SmogRank / History / April 3, 2023

Most polluted cities on April 3, 2023

1,512 cities ranked by their average PM2.5 over the day; the worst was Reykjavík, Iceland, at 330.1 µg/m³. Each city's own local calendar day.

← Reykjavík 330.1 µg/m³ 300 µg/m³15 WHO 24-hour guideline
Every city ranked for April 3, 2023, one column each, worst on the left and cleanest on the right; height is PM2.5 in µg/m³. Point at it to read a city; tap to open it.
  1. 1ReykjavíkCapital Region, Iceland
    500+22.0×
  2. 2Mae SaiChiang Rai, Thailand
    24711.5×
  3. 3Ban HouakhouaBokeo, Laos
    2199.6×
  4. 4N'DjamenaN’Djaména, Chad
    2018.4×
  5. 5Chiang RaiChiang Rai, Thailand
    1998.3×
  6. 6PhayaoPhayao, Thailand
    1816.6×
  7. 7BamakoBamako, Mali
    1816.5×
  8. 8Chiang MaiChiang Mai, Thailand
    1806.5×
  9. 9NanNan, Thailand
    1756.0×
  10. 10Dhakalow-cost sensorsDhaka Division, Bangladesh
    1705.5×
  11. 11LoeiLoei, Thailand
    1695.4×
  12. 12LampangLampang, Thailand
    1665.1×
  13. 13TlaquepaqueJalisco, Mexico
    1655.1×
  14. 14LamphunLamphun, Thailand
    1634.8×
  15. 15Puerto MonttLos Lagos Region, Chile
    1574.3×
  16. 16Kamphaeng PhetKamphaeng Phet, Thailand
    1564.2×
  17. 17PhraePhrae, Thailand
    1564.2×
  18. 18UttaraditUttaradit, Thailand
    1543.9×
  19. 19DelhiDelhi, India
    1533.9×
  20. 20ShenyangLiaoning, China
    1523.8×
  21. 21Ciudad Benito JuárezNuevo León, Mexico
    1513.7×
  22. 22BrawleyCalifornia, United States
    1463.6×
  23. 23PhichitPhichit, Thailand
    1443.5×
  24. 24Puerto AysénAysén, Chile
    1423.5×
  25. 25JakartaJakarta, Indonesia
    1423.5×
  26. 26Ga-RankuwaNorth West, South Africa
    1413.4×
  27. 27Lahorelow-cost sensorsPunjab, Pakistan
    1383.4×
  28. 28Mae SotTak, Thailand
    1363.3×
  29. 29CholulaPuebla, Mexico
    1363.3×
  30. 30Ubon RatchathaniUbon Ratchathani, Thailand
    1313.2×
  31. 31BeijingBeijing, China
    1303.2×
  32. 32PhetchabunPhetchabun, Thailand
    1283.1×
  33. 33AlexandriaAlexandria, Egypt
    1283.1×
  34. 34OsornoLos Lagos Region, Chile
    1273.1×
  35. 35Tha BoNong Khai, Thailand
    1243.0×
  36. 36MexicaliBaja California, Mexico
    1212.9×
  37. 36CelayaGuanajuato, Mexico
    1212.9×
  38. 38SukhothaiSukhothai, Thailand
    1202.9×
  39. 38Sing BuriSing Buri, Thailand
    1202.9×
  40. 40San Mateo AtencoMéxico, Mexico
    1202.9×
  41. 41Puerto VarasLos Lagos Region, Chile
    1192.9×
  42. 42Suphan BuriSuphan Buri, Thailand
    1192.9×
  43. 43BaghdadBaghdad, Iraq
    1182.8×
  44. 44Lop BuriLopburi, Thailand
    1172.8×
  45. 45Nong Bua LamphuNong Bua Lamphu, Thailand
    1122.7×
  46. 45Nakhon SawanNakhon Sawan, Thailand
    1122.7×
  47. 47Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1112.6×
  48. 48RatchaburiRatchaburi, Thailand
    1102.6×
  49. 49San Salvador TizatlalliMéxico, Mexico
    1082.6×
  50. 50Abujalow-cost sensorsFCT, Nigeria
    1082.6×
  51. 51Udon ThaniUdon Thani, Thailand
    1072.5×
  52. 52HyderabadTelangana, India
    1062.5×
  53. 52Tepeji del Río de OcampoHidalgo, Mexico
    1062.5×
  54. 54Samut PrakanSamut Prakan, Thailand
    1042.4×
  55. 54TolucaMéxico, Mexico
    1042.4×
  56. 56XonacatlánMéxico, Mexico
    1032.4×
  57. 57Si Maha PhotPrachin Buri, Thailand
    1022.4×
  58. 58RabinalBaja Verapaz, Guatemala
    1012.4×
  59. 58Guatemala CityGuatemala, Guatemala
    1012.4×
  60. 60SofiaSofia-Capital, Bulgaria
    1012.4×
  61. 61YumaArizona, United States
    1002.4×
  62. 62KalasinKalasin, Thailand
    992.3×
  63. 63San Francisco TlalcilalcalpanMéxico, Mexico
