SmogRank / History / September 12, 2023

Most polluted cities on September 12, 2023

1,883 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 12, 2023. All episodes.

← Piedras Negras 986.0 µg/m³ 900 µg/m³15 WHO 24-hour guideline
Every city ranked for September 12, 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. 3Fort St. JohnBritish Columbia, Canada
    2199.6×
  4. 4AlexandriaAlexandria, Egypt
    2088.9×
  5. 5NacimientoBiobio, Chile
    1685.4×
  6. 6Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1604.6×
  7. 7Fort McMurrayAlberta, Canada
    1584.4×
  8. 8Addis AbabaAddis Ababa, Ethiopia
    1554.1×
  9. 9Islamabadlow-cost sensorsIslamabad, Pakistan
    1473.6×
  10. 10SalorTashkent Region, Uzbekistan
    1283.1×
  11. 11CuranilahueBiobio, Chile
    1273.1×
  12. 12HanoiHanoi, Vietnam
    1263.1×
  13. 13Dhakalow-cost sensorsDhaka Division, Bangladesh
    1263.0×
  14. 14Santa Anita - Los FicusLima region, Peru
    1243.0×
  15. 15Lahorelow-cost sensorsPunjab, Pakistan
    1202.9×
  16. 16Los ÁngelesBiobio, Chile
    1162.8×
  17. 17EdmontonAlberta, Canada
    1132.7×
  18. 18Puerto AysénAysén, Chile
    1122.7×
  19. 19KigaliKigali, Rwanda
    1112.6×
  20. 20DębicaSubcarpathia, Poland
    1082.6×
  21. 21TalcahuanoBiobio, Chile
    1052.5×
  22. 21OsornoLos Lagos Region, Chile
    1052.5×
  23. 23ŁukówLublin, Poland
    1042.5×
  24. 24Puerto VarasLos Lagos Region, Chile
    1012.4×
  25. 24Grande PrairieAlberta, Canada
    1012.4×
  26. 26La UniónLos Ríos Region, Chile
    1012.4×
  27. 27Puerto MonttLos Lagos Region, Chile
    992.3×
  28. 28DunaújvárosFejér, Hungary
    962.2×
  29. 29Prince GeorgeBritish Columbia, Canada
    962.2×
  30. 30ZamośćLublin, Poland
    962.2×
  31. 31CoyhaiqueAysén, Chile
    952.2×
  32. 32AnconaThe Marches, Italy
    952.2×
  33. 33MexicaliBaja California, Mexico
    942.2×
  34. 34PristinaPristina, Kosovo
    942.1×
  35. 35ToméBiobio, Chile
    942.1×
  36. 36DelhiDelhi, India
    932.1×
  37. 37HualquiBiobio, Chile
    922.1×
  38. 38LublinLublin, Poland
    922.1×
  39. 39ChiguayanteBiobio, Chile
    912.0×
  40. 39LimaLima Province, Peru
    912.0×
  41. 41RadomskoŁódź Voivodeship, Poland
    912.0×
  42. 41KrakówLesser Poland, Poland
    912.0×
  43. 43PułtuskMazovia, Poland
    912.0×
  44. 44MielecSubcarpathia, Poland
    902.0×
  45. 45AntananarivoAnalamanga, Madagascar
    902.0×
  46. 46SarajevoFederation of B&H, Bosnia and Herzegovina
    892.0×
  47. 47CoronelBiobio, Chile
    881.9×
  48. 48KaliszGreater Poland, Poland
    881.9×
  49. 49TemucoAraucania, Chile
    881.9×
  50. 49TlaquepaqueJalisco, Mexico
    881.9×
  51. 51GrajewoPodlasie, Poland
    871.9×
  52. 51KutnoŁódź Voivodeship, Poland
    871.9×
  53. 53ToruńKujawsko-Pomorskie, Poland
    871.9×
  54. 54KielceŚwiętokrzyskie, Poland
    871.9×
  55. 55NiskoSubcarpathia, Poland
    851.8×
  56. 56SiedlceMazovia, Poland
    851.8×
  57. 57OlomoucOlomouc Region, Czechia
    851.8×
  58. 58TrnavaTrnava Region, Slovakia
    851.8×
  59. 59CauquenesMaule Region, Chile
    841.8×
  60. 60StabroekFlanders, Belgium
    841.8×
  61. 61BydgoszczKujawsko-Pomorskie, Poland
    841.8×
  62. 61ConcepciónBiobio, Chile
    841.8×
  63. 63EłkWarmia-Masuria, Poland
    841.8×
  64. 64NairobiNairobi County, Kenya
    841.8×
  65. 65KościanGreater Poland, Poland
    831.8×
  66. 66ZwijndrechtFlanders, Belgium
    831.7×
  67. 67KatowiceSilesia, Poland
    831.7×
  68. 68GrazStyria, Austria
    821.7×
