SmogRank / History / August 26, 2023

Most polluted cities on August 26, 2023

1,379 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 August 26, 2023. All episodes.

← Piedras Negras 986.0 µg/m³ 900 µg/m³15 WHO 24-hour guideline
Every city ranked for August 26, 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. 2OsornoLos Lagos Region, Chile
    29214.5×
  3. 3Puerto VarasLos Lagos Region, Chile
    25411.9×
  4. 4NacimientoBiobio, Chile
    1968.0×
  5. 5Grants PassOregon, United States
    1917.5×
  6. 6RoseburgOregon, United States
    1846.9×
  7. 7La UniónLos Ríos Region, Chile
    1766.1×
  8. 8MedfordOregon, United States
    1725.7×
  9. 9Fort McMurrayAlberta, Canada
    1695.4×
  10. 10Los ÁngelesBiobio, Chile
    1685.3×
  11. 11TemucoAraucania, Chile
    1645.0×
  12. 12AshlandOregon, United States
    1624.8×
  13. 13CuranilahueBiobio, Chile
    1594.4×
  14. 14ValdiviaLos Ríos Region, Chile
    1523.8×
  15. 15Puerto AysénAysén, Chile
    1513.7×
  16. 16ChillánÑuble, Chile
    1513.7×
  17. 17AlexandriaAlexandria, Egypt
    1493.7×
  18. 18Puerto MonttLos Lagos Region, Chile
    1443.5×
  19. 19San CarlosÑuble, Chile
    1393.4×
  20. 20TalcahuanoBiobio, Chile
    1383.4×
  21. 21ToméBiobio, Chile
    1222.9×
  22. 22Fort St. JohnBritish Columbia, Canada
    1212.9×
  23. 23Lahorelow-cost sensorsPunjab, Pakistan
    1202.9×
  24. 24HualquiBiobio, Chile
    1172.8×
  25. 25DushanbeDushanbe, Tajikistan
    1152.7×
  26. 26TalaganteSantiago Metropolitan, Chile
    1122.7×
  27. 26SantiagoSantiago Metropolitan, Chile
    1122.7×
  28. 28Kampalalow-cost sensorsCentral Region, Uganda
    1122.7×
  29. 29Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1122.7×
  30. 30Dhakalow-cost sensorsDhaka Division, Bangladesh
    1112.6×
  31. 31KigaliKigali, Rwanda
    1112.6×
  32. 32Grande PrairieAlberta, Canada
    1092.6×
  33. 33ChilliwackBritish Columbia, Canada
    1082.6×
  34. 34DelhiDelhi, India
    1062.5×
  35. 35CoronelBiobio, Chile
    1062.5×
  36. 36AbbotsfordBritish Columbia, Canada
    1052.5×
  37. 37Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1042.5×
  38. 37TerraceBritish Columbia, Canada
    1042.5×
  39. 39Strawberry HillBritish Columbia, Canada
    1042.4×
  40. 40PristinaPristina, Kosovo
    1032.4×
  41. 40SquamishBritish Columbia, Canada
    1032.4×
  42. 42TalcaMaule Region, Chile
    992.3×
  43. 43KolkataWest Bengal, India
    982.3×
  44. 43CoyhaiqueAysén, Chile
    982.3×
  45. 45EugeneOregon, United States
    982.3×
  46. 46SeattleWashington, United States
    972.3×
  47. 47Columbia CityWashington, United States
    972.2×
  48. 48RentonWashington, United States
    962.2×
  49. 48West VancouverBritish Columbia, Canada
    962.2×
  50. 50MexicaliBaja California, Mexico
    962.2×
  51. 51San Salvador TizatlalliMéxico, Mexico
    952.2×
  52. 52Santa Anita - Los FicusLima region, Peru
    952.2×
  53. 53VictoriaBritish Columbia, Canada
    952.2×
  54. 54CauquenesMaule Region, Chile
    942.2×
  55. 55ShorelineWashington, United States
    942.1×
  56. 56TacomaWashington, United States
    932.1×
  57. 56San Pedro de la PazBiobio, Chile
    932.1×
  58. 58XonacatlánMéxico, Mexico
    932.1×
  59. 59RancaguaO'Higgins Region, Chile
    932.1×
  60. 59KelownaBritish Columbia, Canada
    932.1×
  61. 61ConcepciónBiobio, Chile
    922.1×
  62. 62BellinghamWashington, United States
    922.1×
  63. 63KamloopsBritish Columbia, Canada
    912.0×
  64. 64BremertonWashington, United States
    902.0×
  65. 64VancouverBritish Columbia, Canada
    902.0×
  66. 66IssaquahWashington, United States
