SmogRank / History / August 20, 2023

Most polluted cities on August 20, 2023

1,738 cities ranked by their average PM2.5 over the day; the worst was Kelowna, Canada, at 267.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during August 20, 2023. All episodes.

← Kelowna 267.0 µg/m³ 200 µg/m³15 WHO 24-hour guideline
Every city ranked for August 20, 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. 1KelownaBritish Columbia, Canada
    38417.8×
  2. 2PentictonBritish Columbia, Canada
    35216.7×
  3. 3Walla WallaWashington, United States
    30215.1×
  4. 4SpokaneWashington, United States
    27613.4×
  5. 4VernonBritish Columbia, Canada
    27613.4×
  6. 6Tri-CitiesWashington, United States
    26812.9×
  7. 7Moses LakeWashington, United States
    26712.8×
  8. 8HermistonOregon, United States
    26612.7×
  9. 9PendletonOregon, United States
    25512.0×
  10. 10Spokane ValleyWashington, United States
    25011.7×
  11. 11The DallesOregon, United States
    24911.6×
  12. 12RedmondOregon, United States
    23010.3×
  13. 13PascoWashington, United States
    22710.1×
  14. 14SunnysideWashington, United States
    2239.9×
  15. 15PullmanWashington, United States
    2229.8×
  16. 16EllensburgWashington, United States
    2209.7×
  17. 17YakimaWashington, United States
    2159.3×
  18. 18KamloopsBritish Columbia, Canada
    2068.7×
  19. 19LewistonIdaho, United States
    1988.2×
  20. 20WenatcheeWashington, United States
    1978.1×
  21. 21BendOregon, United States
    1947.8×
  22. 22ChilliwackBritish Columbia, Canada
    1937.7×
  23. 23MoscowIdaho, United States
    1867.1×
  24. 24Coeur d'AleneIdaho, United States
    1846.8×
  25. 25DushanbeDushanbe, Tajikistan
    1715.6×
  26. 26CoyhaiqueAysén, Chile
    1685.3×
  27. 27AuburnWashington, United States
    1624.7×
  28. 28SquamishBritish Columbia, Canada
    1614.6×
  29. 29CoquitlamBritish Columbia, Canada
    1564.2×
  30. 30Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1554.1×
  31. 31Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1554.1×
  32. 32IssaquahWashington, United States
    1554.0×
  33. 33Columbia CityWashington, United States
    1544.0×
  34. 34ShorelineWashington, United States
    1544.0×
  35. 35CranbrookBritish Columbia, Canada
    1533.9×
  36. 36ManamaManama, Bahrain
    1523.8×
  37. 37ParklandWashington, United States
    1513.7×
  38. 38Grants PassOregon, United States
    1513.7×
  39. 39AshlandOregon, United States
    1483.6×
  40. 40EugeneOregon, United States
    1463.6×
  41. 41TacomaWashington, United States
    1433.5×
  42. 42RentonWashington, United States
    1423.5×
  43. 43Lahorelow-cost sensorsPunjab, Pakistan
    1373.3×
  44. 44Islamabadlow-cost sensorsIslamabad, Pakistan
    1333.2×
  45. 45OrchardsWashington, United States
    1333.2×
  46. 46MedfordOregon, United States
    1313.2×
  47. 47SeattleWashington, United States
    1263.0×
  48. 48West VancouverBritish Columbia, Canada
    1243.0×
  49. 49CanbyOregon, United States
    1243.0×
  50. 50Dhakalow-cost sensorsDhaka Division, Bangladesh
    1172.8×
  51. 51JakartaJakarta, Indonesia
    1162.8×
  52. 52GreshamOregon, United States
    1162.8×
  53. 53BremertonWashington, United States
    1152.7×
  54. 54AlexandriaAlexandria, Egypt
    1142.7×
  55. 55TigardOregon, United States
    1132.7×
  56. 56HillsboroOregon, United States
    1122.7×
  57. 57AbbotsfordBritish Columbia, Canada
    1112.6×
  58. 57BurnabyBritish Columbia, Canada
    1112.6×
  59. 59BellevueWashington, United States
    1112.6×
  60. 60OsornoLos Lagos Region, Chile
    1112.6×
  61. 61Salmon CreekWashington, United States
