SmogRank / Episodes / South Korea

Gyeonggi-do and Chungcheongnam-do, South Korea, October 2024

For 1 day, on 28 October 2024, 10 cities in South Korea had PM2.5 at least twice their usual for the time of year. The worst reading was Incheon, Incheon, South Korea: 35.6 µg/m³ on 28 October, about 2.7× its usual 13.3.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached10in 1 country
Days128 October 2024
Worst day28 October10 cities counted
Furthest above usual2.7×Bucheon-si

Day by day

28 October 10 cities at twice their usual or more
HongseongYesanBoryeongBuyeoAsanGongjuSeosanCheonanNonsanSeonghwanSejongYŏnmuGunsanIksanDaejeonNamsaOsanAnseongCheongju-siChinch'ŏnKimjeSuwonWanjuJeonjuBuanOkcheonKinzanJungpyongAnyang-siGwangmyeongJeongeupSeongnam-siGwangjuIcheon-siJinan-gunSeoulPubalKoesanImsilYeongdongHanamGuri-siWabuYeojuChangsuNamyangjuYangp'yŏngUijeongbu-siHwadoChungjuGanghwa-gunDamyangJangseongNangenYeonggwangMunsanYangjuSangjuGwangjuGimcheonMasanWŏnjuMungyeongGapyeongHwasunKuryeNajuMuanHongch’ŏnGumiChuncheonYecheonWaegwanCheorwonYeongamSuncheonKwangyangHadongMokpoBeolgyoBoseongNeietsuHwacheonKunwiSinanGwangyangJangheungYeongjuHwawŏnChinjuDaeguAndongYangguHaenamYeosuChangnyeongGyeongsan-siHayangNaesŏGoseongEisenMiryangCheongsong gunT’aebaekChangwonTongyeongGangneungJumunjinSokchoKimhaeSinhyeonKosongGyeongjuDonghae CitySantyokuYangsanGeojeYeonilPohangUngsangBusanUlsanGijangTsushimaHwaseong-siPyeongtaekTangjinGoyang-siTaesal-liKoch'angAnsan-siGimpo-siIncheonBucheon-si
25 Oct262728293031
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

