SmogRank / Episodes / South Korea

South Korea, April 2026

For 2 days, from 2 to 3 April 2026, 47 cities in South Korea had PM2.5 at least twice their usual for the time of year. The worst reading was Goyang-si, Gyeonggi-do, South Korea: 59.3 µg/m³ on 3 April, about 2.8× its usual 21.5.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached47in 1 country
Days22 to 3 April 2026
Worst day3 April45 cities counted
Furthest above usual2.8×Goyang-si

Day by day

3 April 45 cities at twice their usual or more
KinzanOkcheonNonsanYeongdongNamsaJinan-gunCheongju-siJeonjuBuyeoIksanChangsuJungpyongImsilKimjeChinch'ŏnGunsanYesanKoesanSeonghwanGimcheonJeongeupBuanNangenSangjuMungyeongChungjuGumiDamyangTangjinWaegwanIcheon-siPubalJangseongYeojuYecheonKunwiHwawŏnHadongHwasunChinjuYeonggwangSuncheonDaeguWŏnjuYangp'yŏngChangnyeongGwangyangHanamBeolgyoAndongYeongjuGyeongsan-siNamyangjuHwadoNeietsuBoseongHayangNaesŏMuanMiryangHongch’ŏnEisenGapyeongChangwonChuncheonCheongsong gunKimhaeYangsanGyeongjuT’aebaekHwacheonGeojeYeonilUngsangYangguCheorwonBusanPohangUlsanGijangGangneungSantyokuDonghae CityJumunjinSokchoKosongTsushimaIkiMunakataKogaNakamaKitakyushuShimonosekiNagatoMineKandaOnodaHagiUbeYamaguchiHōfuMasudaHamadaShūnanGōtsuchōKudamatsuHikariŌtakeYanaiIwakuniHwaseong-siMokpoAsanSeosanYangjuGwangmyeongSinhyeonAnsan-siCheonanGoseongGwangjuOsanPyeongtaekBoryeongTongyeongHaenamIncheonKoch'angGongjuGuri-siGwangjuKwangyangSeoulDaejeonWanjuHongseongTaesal-liSejongAnyang-siJangheungMasanBucheon-siSuwonUijeongbu-siSinanYŏnmuSeongnam-siAnseongGanghwa-gunKuryeNajuWabuGimpo-siYeosuYeongamMunsanGoyang-si
30 Mar311 Apr23456
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

SinhyeonSinhyeon, 30 March: 33.9 µg/m³, 2.1× usualSinhyeon, 31 March: 14.3 µg/m³, 0.9× usualSinhyeon, 1 April: 28.7 µg/m³, 1.7× usualSinhyeon, 2 April: 28.0 µg/m³, 1.7× usualSinhyeon, 3 April: 34.1 µg/m³, 2.1× usualSinhyeon, 4 April: 12.5 µg/m³, 0.8× usualSinhyeon, 5 April: 22.8 µg/m³, 1.4× usualSinhyeon, 6 April: 27.6 µg/m³, 1.7× usualHongseongHongseong, 30 March: 38.2 µg/m³, 1.7× usualHongseong, 31 March: 26.5 µg/m³, 1.2× usualHongseong, 1 April: 31.5 µg/m³, 1.4× usualHongseong, 2 April: 49.8 µg/m³, 2.2× usualHongseong, 3 April: 45.5 µg/m³, 2.0× usualHongseong, 4 April: 15.2 µg/m³, 0.7× usualHongseong, 5 April: 24.3 µg/m³, 1.1× usualHongseong, 6 April: 16.6 µg/m³, 0.7× usualYŏnmuYŏnmu, 30 March: 22.4 µg/m³, 1.0× usualYŏnmu, 31 March: 19.5 µg/m³, 0.9× usualYŏnmu, 1 April: 34.2 µg/m³, 1.6× usualYŏnmu, 2 April: 45.2 µg/m³, 2.1× usualYŏnmu, 3 April: 50.0 µg/m³, 2.3× usualYŏnmu, 4 