SmogRank / Episodes / South Korea

South Korea, December 2025

For 5 days, from 16 to 20 December 2025, 107 cities in South Korea had PM2.5 at least twice their usual for the time of year. The worst reading was Hayang, Gyeongsangbuk-do, South Korea: 53.8 µg/m³ on 20 December, about 3.9× its usual 13.9.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached107in 1 country
Days516 to 20 December 2025
Worst day17 December82 cities counted
Furthest above usual4.3×Taesal-li

Day by day

17 December 82 cities at twice their usual or more
NamsaGoseongKimjeBuyeoBeolgyoBuanHwasunYeongjuYangsanUngsangNajuYeojuGijangPubalYeonggwangJangheungMuanYangp'yŏngSeosanT’aebaekSantyokuSinanDonghae CityGangneungTsushimaJumunjinSokchoKosongIkiGaigeturiSeogwipoMatsuuraKaratsuSaseboItoshimaMaebaru-chūōImarichō-kōKogaMunakataFukuokaTakuTakeoKogaUreshinomachi-shimojukuWakasugiKasugaNakamaHigashigōNōgataKanzakimachi-kanzakiSagaIizukaKitakyushuShimonosekiTosuNagatoOgōriTagawaYanagawaChikugoMineKandaTanushimarumachi-toyokiYukuhashiOnodaUkihaYameHagiUbeBuzenYamaguchiHitaNakatsuHōfuMasudaHamadaShūnanKudamatsuYufuGōtsuchōBeppuKunisakiHikariŌitaTsurusakiYanaiŌtakeIwakuniŌdachō-ōdaHiroshimaYaeGionIzumoKureUnnanHigashihiroshimaMiyoshiYawatahamaIyoMatsuyamaUwajimaJungpyongGwangjuBusanWŏnjuHwacheonPohangGanghwa-gunJangseongGwangjuMasanJeongeupNamyangjuHanamSinhyeonJeju CityJeonjuKoesanMokpoNangenWanjuIksanGumiCheongju-siHongch’ŏnNeietsuAndongTongyeongHongseongGunsanUlsanYŏnmuYangguHwadoChinjuDamyangMunsanNonsanYeosuCheonanCheongsong gunChungjuIncheonKoch'angKinzanGuri-siAsanBoryeongYeongdongAnseongBoseongGwangyangGimcheonSuncheonImsilGimpo-siGoyang-siKunwiPyeongtaekSangjuSeonghwanSeoulSuwonDaejeonTangjinUijeongbu-siYesanIcheon-siNaesŏKwangyangYeongamGwangmyeongChangsuJinan-gunHaenamGongjuMiryangYecheonYeonilSeongnam-siAnsan-siAnyang-siKimhaeBucheon-siHwaseong-siOkcheonYangjuHadongChangnyeongChinch'ŏnGyeongjuOsanWaegwanWabuCheorwonChuncheonGeojeSejongChangwonMungyeongHwawŏnGapyeongKuryeDaeguGyeongsan-siEisenHayangTaesal-li
13 Dec14151617181920212223
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

HayangHayang, 13 December: 14.2 µg/m³, 1.0× usualHayang, 14 December: 8.9 µg/m³, 0.6× usualHayang, 15 December: 16.0 µg/m³, 1.2× usualHayang, 16 December: 34.2 µg/m³, 2.5× usualHayang, 17 December: 38.7 µg/m³, 2.8× usualHayang, 18 December: 36.3 µg/m³, 2.6× usualHayang, 19 December: 37.3 µg/m³, 2.7× usualHayang, 20 December: 53.8 µg/m³, 3.9× usualHayang, 21 December: 11.3 µg/m³, 0.8× usualHayang, 22 December: 14.4 µg/m³, 1.0× usualHayang, 23 December: 27.9 µg/m³, 2.0× usualGyeongsan-siGyeongsan-si, 13 December: 15.2 µg/m³, 1.1× usualGyeongsan-si, 14 December: 12.3 µg/m³, 0.9× usualGyeongsan-si, 15 December: 17.5 µg/m³, 1.2× usualGyeongsan-si, 16 December: 31.1 µg/m³, 2.2× usualGyeongsan-si, 17 December: 36.5 µg/m³, 2.6× usualGyeongsan-si, 18 December: 28.9 µg/m³, 2.0× usualGyeongsan-si, 19 December: 36.8 µg/m³, 2.6× usualGyeongsan-si, 20 December: 51.5 µg/m³, 3.6× usualGyeongsan-si, 21 December: 14.6 µg/m³, 1.0× usualGyeongsan-si, 22 December: 16.3 µg/m³, 1.1× usualGyeongsan-si, 23 December: 28.7 µg/m³, 2.0× usualIcheon-siIcheon-si, 13 December: 7.9 µg/m³, 0.4× usualIcheon-si, 14 December: 15.8 µg/m³, 0.8× usualIcheon-si, 15 December: 28.5 µg/m³, 1.5× usualIcheon-si, 16 December: 35.2 µg/m³, 1.9× usualIcheon-si, 17 December: 38.9 µg/m³, 2.1× usualIcheon-si, 18 December: 40.0 µg/m³, 2.1× usualIcheon-si, 19 December: 39.7 µg/m³, 2.1× usualIcheon-si, 20 December: 46.7 µg/m³, 2.5× usualIcheon-si, 21 December: 6.0 µg/m³, 0.3× usualIcheon-si, 22 December: 12.7 µg/m³, 0.7× usualIcheon-si, 23 December: 21.2 µg/m³, 1.1× usualOkcheonOkcheon, 13 December: 12.1 µg/m³, 0.7× usualOkcheon, 14 December: 20.0 µg/m³, 1.2× usualOkcheon, 15 December: 23.4 µg/m³, 1.4× usualOkcheon, 16 December: 34.8 µg/m³, 2.1× usualOkcheon, 17 December: 45.3 µg/m³, 2.7× usualOkcheon, 18 December: 33.9 µg/m³, 2.0× usualOkcheon, 19 December: 33.8 µg/m³, 2.0× usualOkcheon, 20 December: no readingOkcheon, 21 December: 16.1 µg/m³, 1.0× usualOkcheon, 22 December: 22.9 µg/m³, 1.4× usualOkcheon, 23 December: 29.4 µg/m³, 1.7× usualCheorwonCheorwon, 13 December: 11.2 µg/m³, 0.7× usualCheorwon, 14 December: 20.8 µg/m³, 1.3× usualCheorwon, 15 December: 23.3 µg/m³, 1.5× usualCheorwon, 16 December: 33.0 µg/m³, 2.1× usualCheorwon, 17 December: 43.9 µg/m³, 2.8× usualCheorwon, 18 December: 29.3 µg/m³, 1.9× usualCheorwon, 19 December: 27.8 µg/m³, 1.8× usualCheorwon, 20 December: 32.2 µg/m³, 2.0× usualCheorwon, 21 December: 15.1 µg/m³, 1.0× usualCheorwon, 22 December: 17.4 µg/m³, 1.1× usualCheorwon, 23 December: 16.7 µg/m³, 1.1× usualEisenEisen, 13 December: 6.3 µg/m³, 0.5× usualEisen, 14 December: 9.7 µg/m³, 0.8× usualEisen, 15 December: 14.6 µg/m³, 1.2× usualEisen, 16 December: 28.2 µg/m³, 2.4× usualEisen, 17 