SmogRank / History / October 17, 2023

Most polluted cities on October 17, 2023

1,724 cities ranked by their average PM2.5 over the day; the worst was Kolkata, India, at 117.0 µg/m³. Each city's own local calendar day.

← Kolkata 117.0 µg/m³ 100 µg/m³15 WHO 24-hour guideline
Every city ranked for October 17, 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. 1KolkataWest Bengal, India
    1947.8×
  2. 2Dhakalow-cost sensorsDhaka Division, Bangladesh
    1856.9×
  3. 3SalorTashkent Region, Uzbekistan
    1634.9×
  4. 4MumbaiMaharashtra, India
    1624.7×
  5. 5HanoiHanoi, Vietnam
    1604.5×
  6. 6HyderabadTelangana, India
    1554.1×
  7. 7ManamaManama, Bahrain
    1544.0×
  8. 8KōkaShiga, Japan
    1533.9×
  9. 9JakartaJakarta, Indonesia
    1523.8×
  10. 10CairoCairo, Egypt
    1363.3×
  11. 11N'DjamenaN’Djaména, Chad
    1202.9×
  12. 12DushanbeDushanbe, Tajikistan
    1152.8×
  13. 13DelhiDelhi, India
    1102.6×
  14. 14BeijingBeijing, China
    1062.5×
  15. 14Banja LukaSrpska, Bosnia and Herzegovina
    1062.5×
  16. 16HualpénBiobio, Chile
    1032.4×
  17. 17Nong KhaemBangkok, Thailand
    1032.4×
  18. 18PristinaPristina, Kosovo
    1022.4×
  19. 19GuangzhouGuangdong, China
    992.3×
  20. 20Asunciónlow-cost sensorsAsuncion, Paraguay
    992.3×
  21. 21AntananarivoAnalamanga, Madagascar
    972.2×
  22. 22SarajevoFederation of B&H, Bosnia and Herzegovina
    962.2×
  23. 23Mueang NonthaburiNonthaburi, Thailand
    942.2×
  24. 24Phra PradaengSamut Prakan, Thailand
    942.1×
  25. 25BangkokBangkok, Thailand
    922.1×
  26. 26Tha BoNong Khai, Thailand
    912.0×
  27. 27Khlong LuangPathum Thani, Thailand
    892.0×
  28. 28NišCentral Serbia, Serbia
    881.9×
  29. 29Puerto VarasLos Lagos Region, Chile
    871.9×
  30. 30Bang Bo DistrictSamut Prakan, Thailand
    871.9×
  31. 31ShenyangLiaoning, China
    861.9×
  32. 32SkopjeGrad Skopje, North Macedonia
    851.8×
  33. 32Kuala LumpurKuala Lumpur, Malaysia
    851.8×
  34. 34IlindenIlinden, North Macedonia
    851.8×
  35. 35Samut PrakanSamut Prakan, Thailand
    841.8×
  36. 36Karachilow-cost sensorsSindh, Pakistan
    831.8×
  37. 37Lahorelow-cost sensorsPunjab, Pakistan
    831.8×
  38. 38BelgradeCentral Serbia, Serbia
    831.7×
  39. 39Nakhon PathomNakhon Pathom, Thailand
    821.7×
  40. 40VelesVeles, North Macedonia
    821.7×
  41. 41Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    811.7×
  42. 42AntofagastaAntofagasta, Chile
    801.7×
  43. 43Addis AbabaAddis Ababa, Ethiopia
    801.6×
  44. 44CoronelBiobio, Chile
    801.6×
  45. 45AlgiersAlgiers, Algeria
    801.6×
  46. 46Kathmandulow-cost sensorsBagmati Province, Nepal
    791.6×
  47. 47TetovoTetovo, North Macedonia
    791.6×
  48. 47NacimientoBiobio, Chile
    791.6×
  49. 49Abujalow-cost sensorsFCT, Nigeria
    791.6×
  50. 50Ulu BedokSingapore
    781.6×
  51. 51QuillotaValparaiso, Chile
    781.6×
  52. 52SantiagoSantiago Metropolitan, Chile
    781.6×
  53. 52San CarlosÑuble, Chile
    781.6×
  54. 54AricaArica y Parinacota Region, Chile
    771.5×
  55. 55CoquimboCoquimbo Region, Chile
    771.5×
  56. 56Ang Mo Kio New TownSingapore
    771.5×
  57. 57TijuanaBaja California, Mexico
    761.5×
  58. 58TalaganteSantiago Metropolitan, Chile
    761.5×
  59. 58CoyhaiqueAysén, Chile
    761.5×
  60. 60JacksonMississippi, United States
    751.5×
  61. 61Almatylow-cost sensorsAlmaty, Kazakhstan
    751.5×
  62. 61QuinteroValparaiso, Chile
    751.5×
  63. 63ToméBiobio, Chile
    751.5×
