SmogRank / History / September 22, 2023

Most polluted cities on September 22, 2023

1,857 cities ranked by their average PM2.5 over the day; the worst was Coyhaique, Chile, at 74.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during September 22, 2023. All episodes.

← Coyhaique 74.0 µg/m³ 70 µg/m³15 WHO 24-hour guideline
Every city ranked for September 22, 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. 1CoyhaiqueAysén, Chile
    1644.9×
  2. 2Lahorelow-cost sensorsPunjab, Pakistan
    1634.9×
  3. 3Quezon Citylow-cost sensorsNational Capital Region, Philippines
    1363.3×
  4. 4OsornoLos Lagos Region, Chile
    1353.3×
  5. 5Kampalalow-cost sensorsCentral Region, Uganda
    1303.2×
  6. 6DelhiDelhi, India
    1283.1×
  7. 6Puerto VarasLos Lagos Region, Chile
    1283.1×
  8. 8Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1222.9×
  9. 9JakartaJakarta, Indonesia
    1202.9×
  10. 10La UniónLos Ríos Region, Chile
    1182.8×
  11. 11MexicaliBaja California, Mexico
    1102.6×
  12. 12Puerto AysénAysén, Chile
    1062.5×
  13. 13TlaquepaqueJalisco, Mexico
    1052.5×
  14. 14RichmondCalifornia, United States
    1022.4×
  15. 15San RafaelCalifornia, United States
    1012.4×
  16. 16GuangzhouGuangdong, China
    1002.4×
  17. 17NacimientoBiobio, Chile
    992.3×
  18. 18OaklandCalifornia, United States
    982.3×
  19. 18Grants PassOregon, United States
    982.3×
  20. 20StocktonCalifornia, United States
    972.2×
  21. 21AsprópyrgosAttica, Greece
    962.2×
  22. 21MantecaCalifornia, United States
    962.2×
  23. 21Santa RosaCalifornia, United States
    962.2×
  24. 24San JoseCalifornia, United States
    962.2×
  25. 25San FranciscoCalifornia, United States
    952.2×
  26. 25WoodlandCalifornia, United States
    952.2×
  27. 27PristinaPristina, Kosovo
    942.1×
  28. 27ModestoCalifornia, United States
    942.1×
  29. 29San LeandroCalifornia, United States
    942.1×
  30. 30ReginaSaskatchewan, Canada
    932.1×
  31. 31Addis AbabaAddis Ababa, Ethiopia
    932.1×
  32. 32Santa Anita - Los FicusLima region, Peru
    922.1×
  33. 33Redwood CityCalifornia, United States
    922.1×
  34. 33TurlockCalifornia, United States
    922.1×
  35. 35PleasantonCalifornia, United States
    922.1×
  36. 36Arroyo GrandeCalifornia, United States
    912.0×
  37. 37XonacatlánMéxico, Mexico
    912.0×
  38. 38GaltCalifornia, United States
    912.0×
  39. 39RengoO'Higgins Region, Chile
    902.0×
  40. 39SacramentoCalifornia, United States
    902.0×
  41. 41ConcordCalifornia, United States
    902.0×
  42. 42Dhakalow-cost sensorsDhaka Division, Bangladesh
    902.0×
  43. 42UkiahCalifornia, United States
    902.0×
  44. 44RancaguaO'Higgins Region, Chile
    892.0×
  45. 45DavisCalifornia, United States
    881.9×
  46. 46HanfordCalifornia, United States
    881.9×
  47. 46LompocCalifornia, United States
    881.9×
  48. 46NipomoCalifornia, United States
    881.9×
  49. 46SalinasCalifornia, United States
    881.9×
  50. 50BirminghamAlabama, United States
    881.9×
  51. 51San Luis ObispoCalifornia, United States
    881.9×
  52. 51Port AngelesWashington, United States
    881.9×
  53. 53ComptonCalifornia, United States
    861.9×
  54. 53FresnoCalifornia, United States
    861.9×
  55. 53LivermoreCalifornia, United States
    861.9×
  56. 56CorcoranCalifornia, United States
    861.9×
  57. 56MaderaCalifornia, United States
    861.9×
  58. 58Arden-ArcadeCalifornia, United States
    861.8×
  59. 59AthensAttica, Greece
    851.8×
  60. 59Wan ChaiWan Chai, Hong Kong
    851.8×
  61. 61BakersfieldCalifornia, United States
    851.8×
  62. 61TracyCalifornia, United States
    851.8×
  63. 63Şabāḩ as SālimMubārak al Kabīr, Kuwait
