SmogRank / History / January 31, 2025
Most polluted cities on January 31, 2025
2,284 cities ranked by their average PM2.5 over the day; the worst was Lahore, Pakistan, at 217.0 µg/m³. Each city's own local calendar day.
- Western United States, January and February 202529 January to 2 February 2025, 5 days26 cities38Woodburn
- Japan, January and February 202531 January to 1 February 2025, 2 days110 cities38Yawata
Bad-air episodes during January 31, 2025. All episodes.
← Lahore 217.0 µg/m³
200 µg/m³15 WHO 24-hour guideline
- 1Lahorelow-cost sensorsPunjab, Pakistan 29214.5×
- 2DelhiDelhi, India 25812.2×
- 3Dhakalow-cost sensorsDhaka Division, Bangladesh 2078.8×
- 4NegotinCentral Serbia, Serbia 2028.5×
- 5Kampalalow-cost sensorsCentral Region, Uganda 2018.4×
- 6DushanbeDushanbe, Tajikistan 1968.0×
- 7Ulan BatorUlaanbaatar, Mongolia 1796.3×
- 8KolkataWest Bengal, India 1766.1×
- 9Yerevanlow-cost sensorsYerevan, Armenia 1715.6×
- 10Kathmandulow-cost sensorsBagmati Province, Nepal 1675.3×
- 11PhetchaburiPhetchaburi, Thailand 1665.1×
- 12CodleaBrașov County, Romania 1655.0×
- 13ShenyangLiaoning, China 1645.0×
- 14TratTrat, Thailand 1634.8×
- 15KigaliKigali, Rwanda 1614.7×
- 16Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan 1604.6×
- 17Şabāḩ as SālimMubārak al Kabīr, Kuwait 1604.6×
- 17KraljevoCentral Serbia, Serbia 1604.6×
- 19Nong KhaemBangkok, Thailand 1604.5×
- 21RatchaburiRatchaburi, Thailand 1594.4×
- 22ValjevoCentral Serbia, Serbia 1594.4×
- 23SukhothaiSukhothai, Thailand 1584.4×
- 24Ban Talat BuengChon Buri, Thailand 1574.2×
- 24Abujalow-cost sensorsFCT, Nigeria 1574.2×
- 26DejCluj County, Romania 1564.2×
- 27Bang NaBangkok, Thailand 1564.2×
- 28Bueng KumBangkok, Thailand 1564.1×
- 28Khlong Sam WaBangkok, Thailand 1564.1×
- 30ČačakCentral Serbia, Serbia 1554.1×
- 31HyderabadTelangana, India 1554.1×
- 32Lat KrabangBangkok, Thailand 1554.1×
- 33Khan Na YaoBangkok, Thailand 1554.0×
- 34PirotCentral Serbia, Serbia 1544.0×
- 35YasothonYasothon, Thailand 1544.0×
- 36Islamabadlow-cost sensorsIslamabad, Pakistan 1533.9×
- 37SmederevoCentral Serbia, Serbia 1533.9×
- 38Banja LukaSrpska, Bosnia and Herzegovina 1533.9×
- 39Ban Samae DamBangkok, Thailand 1523.8×
- 40NanNan, Thailand 1523.8×
- 40Nakhon PathomNakhon Pathom, Thailand 1523.8×
- 42Bang KapiBangkok, Thailand 1523.8×
- 43PančevoVojvodina, Serbia 1523.8×
- 44NišCentral Serbia, Serbia 1523.8×
- 45Karachilow-cost sensorsSindh, Pakistan 1523.8×
- 46ZemunCentral Serbia, Serbia 1513.7×
- 47Ban Khlong PrawetBangkok, Thailand 1513.7×
- 48Lak SiBangkok, Thailand 1513.7×
- 49Khlong LuangPathum Thani, Thailand 1503.7×
- 50KalasinKalasin, Thailand 1493.7×
- 50Ban PhaeoSamut Sakhon, Thailand 1493.7×
- 50N'DjamenaN’Djaména, Chad 1493.7×
- 53LazarevacCentral Serbia, Serbia 1473.6×
- 54Saphan SungBangkok, Thailand 1463.6×
- 55BangkokBangkok, Thailand 1463.6×
- 56Istanbullow-cost sensorsIstanbul, Turkey 1453.6×
- 56Nong ChokBangkok, Thailand 1453.6×
- 58Phra PradaengSamut Prakan, Thailand 1443.5×
- 59BeijingBeijing, China 1443.5×
- 60Sing BuriSing Buri, Thailand 1433.5×