  64. 64Puente AltoSantiago Metropolitan, Chile
    741.4×
  65. 65Los ÁngelesBiobio, Chile
    741.4×
  66. 66HualquiBiobio, Chile
    731.4×
  67. 67TalcahuanoBiobio, Chile
    731.4×
  68. 68TemucoAraucania, Chile
    721.4×
  69. 69Şabāḩ as SālimMubārak al Kabīr, Kuwait
    721.4×
  70. 69FukuchiyamaKyoto, Japan
    721.4×
  71. 69La SerenaCoquimbo Region, Chile
    721.4×
  72. 72CopiapóAtacama, Chile
    721.4×
  73. 72ChiguayanteBiobio, Chile
    721.4×
  74. 74Inglewoodlow-cost sensorsCalifornia, United States
    711.3×
  75. 75Alto HospicioTarapacá, Chile
    711.3×
  76. 76Hawthornelow-cost sensorsCalifornia, United States
    711.3×
  77. 77ConcepciónBiobio, Chile
    701.3×
  78. 78MurciaMurcia, Spain
    701.3×
  79. 78CuricóMaule Region, Chile
    701.3×
  80. 78SalamancaGuanajuato, Mexico
    701.3×
  81. 78San Pedro de la PazBiobio, Chile
    701.3×
  82. 82CuranilahueBiobio, Chile
    701.3×
  83. 83TocopillaAntofagasta, Chile
    701.3×
  84. 84RancaguaO'Higgins Region, Chile
    691.3×
  85. 84ConcónValparaiso, Chile
    691.3×
  86. 84Los AngelesCalifornia, United States
    691.3×
  87. 87San RoqueAndalusia, Spain
    691.3×
  88. 88ValdiviaLos Ríos Region, Chile
    691.3×
  89. 89La Línea de la ConcepciónAndalusia, Spain
    691.2×
  90. 89OsornoLos Lagos Region, Chile
    691.2×
  91. 89LotaBiobio, Chile
    691.2×
  92. 89Jurupa ValleyCalifornia, United States
    691.2×
  93. 93ComptonCalifornia, United States
    681.2×
  94. 94Tanushimarumachi-toyokiFukuoka, Japan
    681.2×
  95. 94Viña del MarValparaiso, Chile
    681.2×
  96. 96Queenstown Estatelow-cost sensorsSingapore
    681.2×
  97. 96CártamaAndalusia, Spain
    681.2×
  98. 96CauquenesMaule Region, Chile
    681.2×
  99. 99Kampalalow-cost sensorsCentral Region, Uganda
    671.2×
  100. 100Torrancelow-cost sensorsCalifornia, United States
    671.2×
  101. 101TalcaMaule Region, Chile
    671.2×
  102. 101FontanaCalifornia, United States
    671.2×
  103. 103MartinŽilina Region, Slovakia
    671.2×
  104. 103BizenOkayama, Japan
    671.2×
  105. 105Carsonlow-cost sensorsCalifornia, United States
    661.2×
  106. 106OstravaMoravian-Silesian Region, Czechia
    661.1×
  107. 107Mollet del VallèsCatalonia, Spain
    661.1×
  108. 107Novi SadVojvodina, Serbia
    661.1×
  109. 109CartagenaMurcia, Spain
    661.1×
  110. 109AnaheimCalifornia, United States
    661.1×
  111. 111CuencaCastille-La Mancha, Spain
    661.1×
  112. 111CalamaAntofagasta, Chile
    661.1×
  113. 113QuilpuéValparaiso, Chile
    651.1×
  114. 113BartlettTennessee, United States
    651.1×
  115. 115BakuBaki, Azerbaijan
    651.1×
  116. 115ChillánÑuble, Chile
    651.1×
  117. 117KazincbarcikaBorsod-Abaúj-Zemplén, Hungary
    651.1×
  118. 117West MemphisArkansas, United States
    651.1×
  119. 119Maebaru-chūōFukuoka, Japan
    651.1×
  120. 120ColomboWestern Province, Sri Lanka
    651.1×
  121. 120OlomoucOlomouc Region, Czechia
    651.1×
  122. 120RengoO'Higgins Region, Chile
    651.1×
  123. 123MarugameKagawa, Japan
    641.1×
  124. 123MálagaAndalusia, Spain
    641.1×
  125. 125DěčínÚstí nad Labem Region, Czechia
    641.1×
  126. 125Fort McMurrayAlberta, Canada
    641.1×
  127. 127Kan’onjichōKagawa, Japan
    641.1×
  128. 127BogotáBogota D.C., Colombia
    641.1×
  129. 129Quezon Citylow-cost sensorsNational Capital Region, Philippines
    641.1×
  130. 129KurashikiOkayama, Japan
    641.1×
  131. 129KasaokaOkayama, Japan
    641.1×
  132. 129BakersfieldCalifornia, United States