April: 13.9 µg/m³, 0.6× usualYŏnmu, 5 April: 25.6 µg/m³, 1.2× usualYŏnmu, 6 April: 18.0 µg/m³, 0.8× usualBoryeongBoryeong, 30 March: 26.5 µg/m³, 1.3× usualBoryeong, 31 March: 27.8 µg/m³, 1.3× usualBoryeong, 1 April: 28.7 µg/m³, 1.4× usualBoryeong, 2 April: 43.2 µg/m³, 2.1× usualBoryeong, 3 April: 40.6 µg/m³, 1.9× usualBoryeong, 4 April: 12.8 µg/m³, 0.6× usualBoryeong, 5 April: 20.8 µg/m³, 1.0× usualBoryeong, 6 April: 11.5 µg/m³, 0.6× usualSinanSinan, 30 March: 24.2 µg/m³, 1.3× usualSinan, 31 March: 20.9 µg/m³, 1.2× usualSinan, 1 April: 15.4 µg/m³, 0.9× usualSinan, 2 April: 39.4 µg/m³, 2.2× usualSinan, 3 April: 40.5 µg/m³, 2.3× usualSinan, 4 April: 11.7 µg/m³, 0.6× usualSinan, 5 April: 21.4 µg/m³, 1.2× usualSinan, 6 April: 11.3 µg/m³, 0.6× usualTaesal-liTaesal-li, 30 March: 32.5 µg/m³, 2.0× usualTaesal-li, 31 March: 26.8 µg/m³, 1.6× usualTaesal-li, 1 April: 26.1 µg/m³, 1.6× usualTaesal-li, 2 April: 34.3 µg/m³, 2.1× usualTaesal-li, 3 April: 35.8 µg/m³, 2.2× usualTaesal-li, 4 April: 18.0 µg/m³, 1.1× usualTaesal-li, 5 April: 19.0 µg/m³, 1.2× usualTaesal-li, 6 April: 17.0 µg/m³, 1.0× usualYeongamYeongam, 30 March: 23.7 µg/m³, 1.5× usualYeongam, 31 March: 17.0 µg/m³, 1.1× usualYeongam, 1 April: 22.7 µg/m³, 1.5× usualYeongam, 2 April: 30.8 µg/m³, 2.0× usualYeongam, 3 April: 39.8 µg/m³, 2.6× usualYeongam, 4 April: 8.2 µg/m³, 0.5× usualYeongam, 5 April: 20.3 µg/m³, 1.3× usualYeongam, 6 April: 15.9 µg/m³, 1.0× usualGoyang-siGoyang-si, 30 March: 33.7 µg/m³, 1.6× usualGoyang-si, 31 March: 20.9 µg/m³, 1.0× usualGoyang-si, 1 April: 24.0 µg/m³, 1.1× usualGoyang-si, 2 April: 38.9 µg/m³, 1.8× usualGoyang-si, 3 April: 59.3 µg/m³, 2.8× usualGoyang-si, 4 April: 20.7 µg/m³, 1.0× usualGoyang-si, 5 April: 28.4 µg/m³, 1.3× usualGoyang-si, 6 April: 15.7 µg/m³, 0.7× usualGimpo-siGimpo-si, 30 March: 34.5 µg/m³, 1.5× usualGimpo-si, 31 March: 21.7 µg/m³, 0.9× usualGimpo-si, 1 April: 26.4 µg/m³, 1.1× usualGimpo-si, 2 April: 36.6 µg/m³, 1.6× usualGimpo-si, 3 April: 58.4 µg/m³, 2.5× usualGimpo-si, 4 April: 21.4 µg/m³, 0.9× usualGimpo-si, 5 April: 27.8 µg/m³, 1.2× usualGimpo-si, 6 April: 16.2 µg/m³, 0.7× usualMunsanMunsan, 30 March: 32.9 µg/m³, 1.6× usualMunsan, 31 March: 17.0 µg/m³, 0.8× usualMunsan, 1 April: 20.7 µg/m³, 1.0× usualMunsan, 2 April: 38.4 µg/m³, 1.8× usualMunsan, 3 April: 55.2 µg/m³, 2.7× usualMunsan, 4 April: 26.0 µg/m³, 1.3× usualMunsan, 5 April: 27.4 µg/m³, 1.3× usualMunsan, 6 April: 13.2 µg/m³, 0.6× usualGanghwa-gunGanghwa-gun, 30 March: 30.9 µg/m³, 1.4× usualGanghwa-gun, 31 March: 20.7 µg/m³, 0.9× usualGanghwa-gun, 1 April: 21.2 µg/m³, 