SmogRank / History / October 20, 2023

Most polluted cities on October 20, 2023

1,742 cities ranked by their average PM2.5 over the day; the worst was Lahore, Pakistan, at 149.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during October 20, 2023. All episodes.

← Lahore 149.0 µg/m³ 100 µg/m³15 WHO 24-hour guideline
Every city ranked for October 20, 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
    2249.9×
  2. 2N'DjamenaN’Djaména, Chad
    2088.9×
  3. 3DelhiDelhi, India
    1786.3×
  4. 4Dhakalow-cost sensorsDhaka Division, Bangladesh
    1644.9×
  5. 5Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1604.6×
  6. 5HyderabadTelangana, India
    1604.6×
  7. 7MumbaiMaharashtra, India
    1584.3×
  8. 8KolkataWest Bengal, India
    1523.8×
  9. 9CairoCairo, Egypt
    1473.6×
  10. 10Samut SakhonSamut Sakhon, Thailand
    1413.4×
  11. 11Nong KhaemBangkok, Thailand
    1303.1×
  12. 12ManamaManama, Bahrain
    1283.1×
  13. 13SalorTashkent Region, Uzbekistan
    1273.1×
  14. 14Islamabadlow-cost sensorsIslamabad, Pakistan
    1263.0×
  15. 15Hradec KrálovéHradec Králové Region, Czechia
    1243.0×
  16. 16Tha BoNong Khai, Thailand
    1233.0×
  17. 17Phra PradaengSamut Prakan, Thailand
    1152.8×
  18. 18BangkokBangkok, Thailand
    1122.7×
  19. 19Ulan BatorUlaanbaatar, Mongolia
    1092.6×
  20. 20Samut PrakanSamut Prakan, Thailand
    1072.5×
  21. 20Mueang NonthaburiNonthaburi, Thailand
    1072.5×
  22. 22OpavaMoravian-Silesian Region, Czechia
    1032.4×
  23. 23AstanaAstana, Kazakhstan
    1022.4×
  24. 24Almatylow-cost sensorsAlmaty, Kazakhstan
    1012.4×
  25. 25HanoiHanoi, Vietnam
    1002.4×
  26. 26DěčínÚstí nad Labem Region, Czechia
    1002.3×
  27. 27OstravaMoravian-Silesian Region, Czechia
    982.3×
  28. 28Bang Bo DistrictSamut Prakan, Thailand
    962.2×
  29. 29TetovoTetovo, North Macedonia
    942.2×
  30. 29Karachilow-cost sensorsSindh, Pakistan
    942.2×
  31. 31HualpénBiobio, Chile
    942.1×
  32. 32TepliceÚstí nad Labem Region, Czechia
    942.1×
  33. 33BerounCentral Bohemia, Czechia
    932.1×
  34. 34Khlong LuangPathum Thani, Thailand
    932.1×
  35. 35KadaňÚstí nad Labem Region, Czechia
    932.1×
  36. 36AntananarivoAnalamanga, Madagascar
    922.1×
  37. 37PristinaPristina, Kosovo
    912.0×
  38. 38MostÚstí nad Labem Region, Czechia
    912.0×
  39. 39DushanbeDushanbe, Tajikistan
    902.0×
  40. 39Ústí nad LabemÚstí nad Labem Region, Czechia
    902.0×
  41. 39Mladá BoleslavCentral Bohemia, Czechia
    902.0×
  42. 42Quezon Citylow-cost sensorsNational Capital Region, Philippines
    902.0×
  43. 43TurlockCalifornia, United States
    892.0×
  44. 44CuricóMaule Region, Chile
    892.0×
  45. 45OlomoucOlomouc Region, Czechia
    881.9×
  46. 46SantiagoSantiago Metropolitan, Chile
    881.9×
  47. 47Puente AltoSantiago Metropolitan, Chile
    861.9×
  48. 48TijuanaBaja California, Mexico
    851.8×
  49. 49Nakhon PathomNakhon Pathom, Thailand
    851.8×
  50. 49PraguePrague, Czechia
    851.8×
  51. 51ModestoCalifornia, United States
    851.8×
  52. 52HanfordCalifornia, United States
    851.8×
  53. 53CoquimboCoquimbo Region, Chile
    831.7×
  54. 54SarajevoFederation of B&H, Bosnia and Herzegovina
    821.7×
  55. 54QuillotaValparaiso, Chile
    821.7×
  56. 56Cluj-NapocaCluj County, Romania
    821.7×
  57. 56SalernoCampania, Italy
    821.7×
  58. 56TalcaMaule Region, Chile
    821.7×
  59. 59KazincbarcikaBorsod-Abaúj-Zemplén, Hungary
    811.7×
  60. 60San CarlosÑuble, Chile
    811.7×
  61. 61Addis AbabaAddis Ababa, Ethiopia