    641.1×
  133. 129KogaFukuoka, Japan
    641.1×
  134. 134Granadilla de AbonaCanary Islands, Spain
    631.1×
  135. 135RiversideCalifornia, United States
    631.0×
  136. 136Mladá BoleslavCentral Bohemia, Czechia
    631.0×
  137. 136Český TěšínMoravian-Silesian Region, Czechia
    631.0×
  138. 136GlendoraCalifornia, United States
    631.0×
  139. 136Santa Monicalow-cost sensorsCalifornia, United States
    631.0×
  140. 140ZentsujichóKagawa, Japan
    631.0×
  141. 140IyoEhime, Japan
    631.0×
  142. 140BurbankCalifornia, United States
    631.0×
  143. 143TakinomiyaKagawa, Japan
    631.0×
  144. 144ConakryConakry, Guinea
    631.0×
  145. 145HigashigōSaga, Japan
    621.0×
  146. 146NagaiYamagata, Japan
    621.0×
  147. 146HavířovMoravian-Silesian Region, Czechia
    621.0×
  148. 148SliemaTas-Sliema, Malta
    621.0×
  149. 148La UniónLos Ríos Region, Chile
    621.0×
  150. 148CorcoranCalifornia, United States
    621.0×
  151. 148MaderaCalifornia, United States
    621.0×
  152. 152NogalesSonora, Mexico
    621.0×
  153. 153AsprópyrgosAttica, Greece
    621.0×
  154. 153NakatsuOita, Japan
    621.0×
  155. 153FukuokaFukuoka, Japan
    621.0×
  156. 153RužomberokŽilina Region, Slovakia
    621.0×
  157. 153HoustonTexas, United States
    621.0×
  158. 153YumaArizona, United States
    621.0×
  159. 159Narutochō-mitsuishiTokushima, Japan
    611.0×
  160. 160NairobiNairobi County, Kenya
    611.0×
  161. 160FujinomiyaShizuoka, Japan
    611.0×
  162. 160GyálPest County, Hungary
    611.0×
  163. 160LitvínovÚstí nad Labem Region, Czechia
    611.0×
  164. 164Islamabadlow-cost sensorsIslamabad, Pakistan
    611.0×
  165. 164YanaiYamaguchi, Japan
    611.0×
  166. 166MinatoWakayama, Japan
    611.0×
  167. 166KurumeFukuoka, Japan
    611.0×
  168. 166Kanzakimachi-kanzakiSaga, Japan
    611.0×
  169. 166OgōriFukuoka, Japan
    611.0×
  170. 170BitolaBitola, North Macedonia
    611.0×
  171. 170SōjaOkayama, Japan
    611.0×
  172. 170ShimonosekiYamaguchi, Japan
    611.0×
  173. 170Nara-shiNara, Japan
    611.0×
  174. 170BailénAndalusia, Spain
    611.0×
  175. 170San DiegoCalifornia, United States
    611.0×
  176. 176ŌmutaFukuoka, Japan
    600.9×
  177. 176Kamojimachō-jōgejimaTokushima, Japan
    600.9×
  178. 176TorreviejaValencia, Spain
    600.9×
  179. 176LleidaCatalonia, Spain
    600.9×
  180. 176Puerto MonttLos Lagos Region, Chile
    600.9×
  181. 176MimaTokushima, Japan
    600.9×
  182. 182TamanaKumamoto, Japan
    600.9×
  183. 182FukuyamaHiroshima, Japan
    600.9×
  184. 184TsuyamaOkayama, Japan
    600.9×
  185. 184ShidoKagawa, Japan
    600.9×
  186. 184KudamatsuYamaguchi, Japan
    600.9×
  187. 184KochiKochi, Japan
    600.9×
  188. 184BohumínMoravian-Silesian Region, Czechia
    600.9×
  189. 189HonmachiKumamoto, Japan
    600.9×
  190. 189ŌzuKumamoto, Japan
    600.9×
  191. 189OnodaYamaguchi, Japan
    600.9×
  192. 189OkayamaOkayama, Japan
    600.9×
  193. 189ArrecifeCanary Islands, Spain
    600.9×
  194. 189LiberecLiberec Region, Czechia
    600.9×
  195. 189Ferry PassFlorida, United States
    600.9×
  196. 189AsakuchiOkayama, Japan
    600.9×
  197. 197UtoKumamoto, Japan
    600.9×
  198. 197UbeYamaguchi, Japan
    600.9×
  199. 197TsurusakiOita, Japan
    600.9×
  200. 197TakahashiOkayama, Japan
    600.9×

Top 200 of 1,724 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 17, 2023, smogrank.com/history/2023-10-17 (accessed 2 Oct 2026).

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