    992.3×
  64. 64Nakhon RatchasimaNakhon Ratchasima, Thailand
    982.3×
  65. 65Roi EtRoi Et, Thailand
    982.3×
  66. 66Nong KhaemBangkok, Thailand
    972.3×
  67. 67Bang NaBangkok, Thailand
    972.2×
  68. 68Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    962.2×
  69. 69ChaiyaphumChaiyaphum, Thailand
    962.2×
  70. 69PakxanBolikhamsai, Laos
    962.2×
  71. 71KanchanaburiKanchanaburi, Thailand
    962.2×
  72. 72GuangzhouGuangdong, China
    962.2×
  73. 73Khon KaenKhon Kaen, Thailand
    952.2×
  74. 74Almatylow-cost sensorsAlmaty, Kazakhstan
    942.2×
  75. 75HanoiHanoi, Vietnam
    942.1×
  76. 76Si Sa KetSi Sa Ket, Thailand
    932.1×
  77. 77Ban Samae DamBangkok, Thailand
    932.1×
  78. 78Nakhon PathomNakhon Pathom, Thailand
    932.1×
  79. 78La UniónLos Ríos Region, Chile
    932.1×
  80. 80Sakon NakhonSakon Nakhon, Thailand
    922.1×
  81. 80Ciudad JuárezChihuahua, Mexico
    922.1×
  82. 82Khlong Sam WaBangkok, Thailand
    922.1×
  83. 83Ciudad NezahualcoyotlMéxico, Mexico
    912.1×
  84. 83CalexicoCalifornia, United States
    912.1×
  85. 85SalorTashkent Region, Uzbekistan
    912.0×
  86. 86San Andrés TuxtlaVeracruz, Mexico
    902.0×
  87. 87Buri RamBuriram, Thailand
    902.0×
  88. 87Ciudad ApodacaNuevo León, Mexico
    902.0×
  89. 89PueblaPuebla, Mexico
    892.0×
  90. 90VeracruzVeracruz, Mexico
    892.0×
  91. 91ValjevoCentral Serbia, Serbia
    881.9×
  92. 91MonterreyNuevo León, Mexico
    881.9×
  93. 93CoyhaiqueAysén, Chile
    881.9×
  94. 94Lak SiBangkok, Thailand
    881.9×
  95. 95BangkokBangkok, Thailand
    881.9×
  96. 95Viña del MarValparaiso, Chile
    881.9×
  97. 97QuinteroValparaiso, Chile
    881.9×
  98. 97QuillotaValparaiso, Chile
    881.9×
  99. 99Mexico CityMexico City, Mexico
    871.9×
  100. 100GarcíaNuevo León, Mexico
    871.9×
  101. 101Hua HinPrachuap Khiri Khan, Thailand
    861.9×
  102. 101Mueang NonthaburiNonthaburi, Thailand
    861.9×
  103. 101TalaganteSantiago Metropolitan, Chile
    861.9×
  104. 104ConcónValparaiso, Chile
    861.9×
  105. 104Sai MaiBangkok, Thailand
    861.9×
  106. 106Novi PazarCentral Serbia, Serbia
    861.9×
  107. 107Santa CatarinaNuevo León, Mexico
    851.8×
  108. 108HualquiBiobio, Chile
    851.8×
  109. 109ZapopanJalisco, Mexico
    851.8×
  110. 110Saphan SungBangkok, Thailand
    851.8×
  111. 111Naucalpan de JuárezMéxico, Mexico
    841.8×
  112. 111Khan Na YaoBangkok, Thailand
    841.8×
  113. 113Nong ChokBangkok, Thailand
    841.8×
  114. 113CuernavacaMorelos, Mexico
    841.8×
  115. 115SantiagoSantiago Metropolitan, Chile
    841.8×
  116. 116Cadereyta JiménezNuevo León, Mexico
    841.8×
  117. 117SaraburiSaraburi, Thailand
    831.8×
  118. 118Khlong LuangPathum Thani, Thailand
    821.7×
  119. 118HualpénBiobio, Chile
    821.7×
  120. 120PirotCentral Serbia, Serbia
    821.7×
  121. 120YangonYangon, Myanmar
    821.7×
  122. 122SalamancaGuanajuato, Mexico
    821.7×
  123. 122Santiago de QuerétaroQuerétaro, Mexico
    821.7×
  124. 124Bueng KumBangkok, Thailand
    821.7×
  125. 125GuadalajaraJalisco, Mexico
    821.7×
  126. 126NacimientoBiobio, Chile
    811.7×
  127. 127Bang KapiBangkok, Thailand
    801.7×
  128. 128PristinaPristina, Kosovo
    801.6×
  129. 129ValdiviaLos Ríos Region, Chile
    801.6×
  130. 130Samut SakhonSamut Sakhon, Thailand
    801.6×
  131. 130ShanghaiShanghai, China
    801.6×
  132. 132San CarlosÑuble, Chile
    791.6×
  133. 132CoronelBiobio, Chile
    791.6×
  134. 134ChillánÑuble, Chile
    791.6×
  135. 134IrapuatoGuanajuato, Mexico