December: 34.7 µg/m³, 3.0× usualEisen, 18 December: 36.7 µg/m³, 3.1× usualEisen, 19 December: 32.8 µg/m³, 2.8× usualEisen, 20 December: 43.8 µg/m³, 3.7× usualEisen, 21 December: 12.4 µg/m³, 1.1× usualEisen, 22 December: 9.4 µg/m³, 0.8× usualEisen, 23 December: 20.2 µg/m³, 1.7× usualYangjuYangju, 13 December: 8.2 µg/m³, 0.5× usualYangju, 14 December: 13.6 µg/m³, 0.9× usualYangju, 15 December: 20.9 µg/m³, 1.3× usualYangju, 16 December: 34.9 µg/m³, 2.2× usualYangju, 17 December: 42.2 µg/m³, 2.7× usualYangju, 18 December: 27.5 µg/m³, 1.7× usualYangju, 19 December: 37.7 µg/m³, 2.4× usualYangju, 20 December: 30.2 µg/m³, 1.9× usualYangju, 21 December: 6.6 µg/m³, 0.4× usualYangju, 22 December: 15.9 µg/m³, 1.0× usualYangju, 23 December: 25.7 µg/m³, 1.6× usualChuncheonChuncheon, 13 December: 7.4 µg/m³, 0.5× usualChuncheon, 14 December: 14.5 µg/m³, 1.0× usualChuncheon, 15 December: 22.6 µg/m³, 1.5× usualChuncheon, 16 December: 31.9 µg/m³, 2.1× usualChuncheon, 17 December: 37.8 µg/m³, 2.5× usualChuncheon, 18 December: 41.7 µg/m³, 2.8× usualChuncheon, 19 December: 29.3 µg/m³, 2.0× usualChuncheon, 20 December: 36.0 µg/m³, 2.4× usualChuncheon, 21 December: 7.9 µg/m³, 0.5× usualChuncheon, 22 December: 13.5 µg/m³, 0.9× usualChuncheon, 23 December: 13.5 µg/m³, 0.9× usualWabuWabu, 13 December: 4.1 µg/m³, 0.3× usualWabu, 14 December: 16.3 µg/m³, 1.1× usualWabu, 15 December: 25.0 µg/m³, 1.7× usualWabu, 16 December: 31.6 µg/m³, 2.1× usualWabu, 17 December: 41.7 µg/m³, 2.8× usualWabu, 18 December: 27.3 µg/m³, 1.9× usualWabu, 19 December: 25.9 µg/m³, 1.8× usualWabu, 20 December: 31.8 µg/m³, 2.2× usualWabu, 21 December: 9.5 µg/m³, 0.6× usualWabu, 22 December: no readingWabu, 23 December: 10.6 µg/m³, 0.7× usualGapyeongGapyeong, 13 December: 8.0 µg/m³, 0.6× usualGapyeong, 14 December: 12.4 µg/m³, 0.9× usualGapyeong, 15 December: 17.3 µg/m³, 1.3× usualGapyeong, 16 December: 35.0 µg/m³, 2.7× usualGapyeong, 17 December: 41.1 µg/m³, 3.1× usualGapyeong, 18 December: 35.4 µg/m³, 2.7× usualGapyeong, 19 December: 29.5 µg/m³, 2.2× usualGapyeong, 20 December: 36.5 µg/m³, 2.8× usualGapyeong, 21 December: 10.2 µg/m³, 0.8× usualGapyeong, 22 December: no readingGapyeong, 23 December: 15.3 µg/m³, 1.2× usualAnseongAnseong, 13 December: 4.1 µg/m³, 0.2× usualAnseong, 14 December: 13.8 µg/m³, 0.8× usualAnseong, 15 December: 25.0 µg/m³, 1.5× usualAnseong, 16 December: 37.3 µg/m³, 2.2× usualAnseong, 17 December: 40.2 µg/m³, 2.4× usualAnseong, 18 December: 33.9 µg/m³, 2.0× usualAnseong, 19 December: 36.5 µg/m³, 2.2× usualAnseong, 20 December: 38.9 µg/m³, 2.3× usualAnseong, 21 December: 6.6 µg/m³, 0.4× usualAnseong, 22 December: 12.9 µg/m³, 0.8× usualAnseong, 23 December: 15.4 µg/m³, 0.9× usualHwaseong-siHwaseong-si, 13 December: 5.9 µg/m³, 0.4× usualHwaseong-si, 14 December: 11.7 µg/m³, 0.8× usualHwaseong-si, 15 December: 21.6 µg/m³, 1.5× usualHwaseong-si, 16 December: 29.7 µg/m³, 2.1× usualHwaseong-si, 17 December: 38.1 µg/m³, 2.7× usualHwaseong-si, 18 December: 23.4 µg/m³, 1.6× usualHwaseong-si, 19 December: 27.5 µg/m³, 1.9× usualHwaseong-si, 20 December: 27.6 µg/m³, 1.9× usualHwaseong-si, 21 December: 5.8 µg/m³, 0.4× usualHwaseong-si, 22 December: 15.4 µg/m³, 1.1× usualHwaseong-si, 23 December: 12.9 µg/m³, 0.9× usualMunsanMunsan, 13 December: 10.8 µg/m³, 0.6× usualMunsan, 14 December: 15.5 µg/m³, 0.9× usualMunsan, 15 December: 21.1 µg/m³, 1.3× usualMunsan, 16 December: 34.5 µg/m³, 2.1× usualMunsan, 17 December: 37.9 µg/m³, 2.3× usualMunsan, 18 December: 22.1 µg/m³, 1.3× usualMunsan, 19 December: 22.0 µg/m³, 1.3× usualMunsan, 20 December: 25.9 µg/m³, 1.5× usualMunsan, 21 December: 8.7 µg/m³, 0.5× usualMunsan, 22 December: 17.3 µg/m³, 1.0× usualMunsan, 23 December: 18.0 µg/m³, 1.1× usualSeongnam-siSeongnam-si, 13 December: 5.1 µg/m³, 0.4× usualSeongnam-si, 14 December: 14.2 µg/m³, 1.0× usualSeongnam-si, 15 December: 23.0 µg/m³, 1.6× usualSeongnam-si, 16 December: 30.8 µg/m³, 2.2× usualSeongnam-si, 17 December: 37.0 µg/m³, 2.6× usualSeongnam-si, 18 December: 21.0 µg/m³, 1.5× usualSeongnam-si, 19 December: 27.2 µg/m³, 1.9× usualSeongnam-si, 20 December: 33.0 µg/m³, 2.3× usualSeongnam-si, 21 December: 7.3 µg/m³, 0.5× usualSeongnam-si, 22 December: 12.8 µg/m³, 0.9× usualSeongnam-si, 23 December: 12.5 µg/m³, 0.9× usualGanghwa-gunGanghwa-gun, 13 December: 17.2 µg/m³, 1.0× usualGanghwa-gun, 14 December: 17.9 µg/m³, 1.0× usualGanghwa-gun, 15 December: 25.8 µg/m³, 1.4× usualGanghwa-gun, 16 December: 36.2 µg/m³, 2.0× usualGanghwa-gun, 17 December: 35.6 µg/m³, 2.0× usualGanghwa-gun, 18 December: 19.9 µg/m³, 1.1× usualGanghwa-gun, 19 December: 27.4 µg/m³, 1.5× usualGanghwa-gun, 20 December: 29.0 µg/m³, 1.6× usualGanghwa-gun, 21 December: 8.8 µg/m³, 0.5× usualGanghwa-gun, 22 December: no readingGanghwa-gun, 23 December: 19.6 µg/m³, 1.1× usualSeonghwanSeonghwan, 13 December: 8.3 