SmogRank / History / October 1, 2023

Most polluted cities on October 1, 2023

1,650 cities ranked by their average PM2.5 over the day; the worst was Karachi, Pakistan, at 85.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during October 1, 2023. All episodes.

← Karachi 85.0 µg/m³ 80 µg/m³15 WHO 24-hour guideline
Every city ranked for October 1, 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. 1Karachilow-cost sensorsSindh, Pakistan
    1725.7×
  2. 2JakartaJakarta, Indonesia
    1614.7×
  3. 3Lahorelow-cost sensorsPunjab, Pakistan
    1564.2×
  4. 4Kampalalow-cost sensorsCentral Region, Uganda
    1564.2×
  5. 5DelhiDelhi, India
    1523.8×
  6. 6HanoiHanoi, Vietnam
    1212.9×
  7. 7TlaquepaqueJalisco, Mexico
    1202.9×
  8. 8Islamabadlow-cost sensorsIslamabad, Pakistan
    1172.8×
  9. 9Kuala LumpurKuala Lumpur, Malaysia
    1122.7×
  10. 9WorcesterMassachusetts, United States
    1122.7×
  11. 11New LondonConnecticut, United States
    1112.6×
  12. 12NacimientoBiobio, Chile
    1032.4×
  13. 13PortlandMaine, United States
    1022.4×
  14. 14ManamaManama, Bahrain
    1012.4×
  15. 15HaverhillMassachusetts, United States
    1012.4×
  16. 16Fall RiverMassachusetts, United States
    1002.4×
  17. 17Ang Mo Kio New TownSingapore
    992.3×
  18. 18CairoCairo, Egypt
    982.3×
  19. 19Lexingtonlow-cost sensorsMassachusetts, United States
    982.3×
  20. 20BrocktonMassachusetts, United States
    962.2×
  21. 21Puerto VarasLos Lagos Region, Chile
    962.2×
  22. 22GuangzhouGuangdong, China
    962.2×
  23. 22SarajevoFederation of B&H, Bosnia and Herzegovina
    962.2×
  24. 24Santa Anita - Los FicusLima region, Peru
    952.2×
  25. 25PristinaPristina, Kosovo
    952.2×
  26. 26Dhakalow-cost sensorsDhaka Division, Bangladesh
    942.2×
  27. 26DushanbeDushanbe, Tajikistan
    942.2×
  28. 28BostonMassachusetts, United States
    932.1×
  29. 29QuincyMassachusetts, United States
    932.1×
  30. 30ProvidenceRhode Island, United States
    932.1×
  31. 31LowellMassachusetts, United States
    922.1×
  32. 32Şabāḩ as SālimMubārak al Kabīr, Kuwait
    912.1×
  33. 32PortsmouthNew Hampshire, United States
    912.1×
  34. 34MumbaiMaharashtra, India
    912.0×
  35. 35XonacatlánMéxico, Mexico
    902.0×
  36. 35CoventryRhode Island, United States
    902.0×
  37. 37AstanaAstana, Kazakhstan
    892.0×
  38. 38San Salvador TizatlalliMéxico, Mexico
    881.9×
  39. 39LimaLima Province, Peru
    881.9×
  40. 40TolucaMéxico, Mexico
    881.9×
  41. 40LynnMassachusetts, United States
    881.9×
  42. 42San Francisco TlalcilalcalpanMéxico, Mexico
    881.9×
  43. 43AntananarivoAnalamanga, Madagascar
    871.9×
  44. 43SantiagoSantiago Metropolitan, Chile
    871.9×
  45. 43Puente AltoSantiago Metropolitan, Chile
    871.9×
  46. 46BamakoBamako, Mali
    871.9×
  47. 47RuseRuse, Bulgaria
    861.9×
  48. 48CuernavacaMorelos, Mexico
    861.9×
  49. 49Ulu BedokSingapore
    851.8×
  50. 50AlessandriaPiedmont, Italy
    851.8×
  51. 51Addis AbabaAddis Ababa, Ethiopia
    841.8×
  52. 52JeddahMecca Region, Saudi Arabia
    841.8×
  53. 53EdmundstonNew Brunswick, Canada
    831.8×
  54. 54RancaguaO'Higgins Region, Chile
    831.7×
  55. 55N'DjamenaN’Djaména, Chad
    821.7×
  56. 56Kathmandulow-cost sensorsBagmati Province, Nepal
    821.7×
  57. 57Queenstown Estatelow-cost sensorsSingapore
    821.7×
  58. 58Falconara MarittimaThe Marches, Italy
    821.7×
  59. 58CoyhaiqueAysén, Chile
    821.7×
  60. 60Puerto MonttLos Lagos Region, Chile
    821.7×
  61. 61QuillotaValparaiso, Chile
