SmogRank / History / September 25, 2023

Most polluted cities on September 25, 2023

1,962 cities ranked by their average PM2.5 over the day; the worst was Fort St. John, Canada, at 149.0 µg/m³. Each city's own local calendar day.

← Fort St. John 149.0 µg/m³ 100 µg/m³15 WHO 24-hour guideline
Every city ranked for September 25, 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. 1Fort St. JohnBritish Columbia, Canada
    2249.9×
  2. 2CoyhaiqueAysén, Chile
    1594.5×
  3. 3SaltilloCoahuila, Mexico
    1554.1×
  4. 4NacimientoBiobio, Chile
    1533.9×
  5. 5DelhiDelhi, India
    1523.8×
  6. 6OsornoLos Lagos Region, Chile
    1513.7×
  7. 7Puerto VarasLos Lagos Region, Chile
    1403.4×
  8. 8DurbanKwaZulu-Natal, South Africa
    1403.4×
  9. 9Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1343.2×
  10. 10Puerto MonttLos Lagos Region, Chile
    1273.1×
  11. 11Lahorelow-cost sensorsPunjab, Pakistan
    1222.9×
  12. 12JakartaJakarta, Indonesia
    1142.7×
  13. 13La UniónLos Ríos Region, Chile
    1112.6×
  14. 14Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1112.6×
  15. 14HanoiHanoi, Vietnam
    1112.6×
  16. 16Alto HospicioTarapacá, Chile
    1072.5×
  17. 17Kampalalow-cost sensorsCentral Region, Uganda
    1072.5×
  18. 18BritsNorth West, South Africa
    1042.5×
  19. 19Dhakalow-cost sensorsDhaka Division, Bangladesh
    1042.4×
  20. 20BeijingBeijing, China
    982.3×
  21. 21MexicaliBaja California, Mexico
    982.3×
  22. 22LimaLima Province, Peru
    982.3×
  23. 23CuranilahueBiobio, Chile
    972.2×
  24. 24SantiagoSantiago Metropolitan, Chile
    962.2×
  25. 25HualquiBiobio, Chile
    962.2×
  26. 26Santa Anita - Los FicusLima region, Peru
    942.2×
  27. 27BrakpanGauteng, South Africa
    912.1×
  28. 28Addis AbabaAddis Ababa, Ethiopia
    902.0×
  29. 29Puente AltoSantiago Metropolitan, Chile
    902.0×
  30. 30BamakoBamako, Mali
    902.0×
  31. 31CoronelBiobio, Chile
    892.0×
  32. 32JeddahMecca Region, Saudi Arabia
    881.9×
  33. 33Shakaskraallow-cost sensorsKwaZulu-Natal, South Africa
    881.9×
  34. 34BirminghamAlabama, United States
    881.9×
  35. 35FontanaCalifornia, United States
    871.9×
  36. 36Ga-RankuwaNorth West, South Africa
    871.9×
  37. 37ThembisaGauteng, South Africa
    851.8×
  38. 37SalorTashkent Region, Uzbekistan
    851.8×
  39. 39San CarlosÑuble, Chile
    841.8×
  40. 40AsprópyrgosAttica, Greece
    841.8×
  41. 41ToméBiobio, Chile
    831.8×
  42. 42Tha BoNong Khai, Thailand
    831.8×
  43. 43TarnówLesser Poland, Poland
    831.8×
  44. 44TemucoAraucania, Chile
    811.7×
  45. 45Jurupa ValleyCalifornia, United States
    811.7×
  46. 46DushanbeDushanbe, Tajikistan
    811.7×
  47. 47ValdiviaLos Ríos Region, Chile
    801.7×
  48. 48CuricóMaule Region, Chile
    801.7×
  49. 49CallaoCallao, Peru
    801.6×
  50. 50DębicaSubcarpathia, Poland
    801.6×
  51. 50TalcahuanoBiobio, Chile
    801.6×
  52. 50RiversideCalifornia, United States
    801.6×
  53. 53AthensAttica, Greece
    791.6×
  54. 54N'DjamenaN’Djaména, Chad
    791.6×
  55. 54ChillánÑuble, Chile
    791.6×
  56. 56AntananarivoAnalamanga, Madagascar
    791.6×
  57. 57BakuBaki, Azerbaijan
    791.6×
  58. 57TijuanaBaja California, Mexico
    791.6×
  59. 59RancaguaO'Higgins Region, Chile
    781.6×
  60. 60CauquenesMaule Region, Chile
    771.6×
  61. 60AnaheimCalifornia, United States
    771.6×
  62. 62ConcepciónBiobio, Chile
    771.5×
  63. 63Los AngelesCalifornia, United States
    771.5×
  64. 64Phra PradaengSamut Prakan, Thailand
    771.5×
  65. 65QuillotaValparaiso, Chile
    761.5×
  66. 66Nong KhaemBangkok, Thailand
    761.5×