µg/m³, 0.4× usualSeonghwan, 14 December: 19.2 µg/m³, 0.9× usualSeonghwan, 15 December: 28.8 µg/m³, 1.4× usualSeonghwan, 16 December: 40.4 µg/m³, 2.0× usualSeonghwan, 17 December: 50.3 µg/m³, 2.5× usualSeonghwan, 18 December: 36.9 µg/m³, 1.8× usualSeonghwan, 19 December: 48.0 µg/m³, 2.3× usualSeonghwan, 20 December: 43.3 µg/m³, 2.1× usualSeonghwan, 21 December: 9.5 µg/m³, 0.5× usualSeonghwan, 22 December: 22.0 µg/m³, 1.1× usualSeonghwan, 23 December: 24.5 µg/m³, 1.2× usualSejongSejong, 13 December: 4.9 µg/m³, 0.3× usualSejong, 14 December: 13.0 µg/m³, 0.8× usualSejong, 15 December: 20.9 µg/m³, 1.3× usualSejong, 16 December: 28.4 µg/m³, 1.7× usualSejong, 17 December: 34.3 µg/m³, 2.1× usualSejong, 18 December: 31.4 µg/m³, 1.9× usualSejong, 19 December: 46.7 µg/m³, 2.8× usualSejong, 20 December: 49.9 µg/m³, 3.0× usualSejong, 21 December: 8.7 µg/m³, 0.5× usualSejong, 22 December: 18.9 µg/m³, 1.1× usualSejong, 23 December: 25.4 µg/m³, 1.5× usualChinch'ŏnChinch'ŏn, 13 December: 11.7 µg/m³, 0.7× usualChinch'ŏn, 14 December: 16.6 µg/m³, 1.0× usualChinch'ŏn, 15 December: 20.4 µg/m³, 1.2× usualChinch'ŏn, 16 December: 31.6 µg/m³, 1.8× usualChinch'ŏn, 17 December: 40.3 µg/m³, 2.3× usualChinch'ŏn, 18 December: 36.2 µg/m³, 2.1× usualChinch'ŏn, 19 December: 42.8 µg/m³, 2.5× usualChinch'ŏn, 20 December: 48.7 µg/m³, 2.8× usualChinch'ŏn, 21 December: 9.5 µg/m³, 0.6× usualChinch'ŏn, 22 December: 16.4 µg/m³, 1.0× usualChinch'ŏn, 23 December: 26.5 µg/m³, 1.5× usualDaeguDaegu, 13 December: 11.5 µg/m³, 0.9× usualDaegu, 14 December: 11.0 µg/m³, 0.8× usualDaegu, 15 December: 15.9 µg/m³, 1.2× usualDaegu, 16 December: 28.8 µg/m³, 2.2× usualDaegu, 17 December: 34.0 µg/m³, 2.6× usualDaegu, 18 December: 24.8 µg/m³, 1.9× usualDaegu, 19 December: 32.5 µg/m³, 2.4× usualDaegu, 20 December: 48.5 µg/m³, 3.6× usualDaegu, 21 December: 12.3 µg/m³, 0.9× usualDaegu, 22 December: 14.0 µg/m³, 1.1× usualDaegu, 23 December: 25.5 µg/m³, 1.9× usualHwadoHwado, 13 December: 12.8 µg/m³, 0.6× usualHwado, 14 December: 20.1 µg/m³, 1.0× usualHwado, 15 December: 28.0 µg/m³, 1.4× usualHwado, 16 December: 39.4 µg/m³, 2.0× usualHwado, 17 December: 46.3 µg/m³, 2.3× usualHwado, 18 December: 34.1 µg/m³, 1.7× usualHwado, 19 December: 32.0 µg/m³, 1.6× usualHwado, 20 December: 38.0 µg/m³, 1.9× usualHwado, 21 December: 11.3 µg/m³, 0.6× usualHwado, 22 December: 15.3 µg/m³, 0.8× usualHwado, 23 December: 16.5 µg/m³, 0.8× usualKinzanKinzan, 13 December: 11.6 µg/m³, 0.6× usualKinzan, 14 December: 13.5 µg/m³, 0.7× usualKinzan, 15 December: 18.9 µg/m³, 1.0× usualKinzan, 16 December: 26.5 µg/m³, 1.4× usualKinzan, 17 December: 39.5 µg/m³, 2.1× usualKinzan, 18 December: 29.1 µg/m³, 1.5× usualKinzan, 19 December: 25.9 µg/m³, 1.4× usualKinzan, 20 December: 45.2 µg/m³, 2.4× usualKinzan, 21 December: 12.1 µg/m³, 0.6× usualKinzan, 22 December: 16.0 µg/m³, 0.8× usualKinzan, 23 December: 20.3 µg/m³, 1.1× usualOsanOsan, 13 December: 5.1 µg/m³, 0.3× usualOsan, 14 December: 14.7 µg/m³, 0.9× usualOsan, 15 December: 21.9 µg/m³, 1.4× usualOsan, 16 December: 29.2 µg/m³, 1.8× usualOsan, 17 December: 44.9 µg/m³, 2.8× usualOsan, 18 December: 35.2 µg/m³, 2.2× usualOsan, 19 December: 27.9 µg/m³, 1.7× usualOsan, 20 December: 31.2 µg/m³, 1.9× usualOsan, 21 December: 7.6 µg/m³, 0.5× usualOsan, 22 December: 12.6 µg/m³, 0.8× usualOsan, 23 December: 12.8 µg/m³, 0.8× usualYeongdongYeongdong, 13 December: 7.6 µg/m³, 0.4× usualYeongdong, 14 December: 17.8 µg/m³, 0.9× usualYeongdong, 15 December: 20.1 µg/m³, 1.1× usualYeongdong, 16 December: 25.9 µg/m³, 1.4× usualYeongdong, 17 December: 41.8 µg/m³, 2.2× usualYeongdong, 18 December: 32.4 µg/m³, 1.7× usualYeongdong, 19 December: 34.1 µg/m³, 1.8× usualYeongdong, 20 December: 44.9 µg/m³, 2.4× usualYeongdong, 21 December: 16.0 µg/m³, 0.8× usualYeongdong, 22 December: 16.2 µg/m³, 0.9× usualYeongdong, 23 December: 23.0 µg/m³, 1.2× usualPyeongtaekPyeongtaek, 13 December: 6.6 µg/m³, 0.4× usualPyeongtaek, 14 December: 15.4 µg/m³, 0.9× usualPyeongtaek, 15 December: 23.8 µg/m³, 1.4× usualPyeongtaek, 16 December: 31.4 µg/m³, 1.8× usualPyeongtaek, 17 December: 43.6 µg/m³, 2.5× usualPyeongtaek, 18 December: 37.2 µg/m³, 2.2× usualPyeongtaek, 19 December: 32.3 µg/m³, 1.9× usualPyeongtaek, 20 December: 30.3 µg/m³, 1.8× usualPyeongtaek, 21 December: 7.1 µg/m³, 0.4× usualPyeongtaek, 22 December: 14.3 µg/m³, 0.8× usualPyeongtaek, 23 December: 14.2 µg/m³, 0.8× usualChungjuChungju, 13 December: 8.1 µg/m³, 0.5× usualChungju, 14 December: 16.8 µg/m³, 0.9× usualChungju, 15 December: 23.1 µg/m³, 1.3× usualChungju, 16 December: 26.5 µg/m³, 1.5× usualChungju, 17 December: 37.8 µg/m³, 2.1× usualChungju, 18 December: 37.3 µg/m³, 2.1× usualChungju, 19 December: 38.1 µg/m³, 2.1× usualChungju, 20 December: 43.0 µg/m³, 2.4× usualChungju, 21 December: 11.6 µg/m³, 0.6× usualChungju, 22 December: 17.8 µg/m³, 