SmogRank / Episodes / South Korea

South Korea, April 2024

For 2 days, from 26 to 27 April 2024, 15 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: 52.7 µg/m³ on 26 April, about 2.5× its usual 21.4.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached15in 1 country
Days226 to 27 April 2024
Worst day26 April12 cities counted
Furthest above usual2.7×Taesal-li

Day by day

26 April 12 cities at twice their usual or more
OkcheonYeongdongDaejeonKinzanSejongSangjuKoesanGimcheonMungyeongGongjuJinan-gunNonsanYŏnmuChungjuGumiChangsuWanjuJeonjuNamsaBuyeoWaegwanYecheonIksanImsilKunwiYesanYeojuPubalIcheon-siKimjeHwawŏnNangenDaeguWŏnjuGunsanYeongjuAndongHongseongJeongeupBoryeongChangnyeongBuanNeietsuGwangjuKuryeYangp'yŏngSuwonGyeongsan-siHayangChinjuSeongnam-siHwaseong-siDamyangHadongHanamAnyang-siSeosanWabuKoch'angMiryangHongch’ŏnHwadoCheongsong gunGuri-siNaesŏKwangyangNamyangjuJangseongGwangmyeongGwangyangSuncheonSeoulGwangjuHwasunBucheon-siMasanChangwonGapyeongGoseongChuncheonBeolgyoUijeongbu-siT’aebaekGoyang-siYeosuYeonggwangGyeongjuGimpo-siYangjuNajuYeonilTongyeongYangsanBoseongPohangSinhyeonUngsangHwacheonMunsanYangguUlsanMuanBusanGeojeGangneungYeongamSantyokuJangheungGanghwa-gunDonghae CityGijangJumunjinCheorwonMokpoSokchoHaenamKosongSinanTsushimaNagatoShimonosekiMineHagiOnodaUbeYamaguchiMasudaHōfuHamadaShūnanGōtsuchōKudamatsuHikariŌdachō-ōdaŌtakeYanaiIwakuniYaeHiroshimaKureHigashihiroshimaCheongju-siIncheonKimhaeEisenCheonanAnsan-siAnseongJungpyongAsanOsanTangjinChinch'ŏnPyeongtaekSeonghwanTaesal-li
23 Apr24252627282930
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