    1112.6×
  62. 62Forest GroveOregon, United States
    1102.6×
  63. 63KigaliKigali, Rwanda
    1102.6×
  64. 63BeavertonOregon, United States
    1102.6×
  65. 65PortlandOregon, United States
    1092.6×
  66. 66LangfordBritish Columbia, Canada
    1082.5×
  67. 67YumaArizona, United States
    1062.5×
  68. 68CentraliaWashington, United States
    1042.4×
  69. 69CatañoCataño, Puerto Rico
    1042.4×
  70. 70Port CoquitlamBritish Columbia, Canada
    1032.4×
  71. 71CuranilahueBiobio, Chile
    1022.4×
  72. 71VancouverWashington, United States
    1022.4×
  73. 73AlbanyOregon, United States
    1022.4×
  74. 74BeijingBeijing, China
    1012.4×
  75. 75CalgaryAlberta, Canada
    992.3×
  76. 76TemucoAraucania, Chile
    992.3×
  77. 77SalemOregon, United States
    992.3×
  78. 78Puerto AysénAysén, Chile
    972.3×
  79. 78Port AngelesWashington, United States
    972.3×
  80. 80North VancouverBritish Columbia, Canada
    972.3×
  81. 81WoodburnOregon, United States
    972.2×
  82. 82LangleyBritish Columbia, Canada
    952.2×
  83. 83AntananarivoAnalamanga, Madagascar
    942.1×
  84. 84Addis AbabaAddis Ababa, Ethiopia
    932.1×
  85. 84NacimientoBiobio, Chile
    932.1×
  86. 84Port AlberniBritish Columbia, Canada
    932.1×
  87. 87MilwaukieOregon, United States
    922.1×
  88. 88DelhiDelhi, India
    912.0×
  89. 88McMinnvilleOregon, United States
    912.0×
  90. 90HanoiHanoi, Vietnam
    902.0×
  91. 91DuncanBritish Columbia, Canada
    902.0×
  92. 92LongviewWashington, United States
    892.0×
  93. 93SarajevoFederation of B&H, Bosnia and Herzegovina
    881.9×
  94. 93DallasOregon, United States
    881.9×
  95. 95ShenyangLiaoning, China
    881.9×
  96. 96SenicaTrnava Region, Slovakia
    851.8×
  97. 97CopiapóAtacama, Chile
    851.8×
  98. 97CorvallisOregon, United States
    851.8×
  99. 99AntofagastaAntofagasta, Chile
    841.8×
  100. 100QuillotaValparaiso, Chile
    841.8×
  101. 101SheridanWyoming, United States
    831.8×
  102. 102SantiagoSantiago Metropolitan, Chile
    821.7×
  103. 102LaceyWashington, United States
    821.7×
  104. 104PristinaPristina, Kosovo
    821.7×
  105. 105MostÚstí nad Labem Region, Czechia
    811.7×
  106. 106ValdiviaLos Ríos Region, Chile
    811.7×
  107. 107West MifflinPennsylvania, United States
    801.7×
  108. 108La UniónLos Ríos Region, Chile
    801.6×
  109. 109HumennéPrešov Region, Slovakia
    801.6×
  110. 110HyderabadTelangana, India
    791.6×
  111. 111Samut SakhonSamut Sakhon, Thailand
    781.6×
  112. 111NaplesCampania, Italy
    781.6×
  113. 111OttawaOntario, Canada
    781.6×
  114. 114La OrotavaCanary Islands, Spain
    771.6×
  115. 114CoquimboCoquimbo Region, Chile
    771.6×
  116. 114AirdrieAlberta, Canada
    771.6×
  117. 117NairobiNairobi County, Kenya
    771.5×
  118. 117BratislavaBratislava Region, Slovakia
    771.5×
  119. 119TalaganteSantiago Metropolitan, Chile
    771.5×
  120. 120Vranov nad TopľouPrešov Region, Slovakia
    761.5×
  121. 120BirminghamAlabama, United States
    761.5×
  122. 120BarrieOntario, Canada
    761.5×
  123. 120ReginaSaskatchewan, Canada
    761.5×
  124. 124Nong KhaemBangkok, Thailand
    761.5×
  125. 124São PauloSão Paulo, Brazil
    761.5×
  126. 124Ciudad JuárezChihuahua, Mexico
    761.5×
  127. 127PrešovPrešov Region, Slovakia
    761.5×
  128. 127CoronelBiobio, Chile
    761.5×
  129. 127PeterboroughOntario, Canada
    761.5×
  130. 130Little RockArkansas, United States
    751.5×
  131. 130Lexingtonlow-cost sensorsMassachusetts, United States
    751.5×
  132. 130Eau ClaireWisconsin, United States
    751.5×
