SmogRank / History / September 9, 2023

Most polluted cities on September 9, 2023

1,904 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 9, 2023. All episodes.

← Piedras Negras 986.0 µg/m³ 900 µg/m³15 WHO 24-hour guideline
Every city ranked for September 9, 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. 2CoyhaiqueAysén, Chile
    1645.0×
  3. 3Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1624.7×
  4. 4Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1574.3×
  5. 5AlexandriaAlexandria, Egypt
    1523.8×
  6. 6Lahorelow-cost sensorsPunjab, Pakistan
    1453.6×
  7. 7Addis AbabaAddis Ababa, Ethiopia
    1423.5×
  8. 8JakartaJakarta, Indonesia
    1383.4×
  9. 9NairobiNairobi County, Kenya
    1343.3×
  10. 10DunkirkHauts-de-France, France
    1333.2×
  11. 11ZwijndrechtFlanders, Belgium
    1212.9×
  12. 12KadaňÚstí nad Labem Region, Czechia
    1212.9×
  13. 13Shakaskraallow-cost sensorsKwaZulu-Natal, South Africa
    1172.8×
  14. 14KigaliKigali, Rwanda
    1152.7×
  15. 14Dhakalow-cost sensorsDhaka Division, Bangladesh
    1152.7×
  16. 16AntwerpFlanders, Belgium
    1132.7×
  17. 17RancaguaO'Higgins Region, Chile
    1092.6×
  18. 18Puente AltoSantiago Metropolitan, Chile
    1052.5×
  19. 19DushanbeDushanbe, Tajikistan
    1042.4×
  20. 20BeverenFlanders, Belgium
    1032.4×
  21. 20SantiagoSantiago Metropolitan, Chile
    1032.4×
  22. 22JeddahMecca Region, Saudi Arabia
    1022.4×
  23. 23RoeselareFlanders, Belgium
    1002.3×
  24. 24NacimientoBiobio, Chile
    992.3×
  25. 25KoksijdeFlanders, Belgium
    992.3×
  26. 25AarschotFlanders, Belgium
    992.3×
  27. 27Quezon Citylow-cost sensorsNational Capital Region, Philippines
    992.3×
  28. 28EvergemFlanders, Belgium
    962.2×
  29. 29MexicaliBaja California, Mexico
    962.2×
  30. 30DębicaSubcarpathia, Poland
    962.2×
  31. 31NottinghamEngland, United Kingdom
    962.2×
  32. 32Puerto AysénAysén, Chile
    952.2×
  33. 33CuranilahueBiobio, Chile
    942.1×
  34. 34TlaquepaqueJalisco, Mexico
    932.1×
  35. 35MaldegemFlanders, Belgium
    932.1×
  36. 36WillebroekFlanders, Belgium
    932.1×
  37. 37LochristiFlanders, Belgium
    922.1×
  38. 38RengoO'Higgins Region, Chile
    912.1×
  39. 39SpekeEngland, United Kingdom
    912.0×
  40. 40HanoiHanoi, Vietnam
    912.0×
  41. 40IzegemFlanders, Belgium
    912.0×
  42. 42Victoria de DurangoDurango, Mexico
    912.0×
  43. 43CuricóMaule Region, Chile
    902.0×
  44. 44NorwichEngland, United Kingdom
    902.0×
  45. 44LinaresMaule Region, Chile
    902.0×
  46. 46OsornoLos Lagos Region, Chile
    902.0×
  47. 47Manchesterlow-cost sensorsEngland, United Kingdom
    892.0×
  48. 48MielecSubcarpathia, Poland
    881.9×
  49. 49GrimbergenFlanders, Belgium
    881.9×
  50. 50Clacton-on-SeaEngland, United Kingdom
    881.9×
  51. 51KrakówLesser Poland, Poland
    881.9×
  52. 51ChillánÑuble, Chile
    881.9×
  53. 53Stoke-on-TrentEngland, United Kingdom
    881.9×
  54. 54ShenyangLiaoning, China
    871.9×
  55. 54La UniónLos Ríos Region, Chile
    871.9×
  56. 56LeedsEngland, United Kingdom
    871.9×
  57. 57KatowiceSilesia, Poland
    861.9×
  58. 57QuillotaValparaiso, Chile
    861.9×
  59. 59BremerhavenBremen, Germany
    851.8×
  60. 59AnconaThe Marches, Italy
    851.8×
  61. 61PristinaPristina, Kosovo
    841.8×
  62. 61BrusselsBrussels Capital, Belgium
    841.8×
  63. 63RoubaixHauts-de-France, France
    841.8×
  64. 63Jastrzębie ZdrójSilesia, Poland
    841.8×
  65. 65KapellenFlanders, Belgium
