SmogRank / History / September 11, 2023

Most polluted cities on September 11, 2023

1,951 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 11, 2023. All episodes.

← Piedras Negras 986.0 µg/m³ 900 µg/m³15 WHO 24-hour guideline
Every city ranked for September 11, 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. 2Fort St. JohnBritish Columbia, Canada
    1856.9×
  3. 3CosladaMadrid, Spain
    1846.8×
  4. 4AlexandriaAlexandria, Egypt
    1715.6×
  5. 5DushanbeDushanbe, Tajikistan
    1645.0×
  6. 6Dhakalow-cost sensorsDhaka Division, Bangladesh
    1634.9×
  7. 7Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1614.6×
  8. 8ThembisaGauteng, South Africa
    1584.3×
  9. 9San Pedro de la PazBiobio, Chile
    1564.2×
  10. 10PretoriaGauteng, South Africa
    1554.0×
  11. 11BritsNorth West, South Africa
    1523.8×
  12. 12Addis AbabaAddis Ababa, Ethiopia
    1443.5×
  13. 13SalorTashkent Region, Uzbekistan
    1383.4×
  14. 14HanoiHanoi, Vietnam
    1363.3×
  15. 15Prince GeorgeBritish Columbia, Canada
    1313.2×
  16. 16OsornoLos Lagos Region, Chile
    1273.1×
  17. 17Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1273.1×
  18. 18Grande PrairieAlberta, Canada
    1233.0×
  19. 19Santa Anita - Los FicusLima region, Peru
    1202.9×
  20. 20NacimientoBiobio, Chile
    1182.8×
  21. 21JakartaJakarta, Indonesia
    1172.8×
  22. 22ŁukówLublin, Poland
    1162.8×
  23. 23Ga-RankuwaNorth West, South Africa
    1102.6×
  24. 23LimaLima Province, Peru
    1102.6×
  25. 25Puerto VarasLos Lagos Region, Chile
    1072.5×
  26. 26La UniónLos Ríos Region, Chile
    1072.5×
  27. 27PassauBavaria, Germany
    1062.5×
  28. 28CoyhaiqueAysén, Chile
    1052.5×
  29. 29Puerto MonttLos Lagos Region, Chile
    992.3×
  30. 30CuranilahueBiobio, Chile
    982.3×
  31. 31Victoria de DurangoDurango, Mexico
    962.2×
  32. 32BeijingBeijing, China
    952.2×
  33. 33MexicaliBaja California, Mexico
    942.2×
  34. 34Ulu BedokSingapore
    922.1×
  35. 35KigaliKigali, Rwanda
    902.0×
  36. 36Puente AltoSantiago Metropolitan, Chile
    902.0×
  37. 36TlaquepaqueJalisco, Mexico
    902.0×
  38. 38BamakoBamako, Mali
    881.9×
  39. 39AmandelbultLimpopo, South Africa
    861.9×
  40. 39AnconaThe Marches, Italy
    861.9×
  41. 41EvatonGauteng, South Africa
    851.8×
  42. 42DębicaSubcarpathia, Poland
    851.8×
  43. 42PristinaPristina, Kosovo
    851.8×
  44. 44ŚwinoujścieWest Pomerania, Poland
    841.8×
  45. 45SantiagoSantiago Metropolitan, Chile
    841.8×
  46. 46VereenigingGauteng, South Africa
    841.8×
  47. 47DurbanKwaZulu-Natal, South Africa
    831.8×
  48. 48ToruńKujawsko-Pomorskie, Poland
    821.7×
  49. 49NairobiNairobi County, Kenya
    821.7×
  50. 49Villa Poeta José Gálvez BarrenecheaLima region, Peru
    821.7×
  51. 51RancaguaO'Higgins Region, Chile
    821.7×
  52. 52Lahorelow-cost sensorsPunjab, Pakistan
    811.7×
  53. 53GrajewoPodlasie, Poland
    811.7×
  54. 54Ang Mo Kio New TownSingapore
    801.7×
  55. 55RadomskoŁódź Voivodeship, Poland
    801.6×
  56. 56SarajevoFederation of B&H, Bosnia and Herzegovina
    801.6×
  57. 57MostÚstí nad Labem Region, Czechia
    791.6×
  58. 58KaliszGreater Poland, Poland
    791.6×
  59. 59BydgoszczKujawsko-Pomorskie, Poland
    791.6×
  60. 59BirminghamAlabama, United States
    791.6×
  61. 61NaplesCampania, Italy
    791.6×
  62. 62LęborkPomerania, Poland
    781.6×
  63. 63OlsztynWarmia-Masuria, Poland
    781.6×
  64. 64ChillánÑuble, Chile
    781.6×
  65. 65DelhiDelhi, India
