SmogRank / Episodes / South Korea

South Korea, May 2026

For 1 day, on 2 May 2026, 57 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: 52.2 µg/m³ on 2 May, about 3.2× its usual 16.5.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached57in 1 country
Days12 May 2026
Worst day2 May57 cities counted
Furthest above usual3.2×Haenam

Day by day

2 May 57 cities at twice their usual or more
Jinan-gunJeonjuWanjuChangsuImsilKinzanNamsaYŏnmuIksanNangenKimjeOkcheonJeongeupDaejeonYeongdongBuyeoKuryeDamyangBuanGunsanJangseongGimcheonCheongju-siHadongHwasunKwangyangSuncheonGwangyangChinjuJungpyongSangjuBeolgyoGumiYeonggwangWaegwanKoesanBoseongYeosuMungyeongHwawŏnChangnyeongDaeguKunwiChungjuGoseongNaesŏYecheonGyeongsan-siMiryangChangwonHayangYeojuAndongEisenYeongjuWŏnjuKimhaeGeojeYangsanWabuCheongsong gunBusanGyeongjuUngsangHongch’ŏnGijangYeonilUlsanPohangT’aebaekHwacheonSantyokuGangneungDonghae CityJeju CityJumunjinTsushimaSokchoSeogwipoKosongIkiMatsuuraKaratsuSaseboImarichō-kōItoshimaMaebaru-chūōKogaTakeoTakuFukuokaMunakataUreshinomachi-shimojukuHigashigōKashimaKogaKasugaWakasugiNakamaSagaKanzakimachi-kanzakiNōgataIizukaTosuKitakyushuOgōriShimonosekiYanagawaTagawaChikugoNagatoTanushimarumachi-toyokiKandaYukuhashiMineYameUkihaOnodaHagiUbeHitaBuzenYamaguchiNakatsuHōfuMasudaShūnanYufuHamadaHijiKudamatsuBeppuKunisakiGōtsuchōHikariŌitaTsurusakiYanaiŌtakeIwakuniTsukumiuraCheonanIcheon-siGwangjuMasanSinhyeonJangheungTongyeongGongjuAsanSeonghwanPubalGaigeturiChinch'ŏnPyeongtaekTaesal-liYangguHongseongNonsanSeosanBoryeongTangjinYesanNeietsuSejongIncheonKoch'angMuanNajuOsanAnsan-siGanghwa-gunGuri-siGwangmyeongHanamChuncheonHwaseong-siGwangjuMokpoYangp'yŏngYeongamGapyeongSuwonNamyangjuHwadoGimpo-siBucheon-siSeoulSinanSeongnam-siAnseongAnyang-siCheorwonUijeongbu-siHaenamGoyang-siMunsanYangju
29 Apr301 May2345
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

SinanSinan, 29 April: 14.1 µg/m³, 1.1× usualSinan, 30 April: 17.2 µg/m³, 1.4× usualSinan, 1 May: 27.5 µg/m³, 2.2× usualSinan, 2 May: 35.8 µg/m³, 2.9× usualSinan, 3 May: no readingSinan, 4 May: 9.9 µg/m³, 0.8× usualSinan, 5 May: 9.7 µg/m³, 0.8× usualGoyang-siGoyang-si, 29 April: 12.0 µg/m³, 0.7× usualGoyang-si, 30 April: 13.0 µg/m³, 0.8× usualGoyang-si, 1 May: 17.8 µg/m³, 1.1× usualGoyang-si, 2 May: 52.2 µg/m³, 3.2× usualGoyang-si, 3 May: 17.5 µg/m³, 1.1× usualGoyang-si, 4 May: 8.1 µg/m³, 0.5× usualGoyang-si, 5 May: 12.8 µg/m³, 0.8× usualCheorwonCheorwon, 29 April: 9.3 µg/m³, 0.5× usualCheorwon, 30 April: 14.7 µg/m³, 0.9× usualCheorwon, 1 May: 15.1 µg/m³, 0.9× usualCheorwon, 2 May: 51.3 µg/m³, 3.0× usualCheorwon, 3 May: 17.0 µg/m³, 1.0× usualCheorwon, 