1.0× usualChungju, 23 December: 19.8 µg/m³, 1.1× usualAsanAsan, 13 December: 7.1 µg/m³, 0.4× usualAsan, 14 December: 14.8 µg/m³, 0.9× usualAsan, 15 December: 20.5 µg/m³, 1.2× usualAsan, 16 December: 28.3 µg/m³, 1.6× usualAsan, 17 December: 42.6 µg/m³, 2.4× usualAsan, 18 December: 28.9 µg/m³, 1.7× usualAsan, 19 December: 33.2 µg/m³, 1.9× usualAsan, 20 December: 39.0 µg/m³, 2.2× usualAsan, 21 December: 9.4 µg/m³, 0.5× usualAsan, 22 December: 17.8 µg/m³, 1.0× usualAsan, 23 December: 19.0 µg/m³, 1.1× usualSuwonSuwon, 13 December: 7.0 µg/m³, 0.4× usualSuwon, 14 December: 15.9 µg/m³, 1.0× usualSuwon, 15 December: 24.6 µg/m³, 1.5× usualSuwon, 16 December: 32.8 µg/m³, 2.0× usualSuwon, 17 December: 42.2 µg/m³, 2.5× usualSuwon, 18 December: 27.0 µg/m³, 1.6× usualSuwon, 19 December: 30.4 µg/m³, 1.8× usualSuwon, 20 December: 35.0 µg/m³, 2.1× usualSuwon, 21 December: 8.3 µg/m³, 0.5× usualSuwon, 22 December: 14.2 µg/m³, 0.9× usualSuwon, 23 December: 14.5 µg/m³, 0.9× usualGimpo-siGimpo-si, 13 December: 14.2 µg/m³, 0.9× usualGimpo-si, 14 December: 19.3 µg/m³, 1.2× usualGimpo-si, 15 December: 23.9 µg/m³, 1.4× usualGimpo-si, 16 December: 31.7 µg/m³, 1.9× usualGimpo-si, 17 December: 41.4 µg/m³, 2.5× usualGimpo-si, 18 December: 19.1 µg/m³, 1.2× usualGimpo-si, 19 December: 28.6 µg/m³, 1.7× usualGimpo-si, 20 December: 30.9 µg/m³, 1.9× usualGimpo-si, 21 December: 9.7 µg/m³, 0.6× usualGimpo-si, 22 December: 17.6 µg/m³, 1.1× usualGimpo-si, 23 December: 18.3 µg/m³, 1.1× usualSangjuSangju, 13 December: no readingSangju, 14 December: 18.2 µg/m³, 1.1× usualSangju, 15 December: 22.5 µg/m³, 1.4× usualSangju, 16 December: 29.4 µg/m³, 1.8× usualSangju, 17 December: 40.8 µg/m³, 2.5× usualSangju, 18 December: 35.3 µg/m³, 2.2× usualSangju, 19 December: 29.9 µg/m³, 1.8× usualSangju, 20 December: 41.3 µg/m³, 2.5× usualSangju, 21 December: 12.5 µg/m³, 0.8× usualSangju, 22 December: 19.5 µg/m³, 1.2× usualSangju, 23 December: 22.3 µg/m³, 1.4× usualGoyang-siGoyang-si, 13 December: 9.9 µg/m³, 0.6× usualGoyang-si, 14 December: 17.0 µg/m³, 1.1× usualGoyang-si, 15 December: 20.5 µg/m³, 1.3× usualGoyang-si, 16 December: 30.7 µg/m³, 1.9× usualGoyang-si, 17 December: 40.9 µg/m³, 2.5× usualGoyang-si, 18 December: 18.4 µg/m³, 1.1× usualGoyang-si, 19 December: 26.3 µg/m³, 1.6× usualGoyang-si, 20 December: 27.3 µg/m³, 1.7× usualGoyang-si, 21 December: 5.0 µg/m³, 0.3× usualGoyang-si, 22 December: 16.7 µg/m³, 1.0× usualGoyang-si, 23 December: 18.4 µg/m³, 1.1× usualWaegwanWaegwan, 13 December: 11.0 µg/m³, 0.7× usualWaegwan, 14 December: 11.9 µg/m³, 0.8× usualWaegwan, 15 December: 17.7 µg/m³, 1.2× usualWaegwan, 16 December: 27.6 µg/m³, 1.9× usualWaegwan, 17 December: 36.5 µg/m³, 2.5× usualWaegwan, 18 December: 24.5 µg/m³, 1.7× usualWaegwan, 19 December: 28.6 µg/m³, 1.9× usualWaegwan, 20 December: 40.8 µg/m³, 2.8× usualWaegwan, 21 December: 14.6 µg/m³, 1.0× usualWaegwan, 22 December: 15.6 µg/m³, 1.1× usualWaegwan, 23 December: 20.8 µg/m³, 1.4× usualAnsan-siAnsan-si, 13 December: 7.1 µg/m³, 0.5× usualAnsan-si, 14 December: 13.9 µg/m³, 0.9× usualAnsan-si, 15 December: 22.3 µg/m³, 1.5× usualAnsan-si, 16 December: 28.6 µg/m³, 1.9× usualAnsan-si, 17 December: 40.7 µg/m³, 2.7× usualAnsan-si, 18 December: 23.0 µg/m³, 1.5× usualAnsan-si, 19 December: 26.8 µg/m³, 1.8× usualAnsan-si, 20 December: 28.7 µg/m³, 1.9× usualAnsan-si, 21 December: 6.4 µg/m³, 0.4× usualAnsan-si, 22 December: 16.8 µg/m³, 1.1× usualAnsan-si, 23 December: 14.1 µg/m³, 0.9× usualGwangmyeongGwangmyeong, 13 December: 7.1 µg/m³, 0.5× usualGwangmyeong, 14 December: 18.3 µg/m³, 1.2× usualGwangmyeong, 15 December: 22.8 µg/m³, 1.5× usualGwangmyeong, 16 December: 28.9 µg/m³, 1.8× usualGwangmyeong, 17 December: 40.4 µg/m³, 2.6× usualGwangmyeong, 18 December: 20.7 µg/m³, 1.3× usualGwangmyeong, 19 December: 28.2 µg/m³, 1.8× usualGwangmyeong, 20 December: 30.5 µg/m³, 1.9× usualGwangmyeong, 21 December: 8.5 µg/m³, 0.5× usualGwangmyeong, 22 December: 14.7 µg/m³, 0.9× usualGwangmyeong, 23 December: 13.3 µg/m³, 0.8× usualSeoulSeoul, 13 December: 7.1 µg/m³, 0.4× usualSeoul, 14 December: 17.8 µg/m³, 1.1× usualSeoul, 15 December: 22.3 µg/m³, 1.4× usualSeoul, 16 December: 28.5 µg/m³, 1.8× usualSeoul, 17 December: 40.1 µg/m³, 2.5× usualSeoul, 18 December: 21.1 µg/m³, 1.3× usualSeoul, 19 December: 24.4 µg/m³, 1.5× usualSeoul, 20 December: 30.9 µg/m³, 1.9× usualSeoul, 21 December: 8.2 µg/m³, 0.5× usualSeoul, 22 December: 13.3 µg/m³, 0.8× usualSeoul, 23 December: 11.5 µg/m³, 0.7× usualUijeongbu-siUijeongbu-si, 13 December: 6.9 µg/m³, 0.4× usualUijeongbu-si, 14 December: 15.4 µg/m³, 1.0× usualUijeongbu-si, 15 December: 24.4 µg/m³, 1.5× usualUijeongbu-si, 16 December: 31.2 µg/m³, 2.0× usualUijeongbu-si, 17 December: 40.0 µg/m³, 2.5× usualUijeongbu-si, 18 December: 23.1 µg/m³, 1.5× usualUijeongbu-si, 19 December: 25.7 µg/m³, 1.6× usualUijeongbu-si, 