    851.8×
  64. 63HanoiHanoi, Vietnam
    851.8×
  65. 63FolsomCalifornia, United States
    851.8×
  66. 63LincolnCalifornia, United States
    851.8×
  67. 63Long BeachCalifornia, United States
    851.8×
  68. 63Santa CruzCalifornia, United States
    851.8×
  69. 69San Francisco TlalcilalcalpanMéxico, Mexico
    851.8×
  70. 70SarajevoFederation of B&H, Bosnia and Herzegovina
    841.8×
  71. 70HollisterCalifornia, United States
    841.8×
  72. 72ValdiviaLos Ríos Region, Chile
    841.8×
  73. 72Yuba CityCalifornia, United States
    841.8×
  74. 74GilroyCalifornia, United States
    841.8×
  75. 74VacavilleCalifornia, United States
    841.8×
  76. 76PortervilleCalifornia, United States
    841.8×
  77. 77ConakryConakry, Guinea
    841.8×
  78. 77LimaLima Province, Peru
    841.8×
  79. 77RosevilleCalifornia, United States
    841.8×
  80. 77VisaliaCalifornia, United States
    841.8×
  81. 81Puerto MonttLos Lagos Region, Chile
    831.8×
  82. 82Santa BarbaraCalifornia, United States
    831.8×
  83. 83Prince AlbertSaskatchewan, Canada
    831.7×
  84. 84Torrancelow-cost sensorsCalifornia, United States
    821.7×
  85. 85Carsonlow-cost sensorsCalifornia, United States
    821.7×
  86. 85MercedCalifornia, United States
    821.7×
  87. 87AcharnésAttica, Greece
    821.7×
  88. 88TolucaMéxico, Mexico
    811.7×
  89. 89OrcuttCalifornia, United States
    811.7×
  90. 90ClovisCalifornia, United States
    801.6×
  91. 91Puente AltoSantiago Metropolitan, Chile
    801.6×
  92. 92CholulaPuebla, Mexico
    801.6×
  93. 93SantiagoSantiago Metropolitan, Chile
    791.6×
  94. 93Hawthornelow-cost sensorsCalifornia, United States
    791.6×
  95. 95Santa CatarinaNuevo León, Mexico
    791.6×
  96. 95AtascaderoCalifornia, United States
    791.6×
  97. 97AnaheimCalifornia, United States
    781.6×
  98. 98GuadalajaraJalisco, Mexico
    781.6×
  99. 99San Luis PotosíSan Luis Potosí, Mexico
    781.6×
  100. 100CuricóMaule Region, Chile
    781.6×
  101. 101Lomitalow-cost sensorsCalifornia, United States
    761.5×
  102. 102CauquenesMaule Region, Chile
    761.5×
  103. 102AricaArica y Parinacota Region, Chile
    761.5×
  104. 104TijuanaBaja California, Mexico
    751.5×
  105. 104Ciudad JuárezChihuahua, Mexico
    751.5×
  106. 104FontanaCalifornia, United States
    751.5×
  107. 107ShenyangLiaoning, China
    751.5×
  108. 107São PauloSão Paulo, Brazil
    751.5×
  109. 109Tha BoNong Khai, Thailand
    751.5×
  110. 109Los AngelesCalifornia, United States
    751.5×
  111. 109MedfordOregon, United States
    751.5×
  112. 112QuillotaValparaiso, Chile
    741.4×
  113. 112Ciudad ApodacaNuevo León, Mexico
    741.4×
  114. 114BeneventoCampania, Italy
    741.4×
  115. 115KhalándrionAttica, Greece
    741.4×
  116. 115BakuBaki, Azerbaijan
    741.4×
  117. 115AntofagastaAntofagasta, Chile
    741.4×
  118. 115Thousand OaksCalifornia, United States
    741.4×
  119. 119Agouralow-cost sensorsCalifornia, United States
    731.4×
  120. 120Ciudad Benito JuárezNuevo León, Mexico
    731.4×
  121. 120Little RockArkansas, United States
    731.4×
  122. 120Inglewoodlow-cost sensorsCalifornia, United States
    731.4×
  123. 120RoseburgOregon, United States
    731.4×
  124. 124AntananarivoAnalamanga, Madagascar
    731.4×
  125. 124Jurupa ValleyCalifornia, United States
    731.4×
  126. 126SalamancaGuanajuato, Mexico
    731.4×
  127. 127PiraeusAttica, Greece
    721.4×
  128. 127TemucoAraucania, Chile
    721.4×
  129. 127SaskatoonSaskatchewan, Canada
    721.4×
  130. 130NaplesCampania, Italy
    721.4×
  131. 131QuinteroValparaiso, Chile
    721.3×
  132. 132SliemaTas-Sliema, Malta
    711.3×
  133. 133San DiegoCalifornia, United States
