SmogRank / History / October 23, 2023

Most polluted cities on October 23, 2023

1,666 cities ranked by their average PM2.5 over the day; the worst was Delhi, India, at 127.0 µg/m³. Each city's own local calendar day.

← Delhi 127.0 µg/m³ 100 µg/m³15 WHO 24-hour guideline
Every city ranked for October 23, 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. 1DelhiDelhi, India
    2028.5×
  2. 2BeijingBeijing, China
    1846.8×
  3. 3N'DjamenaN’Djaména, Chad
    1796.4×
  4. 4Dhakalow-cost sensorsDhaka Division, Bangladesh
    1715.6×
  5. 5DushanbeDushanbe, Tajikistan
    1685.3×
  6. 6Lahorelow-cost sensorsPunjab, Pakistan
    1665.2×
  7. 7MumbaiMaharashtra, India
    1655.1×
  8. 8ShenyangLiaoning, China
    1614.6×
  9. 9Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1594.5×
  10. 10CosladaMadrid, Spain
    1564.2×
  11. 11CairoCairo, Egypt
    1544.0×
  12. 12HyderabadTelangana, India
    1543.9×
  13. 13HanoiHanoi, Vietnam
    1533.9×
  14. 14KolkataWest Bengal, India
    1523.8×
  15. 15Ulan BatorUlaanbaatar, Mongolia
    1283.1×
  16. 16Karachilow-cost sensorsSindh, Pakistan
    1212.9×
  17. 17AlgiersAlgiers, Algeria
    1122.7×
  18. 18PristinaPristina, Kosovo
    1082.6×
  19. 19AntananarivoAnalamanga, Madagascar
    1032.4×
  20. 20Samut SakhonSamut Sakhon, Thailand
    992.3×
  21. 21Nong KhaemBangkok, Thailand
    982.3×
  22. 22Kampalalow-cost sensorsCentral Region, Uganda
    952.2×
  23. 23HualpénBiobio, Chile
    902.0×
  24. 24JeddahMecca Region, Saudi Arabia
    892.0×
  25. 25Abujalow-cost sensorsFCT, Nigeria
    881.9×
  26. 26Tha BoNong Khai, Thailand
    871.9×
  27. 27Phra PradaengSamut Prakan, Thailand
    851.8×
  28. 27Mueang NonthaburiNonthaburi, Thailand
    851.8×
  29. 29ManamaManama, Bahrain
    851.8×
  30. 30SalorTashkent Region, Uzbekistan
    831.8×
  31. 31BangkokBangkok, Thailand
    811.7×
  32. 32GuangzhouGuangdong, China
    801.7×
  33. 33Kathmandulow-cost sensorsBagmati Province, Nepal
    801.6×
  34. 34JakartaJakarta, Indonesia
    791.6×
  35. 35Baton RougeLouisiana, United States
    761.5×
  36. 36TocopillaAntofagasta, Chile
    761.5×
  37. 37Nakhon PathomNakhon Pathom, Thailand
    751.5×
  38. 38TetovoTetovo, North Macedonia
    751.5×
  39. 39San CarlosÑuble, Chile
    751.5×
  40. 40QuinteroValparaiso, Chile
    741.4×
  41. 41NairobiNairobi County, Kenya
    741.4×
  42. 42Samut PrakanSamut Prakan, Thailand
    731.4×
  43. 42SarajevoFederation of B&H, Bosnia and Herzegovina
    731.4×
  44. 44AsprópyrgosAttica, Greece
    731.4×
  45. 45QuillotaValparaiso, Chile
    731.4×
  46. 45KennerLouisiana, United States
    731.4×
  47. 47PascagoulaMississippi, United States
    721.4×
  48. 48Bang Bo DistrictSamut Prakan, Thailand
    721.3×
  49. 49Addis AbabaAddis Ababa, Ethiopia
    711.3×
  50. 49GulfportMississippi, United States
    711.3×
  51. 51Ulu BedokSingapore
    711.3×
  52. 52Quezon Citylow-cost sensorsNational Capital Region, Philippines
    711.3×
  53. 53RuseRuse, Bulgaria
    711.3×
  54. 53KochaniKochani, North Macedonia
    711.3×
  55. 55San Pedro de la PazBiobio, Chile
    711.3×
  56. 56CoronelBiobio, Chile
    701.3×
  57. 57KavadarciKavadarci, North Macedonia
    701.3×
  58. 57BitolaBitola, North Macedonia
    701.3×
  59. 59NišCentral Serbia, Serbia
    701.3×
  60. 60NacimientoBiobio, Chile
    691.3×
  61. 60HattiesburgMississippi, United States
    691.3×
  62. 62Ang Mo Kio New TownSingapore