0.9× usualGanghwa-gun, 2 April: 29.5 µg/m³, 1.3× usualGanghwa-gun, 3 April: 54.4 µg/m³, 2.4× usualGanghwa-gun, 4 April: 25.2 µg/m³, 1.1× usualGanghwa-gun, 5 April: 26.5 µg/m³, 1.2× usualGanghwa-gun, 6 April: 14.3 µg/m³, 0.6× usualIncheonIncheon, 30 March: 39.0 µg/m³, 1.6× usualIncheon, 31 March: 22.5 µg/m³, 0.9× usualIncheon, 1 April: 28.6 µg/m³, 1.2× usualIncheon, 2 April: 34.3 µg/m³, 1.4× usualIncheon, 3 April: 53.7 µg/m³, 2.2× usualIncheon, 4 April: 18.3 µg/m³, 0.8× usualIncheon, 5 April: 26.8 µg/m³, 1.1× usualIncheon, 6 April: 15.4 µg/m³, 0.6× usualBucheon-siBucheon-si, 30 March: 35.4 µg/m³, 1.5× usualBucheon-si, 31 March: 20.4 µg/m³, 0.9× usualBucheon-si, 1 April: 25.0 µg/m³, 1.1× usualBucheon-si, 2 April: 40.4 µg/m³, 1.8× usualBucheon-si, 3 April: 53.4 µg/m³, 2.3× usualBucheon-si, 4 April: 17.6 µg/m³, 0.8× usualBucheon-si, 5 April: 28.0 µg/m³, 1.2× usualBucheon-si, 6 April: 16.6 µg/m³, 0.7× usualAnseongAnseong, 30 March: 36.2 µg/m³, 1.7× usualAnseong, 31 March: 10.3 µg/m³, 0.5× usualAnseong, 1 April: 23.0 µg/m³, 1.1× usualAnseong, 2 April: 41.0 µg/m³, 1.9× usualAnseong, 3 April: 51.9 µg/m³, 2.4× usualAnseong, 4 April: 14.1 µg/m³, 0.7× usualAnseong, 5 April: 21.4 µg/m³, 1.0× usualAnseong, 6 April: 14.2 µg/m³, 0.7× usualPyeongtaekPyeongtaek, 30 March: 35.8 µg/m³, 1.5× usualPyeongtaek, 31 March: 14.5 µg/m³, 0.6× usualPyeongtaek, 1 April: 28.3 µg/m³, 1.2× usualPyeongtaek, 2 April: 38.4 µg/m³, 1.6× usualPyeongtaek, 3 April: 51.1 µg/m³, 2.1× usualPyeongtaek, 4 April: 16.6 µg/m³, 0.7× usualPyeongtaek, 5 April: 24.8 µg/m³, 1.0× usualPyeongtaek, 6 April: 18.8 µg/m³, 0.8× usualSuwonSuwon, 30 March: 30.0 µg/m³, 1.4× usualSuwon, 31 March: 14.6 µg/m³, 0.7× usualSuwon, 1 April: 18.0 µg/m³, 0.8× usualSuwon, 2 April: 43.2 µg/m³, 2.0× usualSuwon, 3 April: 50.3 µg/m³, 2.3× usualSuwon, 4 April: 16.7 µg/m³, 0.8× usualSuwon, 5 April: 30.3 µg/m³, 1.4× usualSuwon, 6 April: 16.8 µg/m³, 0.8× usualAnyang-siAnyang-si, 30 March: 30.3 µg/m³, 1.4× usualAnyang-si, 31 March: 18.5 µg/m³, 0.8× usualAnyang-si, 1 April: 19.8 µg/m³, 0.9× usualAnyang-si, 2 April: 41.0 µg/m³, 1.9× usualAnyang-si, 3 April: 49.9 µg/m³, 2.3× usualAnyang-si, 4 April: 18.6 µg/m³, 0.9× usualAnyang-si, 5 April: 28.8 µg/m³, 1.3× usualAnyang-si, 6 April: 17.2 µg/m³, 0.8× usualSeoulSeoul, 30 March: 35.8 µg/m³, 1.6× usualSeoul, 31 March: 16.0 µg/m³, 0.7× usualSeoul, 1 April: 19.2 µg/m³, 0.9× usualSeoul, 2 April: 38.2 µg/m³, 1.7× usualSeoul, 3 April: 49.7 µg/m³, 2.2× usualSeoul, 4 April: 18.5 µg/m³, 0.8× usualSeoul, 5 April: 28.2 µg/m³, 1.3× usualSeoul, 6 April: 15.2 µg/m³, 0.7× usualAsanAsan, 