4 May: 9.0 µg/m³, 0.5× usualCheorwon, 5 May: 13.6 µg/m³, 0.8× usualGimpo-siGimpo-si, 29 April: 13.9 µg/m³, 0.8× usualGimpo-si, 30 April: 18.5 µg/m³, 1.1× usualGimpo-si, 1 May: 19.4 µg/m³, 1.1× usualGimpo-si, 2 May: 48.3 µg/m³, 2.8× usualGimpo-si, 3 May: 18.0 µg/m³, 1.0× usualGimpo-si, 4 May: 10.3 µg/m³, 0.6× usualGimpo-si, 5 May: 14.2 µg/m³, 0.8× usualSeoulSeoul, 29 April: 12.7 µg/m³, 0.8× usualSeoul, 30 April: 14.7 µg/m³, 0.9× usualSeoul, 1 May: 18.4 µg/m³, 1.1× usualSeoul, 2 May: 46.8 µg/m³, 2.8× usualSeoul, 3 May: 14.0 µg/m³, 0.8× usualSeoul, 4 May: 9.2 µg/m³, 0.6× usualSeoul, 5 May: 12.7 µg/m³, 0.8× usualBucheon-siBucheon-si, 29 April: 11.8 µg/m³, 0.7× usualBucheon-si, 30 April: 15.8 µg/m³, 0.9× usualBucheon-si, 1 May: 18.0 µg/m³, 1.1× usualBucheon-si, 2 May: 46.7 µg/m³, 2.8× usualBucheon-si, 3 May: 15.4 µg/m³, 0.9× usualBucheon-si, 4 May: 8.3 µg/m³, 0.5× usualBucheon-si, 5 May: 13.2 µg/m³, 0.8× usualMunsanMunsan, 29 April: 10.3 µg/m³, 0.7× usualMunsan, 30 April: 11.6 µg/m³, 0.8× usualMunsan, 1 May: 14.8 µg/m³, 1.0× usualMunsan, 2 May: 46.3 µg/m³, 3.2× usualMunsan, 3 May: 11.8 µg/m³, 0.8× usualMunsan, 4 May: 6.4 µg/m³, 0.4× usualMunsan, 5 May: 8.9 µg/m³, 0.6× usualUijeongbu-siUijeongbu-si, 29 April: 10.3 µg/m³, 0.7× usualUijeongbu-si, 30 April: 11.5 µg/m³, 0.8× usualUijeongbu-si, 1 May: 16.1 µg/m³, 1.1× usualUijeongbu-si, 2 May: 45.8 µg/m³, 3.0× usualUijeongbu-si, 3 May: 13.5 µg/m³, 0.9× usualUijeongbu-si, 4 May: 7.5 µg/m³, 0.5× usualUijeongbu-si, 5 May: 10.2 µg/m³, 0.7× usualAnyang-siAnyang-si, 29 April: 13.8 µg/m³, 0.9× usualAnyang-si, 30 April: 15.6 µg/m³, 1.0× usualAnyang-si, 1 May: 18.4 µg/m³, 1.2× usualAnyang-si, 2 May: 45.5 µg/m³, 2.9× usualAnyang-si, 3 May: 15.1 µg/m³, 1.0× usualAnyang-si, 4 May: 9.2 µg/m³, 0.6× usualAnyang-si, 5 May: 12.6 µg/m³, 0.8× usualHwaseong-siHwaseong-si, 29 April: 15.5 µg/m³, 0.9× usualHwaseong-si, 30 April: 17.5 µg/m³, 1.0× usualHwaseong-si, 1 May: 20.3 µg/m³, 1.2× usualHwaseong-si, 2 May: 45.4 µg/m³, 2.6× usualHwaseong-si, 3 May: 14.9 µg/m³, 0.9× usualHwaseong-si, 4 May: 9.5 µg/m³, 0.6× usualHwaseong-si, 5 May: 14.8 µg/m³, 0.9× usualHwadoHwado, 29 April: 10.5 µg/m³, 0.6× usualHwado, 30 April: 13.1 µg/m³, 0.8× usualHwado, 1 May: 17.9 µg/m³, 1.1× usualHwado, 2 May: 45.3 µg/m³, 2.8× usualHwado, 3 May: 13.5 µg/m³, 0.8× usualHwado, 4 May: no readingHwado, 5 May: 13.2 µg/m³, 0.8× usualTangjinTangjin, 29 April: 17.4 µg/m³, 0.9× usualTangjin, 30 April: 25.0 µg/m³, 1.3× usualTangjin, 1 May: 23.3 µg/m³, 1.2× usualTangjin, 2 May: 45.0 µg/m³, 2.3× usualTangjin, 3 May: 21.8 µg/m³, 1.1× usualTangjin, 4 May: no readingTangjin, 5 May: 13.5 µg/m³, 