SmogRank / Episodes / South Korea

South Korea, 9 to 11 March 2025

For 3 days, from 9 to 11 March 2025, 38 cities in South Korea had PM2.5 at least twice their usual for the time of year. The worst reading was Seonghwan, Chungcheongnam-do, South Korea: 62.4 µg/m³ on 10 March, about 2.5× its usual 24.9.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached38in 1 country
Days39 to 11 March 2025
Worst day10 March34 cities counted
Furthest above usual2.9×Anseong

Day by day

10 March 34 cities at twice their usual or more
GongjuNonsanDaejeonYŏnmuChinch'ŏnOkcheonIksanNamsaKinzanGunsanTaesal-liWanjuJeonjuKimjeKoesanYeongdongJinan-gunBuanYeojuJeongeupImsilChungjuChangsuHwadoSangjuKoch'angMungyeongGimcheonWŏnjuNangenDamyangJangseongGanghwa-gunGapyeongGumiGwangjuHongch’ŏnKuryeYecheonMasanChuncheonWaegwanHwasunNajuNeietsuKunwiYeongjuCheorwonMuanHwawŏnHadongSuncheonHwacheonKwangyangAndongDaeguChinjuBeolgyoGwangyangYeongamBoseongChangnyeongYangguMokpoGyeongsan-siJangheungHayangYeosuSinanNaesŏEisenMiryangHaenamCheongsong gunGoseongT’aebaekChangwonGangneungTongyeongJumunjinSokchoKimhaeDonghae CityGyeongjuKosongSantyokuSinhyeonYangsanYeonilPohangGeojeUngsangBusanUlsanGijangTsushimaNagatoMineHagiYamaguchiYeonggwangNamyangjuJungpyongYangp'yŏngCheongju-siWabuBoryeongPubalSeosanSejongHongseongIcheon-siYesanHwaseong-siAsanTangjinYangjuGuri-siMunsanGimpo-siUijeongbu-siCheonanSeoulSeonghwanBuyeoHanamGwangjuOsanPyeongtaekAnsan-siBucheon-siIncheonGoyang-siSeongnam-siAnyang-siGwangmyeongSuwonAnseong
6 Mar7891011121314
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

PyeongtaekPyeongtaek, 6 March: 28.3 µg/m³Pyeongtaek, 7 March: 43.6 µg/m³Pyeongtaek, 8 March: 41.0 µg/m³Pyeongtaek, 9 March: 46.8 µg/m³, 2.2× its usual 21.3Pyeongtaek, 10 March: 56.1 µg/m³, 2.6× its usual 21.3Pyeongtaek, 11 March: 42.8 µg/m³Pyeongtaek, 12 March: 39.6 µg/m³Pyeongtaek, 13 March: 32.8 µg/m³Pyeongtaek, 14 March: 24.5 µg/m³Bucheon-siBucheon-si, 6 March: 27.0 µg/m³Bucheon-si, 7 March: 43.8 µg/m³Bucheon-si, 8 March: 37.3 µg/m³Bucheon-si, 9 March: 45.8 µg/m³, 2.0× its usual 22.8Bucheon-si, 10 March: 58.5 µg/m³, 2.6× its usual 22.5Bucheon-si, 11 March: 48.5 µg/m³, 2.1× its usual 23.3Bucheon-si, 12 March: 33.6 µg/m³Bucheon-si, 13 March: 28.1 µg/m³Bucheon-si, 14 March: 20.9 µg/m³OsanOsan, 6 March: 27.8 µg/m³Osan, 7 March: 47.9 µg/m³Osan, 8 March: 43.4 µg/m³Osan, 9 March: 44.4 µg/m³, 2.1× its usual 20.7Osan, 10 March: 53.0 µg/m³, 2.6× its usual 20.5Osan, 11 March: 42.5 µg/m³Osan, 12 March: 40.6 µg/m³Osan, 13 March: 33.4 µg/m³Osan, 14 March: 24.1 µg/m³GwangmyeongGwangmyeong, 6 March: 28.5 µg/m³Gwangmyeong, 7 March: 49.2 µg/m³Gwangmyeong, 8 March: 41.5 µg/m³Gwangmyeong, 