SmogRank / History / January 21, 2025
Most polluted cities on January 21, 2025
2,224 cities ranked by their average PM2.5 over the day; the worst was Sarajevo, Bosnia and Herzegovina, at 252.0 µg/m³. Each city's own local calendar day.
- Japan and South Korea, January 202517 to 24 January 2025, 8 days274 cities117Yeoju
- Western United States, January 202518 to 24 January 2025, 7 days19 cities61Oxnard
- Central Europe, January 202514 to 23 January 2025, 10 days383 cities252Sarajevo
- Taiwan, January 202521 to 22 January 2025, 2 days22 cities55Yuanlin
Bad-air episodes during January 21, 2025. All episodes.
← Sarajevo 252.0 µg/m³
200 µg/m³15 WHO 24-hour guideline
- 1SarajevoFederation of B&H, Bosnia and Herzegovina 35416.8×
- 2Dhakalow-cost sensorsDhaka Division, Bangladesh 34616.5×
- 3NegotinCentral Serbia, Serbia 27413.3×
- 4Novi PazarCentral Serbia, Serbia 27313.2×
- 5KolkataWest Bengal, India 26412.6×
- 6NišCentral Serbia, Serbia 2149.3×
- 7DelhiDelhi, India 2119.1×
- 8Karachilow-cost sensorsSindh, Pakistan 2109.0×
- 9Lahorelow-cost sensorsPunjab, Pakistan 2098.9×
- 10Ulan BatorUlaanbaatar, Mongolia 1988.1×
- 10UžiceCentral Serbia, Serbia 1988.1×
- 12YeojuGyeonggi-do, South Korea 1947.8×
- 13Tomaszów LubelskiLublin, Poland 1937.7×
- 14CodleaBrașov County, Romania 1927.6×
- 15Yangp'yŏngGyeonggi-do, South Korea 1907.4×
- 16PubalGyeonggi-do, South Korea 1897.3×
- 17Icheon-siGyeonggi-do, South Korea 1897.3×
- 18HanoiHanoi, Vietnam 1867.0×
- 19Kathmandulow-cost sensorsBagmati Province, Nepal 1857.0×
- 20PyeongtaekGyeonggi-do, South Korea 1846.9×
- 21PirotCentral Serbia, Serbia 1846.8×
- 22AnseongGyeonggi-do, South Korea 1836.7×
- 23ŻywiecSilesia, Poland 1826.7×
- 24Liptovský Mikulᚎilina Region, Slovakia 1826.6×
- 25OsanGyeonggi-do, South Korea 1816.6×
- 26SeonghwanChungcheongnam-do, South Korea 1806.5×
- 27MumbaiMaharashtra, India 1806.5×
- 28Banja LukaSrpska, Bosnia and Herzegovina 1806.4×
- 29Guri-siGyeonggi-do, South Korea 1786.3×
- 30Chinch'ŏnNorth Chungcheong, South Korea 1786.2×
- 31JungpyongNorth Chungcheong, South Korea 1776.2×
- 32SeoulSeoul, South Korea 1776.2×
- 33WabuGyeonggi-do, South Korea 1766.1×
- 34HwadoGyeonggi-do, South Korea 1766.0×
- 35N'DjamenaN’Djaména, Chad 1756.0×
- 36WŏnjuGangwon-do, South Korea 1756.0×
- 37SuwonGyeonggi-do, South Korea 1756.0×
- 38ZamośćLublin, Poland 1745.9×
- 39GwangmyeongGyeonggi-do, South Korea 1745.9×
- 40Cheongju-siNorth Chungcheong, South Korea 1745.9×
- 41Hongch’ŏnGangwon-do, South Korea 1745.9×
- 42Goyang-siGyeonggi-do, South Korea 1745.9×
- 43YangjuGyeonggi-do, South Korea 1735.8×
- 44ČačakCentral Serbia, Serbia 1735.8×
- 44ChuncheonGangwon-do, South Korea 1735.8×
- 46Seongnam-siGyeonggi-do, South Korea 1735.7×
- 47Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan 1725.7×
- 48GapyeongGyeonggi-do, South Korea 1725.7×
- 49Kampalalow-cost sensorsCentral Region, Uganda 1725.7×
- 50KraljevoCentral Serbia, Serbia 1725.7×
- 51Abujalow-cost sensorsFCT, Nigeria 1715.6×
- 52HyderabadTelangana, India 1715.6×
- 53GwangjuGyeonggi-do, South Korea 1715.6×
- 54ChungjuNorth Chungcheong, South Korea 1715.6×
- 55Uijeongbu-siGyeonggi-do, South Korea 1705.6×
- 56DushanbeDushanbe, Tajikistan 1705.5×
- 57Anyang-siGyeonggi-do, South Korea 1705.5×
- 58MunsanGyeonggi-do, South Korea 1705.5×
- 59YŏnmuChungcheongnam-do, South Korea 1695.4×
