SmogRank / History / August 18, 2023

Most polluted cities on August 18, 2023

1,703 cities ranked by their average PM2.5 over the day; the worst was Redmond, United States, at 105.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during August 18, 2023. All episodes.

← Redmond 105.0 µg/m³ 100 µg/m³15 WHO 24-hour guideline
Every city ranked for August 18, 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. 1RedmondOregon, United States
    1867.0×
  2. 2CoyhaiqueAysén, Chile
    1856.9×
  3. 3AshlandOregon, United States
    1846.8×
  4. 4BendOregon, United States
    1846.8×
  5. 5MedfordOregon, United States
    1675.2×
  6. 6Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1544.0×
  7. 7Kampalalow-cost sensorsCentral Region, Uganda
    1523.8×
  8. 8KelownaBritish Columbia, Canada
    1513.7×
  9. 9KamloopsBritish Columbia, Canada
    1493.7×
  10. 10NacimientoBiobio, Chile
    1483.6×
  11. 11Fort McMurrayAlberta, Canada
    1463.6×
  12. 12Lahorelow-cost sensorsPunjab, Pakistan
    1463.6×
  13. 13Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1403.4×
  14. 14ManamaManama, Bahrain
    1373.3×
  15. 15DushanbeDushanbe, Tajikistan
    1363.3×
  16. 16TalcahuanoBiobio, Chile
    1323.2×
  17. 17ValdiviaLos Ríos Region, Chile
    1303.1×
  18. 18Los ÁngelesBiobio, Chile
    1283.1×
  19. 19SarajevoFederation of B&H, Bosnia and Herzegovina
    1233.0×
  20. 20KigaliKigali, Rwanda
    1233.0×
  21. 21HualquiBiobio, Chile
    1202.9×
  22. 22Islamabadlow-cost sensorsIslamabad, Pakistan
    1202.9×
  23. 23AlexandriaAlexandria, Egypt
    1192.9×
  24. 24DelhiDelhi, India
    1152.7×
  25. 25Puerto AysénAysén, Chile
    1152.7×
  26. 26San CarlosÑuble, Chile
    1142.7×
  27. 27RancaguaO'Higgins Region, Chile
    1132.7×
  28. 28AltamontOregon, United States
    1112.6×
  29. 29PentictonBritish Columbia, Canada
    1112.6×
  30. 30La UniónLos Ríos Region, Chile
    1102.6×
  31. 31Swift CurrentSaskatchewan, Canada
    1092.6×
  32. 32CranbrookBritish Columbia, Canada
    1082.6×
  33. 33Addis AbabaAddis Ababa, Ethiopia
    1082.6×
  34. 34MinneapolisMinnesota, United States
    1072.5×
  35. 35Puerto VarasLos Lagos Region, Chile
    1072.5×
  36. 36Puerto MonttLos Lagos Region, Chile
    1052.5×
  37. 37GuangzhouGuangdong, China
    1022.4×
  38. 38CoronelBiobio, Chile
    1022.4×
  39. 39HanoiHanoi, Vietnam
    992.3×
  40. 39RengoO'Higgins Region, Chile
    992.3×
  41. 41LinaresMaule Region, Chile
    972.3×
  42. 42SzegedCsongrád, Hungary
    972.2×
  43. 43Dhakalow-cost sensorsDhaka Division, Bangladesh
    962.2×
  44. 44CuranilahueBiobio, Chile
    952.2×
  45. 45RoeselareFlanders, Belgium
    932.1×
  46. 46TemucoAraucania, Chile
    932.1×
  47. 46TalcaMaule Region, Chile
    932.1×
  48. 48TocopillaAntofagasta, Chile
    932.1×
  49. 49ShenyangLiaoning, China
    922.1×
  50. 50AnconaThe Marches, Italy
    922.1×
  51. 50CauquenesMaule Region, Chile
    922.1×
  52. 52ConcepciónBiobio, Chile
    912.1×
  53. 53MaldegemFlanders, Belgium
    912.0×
  54. 54VernonBritish Columbia, Canada
    912.0×
  55. 55DunkirkHauts-de-France, France
    912.0×
  56. 56PristinaPristina, Kosovo
    902.0×
  57. 57Spokane ValleyWashington, United States
    902.0×
  58. 58EvergemFlanders, Belgium
    902.0×
  59. 59QuillotaValparaiso, Chile
    892.0×
  60. 60ToméBiobio, Chile
    892.0×
  61. 61ChiguayanteBiobio, Chile
    881.9×
  62. 62WaregemFlanders, Belgium
    881.9×
  63. 62ChillánÑuble, Chile
    881.9×
  64. 64BelgradeCentral Serbia, Serbia
    881.9×
  65. 64San Pedro de la PazBiobio, Chile
