× usualOsan, 14 January: 10.1 µg/m³, 0.5× usualOsan, 15 January: 45.3 µg/m³, 2.5× usualOsan, 16 January: 57.5 µg/m³, 3.1× usualOsan, 17 January: 50.5 µg/m³, 2.7× usualOsan, 18 January: 36.5 µg/m³, 2.0× usualOsan, 19 January: 21.2 µg/m³, 1.2× usualOsan, 20 January: 13.9 µg/m³, 0.8× usualOsan, 21 January: 10.4 µg/m³, 0.6× usualWanjuWanju, 12 January: 7.9 µg/m³, 0.5× usualWanju, 13 January: 18.0 µg/m³, 1.1× usualWanju, 14 January: 8.9 µg/m³, 0.6× usualWanju, 15 January: 57.4 µg/m³, 3.7× usualWanju, 16 January: 46.3 µg/m³, 2.9× usualWanju, 17 January: 39.7 µg/m³, 2.5× usualWanju, 18 January: 46.6 µg/m³, 3.0× usualWanju, 19 January: 22.2 µg/m³, 1.4× usualWanju, 20 January: 7.9 µg/m³, 0.5× usualWanju, 21 January: 6.9 µg/m³, 0.4× usualWaegwanWaegwan, 12 January: 14.8 µg/m³, 0.8× usualWaegwan, 13 January: 17.2 µg/m³, 0.9× usualWaegwan, 14 January: 15.3 µg/m³, 0.8× usualWaegwan, 15 January: 40.9 µg/m³, 2.2× usualWaegwan, 16 January: 56.8 µg/m³, 3.1× usualWaegwan, 17 January: 40.8 µg/m³, 2.2× usualWaegwan, 18 January: 37.3 µg/m³, 2.0× usualWaegwan, 19 January: 31.2 µg/m³, 1.7× usualWaegwan, 20 January: 10.7 µg/m³, 0.6× usualWaegwan, 21 January: 12.6 µg/m³, 0.7× usualSuwonSuwon, 12 January: 13.1 µg/m³, 0.7× usualSuwon, 13 January: 14.5 µg/m³, 0.8× usualSuwon, 14 January: 12.7 µg/m³, 0.7× usualSuwon, 15 January: 45.9 µg/m³, 2.5× usualSuwon, 16 January: 56.7 µg/m³, 3.1× usualSuwon, 17 January: 45.7 µg/m³, 2.5× usualSuwon, 18 January: 32.2 µg/m³, 1.7× usualSuwon, 19 January: 19.7 µg/m³, 1.1× usualSuwon, 20 January: 13.1 µg/m³, 0.7× usualSuwon, 21 January: 10.5 µg/m³, 0.6× usualPyeongtaekPyeongtaek, 12 January: 11.5 µg/m³, 0.6× usualPyeongtaek, 13 January: 14.2 µg/m³, 0.8× usualPyeongtaek, 14 January: 11.8 µg/m³, 0.6× usualPyeongtaek, 15 January: 47.7 µg/m³, 2.5× usualPyeongtaek, 16 January: 56.5 µg/m³, 3.0× usualPyeongtaek, 17 January: 47.5 µg/m³, 2.5× usualPyeongtaek, 18 January: 41.8 µg/m³, 2.2× usualPyeongtaek, 19 January: 17.6 µg/m³, 0.9× usualPyeongtaek, 20 January: 11.0 µg/m³, 0.6× usualPyeongtaek, 21 January: 9.9 µg/m³, 0.5× usualBoryeongBoryeong, 12 January: 10.0 µg/m³, 0.6× usualBoryeong, 13 January: 19.4 µg/m³, 1.1× usualBoryeong, 14 January: 9.5 µg/m³, 0.5× usualBoryeong, 15 January: 55.8 µg/m³, 3.1× usualBoryeong, 16 January: 46.1 µg/m³, 2.6× usualBoryeong, 17 January: 42.3 µg/m³, 2.3× usualBoryeong, 18 January: 47.1 µg/m³, 2.6× usualBoryeong, 19 January: 17.9 µg/m³, 1.0× usualBoryeong, 20 January: 9.3 µg/m³, 0.5× usualBoryeong, 21 January: 7.4 µg/m³, 0.4× usualJeonjuJeonju, 12 January: 8.5 µg/m³, 0.5× usualJeonju, 13 January: 19.2 µg/m³, 1.1× usualJeonju, 14 January: 9.3 µg/m³, 0.5× usualJeonju, 15 January: 55.6 µg/m³, 3.2× usualJeonju, 16 January: 47.0 µg/m³, 2.7× usualJeonju, 17 January: 36.8 µg/m³, 2.1× usualJeonju, 18 January: 42.8 µg/m³, 2.5× usualJeonju, 19 January: 23.8 µg/m³, 1.4× usualJeonju, 