30 March: 38.6 µg/m³, 1.6× usualAsan, 31 March: 23.0 µg/m³, 1.0× usualAsan, 1 April: 37.4 µg/m³, 1.5× usualAsan, 2 April: 33.3 µg/m³, 1.4× usualAsan, 3 April: 49.3 µg/m³, 2.0× usualAsan, 4 April: 15.6 µg/m³, 0.6× usualAsan, 5 April: 25.2 µg/m³, 1.0× usualAsan, 6 April: 20.4 µg/m³, 0.8× usualHwaseong-siHwaseong-si, 30 March: 40.6 µg/m³, 1.7× usualHwaseong-si, 31 March: 23.8 µg/m³, 1.0× usualHwaseong-si, 1 April: 31.8 µg/m³, 1.3× usualHwaseong-si, 2 April: 42.1 µg/m³, 1.7× usualHwaseong-si, 3 April: 49.3 µg/m³, 2.0× usualHwaseong-si, 4 April: 16.4 µg/m³, 0.7× usualHwaseong-si, 5 April: 26.1 µg/m³, 1.1× usualHwaseong-si, 6 April: 15.2 µg/m³, 0.6× usualOsanOsan, 30 March: 29.3 µg/m³, 1.2× usualOsan, 31 March: 14.5 µg/m³, 0.6× usualOsan, 1 April: 21.8 µg/m³, 0.9× usualOsan, 2 April: 40.3 µg/m³, 1.7× usualOsan, 3 April: 49.2 µg/m³, 2.1× usualOsan, 4 April: 16.1 µg/m³, 0.7× usualOsan, 5 April: 27.5 µg/m³, 1.2× usualOsan, 6 April: 16.5 µg/m³, 0.7× usualAnsan-siAnsan-si, 30 March: 34.0 µg/m³, 1.5× usualAnsan-si, 31 March: 24.6 µg/m³, 1.1× usualAnsan-si, 1 April: 28.6 µg/m³, 1.3× usualAnsan-si, 2 April: 39.9 µg/m³, 1.7× usualAnsan-si, 3 April: 49.0 µg/m³, 2.1× usualAnsan-si, 4 April: 18.7 µg/m³, 0.8× usualAnsan-si, 5 April: 26.8 µg/m³, 1.2× usualAnsan-si, 6 April: 16.7 µg/m³, 0.7× usualSejongSejong, 30 March: 39.0 µg/m³, 1.9× usualSejong, 31 March: 15.2 µg/m³, 0.7× usualSejong, 1 April: 23.5 µg/m³, 1.1× usualSejong, 2 April: 31.3 µg/m³, 1.5× usualSejong, 3 April: 48.3 µg/m³, 2.3× usualSejong, 4 April: 11.6 µg/m³, 0.6× usualSejong, 5 April: 18.4 µg/m³, 0.9× usualSejong, 6 April: 19.3 µg/m³, 0.9× usualWanjuWanju, 30 March: 33.4 µg/m³, 1.5× usualWanju, 31 March: 23.4 µg/m³, 1.1× usualWanju, 1 April: 30.6 µg/m³, 1.4× usualWanju, 2 April: 40.0 µg/m³, 1.8× usualWanju, 3 April: 48.0 µg/m³, 2.2× usualWanju, 4 April: 14.1 µg/m³, 0.6× usualWanju, 5 April: 25.8 µg/m³, 1.2× usualWanju, 6 April: 19.2 µg/m³, 0.9× usualGwangmyeongGwangmyeong, 30 March: 33.4 µg/m³, 1.5× usualGwangmyeong, 31 March: 16.8 µg/m³, 0.8× usualGwangmyeong, 1 April: 17.7 µg/m³, 0.8× usualGwangmyeong, 2 April: 37.1 µg/m³, 1.7× usualGwangmyeong, 3 April: 47.1 µg/m³, 2.1× usualGwangmyeong, 4 April: 17.8 µg/m³, 0.8× usualGwangmyeong, 5 April: 28.6 µg/m³, 1.3× usualGwangmyeong, 6 April: 16.5 µg/m³, 0.7× usualGuri-siGuri-si, 30 March: 36.1 µg/m³, 1.7× usualGuri-si, 31 March: 14.8 µg/m³, 0.7× usualGuri-si, 1 April: 17.8 µg/m³, 0.8× usualGuri-si, 2 April: 33.2 µg/m³, 1.5× usualGuri-si, 3 April: 47.0 µg/m³, 2.2× usualGuri-si, 4 April: 18.3 µg/m³, 0.8× usualGuri-si, 5 April: 29.1 