    781.6×
  66. 65SliemaTas-Sliema, Malta
    781.6×
  67. 65AlessandriaPiedmont, Italy
    781.6×
  68. 68N'DjamenaN’Djaména, Chad
    771.6×
  69. 68HualquiBiobio, Chile
    771.6×
  70. 70Queenstown Estatelow-cost sensorsSingapore
    771.5×
  71. 71LitvínovÚstí nad Labem Region, Czechia
    771.5×
  72. 71KościanGreater Poland, Poland
    771.5×
  73. 71RengoO'Higgins Region, Chile
    771.5×
  74. 74San Francisco De BorjaLima region, Peru
    771.5×
  75. 75KrakówLesser Poland, Poland
    771.5×
  76. 76AntananarivoAnalamanga, Madagascar
    771.5×
  77. 77KościerzynaPomerania, Poland
    761.5×
  78. 77Canvey IslandEngland, United Kingdom
    761.5×
  79. 79WarsawMazovia, Poland
    761.5×
  80. 79GdyniaPomerania, Poland
    761.5×
  81. 81JesiThe Marches, Italy
    761.5×
  82. 81AntofagastaAntofagasta, Chile
    761.5×
  83. 83WłocławekKujawsko-Pomorskie, Poland
    751.5×
  84. 83Falconara MarittimaThe Marches, Italy
    751.5×
  85. 85KielceŚwiętokrzyskie, Poland
    751.5×
  86. 86Los ÁngelesBiobio, Chile
    751.5×
  87. 87ŻabbarĦaż-Żabbar, Malta
    751.5×
  88. 87GdańskPomerania, Poland
    751.5×
  89. 87CauquenesMaule Region, Chile
    751.5×
  90. 90ZamośćLublin, Poland
    751.5×
  91. 90OldenburgLower Saxony, Germany
    751.5×
  92. 92MiskolcBorsod-Abaúj-Zemplén, Hungary
    741.4×
  93. 92TrnavaTrnava Region, Slovakia
    741.4×
  94. 92KristiansandAgder, Norway
    741.4×
  95. 95MielecSubcarpathia, Poland
    741.4×
  96. 96HyderabadTelangana, India
    741.4×
  97. 96SzczecinWest Pomerania, Poland
    741.4×
  98. 96ŁaskŁódź Voivodeship, Poland
    741.4×
  99. 96XonacatlánMéxico, Mexico
    741.4×
  100. 100TepliceÚstí nad Labem Region, Czechia
    741.4×
  101. 101WilhelmshavenLower Saxony, Germany
    741.4×
  102. 101KatowiceSilesia, Poland
    741.4×
  103. 101BolzanoTrentino-Alto Adige, Italy
    741.4×
  104. 104PoznańGreater Poland, Poland
    731.4×
  105. 104VelserbroekNorth Holland, The Netherlands
    731.4×
  106. 106Gorzów WielkopolskiLubusz, Poland
    731.4×
  107. 106São PauloSão Paulo, Brazil
    731.4×
  108. 108BerounCentral Bohemia, Czechia
    731.4×
  109. 109SofiaSofia-Capital, Bulgaria
    731.4×
  110. 109CoronelBiobio, Chile
    731.4×
  111. 111PłockMazovia, Poland
    731.4×
  112. 112MaassluisSouth Holland, The Netherlands
    721.4×
  113. 112PardubicePardubice Region, Czechia
    721.4×
  114. 112DěčínÚstí nad Labem Region, Czechia
    721.4×
  115. 112Jastrzębie ZdrójSilesia, Poland
    721.4×
  116. 116NiskoSubcarpathia, Poland
    721.4×
  117. 117KętrzynWarmia-Masuria, Poland
    721.4×
  118. 117Banja LukaSrpska, Bosnia and Herzegovina
    721.4×
  119. 117CuricóMaule Region, Chile
    721.4×
  120. 117Ciudad JuárezChihuahua, Mexico
    721.4×
  121. 121VentspilsVentspils, Latvia
    721.4×
  122. 121ChennaiTamil Nadu, India
    721.4×
  123. 121ShenyangLiaoning, China
    721.4×
  124. 124MostaIl-Mosta, Malta
    721.3×
  125. 124's-GravenzandeSouth Holland, The Netherlands
    721.3×
  126. 124RacibórzSilesia, Poland
    721.3×
  127. 127ZaanstadNorth Holland, The Netherlands
    711.3×
  128. 127CopiapóAtacama, Chile
    711.3×
  129. 129GuangzhouGuangdong, China
    711.3×
  130. 129TrentoTrentino-Alto Adige, Italy
    711.3×
  131. 131GrazStyria, Austria
    711.3×
  132. 131TalcahuanoBiobio, Chile
    711.3×
  133. 133StarachowiceŚwiętokrzyskie, Poland
    711.3×
  134. 133SenicaTrnava Region, Slovakia
    711.3×
  135. 133Český TěšínMoravian-Silesian Region, Czechia
    711.3×
