SmogRank / History / October 21, 2023

Most polluted cities on October 21, 2023

1,661 cities ranked by their average PM2.5 over the day; the worst was Lahore, Pakistan, at 161.0 µg/m³. Each city's own local calendar day.

← Lahore 161.0 µg/m³ 100 µg/m³15 WHO 24-hour guideline
Every city ranked for October 21, 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
    23610.7×
  2. 2DelhiDelhi, India
    2088.9×
  3. 3N'DjamenaN’Djaména, Chad
    1967.9×
  4. 4DushanbeDushanbe, Tajikistan
    1867.0×
  5. 5HyderabadTelangana, India
    1675.2×
  6. 6Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1634.8×
  7. 7Dhakalow-cost sensorsDhaka Division, Bangladesh
    1604.6×
  8. 8KolkataWest Bengal, India
    1574.2×
  9. 9MumbaiMaharashtra, India
    1564.2×
  10. 10Ulan BatorUlaanbaatar, Mongolia
    1393.4×
  11. 11ManamaManama, Bahrain
    1363.3×
  12. 12JakartaJakarta, Indonesia
    1353.3×
  13. 13Karachilow-cost sensorsSindh, Pakistan
    1172.8×
  14. 14TetovoTetovo, North Macedonia
    1132.7×
  15. 15ŻabbarĦaż-Żabbar, Malta
    1022.4×
  16. 15Puente AltoSantiago Metropolitan, Chile
    1022.4×
  17. 17SantiagoSantiago Metropolitan, Chile
    982.3×
  18. 18CoyhaiqueAysén, Chile
    972.3×
  19. 19HualpénBiobio, Chile
    962.2×
  20. 20HanoiHanoi, Vietnam
    952.2×
  21. 21PristinaPristina, Kosovo
    932.1×
  22. 22Samut SakhonSamut Sakhon, Thailand
    932.1×
  23. 23Nong KhaemBangkok, Thailand
    922.1×
  24. 24Puerto VarasLos Lagos Region, Chile
    902.0×
  25. 25SliemaTas-Sliema, Malta
    902.0×
  26. 26SalorTashkent Region, Uzbekistan
    871.9×
  27. 27RancaguaO'Higgins Region, Chile
    871.9×
  28. 28DěčínÚstí nad Labem Region, Czechia
    861.9×
  29. 28San CarlosÑuble, Chile
    861.9×
  30. 30CairoCairo, Egypt
    861.8×
  31. 31AntananarivoAnalamanga, Madagascar
    851.8×
  32. 32SarajevoFederation of B&H, Bosnia and Herzegovina
    831.8×
  33. 33TijuanaBaja California, Mexico
    821.7×
  34. 34Kathmandulow-cost sensorsBagmati Province, Nepal
    821.7×
  35. 35Kampalalow-cost sensorsCentral Region, Uganda
    821.7×
  36. 36Tha BoNong Khai, Thailand
    811.7×
  37. 37Abujalow-cost sensorsFCT, Nigeria
    811.7×
  38. 38TalcaMaule Region, Chile
    791.6×
  39. 38TalaganteSantiago Metropolitan, Chile
    791.6×
  40. 40CuricóMaule Region, Chile
    791.6×
  41. 41ToméBiobio, Chile
    781.6×
  42. 41ChillánÑuble, Chile
    781.6×
  43. 43QuillotaValparaiso, Chile
    771.6×
  44. 44MostaIl-Mosta, Malta
    761.5×
  45. 45BangkokBangkok, Thailand
    761.5×
  46. 46HernandoMississippi, United States
    751.5×
  47. 47BucharestBucharest, Romania
    751.5×
  48. 48Phra PradaengSamut Prakan, Thailand
    751.5×
  49. 49CoquimboCoquimbo Region, Chile
    751.5×
  50. 50QuinteroValparaiso, Chile
    741.4×
  51. 50San Pedro de la PazBiobio, Chile
    741.4×
  52. 52Addis AbabaAddis Ababa, Ethiopia
    741.4×
  53. 52RengoO'Higgins Region, Chile
    741.4×
  54. 52CauquenesMaule Region, Chile
    741.4×
  55. 55CuranilahueBiobio, Chile
    731.4×
  56. 55AntofagastaAntofagasta, Chile
    731.4×
  57. 57CoronelBiobio, Chile
    721.4×
  58. 58KazincbarcikaBorsod-Abaúj-Zemplén, Hungary
    721.4×
  59. 58North CowichanBritish Columbia, Canada
    721.4×
  60. 60CopiapóAtacama, Chile
    721.4×
  61. 61TocopillaAntofagasta, Chile
    721.4×
  62. 61LotaBiobio, Chile
    721.4×
  63. 61HualquiBiobio, Chile
    721.4×
  64. 64QuilpuéValparaiso, Chile
    721.3×
  65. 64AltamontOregon, United States
    721.3×
  66. 66OsornoLos Lagos Region, Chile
    711.3×
  67. 67AsprópyrgosAttica, Greece
    711.3×