    681.2×
  63. 63ThessaloníkiCentral Macedonia, Greece
    681.2×
  64. 64TalcahuanoBiobio, Chile
    681.2×
  65. 65CelayaGuanajuato, Mexico
    671.2×
  66. 66YumaArizona, United States
    671.2×
  67. 67Viña del MarValparaiso, Chile
    671.2×
  68. 68UmeåVästerbotten, Sweden
    661.2×
  69. 68IlindenIlinden, North Macedonia
    661.2×
  70. 70ConcónValparaiso, Chile
    661.2×
  71. 71CalamaAntofagasta, Chile
    661.1×
  72. 72VelesVeles, North Macedonia
    661.1×
  73. 72JacksonMississippi, United States
    661.1×
  74. 74AthensAttica, Greece
    661.1×
  75. 74MiyakonojōMiyazaki, Japan
    661.1×
  76. 76West MifflinPennsylvania, United States
    661.1×
  77. 77LotaBiobio, Chile
    651.1×
  78. 78PátraWest Greece, Greece
    651.1×
  79. 78Little RockArkansas, United States
    651.1×
  80. 80SalamancaGuanajuato, Mexico
    641.1×
  81. 81McKeesportPennsylvania, United States
    641.1×
  82. 82SkopjeGrad Skopje, North Macedonia
    641.1×
  83. 82YachiyoChiba, Japan
    641.1×
  84. 84Queenstown Estatelow-cost sensorsSingapore
    631.0×
  85. 84BogotáBogota D.C., Colombia
    631.0×
  86. 86ŻabbarĦaż-Żabbar, Malta
    631.0×
  87. 87San Luis de la PazGuanajuato, Mexico
    631.0×
  88. 88BrawleyCalifornia, United States
    631.0×
  89. 89NagaiYamagata, Japan
    621.0×
  90. 90OlomoucOlomouc Region, Czechia
    621.0×
  91. 91KurashikiOkayama, Japan
    621.0×
  92. 92NichinanMiyazaki, Japan
    611.0×
  93. 92KakegawaShizuoka, Japan
    611.0×
  94. 94KazincbarcikaBorsod-Abaúj-Zemplén, Hungary
    611.0×
  95. 94São PauloSão Paulo, Brazil
    611.0×
  96. 94BirminghamAlabama, United States
    611.0×
  97. 97SliemaTas-Sliema, Malta
    611.0×
  98. 98PerpignanOccitanie, France
    610.9×
  99. 98Banja LukaSrpska, Bosnia and Herzegovina
    610.9×
  100. 100AshgabatAshgabat, Turkmenistan
    600.9×
  101. 101YawataKyoto, Japan
    600.9×
  102. 101Asunciónlow-cost sensorsAsuncion, Paraguay
    600.9×
  103. 101Ferry PassFlorida, United States
    600.9×
  104. 104Ponca CityOklahoma, United States
    600.9×
  105. 105AlessandriaPiedmont, Italy
    600.9×
  106. 106AcharnésAttica, Greece
    600.9×
  107. 107BucharestBucharest, Romania
    590.9×
  108. 107ColomboWestern Province, Sri Lanka
    590.9×
  109. 109CartagenaMurcia, Spain
    590.9×
  110. 109Český TěšínMoravian-Silesian Region, Czechia
    590.9×
  111. 109TempeArizona, United States
    590.9×
  112. 112Almatylow-cost sensorsAlmaty, Kazakhstan
    590.9×
  113. 112KogaFukuoka, Japan
    590.9×
  114. 114OkayamaOkayama, Japan
    590.9×
  115. 114KasaokaOkayama, Japan
    590.9×
  116. 114GyōdaSaitama, Japan
    590.9×
  117. 114Sainte-Geneviève-des-BoisÎle-de-France, France
    590.9×
  118. 118NaplesCampania, Italy
    590.9×
  119. 119IwadeWakayama, Japan
    580.9×
  120. 120BelgradeCentral Serbia, Serbia
    580.9×
  121. 120MartinŽilina Region, Slovakia
    580.9×
  122. 120BerounCentral Bohemia, Czechia
    580.9×
  123. 123ColumbusGeorgia, United States
    580.9×
  124. 123LewistonIdaho, United States
    580.9×
  125. 123BizenOkayama, Japan
    580.9×
  126. 126Kan’onjichōKagawa, Japan
    580.9×
  127. 126FujinomiyaShizuoka, Japan
    580.9×
  128. 128Tanushimarumachi-toyokiFukuoka, Japan
    580.8×
  129. 128TexarkanaTexas, United States
    580.8×
  130. 130NabariMie, Japan
    580.8×
  131. 131BarcelonaCatalonia, Spain
    570.8×
  132. 131PrichardAlabama, United States
