SmogRank / History / September 13, 2023

Most polluted cities on September 13, 2023

1,956 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 13, 2023. All episodes.

← Piedras Negras 986.0 µg/m³ 900 µg/m³15 WHO 24-hour guideline
Every city ranked for September 13, 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. 2DushanbeDushanbe, Tajikistan
    23410.6×
  3. 3Tha BoNong Khai, Thailand
    2018.4×
  4. 4Fort McMurrayAlberta, Canada
    1776.2×
  5. 5Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1624.8×
  6. 6Lahorelow-cost sensorsPunjab, Pakistan
    1584.3×
  7. 7NacimientoBiobio, Chile
    1564.1×
  8. 8Prince AlbertSaskatchewan, Canada
    1373.3×
  9. 9AlexandriaAlexandria, Egypt
    1343.3×
  10. 10Islamabadlow-cost sensorsIslamabad, Pakistan
    1333.2×
  11. 11DelhiDelhi, India
    1253.0×
  12. 12JeddahMecca Region, Saudi Arabia
    1243.0×
  13. 13Kampalalow-cost sensorsCentral Region, Uganda
    1182.8×
  14. 14Dhakalow-cost sensorsDhaka Division, Bangladesh
    1172.8×
  15. 15Los ÁngelesBiobio, Chile
    1172.8×
  16. 16ŁukówLublin, Poland
    1132.7×
  17. 17OsornoLos Lagos Region, Chile
    1062.5×
  18. 18SaskatoonSaskatchewan, Canada
    1042.5×
  19. 19AntananarivoAnalamanga, Madagascar
    1042.5×
  20. 20MexicaliBaja California, Mexico
    1032.4×
  21. 21LublinLublin, Poland
    1002.4×
  22. 21San CarlosÑuble, Chile
    1002.4×
  23. 23TalcahuanoBiobio, Chile
    1002.3×
  24. 24Santa Anita - Los FicusLima region, Peru
    992.3×
  25. 25DębicaSubcarpathia, Poland
    992.3×
  26. 26PristinaPristina, Kosovo
    982.3×
  27. 27AugustówPodlasie, Poland
    972.3×
  28. 28CuricóMaule Region, Chile
    972.2×
  29. 29RancaguaO'Higgins Region, Chile
    962.2×
  30. 29Puerto MonttLos Lagos Region, Chile
    962.2×
  31. 31CuranilahueBiobio, Chile
    962.2×
  32. 31LimaLima Province, Peru
    962.2×
  33. 33EdmontonAlberta, Canada
    952.2×
  34. 34N'DjamenaN’Djaména, Chad
    952.2×
  35. 35RadomskoŁódź Voivodeship, Poland
    932.1×
  36. 36Puerto AysénAysén, Chile
    922.1×
  37. 37TolucaMéxico, Mexico
    922.1×
  38. 38TemucoAraucania, Chile
    912.1×
  39. 38San Salvador TizatlalliMéxico, Mexico
    912.1×
  40. 40GrajewoPodlasie, Poland
    912.0×
  41. 40La UniónLos Ríos Region, Chile
    912.0×
  42. 42ZamośćLublin, Poland
    912.0×
  43. 43Puerto VarasLos Lagos Region, Chile
    902.0×
  44. 44HanoiHanoi, Vietnam
    902.0×
  45. 44KrakówLesser Poland, Poland
    902.0×
  46. 44HualquiBiobio, Chile
    902.0×
  47. 47AnconaThe Marches, Italy
    892.0×
  48. 47RengoO'Higgins Region, Chile
    892.0×
  49. 49ChillánÑuble, Chile
    892.0×
  50. 50Şabāḩ as SālimMubārak al Kabīr, Kuwait
    892.0×
  51. 50MielecSubcarpathia, Poland
    892.0×
  52. 50OlomoucOlomouc Region, Czechia
    892.0×
  53. 53NiskoSubcarpathia, Poland
    881.9×
  54. 53KielceŚwiętokrzyskie, Poland
    881.9×
  55. 55Grande PrairieAlberta, Canada
    881.9×
  56. 56KaunasKaunas, Lithuania
    871.9×
  57. 57XonacatlánMéxico, Mexico
    871.9×
  58. 58SuwałkiPodlasie, Poland
    871.9×
  59. 59TarnówLesser Poland, Poland
    861.9×
  60. 60SarajevoFederation of B&H, Bosnia and Herzegovina
    861.9×
  61. 60Puente AltoSantiago Metropolitan, Chile
    861.9×
  62. 62CoyhaiqueAysén, Chile
    861.9×
  63. 63NairobiNairobi County, Kenya
    851.8×
  64. 64SiedlceMazovia, Poland
    851.8×
  65. 65HavířovMoravian-Silesian Region, Czechia
    841.8×
  66. 65Český TěšínMoravian-Silesian Region, Czechia
    841.8×
  67. 67PřerovOlomouc Region, Czechia
