SmogRank / History / October 31, 2023

Most polluted cities on October 31, 2023

1,846 cities ranked by their average PM2.5 over the day; the worst was Lahore, Pakistan, at 314.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during October 31, 2023. All episodes.

← Lahore 314.0 µg/m³ 300 µg/m³15 WHO 24-hour guideline
Every city ranked for October 31, 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. 1Lahorelow-cost sensorsPunjab, Pakistan
    47720.9×
  2. 2AshgabatAshgabat, Turkmenistan
    29414.6×
  3. 3DelhiDelhi, India
    26412.6×
  4. 4Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    24611.4×
  5. 5Dhakalow-cost sensorsDhaka Division, Bangladesh
    1907.4×
  6. 6BeijingBeijing, China
    1887.2×
  7. 7Karachilow-cost sensorsSindh, Pakistan
    1796.4×
  8. 8KolkataWest Bengal, India
    1786.2×
  9. 9N'DjamenaN’Djaména, Chad
    1776.2×
  10. 10Islamabadlow-cost sensorsIslamabad, Pakistan
    1756.0×
  11. 11HyderabadTelangana, India
    1695.4×
  12. 12MumbaiMaharashtra, India
    1614.7×
  13. 13Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1604.6×
  14. 14TlaquepaqueJalisco, Mexico
    1554.0×
  15. 15ZapopanJalisco, Mexico
    1543.9×
  16. 16HanoiHanoi, Vietnam
    1533.9×
  17. 17VeracruzVeracruz, Mexico
    1513.7×
  18. 18CairoCairo, Egypt
    1513.7×
  19. 19DushanbeDushanbe, Tajikistan
    1383.4×
  20. 20AntananarivoAnalamanga, Madagascar
    1293.1×
  21. 21ShenyangLiaoning, China
    1283.1×
  22. 22PristinaPristina, Kosovo
    1233.0×
  23. 23TemucoAraucania, Chile
    1172.8×
  24. 24Puerto VarasLos Lagos Region, Chile
    1142.7×
  25. 25SalorTashkent Region, Uzbekistan
    1082.6×
  26. 25Abujalow-cost sensorsFCT, Nigeria
    1082.6×
  27. 27TetovoTetovo, North Macedonia
    1072.5×
  28. 28GuadalajaraJalisco, Mexico
    992.3×
  29. 29SalemOregon, United States
    972.3×
  30. 30HualpénBiobio, Chile
    942.2×
  31. 31AlbanyOregon, United States
    912.1×
  32. 32WoodburnOregon, United States
    912.0×
  33. 33MexicaliBaja California, Mexico
    912.0×
  34. 34CranbrookBritish Columbia, Canada
    881.9×
  35. 35Kathmandulow-cost sensorsBagmati Province, Nepal
    871.9×
  36. 36ParklandWashington, United States
    871.9×
  37. 37TocopillaAntofagasta, Chile
    861.9×
  38. 38GuangzhouGuangdong, China
    851.8×
  39. 39JeddahMecca Region, Saudi Arabia
    851.8×
  40. 40Ulu BedokSingapore
    851.8×
  41. 41Ang Mo Kio New TownSingapore
    821.7×
  42. 42NacimientoBiobio, Chile
    821.7×
  43. 43DallasOregon, United States
    821.7×
  44. 44San Francisco TlalcilalcalpanMéxico, Mexico
    811.7×
  45. 45TolucaMéxico, Mexico
    811.7×
  46. 46CholulaPuebla, Mexico
    791.6×
  47. 46MoscowIdaho, United States
    791.6×
  48. 48Kampalalow-cost sensorsCentral Region, Uganda
    781.6×
  49. 49RentonWashington, United States
    781.6×
  50. 50SkopjeGrad Skopje, North Macedonia
    771.6×
  51. 50San Salvador TizatlalliMéxico, Mexico
    771.6×
  52. 52BucharestBucharest, Romania
    771.5×
  53. 52ColomboWestern Province, Sri Lanka
    771.5×
  54. 54LewistonIdaho, United States
    771.5×
  55. 55Tin Shui WaiYuen Long, Hong Kong
    761.5×
  56. 56KigaliKigali, Rwanda
    761.5×
  57. 57OurenseGalicia, Spain
    761.5×
  58. 57CoronelBiobio, Chile
    761.5×
  59. 59Samut SakhonSamut Sakhon, Thailand
    751.5×
  60. 60AthensAttica, Greece
    751.5×
  61. 60Tuen MunTuen Mun, Hong Kong
    751.5×
  62. 62Wan ChaiWan Chai, Hong Kong
    741.4×
  63. 62CentraliaWashington, United States
    741.4×
  64. 64TacomaWashington, United States
    741.4×
  65. 65Addis AbabaAddis Ababa, Ethiopia