  68. 68NacimientoBiobio, Chile
    711.3×
  69. 69TalcahuanoBiobio, Chile
    711.3×
  70. 69SalamancaGuanajuato, Mexico
    711.3×
  71. 71La SerenaCoquimbo Region, Chile
    711.3×
  72. 71ConcepciónBiobio, Chile
    711.3×
  73. 71Ciudad JuárezChihuahua, Mexico
    711.3×
  74. 74OpavaMoravian-Silesian Region, Czechia
    711.3×
  75. 74CelayaGuanajuato, Mexico
    711.3×
  76. 76Samut PrakanSamut Prakan, Thailand
    701.3×
  77. 77BakuBaki, Azerbaijan
    701.3×
  78. 77AricaArica y Parinacota Region, Chile
    701.3×
  79. 79Mueang NonthaburiNonthaburi, Thailand
    701.3×
  80. 79Mladá BoleslavCentral Bohemia, Czechia
    701.3×
  81. 81KošiceKošice Region, Slovakia
    701.3×
  82. 82Nakhon PathomNakhon Pathom, Thailand
    691.3×
  83. 82Khlong LuangPathum Thani, Thailand
    691.3×
  84. 82OlomoucOlomouc Region, Czechia
    691.3×
  85. 85ConroeTexas, United States
    691.3×
  86. 86GuangzhouGuangdong, China
    691.3×
  87. 87PardubicePardubice Region, Czechia
    691.2×
  88. 88Viña del MarValparaiso, Chile
    691.2×
  89. 88ConcónValparaiso, Chile
    691.2×
  90. 90Quezon Citylow-cost sensorsNational Capital Region, Philippines
    681.2×
  91. 90Ang Mo Kio New TownSingapore
    681.2×
  92. 90ValdiviaLos Ríos Region, Chile
    681.2×
  93. 93DuncanBritish Columbia, Canada
    681.2×
  94. 94PřerovOlomouc Region, Czechia
    681.2×
  95. 95SkopjeGrad Skopje, North Macedonia
    671.2×
  96. 95Almatylow-cost sensorsAlmaty, Kazakhstan
    671.2×
  97. 95Valašské MeziříčíZlín, Czechia
    671.2×
  98. 98West MemphisArkansas, United States
    671.2×
  99. 99Ústí nad LabemÚstí nad Labem Region, Czechia
    671.2×
  100. 99Frýdek-MístekMoravian-Silesian Region, Czechia
    671.2×
  101. 101CalamaAntofagasta, Chile
    671.2×
  102. 102HavířovMoravian-Silesian Region, Czechia
    661.2×
  103. 102RedmondOregon, United States
    661.2×
  104. 104České BudějoviceSouth Bohemian Region, Czechia
    661.1×
  105. 104BohumínMoravian-Silesian Region, Czechia
    661.1×
  106. 106RuseRuse, Bulgaria
    661.1×
  107. 106ThessaloníkiCentral Macedonia, Greece
    661.1×
  108. 106Alto HospicioTarapacá, Chile
    661.1×
  109. 109BogotáBogota D.C., Colombia
    661.1×
  110. 110La UniónLos Ríos Region, Chile
    651.1×
  111. 110BartlettTennessee, United States
    651.1×
  112. 110GlendaleArizona, United States
    651.1×
  113. 113ŽideniceSouth Moravian, Czechia
    651.1×
  114. 113MostÚstí nad Labem Region, Czechia
    651.1×
  115. 113TemucoAraucania, Chile
    651.1×
  116. 116AthensAttica, Greece
    651.1×
  117. 116Los ÁngelesBiobio, Chile
    651.1×
  118. 116El PasoTexas, United States
    651.1×
  119. 119Cluj-NapocaCluj County, Romania
    641.1×
  120. 120IaşiIași County, Romania
    641.1×
  121. 121Český TěšínMoravian-Silesian Region, Czechia
    641.1×
  122. 121Prince GeorgeBritish Columbia, Canada
    641.1×
  123. 123VisaliaCalifornia, United States
    641.1×
  124. 124NišCentral Serbia, Serbia
    631.1×
  125. 124ColomboWestern Province, Sri Lanka
    631.1×
  126. 126PátraWest Greece, Greece
    631.0×
  127. 126Port ArthurTexas, United States
    631.0×
  128. 128JeddahMecca Region, Saudi Arabia
    631.0×
  129. 128SevillaAndalusia, Spain
    631.0×
  130. 130ZnojmoSouth Moravian, Czechia
    631.0×
  131. 130Baton RougeLouisiana, United States
    631.0×
  132. 132BelgradeCentral Serbia, Serbia
    631.0×
  133. 133LiberecLiberec Region, Czechia
    631.0×
  134. 133Puerto MonttLos Lagos Region, Chile
    631.0×
  135. 135HumennéPrešov Region, Slovakia
    621.0×
  136. 135Ulu BedokSingapore