0.7× usualGwangmyeongGwangmyeong, 29 April: 12.9 µg/m³, 0.8× usualGwangmyeong, 30 April: 15.8 µg/m³, 0.9× usualGwangmyeong, 1 May: 19.4 µg/m³, 1.1× usualGwangmyeong, 2 May: 44.5 µg/m³, 2.6× usualGwangmyeong, 3 May: 14.4 µg/m³, 0.9× usualGwangmyeong, 4 May: 8.6 µg/m³, 0.5× usualGwangmyeong, 5 May: 13.1 µg/m³, 0.8× usualSuwonSuwon, 29 April: 14.8 µg/m³, 0.9× usualSuwon, 30 April: 14.5 µg/m³, 0.9× usualSuwon, 1 May: 17.4 µg/m³, 1.1× usualSuwon, 2 May: 43.8 µg/m³, 2.7× usualSuwon, 3 May: 12.8 µg/m³, 0.8× usualSuwon, 4 May: 9.8 µg/m³, 0.6× usualSuwon, 5 May: 12.7 µg/m³, 0.8× usualYesanYesan, 29 April: 16.3 µg/m³, 0.9× usualYesan, 30 April: 14.8 µg/m³, 0.8× usualYesan, 1 May: 20.6 µg/m³, 1.1× usualYesan, 2 May: 43.5 µg/m³, 2.3× usualYesan, 3 May: 21.4 µg/m³, 1.1× usualYesan, 4 May: 10.0 µg/m³, 0.5× usualYesan, 5 May: 10.5 µg/m³, 0.5× usualGuri-siGuri-si, 29 April: 10.8 µg/m³, 0.6× usualGuri-si, 30 April: 14.1 µg/m³, 0.8× usualGuri-si, 1 May: 16.5 µg/m³, 1.0× usualGuri-si, 2 May: 43.4 µg/m³, 2.5× usualGuri-si, 3 May: 12.7 µg/m³, 0.7× usualGuri-si, 4 May: 8.1 µg/m³, 0.5× usualGuri-si, 5 May: 11.1 µg/m³, 0.6× usualAnsan-siAnsan-si, 29 April: 14.0 µg/m³, 0.8× usualAnsan-si, 30 April: 16.7 µg/m³, 0.9× usualAnsan-si, 1 May: 19.5 µg/m³, 1.1× usualAnsan-si, 2 May: 43.4 µg/m³, 2.5× usualAnsan-si, 3 May: 14.9 µg/m³, 0.8× usualAnsan-si, 4 May: 9.1 µg/m³, 0.5× usualAnsan-si, 5 May: 13.7 µg/m³, 0.8× usualIncheonIncheon, 29 April: 14.9 µg/m³, 0.8× usualIncheon, 30 April: 20.0 µg/m³, 1.1× usualIncheon, 1 May: 19.3 µg/m³, 1.1× usualIncheon, 2 May: 43.3 µg/m³, 2.4× usualIncheon, 3 May: 14.9 µg/m³, 0.8× usualIncheon, 4 May: 9.2 µg/m³, 0.5× usualIncheon, 5 May: 15.1 µg/m³, 0.8× usualSeonghwanSeonghwan, 29 April: 20.0 µg/m³, 1.0× usualSeonghwan, 30 April: 19.1 µg/m³, 0.9× usualSeonghwan, 1 May: 19.4 µg/m³, 0.9× usualSeonghwan, 2 May: 43.3 µg/m³, 2.1× usualSeonghwan, 3 May: 22.4 µg/m³, 1.1× usualSeonghwan, 4 May: 9.8 µg/m³, 0.5× usualSeonghwan, 5 May: 13.6 µg/m³, 0.6× usualAnseongAnseong, 29 April: 17.5 µg/m³, 1.2× usualAnseong, 30 April: 13.7 µg/m³, 0.9× usualAnseong, 1 May: 15.7 µg/m³, 1.1× usualAnseong, 2 May: 42.3 µg/m³, 2.9× usualAnseong, 3 May: no readingAnseong, 4 May: no readingAnseong, 5 May: 8.9 µg/m³, 0.6× usualPubalPubal, 29 April: 20.0 µg/m³, 1.1× usualPubal, 30 April: 19.1 µg/m³, 1.0× usualPubal, 1 May: 19.0 µg/m³, 1.0× usualPubal, 2 May: 41.1 µg/m³, 2.2× usualPubal, 3 May: no readingPubal, 4 May: 9.5 µg/m³, 0.5× usualPubal, 5 May: 14.3 µg/m³, 0.8× usualGanghwa-gunGanghwa-gun, 29 April: 13.5 µg/m³, 0.8× usualGanghwa-gun, 30 April: no readingGanghwa-gun, 1 May: 20.1 µg/m³, 1.2× usualGanghwa-gun, 2 May: 41.0 µg/m³, 