9 March: 43.7 µg/m³, 2.0× its usual 21.4Gwangmyeong, 10 March: 58.3 µg/m³, 2.8× its usual 21.0Gwangmyeong, 11 March: 45.0 µg/m³, 2.1× its usual 21.0Gwangmyeong, 12 March: 31.4 µg/m³Gwangmyeong, 13 March: 32.8 µg/m³Gwangmyeong, 14 March: 21.5 µg/m³AnseongAnseong, 6 March: 26.5 µg/m³Anseong, 7 March: 42.4 µg/m³Anseong, 8 March: 40.3 µg/m³Anseong, 9 March: 40.2 µg/m³, 2.1× its usual 19.3Anseong, 10 March: 54.5 µg/m³, 2.9× its usual 18.8Anseong, 11 March: 46.5 µg/m³, 2.3× its usual 19.9Anseong, 12 March: 41.6 µg/m³Anseong, 13 March: 34.6 µg/m³Anseong, 14 March: 22.3 µg/m³SeosanSeosan, 6 March: 25.4 µg/m³Seosan, 7 March: 33.8 µg/m³Seosan, 8 March: 31.7 µg/m³Seosan, 9 March: 39.9 µg/m³, 2.1× its usual 19.3Seosan, 10 March: 41.2 µg/m³, 2.2× its usual 19.1Seosan, 11 March: 28.0 µg/m³Seosan, 12 March: 30.2 µg/m³Seosan, 13 March: 19.0 µg/m³Seosan, 14 March: 21.6 µg/m³BuyeoBuyeo, 6 March: 21.8 µg/m³Buyeo, 7 March: 34.5 µg/m³Buyeo, 8 March: 29.5 µg/m³Buyeo, 9 March: 35.9 µg/m³, 2.1× its usual 16.7Buyeo, 10 March: 42.8 µg/m³, 2.6× its usual 16.6Buyeo, 11 March: 34.6 µg/m³, 2.1× its usual 16.8Buyeo, 12 March: no readingBuyeo, 13 March: 23.4 µg/m³Buyeo, 14 March: 22.8 µg/m³YeonggwangYeonggwang, 6 March: 20.5 µg/m³Yeonggwang, 7 March: 27.3 µg/m³Yeonggwang, 8 March: 18.8 µg/m³Yeonggwang, 9 March: 32.5 µg/m³, 2.0× its usual 16.0Yeonggwang, 10 March: 31.2 µg/m³Yeonggwang, 11 March: 28.6 µg/m³Yeonggwang, 12 March: 24.6 µg/m³Yeonggwang, 13 March: 25.8 µg/m³Yeonggwang, 14 March: 23.6 µg/m³SeonghwanSeonghwan, 6 March: 35.5 µg/m³Seonghwan, 7 March: 48.1 µg/m³Seonghwan, 8 March: 46.8 µg/m³Seonghwan, 9 March: 49.8 µg/m³Seonghwan, 10 March: 62.4 µg/m³, 2.5× its usual 24.9Seonghwan, 11 March: 49.8 µg/m³Seonghwan, 12 March: 37.5 µg/m³Seonghwan, 13 March: 41.6 µg/m³Seonghwan, 14 March: 29.3 µg/m³IncheonIncheon, 6 March: 30.2 µg/m³Incheon, 7 March: 44.8 µg/m³Incheon, 8 March: 35.0 µg/m³Incheon, 9 March: 39.7 µg/m³Incheon, 10 March: 60.4 µg/m³, 2.6× its usual 23.3Incheon, 11 March: 53.1 µg/m³, 2.2× its usual 24.3Incheon, 12 March: 32.7 µg/m³Incheon, 13 March: 29.3 µg/m³Incheon, 14 March: 21.2 µg/m³SuwonSuwon, 6 March: 28.0 µg/m³Suwon, 7 March: 45.0 µg/m³Suwon, 8 March: 40.2 µg/m³Suwon, 9 March: 42.8 µg/m³Suwon, 10 March: 59.1 µg/m³, 2.8× its usual 21.4Suwon, 11 March: 47.6 µg/m³, 2.2× its usual 21.4Suwon, 12 March: 39.6 µg/m³Suwon, 13 March: 32.2 µg/m³Suwon, 14 March: 20.6 µg/m³Anyang-siAnyang-si, 6 March: 26.9 µg/m³Anyang-si, 7 March: 45.6 µg/m³Anyang-si, 8 March: 39.2 µg/m³Anyang-si, 9 March: 42.1 µg/m³Anyang-si, 10 March: 57.4 µg/m³, 2.8× its usual 20.6Anyang-si, 11 March: 44.1 µg/m³, 2.1× its usual 20.6Anyang-si, 12 March: 34.1 µg/m³Anyang-si, 13 