    902.0×
  67. 67CourtenayBritish Columbia, Canada
    902.0×
  68. 68TolucaMéxico, Mexico
    892.0×
  69. 68BirminghamAlabama, United States
    892.0×
  70. 68LangfordBritish Columbia, Canada
    892.0×
  71. 71CoquitlamBritish Columbia, Canada
    892.0×
  72. 72RengoO'Higgins Region, Chile
    881.9×
  73. 72ParklandWashington, United States
    881.9×
  74. 74SarajevoFederation of B&H, Bosnia and Herzegovina
    881.9×
  75. 75LangleyBritish Columbia, Canada
    881.9×
  76. 76LimaLima Province, Peru
    871.9×
  77. 77Puente AltoSantiago Metropolitan, Chile
    861.9×
  78. 78Port AngelesWashington, United States
    861.9×
  79. 78PentictonBritish Columbia, Canada
    861.9×
  80. 80AuburnWashington, United States
    861.9×
  81. 81CopiapóAtacama, Chile
    861.9×
  82. 81TlaquepaqueJalisco, Mexico
    861.9×
  83. 83Islamabadlow-cost sensorsIslamabad, Pakistan
    851.8×
  84. 83Samut SakhonSamut Sakhon, Thailand
    851.8×
  85. 85San Francisco TlalcilalcalpanMéxico, Mexico
    851.8×
  86. 85DeltaBritish Columbia, Canada
    851.8×
  87. 87BurnabyBritish Columbia, Canada
    841.8×
  88. 87North VancouverBritish Columbia, Canada
    841.8×
  89. 89VernonBritish Columbia, Canada
    841.8×
  90. 90HanoiHanoi, Vietnam
    841.8×
  91. 91QuillotaValparaiso, Chile
    831.8×
  92. 92GuangzhouGuangdong, China
    821.7×
  93. 93ChiguayanteBiobio, Chile
    821.7×
  94. 94HarewoodBritish Columbia, Canada
    821.7×
  95. 95Campbell RiverBritish Columbia, Canada
    821.7×
  96. 95EdmontonAlberta, Canada
    821.7×
  97. 97PécsBaranya, Hungary
    811.7×
  98. 97CuricóMaule Region, Chile
    811.7×
  99. 99ChennaiTamil Nadu, India
    811.7×
  100. 100AlbanyOregon, United States
    801.7×
  101. 101Port CoquitlamBritish Columbia, Canada
    801.6×
  102. 102Port AlberniBritish Columbia, Canada
    801.6×
  103. 103DuncanBritish Columbia, Canada
    801.6×
  104. 104Naucalpan de JuárezMéxico, Mexico
    791.6×
  105. 104RichmondBritish Columbia, Canada
    791.6×
  106. 106Victoria de DurangoDurango, Mexico
    791.6×
  107. 106Little RockArkansas, United States
    791.6×
  108. 106BellevueWashington, United States
    791.6×
  109. 109AlgiersAlgiers, Algeria
    781.6×
  110. 110HattiesburgMississippi, United States
    781.6×
  111. 111AntofagastaAntofagasta, Chile
    771.5×
  112. 111TigardOregon, United States
    771.5×
  113. 113NanaimoBritish Columbia, Canada
    761.5×
  114. 114CoquimboCoquimbo Region, Chile
    761.5×
  115. 114Villa Poeta José Gálvez BarrenecheaLima region, Peru
    761.5×
  116. 116Mount VernonWashington, United States
    761.5×
  117. 117JacksonMississippi, United States
    761.5×
  118. 118RichmondCalifornia, United States
    751.5×
  119. 119Ciudad NezahualcoyotlMéxico, Mexico
    751.5×
  120. 119HernandoMississippi, United States
    751.5×
  121. 121ShreveportLouisiana, United States
    751.5×
  122. 122Ferry PassFlorida, United States
    751.5×
  123. 123CuernavacaMorelos, Mexico
    741.4×
  124. 124TexarkanaTexas, United States
    741.4×
  125. 124North CowichanBritish Columbia, Canada
    741.4×
  126. 126N'DjamenaN’Djaména, Chad
    741.4×
  127. 127CanbyOregon, United States
    741.4×
  128. 128Karachilow-cost sensorsSindh, Pakistan
    731.4×
  129. 128GulfportMississippi, United States
    731.4×
  130. 128AnacortesWashington, United States
    731.4×
  131. 131Nong KhaemBangkok, Thailand
    731.4×
  132. 132MidwayFlorida, United States
    731.4×
  133. 133PueblaPuebla, Mexico
    731.4×
  134. 134Mexico CityMexico City, Mexico
    721.4×
  135. 135JeddahMecca Region, Saudi Arabia