2.5× usualGanghwa-gun, 3 May: 13.4 µg/m³, 0.8× usualGanghwa-gun, 4 May: 8.6 µg/m³, 0.5× usualGanghwa-gun, 5 May: 11.0 µg/m³, 0.7× usualYangjuYangju, 29 April: 8.8 µg/m³, 0.7× usualYangju, 30 April: 8.7 µg/m³, 0.7× usualYangju, 1 May: 11.5 µg/m³, 0.9× usualYangju, 2 May: 40.5 µg/m³, 3.2× usualYangju, 3 May: 9.1 µg/m³, 0.7× usualYangju, 4 May: 4.6 µg/m³, 0.4× usualYangju, 5 May: 4.5 µg/m³, 0.4× usualNamyangjuNamyangju, 29 April: 10.1 µg/m³, 0.7× usualNamyangju, 30 April: 12.7 µg/m³, 0.9× usualNamyangju, 1 May: 14.4 µg/m³, 1.0× usualNamyangju, 2 May: 40.5 µg/m³, 2.8× usualNamyangju, 3 May: 9.0 µg/m³, 0.6× usualNamyangju, 4 May: 8.0 µg/m³, 0.5× usualNamyangju, 5 May: 9.9 µg/m³, 0.7× usualPyeongtaekPyeongtaek, 29 April: 17.0 µg/m³, 0.9× usualPyeongtaek, 30 April: 16.4 µg/m³, 0.9× usualPyeongtaek, 1 May: 19.5 µg/m³, 1.1× usualPyeongtaek, 2 May: 40.2 µg/m³, 2.2× usualPyeongtaek, 3 May: 16.8 µg/m³, 0.9× usualPyeongtaek, 4 May: 9.8 µg/m³, 0.5× usualPyeongtaek, 5 May: 11.4 µg/m³, 0.6× usualOsanOsan, 29 April: 16.5 µg/m³, 1.0× usualOsan, 30 April: 15.5 µg/m³, 0.9× usualOsan, 1 May: 18.6 µg/m³, 1.1× usualOsan, 2 May: 40.1 µg/m³, 2.4× usualOsan, 3 May: 13.5 µg/m³, 0.8× usualOsan, 4 May: 7.9 µg/m³, 0.5× usualOsan, 5 May: 12.6 µg/m³, 0.7× usualYangp'yŏngYangp'yŏng, 29 April: 9.2 µg/m³, 0.6× usualYangp'yŏng, 30 April: 11.1 µg/m³, 0.7× usualYangp'yŏng, 1 May: 14.3 µg/m³, 0.9× usualYangp'yŏng, 2 May: 39.9 µg/m³, 2.6× usualYangp'yŏng, 3 May: 11.5 µg/m³, 0.7× usualYangp'yŏng, 4 May: 9.1 µg/m³, 0.6× usualYangp'yŏng, 5 May: 12.3 µg/m³, 0.8× usualSeongnam-siSeongnam-si, 29 April: 11.5 µg/m³, 0.8× usualSeongnam-si, 30 April: 12.6 µg/m³, 0.9× usualSeongnam-si, 1 May: 14.9 µg/m³, 1.1× usualSeongnam-si, 2 May: 39.8 µg/m³, 2.9× usualSeongnam-si, 3 May: 11.0 µg/m³, 0.8× usualSeongnam-si, 4 May: 7.8 µg/m³, 0.6× usualSeongnam-si, 5 May: 10.8 µg/m³, 0.8× usualHaenamHaenam, 29 April: 15.9 µg/m³, 1.3× usualHaenam, 30 April: 19.0 µg/m³, 1.5× usualHaenam, 1 May: 23.9 µg/m³, 1.9× usualHaenam, 2 May: 39.7 µg/m³, 3.2× usualHaenam, 3 May: 12.3 µg/m³, 1.0× usualHaenam, 4 May: no readingHaenam, 5 May: 11.0 µg/m³, 0.9× usualHanamHanam, 29 April: 11.3 µg/m³, 0.7× usualHanam, 30 April: 13.7 µg/m³, 0.9× usualHanam, 1 May: 15.6 µg/m³, 1.0× usualHanam, 2 May: 39.5 µg/m³, 2.6× usualHanam, 3 May: 11.9 µg/m³, 0.8× usualHanam, 4 May: 8.9 µg/m³, 0.6× usualHanam, 5 May: 11.6 µg/m³, 0.8× usualAsanAsan, 29 April: 17.7 µg/m³, 0.9× usualAsan, 30 April: 15.6 µg/m³, 0.8× usualAsan, 1 May: 17.2 µg/m³, 0.9× usualAsan, 2 May: 38.8 µg/m³, 2.1× usualAsan, 3 May: 24.3 µg/m³, 1.3× usualAsan, 4 May: 10.2 µg/m³, 0.5× usualAsan, 5 May: 10.5 µg/m³, 