SmogRank / History / September 17, 2023

Most polluted cities on September 17, 2023

1,887 cities ranked by their average PM2.5 over the day; the worst was Piedras Negras, Mexico, at 986.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during September 17, 2023. All episodes.

← Piedras Negras 986.0 µg/m³ 900 µg/m³15 WHO 24-hour guideline
Every city ranked for September 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. 1Piedras NegrasCoahuila, Mexico
    500+65.7×
  2. 2Grande PrairieAlberta, Canada
    28213.8×
  3. 3EdmontonAlberta, Canada
    1978.1×
  4. 4Fort McMurrayAlberta, Canada
    1695.4×
  5. 5St. AlbertAlberta, Canada
    1675.2×
  6. 6Prince GeorgeBritish Columbia, Canada
    1614.6×
  7. 7Sherwood ParkAlberta, Canada
    1574.3×
  8. 8BeijingBeijing, China
    1533.9×
  9. 9NacimientoBiobio, Chile
    1533.9×
  10. 10RedmondOregon, United States
    1533.9×
  11. 11Fort St. JohnBritish Columbia, Canada
    1523.8×
  12. 12Dhakalow-cost sensorsDhaka Division, Bangladesh
    1513.7×
  13. 13Red DeerAlberta, Canada
    1443.5×
  14. 14OsornoLos Lagos Region, Chile
    1443.5×
  15. 15ShenyangLiaoning, China
    1403.4×
  16. 16BamakoBamako, Mali
    1373.3×
  17. 17DushanbeDushanbe, Tajikistan
    1303.1×
  18. 18La UniónLos Ríos Region, Chile
    1293.1×
  19. 19Los ÁngelesBiobio, Chile
    1273.1×
  20. 20HanoiHanoi, Vietnam
    1182.8×
  21. 21Puerto VarasLos Lagos Region, Chile
    1112.6×
  22. 22Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1092.6×
  23. 22Puerto MonttLos Lagos Region, Chile
    1092.6×
  24. 24MarratxíBalearic Islands, Spain
    1082.6×
  25. 25JakartaJakarta, Indonesia
    1032.4×
  26. 26Quezon Citylow-cost sensorsNational Capital Region, Philippines
    1032.4×
  27. 27OmahaNebraska, United States
    1012.4×
  28. 28BellevueNebraska, United States
    1012.4×
  29. 29Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1002.4×
  30. 30PalmaBalearic Islands, Spain
    1002.4×
  31. 31LincolnNebraska, United States
    1002.3×
  32. 32CoyhaiqueAysén, Chile
    992.3×
  33. 33AlgiersAlgiers, Algeria
    972.3×
  34. 34MexicaliBaja California, Mexico
    962.2×
  35. 35Ciudad NezahualcoyotlMéxico, Mexico
    962.2×
  36. 36XonacatlánMéxico, Mexico
    962.2×
  37. 36TalcahuanoBiobio, Chile
    962.2×
  38. 38Villa Poeta José Gálvez BarrenecheaLima region, Peru
    932.1×
  39. 39Kansas CityKansas, United States
    932.1×
  40. 40San Francisco TlalcilalcalpanMéxico, Mexico
    922.1×
  41. 41San CarlosÑuble, Chile
    912.1×
  42. 42ToméBiobio, Chile
    912.0×
  43. 43SarajevoFederation of B&H, Bosnia and Herzegovina
    912.0×
  44. 44AntananarivoAnalamanga, Madagascar
    902.0×
  45. 45SofiaSofia-Capital, Bulgaria
    892.0×
  46. 46PristinaPristina, Kosovo
    892.0×
  47. 47Lahorelow-cost sensorsPunjab, Pakistan
    892.0×
  48. 48Addis AbabaAddis Ababa, Ethiopia
    881.9×
  49. 49OlatheKansas, United States
    871.9×
  50. 50ChillánÑuble, Chile
    851.8×
  51. 50TopekaKansas, United States
    851.8×
  52. 52San Salvador TizatlalliMéxico, Mexico
    841.8×
  53. 53LimaLima Province, Peru
    841.8×
  54. 53ReginaSaskatchewan, Canada
    841.8×
  55. 55BendOregon, United States
    831.8×
  56. 56HualquiBiobio, Chile
    831.7×
  57. 57IndioCalifornia, United States
    831.7×
  58. 58Santa Anita - Los FicusLima region, Peru
    821.7×
  59. 59IndianapolisIndiana, United States
    821.7×
  60. 60HernandoMississippi, United States
    821.7×
  61. 61TolucaMéxico, Mexico
    811.7×
  62. 62CoronelBiobio, Chile