20 January: 10.0 µg/m³, 0.6× usualJeonju, 21 January: 8.5 µg/m³, 0.5× usualAnyang-siAnyang-si, 12 January: 11.9 µg/m³, 0.7× usualAnyang-si, 13 January: 13.0 µg/m³, 0.7× usualAnyang-si, 14 January: 11.2 µg/m³, 0.6× usualAnyang-si, 15 January: 45.1 µg/m³, 2.6× usualAnyang-si, 16 January: 55.6 µg/m³, 3.2× usualAnyang-si, 17 January: 40.5 µg/m³, 2.3× usualAnyang-si, 18 January: 28.5 µg/m³, 1.6× usualAnyang-si, 19 January: 20.0 µg/m³, 1.1× usualAnyang-si, 20 January: 11.6 µg/m³, 0.7× usualAnyang-si, 21 January: 10.0 µg/m³, 0.6× usualTangjinTangjin, 12 January: 10.9 µg/m³, 0.6× usualTangjin, 13 January: 20.8 µg/m³, 1.1× usualTangjin, 14 January: 11.1 µg/m³, 0.6× usualTangjin, 15 January: 54.3 µg/m³, 2.9× usualTangjin, 16 January: 55.5 µg/m³, 3.0× usualTangjin, 17 January: 40.1 µg/m³, 2.2× usualTangjin, 18 January: 35.1 µg/m³, 1.9× usualTangjin, 19 January: 27.5 µg/m³, 1.5× usualTangjin, 20 January: 5.9 µg/m³, 0.3× usualTangjin, 21 January: 12.1 µg/m³, 0.7× usualDaejeonDaejeon, 12 January: 11.1 µg/m³, 0.7× usualDaejeon, 13 January: 17.5 µg/m³, 1.2× usualDaejeon, 14 January: 9.2 µg/m³, 0.6× usualDaejeon, 15 January: 51.8 µg/m³, 3.4× usualDaejeon, 16 January: 55.5 µg/m³, 3.7× usualDaejeon, 17 January: 41.4 µg/m³, 2.7× usualDaejeon, 18 January: 37.5 µg/m³, 2.5× usualDaejeon, 19 January: 22.4 µg/m³, 1.5× usualDaejeon, 20 January: 11.8 µg/m³, 0.8× usualDaejeon, 21 January: 11.2 µg/m³, 0.7× usualMasanMasan, 12 January: 13.9 µg/m³, 0.8× usualMasan, 13 January: 22.7 µg/m³, 1.3× usualMasan, 14 January: 14.9 µg/m³, 0.9× usualMasan, 15 January: 54.9 µg/m³, 3.2× usualMasan, 16 January: 48.7 µg/m³, 2.8× usualMasan, 17 January: 39.9 µg/m³, 2.3× usualMasan, 18 January: 38.8 µg/m³, 2.2× usualMasan, 19 January: 24.5 µg/m³, 1.4× usualMasan, 20 January: 9.7 µg/m³, 0.6× usualMasan, 21 January: 10.5 µg/m³, 0.6× usualKunwiKunwi, 12 January: 12.0 µg/m³, 0.8× usualKunwi, 13 January: 13.3 µg/m³, 0.9× usualKunwi, 14 January: 6.1 µg/m³, 0.4× usualKunwi, 15 January: 45.9 µg/m³, 3.0× usualKunwi, 16 January: 54.9 µg/m³, 3.6× usualKunwi, 17 January: 33.2 µg/m³, 2.2× usualKunwi, 18 January: 31.0 µg/m³, 2.0× usualKunwi, 19 January: 22.0 µg/m³, 1.4× usualKunwi, 20 January: 8.5 µg/m³, 0.6× usualKunwi, 21 January: 8.9 µg/m³, 0.6× usualPubalPubal, 12 January: 17.1 µg/m³, 0.7× usualPubal, 13 January: 15.1 µg/m³, 0.6× usualPubal, 14 January: 15.2 µg/m³, 0.6× usualPubal, 15 January: 47.3 µg/m³, 2.0× usualPubal, 16 January: 84.8 µg/m³, 3.6× usualPubal, 17 January: 60.5 µg/m³, 2.6× usualPubal, 18 January: 47.8 µg/m³, 2.0× usualPubal, 19 January: 23.3 µg/m³, 1.0× usualPubal, 20 January: 14.5 µg/m³, 0.6× usualPubal, 21 January: 13.4 µg/m³, 0.6× usualYeojuYeoju, 12 January: 14.4 µg/m³, 0.7× usualYeoju, 13 January: 15.5 µg/m³, 0.7× usualYeoju, 14 January: 12.1 µg/m³, 0.5× usualYeoju, 15 January: 39.8 µg/m³, 1.8× usualYeoju, 16 January: 76.8 µg/m³, 