    791.6×
  136. 136Phra PradaengSamut Prakan, Thailand
    791.6×
  137. 136Ban Khlong PrawetBangkok, Thailand
    791.6×
  138. 138NišCentral Serbia, Serbia
    781.6×
  139. 139Surat ThaniSurat Thani, Thailand
    781.6×
  140. 140Wan ChaiWan Chai, Hong Kong
    781.6×
  141. 141Ban ChangRayong, Thailand
    781.6×
  142. 142BakuBaki, Azerbaijan
    771.6×
  143. 142Laem ChabangChon Buri, Thailand
    771.6×
  144. 144ConakryConakry, Guinea
    771.5×
  145. 144RancaguaO'Higgins Region, Chile
    771.5×
  146. 144LimaLima Province, Peru
    771.5×
  147. 147Ban Talat BuengChon Buri, Thailand
    771.5×
  148. 147Puente AltoSantiago Metropolitan, Chile
    771.5×
  149. 149Lat KrabangBangkok, Thailand
    761.5×
  150. 150ThembisaGauteng, South Africa
    761.5×
  151. 150Bang Bo DistrictSamut Prakan, Thailand
    761.5×
  152. 152KhartoumKhartoum, Sudan
    761.5×
  153. 153Addis AbabaAddis Ababa, Ethiopia
    761.5×
  154. 153ToméBiobio, Chile
    761.5×
  155. 155CuricóMaule Region, Chile
    751.5×
  156. 156ChanthaburiChanthaburi, Thailand
    751.5×
  157. 157Mong KokYau Tsim Mong District, Hong Kong
    751.5×
  158. 157LinaresMaule Region, Chile
    751.5×
  159. 159Kathmandulow-cost sensorsBagmati Province, Nepal
    741.4×
  160. 159TemucoAraucania, Chile
    741.4×
  161. 161YalaYala, Thailand
    741.4×
  162. 162CayenneGuyane, French Guiana
    741.4×
  163. 163León de los AldamaGuanajuato, Mexico
    741.4×
  164. 164Hat YaiSongkhla, Thailand
    731.4×
  165. 164CuranilahueBiobio, Chile
    731.4×
  166. 166PhuketPhuket, Thailand
    731.4×
  167. 166San Luis PotosíSan Luis Potosí, Mexico
    731.4×
  168. 166GuanajuatoGuanajuato, Mexico
    731.4×
  169. 169RayongRayong, Thailand
    731.4×
  170. 170KragujevacCentral Serbia, Serbia
    731.4×
  171. 171RengoO'Higgins Region, Chile
    731.4×
  172. 171Los ÁngelesBiobio, Chile
    731.4×
  173. 173Islamabadlow-cost sensorsIslamabad, Pakistan
    721.4×
  174. 173Pachuca de SotoHidalgo, Mexico
    721.4×
  175. 175Karachilow-cost sensorsSindh, Pakistan
    721.4×
  176. 176AricaArica y Parinacota Region, Chile
    721.4×
  177. 176Ciudad General EscobedoNuevo León, Mexico
    721.4×
  178. 178BrakpanGauteng, South Africa
    721.3×
  179. 178ChiguayanteBiobio, Chile
    721.3×
  180. 178San Luis de la PazGuanajuato, Mexico
    721.3×
  181. 181Corpus ChristiTexas, United States
    711.3×
  182. 182TalcaMaule Region, Chile
    711.3×
  183. 183La SerenaCoquimbo Region, Chile
    701.3×
  184. 184TratTrat, Thailand
    701.3×
  185. 185HoustonTexas, United States
    701.3×
  186. 186AcharnésAttica, Greece
    701.3×
  187. 186LazarevacCentral Serbia, Serbia
    701.3×
  188. 188LotaBiobio, Chile
    691.3×
  189. 189Gómez PalacioDurango, Mexico
    691.3×
  190. 190AbasoloGuanajuato, Mexico
    691.3×
  191. 191VictoriaCentral and Western, Hong Kong
    691.2×
  192. 191TocopillaAntofagasta, Chile
    691.2×
  193. 193EdinburgTexas, United States
    691.2×
  194. 194CoquimboCoquimbo Region, Chile
    681.2×
  195. 195TalcahuanoBiobio, Chile
    681.2×
  196. 196MumbaiMaharashtra, India
    681.2×
  197. 196CauquenesMaule Region, Chile
    681.2×
  198. 198AsprópyrgosAttica, Greece
    671.2×
  199. 198LaredoTexas, United States
    671.2×
  200. 200Nakhon Si ThammaratNakhon Si Thammarat, Thailand
    671.2×

Top 200 of 1,512 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, April 3, 2023, smogrank.com/history/2023-04-03 (accessed 2 Oct 2026).

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