  136. 136TolucaMéxico, Mexico
    711.3×
  137. 136San Salvador TizatlalliMéxico, Mexico
    711.3×
  138. 138Clacton-on-SeaEngland, United Kingdom
    711.3×
  139. 138ŁódźŁódź Voivodeship, Poland
    711.3×
  140. 138AricaArica y Parinacota Region, Chile
    711.3×
  141. 141GuadalajaraJalisco, Mexico
    701.3×
  142. 142NagaiYamagata, Japan
    701.3×
  143. 142NurembergBavaria, Germany
    701.3×
  144. 142ConcónValparaiso, Chile
    701.3×
  145. 145ObitaNagasaki, Japan
    701.3×
  146. 145Ústí nad LabemÚstí nad Labem Region, Czechia
    701.3×
  147. 147KošiceKošice Region, Slovakia
    701.3×
  148. 147PruszkówMazovia, Poland
    701.3×
  149. 147Velsen-ZuidNorth Holland, The Netherlands
    701.3×
  150. 147Hradec KrálovéHradec Králové Region, Czechia
    701.3×
  151. 147TocopillaAntofagasta, Chile
    701.3×
  152. 147QuinteroValparaiso, Chile
    701.3×
  153. 153Ureshinomachi-shimojukuSaga, Japan
    701.3×
  154. 153TijuanaBaja California, Mexico
    701.3×
  155. 155PrešovPrešov Region, Slovakia
    691.3×
  156. 155RzeszówSubcarpathia, Poland
    691.3×
  157. 155MaldegemFlanders, Belgium
    691.3×
  158. 158ItzehoeSchleswig-Holstein, Germany
    691.3×
  159. 158BremerhavenBremen, Germany
    691.3×
  160. 158ZnojmoSouth Moravian, Czechia
    691.3×
  161. 158KladnoCentral Bohemia, Czechia
    691.3×
  162. 158MiędzyrzeczLubusz, Poland
    691.3×
  163. 163BadhoevedorpNorth Holland, The Netherlands
    691.3×
  164. 163OsnabrückLower Saxony, Germany
    691.3×
  165. 163OlomoucOlomouc Region, Czechia
    691.3×
  166. 166SaseboNagasaki, Japan
    691.2×
  167. 166KashimaSaga, Japan
    691.2×
  168. 166BexleyEngland, United Kingdom
    691.2×
  169. 166OstravaMoravian-Silesian Region, Czechia
    691.2×
  170. 166QuillotaValparaiso, Chile
    691.2×
  171. 166CoquimboCoquimbo Region, Chile
    691.2×
  172. 166Gómez PalacioDurango, Mexico
    691.2×
  173. 166Ciudad ApodacaNuevo León, Mexico
    691.2×
  174. 174RotterdamSouth Holland, The Netherlands
    691.2×
  175. 174LingenLower Saxony, Germany
    691.2×
  176. 174TalaganteSantiago Metropolitan, Chile
    691.2×
  177. 177MyyrmäkiUusimaa, Finland
    691.2×
  178. 177DelmenhorstLower Saxony, Germany
    691.2×
  179. 177BerlinState of Berlin, Germany
    691.2×
  180. 177PřerovOlomouc Region, Czechia
    691.2×
  181. 177ŚwiecieKujawsko-Pomorskie, Poland
    691.2×
  182. 182JeddahMecca Region, Saudi Arabia
    681.2×
  183. 182RadomMazovia, Poland
    681.2×
  184. 184ŌmuraNagasaki, Japan
    681.2×
  185. 184NorrtäljeStockholm, Sweden
    681.2×
  186. 184PurmerendNorth Holland, The Netherlands
    681.2×
  187. 184TemucoAraucania, Chile
    681.2×
  188. 188HonmachiKumamoto, Japan
    681.2×
  189. 188TogitsuNagasaki, Japan
    681.2×
  190. 188Abujalow-cost sensorsFCT, Nigeria
    681.2×
  191. 188FlensburgSchleswig-Holstein, Germany
    681.2×
  192. 188Kędzierzyn-KoźleOpole Voivodeship, Poland
    681.2×
  193. 193LublinLublin, Poland
    681.2×
  194. 193FriesoytheLower Saxony, Germany
    681.2×
  195. 193ElblągWarmia-Masuria, Poland
    681.2×
  196. 196BakuBaki, Azerbaijan
    681.2×
  197. 196ŻyrardówMazovia, Poland
    681.2×
  198. 196PrzemyślSubcarpathia, Poland
    681.2×
  199. 196SmederevoCentral Serbia, Serbia
    681.2×
  200. 196TamanaKumamoto, Japan
    681.2×

Top 200 of 1,951 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 11, 2023, smogrank.com/history/2023-09-11 (accessed 2 Oct 2026).

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