    741.4×
  66. 66YakimaWashington, United States
    731.4×
  67. 67TalcahuanoBiobio, Chile
    731.4×
  68. 67QuinteroValparaiso, Chile
    731.4×
  69. 69ValdiviaLos Ríos Region, Chile
    731.4×
  70. 69SalamancaGuanajuato, Mexico
    731.4×
  71. 71HermistonOregon, United States
    731.4×
  72. 72CoquimboCoquimbo Region, Chile
    721.4×
  73. 72WoodlandCalifornia, United States
    721.4×
  74. 72SpokaneWashington, United States
    721.4×
  75. 72Spokane ValleyWashington, United States
    721.4×
  76. 76EugeneOregon, United States
    711.3×
  77. 77La SerenaCoquimbo Region, Chile
    711.3×
  78. 78RuseRuse, Bulgaria
    711.3×
  79. 79QuillotaValparaiso, Chile
    701.3×
  80. 80San Tung Chung HangIslands, Hong Kong
    701.3×
  81. 80SarajevoFederation of B&H, Bosnia and Herzegovina
    701.3×
  82. 82CanbyOregon, United States
    701.3×
  83. 83FanlingNorth District, Hong Kong
    691.3×
  84. 83Accralow-cost sensorsGreater Accra, Ghana
    691.3×
  85. 85NišCentral Serbia, Serbia
    691.3×
  86. 85Ulan BatorUlaanbaatar, Mongolia
    691.3×
  87. 87Coeur d'AleneIdaho, United States
    691.3×
  88. 88SunnysideWashington, United States
    691.2×
  89. 89SeattleWashington, United States
    691.2×
  90. 90IlindenIlinden, North Macedonia
    681.2×
  91. 91LangleyBritish Columbia, Canada
    681.2×
  92. 92BakersfieldCalifornia, United States
    681.2×
  93. 93RedmondOregon, United States
    681.2×
  94. 94HualquiBiobio, Chile
    681.2×
  95. 94Columbia CityWashington, United States
    681.2×
  96. 96Kwai ChungKwai Tsing District, Hong Kong
    671.2×
  97. 96MiyakonojōMiyazaki, Japan
    671.2×
  98. 96RoseburgOregon, United States
    671.2×
  99. 99Prince GeorgeBritish Columbia, Canada
    671.2×
  100. 99TerraceBritish Columbia, Canada
    671.2×
  101. 101AsprópyrgosAttica, Greece
    671.2×
  102. 102Walla WallaWashington, United States
    671.2×
  103. 103WenatcheeWashington, United States
    671.2×
  104. 103DuncanBritish Columbia, Canada
    671.2×
  105. 103KirishimaKagoshima, Japan
    671.2×
  106. 106Tai PoTai Po, Hong Kong
    661.2×
  107. 106TurlockCalifornia, United States
    661.2×
  108. 106VernonBritish Columbia, Canada
    661.2×
  109. 109San CarlosÑuble, Chile
    661.2×
  110. 109HillsboroOregon, United States
    661.2×
  111. 111HanfordCalifornia, United States
    661.1×
  112. 111ModestoCalifornia, United States
    661.1×
  113. 111Arden-ArcadeCalifornia, United States
    661.1×
  114. 114Moses LakeWashington, United States
    661.1×
  115. 115BitolaBitola, North Macedonia
    661.1×
  116. 115Queenstown Estatelow-cost sensorsSingapore
    661.1×
  117. 117BakuBaki, Azerbaijan
    661.1×
  118. 117Tsuen WanTsuen Wan, Hong Kong
    661.1×
  119. 117HelenaMontana, United States
    661.1×
  120. 117PendletonOregon, United States
    661.1×
  121. 121Mong KokYau Tsim Mong District, Hong Kong
    651.1×
  122. 121Yuba CityCalifornia, United States
    651.1×
  123. 121EllensburgWashington, United States
    651.1×
  124. 121KamloopsBritish Columbia, Canada
    651.1×
  125. 125AltamontOregon, United States
    651.1×
  126. 125PullmanWashington, United States
    651.1×
  127. 127SacramentoCalifornia, United States
    651.1×
  128. 127TigardOregon, United States
    651.1×
  129. 127LangfordBritish Columbia, Canada
    651.1×
  130. 130The DallesOregon, United States
    641.1×
  131. 131KazincbarcikaBorsod-Abaúj-Zemplén, Hungary
    641.1×
  132. 131KavadarciKavadarci, North Macedonia
    641.1×
  133. 131Viña del MarValparaiso, Chile
    641.1×
