SmogRank / History / April 3, 2024
Most polluted cities on April 3, 2024
2,145 cities ranked by their average PM2.5 over the day; the worst was Mae Sai, Thailand, at 186.0 µg/m³. Each city's own local calendar day.
← Mae Sai 186.0 µg/m³
150 µg/m³15 WHO 24-hour guideline
- 1Mae SaiChiang Rai, Thailand 26112.4×
- 2N'DjamenaN’Djaména, Chad 25712.1×
- 3PhayaoPhayao, Thailand 2028.5×
- 4NanNan, Thailand 1978.1×
- 5Vientianelow-cost sensorsVientiane Prefecture, Laos 1947.8×
- 6Chiang MaiChiang Mai, Thailand 1927.6×
- 7LampangLampang, Thailand 1846.9×
- 8Piedras NegrasCoahuila, Mexico 1836.7×
- 9Kathmandulow-cost sensorsBagmati Province, Nepal 1826.6×
- 10UttaraditUttaradit, Thailand 1796.4×
- 11LamphunLamphun, Thailand 1796.3×
- 12PhraePhrae, Thailand 1725.7×
- 13Chiang RaiChiang Rai, Thailand 1725.7×
- 14LoeiLoei, Thailand 1725.7×
- 15SukhothaiSukhothai, Thailand 1685.3×
- 16KalasinKalasin, Thailand 1665.1×
- 17Kamphaeng PhetKamphaeng Phet, Thailand 1665.1×
- 18Udon ThaniUdon Thani, Thailand 1665.1×
- 19Lahorelow-cost sensorsPunjab, Pakistan 1645.0×
- 20PhetchabunPhetchabun, Thailand 1624.7×
- 21Chai NatChai Nat, Thailand 1614.7×
- 22ChaiyaphumChaiyaphum, Thailand 1614.6×
- 23TolucaMéxico, Mexico 1604.6×
- 24MukdahanMukdahan, Thailand 1604.6×
- 25Dhakalow-cost sensorsDhaka Division, Bangladesh 1604.5×
- 26PhichitPhichit, Thailand 1594.4×
- 27Khon KaenKhon Kaen, Thailand 1584.4×
- 28Nong Bua LamphuNong Bua Lamphu, Thailand 1584.4×
- 29CairoCairo, Egypt 1533.9×
- 30Mae SotTak, Thailand 1533.9×
- 31Nakhon SawanNakhon Sawan, Thailand 1523.8×
- 32Suphan BuriSuphan Buri, Thailand 1523.8×
- 33Sing BuriSing Buri, Thailand 1513.7×
- 34Sakon NakhonSakon Nakhon, Thailand 1493.7×
- 35DelhiDelhi, India 1483.6×
- 36Roi EtRoi Et, Thailand 1463.6×
- 37KolkataWest Bengal, India 1443.5×
- 38Lop BuriLopburi, Thailand 1433.5×
- 39HanoiHanoi, Vietnam 1413.4×
- 40BeijingBeijing, China 1413.4×
- 41Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan 1383.4×
- 42Ubon RatchathaniUbon Ratchathani, Thailand 1353.3×
- 43ManamaManama, Bahrain 1343.3×
- 44HyderabadTelangana, India 1313.2×
- 45YasothonYasothon, Thailand 1293.1×
- 46Nakhon RatchasimaNakhon Ratchasima, Thailand 1273.1×
- 47Amnat CharoenAmnat Charoen, Thailand 1273.1×
- 48BaghdadBaghdad, Iraq 1253.0×
- 49RabinalBaja Verapaz, Guatemala 1182.8×
- 50RatchaburiRatchaburi, Thailand 1152.7×
- 51Guatemala CityGuatemala, Guatemala 1132.7×
- 52Hua HinPrachuap Khiri Khan, Thailand 1112.6×
- 53Nakhon PathomNakhon Pathom, Thailand 1092.6×
- 54JakartaJakarta, Indonesia 1082.6×
- 55Puerto AysénAysén, Chile 1072.5×
- 56JeddahMecca Region, Saudi Arabia 1042.5×
- 57RanongRanong province, Thailand 1042.4×
- 58MumbaiMaharashtra, India 1032.4×
- 59Karachilow-cost sensorsSindh, Pakistan 1022.4×
- 60SalorTashkent Region, Uzbekistan 1022.4×