March: 27.8 µg/m³Anyang-si, 14 March: 18.9 µg/m³Ansan-siAnsan-si, 6 March: 29.6 µg/m³Ansan-si, 7 March: 44.1 µg/m³Ansan-si, 8 March: 35.8 µg/m³Ansan-si, 9 March: 39.6 µg/m³Ansan-si, 10 March: 57.3 µg/m³, 2.6× its usual 22.0Ansan-si, 11 March: 43.5 µg/m³Ansan-si, 12 March: 41.7 µg/m³Ansan-si, 13 March: 32.8 µg/m³Ansan-si, 14 March: 19.5 µg/m³Goyang-siGoyang-si, 6 March: 27.0 µg/m³Goyang-si, 7 March: 45.0 µg/m³Goyang-si, 8 March: 38.0 µg/m³Goyang-si, 9 March: 36.3 µg/m³Goyang-si, 10 March: 56.3 µg/m³, 2.7× its usual 21.1Goyang-si, 11 March: 48.2 µg/m³, 2.2× its usual 21.8Goyang-si, 12 March: 28.6 µg/m³Goyang-si, 13 March: 23.2 µg/m³Goyang-si, 14 March: 20.2 µg/m³YesanYesan, 6 March: 28.8 µg/m³Yesan, 7 March: 41.5 µg/m³Yesan, 8 March: 36.8 µg/m³Yesan, 9 March: 45.7 µg/m³Yesan, 10 March: 54.8 µg/m³, 2.2× its usual 24.4Yesan, 11 March: 34.0 µg/m³Yesan, 12 March: 29.6 µg/m³Yesan, 13 March: 30.4 µg/m³Yesan, 14 March: 27.5 µg/m³TangjinTangjin, 6 March: 29.0 µg/m³Tangjin, 7 March: 37.5 µg/m³Tangjin, 8 March: 35.6 µg/m³Tangjin, 9 March: 43.7 µg/m³Tangjin, 10 March: 54.4 µg/m³, 2.3× its usual 23.6Tangjin, 11 March: 39.4 µg/m³Tangjin, 12 March: 33.3 µg/m³Tangjin, 13 March: 33.6 µg/m³Tangjin, 14 March: 23.1 µg/m³Gimpo-siGimpo-si, 6 March: 29.9 µg/m³Gimpo-si, 7 March: 45.2 µg/m³Gimpo-si, 8 March: 35.7 µg/m³Gimpo-si, 9 March: 35.7 µg/m³Gimpo-si, 10 March: 54.2 µg/m³, 2.4× its usual 22.8Gimpo-si, 11 March: 47.0 µg/m³Gimpo-si, 12 March: 31.5 µg/m³Gimpo-si, 13 March: 25.2 µg/m³Gimpo-si, 14 March: 22.9 µg/m³Seongnam-siSeongnam-si, 6 March: 23.2 µg/m³Seongnam-si, 7 March: 40.5 µg/m³Seongnam-si, 8 March: 32.8 µg/m³Seongnam-si, 9 March: 38.6 µg/m³Seongnam-si, 10 March: 54.1 µg/m³, 2.8× its usual 19.4Seongnam-si, 11 March: 42.4 µg/m³, 2.1× its usual 19.8Seongnam-si, 12 March: 34.1 µg/m³Seongnam-si, 13 March: 27.8 µg/m³Seongnam-si, 14 March: 18.1 µg/m³SeoulSeoul, 6 March: 27.4 µg/m³Seoul, 7 March: 47.1 µg/m³Seoul, 8 March: 37.3 µg/m³Seoul, 9 March: 37.9 µg/m³Seoul, 10 March: 54.1 µg/m³, 2.5× its usual 21.3Seoul, 11 March: 45.0 µg/m³, 2.1× its usual 21.7Seoul, 12 March: 28.9 µg/m³Seoul, 13 March: 29.3 µg/m³Seoul, 14 March: 20.9 µg/m³AsanAsan, 6 March: 27.5 µg/m³Asan, 7 March: 39.0 µg/m³Asan, 8 March: 35.6 µg/m³Asan, 9 March: 43.3 µg/m³Asan, 10 March: 54.0 µg/m³, 2.3× its usual 23.3Asan, 11 March: 41.9 µg/m³Asan, 12 March: 29.0 µg/m³Asan, 13 March: 46.3 µg/m³Asan, 14 March: 26.3 µg/m³GwangjuGwangju, 6 March: 21.2 µg/m³Gwangju, 7 March: 42.8 µg/m³Gwangju, 8 March: 35.9 µg/m³Gwangju, 9 March: 40.9 µg/m³Gwangju, 10 March: 52.9 µg/m³, 2.6× its usual 20.5Gwangju, 11 March: 46.9 µg/m³, 2.3× its usual 20.8Gwangju, 12 March: 42.8 µg/m³Gwangju, 13 March: 