20 December: 29.4 µg/m³, 1.9× usualUijeongbu-si, 21 December: 7.8 µg/m³, 0.5× usualUijeongbu-si, 22 December: 14.2 µg/m³, 0.9× usualUijeongbu-si, 23 December: 17.1 µg/m³, 1.1× usualGuri-siGuri-si, 13 December: 6.2 µg/m³, 0.4× usualGuri-si, 14 December: 17.2 µg/m³, 1.1× usualGuri-si, 15 December: 22.8 µg/m³, 1.4× usualGuri-si, 16 December: 26.2 µg/m³, 1.6× usualGuri-si, 17 December: 39.6 µg/m³, 2.4× usualGuri-si, 18 December: 25.3 µg/m³, 1.6× usualGuri-si, 19 December: 24.5 µg/m³, 1.5× usualGuri-si, 20 December: 29.3 µg/m³, 1.8× usualGuri-si, 21 December: 8.2 µg/m³, 0.5× usualGuri-si, 22 December: 12.0 µg/m³, 0.7× usualGuri-si, 23 December: 11.8 µg/m³, 0.7× usualBucheon-siBucheon-si, 13 December: 8.3 µg/m³, 0.6× usualBucheon-si, 14 December: 15.9 µg/m³, 1.1× usualBucheon-si, 15 December: 22.4 µg/m³, 1.5× usualBucheon-si, 16 December: 28.6 µg/m³, 1.9× usualBucheon-si, 17 December: 39.5 µg/m³, 2.7× usualBucheon-si, 18 December: 18.7 µg/m³, 1.3× usualBucheon-si, 19 December: 26.8 µg/m³, 1.8× usualBucheon-si, 20 December: 29.7 µg/m³, 2.0× usualBucheon-si, 21 December: 7.8 µg/m³, 0.5× usualBucheon-si, 22 December: 16.3 µg/m³, 1.1× usualBucheon-si, 23 December: 14.5 µg/m³, 1.0× usualAnyang-siAnyang-si, 13 December: 5.3 µg/m³, 0.4× usualAnyang-si, 14 December: 15.1 µg/m³, 1.0× usualAnyang-si, 15 December: 19.2 µg/m³, 1.3× usualAnyang-si, 16 December: 27.5 µg/m³, 1.9× usualAnyang-si, 17 December: 39.3 µg/m³, 2.7× usualAnyang-si, 18 December: 18.5 µg/m³, 1.3× usualAnyang-si, 19 December: 25.4 µg/m³, 1.8× usualAnyang-si, 20 December: 29.5 µg/m³, 2.0× usualAnyang-si, 21 December: 7.2 µg/m³, 0.5× usualAnyang-si, 22 December: 12.0 µg/m³, 0.8× usualAnyang-si, 23 December: 12.4 µg/m³, 0.9× usualHwawŏnHwawŏn, 13 December: 9.3 µg/m³, 0.7× usualHwawŏn, 14 December: 8.4 µg/m³, 0.7× usualHwawŏn, 15 December: 14.0 µg/m³, 1.1× usualHwawŏn, 16 December: 25.2 µg/m³, 2.0× usualHwawŏn, 17 December: 30.8 µg/m³, 2.4× usualHwawŏn, 18 December: 23.2 µg/m³, 1.8× usualHwawŏn, 19 December: 27.2 µg/m³, 2.2× usualHwawŏn, 20 December: 38.9 µg/m³, 3.1× usualHwawŏn, 21 December: 10.6 µg/m³, 0.8× usualHwawŏn, 22 December: 12.5 µg/m³, 1.0× usualHwawŏn, 23 December: 19.8 µg/m³, 1.6× usualKoesanKoesan, 13 December: 6.1 µg/m³, 0.3× usualKoesan, 14 December: 17.7 µg/m³, 1.0× usualKoesan, 15 December: 17.5 µg/m³, 1.0× usualKoesan, 16 December: 20.9 µg/m³, 1.2× usualKoesan, 17 December: 37.9 µg/m³, 2.1× usualKoesan, 18 December: 29.3 µg/m³, 1.6× usualKoesan, 19 December: 28.0 µg/m³, 1.6× usualKoesan, 20 December: 34.3 µg/m³, 1.9× usualKoesan, 21 December: 9.9 µg/m³, 0.6× usualKoesan, 22 December: 12.0 µg/m³, 0.7× usualKoesan, 23 December: 16.9 µg/m³, 0.9× usualYesanYesan, 13 December: 15.8 µg/m³, 1.1× usualYesan, 14 December: 15.0 µg/m³, 1.0× usualYesan, 15 December: 19.0 µg/m³, 1.3× usualYesan, 16 December: 23.9 µg/m³, 1.6× usualYesan, 17 December: 37.7 µg/m³, 2.5× usualYesan, 18 December: 25.1 µg/m³, 1.7× usualYesan, 19 December: 28.0 µg/m³, 1.9× usualYesan, 20 December: 31.4 µg/m³, 2.1× usualYesan, 21 December: 7.2 µg/m³, 0.5× usualYesan, 22 December: 15.0 µg/m³, 1.0× usualYesan, 23 December: 19.3 µg/m³, 1.3× usualTangjinTangjin, 13 December: 9.0 µg/m³, 0.6× usualTangjin, 14 December: 16.8 µg/m³, 1.1× usualTangjin, 15 December: 19.4 µg/m³, 1.3× usualTangjin, 16 December: 21.8 µg/m³, 1.5× usualTangjin, 17 December: 37.6 µg/m³, 2.5× usualTangjin, 18 December: 20.5 µg/m³, 1.4× usualTangjin, 19 December: 32.4 µg/m³, 2.2× usualTangjin, 20 December: 32.0 µg/m³, 2.2× usualTangjin, 21 December: 12.2 µg/m³, 0.8× usualTangjin, 22 December: 14.9 µg/m³, 1.0× usualTangjin, 23 December: 17.6 µg/m³, 1.2× usualMungyeongMungyeong, 13 December: 4.9 µg/m³, 0.4× usualMungyeong, 14 December: 10.3 µg/m³, 0.8× usualMungyeong, 15 December: 14.5 µg/m³, 1.2× usualMungyeong, 16 December: 21.5 µg/m³, 1.7× usualMungyeong, 17 December: 31.6 µg/m³, 2.6× usualMungyeong, 18 December: 30.4 µg/m³, 2.5× usualMungyeong, 19 December: 26.3 µg/m³, 2.1× usualMungyeong, 20 December: 37.2 µg/m³, 3.0× usualMungyeong, 21 December: 7.2 µg/m³, 0.6× usualMungyeong, 22 December: 12.5 µg/m³, 1.0× usualMungyeong, 23 December: 16.9 µg/m³, 1.4× usualCheonanCheonan, 13 December: 6.4 µg/m³, 0.4× usualCheonan, 14 December: 13.5 µg/m³, 0.9× usualCheonan, 15 December: 20.1 µg/m³, 1.3× usualCheonan, 16 December: 24.0 µg/m³, 1.6× usualCheonan, 17 December: 36.3 µg/m³, 2.4× usualCheonan, 18 December: 29.5 µg/m³, 2.0× usualCheonan, 19 December: 31.3 µg/m³, 2.1× usualCheonan, 20 December: 28.5 µg/m³, 1.9× usualCheonan, 21 December: 6.5 µg/m³, 0.4× usualCheonan, 22 December: 17.3 µg/m³, 1.2× usualCheonan, 23 December: 16.5 µg/m³, 1.1× usualChangsuChangsu, 13 December: 3.8 µg/m³, 0.3× usualChangsu, 14 December: 10.5 µg/m³, 0.8× usualChangsu, 15 December: 15.2 µg/m³, 1.1× usualChangsu, 16 December: 20.5 µg/m³, 1.5× usualChangsu, 