SeonghwanSeonghwan, 23 April: 21.0 µg/m³, 1.0× usualSeonghwan, 24 April: 16.5 µg/m³, 0.8× usualSeonghwan, 25 April: 23.0 µg/m³, 1.1× usualSeonghwan, 26 April: 52.7 µg/m³, 2.5× usualSeonghwan, 27 April: 41.8 µg/m³, 2.0× usualSeonghwan, 28 April: 18.3 µg/m³, 0.9× usualSeonghwan, 29 April: 26.2 µg/m³, 1.2× usualSeonghwan, 30 April: 38.9 µg/m³, 1.8× usualTangjinTangjin, 23 April: 21.5 µg/m³, 1.1× usualTangjin, 24 April: 18.2 µg/m³, 0.9× usualTangjin, 25 April: 21.8 µg/m³, 1.1× usualTangjin, 26 April: 45.0 µg/m³, 2.3× usualTangjin, 27 April: 27.9 µg/m³, 1.4× usualTangjin, 28 April: 25.7 µg/m³, 1.3× usualTangjin, 29 April: 27.5 µg/m³, 1.4× usualTangjin, 30 April: 34.9 µg/m³, 1.8× usualPyeongtaekPyeongtaek, 23 April: 14.1 µg/m³, 0.8× usualPyeongtaek, 24 April: 13.8 µg/m³, 0.8× usualPyeongtaek, 25 April: 23.5 µg/m³, 1.3× usualPyeongtaek, 26 April: 44.8 µg/m³, 2.4× usualPyeongtaek, 27 April: 41.5 µg/m³, 2.3× usualPyeongtaek, 28 April: 17.3 µg/m³, 0.9× usualPyeongtaek, 29 April: 21.2 µg/m³, 1.2× usualPyeongtaek, 30 April: 34.9 µg/m³, 1.9× usualAsanAsan, 23 April: 16.3 µg/m³, 0.9× usualAsan, 24 April: 15.0 µg/m³, 0.8× usualAsan, 25 April: 18.9 µg/m³, 1.0× usualAsan, 26 April: 41.1 µg/m³, 2.2× usualAsan, 27 April: 24.9 µg/m³, 1.3× usualAsan, 28 April: 15.4 µg/m³, 0.8× usualAsan, 29 April: 24.0 µg/m³, 1.3× usualAsan, 30 April: 30.8 µg/m³, 1.6× usualOsanOsan, 23 April: 13.8 µg/m³, 0.8× usualOsan, 24 April: 8.6 µg/m³, 0.5× usualOsan, 25 April: 27.2 µg/m³, 1.6× usualOsan, 26 April: 39.5 µg/m³, 2.3× usualOsan, 27 April: 32.2 µg/m³, 1.9× usualOsan, 28 April: 13.3 µg/m³, 0.8× usualOsan, 29 April: 18.1 µg/m³, 1.1× usualOsan, 30 April: 32.1 µg/m³, 1.9× usualAnsan-siAnsan-si, 23 April: 15.9 µg/m³, 0.9× usualAnsan-si, 24 April: 10.4 µg/m³, 0.6× usualAnsan-si, 25 April: 25.0 µg/m³, 1.5× usualAnsan-si, 26 April: 37.9 µg/m³, 2.2× usualAnsan-si, 27 April: 25.0 µg/m³, 1.5× usualAnsan-si, 28 April: 18.9 µg/m³, 1.1× usualAnsan-si, 29 April: 22.3 µg/m³, 1.3× usualAnsan-si, 30 April: 33.7 µg/m³, 2.0× usualChinch'ŏnChinch'ŏn, 23 April: 13.4 µg/m³, 0.9× usualChinch'ŏn, 24 April: 9.8 µg/m³, 0.6× usualChinch'ŏn, 25 April: 16.8 µg/m³, 1.1× usualChinch'ŏn, 26 April: 37.0 µg/m³, 2.4× usualChinch'ŏn, 27 April: 26.3 µg/m³, 1.7× usualChinch'ŏn, 28 April: 14.6 µg/m³, 0.9× usualChinch'ŏn, 29 April: 20.8 µg/m³, 1.3× usualChinch'ŏn, 30 April: 26.2 µg/m³, 1.7× usualIncheonIncheon, 23 April: 17.2 µg/m³, 1.0× usualIncheon, 24 April: 10.9 µg/m³, 0.6× usualIncheon, 25 April: 22.5 µg/m³, 1.3× usualIncheon, 26 April: 36.3 µg/m³, 2.0× usualIncheon, 27 April: 22.9 µg/m³, 1.3× usualIncheon, 28 April: 22.8 µg/m³, 1.3× usualIncheon, 29 April: 23.6 µg/m³, 1.3× usualIncheon, 30 April: 32.6 µg/m³, 1.8× usualCheonanCheonan, 23 April: 12.6 µg/m³, 0.7× usualCheonan, 24 April: 8.1 µg/m³, 0.5× usualCheonan, 25 April: 13.4 µg/m³, 0.8× usualCheonan, 26 April: 35.5 µg/m³, 2.1× usualCheonan, 27 April: 31.1 µg/m³, 1.8× usualCheonan, 28 April: 13.8 µg/m³, 0.8× usualCheonan, 29 April: 21.8 µg/m³, 1.3× usualCheonan, 30 April: 23.0 µg/m³, 1.4× usualTaesal-liTaesal-li, 23 April: 12.2 µg/m³, 1.0× usualTaesal-li, 24 April: 8.7 µg/m³, 0.7× usualTaesal-li, 25 April: 9.4 µg/m³, 