23.9 µg/m³Gwangju, 14 March: 20.2 µg/m³HanamHanam, 6 March: 21.3 µg/m³Hanam, 7 March: 42.6 µg/m³Hanam, 8 March: 32.5 µg/m³Hanam, 9 March: 37.2 µg/m³Hanam, 10 March: 52.8 µg/m³, 2.6× its usual 20.2Hanam, 11 March: 43.5 µg/m³, 2.1× its usual 20.5Hanam, 12 March: 33.2 µg/m³Hanam, 13 March: 29.7 µg/m³Hanam, 14 March: 20.7 µg/m³MunsanMunsan, 6 March: 28.4 µg/m³Munsan, 7 March: 46.7 µg/m³Munsan, 8 March: 34.5 µg/m³Munsan, 9 March: 34.9 µg/m³Munsan, 10 March: 52.8 µg/m³, 2.4× its usual 22.1Munsan, 11 March: 39.3 µg/m³Munsan, 12 March: 28.9 µg/m³Munsan, 13 March: 18.7 µg/m³Munsan, 14 March: 20.8 µg/m³Hwaseong-siHwaseong-si, 6 March: 25.5 µg/m³Hwaseong-si, 7 March: 38.5 µg/m³Hwaseong-si, 8 March: 36.0 µg/m³Hwaseong-si, 9 March: 40.2 µg/m³Hwaseong-si, 10 March: 52.2 µg/m³, 2.3× its usual 22.7Hwaseong-si, 11 March: 37.8 µg/m³Hwaseong-si, 12 March: 35.2 µg/m³Hwaseong-si, 13 March: 26.9 µg/m³Hwaseong-si, 14 March: 18.5 µg/m³CheonanCheonan, 6 March: 25.7 µg/m³Cheonan, 7 March: 38.9 µg/m³Cheonan, 8 March: 33.8 µg/m³Cheonan, 9 March: 40.6 µg/m³Cheonan, 10 March: 50.8 µg/m³, 2.5× its usual 20.3Cheonan, 11 March: 39.2 µg/m³Cheonan, 12 March: 30.2 µg/m³Cheonan, 13 March: 38.5 µg/m³Cheonan, 14 March: 24.7 µg/m³HongseongHongseong, 6 March: 26.0 µg/m³Hongseong, 7 March: 37.3 µg/m³Hongseong, 8 March: 33.1 µg/m³Hongseong, 9 March: 45.0 µg/m³Hongseong, 10 March: 49.7 µg/m³, 2.2× its usual 23.0Hongseong, 11 March: 36.9 µg/m³Hongseong, 12 March: 34.6 µg/m³Hongseong, 13 March: 25.7 µg/m³Hongseong, 14 March: 26.4 µg/m³Uijeongbu-siUijeongbu-si, 6 March: 23.8 µg/m³Uijeongbu-si, 7 March: 42.8 µg/m³Uijeongbu-si, 8 March: 35.2 µg/m³Uijeongbu-si, 9 March: 32.6 µg/m³Uijeongbu-si, 10 March: 48.7 µg/m³, 2.5× its usual 19.6Uijeongbu-si, 11 March: 37.6 µg/m³Uijeongbu-si, 12 March: 24.8 µg/m³Uijeongbu-si, 13 March: 18.7 µg/m³Uijeongbu-si, 14 March: 18.9 µg/m³Guri-siGuri-si, 6 March: 26.2 µg/m³Guri-si, 7 March: 47.5 µg/m³Guri-si, 8 March: 37.4 µg/m³Guri-si, 9 March: 35.9 µg/m³Guri-si, 10 March: 48.2 µg/m³, 2.4× its usual 20.5Guri-si, 11 March: 42.0 µg/m³, 2.0× its usual 20.7Guri-si, 12 March: 27.8 µg/m³Guri-si, 13 March: 23.7 µg/m³Guri-si, 14 March: 20.1 µg/m³Icheon-siIcheon-si, 6 March: 20.0 µg/m³Icheon-si, 7 March: 44.7 µg/m³Icheon-si, 8 March: 34.0 µg/m³Icheon-si, 9 March: 39.5 µg/m³Icheon-si, 10 March: 47.1 µg/m³, 2.2× its usual 21.6Icheon-si, 11 March: 50.1 µg/m³, 2.2× its usual 23.3Icheon-si, 12 March: 47.2 µg/m³Icheon-si, 13 March: 28.1 µg/m³Icheon-si, 14 March: 22.6 µg/m³SejongSejong, 6 March: 23.0 µg/m³Sejong, 7 March: 38.7 µg/m³Sejong, 8 March: 36.2 µg/m³Sejong, 9 March: 37.9 µg/m³Sejong, 10 March: 46.8 µg/m³, 2.2× its usual 21.0Sejong, 11 March: 44.4 