    721.4×
  136. 136Alto HospicioTarapacá, Chile
    721.4×
  137. 137Wan ChaiWan Chai, Hong Kong
    721.3×
  138. 137DallasTexas, United States
    721.3×
  139. 139TijuanaBaja California, Mexico
    711.3×
  140. 140Ciudad JuárezChihuahua, Mexico
    711.3×
  141. 140Salmon CreekWashington, United States
    711.3×
  142. 142BamakoBamako, Mali
    711.3×
  143. 142ConcónValparaiso, Chile
    711.3×
  144. 142HermistonOregon, United States
    711.3×
  145. 145La SerenaCoquimbo Region, Chile
    711.3×
  146. 145SalemOregon, United States
    711.3×
  147. 147San Francisco De BorjaLima region, Peru
    711.3×
  148. 148PascagoulaMississippi, United States
    711.3×
  149. 149EdmondOklahoma, United States
    701.3×
  150. 150Addis AbabaAddis Ababa, Ethiopia
    701.3×
  151. 150BendOregon, United States
    701.3×
  152. 152Oklahoma CityOklahoma, United States
    691.3×
  153. 153SaltilloCoahuila, Mexico
    691.2×
  154. 154ColumbusGeorgia, United States
    681.2×
  155. 155NyíregyházaSzabolcs-Szatmár-Bereg, Hungary
    681.2×
  156. 155HillsboroOregon, United States
    681.2×
  157. 157QuinteroValparaiso, Chile
    681.2×
  158. 158BeavertonOregon, United States
    681.2×
  159. 159MiskolcBorsod-Abaúj-Zemplén, Hungary
    671.2×
  160. 159MooreOklahoma, United States
    671.2×
  161. 159ReginaSaskatchewan, Canada
    671.2×
  162. 162TocopillaAntofagasta, Chile
    671.2×
  163. 163New OrleansLouisiana, United States
    671.2×
  164. 164Viña del MarValparaiso, Chile
    671.2×
  165. 165BangkokBangkok, Thailand
    661.2×
  166. 166NairobiNairobi County, Kenya
    661.2×
  167. 166MaconGeorgia, United States
    661.2×
  168. 166Baton RougeLouisiana, United States
    661.2×
  169. 169LotaBiobio, Chile
    661.1×
  170. 169Santa CatarinaNuevo León, Mexico
    661.1×
  171. 169CorvallisOregon, United States
    661.1×
  172. 172East RidgeTennessee, United States
    661.1×
  173. 173PortlandOregon, United States
    661.1×
  174. 173SpokaneWashington, United States
    661.1×
  175. 175SpartanburgSouth Carolina, United States
    661.1×
  176. 175PendletonOregon, United States
    661.1×
  177. 175CalgaryAlberta, Canada
    661.1×
  178. 178GadsdenAlabama, United States
    651.1×
  179. 178DentonTexas, United States
    651.1×
  180. 180FairhopeAlabama, United States
    651.1×
  181. 180TrussvilleAlabama, United States
    651.1×
  182. 182AdaOklahoma, United States
    651.1×
  183. 182SalinasCalifornia, United States
    651.1×
  184. 182Forest GroveOregon, United States
    651.1×
  185. 182LaceyWashington, United States
    651.1×
  186. 186BakuBaki, Azerbaijan
    651.1×
  187. 186Fort WorthTexas, United States
    651.1×
  188. 188Phenix CityAlabama, United States
    651.1×
  189. 188CentraliaWashington, United States
    651.1×
  190. 188Walla WallaWashington, United States
    651.1×
  191. 191AntananarivoAnalamanga, Madagascar
    641.1×
  192. 192Botevgradlow-cost sensorsSofia, Bulgaria
    641.1×
  193. 192NagaiYamagata, Japan
    641.1×
  194. 192Redwood CityCalifornia, United States
    641.1×
  195. 192Prince AlbertSaskatchewan, Canada
    641.1×
  196. 196PrichardAlabama, United States
    641.1×
  197. 197BeijingBeijing, China
    641.1×
  198. 197Ang Mo Kio New TownSingapore
    641.1×
  199. 197JacksonTennessee, United States
    641.1×
  200. 197San JoseCalifornia, United States
    641.1×

Top 200 of 1,379 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, August 26, 2023, smogrank.com/history/2023-08-26 (accessed 2 Oct 2026).

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