0.7× usualTaesal-li, 26 April: 34.1 µg/m³, 2.7× usualTaesal-li, 27 April: 9.2 µg/m³, 0.7× usualTaesal-li, 28 April: 15.7 µg/m³, 1.2× usualTaesal-li, 29 April: 17.1 µg/m³, 1.4× usualTaesal-li, 30 April: 19.1 µg/m³, 1.5× usualAnseongAnseong, 23 April: 10.9 µg/m³, 0.7× usualAnseong, 24 April: 9.4 µg/m³, 0.6× usualAnseong, 25 April: 18.3 µg/m³, 1.2× usualAnseong, 26 April: 33.1 µg/m³, 2.2× usualAnseong, 27 April: 33.1 µg/m³, 2.2× usualAnseong, 28 April: 10.5 µg/m³, 0.7× usualAnseong, 29 April: 15.0 µg/m³, 1.0× usualAnseong, 30 April: 28.0 µg/m³, 1.9× usualJungpyongJungpyong, 23 April: 13.2 µg/m³, 0.9× usualJungpyong, 24 April: 11.0 µg/m³, 0.8× usualJungpyong, 25 April: 16.0 µg/m³, 1.1× usualJungpyong, 26 April: 31.0 µg/m³, 2.2× usualJungpyong, 27 April: 29.6 µg/m³, 2.1× usualJungpyong, 28 April: 14.2 µg/m³, 1.0× usualJungpyong, 29 April: 19.2 µg/m³, 1.4× usualJungpyong, 30 April: 22.5 µg/m³, 1.6× usualKimhaeKimhae, 23 April: 11.7 µg/m³, 0.9× usualKimhae, 24 April: 9.4 µg/m³, 0.7× usualKimhae, 25 April: 12.0 µg/m³, 0.9× usualKimhae, 26 April: 20.5 µg/m³, 1.5× usualKimhae, 27 April: 28.7 µg/m³, 2.1× usualKimhae, 28 April: 25.8 µg/m³, 1.9× usualKimhae, 29 April: 17.3 µg/m³, 1.3× usualKimhae, 30 April: 14.8 µg/m³, 1.1× usualCheongju-siCheongju-si, 23 April: 9.9 µg/m³, 0.7× usualCheongju-si, 24 April: 8.0 µg/m³, 0.6× usualCheongju-si, 25 April: 13.3 µg/m³, 0.9× usualCheongju-si, 26 April: 25.8 µg/m³, 1.8× usualCheongju-si, 27 April: 28.5 µg/m³, 2.0× usualCheongju-si, 28 April: 12.5 µg/m³, 0.9× usualCheongju-si, 29 April: 18.8 µg/m³, 1.3× usualCheongju-si, 30 April: 18.1 µg/m³, 1.3× usualEisenEisen, 23 April: 8.9 µg/m³, 0.7× usualEisen, 24 April: 8.7 µg/m³, 0.6× usualEisen, 25 April: 16.3 µg/m³, 1.2× usualEisen, 26 April: 23.4 µg/m³, 1.7× usualEisen, 27 April: 28.3 µg/m³, 2.1× usualEisen, 28 April: 27.5 µg/m³, 2.0× usualEisen, 29 April: 16.1 µg/m³, 1.2× usualEisen, 30 April: 15.0 µg/m³, 1.1× usual23 Apr24252627282930
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
Taesal-liChungcheongnam-do, South Korea1 34.126 April12.62.7×
SeonghwanChungcheongnam-do, South Korea2 52.726 April21.42.5×
PyeongtaekGyeonggi-do, South Korea2 44.826 April18.32.4×
Chinch'ŏnNorth Chungcheong, South Korea1 37.026 April15.72.4×
OsanGyeonggi-do, South Korea1 39.526 April17.02.3×
TangjinChungcheongnam-do, South Korea1 45.026 April19.82.3×
AnseongGyeonggi-do, South Korea2 33.126 April15.02.2×
Ansan-siGyeonggi-do, South Korea1 37.926 April17.22.2×
JungpyongNorth Chungcheong, South Korea2 31.026 April14.22.2×
AsanChungcheongnam-do, South Korea1 41.126 April19.02.2×
KimhaeGyeongsangnam-do, South Korea1 28.727 April13.42.1×
CheonanChungcheongnam-do, South Korea1 35.526 April16.92.1×
EisenGyeongsangbuk-do, South Korea1 28.327 April13.62.1×
IncheonIncheon, South Korea1 36.326 April17.82.0×
Cheongju-siNorth Chungcheong, South Korea1 28.527 April14.12.0×

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 54 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, April 2024: 15 cities with PM2.5 at twice their usual or more, 26 to 27 April 2024, smogrank.com/episodes/2024-04-south-korea-2 (accessed 3 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.