3.5× usualYeoju, 17 January: 48.6 µg/m³, 2.2× usualYeoju, 18 January: 33.3 µg/m³, 1.5× usualYeoju, 19 January: 21.7 µg/m³, 1.0× usualYeoju, 20 January: 12.6 µg/m³, 0.6× usualYeoju, 21 January: 13.0 µg/m³, 0.6× usualGapyeongGapyeong, 12 January: 15.3 µg/m³, 0.9× usualGapyeong, 13 January: 14.9 µg/m³, 0.9× usualGapyeong, 14 January: 13.4 µg/m³, 0.8× usualGapyeong, 15 January: 32.0 µg/m³, 1.9× usualGapyeong, 16 January: 66.8 µg/m³, 4.0× usualGapyeong, 17 January: 39.8 µg/m³, 2.4× usualGapyeong, 18 January: 30.9 µg/m³, 1.9× usualGapyeong, 19 January: 26.0 µg/m³, 1.6× usualGapyeong, 20 January: 13.3 µg/m³, 0.8× usualGapyeong, 21 January: 14.7 µg/m³, 0.9× usualGanghwa-gunGanghwa-gun, 12 January: 21.6 µg/m³, 1.1× usualGanghwa-gun, 13 January: 15.5 µg/m³, 0.8× usualGanghwa-gun, 14 January: 17.5 µg/m³, 0.9× usualGanghwa-gun, 15 January: 37.8 µg/m³, 1.9× usualGanghwa-gun, 16 January: 64.2 µg/m³, 3.3× usualGanghwa-gun, 17 January: 32.2 µg/m³, 1.6× usualGanghwa-gun, 18 January: 30.8 µg/m³, 1.6× usualGanghwa-gun, 19 January: 19.1 µg/m³, 1.0× usualGanghwa-gun, 20 January: 11.3 µg/m³, 0.6× usualGanghwa-gun, 21 January: 10.8 µg/m³, 0.6× usualYangp'yŏngYangp'yŏng, 12 January: 15.4 µg/m³, 0.7× usualYangp'yŏng, 13 January: 15.1 µg/m³, 0.7× usualYangp'yŏng, 14 January: 11.2 µg/m³, 0.5× usualYangp'yŏng, 15 January: 37.6 µg/m³, 1.7× usualYangp'yŏng, 16 January: 63.8 µg/m³, 2.9× usualYangp'yŏng, 17 January: 39.4 µg/m³, 1.8× usualYangp'yŏng, 18 January: 31.7 µg/m³, 1.4× usualYangp'yŏng, 19 January: 18.5 µg/m³, 0.8× usualYangp'yŏng, 20 January: 12.0 µg/m³, 0.5× usualYangp'yŏng, 21 January: 12.7 µg/m³, 0.6× usualYeongjuYeongju, 12 January: 18.3 µg/m³, 0.7× usualYeongju, 13 January: 18.7 µg/m³, 0.8× usualYeongju, 14 January: 15.9 µg/m³, 0.6× usualYeongju, 15 January: 42.5 µg/m³, 1.7× usualYeongju, 16 January: 63.8 µg/m³, 2.6× usualYeongju, 17 January: 45.2 µg/m³, 1.8× usualYeongju, 18 January: 41.1 µg/m³, 1.7× usualYeongju, 19 January: 32.2 µg/m³, 1.3× usualYeongju, 20 January: 15.8 µg/m³, 0.6× usualYeongju, 21 January: 18.0 µg/m³, 0.7× usualGumiGumi, 12 January: 19.0 µg/m³, 0.9× usualGumi, 13 January: 20.7 µg/m³, 0.9× usualGumi, 14 January: 16.3 µg/m³, 0.7× usualGumi, 15 January: 43.4 µg/m³, 1.9× usualGumi, 16 January: 63.5 µg/m³, 2.8× usualGumi, 17 January: 40.7 µg/m³, 1.8× usualGumi, 18 January: 40.3 µg/m³, 1.8× usualGumi, 19 January: 28.9 µg/m³, 1.3× usualGumi, 20 January: 12.4 µg/m³, 0.6× usualGumi, 21 January: 7.4 µg/m³, 0.3× usualWŏnjuWŏnju, 12 January: 15.6 µg/m³, 0.7× usualWŏnju, 13 January: 16.0 µg/m³, 0.7× usualWŏnju, 14 January: 14.3 µg/m³, 0.6× usualWŏnju, 15 January: 45.8 µg/m³, 1.9× usualWŏnju, 16 January: 62.0 µg/m³, 2.6× usualWŏnju, 17 January: 43.5 µg/m³, 1.8× usualWŏnju, 18 January: 40.7 µg/m³, 1.7× usualWŏnju, 19 January: 26.8 µg/m³, 1.1× usualWŏnju, 20 January: 14.4 µg/m³, 0.6× usualWŏnju, 21 January: 16.2 µg/m³, 