0.6× usualGwangjuGwangju, 29 April: 12.9 µg/m³, 0.9× usualGwangju, 30 April: 13.6 µg/m³, 0.9× usualGwangju, 1 May: 15.5 µg/m³, 1.0× usualGwangju, 2 May: 38.3 µg/m³, 2.6× usualGwangju, 3 May: 11.7 µg/m³, 0.8× usualGwangju, 4 May: 8.5 µg/m³, 0.6× usualGwangju, 5 May: 11.2 µg/m³, 0.8× usualHongseongHongseong, 29 April: 14.5 µg/m³, 0.9× usualHongseong, 30 April: 13.3 µg/m³, 0.8× usualHongseong, 1 May: 19.5 µg/m³, 1.2× usualHongseong, 2 May: 37.9 µg/m³, 2.3× usualHongseong, 3 May: 17.4 µg/m³, 1.0× usualHongseong, 4 May: 12.2 µg/m³, 0.7× usualHongseong, 5 May: 11.0 µg/m³, 0.7× usualIcheon-siIcheon-si, 29 April: 15.2 µg/m³, 0.8× usualIcheon-si, 30 April: 13.8 µg/m³, 0.8× usualIcheon-si, 1 May: 14.4 µg/m³, 0.8× usualIcheon-si, 2 May: 37.0 µg/m³, 2.0× usualIcheon-si, 3 May: 15.3 µg/m³, 0.8× usualIcheon-si, 4 May: 7.4 µg/m³, 0.4× usualIcheon-si, 5 May: 11.0 µg/m³, 0.6× usualSejongSejong, 29 April: 15.8 µg/m³, 1.1× usualSejong, 30 April: 15.3 µg/m³, 1.0× usualSejong, 1 May: 12.5 µg/m³, 0.9× usualSejong, 2 May: 35.9 µg/m³, 2.4× usualSejong, 3 May: 23.3 µg/m³, 1.6× usualSejong, 4 May: 9.6 µg/m³, 0.7× usualSejong, 5 May: 14.2 µg/m³, 1.0× usualGapyeongGapyeong, 29 April: 7.1 µg/m³, 0.5× usualGapyeong, 30 April: 9.0 µg/m³, 0.7× usualGapyeong, 1 May: 13.4 µg/m³, 1.0× usualGapyeong, 2 May: 35.8 µg/m³, 2.7× usualGapyeong, 3 May: 9.5 µg/m³, 0.7× usualGapyeong, 4 May: no readingGapyeong, 5 May: 8.1 µg/m³, 0.6× usualNonsanNonsan, 29 April: 15.3 µg/m³, 1.0× usualNonsan, 30 April: 15.5 µg/m³, 1.0× usualNonsan, 1 May: 14.8 µg/m³, 1.0× usualNonsan, 2 May: 35.7 µg/m³, 2.3× usualNonsan, 3 May: 13.9 µg/m³, 0.9× usualNonsan, 4 May: 8.4 µg/m³, 0.5× usualNonsan, 5 May: 11.6 µg/m³, 0.8× usualNajuNaju, 29 April: 12.1 µg/m³, 0.8× usualNaju, 30 April: 19.5 µg/m³, 1.4× usualNaju, 1 May: 17.7 µg/m³, 1.2× usualNaju, 2 May: 34.0 µg/m³, 2.4× usualNaju, 3 May: no readingNaju, 4 May: 7.5 µg/m³, 0.5× usualNaju, 5 May: 8.7 µg/m³, 0.6× usualYeongamYeongam, 29 April: 15.8 µg/m³, 1.3× usualYeongam, 30 April: 18.6 µg/m³, 1.5× usualYeongam, 1 May: 19.4 µg/m³, 1.6× usualYeongam, 2 May: 33.4 µg/m³, 2.7× usualYeongam, 3 May: 12.5 µg/m³, 1.0× usualYeongam, 4 May: 8.1 µg/m³, 0.7× usualYeongam, 5 May: 9.2 µg/m³, 0.7× usualBoryeongBoryeong, 29 April: 14.6 µg/m³, 1.0× usualBoryeong, 30 April: 12.1 µg/m³, 0.8× usualBoryeong, 1 May: 27.2 µg/m³, 1.9× usualBoryeong, 2 May: 33.3 µg/m³, 2.3× usualBoryeong, 3 May: 11.9 µg/m³, 0.8× usualBoryeong, 4 May: 8.9 µg/m³, 0.6× usualBoryeong, 5 May: 8.0 µg/m³, 0.5× usualSeosanSeosan, 29 April: 12.4 µg/m³, 0.9× usualSeosan, 30 April: 12.5 µg/m³, 0.9× usualSeosan, 1 May: 18.3 µg/m³, 1.3× usualSeosan, 2 May: 33.1 µg/m³, 