    621.0×
  137. 135PraguePrague, Czechia
    621.0×
  138. 135BerounCentral Bohemia, Czechia
    621.0×
  139. 139OstravaMoravian-Silesian Region, Czechia
    621.0×
  140. 139Puerto AysénAysén, Chile
    621.0×
  141. 141Banja LukaSrpska, Bosnia and Herzegovina
    621.0×
  142. 141BakersfieldCalifornia, United States
    621.0×
  143. 143TepliceÚstí nad Labem Region, Czechia
    621.0×
  144. 143PilsenPlzeň Region, Czechia
    621.0×
  145. 143Sunland ParkNew Mexico, United States
    621.0×
  146. 146CraiovaDolj, Romania
    621.0×
  147. 146TřinecMoravian-Silesian Region, Czechia
    621.0×
  148. 148NogalesSonora, Mexico
    611.0×
  149. 149Carson CityNevada, United States
    611.0×
  150. 150ReddingCalifornia, United States
    611.0×
  151. 151BrnoSouth Moravian, Czechia
    611.0×
  152. 151CourtenayBritish Columbia, Canada
    611.0×
  153. 153Sydneylow-cost sensorsNew South Wales, Australia
    610.9×
  154. 153TexarkanaTexas, United States
    610.9×
  155. 153RenoNevada, United States
    610.9×
  156. 156SzegedCsongrád, Hungary
    600.9×
  157. 157KavadarciKavadarci, North Macedonia
    600.9×
  158. 157ZlínZlín, Czechia
    600.9×
  159. 157NampaIdaho, United States
    600.9×
  160. 160PrešovPrešov Region, Slovakia
    600.9×
  161. 160AnaheimCalifornia, United States
    600.9×
  162. 162BirminghamAlabama, United States
    600.9×
  163. 162SocorroTexas, United States
    600.9×
  164. 162Grande PrairieAlberta, Canada
    600.9×
  165. 165Spišská Nová VesKošice Region, Slovakia
    590.9×
  166. 165León de los AldamaGuanajuato, Mexico
    590.9×
  167. 165PortervilleCalifornia, United States
    590.9×
  168. 168Queenstown Estatelow-cost sensorsSingapore
    590.9×
  169. 169Novi SadVojvodina, Serbia
    590.9×
  170. 169Casa GrandeArizona, United States
    590.9×
  171. 169FontanaCalifornia, United States
    590.9×
  172. 172AcharnésAttica, Greece
    590.9×
  173. 172BeijingBeijing, China
    590.9×
  174. 174KroměřížZlín, Czechia
    590.9×
  175. 174ShreveportLouisiana, United States
    590.9×
  176. 176BerlinState of Berlin, Germany
    580.9×
  177. 176PécsBaranya, Hungary
    580.9×
  178. 176ValdostaGeorgia, United States
    580.9×
  179. 179BitolaBitola, North Macedonia
    580.9×
  180. 179Silao de la VictoriaGuanajuato, Mexico
    580.9×
  181. 179OceansideCalifornia, United States
    580.9×
  182. 182GyálPest County, Hungary
    580.9×
  183. 182TrnavaTrnava Region, Slovakia
    580.9×
  184. 182IrapuatoGuanajuato, Mexico
    580.9×
  185. 182HattiesburgMississippi, United States
    580.9×
  186. 186KladnoCentral Bohemia, Czechia
    580.8×
  187. 186Asunciónlow-cost sensorsAsuncion, Paraguay
    580.8×
  188. 186LafayetteLouisiana, United States
    580.8×
  189. 186Santa CruzCalifornia, United States
    580.8×
  190. 186Spanish SpringsNevada, United States
    580.8×
  191. 191KhalándrionAttica, Greece
    580.8×
  192. 191TrenčínTrenčín Region, Slovakia
    580.8×
  193. 191KadaňÚstí nad Labem Region, Czechia
    580.8×
  194. 191CorcoranCalifornia, United States
    580.8×
  195. 195ComptonCalifornia, United States
    570.8×
  196. 195Port AlberniBritish Columbia, Canada
    570.8×
  197. 197Chula VistaCalifornia, United States
    570.8×
  198. 197Los AngelesCalifornia, United States
    570.8×
  199. 197LewistonIdaho, United States
    570.8×
  200. 200NairobiNairobi County, Kenya
    570.8×

Top 200 of 1,661 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 21, 2023, smogrank.com/history/2023-10-21 (accessed 2 Oct 2026).

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