µg/m³, 1.3× usualGuri-si, 6 April: 13.8 µg/m³, 0.6× usualMasanMasan, 30 March: 31.3 µg/m³, 1.6× usualMasan, 31 March: 14.7 µg/m³, 0.7× usualMasan, 1 April: 23.5 µg/m³, 1.2× usualMasan, 2 April: 29.8 µg/m³, 1.5× usualMasan, 3 April: 46.0 µg/m³, 2.3× usualMasan, 4 April: 11.9 µg/m³, 0.6× usualMasan, 5 April: 19.1 µg/m³, 1.0× usualMasan, 6 April: 19.0 µg/m³, 1.0× usualSeongnam-siSeongnam-si, 30 March: 28.5 µg/m³, 1.5× usualSeongnam-si, 31 March: 13.2 µg/m³, 0.7× usualSeongnam-si, 1 April: 15.2 µg/m³, 0.8× usualSeongnam-si, 2 April: 37.2 µg/m³, 1.9× usualSeongnam-si, 3 April: 45.8 µg/m³, 2.4× usualSeongnam-si, 4 April: 15.8 µg/m³, 0.8× usualSeongnam-si, 5 April: 27.9 µg/m³, 1.4× usualSeongnam-si, 6 April: 15.5 µg/m³, 0.8× usualUijeongbu-siUijeongbu-si, 30 March: 33.3 µg/m³, 1.7× usualUijeongbu-si, 31 March: 14.6 µg/m³, 0.7× usualUijeongbu-si, 1 April: 16.8 µg/m³, 0.9× usualUijeongbu-si, 2 April: 30.4 µg/m³, 1.6× usualUijeongbu-si, 3 April: 45.3 µg/m³, 2.3× usualUijeongbu-si, 4 April: 19.0 µg/m³, 1.0× usualUijeongbu-si, 5 April: 26.6 µg/m³, 1.4× usualUijeongbu-si, 6 April: 12.6 µg/m³, 0.6× usualCheonanCheonan, 30 March: 35.0 µg/m³, 1.7× usualCheonan, 31 March: 16.1 µg/m³, 0.8× usualCheonan, 1 April: 26.2 µg/m³, 1.2× usualCheonan, 2 April: 32.0 µg/m³, 1.5× usualCheonan, 3 April: 45.3 µg/m³, 2.1× usualCheonan, 4 April: 14.0 µg/m³, 0.7× usualCheonan, 5 April: 21.8 µg/m³, 1.0× usualCheonan, 6 April: 19.0 µg/m³, 0.9× usualWabuWabu, 30 March: 34.9 µg/m³, 1.9× usualWabu, 31 March: 6.2 µg/m³, 0.3× usualWabu, 1 April: 13.8 µg/m³, 0.8× usualWabu, 2 April: 34.2 µg/m³, 1.9× usualWabu, 3 April: 45.0 µg/m³, 2.5× usualWabu, 4 April: 20.0 µg/m³, 1.1× usualWabu, 5 April: 27.8 µg/m³, 1.5× usualWabu, 6 April: 17.3 µg/m³, 1.0× usualGwangjuGwangju, 30 March: 26.0 µg/m³, 1.4× usualGwangju, 31 March: 13.1 µg/m³, 0.7× usualGwangju, 1 April: 21.2 µg/m³, 1.1× usualGwangju, 2 April: 25.1 µg/m³, 1.3× usualGwangju, 3 April: 43.0 µg/m³, 2.2× usualGwangju, 4 April: 10.7 µg/m³, 0.6× usualGwangju, 5 April: 17.9 µg/m³, 0.9× usualGwangju, 6 April: 17.1 µg/m³, 0.9× usualGwangjuGwangju, 30 March: 32.1 µg/m³, 1.6× usualGwangju, 31 March: 11.5 µg/m³, 0.6× usualGwangju, 1 April: 13.6 µg/m³, 0.7× usualGwangju, 2 April: 37.2 µg/m³, 1.9× usualGwangju, 3 April: 42.9 µg/m³, 2.1× usualGwangju, 4 April: 15.8 µg/m³, 0.8× usualGwangju, 5 April: 24.4 µg/m³, 1.2× usualGwangju, 6 April: 13.9 µg/m³, 0.7× usualNajuNaju, 30 March: 24.0 µg/m³, 1.3× usualNaju, 31 March: 13.6 µg/m³, 0.8× usualNaju, 1 April: 21.3 µg/m³, 1.2× usualNaju, 2 April: 24.7 µg/m³, 1.4× usualNaju, 3 April: 42.8 µg/m³, 