  69. 69BolzanoTrentino-Alto Adige, Italy
    821.7×
  70. 70Ulu BedokSingapore
    821.7×
  71. 70LęborkPomerania, Poland
    821.7×
  72. 70San Francisco TlalcilalcalpanMéxico, Mexico
    821.7×
  73. 73TolucaMéxico, Mexico
    821.7×
  74. 73BirminghamAlabama, United States
    821.7×
  75. 75LegionowoMazovia, Poland
    811.7×
  76. 76WarsawMazovia, Poland
    811.7×
  77. 76PřerovOlomouc Region, Czechia
    811.7×
  78. 76ŁaskŁódź Voivodeship, Poland
    811.7×
  79. 76NaplesCampania, Italy
    811.7×
  80. 80GdańskPomerania, Poland
    801.7×
  81. 81LitvínovÚstí nad Labem Region, Czechia
    801.7×
  82. 82AugustówPodlasie, Poland
    801.6×
  83. 82TepliceÚstí nad Labem Region, Czechia
    801.6×
  84. 82San Salvador TizatlalliMéxico, Mexico
    801.6×
  85. 85Ang Mo Kio New TownSingapore
    801.6×
  86. 86Şabāḩ as SālimMubārak al Kabīr, Kuwait
    801.6×
  87. 87ŚwinoujścieWest Pomerania, Poland
    791.6×
  88. 88AntwerpFlanders, Belgium
    791.6×
  89. 88OstravaMoravian-Silesian Region, Czechia
    791.6×
  90. 90TarnówLesser Poland, Poland
    791.6×
  91. 90BeverenFlanders, Belgium
    791.6×
  92. 90TrentoTrentino-Alto Adige, Italy
    791.6×
  93. 93StarachowiceŚwiętokrzyskie, Poland
    791.6×
  94. 93WłocławekKujawsko-Pomorskie, Poland
    791.6×
  95. 93Jastrzębie ZdrójSilesia, Poland
    791.6×
  96. 96MostÚstí nad Labem Region, Czechia
    791.6×
  97. 96KościerzynaPomerania, Poland
    791.6×
  98. 98Kuala LumpurKuala Lumpur, Malaysia
    781.6×
  99. 98ZnojmoSouth Moravian, Czechia
    781.6×
  100. 98GdyniaPomerania, Poland
    781.6×
  101. 101SenicaTrnava Region, Slovakia
    781.6×
  102. 102PoznańGreater Poland, Poland
    781.6×
  103. 102San CarlosÑuble, Chile
    781.6×
  104. 104RacibórzSilesia, Poland
    781.6×
  105. 105KętrzynWarmia-Masuria, Poland
    771.5×
  106. 105KapellenFlanders, Belgium
    771.5×
  107. 105BohumínMoravian-Silesian Region, Czechia
    771.5×
  108. 105TocopillaAntofagasta, Chile
    771.5×
  109. 105ChillánÑuble, Chile
    771.5×
  110. 110BiałystokPodlasie, Poland
    771.5×
  111. 110BratislavaBratislava Region, Slovakia
    771.5×
  112. 112MiędzyrzeczLubusz, Poland
    771.5×
  113. 113Gorzów WielkopolskiLubusz, Poland
    771.5×
  114. 113ShreveportLouisiana, United States
    771.5×
  115. 115EvergemFlanders, Belgium
    761.5×
  116. 115HavířovMoravian-Silesian Region, Czechia
    761.5×
  117. 117ŽideniceSouth Moravian, Czechia
    761.5×
  118. 118Falconara MarittimaThe Marches, Italy
    761.5×
  119. 118XonacatlánMéxico, Mexico
    761.5×
  120. 120DěčínÚstí nad Labem Region, Czechia
    761.5×
  121. 121Gómez PalacioDurango, Mexico
    761.5×
  122. 122LochristiFlanders, Belgium
    751.5×
  123. 122PardubicePardubice Region, Czechia
    751.5×
  124. 122CoquimboCoquimbo Region, Chile
    751.5×
  125. 125SuwałkiPodlasie, Poland
    751.5×
  126. 126NitraNitra Region, Slovakia
    751.5×
  127. 126Český TěšínMoravian-Silesian Region, Czechia
    751.5×
  128. 126Kędzierzyn-KoźleOpole Voivodeship, Poland
    751.5×
  129. 126AntofagastaAntofagasta, Chile
    751.5×
  130. 130PłockMazovia, Poland
    751.5×
  131. 130JesiThe Marches, Italy
    751.5×
  132. 132KroměřížZlín, Czechia
    741.4×
  133. 132AricaArica y Parinacota Region, Chile
    741.4×
  134. 134Hradec KrálovéHradec Králové Region, Czechia
    741.4×
  135. 135KošiceKošice Region, Slovakia
    741.4×
  136. 136RadomMazovia, Poland
    741.4×
  137. 136IzegemFlanders, Belgium
    741.4×