    801.6×
  62. 62OsornoLos Lagos Region, Chile
    801.6×
  63. 63HartfordConnecticut, United States
    791.6×
  64. 64San Martin Texmelucan de LabastidaPuebla, Mexico
    791.6×
  65. 64AntofagastaAntofagasta, Chile
    791.6×
  66. 66MexicaliBaja California, Mexico
    791.6×
  67. 67Los ÁngelesBiobio, Chile
    781.6×
  68. 68NišCentral Serbia, Serbia
    781.6×
  69. 69La UniónLos Ríos Region, Chile
    771.5×
  70. 70BitolaBitola, North Macedonia
    761.5×
  71. 71San CarlosÑuble, Chile
    761.5×
  72. 72GranbyQuebec, Canada
    751.5×
  73. 73AugustaMaine, United States
    751.5×
  74. 73LewistonMaine, United States
    751.5×
  75. 75NaplesCampania, Italy
    751.5×
  76. 76ConcónValparaiso, Chile
    751.5×
  77. 76Little RockArkansas, United States
    751.5×
  78. 78CholulaPuebla, Mexico
    741.4×
  79. 79TemucoAraucania, Chile
    741.4×
  80. 79Villa Poeta José Gálvez BarrenecheaLima region, Peru
    741.4×
  81. 81TocopillaAntofagasta, Chile
    741.4×
  82. 82HualquiBiobio, Chile
    741.4×
  83. 82BurlingtonVermont, United States
    741.4×
  84. 84Tepeji del Río de OcampoHidalgo, Mexico
    731.4×
  85. 85CauquenesMaule Region, Chile
    731.4×
  86. 86ValdiviaLos Ríos Region, Chile
    731.4×
  87. 87CoronelBiobio, Chile
    731.4×
  88. 88SherbrookeQuebec, Canada
    731.4×
  89. 89CuranilahueBiobio, Chile
    721.4×
  90. 89Saint JohnNew Brunswick, Canada
    721.4×
  91. 91TalaganteSantiago Metropolitan, Chile
    721.4×
  92. 92CuricóMaule Region, Chile
    721.4×
  93. 92DerryNew Hampshire, United States
    721.4×
  94. 94Viña del MarValparaiso, Chile
    721.4×
  95. 94QuinteroValparaiso, Chile
    721.4×
  96. 94BirminghamAlabama, United States
    721.4×
  97. 97AnconaThe Marches, Italy
    711.3×
  98. 98DearbornMichigan, United States
    711.3×
  99. 99BrossardQuebec, Canada
    711.3×
  100. 100CopiapóAtacama, Chile
    711.3×
  101. 101WoodlandsSingapore
    701.3×
  102. 101CapannoriTuscany, Italy
    701.3×
  103. 101QuilpuéValparaiso, Chile
    701.3×
  104. 101MonctonNew Brunswick, Canada
    701.3×
  105. 105CoquimboCoquimbo Region, Chile
    701.3×
  106. 105ChillánÑuble, Chile
    701.3×
  107. 107RengoO'Higgins Region, Chile
    701.3×
  108. 108L'Ancienne-LoretteQuebec, Canada
    691.3×
  109. 109SalorTashkent Region, Uzbekistan
    691.3×
  110. 109SpringfieldMassachusetts, United States
    691.3×
  111. 109QuébecQuebec, Canada
    691.3×
  112. 112Samut SakhonSamut Sakhon, Thailand
    691.3×
  113. 112PueblaPuebla, Mexico
    691.3×
  114. 114TalcaMaule Region, Chile
    691.2×
  115. 114TaylorMichigan, United States
    691.2×
  116. 116SarniaOntario, Canada
    691.2×
  117. 117CallaoCallao, Peru
    681.2×
  118. 118Puerto AysénAysén, Chile
    681.2×
  119. 118Alto HospicioTarapacá, Chile
    681.2×
  120. 118DetroitMichigan, United States
    681.2×
  121. 121Rivière-des-Prairies–Pointe-aux-TremblesQuebec, Canada
    681.2×
  122. 122Civitanova MarcheThe Marches, Italy
    681.2×
  123. 122LondonOntario, Canada
    681.2×
  124. 124TlaxcalaTlaxcala, Mexico
    671.2×
  125. 124Saint-Jean-sur-RichelieuQuebec, Canada
    671.2×
  126. 126Nong KhaemBangkok, Thailand
    671.2×
  127. 126PisaTuscany, Italy
    671.2×
  128. 126TalcahuanoBiobio, Chile
    671.2×
  129. 129LotaBiobio, Chile
    671.2×
  130. 129Casa GrandeArizona, United States
    671.2×
  131. 129DrummondvilleQuebec, Canada
    671.2×
  132. 129WindsorOntario, Canada
    671.2×
  133. 133Lincoln ParkMichigan, United States
    671.2×
  134. 133RedfordMichigan, United States