    711.3×
  134. 133Santa Monicalow-cost sensorsCalifornia, United States
    711.3×
  135. 135Villa Poeta José Gálvez BarrenecheaLima region, Peru
    711.3×
  136. 136RiversideCalifornia, United States
    711.3×
  137. 137ZapopanJalisco, Mexico
    711.3×
  138. 138AstanaAstana, Kazakhstan
    701.3×
  139. 139BangkokBangkok, Thailand
    701.3×
  140. 140FanlingNorth District, Hong Kong
    701.3×
  141. 140CuernavacaMorelos, Mexico
    701.3×
  142. 140TocopillaAntofagasta, Chile
    701.3×
  143. 140CuranilahueBiobio, Chile
    701.3×
  144. 144TalaganteSantiago Metropolitan, Chile
    701.3×
  145. 144BurbankCalifornia, United States
    701.3×
  146. 146ConcónValparaiso, Chile
    691.3×
  147. 147Islamabadlow-cost sensorsIslamabad, Pakistan
    691.3×
  148. 147Bang Bo DistrictSamut Prakan, Thailand
    691.3×
  149. 149BamakoBamako, Mali
    691.3×
  150. 150AnconaThe Marches, Italy
    691.2×
  151. 150CelayaGuanajuato, Mexico
    691.2×
  152. 152OceansideCalifornia, United States
    691.2×
  153. 152PentictonBritish Columbia, Canada
    691.2×
  154. 154SaltilloCoahuila, Mexico
    681.2×
  155. 155KolkataWest Bengal, India
    681.2×
  156. 156Phra PradaengSamut Prakan, Thailand
    681.2×
  157. 156Tuen MunTuen Mun, Hong Kong
    681.2×
  158. 158Ciudad NezahualcoyotlMéxico, Mexico
    671.2×
  159. 159Simi ValleyCalifornia, United States
    671.2×
  160. 160N'DjamenaN’Djaména, Chad
    671.2×
  161. 160CoquimboCoquimbo Region, Chile
    671.2×
  162. 160GainesvilleGeorgia, United States
    671.2×
  163. 160San Francisco De BorjaLima region, Peru
    671.2×
  164. 164La Crescenta-Montroselow-cost sensorsCalifornia, United States
    671.2×
  165. 165Los ÁngelesBiobio, Chile
    661.2×
  166. 165ShreveportLouisiana, United States
    661.2×
  167. 167MiskolcBorsod-Abaúj-Zemplén, Hungary
    661.2×
  168. 167TarnówLesser Poland, Poland
    661.2×
  169. 167Santa ClaritaCalifornia, United States
    661.2×
  170. 167KamloopsBritish Columbia, Canada
    661.2×
  171. 171NairobiNairobi County, Kenya
    661.1×
  172. 171KrakówLesser Poland, Poland
    661.1×
  173. 173TalcahuanoBiobio, Chile
    661.1×
  174. 173CoronelBiobio, Chile
    661.1×
  175. 175HualquiBiobio, Chile
    661.1×
  176. 175TrussvilleAlabama, United States
    661.1×
  177. 177BelgradeCentral Serbia, Serbia
    661.1×
  178. 177La SerenaCoquimbo Region, Chile
    661.1×
  179. 177FillmoreCalifornia, United States
    661.1×
  180. 177AshlandOregon, United States
    661.1×
  181. 177EdmontonAlberta, Canada
    661.1×
  182. 177KelownaBritish Columbia, Canada
    661.1×
  183. 183San CarlosÑuble, Chile
    651.1×
  184. 184Lagoslow-cost sensorsLagos, Nigeria
    651.1×
  185. 184CopiapóAtacama, Chile
    651.1×
  186. 186Viña del MarValparaiso, Chile
    651.1×
  187. 186ChillánÑuble, Chile
    651.1×
  188. 186East Saint LouisIllinois, United States
    651.1×
  189. 186San Pedro de la PazBiobio, Chile
    651.1×
  190. 190HyderabadTelangana, India
    651.1×
  191. 190MonterreyNuevo León, Mexico
    651.1×
  192. 190NapervilleIllinois, United States
    651.1×
  193. 193Alto HospicioTarapacá, Chile
    641.1×
  194. 193CalexicoCalifornia, United States
    641.1×
  195. 193PowayCalifornia, United States
    641.1×
  196. 196Tai PoTai Po, Hong Kong
    641.1×
  197. 196SalernoCampania, Italy
    641.1×
  198. 196Jardines de la SillaNuevo León, Mexico
    641.1×
  199. 199LangfordBritish Columbia, Canada
    641.1×
  200. 200MostaIl-Mosta, Malta
    641.1×

Top 200 of 1,857 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 22, 2023, smogrank.com/history/2023-09-22 (accessed 2 Oct 2026).

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