SmogRank / History / August 25, 2023

Most polluted cities on August 25, 2023

1,393 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 25, 2023. All episodes.

← Piedras Negras 986.0 µg/m³ 900 µg/m³15 WHO 24-hour guideline
Every city ranked for August 25, 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. 2Grants PassOregon, United States
    25011.7×
  3. 3Puerto VarasLos Lagos Region, Chile
    24211.1×
  4. 4OsornoLos Lagos Region, Chile
    2209.7×
  5. 5AshlandOregon, United States
    2179.4×
  6. 6MedfordOregon, United States
    2139.2×
  7. 7La UniónLos Ríos Region, Chile
    1705.5×
  8. 8EdmontonAlberta, Canada
    1685.3×
  9. 9RoseburgOregon, United States
    1655.0×
  10. 10NacimientoBiobio, Chile
    1634.9×
  11. 11ManamaManama, Bahrain
    1574.3×
  12. 12TalcaMaule Region, Chile
    1564.2×
  13. 13Puerto MonttLos Lagos Region, Chile
    1554.1×
  14. 14EugeneOregon, United States
    1533.9×
  15. 15Los ÁngelesBiobio, Chile
    1513.7×
  16. 16ChillánÑuble, Chile
    1453.6×
  17. 17ValdiviaLos Ríos Region, Chile
    1443.5×
  18. 18Dhakalow-cost sensorsDhaka Division, Bangladesh
    1443.5×
  19. 19Fort McMurrayAlberta, Canada
    1433.5×
  20. 20San CarlosÑuble, Chile
    1403.4×
  21. 21TalcahuanoBiobio, Chile
    1393.4×
  22. 22Kampalalow-cost sensorsCentral Region, Uganda
    1373.4×
  23. 23St. AlbertAlberta, Canada
    1373.3×
  24. 24ChilliwackBritish Columbia, Canada
    1363.3×
  25. 25AlexandriaAlexandria, Egypt
    1353.3×
  26. 26DushanbeDushanbe, Tajikistan
    1263.0×
  27. 27Fort St. JohnBritish Columbia, Canada
    1253.0×
  28. 28KigaliKigali, Rwanda
    1243.0×
  29. 29Sherwood ParkAlberta, Canada
    1233.0×
  30. 30Grande PrairieAlberta, Canada
    1222.9×
  31. 31TemucoAraucania, Chile
    1172.8×
  32. 32CoyhaiqueAysén, Chile
    1172.8×
  33. 33CuranilahueBiobio, Chile
    1172.8×
  34. 34AltamontOregon, United States
    1132.7×
  35. 35Shakaskraallow-cost sensorsKwaZulu-Natal, South Africa
    1112.6×
  36. 36SquamishBritish Columbia, Canada
    1092.6×
  37. 37HanoiHanoi, Vietnam
    1082.6×
  38. 38CauquenesMaule Region, Chile
    1062.5×
  39. 39Lahorelow-cost sensorsPunjab, Pakistan
    1052.5×
  40. 40BurnabyBritish Columbia, Canada
    1052.5×
  41. 41Puerto AysénAysén, Chile
    1042.5×
  42. 41AbbotsfordBritish Columbia, Canada
    1042.5×
  43. 43PristinaPristina, Kosovo
    1032.4×
  44. 44CoquitlamBritish Columbia, Canada
    1022.4×
  45. 44LangleyBritish Columbia, Canada
    1022.4×
  46. 46North VancouverBritish Columbia, Canada
    992.3×
  47. 47HualquiBiobio, Chile
    992.3×
  48. 48JakartaJakarta, Indonesia
    992.3×
  49. 49BamakoBamako, Mali
    992.3×
  50. 49ToméBiobio, Chile
    992.3×
  51. 51ShreveportLouisiana, United States
    982.3×
  52. 51Santa Anita - Los FicusLima region, Peru
    982.3×
  53. 53MexicaliBaja California, Mexico
    982.3×
  54. 54SarajevoFederation of B&H, Bosnia and Herzegovina
    972.3×
  55. 55Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    972.3×
  56. 56CoronelBiobio, Chile
    952.2×
  57. 57LimaLima Province, Peru
    952.2×
  58. 58Port CoquitlamBritish Columbia, Canada
    942.1×
  59. 59TlaquepaqueJalisco, Mexico
    932.1×
  60. 60KamloopsBritish Columbia, Canada
    932.1×
  61. 60PentictonBritish Columbia, Canada
    932.1×
  62. 62Samut SakhonSamut Sakhon, Thailand
    932.1×
  63. 62Strawberry HillBritish Columbia, Canada
    932.1×
  64. 64LinaresMaule Region, Chile
    922.1×
  65. 65Villa Poeta José Gálvez BarrenecheaLima region, Peru
    902.0×
  66. 66AlbanyOregon, United States
    902.0×