- 61HualquiBiobio, Chile 1002.4×
- 62Goyang-siGyeonggi-do, South Korea 992.3×
- 63Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand 982.3×
- 64PhetchaburiPhetchaburi, Thailand 982.3×
- 65Gimpo-siGyeonggi-do, South Korea 962.2×
- 66SaraburiSaraburi, Thailand 962.2×
- 67CoyhaiqueAysén, Chile 952.2×
- 68BelmopanCayo District, Belize 952.2×
- 69Addis AbabaAddis Ababa, Ethiopia 942.2×
- 70Ganghwa-gunIncheon, South Korea 942.1×
- 71ShulinTaipei, Taiwan 932.1×
- 72YuanlinTaiwan, Taiwan 932.1×
- 73Uijeongbu-siGyeonggi-do, South Korea 932.1×
- 73IncheonIncheon, South Korea 932.1×
- 75PhuketPhuket, Thailand 922.1×
- 76Mueang NonthaburiNonthaburi, Thailand 922.1×
- 76HsinchuTaiwan, Taiwan 922.1×
- 78ZhubeiTaiwan, Taiwan 922.1×
- 79Puerto VarasLos Lagos Region, Chile 922.1×
- 80Nong KhaemBangkok, Thailand 912.0×
- 81TaichungTaiwan, Taiwan 902.0×
- 81SalamancaGuanajuato, Mexico 902.0×
- 83ZhushanTaiwan, Taiwan 902.0×
- 83Bucheon-siGyeonggi-do, South Korea 902.0×
- 85Bang NaBangkok, Thailand 902.0×
- 86OsornoLos Lagos Region, Chile 892.0×
- 87Khlong LuangPathum Thani, Thailand 892.0×
- 88Buri RamBuriram, Thailand 881.9×
- 88Puente AltoSantiago Metropolitan, Chile 881.9×
- 90Ban Samae DamBangkok, Thailand 881.9×
- 91ToufenTaiwan, Taiwan 881.9×
- 91TaipeiTaiwan, Taiwan 881.9×
- 91TaoyuanTaiwan, Taiwan 881.9×
- 94DouliuTaiwan, Taiwan 881.9×
- 94Khlong Sam WaBangkok, Thailand 881.9×
- 96ErlinTaiwan, Taiwan 871.9×
- 97ErlunTaiwan, Taiwan 871.9×
- 97CelayaGuanajuato, Mexico 871.9×
- 97New Taipei CityTaipei, Taiwan 871.9×
- 100RancaguaO'Higgins Region, Chile 871.9×
- 101MiaoliTaiwan, Taiwan 871.9×
- 102Samut SakhonSamut Sakhon, Thailand 861.9×
- 102BangkokBangkok, Thailand 861.9×
- 104Si Maha PhotPrachin Buri, Thailand 861.9×
- 104SanzhiTaipei, Taiwan 861.9×
- 106MunsanGyeonggi-do, South Korea 861.9×
- 107TaibaoTaiwan, Taiwan 861.9×
- 108Phra PradaengSamut Prakan, Thailand 861.8×
- 109Nakhon NayokNakhon Nayok, Thailand 851.8×
- 110ChanghuaTaiwan, Taiwan 851.8×
- 111AstanaAstana, Kazakhstan 841.8×
- 111San CarlosÑuble, Chile 841.8×
- 113Chiayi CityTaiwan, Taiwan 841.8×
- 114NeiliTaiwan, Taiwan 841.8×
- 115Bang KapiBangkok, Thailand 831.8×
- 115XizhouTaiwan, Taiwan 831.8×
- 117ÖstersundJämtland, Sweden 831.8×
- 118YangonYangon, Myanmar 831.8×
- 119Islamabadlow-cost sensorsIslamabad, Pakistan 831.7×
- 119FengshanTakao, Taiwan 831.7×
- 119XizhiTaipei, Taiwan 831.7×
- 122RengoO'Higgins Region, Chile 821.7×
- 123Si Sa KetSi Sa Ket, Thailand 821.7×
- 123NantouTaiwan, Taiwan 821.7×
- 125Saphan SungBangkok, Thailand 811.7×
- 126YongkangTaiwan, Taiwan 811.7×
- 127Samut PrakanSamut Prakan, Thailand 811.7×
- 127NacimientoBiobio, Chile 811.7×
- 129DushanbeDushanbe, Tajikistan 811.7×
- 129TainanTaiwan, Taiwan 811.7×
- 129PuliTaiwan, Taiwan 811.7×
- 129ChaozhouTaiwan, Taiwan 811.7×
- 129HwadoGyeonggi-do, South Korea 811.7×