IncheonIncheon, 25 October: 19.9 µg/m³, 1.5× usualIncheon, 26 October: 16.8 µg/m³, 1.3× usualIncheon, 27 October: 21.5 µg/m³, 1.6× usualIncheon, 28 October: 35.6 µg/m³, 2.7× usualIncheon, 29 October: 9.7 µg/m³, 0.7× usualIncheon, 30 October: 18.1 µg/m³, 1.4× usualIncheon, 31 October: 27.8 µg/m³, 2.1× usualGimpo-siGimpo-si, 25 October: 21.2 µg/m³, 1.5× usualGimpo-si, 26 October: 18.5 µg/m³, 1.3× usualGimpo-si, 27 October: 25.7 µg/m³, 1.8× usualGimpo-si, 28 October: 34.3 µg/m³, 2.4× usualGimpo-si, 29 October: 9.6 µg/m³, 0.7× usualGimpo-si, 30 October: 20.2 µg/m³, 1.4× usualGimpo-si, 31 October: 28.7 µg/m³, 2.0× usualTangjinTangjin, 25 October: 21.2 µg/m³, 1.3× usualTangjin, 26 October: 17.7 µg/m³, 1.1× usualTangjin, 27 October: 21.9 µg/m³, 1.3× usualTangjin, 28 October: 33.3 µg/m³, 2.0× usualTangjin, 29 October: 11.5 µg/m³, 0.7× usualTangjin, 30 October: 22.3 µg/m³, 1.4× usualTangjin, 31 October: 28.1 µg/m³, 1.7× usualBucheon-siBucheon-si, 25 October: 16.6 µg/m³, 1.4× usualBucheon-si, 26 October: 14.2 µg/m³, 1.2× usualBucheon-si, 27 October: 16.9 µg/m³, 1.4× usualBucheon-si, 28 October: 32.7 µg/m³, 2.7× usualBucheon-si, 29 October: 7.5 µg/m³, 0.6× usualBucheon-si, 30 October: 17.0 µg/m³, 1.4× usualBucheon-si, 31 October: 24.3 µg/m³, 2.0× usualGoyang-siGoyang-si, 25 October: 20.7 µg/m³, 1.6× usualGoyang-si, 26 October: 16.9 µg/m³, 1.3× usualGoyang-si, 27 October: 21.2 µg/m³, 1.6× usualGoyang-si, 28 October: 29.0 µg/m³, 2.2× usualGoyang-si, 29 October: 8.0 µg/m³, 0.6× usualGoyang-si, 30 October: 17.6 µg/m³, 1.3× usualGoyang-si, 31 October: 26.6 µg/m³, 2.0× usualHwaseong-siHwaseong-si, 25 October: 18.1 µg/m³, 1.3× usualHwaseong-si, 26 October: 12.9 µg/m³, 0.9× usualHwaseong-si, 27 October: 19.2 µg/m³, 1.4× usualHwaseong-si, 28 October: 28.9 µg/m³, 2.0× usualHwaseong-si, 29 October: 10.8 µg/m³, 0.8× usualHwaseong-si, 30 October: 21.5 µg/m³, 1.5× usualHwaseong-si, 31 October: 30.2 µg/m³, 2.1× usualKoch'angKoch'ang, 25 October: 15.4 µg/m³, 1.3× usualKoch'ang, 26 October: 9.0 µg/m³, 0.7× usualKoch'ang, 27 October: 14.4 µg/m³, 1.2× usualKoch'ang, 28 October: 27.8 µg/m³, 2.3× usualKoch'ang, 29 October: 18.6 µg/m³, 1.5× usualKoch'ang, 30 October: 16.8 µg/m³, 1.4× usualKoch'ang, 31 October: 22.5 µg/m³, 1.8× usualAnsan-siAnsan-si, 25 October: 14.6 µg/m³, 1.3× usualAnsan-si, 26 October: 11.4 µg/m³, 1.0× usualAnsan-si, 27 October: 17.7 µg/m³, 1.6× usualAnsan-si, 28 October: 27.7 µg/m³, 2.4× usualAnsan-si, 29 October: 8.0 µg/m³, 0.7× usualAnsan-si, 30 October: 17.7 µg/m³, 1.6× usualAnsan-si, 31 October: 24.0 µg/m³, 2.1× usualPyeongtaekPyeongtaek, 25 October: 15.0 µg/m³, 1.2× usualPyeongtaek, 26 October: 11.5 µg/m³, 0.9× usualPyeongtaek, 27 October: 14.3 µg/m³, 1.1× usualPyeongtaek, 28 October: 25.7 µg/m³, 2.0× usualPyeongtaek, 29 October: 8.5 µg/m³, 0.7× usualPyeongtaek, 30 October: 19.9 µg/m³, 1.6× usualPyeongtaek, 31 October: 26.0 µg/m³, 2.1× usualTaesal-liTaesal-li, 25 October: 15.1 µg/m³, 1.3× usualTaesal-li, 26 October: 11.8 µg/m³, 1.0× usualTaesal-li, 27 October: 14.7 µg/m³, 1.3× usualTaesal-li, 28 October: 25.5 µg/m³, 2.2× usualTaesal-li, 29 October: 7.8 µg/m³, 0.7× usualTaesal-li, 30 October: 13.1 µg/m³, 1.1× usualTaesal-li, 31 October: 16.8 µg/m³, 1.4× usual25 Oct262728293031
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
Bucheon-siGyeonggi-do, South Korea1 32.728 October12.12.7×
IncheonIncheon, South Korea1 35.628 October13.32.7×
Ansan-siGyeonggi-do, South Korea1 27.728 October11.42.4×
Gimpo-siGyeonggi-do, South Korea1 34.328 October14.42.4×
Koch'angJeollabuk-do, South Korea1 27.828 October12.22.3×
Goyang-siGyeonggi-do, South Korea1 29.028 October13.32.2×
Taesal-liChungcheongnam-do, South Korea1 25.528 October11.72.2×
Hwaseong-siGyeonggi-do, South Korea1 30.231 October14.12.1×
PyeongtaekGyeonggi-do, South Korea1 26.031 October12.62.1×
TangjinChungcheongnam-do, South Korea1 33.328 October16.42.0×

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 60 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, Gyeonggi-do and Chungcheongnam-do, South Korea, October 2024: 10 cities with PM2.5 at twice their usual or more, 28 October 2024, smogrank.com/episodes/2024-10-gyeonggi-do-and-chungcheongnam-do-south-korea (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.