- 61Nakhon LuangPhra Nakhon Si Ayutthaya, Thailand 1423.5×
- 62Si Maha PhotPrachin Buri, Thailand 1413.4×
- 63Mueang NonthaburiNonthaburi, Thailand 1413.4×
- 64Ubon RatchathaniUbon Ratchathani, Thailand 1403.4×
- 65KragujevacCentral Serbia, Serbia 1393.4×
- 66Lop BuriLopburi, Thailand 1393.4×
- 67MukdahanMukdahan, Thailand 1373.3×
- 68Abidjanlow-cost sensorsAbidjan Autonomous District, Ivory Coast 1363.3×
- 69ObrenovacCentral Serbia, Serbia 1363.3×
- 70Mae SaiChiang Rai, Thailand 1353.3×
- 71Sai MaiBangkok, Thailand 1343.3×
- 72RayongRayong, Thailand 1333.2×
- 73MumbaiMaharashtra, India 1323.2×
- 73PhichitPhichit, Thailand 1323.2×
- 75AranyaprathetSa Kaeo, Thailand 1303.2×
- 76PhayaoPhayao, Thailand 1283.1×
- 77Maha SarakhamMaha Sarakham, Thailand 1283.1×
- 78Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand 1273.1×
- 79UttaraditUttaradit, Thailand 1273.1×
- 80BelgradeCentral Serbia, Serbia 1263.0×
- 81MiskolcBorsod-Abaúj-Zemplén, Hungary 1253.0×
- 81Laem ChabangChon Buri, Thailand 1253.0×
- 83Cluj-NapocaCluj County, Romania 1253.0×
- 84PhraePhrae, Thailand 1243.0×
- 84Nakhon RatchasimaNakhon Ratchasima, Thailand 1243.0×
- 86CairoCairo, Egypt 1243.0×
- 86LampangLampang, Thailand 1243.0×
- 88Bang Bo DistrictSamut Prakan, Thailand 1243.0×
- 89LoeiLoei, Thailand 1233.0×
- 90Roi EtRoi Et, Thailand 1233.0×
- 90Santa CatarinaNuevo León, Mexico 1233.0×
- 92Samut PrakanSamut Prakan, Thailand 1233.0×
- 93BihaćFederation of B&H, Bosnia and Herzegovina 1222.9×
- 94ChumphonChumphon, Thailand 1222.9×
- 94Prachin BuriPrachin Buri, Thailand 1222.9×
- 94ŻywiecSilesia, Poland 1222.9×
- 97Ban ChangRayong, Thailand 1222.9×
- 98SremčicaCentral Serbia, Serbia 1212.9×
- 99KazincbarcikaBorsod-Abaúj-Zemplén, Hungary 1182.8×
- 100Mae SotTak, Thailand 1152.7×
- 101Chai NatChai Nat, Thailand 1152.7×
- 102Tomaszów LubelskiLublin, Poland 1152.7×
- 103ChanthaburiChanthaburi, Thailand 1142.7×
- 104SarajevoFederation of B&H, Bosnia and Herzegovina 1132.7×
- 105Chiayi CityTaiwan, Taiwan 1132.7×
- 106SalorTashkent Region, Uzbekistan 1132.7×
- 107PhetchabunPhetchabun, Thailand 1122.7×
- 108SurinSurin, Thailand 1122.7×
- 109UžiceCentral Serbia, Serbia 1102.6×
- 109Novi SadVojvodina, Serbia 1102.6×
- 111SaraburiSaraburi, Thailand 1092.6×
- 112NyíregyházaSzabolcs-Szatmár-Bereg, Hungary 1092.6×
- 112Amnat CharoenAmnat Charoen, Thailand 1092.6×
- 114HongseongChungcheongnam-do, South Korea 1092.6×
- 115Udon ThaniUdon Thani, Thailand 1092.6×
- 116Chiang RaiChiang Rai, Thailand 1082.6×
- 117KłodzkoLower Silesia, Poland 1072.5×
- 118Nakhon SawanNakhon Sawan, Thailand 1062.5×
- 119Nong Bua LamphuNong Bua Lamphu, Thailand 1052.5×
- 120ChaiyaphumChaiyaphum, Thailand 1042.5×
- 121Tottori-shiTottori, Japan 1042.4×
- 122SakaiminatoTottori, Japan 1032.4×
- 123DouliuTaiwan, Taiwan 1032.4×
- 124SeonghwanChungcheongnam-do, South Korea 1022.4×
- 125AsanChungcheongnam-do, South Korea 1022.4×
- 126LamphunLamphun, Thailand 1012.4×
- 127BuyeoChungcheongnam-do, South Korea 1002.4×
- 127NabariMie, Japan 1002.4×
- 129Chiang MaiChiang Mai, Thailand 992.3×