2.3× usualSeosan, 3 May: 12.7 µg/m³, 0.9× usualSeosan, 4 May: 10.0 µg/m³, 0.7× usualSeosan, 5 May: 7.8 µg/m³, 0.5× usualCheonanCheonan, 29 April: 17.2 µg/m³, 1.1× usualCheonan, 30 April: 16.4 µg/m³, 1.0× usualCheonan, 1 May: 15.3 µg/m³, 1.0× usualCheonan, 2 May: 33.0 µg/m³, 2.0× usualCheonan, 3 May: 19.2 µg/m³, 1.2× usualCheonan, 4 May: 8.4 µg/m³, 0.5× usualCheonan, 5 May: 12.8 µg/m³, 0.8× usualChinch'ŏnChinch'ŏn, 29 April: 16.4 µg/m³, 1.1× usualChinch'ŏn, 30 April: 15.8 µg/m³, 1.0× usualChinch'ŏn, 1 May: 14.6 µg/m³, 1.0× usualChinch'ŏn, 2 May: 32.9 µg/m³, 2.2× usualChinch'ŏn, 3 May: 19.3 µg/m³, 1.3× usualChinch'ŏn, 4 May: 9.9 µg/m³, 0.7× usualChinch'ŏn, 5 May: 10.3 µg/m³, 0.7× usualMokpoMokpo, 29 April: 13.5 µg/m³, 1.1× usualMokpo, 30 April: 17.6 µg/m³, 1.4× usualMokpo, 1 May: 20.5 µg/m³, 1.6× usualMokpo, 2 May: 32.7 µg/m³, 2.6× usualMokpo, 3 May: 11.4 µg/m³, 0.9× usualMokpo, 4 May: 8.7 µg/m³, 0.7× usualMokpo, 5 May: 8.6 µg/m³, 0.7× usualMasanMasan, 29 April: 16.1 µg/m³, 1.0× usualMasan, 30 April: 20.2 µg/m³, 1.3× usualMasan, 1 May: 18.0 µg/m³, 1.2× usualMasan, 2 May: 31.7 µg/m³, 2.0× usualMasan, 3 May: 16.3 µg/m³, 1.1× usualMasan, 4 May: 9.7 µg/m³, 0.6× usualMasan, 5 May: 10.9 µg/m³, 0.7× usualKoch'angKoch'ang, 29 April: 15.5 µg/m³, 1.2× usualKoch'ang, 30 April: 17.0 µg/m³, 1.3× usualKoch'ang, 1 May: 16.9 µg/m³, 1.3× usualKoch'ang, 2 May: 30.8 µg/m³, 2.4× usualKoch'ang, 3 May: 11.4 µg/m³, 0.9× usualKoch'ang, 4 May: 8.8 µg/m³, 0.7× usualKoch'ang, 5 May: 7.8 µg/m³, 0.6× usualChuncheonChuncheon, 29 April: 4.5 µg/m³, 0.4× usualChuncheon, 30 April: 6.9 µg/m³, 0.6× usualChuncheon, 1 May: 11.3 µg/m³, 1.0× usualChuncheon, 2 May: 30.4 µg/m³, 2.6× usualChuncheon, 3 May: 7.3 µg/m³, 0.6× usualChuncheon, 4 May: 5.3 µg/m³, 0.4× usualChuncheon, 5 May: 7.0 µg/m³, 0.6× usualGongjuGongju, 29 April: 12.9 µg/m³, 1.0× usualGongju, 30 April: 11.8 µg/m³, 0.9× usualGongju, 1 May: 11.2 µg/m³, 0.8× usualGongju, 2 May: 28.5 µg/m³, 2.1× usualGongju, 3 May: 15.0 µg/m³, 1.1× usualGongju, 4 May: 7.5 µg/m³, 0.6× usualGongju, 5 May: 11.4 µg/m³, 0.9× usualMuanMuan, 29 April: 11.8 µg/m³, 1.0× usualMuan, 30 April: 14.6 µg/m³, 1.3× usualMuan, 1 May: 18.8 µg/m³, 1.6× usualMuan, 2 May: 28.1 µg/m³, 2.4× usualMuan, 3 May: 11.8 µg/m³, 1.0× usualMuan, 4 May: 7.6 µg/m³, 0.7× usualMuan, 5 May: 10.0 µg/m³, 0.9× usualSinhyeonSinhyeon, 29 April: 18.5 µg/m³, 1.4× usualSinhyeon, 30 April: 11.2 µg/m³, 0.8× usualSinhyeon, 1 May: 20.7 µg/m³, 1.6× usualSinhyeon, 2 May: 28.1 µg/m³, 2.1× usualSinhyeon, 3 May: 16.0 µg/m³, 1.2× usualSinhyeon, 4 May: 13.5 µg/m³, 1.0× usualSinhyeon, 5 May: 16.7 µg/m³, 1.3× usualGwangjuGwangju, 29 April: 13.5 µg/m³, 