17 December: 32.6 µg/m³, 2.3× usualChangsu, 18 December: 20.9 µg/m³, 1.5× usualChangsu, 19 December: 17.3 µg/m³, 1.2× usualChangsu, 20 December: 36.1 µg/m³, 2.6× usualChangsu, 21 December: 9.1 µg/m³, 0.7× usualChangsu, 22 December: 11.0 µg/m³, 0.8× usualChangsu, 23 December: 12.3 µg/m³, 0.9× usualGongjuGongju, 13 December: 5.1 µg/m³, 0.4× usualGongju, 14 December: 11.0 µg/m³, 0.8× usualGongju, 15 December: 14.5 µg/m³, 1.1× usualGongju, 16 December: 25.6 µg/m³, 1.9× usualGongju, 17 December: 27.8 µg/m³, 2.0× usualGongju, 18 December: 19.0 µg/m³, 1.4× usualGongju, 19 December: 27.8 µg/m³, 2.0× usualGongju, 20 December: 36.0 µg/m³, 2.6× usualGongju, 21 December: 6.9 µg/m³, 0.5× usualGongju, 22 December: 10.3 µg/m³, 0.7× usualGongju, 23 December: 18.6 µg/m³, 1.3× usualTaesal-liTaesal-li, 13 December: 9.5 µg/m³, 1.1× usualTaesal-li, 14 December: 10.5 µg/m³, 1.3× usualTaesal-li, 15 December: 16.1 µg/m³, 1.9× usualTaesal-li, 16 December: 21.6 µg/m³, 2.6× usualTaesal-li, 17 December: 35.9 µg/m³, 4.3× usualTaesal-li, 18 December: 13.0 µg/m³, 1.5× usualTaesal-li, 19 December: 20.7 µg/m³, 2.5× usualTaesal-li, 20 December: 19.5 µg/m³, 2.3× usualTaesal-li, 21 December: 8.4 µg/m³, 1.0× usualTaesal-li, 22 December: 14.9 µg/m³, 1.8× usualTaesal-li, 23 December: 19.3 µg/m³, 2.3× usualIncheonIncheon, 13 December: 9.1 µg/m³, 0.6× usualIncheon, 14 December: 16.0 µg/m³, 1.1× usualIncheon, 15 December: 22.4 µg/m³, 1.5× usualIncheon, 16 December: 27.6 µg/m³, 1.8× usualIncheon, 17 December: 35.9 µg/m³, 2.4× usualIncheon, 18 December: 19.2 µg/m³, 1.3× usualIncheon, 19 December: 24.7 µg/m³, 1.6× usualIncheon, 20 December: 24.6 µg/m³, 1.6× usualIncheon, 21 December: 8.7 µg/m³, 0.6× usualIncheon, 22 December: 17.6 µg/m³, 1.2× usualIncheon, 23 December: 16.3 µg/m³, 1.1× usualNangenNangen, 13 December: 8.0 µg/m³, 0.5× usualNangen, 14 December: 15.5 µg/m³, 0.9× usualNangen, 15 December: 18.4 µg/m³, 1.1× usualNangen, 16 December: 28.5 µg/m³, 1.7× usualNangen, 17 December: 35.8 µg/m³, 2.1× usualNangen, 18 December: 27.2 µg/m³, 1.6× usualNangen, 19 December: 23.6 µg/m³, 1.4× usualNangen, 20 December: 32.4 µg/m³, 1.9× usualNangen, 21 December: 10.5 µg/m³, 0.6× usualNangen, 22 December: 11.9 µg/m³, 0.7× usualNangen, 23 December: 16.5 µg/m³, 1.0× usualNamyangjuNamyangju, 13 December: 6.9 µg/m³, 0.4× usualNamyangju, 14 December: 16.5 µg/m³, 1.0× usualNamyangju, 15 December: 22.2 µg/m³, 1.3× usualNamyangju, 16 December: 33.6 µg/m³, 2.0× usualNamyangju, 17 December: 35.7 µg/m³, 2.1× usualNamyangju, 18 December: 28.4 µg/m³, 1.7× usualNamyangju, 19 December: 29.4 µg/m³, 1.7× usualNamyangju, 20 December: 31.2 µg/m³, 1.8× usualNamyangju, 21 December: 11.8 µg/m³, 0.7× usualNamyangju, 22 December: 15.9 µg/m³, 0.9× usualNamyangju, 23 December: 28.1 µg/m³, 1.7× usualAndongAndong, 13 December: 7.8 µg/m³, 0.5× usualAndong, 14 December: 14.1 µg/m³, 0.9× usualAndong, 15 December: 18.3 µg/m³, 1.2× usualAndong, 16 December: 24.2 µg/m³, 1.5× usualAndong, 17 December: 33.2 µg/m³, 2.1× usualAndong, 18 December: 35.7 µg/m³, 2.2× usualAndong, 19 December: 29.3 µg/m³, 1.8× usualAndong, 20 December: 33.0 µg/m³, 2.1× usualAndong, 21 December: 13.1 µg/m³, 0.8× usualAndong, 22 December: 13.3 µg/m³, 0.8× usualAndong, 23 December: 14.5 µg/m³, 0.9× usualHongch’ŏnHongch’ŏn, 13 December: 9.3 µg/m³, 0.5× usualHongch’ŏn, 14 December: 9.7 µg/m³, 0.6× usualHongch’ŏn, 15 December: 16.3 µg/m³, 0.9× usualHongch’ŏn, 16 December: 23.7 µg/m³, 1.4× usualHongch’ŏn, 17 December: 31.0 µg/m³, 1.8× usualHongch’ŏn, 18 December: 35.4 µg/m³, 2.0× usualHongch’ŏn, 19 December: 27.9 µg/m³, 1.6× usualHongch’ŏn, 20 December: 38.0 µg/m³, 2.2× usualHongch’ŏn, 21 December: 5.5 µg/m³, 0.3× usualHongch’ŏn, 22 December: 10.6 µg/m³, 0.6× usualHongch’ŏn, 23 December: 14.3 µg/m³, 0.8× usualWŏnjuWŏnju, 13 December: 10.0 µg/m³, 0.5× usualWŏnju, 14 December: 14.8 µg/m³, 0.7× usualWŏnju, 15 December: 23.6 µg/m³, 1.2× usualWŏnju, 16 December: 28.3 µg/m³, 1.4× usualWŏnju, 17 December: 35.3 µg/m³, 1.8× usualWŏnju, 18 December: 37.5 µg/m³, 1.9× usualWŏnju, 19 December: 40.7 µg/m³, 2.0× usualWŏnju, 20 December: 32.5 µg/m³, 1.6× usualWŏnju, 21 December: 11.6 µg/m³, 0.6× usualWŏnju, 22 December: 18.1 µg/m³, 0.9× usualWŏnju, 23 December: 21.0 µg/m³, 1.1× usualCheongju-siCheongju-si, 13 December: 6.2 µg/m³, 0.3× usualCheongju-si, 14 December: 16.7 µg/m³, 0.9× usualCheongju-si, 15 December: 21.7 µg/m³, 1.2× usualCheongju-si, 16 December: 27.8 µg/m³, 1.6× usualCheongju-si, 17 December: 36.9 µg/m³, 2.1× usualCheongju-si, 18 December: 35.3 µg/m³, 2.0× usualCheongju-si, 19 December: 37.6 µg/m³, 2.1× usualCheongju-si, 20 December: 39.5 µg/m³, 2.2× usualCheongju-si, 21 December: 10.2 µg/m³, 0.6× usualCheongju-si, 22 December: no readingCheongju-si, 23 December: 24.5 µg/m³, 1.4× usualGimcheonGimcheon, 13 December: 9.5 µg/m³, 0.5× usualGimcheon, 