  67. 67StilfonteinNorth West, South Africa
    761.5×
  68. 67KolkataWest Bengal, India
    761.5×
  69. 69PiraeusAttica, Greece
    761.5×
  70. 70San Francisco TlalcilalcalpanMéxico, Mexico
    751.5×
  71. 70Chula VistaCalifornia, United States
    751.5×
  72. 70Torrancelow-cost sensorsCalifornia, United States
    751.5×
  73. 73BangkokBangkok, Thailand
    751.5×
  74. 73XonacatlánMéxico, Mexico
    751.5×
  75. 73ReginaSaskatchewan, Canada
    751.5×
  76. 76Los ÁngelesBiobio, Chile
    751.5×
  77. 77Ang Mo Kio New TownSingapore
    751.5×
  78. 78CopiapóAtacama, Chile
    741.4×
  79. 79AcharnésAttica, Greece
    741.4×
  80. 80SarajevoFederation of B&H, Bosnia and Herzegovina
    741.4×
  81. 80Carsonlow-cost sensorsCalifornia, United States
    741.4×
  82. 82ComptonCalifornia, United States
    741.4×
  83. 83KhalándrionAttica, Greece
    741.4×
  84. 83AntofagastaAntofagasta, Chile
    741.4×
  85. 85PristinaPristina, Kosovo
    731.4×
  86. 85Ulu BedokSingapore
    731.4×
  87. 85OceansideCalifornia, United States
    731.4×
  88. 88Villa Poeta José Gálvez BarrenecheaLima region, Peru
    731.4×
  89. 89San Francisco De BorjaLima region, Peru
    731.4×
  90. 90RengoO'Higgins Region, Chile
    731.4×
  91. 90El CajonCalifornia, United States
    731.4×
  92. 92GuangzhouGuangdong, China
    721.4×
  93. 92Ciudad JuárezChihuahua, Mexico
    721.4×
  94. 94HueytownAlabama, United States
    721.4×
  95. 95TalaganteSantiago Metropolitan, Chile
    721.4×
  96. 95Lomitalow-cost sensorsCalifornia, United States
    721.4×
  97. 95PowayCalifornia, United States
    721.4×
  98. 98Santa Monicalow-cost sensorsCalifornia, United States
    721.4×
  99. 99Inglewoodlow-cost sensorsCalifornia, United States
    721.3×
  100. 100AricaArica y Parinacota Region, Chile
    711.3×
  101. 100Hawthornelow-cost sensorsCalifornia, United States
    711.3×
  102. 100San DiegoCalifornia, United States
    711.3×
  103. 103Bang Bo DistrictSamut Prakan, Thailand
    711.3×
  104. 104CoquimboCoquimbo Region, Chile
    711.3×
  105. 105HyderabadTelangana, India
    701.3×
  106. 105BurbankCalifornia, United States
    701.3×
  107. 105GlendoraCalifornia, United States
    701.3×
  108. 108Long BeachCalifornia, United States
    701.3×
  109. 109Khlong LuangPathum Thani, Thailand
    701.3×
  110. 110QuinteroValparaiso, Chile
    701.3×
  111. 111ConcónValparaiso, Chile
    691.3×
  112. 112NagaiYamagata, Japan
    691.3×
  113. 113Agouralow-cost sensorsCalifornia, United States
    691.2×
  114. 114PretoriaGauteng, South Africa
    691.2×
  115. 114TalcaMaule Region, Chile
    691.2×
  116. 114La SerenaCoquimbo Region, Chile
    691.2×
  117. 117NairobiNairobi County, Kenya
    681.2×
  118. 117Jastrzębie ZdrójSilesia, Poland
    681.2×
  119. 117ZapopanJalisco, Mexico
    681.2×
  120. 120Islamabadlow-cost sensorsIslamabad, Pakistan
    681.2×
  121. 120PortervilleCalifornia, United States
    681.2×
  122. 122Samut SakhonSamut Sakhon, Thailand
    671.2×
  123. 123Samut PrakanSamut Prakan, Thailand
    671.2×
  124. 123Mueang NonthaburiNonthaburi, Thailand
    671.2×
  125. 123ShenyangLiaoning, China
    671.2×
  126. 123SalamancaGuanajuato, Mexico
    671.2×
  127. 123Coeur d'AleneIdaho, United States
    671.2×
  128. 128Puerto AysénAysén, Chile
    671.2×
  129. 128LotaBiobio, Chile
    671.2×
  130. 128CornwallOntario, Canada
    671.2×
  131. 131TocopillaAntofagasta, Chile
    661.2×
  132. 132Quezon Citylow-cost sensorsNational Capital Region, Philippines
    661.1×
  133. 132TolucaMéxico, Mexico
    661.1×
  134. 134NogalesSonora, Mexico
    661.1×
  135. 135FujinomiyaShizuoka, Japan