    841.8×
  66. 66Santa Anita - Los FicusLima region, Peru
    841.8×
  67. 67LiverpoolEngland, United Kingdom
    831.8×
  68. 68AntananarivoAnalamanga, Madagascar
    831.8×
  69. 68CopiapóAtacama, Chile
    831.8×
  70. 70PortlandMaine, United States
    831.8×
  71. 71Birminghamlow-cost sensorsEngland, United Kingdom
    821.7×
  72. 72GentFlanders, Belgium
    821.7×
  73. 73Fort McMurrayAlberta, Canada
    821.7×
  74. 74BydgoszczKujawsko-Pomorskie, Poland
    821.7×
  75. 74Grande PrairieAlberta, Canada
    821.7×
  76. 76LublinLublin, Poland
    811.7×
  77. 77PruszkówMazovia, Poland
    811.7×
  78. 78PrestonEngland, United Kingdom
    811.7×
  79. 78XonacatlánMéxico, Mexico
    811.7×
  80. 80WaregemFlanders, Belgium
    811.7×
  81. 80MenenFlanders, Belgium
    811.7×
  82. 80TalaganteSantiago Metropolitan, Chile
    811.7×
  83. 83LilleHauts-de-France, France
    801.7×
  84. 84LegionowoMazovia, Poland
    801.6×
  85. 84MiddlesbroughEngland, United Kingdom
    801.6×
  86. 84MolFlanders, Belgium
    801.6×
  87. 84KirishimaKagoshima, Japan
    801.6×
  88. 88CardiffWales, United Kingdom
    801.6×
  89. 89RacibórzSilesia, Poland
    801.6×
  90. 90RzeszówSubcarpathia, Poland
    791.6×
  91. 91NiskoSubcarpathia, Poland
    791.6×
  92. 91OstravaMoravian-Silesian Region, Czechia
    791.6×
  93. 91Los ÁngelesBiobio, Chile
    791.6×
  94. 94KrosnoSubcarpathia, Poland
    791.6×
  95. 95LimaLima Province, Peru
    781.6×
  96. 96WarsawMazovia, Poland
    781.6×
  97. 96MiyakonojōMiyazaki, Japan
    781.6×
  98. 96TournaiWallonia, Belgium
    781.6×
  99. 96AntofagastaAntofagasta, Chile
    781.6×
  100. 100KortrijkFlanders, Belgium
    781.6×
  101. 100TemucoAraucania, Chile
    781.6×
  102. 102Newcastle upon TyneEngland, United Kingdom
    781.6×
  103. 102Canvey IslandEngland, United Kingdom
    781.6×
  104. 104BelfastNorthern Ireland, United Kingdom
    781.6×
  105. 104BrestBrittany, France
    781.6×
  106. 106ToruńKujawsko-Pomorskie, Poland
    771.6×
  107. 107MinamataKumamoto, Japan
    771.5×
  108. 108BakuBaki, Azerbaijan
    771.5×
  109. 109Briton FerryWales, United Kingdom
    771.5×
  110. 110KaliszGreater Poland, Poland
    771.5×
  111. 111IrlamEngland, United Kingdom
    761.5×
  112. 111Le HavreNormandy, France
    761.5×
  113. 111SarajevoFederation of B&H, Bosnia and Herzegovina
    761.5×
  114. 114BeijingBeijing, China
    761.5×
  115. 115TarnówLesser Poland, Poland
    761.5×
  116. 115Kędzierzyn-KoźleOpole Voivodeship, Poland
    761.5×
  117. 115Puerto MonttLos Lagos Region, Chile
    761.5×
  118. 115MinamikyushuKagoshima, Japan
    761.5×
  119. 119HualquiBiobio, Chile
    761.5×
  120. 120KielceŚwiętokrzyskie, Poland
    751.5×
  121. 120SliemaTas-Sliema, Malta
    751.5×
  122. 120Kingston upon HullEngland, United Kingdom
    751.5×
  123. 120DieppeNormandy, France
    751.5×
  124. 124KagoshimaKagoshima, Japan
    751.5×
  125. 124TalcaMaule Region, Chile
    751.5×
  126. 126Czechowice-DziedziceSilesia, Poland
    751.5×
  127. 127HavířovMoravian-Silesian Region, Czechia
    751.5×
  128. 128ŁaskŁódź Voivodeship, Poland
    741.4×
  129. 128NaplesCampania, Italy
    741.4×
  130. 130CaenNormandy, France
    741.4×
  131. 131AugsburgBavaria, Germany
    741.4×
  132. 131TalcahuanoBiobio, Chile
    741.4×
  133. 131Silao de la VictoriaGuanajuato, Mexico
    741.4×
  134. 134GuangzhouGuangdong, China
    741.4×
  135. 134BamakoBamako, Mali
    741.4×
  136. 134DěčínÚstí nad Labem Region, Czechia