    811.7×
  63. 63AstanaAstana, Kazakhstan
    801.7×
  64. 64AricaArica y Parinacota Region, Chile
    801.7×
  65. 65TemucoAraucania, Chile
    801.6×
  66. 66Prince AlbertSaskatchewan, Canada
    801.6×
  67. 67ConcepciónBiobio, Chile
    791.6×
  68. 68CauquenesMaule Region, Chile
    781.6×
  69. 69KelownaBritish Columbia, Canada
    781.6×
  70. 70San Francisco De BorjaLima region, Peru
    771.6×
  71. 71AntofagastaAntofagasta, Chile
    771.5×
  72. 71MedfordOregon, United States
    771.5×
  73. 73DelmenhorstLower Saxony, Germany
    771.5×
  74. 73CuranilahueBiobio, Chile
    771.5×
  75. 75NaplesCampania, Italy
    771.5×
  76. 75Naucalpan de JuárezMéxico, Mexico
    771.5×
  77. 75Saint JosephMissouri, United States
    771.5×
  78. 78HonmachiKumamoto, Japan
    761.5×
  79. 79NairobiNairobi County, Kenya
    761.5×
  80. 80Kansas CityMissouri, United States
    761.5×
  81. 81EvergemFlanders, Belgium
    751.5×
  82. 81Saint-ChamondAuvergne-Rhône-Alpes, France
    751.5×
  83. 83Saint-ÉtienneAuvergne-Rhône-Alpes, France
    751.5×
  84. 84MinamataKumamoto, Japan
    741.4×
  85. 85Islamabadlow-cost sensorsIslamabad, Pakistan
    741.4×
  86. 86CoquimboCoquimbo Region, Chile
    741.4×
  87. 87San Pedro de la PazBiobio, Chile
    731.4×
  88. 88ValdiviaLos Ríos Region, Chile
    731.4×
  89. 88AshlandOregon, United States
    731.4×
  90. 90CardiffWales, United Kingdom
    731.4×
  91. 91LibertyMissouri, United States
    731.4×
  92. 91ChikuseiIbaraki, Japan
    731.4×
  93. 93PerpignanOccitanie, France
    721.4×
  94. 93Mexico CityMexico City, Mexico
    721.4×
  95. 95GuangzhouGuangdong, China
    721.4×
  96. 95DartfordEngland, United Kingdom
    721.4×
  97. 95Alto HospicioTarapacá, Chile
    721.4×
  98. 98MaldegemFlanders, Belgium
    721.4×
  99. 98QuillotaValparaiso, Chile
    721.4×
  100. 100Grants PassOregon, United States
    721.4×
  101. 101AnconaThe Marches, Italy
    721.3×
  102. 102KolkataWest Bengal, India
    711.3×
  103. 102NagaiYamagata, Japan
    711.3×
  104. 104SalorTashkent Region, Uzbekistan
    711.3×
  105. 104Ulu BedokSingapore
    711.3×
  106. 106SanoTochigi, Japan
    711.3×
  107. 106MarseilleProvence-Alpes-Côte d'Azur, France
    711.3×
  108. 108HyderabadTelangana, India
    711.3×
  109. 109NiihamaEhime, Japan
    711.3×
  110. 109CuricóMaule Region, Chile
    711.3×
  111. 111Puente AltoSantiago Metropolitan, Chile
    701.3×
  112. 111AltamontOregon, United States
    701.3×
  113. 113Kuala LumpurKuala Lumpur, Malaysia
    701.3×
  114. 113TocopillaAntofagasta, Chile
    701.3×
  115. 113QuinteroValparaiso, Chile
    701.3×
  116. 116RaymoreMissouri, United States
    691.3×
  117. 117DelhiDelhi, India
    691.3×
  118. 117BanningCalifornia, United States
    691.3×
  119. 119OldenburgLower Saxony, Germany
    691.3×
  120. 119SantiagoSantiago Metropolitan, Chile
    691.3×
  121. 119BartlettTennessee, United States
    691.3×
  122. 122La SerenaCoquimbo Region, Chile
    691.2×
  123. 123TsurusakiOita, Japan
    691.2×
  124. 123São PauloSão Paulo, Brazil
    691.2×
  125. 125IyoEhime, Japan
    691.2×
  126. 125Canvey IslandEngland, United Kingdom
    691.2×
  127. 127KiryūGunma, Japan
    681.2×
  128. 127IzegemFlanders, Belgium
    681.2×
  129. 129HagiYamaguchi, Japan
    681.2×
  130. 129ChiguayanteBiobio, Chile
    681.2×
  131. 131GrenobleAuvergne-Rhône-Alpes, France
    681.2×
  132. 131AvignonProvence-Alpes-Côte d'Azur, France
    681.2×
  133. 131Puerto AysénAysén, Chile
    681.2×
  134. 131ConcónValparaiso, Chile