0.7× usualMunsanMunsan, 12 January: 16.5 µg/m³, 0.9× usualMunsan, 13 January: 14.6 µg/m³, 0.8× usualMunsan, 14 January: 15.3 µg/m³, 0.8× usualMunsan, 15 January: 38.1 µg/m³, 2.0× usualMunsan, 16 January: 58.9 µg/m³, 3.1× usualMunsan, 17 January: 36.3 µg/m³, 1.9× usualMunsan, 18 January: 26.6 µg/m³, 1.4× usualMunsan, 19 January: 19.7 µg/m³, 1.0× usualMunsan, 20 January: 11.4 µg/m³, 0.6× usualMunsan, 21 January: 13.6 µg/m³, 0.7× usualChuncheonChuncheon, 12 January: 11.5 µg/m³, 0.6× usualChuncheon, 13 January: 13.5 µg/m³, 0.7× usualChuncheon, 14 January: 11.0 µg/m³, 0.6× usualChuncheon, 15 January: 20.2 µg/m³, 1.1× usualChuncheon, 16 January: 56.0 µg/m³, 3.1× usualChuncheon, 17 January: 33.5 µg/m³, 1.9× usualChuncheon, 18 January: 30.3 µg/m³, 1.7× usualChuncheon, 19 January: 18.3 µg/m³, 1.0× usualChuncheon, 20 January: 9.7 µg/m³, 0.5× usualChuncheon, 21 January: 9.5 µg/m³, 0.5× usualMungyeongMungyeong, 12 January: 10.8 µg/m³, 0.7× usualMungyeong, 13 January: 13.5 µg/m³, 0.8× usualMungyeong, 14 January: 7.2 µg/m³, 0.4× usualMungyeong, 15 January: 33.3 µg/m³, 2.0× usualMungyeong, 16 January: 55.4 µg/m³, 3.4× usualMungyeong, 17 January: 33.6 µg/m³, 2.0× usualMungyeong, 18 January: 31.5 µg/m³, 1.9× usualMungyeong, 19 January: 21.1 µg/m³, 1.3× usualMungyeong, 20 January: 8.3 µg/m³, 0.5× usualMungyeong, 21 January: 7.1 µg/m³, 0.4× usual12 Jan131415161718192021
The 60 cities with the highest readings of 169, 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.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

Every city it reached

CityDaysHighestUsualAbove usual
SinanJeollanam-do, South Korea3 51.515 January9.25.6×
Taesal-liChungcheongnam-do, South Korea4 50.915 January10.44.9×
Koch'angJeollabuk-do, South Korea4 60.315 January13.14.6×
ShintomiMiyazaki, Japan1 35.318 January7.94.5×
JangheungJeollanam-do, South Korea4 43.716 January10.04.4×
EisenGyeongsangbuk-do, South Korea4 57.816 January13.64.3×
IkiNagasaki, Japan1 26.016 January6.34.1×
GapyeongGyeonggi-do, South Korea2 66.816 January16.64.0×
SekimachiGifu, Japan1 25.317 January6.34.0×
GongjuChungcheongnam-do, South Korea4 61.416 January15.34.0×
Narutochō-mitsuishiTokushima, Japan1 28.117 January7.14.0×
HimejiHyōgo, Japan1 27.717 January7.04.0×
OkayamaOkayama, Japan1 26.917 January6.84.0×
GwangmyeongGyeonggi-do, South Korea3 72.816 January18.53.9×
SejongSejong-si, South Korea4 72.416 January18.63.9×
YeonggwangJeollanam-do, South Korea4 48.615 January12.53.9×
HaenamJeollanam-do, South Korea4 50.115 January12.93.9×
Bucheon-siGyeonggi-do, South Korea3 67.816 January17.53.9×
IkarugaHyōgo, Japan1 25.717 January6.73.8×
OnomichiHiroshima, Japan3 31.817 January8.33.8×
Icheon-siGyeonggi-do, South Korea3 72.116 January19.03.8×
Seongnam-siGyeonggi-do, South Korea3 64.816 January17.13.8×
Goyang-siGyeonggi-do, South Korea3 67.216 January17.83.8×