    741.4×
  137. 134RadomskoŁódź Voivodeship, Poland
    741.4×
  138. 134KościanGreater Poland, Poland
    741.4×
  139. 134TocopillaAntofagasta, Chile
    741.4×
  140. 134ZapopanJalisco, Mexico
    741.4×
  141. 141YorkEngland, United Kingdom
    741.4×
  142. 142PlymouthEngland, United Kingdom
    731.4×
  143. 142MunichBavaria, Germany
    731.4×
  144. 142ŚwinoujścieWest Pomerania, Poland
    731.4×
  145. 145ChennaiTamil Nadu, India
    731.4×
  146. 145La SerenaCoquimbo Region, Chile
    731.4×
  147. 145EdmontonAlberta, Canada
    731.4×
  148. 148ŁukówLublin, Poland
    731.4×
  149. 148BohumínMoravian-Silesian Region, Czechia
    731.4×
  150. 148Lexingtonlow-cost sensorsMassachusetts, United States
    731.4×
  151. 151PoznańGreater Poland, Poland
    731.4×
  152. 151BirminghamAlabama, United States
    731.4×
  153. 153LondonEngland, United Kingdom
    731.4×
  154. 153Český TěšínMoravian-Silesian Region, Czechia
    731.4×
  155. 153QuinteroValparaiso, Chile
    731.4×
  156. 156DelmenhorstLower Saxony, Germany
    721.4×
  157. 156MiędzyrzeczLubusz, Poland
    721.4×
  158. 156San CarlosÑuble, Chile
    721.4×
  159. 156Sioux FallsSouth Dakota, United States
    721.4×
  160. 160Puerto VarasLos Lagos Region, Chile
    721.4×
  161. 160ConcónValparaiso, Chile
    721.4×
  162. 162San Salvador TizatlalliMéxico, Mexico
    721.4×
  163. 163ŻyrardówMazovia, Poland
    721.4×
  164. 163LorientBrittany, France
    721.4×
  165. 163Gorzów WielkopolskiLubusz, Poland
    721.4×
  166. 166OpoleOpole Voivodeship, Poland
    721.3×
  167. 166Falconara MarittimaThe Marches, Italy
    721.3×
  168. 168PascagoulaMississippi, United States
    711.3×
  169. 169LotaBiobio, Chile
    711.3×
  170. 169SulphurLouisiana, United States
    711.3×
  171. 171StarachowiceŚwiętokrzyskie, Poland
    711.3×
  172. 171ChesterfieldEngland, United Kingdom
    711.3×
  173. 173Kaseda-shirakameKagoshima, Japan
    711.3×
  174. 173CoronelBiobio, Chile
    711.3×
  175. 173MidwayFlorida, United States
    711.3×
  176. 176SaltashEngland, United Kingdom
    701.3×
  177. 176LęborkPomerania, Poland
    701.3×
  178. 178ValenciennesHauts-de-France, France
    701.3×
  179. 179RadomMazovia, Poland
    701.3×
  180. 179Viña del MarValparaiso, Chile
    701.3×
  181. 179Baton RougeLouisiana, United States
    701.3×
  182. 182LindauBavaria, Germany
    701.3×
  183. 182AlessandriaPiedmont, Italy
    701.3×
  184. 182Villa Poeta José Gálvez BarrenecheaLima region, Peru
    701.3×
  185. 182JenksOklahoma, United States
    701.3×
  186. 186Neu-UlmBavaria, Germany
    691.3×
  187. 186PłockMazovia, Poland
    691.3×
  188. 186AricaArica y Parinacota Region, Chile
    691.3×
  189. 189WłocławekKujawsko-Pomorskie, Poland
    691.3×
  190. 189JesiThe Marches, Italy
    691.3×
  191. 189GulfportMississippi, United States
    691.3×
  192. 189HattiesburgMississippi, United States
    691.3×
  193. 193WarringtonEngland, United Kingdom
    691.3×
  194. 194WrocławLower Silesia, Poland
    691.2×
  195. 194West FargoNorth Dakota, United States
    691.2×
  196. 196BitolaBitola, North Macedonia
    691.2×
  197. 196TolucaMéxico, Mexico
    691.2×
  198. 196ShreveportLouisiana, United States
    691.2×
  199. 196BrookingsSouth Dakota, United States
    691.2×
  200. 200OldenburgLower Saxony, Germany
    681.2×

Top 200 of 1,904 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 9, 2023, smogrank.com/history/2023-09-09 (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.