14 December: 13.5 µg/m³, 0.7× usualGimcheon, 15 December: 17.3 µg/m³, 0.9× usualGimcheon, 16 December: 28.8 µg/m³, 1.6× usualGimcheon, 17 December: 33.7 µg/m³, 1.8× usualGimcheon, 18 December: 23.7 µg/m³, 1.3× usualGimcheon, 19 December: 25.9 µg/m³, 1.4× usualGimcheon, 20 December: 46.3 µg/m³, 2.5× usualGimcheon, 21 December: 14.6 µg/m³, 0.8× usualGimcheon, 22 December: 16.2 µg/m³, 0.9× usualGimcheon, 23 December: 24.3 µg/m³, 1.3× usualGumiGumi, 13 December: 11.9 µg/m³, 0.6× usualGumi, 14 December: 16.6 µg/m³, 0.8× usualGumi, 15 December: 22.1 µg/m³, 1.1× usualGumi, 16 December: 29.2 µg/m³, 1.4× usualGumi, 17 December: 38.2 µg/m³, 1.9× usualGumi, 18 December: 31.1 µg/m³, 1.5× usualGumi, 19 December: 30.5 µg/m³, 1.5× usualGumi, 20 December: 45.9 µg/m³, 2.2× usualGumi, 21 December: 17.0 µg/m³, 0.8× usualGumi, 22 December: 19.4 µg/m³, 0.9× usualGumi, 23 December: 23.7 µg/m³, 1.2× usualJungpyongJungpyong, 13 December: 5.9 µg/m³, 0.3× usualJungpyong, 14 December: 15.9 µg/m³, 0.8× usualJungpyong, 15 December: 18.7 µg/m³, 1.0× usualJungpyong, 16 December: 28.4 µg/m³, 1.5× usualJungpyong, 17 December: 36.4 µg/m³, 1.9× usualJungpyong, 18 December: 32.8 µg/m³, 1.7× usualJungpyong, 19 December: 31.7 µg/m³, 1.6× usualJungpyong, 20 December: 39.1 µg/m³, 2.0× usualJungpyong, 21 December: 10.4 µg/m³, 0.5× usualJungpyong, 22 December: 16.1 µg/m³, 0.8× usualJungpyong, 23 December: 22.9 µg/m³, 1.2× usualYŏnmuYŏnmu, 13 December: 10.7 µg/m³, 0.6× usualYŏnmu, 14 December: 15.0 µg/m³, 0.9× usualYŏnmu, 15 December: 17.6 µg/m³, 1.0× usualYŏnmu, 16 December: 29.4 µg/m³, 1.7× usualYŏnmu, 17 December: 32.5 µg/m³, 1.9× usualYŏnmu, 18 December: 27.3 µg/m³, 1.6× usualYŏnmu, 19 December: 30.2 µg/m³, 1.8× usualYŏnmu, 20 December: 39.0 µg/m³, 2.3× usualYŏnmu, 21 December: 6.4 µg/m³, 0.4× usualYŏnmu, 22 December: 18.1 µg/m³, 1.1× usualYŏnmu, 23 December: 22.1 µg/m³, 1.3× usualGwangjuGwangju, 13 December: 7.1 µg/m³, 0.4× usualGwangju, 14 December: 14.9 µg/m³, 0.8× usualGwangju, 15 December: 26.6 µg/m³, 1.4× usualGwangju, 16 December: 31.4 µg/m³, 1.7× usualGwangju, 17 December: 33.2 µg/m³, 1.8× usualGwangju, 18 December: 30.3 µg/m³, 1.6× usualGwangju, 19 December: 30.3 µg/m³, 1.6× usualGwangju, 20 December: 38.8 µg/m³, 2.1× usualGwangju, 21 December: 8.4 µg/m³, 0.5× usualGwangju, 22 December: 14.8 µg/m³, 0.8× usualGwangju, 23 December: 15.1 µg/m³, 0.8× usualNonsanNonsan, 13 December: 6.0 µg/m³, 0.4× usualNonsan, 14 December: 13.2 µg/m³, 0.8× usualNonsan, 15 December: 17.8 µg/m³, 1.1× usualNonsan, 16 December: 25.4 µg/m³, 1.6× usualNonsan, 17 December: 28.0 µg/m³, 1.8× usualNonsan, 18 December: 20.9 µg/m³, 1.3× usualNonsan, 19 December: 24.3 µg/m³, 1.5× usualNonsan, 20 December: 38.6 µg/m³, 2.4× usualNonsan, 21 December: 6.1 µg/m³, 0.4× usualNonsan, 22 December: 11.7 µg/m³, 0.7× usualNonsan, 23 December: 16.0 µg/m³, 1.0× usual13 Dec1517192123
The 60 cities with the highest readings of 107, 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 35.917 December8.44.3×
HayangGyeongsangbuk-do, South Korea5 53.820 December13.93.9×
EisenGyeongsangbuk-do, South Korea5 43.820 December11.73.7×
DaeguDaegu, South Korea3 48.520 December13.33.6×
Gyeongsan-siGyeongsangbuk-do, South Korea5 51.520 December14.33.6×
KuryeJeollanam-do, South Korea1 27.217 December8.33.3×
GapyeongGyeonggi-do, South Korea5 41.117 December13.23.1×
HwawŏnDaegu, South Korea3 38.920 December12.63.1×
MungyeongGyeongsangbuk-do, South Korea4 37.220 December12.33.0×
ChangwonGyeongsangnam-do, South Korea3 32.320 December10.73.0×
GeojeGyeongsangnam-do, South Korea1 31.619 December10.53.0×
SejongSejong-si, South Korea3 49.920 December16.73.0×
WabuGyeonggi-do, South Korea3 41.717 December14.72.8×
Chinch'ŏnNorth Chungcheong, South Korea4 48.720 December17.22.8×
HadongGyeongsangnam-do, South Korea1 26.517 December9.52.8×
OsanGyeonggi-do, South Korea2 44.917 December16.12.8×
ChangnyeongGyeongsangnam-do, South Korea3 34.520 December12.42.8×
ChuncheonGangwon-do, South Korea4 41.718 December15.02.8×
CheorwonGangwon-do, South Korea2 43.917 December15.82.8×
WaegwanGyeongsangbuk-do, South Korea2 40.820 December14.72.8×
GyeongjuGyeongsangbuk-do, South Korea2 31.017 December11.22.8×
Anyang-siGyeonggi-do, South Korea1 39.317 December14.42.7×
Ansan-siGyeonggi-do, South Korea1 40.717 December15.02.7×
Hwaseong-siGyeonggi-do, South Korea2 38.117 December14.22.7×
KimhaeGyeongsangnam-do, South Korea3 33.820 December12.62.7×
OkcheonNorth Chungcheong, South Korea4 45.317 December16.92.7×
YangjuGyeonggi-do, South Korea3 42.217 December15.92.7×
Bucheon-siGyeonggi-do, South Korea1 39.517 December14.92.7×
HaenamJeollanam-do, South Korea2 27.020 December10.22.6×
YeonilGyeongsangbuk-do, South Korea3 35.020 December13.42.6×
GongjuChungcheongnam-do, South Korea3 36.020 December13.82.6×
ChangsuJeollabuk-do, South Korea2 36.120 December13.92.6×