- 60KoesanNorth Chungcheong, South Korea 1695.4×
- 61AsanChungcheongnam-do, South Korea 1685.4×
- 62LublinLublin, Poland 1685.3×
- 63ShanghaiShanghai, China 1685.3×
- 64SejongSejong-si, South Korea 1685.3×
- 65Gimpo-siGyeonggi-do, South Korea 1675.2×
- 66Nong KhaemBangkok, Thailand 1675.2×
- 66NamyangjuGyeonggi-do, South Korea 1675.2×
- 68KinzanChungcheongnam-do, South Korea 1675.2×
- 69NiskoSubcarpathia, Poland 1675.2×
- 70Bucheon-siGyeonggi-do, South Korea 1665.2×
- 71OkcheonNorth Chungcheong, South Korea 1665.1×
- 72ChennaiTamil Nadu, India 1665.1×
- 73YeongjuGyeongsangbuk-do, South Korea 1655.1×
- 74YesanChungcheongnam-do, South Korea 1655.0×
- 75TangjinChungcheongnam-do, South Korea 1655.0×
- 76Skarżysko-KamiennaŚwiętokrzyskie, Poland 1655.0×
- 77IksanJeollabuk-do, South Korea 1645.0×
- 78CheonanChungcheongnam-do, South Korea 1645.0×
- 79Islamabadlow-cost sensorsIslamabad, Pakistan 1644.9×
- 80ValjevoCentral Serbia, Serbia 1644.9×
- 81KielceŚwiętokrzyskie, Poland 1644.9×
- 81KimjeJeollabuk-do, South Korea 1644.9×
- 83Ansan-siGyeonggi-do, South Korea 1644.9×
- 84KrotoszynGreater Poland, Poland 1634.8×
- 85CheorwonGangwon-do, South Korea 1624.8×
- 86Ban Samae DamBangkok, Thailand 1624.7×
- 86GunsanJeollabuk-do, South Korea 1624.7×
- 88HayangGyeongsangbuk-do, South Korea 1624.7×
- 89StarachowiceŚwiętokrzyskie, Poland 1624.7×
- 90Almatylow-cost sensorsAlmaty, Kazakhstan 1614.7×
- 91NonsanChungcheongnam-do, South Korea 1614.7×
- 92Khan Na YaoBangkok, Thailand 1614.7×
- 93Khlong Sam WaBangkok, Thailand 1614.6×
- 94GumiGyeongsangbuk-do, South Korea 1604.6×
- 95WanjuJeollabuk-do, South Korea 1604.5×
- 95HanamGyeonggi-do, South Korea 1604.5×
- 97RzeszówSubcarpathia, Poland 1604.5×
- 98Hwaseong-siGyeonggi-do, South Korea 1604.5×
- 99NamsaJeollabuk-do, South Korea 1594.5×
- 100YeongdongNorth Chungcheong, South Korea 1594.5×
- 101Bueng KumBangkok, Thailand 1594.4×
- 102Lat KrabangBangkok, Thailand 1594.4×
- 103BuyeoChungcheongnam-do, South Korea 1594.4×
- 103RužomberokŽilina Region, Slovakia 1594.4×
- 105SangjuGyeongsangbuk-do, South Korea 1584.4×
- 106HongseongChungcheongnam-do, South Korea 1584.3×
- 107BoryeongChungcheongnam-do, South Korea 1574.3×
- 108PohangGyeongsangbuk-do, South Korea 1574.2×
- 109Bang KapiBangkok, Thailand 1574.2×
- 109Gyeongsan-siGyeongsangbuk-do, South Korea 1574.2×
- 109Lak SiBangkok, Thailand 1574.2×
- 112ConakryConakry, Guinea 1564.2×
- 113MungyeongGyeongsangbuk-do, South Korea 1564.2×
- 113IncheonIncheon, South Korea 1564.2×
- 115DaejeonDaejeon, South Korea 1564.2×
- 116DębicaSubcarpathia, Poland 1564.2×
- 116JeonjuJeollabuk-do, South Korea 1564.2×
- 116Kinshasalow-cost sensorsKinshasa, Democratic Republic of the Congo 1564.2×
- 119OtwockMazovia, Poland 1564.2×
- 120BuanJeollabuk-do, South Korea 1564.1×
- 121Bang NaBangkok, Thailand 1554.1×
- 122GongjuChungcheongnam-do, South Korea 1554.1×
- 123Botevgradlow-cost sensorsSofia, Bulgaria 1554.1×
- 124HwacheonGangwon-do, South Korea 1554.1×
- 125KigaliKigali, Rwanda 1554.1×
- 126Ganghwa-gunIncheon, South Korea 1554.1×
- 127LyonAuvergne-Rhône-Alpes, France 1554.0×
- 128EisenGyeongsangbuk-do, South Korea 1554.0×
- 129GijangBusan, South Korea 1544.0×
- 130Nong ChokBangkok, Thailand 1544.0×
- 130Ban Khlong PrawetBangkok, Thailand 1544.0×
- 132Jinan-gunJeollabuk-do, South Korea 1544.0×
- 133GyeongjuGyeongsangbuk-do, South Korea 1544.0×