2.4× usualNaju, 4 April: 7.1 µg/m³, 0.4× usualNaju, 5 April: 15.3 µg/m³, 0.9× usualNaju, 6 April: 12.6 µg/m³, 0.7× usualHaenamHaenam, 30 March: 27.6 µg/m³, 1.5× usualHaenam, 31 March: 23.5 µg/m³, 1.3× usualHaenam, 1 April: 20.7 µg/m³, 1.1× usualHaenam, 2 April: 23.8 µg/m³, 1.3× usualHaenam, 3 April: 40.1 µg/m³, 2.2× usualHaenam, 4 April: 15.1 µg/m³, 0.8× usualHaenam, 5 April: 25.8 µg/m³, 1.4× usualHaenam, 6 April: 16.3 µg/m³, 0.9× usualYeosuYeosu, 30 March: 18.0 µg/m³, 1.2× usualYeosu, 31 March: 7.4 µg/m³, 0.5× usualYeosu, 1 April: 14.3 µg/m³, 1.0× usualYeosu, 2 April: 15.4 µg/m³, 1.0× usualYeosu, 3 April: 39.6 µg/m³, 2.6× usualYeosu, 4 April: 5.9 µg/m³, 0.4× usualYeosu, 5 April: 13.3 µg/m³, 0.9× usualYeosu, 6 April: 13.5 µg/m³, 0.9× usualDaejeonDaejeon, 30 March: 21.3 µg/m³, 1.2× usualDaejeon, 31 March: 11.0 µg/m³, 0.6× usualDaejeon, 1 April: 14.6 µg/m³, 0.8× usualDaejeon, 2 April: 28.8 µg/m³, 1.6× usualDaejeon, 3 April: 39.5 µg/m³, 2.2× usualDaejeon, 4 April: 11.4 µg/m³, 0.6× usualDaejeon, 5 April: 18.0 µg/m³, 1.0× usualDaejeon, 6 April: 15.3 µg/m³, 0.8× usualSeosanSeosan, 30 March: 29.1 µg/m³, 1.5× usualSeosan, 31 March: 24.5 µg/m³, 1.3× usualSeosan, 1 April: 22.4 µg/m³, 1.2× usualSeosan, 2 April: 36.1 µg/m³, 1.9× usualSeosan, 3 April: 39.2 µg/m³, 2.0× usualSeosan, 4 April: 17.0 µg/m³, 0.9× usualSeosan, 5 April: 20.4 µg/m³, 1.1× usualSeosan, 6 April: 14.1 µg/m³, 0.7× usualGongjuGongju, 30 March: 23.5 µg/m³, 1.3× usualGongju, 31 March: 11.8 µg/m³, 0.7× usualGongju, 1 April: 22.6 µg/m³, 1.3× usualGongju, 2 April: 24.1 µg/m³, 1.3× usualGongju, 3 April: 39.1 µg/m³, 2.2× usualGongju, 4 April: 11.2 µg/m³, 0.6× usualGongju, 5 April: 18.1 µg/m³, 1.0× usualGongju, 6 April: 17.6 µg/m³, 1.0× usualJangheungJangheung, 30 March: 21.8 µg/m³, 1.3× usualJangheung, 31 March: 9.4 µg/m³, 0.6× usualJangheung, 1 April: 15.1 µg/m³, 0.9× usualJangheung, 2 April: 22.5 µg/m³, 1.3× usualJangheung, 3 April: 38.9 µg/m³, 2.3× usualJangheung, 4 April: 7.3 µg/m³, 0.4× usualJangheung, 5 April: 15.1 µg/m³, 0.9× usualJangheung, 6 April: 14.7 µg/m³, 0.9× usualKoch'angKoch'ang, 30 March: 28.3 µg/m³, 1.6× usualKoch'ang, 31 March: 24.4 µg/m³, 1.4× usualKoch'ang, 1 April: 26.3 µg/m³, 1.5× usualKoch'ang, 2 April: 32.8 µg/m³, 1.8× usualKoch'ang, 3 April: 38.7 µg/m³, 2.2× usualKoch'ang, 4 April: 12.2 µg/m³, 0.7× usualKoch'ang, 5 April: 19.1 µg/m³, 1.1× usualKoch'ang, 6 April: 14.7 µg/m³, 0.8× usualMokpoMokpo, 30 March: 25.5 µg/m³, 1.3× usualMokpo, 31 March: 25.1 µg/m³, 1.3× usualMokpo, 1 April: 24.9 µg/m³, 1.3× usualMokpo, 2 April: 31.8 µg/m³, 1.7× usualMokpo, 3 