    841.8×
  68. 67OstravaMoravian-Silesian Region, Czechia
    841.8×
  69. 69AntofagastaAntofagasta, Chile
    831.8×
  70. 70StarachowiceŚwiętokrzyskie, Poland
    831.8×
  71. 71WarsawMazovia, Poland
    821.7×
  72. 72BiałystokPodlasie, Poland
    821.7×
  73. 73EłkWarmia-Masuria, Poland
    821.7×
  74. 74KaliszGreater Poland, Poland
    821.7×
  75. 75BamakoBamako, Mali
    821.7×
  76. 75San Francisco TlalcilalcalpanMéxico, Mexico
    821.7×
  77. 75San Francisco De BorjaLima region, Peru
    821.7×
  78. 78TrnavaTrnava Region, Slovakia
    811.7×
  79. 78BrnoSouth Moravian, Czechia
    811.7×
  80. 78CauquenesMaule Region, Chile
    811.7×
  81. 81KutnoŁódź Voivodeship, Poland
    811.7×
  82. 82KigaliKigali, Rwanda
    811.7×
  83. 82Ciudad NezahualcoyotlMéxico, Mexico
    811.7×
  84. 82TocopillaAntofagasta, Chile
    811.7×
  85. 82CoronelBiobio, Chile
    811.7×
  86. 86SenicaTrnava Region, Slovakia
    811.7×
  87. 87San Pedro de la PazBiobio, Chile
    811.7×
  88. 88PardubicePardubice Region, Czechia
    801.6×
  89. 88SantiagoSantiago Metropolitan, Chile
    801.6×
  90. 88IndioCalifornia, United States
    801.6×
  91. 91ŽideniceSouth Moravian, Czechia
    801.6×
  92. 92TalcaMaule Region, Chile
    801.6×
  93. 93ŽilinaŽilina Region, Slovakia
    791.6×
  94. 93ZnojmoSouth Moravian, Czechia
    791.6×
  95. 93Jastrzębie ZdrójSilesia, Poland
    791.6×
  96. 96KatowiceSilesia, Poland
    791.6×
  97. 97KętrzynWarmia-Masuria, Poland
    791.6×
  98. 97GrazStyria, Austria
    791.6×
  99. 97ToméBiobio, Chile
    791.6×
  100. 100TlaquepaqueJalisco, Mexico
    781.6×
  101. 101KazincbarcikaBorsod-Abaúj-Zemplén, Hungary
    781.6×
  102. 102CoquimboCoquimbo Region, Chile
    781.6×
  103. 103PułtuskMazovia, Poland
    781.6×
  104. 103Frýdek-MístekMoravian-Silesian Region, Czechia
    781.6×
  105. 105ToruńKujawsko-Pomorskie, Poland
    771.6×
  106. 106ZlínZlín, Czechia
    771.5×
  107. 106OpavaMoravian-Silesian Region, Czechia
    771.5×
  108. 108Samut SakhonSamut Sakhon, Thailand
    771.5×
  109. 109VilniusVilnius, Lithuania
    771.5×
  110. 110QuinteroValparaiso, Chile
    771.5×
  111. 111Kuala LumpurKuala Lumpur, Malaysia
    761.5×
  112. 112KošiceKošice Region, Slovakia
    761.5×
  113. 112LegionowoMazovia, Poland
    761.5×
  114. 112NitraNitra Region, Slovakia
    761.5×
  115. 115PrešovPrešov Region, Slovakia
    761.5×
  116. 115TřinecMoravian-Silesian Region, Czechia
    761.5×
  117. 117Valašské MeziříčíZlín, Czechia
    751.5×
  118. 117OpoleOpole Voivodeship, Poland
    751.5×
  119. 117Villa Poeta José Gálvez BarrenecheaLima region, Peru
    751.5×
  120. 120RacibórzSilesia, Poland
    751.5×
  121. 121MiskolcBorsod-Abaúj-Zemplén, Hungary
    751.5×
  122. 121ZvolenBanská Bystrica Region, Slovakia
    751.5×
  123. 123Almatylow-cost sensorsAlmaty, Kazakhstan
    741.4×
  124. 123CopiapóAtacama, Chile
    741.4×
  125. 125RzeszówSubcarpathia, Poland
    741.4×
  126. 125MartinŽilina Region, Slovakia
    741.4×
  127. 127BratislavaBratislava Region, Slovakia
    741.4×
  128. 127La SerenaCoquimbo Region, Chile
    741.4×
  129. 127ConcepciónBiobio, Chile
    741.4×
  130. 130Vranov nad TopľouPrešov Region, Slovakia
    741.4×
  131. 130WolfsbergCarinthia, Austria
    741.4×
  132. 132PueblaPuebla, Mexico
    741.4×
  133. 133KroměřížZlín, Czechia
    741.4×
  134. 133KrapkowiceOpole Voivodeship, Poland
    741.4×
  135. 135RadomMazovia, Poland
    731.4×
  136. 135Hradec KrálovéHradec Králové Region, Czechia
    731.4×