    661.1×
  136. 136SunnysideWashington, United States
    661.1×
  137. 137TetovoTetovo, North Macedonia
    651.1×
  138. 137KrakówLesser Poland, Poland
    651.1×
  139. 137LondonOntario, Canada
    651.1×
  140. 140Wan ChaiWan Chai, Hong Kong
    651.1×
  141. 140BurlingtonVermont, United States
    651.1×
  142. 140BakersfieldCalifornia, United States
    651.1×
  143. 143OttawaOntario, Canada
    651.1×
  144. 143Prince AlbertSaskatchewan, Canada
    651.1×
  145. 145YakimaWashington, United States
    641.1×
  146. 145GranbyQuebec, Canada
    641.1×
  147. 147VereenigingGauteng, South Africa
    641.1×
  148. 147MedfordOregon, United States
    641.1×
  149. 147Tri-CitiesWashington, United States
    641.1×
  150. 150ŠabacCentral Serbia, Serbia
    641.1×
  151. 150ChiguayanteBiobio, Chile
    641.1×
  152. 150CalamaAntofagasta, Chile
    641.1×
  153. 150Santa CatarinaNuevo León, Mexico
    641.1×
  154. 150RutlandVermont, United States
    641.1×
  155. 155Phenix CityAlabama, United States
    641.1×
  156. 156HernandoMississippi, United States
    631.1×
  157. 156EdmontonAlberta, Canada
    631.1×
  158. 158Thousand OaksCalifornia, United States
    631.0×
  159. 159Viña del MarValparaiso, Chile
    631.0×
  160. 159OakvilleOntario, Canada
    631.0×
  161. 161Bang KapiBangkok, Thailand
    631.0×
  162. 161Little RockArkansas, United States
    631.0×
  163. 161PortlandMaine, United States
    631.0×
  164. 164Queenstown Estatelow-cost sensorsSingapore
    631.0×
  165. 164ColumbusGeorgia, United States
    631.0×
  166. 166PirotCentral Serbia, Serbia
    631.0×
  167. 166Duque de CaxiasRio de Janeiro, Brazil
    631.0×
  168. 166BrossardQuebec, Canada
    631.0×
  169. 166St. ThomasOntario, Canada
    631.0×
  170. 170KingstonOntario, Canada
    621.0×
  171. 171RuseRuse, Bulgaria
    621.0×
  172. 171CholulaPuebla, Mexico
    621.0×
  173. 171TrussvilleAlabama, United States
    621.0×
  174. 171ValdostaGeorgia, United States
    621.0×
  175. 171SherbrookeQuebec, Canada
    621.0×
  176. 176CelayaGuanajuato, Mexico
    621.0×
  177. 176AlbanyNew York, United States
    621.0×
  178. 178ThessaloníkiCentral Macedonia, Greece
    621.0×
  179. 178MaconGeorgia, United States
    621.0×
  180. 178LaconiaNew Hampshire, United States
    621.0×
  181. 178VisaliaCalifornia, United States
    621.0×
  182. 178SpokaneWashington, United States
    621.0×
  183. 183Rivière-des-Prairies–Pointe-aux-TremblesQuebec, Canada
    611.0×
  184. 184Ferry PassFlorida, United States
    611.0×
  185. 185Tepeji del Río de OcampoHidalgo, Mexico
    611.0×
  186. 185AlbanyGeorgia, United States
    611.0×
  187. 185MoscowIdaho, United States
    611.0×
  188. 185BrantfordOntario, Canada
    611.0×
  189. 185MontréalQuebec, Canada
    611.0×
  190. 190La Línea de la ConcepciónAndalusia, Spain
    611.0×
  191. 190LewistonIdaho, United States
    611.0×
  192. 192Lagoslow-cost sensorsLagos, Nigeria
    611.0×
  193. 192Warner RobinsGeorgia, United States
    611.0×
  194. 192Santa BarbaraCalifornia, United States
    611.0×
  195. 192Spokane ValleyWashington, United States
    611.0×
  196. 196BelgradeCentral Serbia, Serbia
    610.9×
  197. 197MontgomeryAlabama, United States
    600.9×
  198. 197Lexingtonlow-cost sensorsMassachusetts, United States
    600.9×
  199. 197DetroitMichigan, United States
    600.9×
  200. 197Simi ValleyCalifornia, United States
    600.9×

Top 200 of 1,962 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, September 25, 2023, smogrank.com/history/2023-09-25 (accessed 2 Oct 2026).

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