    570.8×
  133. 131ShreveportLouisiana, United States
    570.8×
  134. 131YoungstownOhio, United States
    570.8×
  135. 131MidwayFlorida, United States
    570.8×
  136. 136PylaíaCentral Macedonia, Greece
    570.8×
  137. 136MurciaMurcia, Spain
    570.8×
  138. 138KošiceKošice Region, Slovakia
    570.8×
  139. 138TamanoOkayama, Japan
    570.8×
  140. 138TakanabeMiyazaki, Japan
    570.8×
  141. 138SandachōHyōgo, Japan
    570.8×
  142. 138La Línea de la ConcepciónAndalusia, Spain
    570.8×
  143. 138DěčínÚstí nad Labem Region, Czechia
    570.8×
  144. 138ArezzoTuscany, Italy
    570.8×
  145. 145KhalándrionAttica, Greece
    570.8×
  146. 145PalmaBalearic Islands, Spain
    570.8×
  147. 145TallahasseeFlorida, United States
    570.8×
  148. 145SugaiKyoto, Japan
    570.8×
  149. 149Narutochō-mitsuishiTokushima, Japan
    560.8×
  150. 150SōjaOkayama, Japan
    560.8×
  151. 150Nara-shiNara, Japan
    560.8×
  152. 150MenumaSaitama, Japan
    560.8×
  153. 150ThorntonColorado, United States
    560.8×
  154. 154Kashihara-shiNara, Japan
    560.8×
  155. 154ChalmetteLouisiana, United States
    560.8×
  156. 154New OrleansLouisiana, United States
    560.8×
  157. 154TulsaOklahoma, United States
    560.8×
  158. 158BakuBaki, Azerbaijan
    560.8×
  159. 158PrešovPrešov Region, Slovakia
    560.8×
  160. 158TsurusakiOita, Japan
    560.8×
  161. 158AmagasakiHyōgo, Japan
    560.8×
  162. 158WoodlandsSingapore
    560.8×
  163. 158FlorenceTuscany, Italy
    560.8×
  164. 158GlendaleArizona, United States
    560.8×
  165. 165CraiovaDolj, Romania
    550.8×
  166. 165KashiwaraNara, Japan
    550.8×
  167. 165TeltowBrandenburg, Germany
    550.8×
  168. 165GyálPest County, Hungary
    550.8×
  169. 165DublinOhio, United States
    550.8×
  170. 165Misato, SaitamaSaitama, Japan
    550.8×
  171. 171Romans-sur-IsèreAuvergne-Rhône-Alpes, France
    550.8×
  172. 171VigoGalicia, Spain
    550.8×
  173. 173MinatoWakayama, Japan
    550.8×
  174. 173SanoTochigi, Japan
    550.8×
  175. 173PřerovOlomouc Region, Czechia
    550.8×
  176. 173MiamiFlorida, United States
    550.8×
  177. 173ClevelandOhio, United States
    550.8×
  178. 173TatsunoHyōgo, Japan
    550.8×
  179. 179Botevgradlow-cost sensorsSofia, Bulgaria
    550.7×
  180. 179ShidoKagawa, Japan
    550.7×
  181. 179ŌmutaFukuoka, Japan
    550.7×
  182. 179KumagayaSaitama, Japan
    550.7×
  183. 179DetroitMichigan, United States
    550.7×
  184. 184SuzukaMie, Japan
    550.7×
  185. 184LitvínovÚstí nad Labem Region, Czechia
    550.7×
  186. 184TurinPiedmont, Italy
    550.7×
  187. 184KirishimaKagoshima, Japan
    550.7×
  188. 188TsuyamaOkayama, Japan
    550.7×
  189. 188OnoHyōgo, Japan
    550.7×
  190. 188MarugameKagawa, Japan
    550.7×
  191. 188KazoSaitama, Japan
    550.7×
  192. 188YachimataChiba, Japan
    550.7×
  193. 188OldenburgLower Saxony, Germany
    550.7×
  194. 188MontpellierOccitanie, France
    550.7×
  195. 188ChikuseiIbaraki, Japan
    550.7×
  196. 188YatomiAichi, Japan
    550.7×
  197. 197Haskovolow-cost sensorsHaskovo, Bulgaria
    540.7×
  198. 197MiyazakiMiyazaki, Japan
    540.7×
  199. 197KameyamaMie, Japan
    540.7×
  200. 197ValenceAuvergne-Rhône-Alpes, France
    540.7×

Top 200 of 1,666 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 23, 2023, smogrank.com/history/2023-10-23 (accessed 2 Oct 2026).

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