    811.7×
  62. 61TalaganteSantiago Metropolitan, Chile
    811.7×
  63. 63České BudějoviceSouth Bohemian Region, Czechia
    811.7×
  64. 63RancaguaO'Higgins Region, Chile
    811.7×
  65. 65ŻabbarĦaż-Żabbar, Malta
    811.7×
  66. 66QuilpuéValparaiso, Chile
    801.7×
  67. 67BohumínMoravian-Silesian Region, Czechia
    801.6×
  68. 67Puerto VarasLos Lagos Region, Chile
    801.6×
  69. 69FresnoCalifornia, United States
    801.6×
  70. 70BurghausenBavaria, Germany
    791.6×
  71. 71Abujalow-cost sensorsFCT, Nigeria
    791.6×
  72. 72SliemaTas-Sliema, Malta
    791.6×
  73. 73AricaArica y Parinacota Region, Chile
    781.6×
  74. 74ToméBiobio, Chile
    781.6×
  75. 74QuinteroValparaiso, Chile
    781.6×
  76. 74ChillánÑuble, Chile
    781.6×
  77. 77Kathmandulow-cost sensorsBagmati Province, Nepal
    781.6×
  78. 77HavířovMoravian-Silesian Region, Czechia
    781.6×
  79. 79GuangzhouGuangdong, China
    781.6×
  80. 79CoronelBiobio, Chile
    781.6×
  81. 81PardubicePardubice Region, Czechia
    771.5×
  82. 81LiberecLiberec Region, Czechia
    771.5×
  83. 83CauquenesMaule Region, Chile
    771.5×
  84. 84ZnojmoSouth Moravian, Czechia
    771.5×
  85. 84Civitanova MarcheThe Marches, Italy
    771.5×
  86. 86NacimientoBiobio, Chile
    771.5×
  87. 86AntofagastaAntofagasta, Chile
    771.5×
  88. 88MaderaCalifornia, United States
    761.5×
  89. 89Frýdek-MístekMoravian-Silesian Region, Czechia
    761.5×
  90. 90NaplesCampania, Italy
    761.5×
  91. 90Viña del MarValparaiso, Chile
    761.5×
  92. 90HualquiBiobio, Chile
    761.5×
  93. 93PassauBavaria, Germany
    761.5×
  94. 93CopiapóAtacama, Chile
    761.5×
  95. 95ŽideniceSouth Moravian, Czechia
    761.5×
  96. 96KladnoCentral Bohemia, Czechia
    751.5×
  97. 97KošiceKošice Region, Slovakia
    751.5×
  98. 97WelsUpper Austria, Austria
    751.5×
  99. 99NogalesSonora, Mexico
    741.4×
  100. 100SalamancaGuanajuato, Mexico
    741.4×
  101. 100ClovisCalifornia, United States
    741.4×
  102. 102RuseRuse, Bulgaria
    741.4×
  103. 103AnsfeldenUpper Austria, Austria
    741.4×
  104. 103CoyhaiqueAysén, Chile
    741.4×
  105. 103MercedCalifornia, United States
    741.4×
  106. 106Sankt PöltenLower Austria, Austria
    731.4×
  107. 107El PasoTexas, United States
    731.4×
  108. 108TraunUpper Austria, Austria
    731.4×
  109. 109JakartaJakarta, Indonesia
    721.4×
  110. 109BeneventoCampania, Italy
    721.4×
  111. 109Los ÁngelesBiobio, Chile
    721.4×
  112. 112Český TěšínMoravian-Silesian Region, Czechia
    721.4×
  113. 112ConcepciónBiobio, Chile
    721.4×
  114. 114GyōdaSaitama, Japan
    721.4×
  115. 114TalcahuanoBiobio, Chile
    721.4×
  116. 116KlosterneuburgLower Austria, Austria
    721.3×
  117. 116LitvínovÚstí nad Labem Region, Czechia
    721.3×
  118. 118PilsenPlzeň Region, Czechia
    711.3×
  119. 118BakersfieldCalifornia, United States
    711.3×
  120. 120Kampalalow-cost sensorsCentral Region, Uganda
    711.3×
  121. 120PrešovPrešov Region, Slovakia
    711.3×
  122. 120MarktredwitzBavaria, Germany
    711.3×
  123. 123AnconaThe Marches, Italy
    711.3×
  124. 123ConcónValparaiso, Chile
    711.3×
  125. 123CorcoranCalifornia, United States
    711.3×
  126. 123BizenOkayama, Japan
    711.3×
  127. 127ColomboWestern Province, Sri Lanka
    711.3×
  128. 127LinzUpper Austria, Austria
    711.3×
  129. 127LotaBiobio, Chile
    711.3×
  130. 127EugeneOregon, United States
    711.3×
  131. 131La SerenaCoquimbo Region, Chile
    701.3×
  132. 131Yuba CityCalifornia, United States