1.0× usualGwangju, 30 April: 17.8 µg/m³, 1.3× usualGwangju, 1 May: 15.3 µg/m³, 1.1× usualGwangju, 2 May: 27.9 µg/m³, 2.0× usualGwangju, 3 May: 14.7 µg/m³, 1.1× usualGwangju, 4 May: 10.3 µg/m³, 0.8× usualGwangju, 5 May: 11.6 µg/m³, 0.8× usualJangheungJangheung, 29 April: 12.2 µg/m³, 0.9× usualJangheung, 30 April: 16.6 µg/m³, 1.2× usualJangheung, 1 May: 17.2 µg/m³, 1.3× usualJangheung, 2 May: 27.6 µg/m³, 2.1× usualJangheung, 3 May: 13.1 µg/m³, 1.0× usualJangheung, 4 May: 8.3 µg/m³, 0.6× usualJangheung, 5 May: 7.8 µg/m³, 0.6× usualTongyeongTongyeong, 29 April: 9.8 µg/m³, 0.8× usualTongyeong, 30 April: no readingTongyeong, 1 May: 12.4 µg/m³, 1.0× usualTongyeong, 2 May: 27.4 µg/m³, 2.1× usualTongyeong, 3 May: 12.5 µg/m³, 1.0× usualTongyeong, 4 May: 7.2 µg/m³, 0.6× usualTongyeong, 5 May: 10.0 µg/m³, 0.8× usualTaesal-liTaesal-li, 29 April: 13.1 µg/m³, 1.1× usualTaesal-li, 30 April: 14.7 µg/m³, 1.2× usualTaesal-li, 1 May: 20.5 µg/m³, 1.7× usualTaesal-li, 2 May: 27.0 µg/m³, 2.2× usualTaesal-li, 3 May: 13.6 µg/m³, 1.1× usualTaesal-li, 4 May: 9.3 µg/m³, 0.8× usualTaesal-li, 5 May: 8.0 µg/m³, 0.7× usualGaigeturiGaigeturi, 29 April: 13.2 µg/m³, 1.1× usualGaigeturi, 30 April: 13.7 µg/m³, 1.1× usualGaigeturi, 1 May: 24.9 µg/m³, 2.0× usualGaigeturi, 2 May: 26.9 µg/m³, 2.2× usualGaigeturi, 3 May: 11.6 µg/m³, 1.0× usualGaigeturi, 4 May: 10.1 µg/m³, 0.8× usualGaigeturi, 5 May: 7.8 µg/m³, 0.6× usualNeietsuNeietsu, 29 April: 9.7 µg/m³, 0.9× usualNeietsu, 30 April: 8.8 µg/m³, 0.8× usualNeietsu, 1 May: 13.0 µg/m³, 1.2× usualNeietsu, 2 May: 26.0 µg/m³, 2.3× usualNeietsu, 3 May: 13.7 µg/m³, 1.2× usualNeietsu, 4 May: 8.9 µg/m³, 0.8× usualNeietsu, 5 May: 9.3 µg/m³, 0.8× usualYangguYanggu, 29 April: 4.6 µg/m³, 0.4× usualYanggu, 30 April: 7.7 µg/m³, 0.6× usualYanggu, 1 May: 9.7 µg/m³, 0.8× usualYanggu, 2 May: 25.6 µg/m³, 2.2× usualYanggu, 3 May: 7.5 µg/m³, 0.6× usualYanggu, 4 May: 5.4 µg/m³, 0.5× usualYanggu, 5 May: 7.3 µg/m³, 0.6× usual29 Apr301 May2345
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
HaenamJeollanam-do, South Korea1 39.72 May12.43.2×
MunsanGyeonggi-do, South Korea1 46.32 May14.53.2×
YangjuGyeonggi-do, South Korea1 40.52 May12.83.2×
Goyang-siGyeonggi-do, South Korea1 52.22 May16.53.2×
CheorwonGangwon-do, South Korea1 51.32 May17.03.0×
Uijeongbu-siGyeonggi-do, South Korea1 45.82 May15.23.0×
AnseongGyeonggi-do, South Korea1 42.32 May14.52.9×
Seongnam-siGyeonggi-do, South Korea1 39.82 May13.82.9×
Anyang-siGyeonggi-do, South Korea1 45.52 May15.82.9×
SinanJeollanam-do, South Korea1 35.82 May12.52.9×
SeoulSeoul, South Korea1 46.82 May16.72.8×
Bucheon-siGyeonggi-do, South Korea1 46.72 May16.72.8×