µg/m³, 2.1× its usual 21.3Sejong, 12 March: 33.0 µg/m³Sejong, 13 March: 30.9 µg/m³Sejong, 14 March: 19.5 µg/m³Yangp'yŏngYangp'yŏng, 6 March: 14.6 µg/m³Yangp'yŏng, 7 March: 38.6 µg/m³Yangp'yŏng, 8 March: 37.3 µg/m³Yangp'yŏng, 9 March: 35.0 µg/m³Yangp'yŏng, 10 March: 45.2 µg/m³, 2.0× its usual 22.2Yangp'yŏng, 11 March: 42.2 µg/m³Yangp'yŏng, 12 March: 42.6 µg/m³Yangp'yŏng, 13 March: 22.9 µg/m³Yangp'yŏng, 14 March: 21.0 µg/m³BoryeongBoryeong, 6 March: 27.9 µg/m³Boryeong, 7 March: 38.1 µg/m³Boryeong, 8 March: 31.9 µg/m³Boryeong, 9 March: 36.8 µg/m³Boryeong, 10 March: 42.8 µg/m³, 2.1× its usual 20.7Boryeong, 11 March: 38.6 µg/m³Boryeong, 12 March: 45.1 µg/m³Boryeong, 13 March: 23.8 µg/m³Boryeong, 14 March: 24.0 µg/m³YangjuYangju, 6 March: 21.2 µg/m³Yangju, 7 March: 43.0 µg/m³Yangju, 8 March: 33.3 µg/m³Yangju, 9 March: 29.8 µg/m³Yangju, 10 March: 42.5 µg/m³, 2.4× its usual 18.0Yangju, 11 March: 36.2 µg/m³Yangju, 12 March: 27.9 µg/m³Yangju, 13 March: 22.4 µg/m³Yangju, 14 March: 20.1 µg/m³NamyangjuNamyangju, 6 March: 22.3 µg/m³Namyangju, 7 March: 41.5 µg/m³Namyangju, 8 March: 34.4 µg/m³Namyangju, 9 March: 28.5 µg/m³Namyangju, 10 March: 40.2 µg/m³, 2.0× its usual 20.1Namyangju, 11 March: 34.2 µg/m³Namyangju, 12 March: 27.7 µg/m³Namyangju, 13 March: 16.5 µg/m³Namyangju, 14 March: 18.0 µg/m³WabuWabu, 6 March: 16.7 µg/m³Wabu, 7 March: 37.2 µg/m³Wabu, 8 March: 31.0 µg/m³Wabu, 9 March: 27.4 µg/m³Wabu, 10 March: 39.9 µg/m³, 2.1× its usual 18.7Wabu, 11 March: 37.5 µg/m³Wabu, 12 March: 26.5 µg/m³Wabu, 13 March: 17.5 µg/m³Wabu, 14 March: 13.1 µg/m³PubalPubal, 6 March: 26.5 µg/m³Pubal, 7 March: 51.0 µg/m³Pubal, 8 March: 38.9 µg/m³Pubal, 9 March: 45.0 µg/m³Pubal, 10 March: 53.4 µg/m³Pubal, 11 March: 56.5 µg/m³, 2.1× its usual 27.0Pubal, 12 March: 51.0 µg/m³Pubal, 13 March: 30.7 µg/m³Pubal, 14 March: 32.3 µg/m³Cheongju-siCheongju-si, 6 March: 24.0 µg/m³Cheongju-si, 7 March: 40.8 µg/m³Cheongju-si, 8 March: 34.7 µg/m³Cheongju-si, 9 March: 34.6 µg/m³Cheongju-si, 10 March: 37.6 µg/m³Cheongju-si, 11 March: 45.3 µg/m³, 2.0× its usual 22.2Cheongju-si, 12 March: 36.8 µg/m³Cheongju-si, 13 March: 38.7 µg/m³Cheongju-si, 14 March: 23.9 µg/m³JungpyongJungpyong, 6 March: 25.3 µg/m³Jungpyong, 7 March: 43.4 µg/m³Jungpyong, 8 March: 30.5 µg/m³Jungpyong, 9 March: 32.8 µg/m³Jungpyong, 10 March: 36.9 µg/m³Jungpyong, 11 March: 44.4 µg/m³, 2.0× its usual 22.2Jungpyong, 12 March: 43.8 µg/m³Jungpyong, 13 March: 32.5 µg/m³Jungpyong, 14 March: 22.1 µg/m³6 Mar7891011121314
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
AnseongGyeonggi-do, South Korea3 54.510 March18.82.9×
SuwonGyeonggi-do, South Korea2 59.110 March21.42.8×
GwangmyeongGyeonggi-do, South Korea3 58.310 March21.02.8×