YeongamJeollanam-do, South Korea2 29.620 December11.42.6×
KwangyangJeollanam-do, South Korea1 28.020 December10.82.6×
Seongnam-siGyeonggi-do, South Korea3 37.017 December14.32.6×
NaesŏGyeongsangnam-do, South Korea1 32.620 December12.62.6×
Jinan-gunJeollabuk-do, South Korea2 30.517 December11.82.6×
GwangmyeongGyeonggi-do, South Korea1 40.417 December15.72.6×
YecheonGyeongsangbuk-do, South Korea4 33.420 December13.02.6×
MiryangGyeongsangnam-do, South Korea4 32.520 December12.72.6×
YesanChungcheongnam-do, South Korea2 37.717 December14.82.5×
DaejeonDaejeon, South Korea2 32.820 December12.92.5×
SuwonGyeonggi-do, South Korea2 42.217 December16.62.5×
TangjinChungcheongnam-do, South Korea3 37.617 December14.82.5×
Goyang-siGyeonggi-do, South Korea1 40.917 December16.12.5×
KunwiGyeongsangbuk-do, South Korea3 32.217 December12.72.5×
Uijeongbu-siGyeonggi-do, South Korea1 40.017 December15.82.5×
PyeongtaekGyeonggi-do, South Korea2 43.617 December17.32.5×
SangjuGyeongsangbuk-do, South Korea3 41.320 December16.42.5×
BoseongJeollanam-do, South Korea1 29.620 December11.82.5×
SeoulSeoul, South Korea1 40.117 December16.02.5×
GwangyangJeollanam-do, South Korea1 25.820 December10.32.5×
GimcheonGyeongsangbuk-do, South Korea1 46.320 December18.52.5×
Gimpo-siGyeonggi-do, South Korea1 41.417 December16.62.5×
Icheon-siGyeonggi-do, South Korea5 46.720 December18.82.5×
SuncheonJeollanam-do, South Korea1 26.820 December10.82.5×
ImsilJeollabuk-do, South Korea2 28.617 December11.62.5×
SeonghwanChungcheongnam-do, South Korea3 50.317 December20.52.5×
AsanChungcheongnam-do, South Korea2 42.617 December17.42.4×
Guri-siGyeonggi-do, South Korea1 39.617 December16.22.4×
CheonanChungcheongnam-do, South Korea2 36.317 December14.92.4×
BoryeongChungcheongnam-do, South Korea1 34.117 December14.02.4×
NonsanChungcheongnam-do, South Korea1 38.620 December16.02.4×
YeosuJeollanam-do, South Korea2 25.520 December10.62.4×
ChungjuNorth Chungcheong, South Korea4 43.020 December17.92.4×
AnseongGyeonggi-do, South Korea5 40.217 December16.82.4×
YeongdongNorth Chungcheong, South Korea2 44.920 December18.92.4×
Cheongsong gunGyeongsangbuk-do, South Korea2 28.517 December12.02.4×
KinzanChungcheongnam-do, South Korea2 45.220 December19.12.4×
IncheonIncheon, South Korea1 35.917 December15.22.4×
Koch'angJeollabuk-do, South Korea2 25.417 December10.82.4×
YangguGangwon-do, South Korea1 28.020 December12.02.3×
HwadoGyeonggi-do, South Korea1 46.317 December20.12.3×
DamyangJeollanam-do, South Korea2 27.617 December12.02.3×
ChinjuGyeongsangnam-do, South Korea2 30.420 December13.32.3×
YŏnmuChungcheongnam-do, South Korea1 39.020 December17.22.3×
MunsanGyeonggi-do, South Korea2 37.917 December16.82.3×
AndongGyeongsangbuk-do, South Korea3 35.718 December15.92.2×
GumiGyeongsangbuk-do, South Korea1 45.920 December20.52.2×
HongseongChungcheongnam-do, South Korea1 34.917 December15.72.2×
Cheongju-siNorth Chungcheong, South Korea2 39.520 December17.92.2×
GunsanJeollabuk-do, South Korea2 31.517 December14.32.2×
UlsanUlsan, South Korea2 27.717 December12.62.2×
Hongch’ŏnGangwon-do, South Korea2 38.020 December17.32.2×
TongyeongGyeongsangnam-do, South Korea2 29.420 December13.42.2×
NeietsuGangwon-do, South Korea1 31.818 December14.62.2×
IksanJeollabuk-do, South Korea1 35.620 December16.52.2×
SinhyeonGyeongsangnam-do, South Korea1 26.417 December12.32.1×
MokpoJeollanam-do, South Korea1 31.217 December14.62.1×
HanamGyeonggi-do, South Korea1 35.017 December16.42.1×
NangenJeollabuk-do, South Korea1 35.817 December16.82.1×
JeonjuJeollabuk-do, South Korea2 27.517 December13.02.1×
BusanBusan, South Korea1 28.517 December13.52.1×
GwangjuGyeonggi-do, South Korea1 38.820 December18.42.1×
KoesanNorth Chungcheong, South Korea1 37.917 December18.02.1×
NamyangjuGyeonggi-do, South Korea1 35.717 December17.02.1×
JangseongJeollanam-do, South Korea1 25.820 December12.32.1×
WanjuJeollabuk-do, South Korea1 27.617 December13.22.1×
MasanGwangju, South Korea1 31.820 December15.32.1×
JeongeupJeollabuk-do, South Korea1 29.717 December14.32.1×
Jeju CityJeju-do, South Korea1 25.117 December12.22.1×
PohangGyeongsangbuk-do, South Korea1 33.117 December16.22.0×
WŏnjuGangwon-do, South Korea1 40.719 December20.02.0×
Ganghwa-gunIncheon, South Korea2 36.216 December17.82.0×
HwacheonGangwon-do, South Korea1 25.818 December12.72.0×
JungpyongNorth Chungcheong, South Korea1 39.120 December19.32.0×
GwangjuGwangju, South Korea1 27.820 December13.92.0×

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 12 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, December 2025: 107 cities with PM2.5 at twice their usual or more, 16 to 20 December 2025, smogrank.com/episodes/2025-12-south-korea-3 (accessed 2 October 2026).

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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.