  138. 138ŁódźŁódź Voivodeship, Poland
    741.4×
  139. 138QuinteroValparaiso, Chile
    741.4×
  140. 140MiskolcBorsod-Abaúj-Zemplén, Hungary
    731.4×
  141. 140KrapkowiceOpole Voivodeship, Poland
    731.4×
  142. 142GuangzhouGuangdong, China
    731.4×
  143. 142WolfsbergCarinthia, Austria
    731.4×
  144. 142WaregemFlanders, Belgium
    731.4×
  145. 145WillebroekFlanders, Belgium
    731.4×
  146. 145MartinŽilina Region, Slovakia
    731.4×
  147. 145OpavaMoravian-Silesian Region, Czechia
    731.4×
  148. 145RoveretoTrentino-Alto Adige, Italy
    731.4×
  149. 149OtwockMazovia, Poland
    731.4×
  150. 149ZvolenBanská Bystrica Region, Slovakia
    731.4×
  151. 149ŽilinaŽilina Region, Slovakia
    731.4×
  152. 149BrnoSouth Moravian, Czechia
    731.4×
  153. 153PrešovPrešov Region, Slovakia
    731.4×
  154. 154Kampalalow-cost sensorsCentral Region, Uganda
    721.4×
  155. 154MalmöSkåne, Sweden
    721.4×
  156. 154MaldegemFlanders, Belgium
    721.4×
  157. 154Puente AltoSantiago Metropolitan, Chile
    721.4×
  158. 154Villa Poeta José Gálvez BarrenecheaLima region, Peru
    721.4×
  159. 159SliemaTas-Sliema, Malta
    721.4×
  160. 159WrocławLower Silesia, Poland
    721.4×
  161. 159GotōNagasaki, Japan
    721.4×
  162. 162KolkataWest Bengal, India
    721.3×
  163. 162ObitaNagasaki, Japan
    721.3×
  164. 162Banja LukaSrpska, Bosnia and Herzegovina
    721.3×
  165. 165OytenLower Saxony, Germany
    711.3×
  166. 165ZlínZlín, Czechia
    711.3×
  167. 165Frýdek-MístekMoravian-Silesian Region, Czechia
    711.3×
  168. 165OpoleOpole Voivodeship, Poland
    711.3×
  169. 169KaunasKaunas, Lithuania
    711.3×
  170. 169BamakoBamako, Mali
    711.3×
  171. 169RancaguaO'Higgins Region, Chile
    711.3×
  172. 169CopiapóAtacama, Chile
    711.3×
  173. 173ChennaiTamil Nadu, India
    711.3×
  174. 174SaikaiNagasaki, Japan
    711.3×
  175. 175RzeszówSubcarpathia, Poland
    711.3×
  176. 175HyderabadTelangana, India
    711.3×
  177. 175ŌmuraNagasaki, Japan
    711.3×
  178. 178TogitsuNagasaki, Japan
    711.3×
  179. 178DelmenhorstLower Saxony, Germany
    711.3×
  180. 178Mladá BoleslavCentral Bohemia, Czechia
    711.3×
  181. 181KłodzkoLower Silesia, Poland
    701.3×
  182. 182OlsztynWarmia-Masuria, Poland
    701.3×
  183. 182SaseboNagasaki, Japan
    701.3×
  184. 182SzczecinWest Pomerania, Poland
    701.3×
  185. 182QuillotaValparaiso, Chile
    701.3×
  186. 186Valašské MeziříčíZlín, Czechia
    701.3×
  187. 186Ústí nad LabemÚstí nad Labem Region, Czechia
    701.3×
  188. 188WawerMazovia, Poland
    701.3×
  189. 189Konstancin-JeziornaMazovia, Poland
    701.3×
  190. 189RužomberokŽilina Region, Slovakia
    701.3×
  191. 191JakartaJakarta, Indonesia
    691.3×
  192. 191BerounCentral Bohemia, Czechia
    691.3×
  193. 191CuricóMaule Region, Chile
    691.3×
  194. 194San Francisco De BorjaLima region, Peru
    691.3×
  195. 195La SerenaCoquimbo Region, Chile
    691.3×
  196. 195ZapopanJalisco, Mexico
    691.3×
  197. 197Žiar nad HronomBanská Bystrica Region, Slovakia
    691.2×
  198. 198BakuBaki, Azerbaijan
    691.2×
  199. 198Czechowice-DziedziceSilesia, Poland
    691.2×
  200. 198ValdiviaLos Ríos Region, Chile
    691.2×

Top 200 of 1,883 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

Use this board

SmogRank, most polluted cities, PM2.5, September 12, 2023, smogrank.com/history/2023-09-12 (accessed 2 Oct 2026).

Download top 10 (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.