- 134ZhudongTaiwan, Taiwan 801.6×
- 134Ulan BatorUlaanbaatar, Mongolia 801.6×
- 136Sai MaiBangkok, Thailand 801.6×
- 137KaohsiungTakao, Taiwan 801.6×
- 137YangjuGyeonggi-do, South Korea 801.6×
- 137SantiagoSantiago Metropolitan, Chile 801.6×
- 137CoronelBiobio, Chile 801.6×
- 141Şabāḩ as SālimMubārak al Kabīr, Kuwait 801.6×
- 141HualpénBiobio, Chile 801.6×
- 143SokchoGangwon-do, South Korea 791.6×
- 143ChillánÑuble, Chile 791.6×
- 145SurinSurin, Thailand 791.6×
- 145Hwaseong-siGyeonggi-do, South Korea 791.6×
- 145TalcahuanoBiobio, Chile 791.6×
- 145Khan Na YaoBangkok, Thailand 791.6×
- 149Prachin BuriPrachin Buri, Thailand 781.6×
- 149BeigangTaiwan, Taiwan 781.6×
- 151Nong ChokBangkok, Thailand 781.6×
- 152Icheon-siGyeonggi-do, South Korea 771.6×
- 153JinchengFukien, Taiwan 771.5×
- 154YeojuGyeonggi-do, South Korea 771.5×
- 154NodaChiba, Japan 771.5×
- 154TemucoAraucania, Chile 771.5×
- 157Puerto MonttLos Lagos Region, Chile 761.5×
- 158YokotaTokyo, Japan 761.5×
- 159Bang Bo DistrictSamut Prakan, Thailand 751.5×
- 160AsakaSaitama, Japan 751.5×
- 160GwangmyeongGyeonggi-do, South Korea 751.5×
- 162Ban Khlong PrawetBangkok, Thailand 751.5×
- 163ShenyangLiaoning, China 751.5×
- 164SeoulSeoul, South Korea 751.5×
- 164KawaguchiSaitama, Japan 751.5×
- 166Novi PazarCentral Serbia, Serbia 741.4×
- 167Hualien CityTaiwan, Taiwan 741.4×
- 168GangneungGangwon-do, South Korea 741.4×
- 168IrumaSaitama, Japan 741.4×
- 170HengchunTaiwan, Taiwan 741.4×
- 171XinyingTaiwan, Taiwan 731.4×
- 171IgusaSaitama, Japan 731.4×
- 173PubalGyeonggi-do, South Korea 731.4×
- 174Yangp'yŏngGyeonggi-do, South Korea 731.4×
- 174Ansan-siGyeonggi-do, South Korea 731.4×
- 174OyamaTochigi, Japan 731.4×
- 174SaitamaSaitama, Japan 731.4×
- 178SantyokuGangwon-do, South Korea 731.4×
- 179Misato, SaitamaSaitama, Japan 731.4×
- 180BakuBaki, Azerbaijan 721.4×
- 180Surat ThaniSurat Thani, Thailand 721.4×
- 182TokorozawaSaitama, Japan 721.4×
- 182KukichūōSaitama, Japan 721.4×
- 182KasukabeSaitama, Japan 721.4×
- 185Guri-siGyeonggi-do, South Korea 721.4×
- 186HamarInnlandet, Norway 721.4×
- 186SarajevoFederation of B&H, Bosnia and Herzegovina 721.4×
- 186FuchūTokyo, Japan 721.4×
- 189MagongTaiwan, Taiwan 721.3×
- 189ValdiviaLos Ríos Region, Chile 721.3×
- 191HannōSaitama, Japan 711.3×
- 191QuinteroValparaiso, Chile 711.3×
- 191San Pedro de la PazBiobio, Chile 711.3×
- 191TsuchiuraIbaraki, Japan 711.3×
- 195AshgabatAshgabat, Turkmenistan 711.3×
- 195IshinomakiMiyagi, Japan 711.3×
- 197AgeoSaitama, Japan 711.3×
- 197TocopillaAntofagasta, Chile 711.3×
- 197NiizaSaitama, Japan 711.3×
- 200KeelungTaiwan, Taiwan 711.3×
Top 200 of 2,145 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, April 3, 2024, smogrank.com/history/2024-04-03 (accessed 3 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.