    671.2×
  135. 135IndianapolisIndiana, United States
    661.2×
  136. 135Port HuronMichigan, United States
    661.2×
  137. 137ThionvilleGrand Est, France
    661.2×
  138. 138Sainte-Geneviève-des-BoisÎle-de-France, France
    661.1×
  139. 138La SpeziaLiguria, Italy
    661.1×
  140. 140IyoEhime, Japan
    661.1×
  141. 140CalamaAntofagasta, Chile
    661.1×
  142. 140San Pedro de la PazBiobio, Chile
    661.1×
  143. 140San Francisco De BorjaLima region, Peru
    661.1×
  144. 144BelgradeCentral Serbia, Serbia
    661.1×
  145. 145SalamancaGuanajuato, Mexico
    661.1×
  146. 146WaterburyConnecticut, United States
    651.1×
  147. 147NairobiNairobi County, Kenya
    651.1×
  148. 147Klagenfurt am WörtherseeCarinthia, Austria
    651.1×
  149. 147Banja LukaSrpska, Bosnia and Herzegovina
    651.1×
  150. 147La SerenaCoquimbo Region, Chile
    651.1×
  151. 151TamanaKumamoto, Japan
    651.1×
  152. 151LivornoTuscany, Italy
    651.1×
  153. 151MontréalQuebec, Canada
    651.1×
  154. 154SkopjeGrad Skopje, North Macedonia
    651.1×
  155. 154Saint-ÉtienneAuvergne-Rhône-Alpes, France
    651.1×
  156. 156AsprópyrgosAttica, Greece
    641.1×
  157. 156North ChicopeeMassachusetts, United States
    641.1×
  158. 156KeeneNew Hampshire, United States
    641.1×
  159. 156BridgeportConnecticut, United States
    641.1×
  160. 160Tula de AllendeHidalgo, Mexico
    641.1×
  161. 160BangorMaine, United States
    641.1×
  162. 162Jurong WestSingapore
    641.1×
  163. 162DěčínÚstí nad Labem Region, Czechia
    641.1×
  164. 162Atlantic CityNew Jersey, United States
    641.1×
  165. 165ConcepciónBiobio, Chile
    641.1×
  166. 165RichmondCalifornia, United States
    641.1×
  167. 167ToméBiobio, Chile
    631.1×
  168. 167HernandoMississippi, United States
    631.1×
  169. 169HyderabadTelangana, India
    631.0×
  170. 170VelesVeles, North Macedonia
    631.0×
  171. 170LaconiaNew Hampshire, United States
    631.0×
  172. 170GlendaleArizona, United States
    631.0×
  173. 173AkiKochi, Japan
    631.0×
  174. 173SaguenayQuebec, Canada
    631.0×
  175. 173MimaTokushima, Japan
    631.0×
  176. 176ThessaloníkiCentral Macedonia, Greece
    631.0×
  177. 176MinamataKumamoto, Japan
    631.0×
  178. 176Hondomachi-hondoKumamoto, Japan
    631.0×
  179. 176NagaiYamagata, Japan
    631.0×
  180. 176SalernoCampania, Italy
    631.0×
  181. 176TempeArizona, United States
    631.0×
  182. 182UtoKumamoto, Japan
    631.0×
  183. 182TakanabeMiyazaki, Japan
    631.0×
  184. 184Apache JunctionArizona, United States
    621.0×
  185. 184CornwallOntario, Canada
    621.0×
  186. 186KochiKochi, Japan
    621.0×
  187. 186PleasantvilleNew Jersey, United States
    621.0×
  188. 188KavadarciKavadarci, North Macedonia
    621.0×
  189. 188Bang Bo DistrictSamut Prakan, Thailand
    621.0×
  190. 188DanburyConnecticut, United States
    621.0×
  191. 188MesaArizona, United States
    621.0×
  192. 188EdmontonAlberta, Canada
    621.0×
  193. 188HyūgaMiyazaki, Japan
    621.0×
  194. 194JenksOklahoma, United States
    621.0×
  195. 195ColomboWestern Province, Sri Lanka
    621.0×
  196. 195TsurusakiOita, Japan
    621.0×
  197. 195GrazStyria, Austria
    621.0×
  198. 198BangkokBangkok, Thailand
    611.0×
  199. 198ChiguayanteBiobio, Chile
    611.0×
  200. 200ŌtsukiYamanashi, Japan
    611.0×

Top 200 of 1,650 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, October 1, 2023, smogrank.com/history/2023-10-01 (accessed 2 Oct 2026).

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