  133. 133NitraNitra Region, Slovakia
    751.5×
  134. 133DearbornMichigan, United States
    751.5×
  135. 135ChennaiTamil Nadu, India
    751.5×
  136. 135RochesterMinnesota, United States
    751.5×
  137. 137KasaokaOkayama, Japan
    741.4×
  138. 137QuinteroValparaiso, Chile
    741.4×
  139. 137HollandMichigan, United States
    741.4×
  140. 140KurumeFukuoka, Japan
    741.4×
  141. 141CornwallOntario, Canada
    741.4×
  142. 141GranbyQuebec, Canada
    741.4×
  143. 141North BayOntario, Canada
    741.4×
  144. 144GuangzhouGuangdong, China
    741.4×
  145. 145Puerto MonttLos Lagos Region, Chile
    731.4×
  146. 146BurnsvilleMinnesota, United States
    731.4×
  147. 146OakvilleOntario, Canada
    731.4×
  148. 148MinamataKumamoto, Japan
    731.4×
  149. 148AppletonWisconsin, United States
    731.4×
  150. 150JesiThe Marches, Italy
    731.4×
  151. 150ClevelandOhio, United States
    731.4×
  152. 152FujinomiyaShizuoka, Japan
    731.4×
  153. 152LitvínovÚstí nad Labem Region, Czechia
    731.4×
  154. 152Great FallsMontana, United States
    731.4×
  155. 152Greater SudburyOntario, Canada
    731.4×
  156. 156Bang Bo DistrictSamut Prakan, Thailand
    721.4×
  157. 156TepliceÚstí nad Labem Region, Czechia
    721.4×
  158. 156Port HuronMichigan, United States
    721.4×
  159. 159HonmachiKumamoto, Japan
    721.4×
  160. 159Maebaru-chūōFukuoka, Japan
    721.4×
  161. 159Puerto VarasLos Lagos Region, Chile
    721.4×
  162. 162ConcónValparaiso, Chile
    721.4×
  163. 162CelayaGuanajuato, Mexico
    721.4×
  164. 162DetroitMichigan, United States
    721.4×
  165. 162ShakopeeMinnesota, United States
    721.4×
  166. 166Saint CloudMinnesota, United States
    721.3×
  167. 166WindsorOntario, Canada
    721.3×
  168. 168SninaPrešov Region, Slovakia
    711.3×
  169. 168BelgradeCentral Serbia, Serbia
    711.3×
  170. 168Viña del MarValparaiso, Chile
    711.3×
  171. 168YamanashiYamanashi, Japan
    711.3×
  172. 172VilniusVilnius, Lithuania
    711.3×
  173. 172TrnavaTrnava Region, Slovakia
    711.3×
  174. 172Lincoln ParkMichigan, United States
    711.3×
  175. 175Grand RapidsMichigan, United States
    711.3×
  176. 175SarniaOntario, Canada
    711.3×
  177. 177Mladá BoleslavCentral Bohemia, Czechia
    711.3×
  178. 177BillingsMontana, United States
    711.3×
  179. 177Rapid CitySouth Dakota, United States
    711.3×
  180. 180Phra PradaengSamut Prakan, Thailand
    711.3×
  181. 180NewmarketOntario, Canada
    711.3×
  182. 182ŌtsukiYamanashi, Japan
    711.3×
  183. 182CantonOhio, United States
    711.3×
  184. 182GilletteWyoming, United States
    711.3×
  185. 185WilkinsburgPennsylvania, United States
    701.3×
  186. 185BurlingtonVermont, United States
    701.3×
  187. 185Green BayWisconsin, United States
    701.3×
  188. 185KogaFukuoka, Japan
    701.3×
  189. 189DěčínÚstí nad Labem Region, Czechia
    701.3×
  190. 189BellinghamWashington, United States
    701.3×
  191. 189St. ThomasOntario, Canada
    701.3×
  192. 192Tha BoNong Khai, Thailand
    701.3×
  193. 192Falconara MarittimaThe Marches, Italy
    701.3×
  194. 192LaredoTexas, United States
    701.3×
  195. 192MiltonOntario, Canada
    701.3×
  196. 196WarrenOhio, United States
    701.3×
  197. 197La SerenaCoquimbo Region, Chile
    701.3×
  198. 197Apple ValleyMinnesota, United States
    701.3×
  199. 197La CrosseWisconsin, United States
    701.3×
  200. 197SherbrookeQuebec, Canada
    701.3×

Top 200 of 1,738 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 20, 2023, smogrank.com/history/2023-08-20 (accessed 2 Oct 2026).

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