Anyang-siGyeonggi-do, South Korea2 57.410 March20.62.8×
Seongnam-siGyeonggi-do, South Korea2 54.110 March19.42.8×
Goyang-siGyeonggi-do, South Korea2 56.310 March21.12.7×
IncheonIncheon, South Korea2 60.410 March23.32.6×
Bucheon-siGyeonggi-do, South Korea3 58.510 March22.52.6×
Ansan-siGyeonggi-do, South Korea1 57.310 March22.02.6×
PyeongtaekGyeonggi-do, South Korea2 56.110 March21.32.6×
OsanGyeonggi-do, South Korea2 53.010 March20.52.6×
GwangjuGyeonggi-do, South Korea2 52.910 March20.52.6×
HanamGyeonggi-do, South Korea2 52.810 March20.22.6×
BuyeoChungcheongnam-do, South Korea3 42.810 March16.62.6×
SeonghwanChungcheongnam-do, South Korea1 62.410 March24.92.5×
SeoulSeoul, South Korea2 54.110 March21.32.5×
CheonanChungcheongnam-do, South Korea1 50.810 March20.32.5×
Uijeongbu-siGyeonggi-do, South Korea1 48.710 March19.62.5×
Gimpo-siGyeonggi-do, South Korea1 54.210 March22.82.4×
MunsanGyeonggi-do, South Korea1 52.810 March22.12.4×
Guri-siGyeonggi-do, South Korea2 48.210 March20.52.4×
YangjuGyeonggi-do, South Korea1 42.510 March18.02.4×
TangjinChungcheongnam-do, South Korea1 54.410 March23.62.3×
AsanChungcheongnam-do, South Korea1 54.010 March23.32.3×
Hwaseong-siGyeonggi-do, South Korea1 52.210 March22.72.3×
YesanChungcheongnam-do, South Korea1 54.810 March24.42.2×
Icheon-siGyeonggi-do, South Korea2 50.111 March23.32.2×
HongseongChungcheongnam-do, South Korea1 49.710 March23.02.2×
SejongSejong-si, South Korea2 46.810 March21.02.2×
SeosanChungcheongnam-do, South Korea2 41.210 March19.12.2×
PubalGyeonggi-do, South Korea1 56.511 March27.02.1×
BoryeongChungcheongnam-do, South Korea1 42.810 March20.72.1×
WabuGyeonggi-do, South Korea1 39.910 March18.72.1×
Cheongju-siNorth Chungcheong, South Korea1 45.311 March22.22.0×
Yangp'yŏngGyeonggi-do, South Korea1 45.210 March22.22.0×
JungpyongNorth Chungcheong, South Korea1 44.411 March22.22.0×
NamyangjuGyeonggi-do, South Korea1 40.210 March20.12.0×
YeonggwangJeollanam-do, South Korea1 32.59 March16.02.0×

Daily means in µg/m³, over the days each city counted in this episode. Highest: its highest of those days. Usual: the city's median for the time of year of that day (its days within 21 days of the date, every year, leaving out the week around it). Above usual: its highest day against that, with a usual under 5 µg/m³ taken as 5.

Against other episodes in South Korea

Number 33 of 63 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 63.

Use this page

SmogRank, South Korea, 9 to 11 March 2025: 38 cities with PM2.5 at twice their usual or more, 9 to 11 March 2025, smogrank.com/episodes/2025-03-09-south-korea (accessed 4 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.