    701.3×
  133. 131YatomiAichi, Japan
    701.3×
  134. 134BogotáBogota D.C., Colombia
    701.3×
  135. 135BucharestBucharest, Romania
    691.3×
  136. 135TsuyamaOkayama, Japan
    691.3×
  137. 135MorohongōSaitama, Japan
    691.3×
  138. 135San Pedro de la PazBiobio, Chile
    691.3×
  139. 135ChikuseiIbaraki, Japan
    691.3×
  140. 140Ang Mo Kio New TownSingapore
    691.3×
  141. 140BrnoSouth Moravian, Czechia
    691.3×
  142. 140RengoO'Higgins Region, Chile
    691.3×
  143. 143VisaliaCalifornia, United States
    691.2×
  144. 144PerchtoldsdorfLower Austria, Austria
    691.2×
  145. 144ValdiviaLos Ríos Region, Chile
    691.2×
  146. 146TatebayashiGunma, Japan
    691.2×
  147. 146TrnavaTrnava Region, Slovakia
    691.2×
  148. 146OsornoLos Lagos Region, Chile
    691.2×
  149. 149SkopjeGrad Skopje, North Macedonia
    681.2×
  150. 149WeimarThuringia, Germany
    681.2×
  151. 149Falconara MarittimaThe Marches, Italy
    681.2×
  152. 149Ciudad JuárezChihuahua, Mexico
    681.2×
  153. 153AmstettenLower Austria, Austria
    681.2×
  154. 153KelheimBavaria, Germany
    681.2×
  155. 155SanoTochigi, Japan
    681.2×
  156. 155TocopillaAntofagasta, Chile
    681.2×
  157. 155Chula VistaCalifornia, United States
    681.2×
  158. 158AnaheimCalifornia, United States
    681.2×
  159. 159Nara-shiNara, Japan
    681.2×
  160. 159AmagasakiHyōgo, Japan
    681.2×
  161. 159CuranilahueBiobio, Chile
    681.2×
  162. 159RedmondOregon, United States
    681.2×
  163. 163KazoSaitama, Japan
    671.2×
  164. 163ViennaVienna, Austria
    671.2×
  165. 163SokolovCarlsbad Region, Czechia
    671.2×
  166. 163GlendaleArizona, United States
    671.2×
  167. 167KurashikiOkayama, Japan
    671.2×
  168. 167AltenburgThuringia, Germany
    671.2×
  169. 167Sunland ParkNew Mexico, United States
    671.2×
  170. 170Spišská Nová VesKošice Region, Slovakia
    671.2×
  171. 170Alto HospicioTarapacá, Chile
    671.2×
  172. 172Banja LukaSrpska, Bosnia and Herzegovina
    671.2×
  173. 172CalamaAntofagasta, Chile
    671.2×
  174. 172MantecaCalifornia, United States
    671.2×
  175. 172JōsōIbaraki, Japan
    671.2×
  176. 176AsprópyrgosAttica, Greece
    671.2×
  177. 176SninaPrešov Region, Slovakia
    671.2×
  178. 176JenaThuringia, Germany
    671.2×
  179. 176HernandoMississippi, United States
    671.2×
  180. 176Port ArthurTexas, United States
    671.2×
  181. 181Higashi-MatsuyamaSaitama, Japan
    661.2×
  182. 182Ulu BedokSingapore
    661.2×
  183. 183SōjaOkayama, Japan
    661.1×
  184. 183OkayamaOkayama, Japan
    661.1×
  185. 183GyálPest County, Hungary
    661.1×
  186. 183JesiThe Marches, Italy
    661.1×
  187. 183BartlettTennessee, United States
    661.1×
  188. 188MostaIl-Mosta, Malta
    661.1×
  189. 188SaalfeldThuringia, Germany
    661.1×
  190. 188ZvolenBanská Bystrica Region, Slovakia
    661.1×
  191. 191KaminokawaTochigi, Japan
    661.1×
  192. 192MenumaSaitama, Japan
    661.1×
  193. 192NakaIbaraki, Japan
    661.1×
  194. 194NagaiYamagata, Japan
    651.1×
  195. 194SalzburgSalzburg, Austria
    651.1×
  196. 194MartinŽilina Region, Slovakia
    651.1×
  197. 194HyūgaMiyazaki, Japan
    651.1×
  198. 198Schwandorf in BayernBavaria, Germany
    651.1×
  199. 198PřerovOlomouc Region, Czechia
    651.1×
  200. 200KiryūGunma, Japan
    651.1×

Top 200 of 1,742 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 20, 2023, smogrank.com/history/2023-10-20 (accessed 2 Oct 2026).

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