  67. 66Rapid CitySouth Dakota, United States
    902.0×
  68. 68CuricóMaule Region, Chile
    892.0×
  69. 69Şabāḩ as SālimMubārak al Kabīr, Kuwait
    892.0×
  70. 69BirminghamAlabama, United States
    892.0×
  71. 71West VancouverBritish Columbia, Canada
    871.9×
  72. 72TocopillaAntofagasta, Chile
    871.9×
  73. 73NairobiNairobi County, Kenya
    861.9×
  74. 74DelhiDelhi, India
    861.9×
  75. 75ChennaiTamil Nadu, India
    851.8×
  76. 76ConcepciónBiobio, Chile
    841.8×
  77. 77KolkataWest Bengal, India
    841.8×
  78. 78VernonBritish Columbia, Canada
    841.8×
  79. 79BellinghamWashington, United States
    821.7×
  80. 79Red DeerAlberta, Canada
    821.7×
  81. 81LewistonIdaho, United States
    821.7×
  82. 82SantiagoSantiago Metropolitan, Chile
    821.7×
  83. 83Victoria de DurangoDurango, Mexico
    811.7×
  84. 83LangfordBritish Columbia, Canada
    811.7×
  85. 85Abujalow-cost sensorsFCT, Nigeria
    801.7×
  86. 86TexarkanaTexas, United States
    801.7×
  87. 87Addis AbabaAddis Ababa, Ethiopia
    801.6×
  88. 88Little RockArkansas, United States
    801.6×
  89. 89TalaganteSantiago Metropolitan, Chile
    791.6×
  90. 90JeddahMecca Region, Saudi Arabia
    781.6×
  91. 91LibertyMissouri, United States
    781.6×
  92. 91San Pedro de la PazBiobio, Chile
    781.6×
  93. 93KelownaBritish Columbia, Canada
    771.6×
  94. 94XonacatlánMéxico, Mexico
    771.5×
  95. 95Port AngelesWashington, United States
    771.5×
  96. 96Islamabadlow-cost sensorsIslamabad, Pakistan
    761.5×
  97. 96RancaguaO'Higgins Region, Chile
    761.5×
  98. 96DallasTexas, United States
    761.5×
  99. 96DuncanBritish Columbia, Canada
    761.5×
  100. 100CourtenayBritish Columbia, Canada
    761.5×
  101. 101San Francisco TlalcilalcalpanMéxico, Mexico
    761.5×
  102. 101CorvallisOregon, United States
    761.5×
  103. 103HernandoMississippi, United States
    761.5×
  104. 103JacksonMississippi, United States
    761.5×
  105. 103Port AlberniBritish Columbia, Canada
    761.5×
  106. 106VictoriaBritish Columbia, Canada
    751.5×
  107. 107Salmon CreekWashington, United States
    751.5×
  108. 108JasperIndiana, United States
    751.5×
  109. 109HueytownAlabama, United States
    741.4×
  110. 109San Francisco De BorjaLima region, Peru
    741.4×
  111. 111QuillotaValparaiso, Chile
    741.4×
  112. 112TerraceBritish Columbia, Canada
    741.4×
  113. 113ChiguayanteBiobio, Chile
    741.4×
  114. 114Wan ChaiWan Chai, Hong Kong
    741.4×
  115. 114TigardOregon, United States
    741.4×
  116. 116SalemOregon, United States
    741.4×
  117. 117Ciudad ApodacaNuevo León, Mexico
    731.4×
  118. 117PullmanWashington, United States
    731.4×
  119. 119N'DjamenaN’Djaména, Chad
    731.4×
  120. 119CopiapóAtacama, Chile
    731.4×
  121. 121RengoO'Higgins Region, Chile
    721.4×
  122. 122EdmondOklahoma, United States
    721.4×
  123. 122MooreOklahoma, United States
    721.4×
  124. 124LouisvilleKentucky, United States
    721.4×
  125. 124Fort WorthTexas, United States
    721.4×
  126. 126Nong KhaemBangkok, Thailand
    721.4×
  127. 126GadsdenAlabama, United States
    721.4×
  128. 126JeffersontownKentucky, United States
    721.4×
  129. 126SeattleWashington, United States
    721.4×
  130. 130CoquimboCoquimbo Region, Chile
    721.3×
  131. 130NorwoodOhio, United States
    721.3×
  132. 130SaginawTexas, United States
    721.3×
  133. 133GuangzhouGuangdong, China
    711.3×
  134. 133EvansvilleIndiana, United States
    711.3×
  135. 135Ciudad JuárezChihuahua, Mexico
    711.3×
  136. 135JenksOklahoma, United States
    711.3×