    881.9×
  66. 66KoksijdeFlanders, Belgium
    871.9×
  67. 67DuluthMinnesota, United States
    871.9×
  68. 68Saint CloudMinnesota, United States
    871.9×
  69. 68ReginaSaskatchewan, Canada
    871.9×
  70. 70AarschotFlanders, Belgium
    861.9×
  71. 71SalorTashkent Region, Uzbekistan
    861.9×
  72. 71CuricóMaule Region, Chile
    861.9×
  73. 73TournaiWallonia, Belgium
    851.8×
  74. 74KortrijkFlanders, Belgium
    851.8×
  75. 74BurnsvilleMinnesota, United States
    851.8×
  76. 76IzegemFlanders, Belgium
    851.8×
  77. 77AppletonWisconsin, United States
    841.8×
  78. 78ShakopeeMinnesota, United States
    841.8×
  79. 78SpokaneWashington, United States
    841.8×
  80. 80ChennaiTamil Nadu, India
    841.8×
  81. 80BrookingsSouth Dakota, United States
    841.8×
  82. 82Saint MichaelMinnesota, United States
    841.8×
  83. 83Banja LukaSrpska, Bosnia and Herzegovina
    831.8×
  84. 83SuperiorWisconsin, United States
    831.8×
  85. 85HyderabadTelangana, India
    831.8×
  86. 85TalaganteSantiago Metropolitan, Chile
    831.8×
  87. 87MolFlanders, Belgium
    821.7×
  88. 87ValenciennesHauts-de-France, France
    821.7×
  89. 89LilleHauts-de-France, France
    821.7×
  90. 90EdmontonAlberta, Canada
    821.7×
  91. 91Green BayWisconsin, United States
    821.7×
  92. 92Wan ChaiWan Chai, Hong Kong
    811.7×
  93. 93Apple ValleyMinnesota, United States
    811.7×
  94. 94MenenFlanders, Belgium
    811.7×
  95. 95RoubaixHauts-de-France, France
    811.7×
  96. 96Saint PaulMinnesota, United States
    801.7×
  97. 97GrimbergenFlanders, Belgium
    801.6×
  98. 97CatañoCataño, Puerto Rico
    801.6×
  99. 99Coeur d'AleneIdaho, United States
    801.6×
  100. 100Saint-QuentinHauts-de-France, France
    801.6×
  101. 101WillebroekFlanders, Belgium
    791.6×
  102. 102Le RobertMartinique, Martinique
    791.6×
  103. 103ReddingCalifornia, United States
    791.6×
  104. 104BeijingBeijing, China
    791.6×
  105. 105Franklin ParkIllinois, United States
    781.6×
  106. 106GentFlanders, Belgium
    781.6×
  107. 106AntwerpFlanders, Belgium
    781.6×
  108. 108Calumet CityIllinois, United States
    781.6×
  109. 109Puente AltoSantiago Metropolitan, Chile
    771.6×
  110. 110SantiagoSantiago Metropolitan, Chile
    771.5×
  111. 111ZwijndrechtFlanders, Belgium
    771.5×
  112. 111West FargoNorth Dakota, United States
    771.5×
  113. 113BrusselsBrussels Capital, Belgium
    771.5×
  114. 113Le LamentinMartinique, Martinique
    771.5×
  115. 115Ang Mo Kio New TownSingapore
    761.5×
  116. 115CoquimboCoquimbo Region, Chile
    761.5×
  117. 115WaukeshaWisconsin, United States
    761.5×
  118. 118Naucalpan de JuárezMéxico, Mexico
    761.5×
  119. 119LochristiFlanders, Belgium
    751.5×
  120. 120SninaPrešov Region, Slovakia
    751.5×
  121. 120BeverenFlanders, Belgium
    751.5×
  122. 122MonsWallonia, Belgium
    751.5×
  123. 122NapervilleIllinois, United States
    751.5×
  124. 124CaryIllinois, United States
    741.4×
  125. 124JolietIllinois, United States
    741.4×
  126. 126MilwaukeeWisconsin, United States
    741.4×
  127. 127StabroekFlanders, Belgium
    731.4×
  128. 127Des PlainesIllinois, United States
    731.4×
  129. 129AntofagastaAntofagasta, Chile
    731.4×
  130. 130KolkataWest Bengal, India
    731.4×
  131. 130Novi SadVojvodina, Serbia
    731.4×
  132. 132JeddahMecca Region, Saudi Arabia
    731.4×
  133. 132São PauloSão Paulo, Brazil
    731.4×
  134. 134BirminghamAlabama, United States
    721.4×
  135. 135OstravaMoravian-Silesian Region, Czechia