    681.2×
  135. 131RichmondCalifornia, United States
    681.2×
  136. 136Karachilow-cost sensorsSindh, Pakistan
    681.2×
  137. 136GivorsAuvergne-Rhône-Alpes, France
    681.2×
  138. 138Ang Mo Kio New TownSingapore
    681.2×
  139. 138Falconara MarittimaThe Marches, Italy
    681.2×
  140. 140TakasakiGunma, Japan
    671.2×
  141. 140ArlesProvence-Alpes-Côte d'Azur, France
    671.2×
  142. 142NobeokaMiyazaki, Japan
    671.2×
  143. 142CopiapóAtacama, Chile
    671.2×
  144. 142AnkenyIowa, United States
    671.2×
  145. 145NagoOkinawa, Japan
    671.2×
  146. 145KasaokaOkayama, Japan
    671.2×
  147. 147ChennaiTamil Nadu, India
    671.2×
  148. 147RoeselareFlanders, Belgium
    671.2×
  149. 149Almatylow-cost sensorsAlmaty, Kazakhstan
    671.2×
  150. 149YamaguchiYamaguchi, Japan
    671.2×
  151. 149BremerhavenBremen, Germany
    671.2×
  152. 152FriesoytheLower Saxony, Germany
    661.2×
  153. 152Salon-de-ProvenceProvence-Alpes-Côte d'Azur, France
    661.2×
  154. 152TalcaMaule Region, Chile
    661.2×
  155. 152RancaguaO'Higgins Region, Chile
    661.2×
  156. 156ZwijndrechtFlanders, Belgium
    661.2×
  157. 156WaregemFlanders, Belgium
    661.2×
  158. 156Romans-sur-IsèreAuvergne-Rhône-Alpes, France
    661.2×
  159. 159DunkirkHauts-de-France, France
    661.1×
  160. 159JesiThe Marches, Italy
    661.1×
  161. 161TakaokaToyama, Japan
    661.1×
  162. 161CalgaryAlberta, Canada
    661.1×
  163. 163Kan’onjichōKagawa, Japan
    661.1×
  164. 163MenenFlanders, Belgium
    661.1×
  165. 165ValenceAuvergne-Rhône-Alpes, France
    661.1×
  166. 165DěčínÚstí nad Labem Region, Czechia
    661.1×
  167. 165GdańskPomerania, Poland
    661.1×
  168. 165RengoO'Higgins Region, Chile
    661.1×
  169. 165Des MoinesIowa, United States
    661.1×
  170. 165Grand RapidsMichigan, United States
    661.1×
  171. 171NakatsuOita, Japan
    651.1×
  172. 171ImabariEhime, Japan
    651.1×
  173. 171BeverenFlanders, Belgium
    651.1×
  174. 171PentictonBritish Columbia, Canada
    651.1×
  175. 171ShikokuchūōEhime, Japan
    651.1×
  176. 176LondonEngland, United Kingdom
    651.1×
  177. 176StabroekFlanders, Belgium
    651.1×
  178. 176SalernoCampania, Italy
    651.1×
  179. 176DetroitMichigan, United States
    651.1×
  180. 180NišCentral Serbia, Serbia
    651.1×
  181. 180LyonAuvergne-Rhône-Alpes, France
    651.1×
  182. 180Fos-sur-MerProvence-Alpes-Côte d'Azur, France
    651.1×
  183. 180FontanaCalifornia, United States
    651.1×
  184. 184ŌzuKumamoto, Japan
    651.1×
  185. 184MitoIbaraki, Japan
    651.1×
  186. 184ToulouseOccitanie, France
    651.1×
  187. 184Baton RougeLouisiana, United States
    651.1×
  188. 188ZentsujichóKagawa, Japan
    641.1×
  189. 188SaijōEhime, Japan
    641.1×
  190. 188LingenLower Saxony, Germany
    641.1×
  191. 188MontpellierOccitanie, France
    641.1×
  192. 188LunelOccitanie, France
    641.1×
  193. 188JacksonMississippi, United States
    641.1×
  194. 194Botevgradlow-cost sensorsSofia, Bulgaria
    641.1×
  195. 194Tottori-shiTottori, Japan
    641.1×
  196. 194CalamaAntofagasta, Chile
    641.1×
  197. 197KōriyamaFukushima, Japan
    641.1×
  198. 197VitrollesProvence-Alpes-Côte d'Azur, France
    641.1×
  199. 197GardanneProvence-Alpes-Côte d'Azur, France
    641.1×
  200. 200ColomboWestern Province, Sri Lanka
    641.1×

Top 200 of 1,887 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 17, 2023, smogrank.com/history/2023-09-17 (accessed 2 Oct 2026).

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