- 130BaghdadBaghdad, Iraq 992.3×
- 131WŏnjuGangwon-do, South Korea 992.3×
- 132XinyingTaiwan, Taiwan 982.3×
- 133KōtariKyoto, Japan 982.3×
- 134Accralow-cost sensorsGreater Accra, Ghana 982.3×
- 136HanoiHanoi, Vietnam 972.2×
- 136KyōtangoKyoto, Japan 972.2×
- 138YeongjuGyeongsangbuk-do, South Korea 972.2×
- 138YŏnmuChungcheongnam-do, South Korea 972.2×
- 140KariyaHyōgo, Japan 962.2×
- 141Cheongju-siNorth Chungcheong, South Korea 962.2×
- 142YesanChungcheongnam-do, South Korea 962.2×
- 142HanfordCalifornia, United States 962.2×
- 144AridaWakayama, Japan 962.2×
- 145TainanTaiwan, Taiwan 952.2×
- 145KaohsiungTakao, Taiwan 952.2×
- 145HamarInnlandet, Norway 952.2×
- 148YawataKyoto, Japan 952.2×
- 149Skarżysko-KamiennaŚwiętokrzyskie, Poland 952.2×
- 149PubalGyeonggi-do, South Korea 952.2×
- 151SeosanChungcheongnam-do, South Korea 952.2×
- 151YonagoTottori, Japan 952.2×
- 153Buri RamBuriram, Thailand 942.2×
- 153HigashinozoeHyōgo, Japan 942.2×
- 155Hua HinPrachuap Khiri Khan, Thailand 942.2×
- 156Sakon NakhonSakon Nakhon, Thailand 942.1×
- 156FengshanTakao, Taiwan 942.1×
- 156JōyōKyoto, Japan 942.1×
- 160MiyazuKyoto, Japan 942.1×
- 160LučenecBanská Bystrica Region, Slovakia 942.1×
- 162YongkangTaiwan, Taiwan 932.1×
- 162UjiKyoto, Japan 932.1×
- 164BoryeongChungcheongnam-do, South Korea 932.1×
- 164AioiHyōgo, Japan 932.1×
- 166KourouGuyane, French Guiana 932.1×
- 167GimcheonGyeongsangbuk-do, South Korea 932.1×
- 167KameokaKyoto, Japan 932.1×
- 167SejongSejong-si, South Korea 932.1×
- 170ZhushanTaiwan, Taiwan 922.1×
- 170ChaozhouTaiwan, Taiwan 922.1×
- 170TenriNara, Japan 922.1×
- 173YangonYangon, Myanmar 922.1×
- 173FutogVojvodina, Serbia 922.1×
- 175KusatsuShiga, Japan 922.1×
- 175SugaiKyoto, Japan 922.1×
- 175KizugawaKyoto, Japan 922.1×
- 178YaoOsaka, Japan 922.1×
- 178HigashiosakaOsaka, Japan 922.1×
- 180Ueno-ebisumachiMie, Japan 922.1×
- 181CraiovaDolj, Romania 912.1×
- 181DębicaSubcarpathia, Poland 912.1×
- 181YuanlinTaiwan, Taiwan 912.1×
- 181ChungjuNorth Chungcheong, South Korea 912.1×
- 181SandachōHyōgo, Japan 912.1×
- 181ChiguayanteBiobio, Chile 912.1×
- 187MaderaCalifornia, United States 912.0×
- 188AmagasakiHyōgo, Japan 912.0×
- 188IgaMie, Japan 912.0×
- 190TakahashiOkayama, Japan 902.0×
- 190KurayoshiTottori, Japan 902.0×
- 190YonoOsaka, Japan 902.0×
- 193TangjinChungcheongnam-do, South Korea 902.0×
- 193KyotoKyoto, Japan 902.0×
- 195AugustówPodlasie, Poland 902.0×
- 195Yangp'yŏngGyeonggi-do, South Korea 902.0×
- 195CheonanChungcheongnam-do, South Korea 902.0×
- 195Chinch'ŏnNorth Chungcheong, South Korea 902.0×
- 199YoukaichiShiga, Japan 902.0×
- 200Bishkeklow-cost sensorsBishkek, Kyrgyzstan 902.0×
Top 200 of 2,284 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
Not covered: the government monitoring networks of China and Turkey, which publish no terms that let us reuse their readings. Most cities there are missing from this board, not clean. Why.
Use this board
SmogRank, most polluted cities, PM2.5, January 31, 2025, smogrank.com/history/2025-01-31 (accessed 2 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.