    721.4×
  136. 135HelenaMontana, United States
    721.4×
  137. 137AmiensHauts-de-France, France
    721.4×
  138. 137CopiapóAtacama, Chile
    721.4×
  139. 137Great FallsMontana, United States
    721.4×
  140. 140Fort-de-FranceMartinique, Martinique
    721.3×
  141. 141Vranov nad TopľouPrešov Region, Slovakia
    711.3×
  142. 141Nong KhaemBangkok, Thailand
    711.3×
  143. 143CalgaryAlberta, Canada
    711.3×
  144. 144East ChicagoIndiana, United States
    711.3×
  145. 144South MilwaukeeWisconsin, United States
    711.3×
  146. 146HollandMichigan, United States
    711.3×
  147. 147Viña del MarValparaiso, Chile
    701.3×
  148. 148HumennéPrešov Region, Slovakia
    701.3×
  149. 148CreilHauts-de-France, France
    701.3×
  150. 148RockfordIllinois, United States
    701.3×
  151. 151Karachilow-cost sensorsSindh, Pakistan
    701.3×
  152. 151Ulu BedokSingapore
    701.3×
  153. 151SenicaTrnava Region, Slovakia
    701.3×
  154. 151Thunder BayOntario, Canada
    701.3×
  155. 155RuseRuse, Bulgaria
    701.3×
  156. 155Falconara MarittimaThe Marches, Italy
    701.3×
  157. 155RochesterMinnesota, United States
    701.3×
  158. 158Red DeerAlberta, Canada
    701.3×
  159. 159JesiThe Marches, Italy
    691.3×
  160. 159Eau ClaireWisconsin, United States
    691.3×
  161. 159MadisonWisconsin, United States
    691.3×
  162. 162NairobiNairobi County, Kenya
    691.3×
  163. 162Tha BoNong Khai, Thailand
    691.3×
  164. 164CharleroiWallonia, Belgium
    691.3×
  165. 164Silao de la VictoriaGuanajuato, Mexico
    691.3×
  166. 164BlaineMinnesota, United States
    691.3×
  167. 167WatertownSouth Dakota, United States
    691.2×
  168. 168IndianapolisIndiana, United States
    691.2×
  169. 168Grand RapidsMichigan, United States
    691.2×
  170. 170Phra PradaengSamut Prakan, Thailand
    681.2×
  171. 171BitolaBitola, North Macedonia
    681.2×
  172. 171KapellenFlanders, Belgium
    681.2×
  173. 171CalaisHauts-de-France, France
    681.2×
  174. 171GaryIndiana, United States
    681.2×
  175. 175Bang Bo DistrictSamut Prakan, Thailand
    681.2×
  176. 175PécsBaranya, Hungary
    681.2×
  177. 177LethbridgeAlberta, Canada
    681.2×
  178. 178TetovoTetovo, North Macedonia
    681.2×
  179. 178BratislavaBratislava Region, Slovakia
    681.2×
  180. 178NorthbrookIllinois, United States
    681.2×
  181. 181VilniusVilnius, Lithuania
    671.2×
  182. 181PrešovPrešov Region, Slovakia
    671.2×
  183. 181DagenhamEngland, United Kingdom
    671.2×
  184. 181LiberpolisCounty of Osijek-Baranja, Croatia
    671.2×
  185. 185AlgiersAlgiers, Algeria
    671.2×
  186. 185LondonEngland, United Kingdom
    671.2×
  187. 185PortageIndiana, United States
    671.2×
  188. 185ButteMontana, United States
    671.2×
  189. 189JenisonMichigan, United States
    671.2×
  190. 190FujinomiyaShizuoka, Japan
    671.2×
  191. 190SliemaTas-Sliema, Malta
    671.2×
  192. 190RouenNormandy, France
    671.2×
  193. 190DieppeNormandy, France
    671.2×
  194. 190QuinteroValparaiso, Chile
    671.2×
  195. 190CalamaAntofagasta, Chile
    671.2×
  196. 190BloomingtonIllinois, United States
    671.2×
  197. 197LouviersNormandy, France
    671.2×
  198. 197ConcónValparaiso, Chile
    671.2×
  199. 199Castelló de la PlanaValencia, Spain
    661.2×
  200. 200Samut SakhonSamut Sakhon, Thailand
    661.2×

Top 200 of 1,703 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 18, 2023, smogrank.com/history/2023-08-18 (accessed 2 Oct 2026).

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