KurashikiOkayama, Japan2 33.117 January8.83.8×
SeoulSeoul, South Korea3 71.316 January19.03.8×
WanjuJeollabuk-do, South Korea4 57.415 January15.73.7×
AsanChungcheongnam-do, South Korea4 74.916 January20.53.7×
DaejeonDaejeon, South Korea4 55.516 January15.23.7×
Chinch'ŏnNorth Chungcheong, South Korea4 70.316 January19.33.6×
YukuhashiFukuoka, Japan1 27.616 January7.63.6×
SokchoGangwon-do, South Korea1 35.215 January9.73.6×
KunwiGyeongsangbuk-do, South Korea4 54.916 January15.23.6×
Gimpo-siGyeonggi-do, South Korea3 67.616 January18.83.6×
PubalGyeonggi-do, South Korea3 84.816 January23.63.6×
JangseongJeollanam-do, South Korea4 49.715 January14.03.6×
Uijeongbu-siGyeonggi-do, South Korea3 65.516 January18.53.5×
KandaFukuoka, Japan1 26.216 January7.43.5×
SōjaOkayama, Japan1 28.317 January8.03.5×
AnseongGyeonggi-do, South Korea4 62.116 January17.63.5×
AsakuchiOkayama, Japan2 32.117 January9.13.5×
Cheongju-siNorth Chungcheong, South Korea4 70.916 January20.33.5×
MuanJeollanam-do, South Korea4 41.915 January12.03.5×
YesanChungcheongnam-do, South Korea4 63.815 January18.33.5×
ShimonosekiYamaguchi, Japan2 26.816 January7.73.5×
YeojuGyeonggi-do, South Korea2 76.816 January22.13.5×
WabuGyeonggi-do, South Korea3 64.216 January18.53.5×
Hwaseong-siGyeonggi-do, South Korea3 58.916 January17.03.5×
YeongamJeollanam-do, South Korea4 47.815 January13.83.5×
TakamatsuKagawa, Japan2 28.016 January8.13.5×
DamyangJeollanam-do, South Korea4 45.915 January13.33.5×
AkashiHyōgo, Japan2 29.317 January8.63.4×
Kakogawachō-honmachiHyōgo, Japan1 28.817 January8.53.4×
NishinomiyaHyōgo, Japan1 26.417 January7.83.4×
ImsilJeollabuk-do, South Korea4 53.015 January15.73.4×
TatsunoHyōgo, Japan1 25.917 January7.73.4×
MungyeongGyeongsangbuk-do, South Korea3 55.416 January16.53.4×
Shin’ichiHiroshima, Japan3 27.516 January8.23.4×
HayangGyeongsangbuk-do, South Korea4 50.316 January15.03.4×
YangjuGyeonggi-do, South Korea3 58.516 January17.53.3×
IncheonIncheon, South Korea3 60.116 January18.03.3×
KaratsuSaga, Japan1 26.716 January8.03.3×
JeongeupJeollabuk-do, South Korea4 54.315 January16.43.3×
HanamGyeonggi-do, South Korea3 59.816 January18.13.3×
GwangjuGyeonggi-do, South Korea3 64.716 January19.63.3×
GyeongjuGyeongsangbuk-do, South Korea3 45.516 January13.83.3×
KosongGangwon-do, South Korea1 31.315 January9.53.3×
Ansan-siGyeonggi-do, South Korea3 58.616 January17.83.3×
SeosanChungcheongnam-do, South Korea4 48.315 January14.73.3×
OnodaYamaguchi, Japan3 28.917 January8.83.3×
Ganghwa-gunIncheon, South Korea1 64.216 January19.63.3×
Kan’onjichōKagawa, Japan2 29.116 January8.93.3×
OkcheonNorth Chungcheong, South Korea4 72.216 January22.13.3×
ChungjuNorth Chungcheong, South Korea3 68.116 January20.93.3×
AmagasakiHyōgo, Japan1 28.017 January8.63.3×
KasaokaOkayama, Japan2 28.817 January8.93.2×
Guri-siGyeonggi-do, South Korea3 63.416 January19.63.2×
JeonjuJeollabuk-do, South Korea4 55.615 January17.23.2×