- 133CeljeUrban Municipality of Celje, Slovenia 1544.0×
- 135ChangsuJeollabuk-do, South Korea 1544.0×
- 135ZgierzŁódź Voivodeship, Poland 1544.0×
- 138AndongGyeongsangbuk-do, South Korea 1544.0×
- 139LazarevacCentral Serbia, Serbia 1543.9×
- 140UlsanUlsan, South Korea 1543.9×
- 141BangkokBangkok, Thailand 1533.9×
- 141Sai MaiBangkok, Thailand 1533.9×
- 143KragujevacCentral Serbia, Serbia 1533.9×
- 143KrakówLesser Poland, Poland 1533.9×
- 145BusanBusan, South Korea 1533.9×
- 146DaeguDaegu, South Korea 1533.9×
- 147GimcheonGyeongsangbuk-do, South Korea 1533.9×
- 148WaegwanGyeongsangbuk-do, South Korea 1533.9×
- 148KunwiGyeongsangbuk-do, South Korea 1533.9×
- 150UngsangGyeongsangnam-do, South Korea 1533.8×
- 151SeosanChungcheongnam-do, South Korea 1523.8×
- 151Bielsko-BialaSilesia, Poland 1523.8×
- 153Gabrovolow-cost sensorsGabrovo, Bulgaria 1523.8×
- 154PrzemyślSubcarpathia, Poland 1523.8×
- 155ImsilJeollabuk-do, South Korea 1523.8×
- 155TongyeongGyeongsangnam-do, South Korea 1523.8×
- 157HwawŏnDaegu, South Korea 1513.7×
- 158NeietsuGangwon-do, South Korea 1513.7×
- 159GuangzhouGuangdong, China 1513.7×
- 160SremčicaCentral Serbia, Serbia 1513.7×
- 161Mueang NonthaburiNonthaburi, Thailand 1513.7×
- 161YangguGangwon-do, South Korea 1513.7×
- 163ObrenovacCentral Serbia, Serbia 1503.7×
- 164YeonilGyeongsangbuk-do, South Korea 1493.7×
- 164TrbovljeMunicipality of Trbovlje, Slovenia 1493.7×
- 164MariborUrban Municipality of Maribor, Slovenia 1493.7×
- 167MasanGwangju, South Korea 1493.7×
- 168NaesŏGyeongsangnam-do, South Korea 1483.6×
- 168JeongeupJeollabuk-do, South Korea 1483.6×
- 170CiechanówMazovia, Poland 1473.6×
- 171SantyokuGangwon-do, South Korea 1473.6×
- 172ThessaloníkiCentral Macedonia, Greece 1463.6×
- 173KimhaeGyeongsangnam-do, South Korea 1463.6×
- 174BihaćFederation of B&H, Bosnia and Herzegovina 1453.6×
- 175RadomMazovia, Poland 1453.6×
- 175ZemunCentral Serbia, Serbia 1453.6×
- 175MurciaMurcia, Spain 1453.6×
- 178BaghdadBaghdad, Iraq 1443.5×
- 179YecheonGyeongsangbuk-do, South Korea 1443.5×
- 180YeosuJeollanam-do, South Korea 1443.5×
- 181SmederevoCentral Serbia, Serbia 1433.5×
- 181KranjUrban Municipality of Kranj, Slovenia 1433.5×
- 183Dimitrovgradlow-cost sensorsHaskovo, Bulgaria 1423.5×
- 183Cheongsong gunGyeongsangbuk-do, South Korea 1423.5×
- 185ChinjuGyeongsangnam-do, South Korea 1413.5×
- 186Sevlievolow-cost sensorsGabrovo, Bulgaria 1413.4×
- 186MiryangGyeongsangnam-do, South Korea 1413.4×
- 186SallanchesAuvergne-Rhône-Alpes, France 1413.4×
- 189ĆuprijaCentral Serbia, Serbia 1413.4×
- 189NajuJeollanam-do, South Korea 1413.4×
- 191DamyangJeollanam-do, South Korea 1403.4×
- 192ŻyrardówMazovia, Poland 1403.4×
- 192GwangjuGwangju, South Korea 1403.4×
- 194WłocławekKujawsko-Pomorskie, Poland 1393.4×
- 195MiskolcBorsod-Abaúj-Zemplén, Hungary 1393.4×
- 195PtujUrban Municipality of Ptuj, Slovenia 1393.4×
- 197ChangnyeongGyeongsangnam-do, South Korea 1393.4×
- 198PruszkówMazovia, Poland 1383.4×
- 199YangsanGyeongsangnam-do, South Korea 1373.4×
- 200LubańLower Silesia, Poland 1373.3×
Top 200 of 2,224 shown.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
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SmogRank, most polluted cities, PM2.5, January 21, 2025, smogrank.com/history/2025-01-21 (accessed 2 Oct 2026).
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