  137. 135Naucalpan de JuárezMéxico, Mexico
    731.4×
  138. 138KlaipėdaKlaipėda County, Lithuania
    731.4×
  139. 139São PauloSão Paulo, Brazil
    731.4×
  140. 140PrievidzaTrenčín Region, Slovakia
    731.4×
  141. 140WłocławekKujawsko-Pomorskie, Poland
    731.4×
  142. 140ZapopanJalisco, Mexico
    731.4×
  143. 143QuillotaValparaiso, Chile
    731.4×
  144. 144TrentoTrentino-Alto Adige, Italy
    721.4×
  145. 144AricaArica y Parinacota Region, Chile
    721.4×
  146. 146VeszprémVeszprém, Hungary
    721.4×
  147. 146Žiar nad HronomBanská Bystrica Region, Slovakia
    721.4×
  148. 146RužomberokŽilina Region, Slovakia
    721.4×
  149. 149ChennaiTamil Nadu, India
    721.4×
  150. 149DěčínÚstí nad Labem Region, Czechia
    721.4×
  151. 151TalaganteSantiago Metropolitan, Chile
    721.3×
  152. 151ChiguayanteBiobio, Chile
    721.3×
  153. 153DunaújvárosFejér, Hungary
    711.3×
  154. 153Kędzierzyn-KoźleOpole Voivodeship, Poland
    711.3×
  155. 155HumennéPrešov Region, Slovakia
    711.3×
  156. 156TrenčínTrenčín Region, Slovakia
    711.3×
  157. 157Mladá BoleslavCentral Bohemia, Czechia
    711.3×
  158. 157ŁódźŁódź Voivodeship, Poland
    711.3×
  159. 159HyderabadTelangana, India
    711.3×
  160. 160OlsztynWarmia-Masuria, Poland
    701.3×
  161. 160MostÚstí nad Labem Region, Czechia
    701.3×
  162. 162Czechowice-DziedziceSilesia, Poland
    701.3×
  163. 163Addis AbabaAddis Ababa, Ethiopia
    701.3×
  164. 163BydgoszczKujawsko-Pomorskie, Poland
    701.3×
  165. 163Banja LukaSrpska, Bosnia and Herzegovina
    701.3×
  166. 166Mexico CityMexico City, Mexico
    701.3×
  167. 167LiberecLiberec Region, Czechia
    701.3×
  168. 168NaplesCampania, Italy
    691.3×
  169. 169NyíregyházaSzabolcs-Szatmár-Bereg, Hungary
    691.3×
  170. 169GuangzhouGuangdong, China
    691.3×
  171. 169SliemaTas-Sliema, Malta
    691.3×
  172. 169Klagenfurt am WörtherseeCarinthia, Austria
    691.3×
  173. 169LęborkPomerania, Poland
    691.3×
  174. 169GuadalajaraJalisco, Mexico
    691.3×
  175. 175BelgradeCentral Serbia, Serbia
    691.3×
  176. 175PartizánskeTrenčín Region, Slovakia
    691.3×
  177. 175BolzanoTrentino-Alto Adige, Italy
    691.3×
  178. 178PoznańGreater Poland, Poland
    691.2×
  179. 178ConcónValparaiso, Chile
    691.2×
  180. 180KolkataWest Bengal, India
    691.2×
  181. 180TepliceÚstí nad Labem Region, Czechia
    691.2×
  182. 182PécsBaranya, Hungary
    691.2×
  183. 183RigaRiga, Latvia
    681.2×
  184. 183PopradPrešov Region, Slovakia
    681.2×
  185. 183WawerMazovia, Poland
    681.2×
  186. 183LitvínovÚstí nad Labem Region, Czechia
    681.2×
  187. 187Spišská Nová VesKošice Region, Slovakia
    681.2×
  188. 187TetovoTetovo, North Macedonia
    681.2×
  189. 187MostaIl-Mosta, Malta
    681.2×
  190. 187WrocławLower Silesia, Poland
    681.2×
  191. 191GyőrGyőr-Moson-Sopron, Hungary
    681.2×
  192. 192PrzemyślSubcarpathia, Poland
    671.2×
  193. 192ShenyangLiaoning, China
    671.2×
  194. 194BerounCentral Bohemia, Czechia
    671.2×
  195. 194RoveretoTrentino-Alto Adige, Italy
    671.2×
  196. 194Viña del MarValparaiso, Chile
    671.2×
  197. 197SninaPrešov Region, Slovakia
    671.2×
  198. 197Falconara MarittimaThe Marches, Italy
    671.2×
  199. 199TijuanaBaja California, Mexico
    671.2×
  200. 200KościanGreater Poland, Poland
    661.2×

Top 200 of 1,956 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 13, 2023, smogrank.com/history/2023-09-13 (accessed 2 Oct 2026).

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