  134. 131AuburnWashington, United States
    641.1×
  135. 135CalamaAntofagasta, Chile
    641.1×
  136. 136ConcónValparaiso, Chile
    641.1×
  137. 136Grants PassOregon, United States
    641.1×
  138. 138YachiyoChiba, Japan
    641.1×
  139. 139FresnoCalifornia, United States
    631.1×
  140. 139CourtenayBritish Columbia, Canada
    631.1×
  141. 141Tepeji del Río de OcampoHidalgo, Mexico
    631.0×
  142. 142Nong KhaemBangkok, Thailand
    631.0×
  143. 142IrapuatoGuanajuato, Mexico
    631.0×
  144. 142San JoseCalifornia, United States
    631.0×
  145. 142Coos BayOregon, United States
    631.0×
  146. 146Cluj-NapocaCluj County, Romania
    631.0×
  147. 146BangkokBangkok, Thailand
    631.0×
  148. 146KagoshimaKagoshima, Japan
    631.0×
  149. 146CalgaryAlberta, Canada
    631.0×
  150. 146VancouverBritish Columbia, Canada
    631.0×
  151. 151SliemaTas-Sliema, Malta
    631.0×
  152. 151MillcreekUtah, United States
    631.0×
  153. 151LongviewWashington, United States
    631.0×
  154. 151Jardines de la SillaNuevo León, Mexico
    631.0×
  155. 155Quezon Citylow-cost sensorsNational Capital Region, Philippines
    631.0×
  156. 155KazoSaitama, Japan
    631.0×
  157. 155Jurong WestSingapore
    631.0×
  158. 155ChiguayanteBiobio, Chile
    631.0×
  159. 155VictoriaBritish Columbia, Canada
    631.0×
  160. 160BoiseIdaho, United States
    621.0×
  161. 161CorcoranCalifornia, United States
    621.0×
  162. 161Tri-CitiesWashington, United States
    621.0×
  163. 163Sham Shui PoSham Shui Po District, Hong Kong
    621.0×
  164. 163Tula de AllendeHidalgo, Mexico
    621.0×
  165. 163Granite CityIllinois, United States
    621.0×
  166. 163Missouri CityTexas, United States
    621.0×
  167. 167PiraeusAttica, Greece
    621.0×
  168. 167Sau Mau PingKwun Tong District, Hong Kong
    621.0×
  169. 167ŌmutaFukuoka, Japan
    621.0×
  170. 167ŻabbarĦaż-Żabbar, Malta
    621.0×
  171. 167RichmondBritish Columbia, Canada
    621.0×
  172. 172CosladaMadrid, Spain
    621.0×
  173. 172ChikuseiIbaraki, Japan
    621.0×
  174. 174ThessaloníkiCentral Macedonia, Greece
    611.0×
  175. 174AbbotsfordBritish Columbia, Canada
    611.0×
  176. 176HanyūSaitama, Japan
    611.0×
  177. 176TalcaMaule Region, Chile
    611.0×
  178. 176ShorelineWashington, United States
    611.0×
  179. 179UtoKumamoto, Japan
    611.0×
  180. 180KošiceKošice Region, Slovakia
    611.0×
  181. 180GyōdaSaitama, Japan
    611.0×
  182. 180CalexicoCalifornia, United States
    611.0×
  183. 183Phra PradaengSamut Prakan, Thailand
    610.9×
  184. 183KobayashiMiyazaki, Japan
    610.9×
  185. 183KiryūGunma, Japan
    610.9×
  186. 183Fort St. JohnBritish Columbia, Canada
    610.9×
  187. 187AcharnésAttica, Greece
    600.9×
  188. 187Tanushimarumachi-toyokiFukuoka, Japan
    600.9×
  189. 187ButteMontana, United States
    600.9×
  190. 190Maebaru-chūōFukuoka, Japan
    600.9×
  191. 190ChigasakiKanagawa, Japan
    600.9×
  192. 190León de los AldamaGuanajuato, Mexico
    600.9×
  193. 190DenverColorado, United States
    600.9×
  194. 190VancouverWashington, United States
    600.9×
  195. 195Samut PrakanSamut Prakan, Thailand
    600.9×
  196. 195SandachōHyōgo, Japan
    600.9×
  197. 195PueblaPuebla, Mexico
    600.9×
  198. 195Santa CatarinaNuevo León, Mexico
    600.9×
  199. 199PrešovPrešov Region, Slovakia
    600.9×
  200. 199MedfordOregon, United States
    600.9×

Top 200 of 1,846 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 31, 2023, smogrank.com/history/2023-10-31 (accessed 2 Oct 2026).

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