NamsaJeollabuk-do, South Korea4 53.915 January16.83.2×
BuanJeollabuk-do, South Korea4 57.515 January18.03.2×
HongseongChungcheongnam-do, South Korea4 61.615 January19.33.2×
KitakyushuFukuoka, Japan1 26.416 January8.33.2×
SangjuGyeongsangbuk-do, South Korea4 67.116 January21.13.2×
GaigeturiJeju-do, South Korea3 39.115 January12.33.2×
Jinan-gunJeollabuk-do, South Korea3 47.615 January15.03.2×
KōtariKyoto, Japan1 25.617 January8.13.2×
Anyang-siGyeonggi-do, South Korea3 55.616 January17.63.2×
MasanGwangju, South Korea4 54.915 January17.43.2×
HwadoGyeonggi-do, South Korea3 68.216 January21.83.1×
OsanGyeonggi-do, South Korea3 57.516 January18.43.1×
WaegwanGyeongsangbuk-do, South Korea4 56.816 January18.23.1×
BoryeongChungcheongnam-do, South Korea4 55.815 January18.03.1×
FukuyamaHiroshima, Japan2 28.516 January9.23.1×
ChuncheonGangwon-do, South Korea1 56.016 January18.13.1×
MunsanGyeonggi-do, South Korea1 58.916 January19.13.1×
SeonghwanChungcheongnam-do, South Korea4 69.816 January22.73.1×
CheonanChungcheongnam-do, South Korea4 52.216 January17.03.1×
SuwonGyeonggi-do, South Korea3 56.716 January18.53.1×
HwawŏnDaegu, South Korea4 44.716 January14.63.1×
HikariYamaguchi, Japan1 26.617 January8.83.0×
Maebaru-chūōFukuoka, Japan1 32.316 January10.73.0×
IksanJeollabuk-do, South Korea4 52.816 January17.53.0×
YecheonGyeongsangbuk-do, South Korea3 49.916 January16.63.0×
PyeongtaekGyeonggi-do, South Korea4 56.516 January18.83.0×
HigashinozoeHyōgo, Japan2 30.917 January10.33.0×
TamanoOkayama, Japan1 28.117 January9.43.0×
TangjinChungcheongnam-do, South Korea3 55.516 January18.63.0×
Cheongsong gunGyeongsangbuk-do, South Korea4 44.716 January15.03.0×
NangenJeollabuk-do, South Korea3 51.115 January17.23.0×
AioiHyōgo, Japan1 25.517 January8.63.0×
GunsanJeollabuk-do, South Korea4 54.515 January18.43.0×
JumunjinGangwon-do, South Korea1 30.115 January10.23.0×
NajuJeollanam-do, South Korea4 46.815 January15.92.9×
NeietsuGangwon-do, South Korea2 51.916 January17.72.9×
NonsanChungcheongnam-do, South Korea4 51.615 January17.62.9×
T’aebaekGangwon-do, South Korea3 36.915 January12.62.9×
GwangjuGwangju, South Korea4 48.315 January16.52.9×
KimjeJeollabuk-do, South Korea4 63.615 January21.82.9×
JungpyongNorth Chungcheong, South Korea4 61.216 January21.02.9×
Jeju CityJeju-do, South Korea4 39.015 January13.42.9×
Yangp'yŏngGyeonggi-do, South Korea1 63.816 January22.12.9×
DaeguDaegu, South Korea4 44.016 January15.32.9×
GumiGyeongsangbuk-do, South Korea1 63.516 January22.32.8×
CheorwonGangwon-do, South Korea3 54.616 January19.22.8×
GwangyangJeollanam-do, South Korea3 36.117 January12.72.8×
YeonilGyeongsangbuk-do, South Korea4 46.116 January16.32.8×
YeongdongNorth Chungcheong, South Korea3 64.716 January22.92.8×
KogaFukuoka, Japan1 26.216 January9.32.8×
KinzanChungcheongnam-do, South Korea2 67.115 January24.12.8×