April: 38.4 µg/m³, 2.0× usualMokpo, 4 April: 11.6 µg/m³, 0.6× usualMokpo, 5 April: 22.9 µg/m³, 1.2× usualMokpo, 6 April: 15.6 µg/m³, 0.8× usualKwangyangKwangyang, 30 March: 26.3 µg/m³, 1.6× usualKwangyang, 31 March: 4.3 µg/m³, 0.3× usualKwangyang, 1 April: 17.7 µg/m³, 1.1× usualKwangyang, 2 April: 14.0 µg/m³, 0.8× usualKwangyang, 3 April: 36.6 µg/m³, 2.2× usualKwangyang, 4 April: 6.1 µg/m³, 0.4× usualKwangyang, 5 April: 12.1 µg/m³, 0.7× usualKwangyang, 6 April: 12.8 µg/m³, 0.8× usualTongyeongTongyeong, 30 March: 33.8 µg/m³, 2.1× usualTongyeong, 31 March: 7.4 µg/m³, 0.5× usualTongyeong, 1 April: 22.1 µg/m³, 1.4× usualTongyeong, 2 April: 24.5 µg/m³, 1.5× usualTongyeong, 3 April: 35.2 µg/m³, 2.2× usualTongyeong, 4 April: 8.9 µg/m³, 0.5× usualTongyeong, 5 April: 17.8 µg/m³, 1.1× usualTongyeong, 6 April: 18.6 µg/m³, 1.1× usualYangjuYangju, 30 March: 35.3 µg/m³, 2.0× usualYangju, 31 March: 10.9 µg/m³, 0.6× usualYangju, 1 April: 14.8 µg/m³, 0.9× usualYangju, 2 April: 27.0 µg/m³, 1.6× usualYangju, 3 April: 35.1 µg/m³, 2.0× usualYangju, 4 April: 19.6 µg/m³, 1.1× usualYangju, 5 April: 24.0 µg/m³, 1.4× usualYangju, 6 April: 10.1 µg/m³, 0.6× usualKuryeKurye, 30 March: 21.9 µg/m³, 1.5× usualKurye, 31 March: 3.8 µg/m³, 0.3× usualKurye, 1 April: 14.8 µg/m³, 1.0× usualKurye, 2 April: 15.5 µg/m³, 1.1× usualKurye, 3 April: 34.1 µg/m³, 2.4× usualKurye, 4 April: 8.5 µg/m³, 0.6× usualKurye, 5 April: 13.1 µg/m³, 0.9× usualKurye, 6 April: 15.1 µg/m³, 1.1× usualGoseongGoseong, 30 March: 29.7 µg/m³, 1.9× usualGoseong, 31 March: 8.1 µg/m³, 0.5× usualGoseong, 1 April: 24.3 µg/m³, 1.6× usualGoseong, 2 April: 20.5 µg/m³, 1.3× usualGoseong, 3 April: 31.8 µg/m³, 2.1× usualGoseong, 4 April: 8.7 µg/m³, 0.6× usualGoseong, 5 April: 14.2 µg/m³, 0.9× usualGoseong, 6 April: 17.4 µg/m³, 1.1× usual30 Mar311 Apr23456
Every counted city, in the order the episode reached them, 3 days before to 3 after. Each square is a day, coloured by that day's PM2.5; outlined: at twice the city's usual or more.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

Every city it reached

CityDaysHighestUsualAbove usual
Goyang-siGyeonggi-do, South Korea1 59.33 April21.52.8×
MunsanGyeonggi-do, South Korea1 55.23 April20.82.7×
YeosuJeollanam-do, South Korea1 39.63 April15.02.6×
YeongamJeollanam-do, South Korea2 39.83 April15.32.6×
Gimpo-siGyeonggi-do, South Korea1 58.43 April23.22.5×
WabuGyeonggi-do, South Korea1 45.03 April18.12.5×
AnseongGyeonggi-do, South Korea1 51.93 April21.42.4×
Ganghwa-gunIncheon, South Korea1 54.43 April22.62.4×
KuryeJeollanam-do, South Korea1 34.13 April14.22.4×