  137. 135San Salvador TizatlalliMéxico, Mexico
    711.3×
  138. 138NanaimoBritish Columbia, Canada
    711.3×
  139. 139AntofagastaAntofagasta, Chile
    711.3×
  140. 139North CowichanBritish Columbia, Canada
    711.3×
  141. 139RichmondBritish Columbia, Canada
    711.3×
  142. 142SaltilloCoahuila, Mexico
    711.3×
  143. 142Valley StationKentucky, United States
    711.3×
  144. 142HillsboroOregon, United States
    711.3×
  145. 145ColumbusGeorgia, United States
    701.3×
  146. 145DerbyKansas, United States
    701.3×
  147. 145RentonWashington, United States
    701.3×
  148. 145Candler-McAfeeGeorgia, United States
    701.3×
  149. 149CincinnatiOhio, United States
    701.3×
  150. 150Karachilow-cost sensorsSindh, Pakistan
    701.3×
  151. 150MaconGeorgia, United States
    701.3×
  152. 150JeffersonvilleIndiana, United States
    701.3×
  153. 150DyersburgTennessee, United States
    701.3×
  154. 150Prince AlbertSaskatchewan, Canada
    701.3×
  155. 155CholulaPuebla, Mexico
    701.3×
  156. 155ElizabethtownKentucky, United States
    701.3×
  157. 155MoscowIdaho, United States
    701.3×
  158. 155VancouverBritish Columbia, Canada
    701.3×
  159. 159SalorTashkent Region, Uzbekistan
    701.3×
  160. 159SpringdaleArkansas, United States
    701.3×
  161. 159OlatheKansas, United States
    701.3×
  162. 159MiddletownOhio, United States
    701.3×
  163. 163Ciudad Benito JuárezNuevo León, Mexico
    691.3×
  164. 163HattiesburgMississippi, United States
    691.3×
  165. 163East RidgeTennessee, United States
    691.3×
  166. 163Port ArthurTexas, United States
    691.3×
  167. 167Columbia CityWashington, United States
    691.3×
  168. 168AlbanyGeorgia, United States
    691.3×
  169. 168HoustonTexas, United States
    691.3×
  170. 170SpringfieldIllinois, United States
    691.2×
  171. 170TulsaOklahoma, United States
    691.2×
  172. 170IssaquahWashington, United States
    691.2×
  173. 173DeltaBritish Columbia, Canada
    691.2×
  174. 174Ponca CityOklahoma, United States
    691.2×
  175. 174JacksonTennessee, United States
    691.2×
  176. 176Oklahoma CityOklahoma, United States
    681.2×
  177. 176BremertonWashington, United States
    681.2×
  178. 178Baton RougeLouisiana, United States
    681.2×
  179. 178Forest GroveOregon, United States
    681.2×
  180. 180Alto HospicioTarapacá, Chile
    681.2×
  181. 180Phenix CityAlabama, United States
    681.2×
  182. 180Ferry PassFlorida, United States
    681.2×
  183. 180McDonoughGeorgia, United States
    681.2×
  184. 180CanbyOregon, United States
    681.2×
  185. 185CelayaGuanajuato, Mexico
    681.2×
  186. 185MontgomeryAlabama, United States
    681.2×
  187. 185ChattanoogaTennessee, United States
    681.2×
  188. 188Santa CatarinaNuevo León, Mexico
    681.2×
  189. 188DentonTexas, United States
    681.2×
  190. 188PortlandOregon, United States
    681.2×
  191. 191TrussvilleAlabama, United States
    671.2×
  192. 191LebanonOhio, United States
    671.2×
  193. 191BeavertonOregon, United States
    671.2×
  194. 191SunnysideWashington, United States
    671.2×
  195. 195KnoxvilleTennessee, United States
    671.2×
  196. 196PaducahKentucky, United States
    671.2×
  197. 196SulphurLouisiana, United States
    671.2×
  198. 196White OakOhio, United States
    671.2×
  199. 196LaredoTexas, United States
    671.2×
  200. 196RichmondCalifornia, United States
    671.2×

Top 200 of 1,393 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 25, 2023, smogrank.com/history/2023-08-25 (accessed 2 Oct 2026).

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