KoesanNorth Chungcheong, South Korea2 60.316 January21.72.8×
MokpoJeollanam-do, South Korea4 45.515 January16.42.8×
HwacheonGangwon-do, South Korea2 46.016 January16.62.8×
GeojeGyeongsangnam-do, South Korea3 33.917 January12.32.8×
UlsanUlsan, South Korea3 38.216 January14.02.7×
KariyaHyōgo, Japan1 27.017 January9.92.7×
GimcheonGyeongsangbuk-do, South Korea2 53.816 January19.92.7×
NakatsuOita, Japan1 25.418 January9.42.7×
KimhaeGyeongsangnam-do, South Korea3 37.317 January13.92.7×
Gyeongsan-siGyeongsangbuk-do, South Korea4 45.816 January17.32.6×
ChangsuJeollabuk-do, South Korea1 43.615 January16.52.6×
YŏnmuChungcheongnam-do, South Korea4 51.915 January19.72.6×
HwasunJeollanam-do, South Korea4 32.515 January12.42.6×
KwangyangJeollanam-do, South Korea3 33.018 January12.62.6×
WŏnjuGangwon-do, South Korea1 62.016 January23.72.6×
PohangGyeongsangbuk-do, South Korea2 47.616 January18.22.6×
YeongjuGyeongsangbuk-do, South Korea1 63.816 January24.62.6×
NamyangjuGyeonggi-do, South Korea2 52.216 January20.22.6×
UngsangGyeongsangnam-do, South Korea1 32.517 January12.62.6×
AndongGyeongsangbuk-do, South Korea1 51.516 January20.02.6×
GangneungGangwon-do, South Korea1 39.815 January15.72.5×
SantyokuGangwon-do, South Korea1 41.315 January16.62.5×
YeosuJeollanam-do, South Korea3 32.017 January13.02.5×
YangsanGyeongsangnam-do, South Korea1 31.517 January12.82.5×
SuncheonJeollanam-do, South Korea3 30.015 January12.32.4×
Hongch’ŏnGangwon-do, South Korea1 51.716 January21.32.4×
ChangwonGyeongsangnam-do, South Korea3 32.017 January13.22.4×
SinhyeonGyeongsangnam-do, South Korea2 32.817 January13.82.4×
ChinjuGyeongsangnam-do, South Korea2 36.018 January15.22.4×
Donghae CityGangwon-do, South Korea1 38.115 January16.12.4×
GijangBusan, South Korea1 34.317 January14.52.4×
BusanBusan, South Korea2 37.317 January15.92.3×
ChangnyeongGyeongsangnam-do, South Korea3 32.217 January14.32.3×
BoseongJeollanam-do, South Korea4 29.215 January13.02.2×
MiryangGyeongsangnam-do, South Korea3 33.416 January15.02.2×
GoseongGyeongsangnam-do, South Korea2 32.717 January14.72.2×
HadongGyeongsangnam-do, South Korea3 27.517 January12.52.2×
HitaOita, Japan2 30.015 January13.72.2×
TongyeongGyeongsangnam-do, South Korea2 35.418 January16.42.2×
NaesŏGyeongsangnam-do, South Korea2 31.216 January14.62.1×
YangguGangwon-do, South Korea1 34.416 January16.72.1×

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 South Korea and Japan

Number 7 of 63 episodes in South Korea and Japan since our records began, by cities reached.

Bars: cities reached; colour: the level of the episode's highest daily reading. All 63.

Use this page

SmogRank, South Korea and Japan, January 2026: 169 cities with PM2.5 at twice their usual or more, 15 to 18 January 2026, smogrank.com/episodes/2026-01-south-korea-and-japan (accessed 2 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.