NajuJeollanam-do, South Korea1 42.83 April18.02.4×
Seongnam-siGyeonggi-do, South Korea1 45.83 April19.42.4×
SejongSejong-si, South Korea1 48.33 April20.72.3×
Bucheon-siGyeonggi-do, South Korea1 53.43 April22.92.3×
Uijeongbu-siGyeonggi-do, South Korea1 45.33 April19.52.3×
MasanGwangju, South Korea1 46.03 April20.02.3×
SuwonGyeonggi-do, South Korea1 50.33 April21.92.3×
Anyang-siGyeonggi-do, South Korea1 49.93 April21.82.3×
JangheungJeollanam-do, South Korea1 38.93 April17.02.3×
YŏnmuChungcheongnam-do, South Korea2 50.03 April21.92.3×
SinanJeollanam-do, South Korea2 40.53 April18.02.3×
GwangjuGwangju, South Korea1 43.03 April19.22.2×
IncheonIncheon, South Korea1 53.73 April24.12.2×
SeoulSeoul, South Korea1 49.73 April22.42.2×
WanjuJeollabuk-do, South Korea1 48.03 April21.72.2×
KwangyangJeollanam-do, South Korea1 36.63 April16.62.2×
HaenamJeollanam-do, South Korea1 40.13 April18.32.2×
GongjuChungcheongnam-do, South Korea1 39.13 April17.92.2×
HongseongChungcheongnam-do, South Korea1 49.82 April22.82.2×
Taesal-liChungcheongnam-do, South Korea2 35.83 April16.42.2×
DaejeonDaejeon, South Korea1 39.53 April18.22.2×
Guri-siGyeonggi-do, South Korea1 47.03 April21.72.2×
TongyeongGyeongsangnam-do, South Korea1 35.23 April16.32.2×
Koch'angJeollabuk-do, South Korea1 38.73 April18.02.2×
Ansan-siGyeonggi-do, South Korea1 49.03 April22.82.1×
CheonanChungcheongnam-do, South Korea1 45.33 April21.22.1×
GwangjuGyeonggi-do, South Korea1 42.93 April20.12.1×
PyeongtaekGyeonggi-do, South Korea1 51.13 April24.12.1×
GwangmyeongGyeonggi-do, South Korea1 47.13 April22.42.1×
GoseongGyeongsangnam-do, South Korea1 31.83 April15.32.1×
OsanGyeonggi-do, South Korea1 49.23 April23.72.1×
BoryeongChungcheongnam-do, South Korea1 43.22 April20.92.1×
SinhyeonGyeongsangnam-do, South Korea1 34.13 April16.52.1×
YangjuGyeonggi-do, South Korea1 35.330 March17.32.0×
AsanChungcheongnam-do, South Korea1 49.33 April24.22.0×
SeosanChungcheongnam-do, South Korea1 39.23 April19.42.0×
Hwaseong-siGyeonggi-do, South Korea1 49.33 April24.52.0×
MokpoJeollanam-do, South Korea1 38.43 April19.22.0×

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

Number 23 of 43 episodes in South Korea since our records began, by cities reached.

Bars: cities reached; colour: the level of the episode's highest daily reading. All 43.

Use this page

SmogRank, South Korea, April 2026: 47 cities with PM2.5 at twice their usual or more, 2 to 3 April 2026, smogrank.com/episodes/2026-04-south-korea (accessed 2 October 2026).

Download top 10 (PNG)

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.