HwadoGyeonggi-do, South Korea1 45.32 May16.32.8×
NamyangjuGyeonggi-do, South Korea1 40.52 May14.62.8×
Gimpo-siGyeonggi-do, South Korea1 48.32 May17.52.8×
SuwonGyeonggi-do, South Korea1 43.82 May16.02.7×
YeongamJeollanam-do, South Korea1 33.42 May12.42.7×
GapyeongGyeonggi-do, South Korea1 35.82 May13.52.7×
Hwaseong-siGyeonggi-do, South Korea1 45.42 May17.22.6×
GwangmyeongGyeonggi-do, South Korea1 44.52 May16.92.6×
MokpoJeollanam-do, South Korea1 32.72 May12.62.6×
HanamGyeonggi-do, South Korea1 39.52 May15.32.6×
ChuncheonGangwon-do, South Korea1 30.42 May11.82.6×
Yangp'yŏngGyeonggi-do, South Korea1 39.92 May15.52.6×
GwangjuGyeonggi-do, South Korea1 38.32 May14.92.6×
Guri-siGyeonggi-do, South Korea1 43.42 May17.22.5×
Ganghwa-gunIncheon, South Korea1 41.02 May16.52.5×
Ansan-siGyeonggi-do, South Korea1 43.42 May17.62.5×
Koch'angJeollabuk-do, South Korea1 30.82 May12.62.4×
SejongSejong-si, South Korea1 35.92 May14.72.4×
MuanJeollanam-do, South Korea1 28.12 May11.62.4×
IncheonIncheon, South Korea1 43.32 May17.92.4×
NajuJeollanam-do, South Korea1 34.02 May14.32.4×
OsanGyeonggi-do, South Korea1 40.12 May16.92.4×
NeietsuGangwon-do, South Korea1 26.02 May11.12.3×
NonsanChungcheongnam-do, South Korea1 35.72 May15.42.3×
SeosanChungcheongnam-do, South Korea1 33.12 May14.52.3×
BoryeongChungcheongnam-do, South Korea1 33.32 May14.62.3×
YesanChungcheongnam-do, South Korea1 43.52 May19.12.3×
HongseongChungcheongnam-do, South Korea1 37.92 May16.82.3×
TangjinChungcheongnam-do, South Korea1 45.02 May20.02.3×
Taesal-liChungcheongnam-do, South Korea1 27.02 May12.22.2×
GaigeturiJeju-do, South Korea1 26.92 May12.22.2×
PyeongtaekGyeonggi-do, South Korea1 40.22 May18.32.2×
Chinch'ŏnNorth Chungcheong, South Korea1 32.92 May15.12.2×
PubalGyeonggi-do, South Korea1 41.12 May18.92.2×
YangguGangwon-do, South Korea1 25.62 May11.92.2×
SinhyeonGyeongsangnam-do, South Korea1 28.12 May13.22.1×
GongjuChungcheongnam-do, South Korea1 28.52 May13.42.1×
TongyeongGyeongsangnam-do, South Korea1 27.42 May13.02.1×
AsanChungcheongnam-do, South Korea1 38.82 May18.72.1×
SeonghwanChungcheongnam-do, South Korea1 43.32 May21.02.1×
JangheungJeollanam-do, South Korea1 27.62 May13.42.1×
CheonanChungcheongnam-do, South Korea1 33.02 May16.12.0×
MasanGwangju, South Korea1 31.72 May15.52.0×
GwangjuGwangju, South Korea1 27.92 May13.72.0×
Icheon-siGyeonggi-do, South Korea1 37.02 May18.22.0×

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 19 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, May 2026: 57 cities with PM2.5 at twice their usual or more, 2 May 2026, smogrank.com/episodes/2026-05-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.