SmogRank / History / August 16, 2023

Most polluted cities on August 16, 2023

1,861 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 16, 2023. All episodes.

← Piedras Negras 986.0 µg/m³ 900 µg/m³15 WHO 24-hour guideline
Every city ranked for August 16, 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. 2RedmondOregon, United States
    2189.5×
  3. 3BendOregon, United States
    1897.3×
  4. 4Dhakalow-cost sensorsDhaka Division, Bangladesh
    1735.8×
  5. 5DushanbeDushanbe, Tajikistan
    1443.5×
  6. 6CoyhaiqueAysén, Chile
    1393.4×
  7. 7Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1353.3×
  8. 8Lahorelow-cost sensorsPunjab, Pakistan
    1323.2×
  9. 8KolkataWest Bengal, India
    1323.2×
  10. 10Kampalalow-cost sensorsCentral Region, Uganda
    1313.2×
  11. 11Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1293.1×
  12. 12North BayOntario, Canada
    1233.0×
  13. 13AnconaThe Marches, Italy
    1222.9×
  14. 14NacimientoBiobio, Chile
    1202.9×
  15. 15DelhiDelhi, India
    1132.7×
  16. 16HanoiHanoi, Vietnam
    1112.6×
  17. 17AlexandriaAlexandria, Egypt
    1102.6×
  18. 17Fort McMurrayAlberta, Canada
    1102.6×
  19. 19OakvilleOntario, Canada
    1102.6×
  20. 20BarrieOntario, Canada
    1082.6×
  21. 21Addis AbabaAddis Ababa, Ethiopia
    1062.5×
  22. 21ShenyangLiaoning, China
    1062.5×
  23. 23KigaliKigali, Rwanda
    1042.4×
  24. 24NewmarketOntario, Canada
    1022.4×
  25. 25MexicaliBaja California, Mexico
    992.3×
  26. 26OsornoLos Lagos Region, Chile
    982.3×
  27. 27Islamabadlow-cost sensorsIslamabad, Pakistan
    972.2×
  28. 27MiltonOntario, Canada
    972.2×
  29. 29N'DjamenaN’Djaména, Chad
    962.2×
  30. 30Greater SudburyOntario, Canada
    962.2×
  31. 31MississaugaOntario, Canada
    952.2×
  32. 32WaterdownOntario, Canada
    942.2×
  33. 33KitchenerOntario, Canada
    942.1×
  34. 34BramptonOntario, Canada
    932.1×
  35. 34TorontoOntario, Canada
    932.1×
  36. 36LondonOntario, Canada
    932.1×
  37. 37GuelphOntario, Canada
    922.1×
  38. 38ChennaiTamil Nadu, India
    912.0×
  39. 39RengoO'Higgins Region, Chile
    912.0×
  40. 40Puerto MonttLos Lagos Region, Chile
    902.0×
  41. 40St. ThomasOntario, Canada
    902.0×
  42. 42PristinaPristina, Kosovo
    902.0×
  43. 43NairobiNairobi County, Kenya
    902.0×
  44. 44BeijingBeijing, China
    902.0×
  45. 45RancaguaO'Higgins Region, Chile
    902.0×
  46. 45Puerto VarasLos Lagos Region, Chile
    902.0×
  47. 47Le RobertMartinique, Martinique
    892.0×
  48. 48SarajevoFederation of B&H, Bosnia and Herzegovina
    892.0×
  49. 49CuricóMaule Region, Chile
    881.9×
  50. 50BrantfordOntario, Canada
    881.9×
  51. 50HamiltonOntario, Canada
    881.9×
  52. 52JesiThe Marches, Italy
    871.9×
  53. 53HelenaMontana, United States
    871.9×
  54. 54Le LamentinMartinique, Martinique
    861.9×
  55. 55GuangzhouGuangdong, China
    861.9×
  56. 56CatañoCataño, Puerto Rico
    851.8×
  57. 57Victoria de DurangoDurango, Mexico
    851.8×
  58. 58TemucoAraucania, Chile
    841.8×
  59. 59CuranilahueBiobio, Chile
    841.8×
  60. 60SantiagoSantiago Metropolitan, Chile
    841.8×
  61. 61ValdiviaLos Ríos Region, Chile
    831.8×
  62. 61LimaLima Province, Peru
    831.8×
  63. 63MoscowIdaho, United States
    831.8×
  64. 64Fort-de-FranceMartinique, Martinique
    831.7×
  65. 65Falconara MarittimaThe Marches, Italy
    821.7×
  66. 66AltamontOregon, United States
    821.7×
  67. 67Thunder BayOntario, Canada
    821.7×
  68. 68São PauloSão Paulo, Brazil
    811.7×
  69. 69Ciudad ApodacaNuevo León, Mexico
    811.7×
  70. 69Santa Anita - Los FicusLima region, Peru
    811.7×
  71. 71CalgaryAlberta, Canada
    811.7×
  72. 72Karachilow-cost sensorsSindh, Pakistan
    811.7×
  73. 73St. CatharinesOntario, Canada
    801.7×
  74. 74Moses LakeWashington, United States
    801.6×
  75. 75Puente AltoSantiago Metropolitan, Chile
    801.6×
  76. 76AlgiersAlgiers, Algeria
    791.6×
  77. 76CoronelBiobio, Chile
    791.6×
  78. 76ButteMontana, United States
    791.6×
  79. 79TalaganteSantiago Metropolitan, Chile
    791.6×
  80. 80AntananarivoAnalamanga, Madagascar
    791.6×
  81. 81Viña del MarValparaiso, Chile
    781.6×
  82. 82HyderabadTelangana, India
    771.5×
  83. 83JeddahMecca Region, Saudi Arabia
    771.5×
  84. 83XonacatlánMéxico, Mexico
    771.5×
  85. 85CincinnatiOhio, United States
    771.5×
  86. 86PrešovPrešov Region, Slovakia
    761.5×
  87. 86WolfsbergCarinthia, Austria
    761.5×
  88. 86HualquiBiobio, Chile
    761.5×
  89. 89TrnavaTrnava Region, Slovakia
    761.5×
  90. 89NorwoodOhio, United States
    761.5×
  91. 91DębicaSubcarpathia, Poland
    761.5×
  92. 91Santa CatarinaNuevo León, Mexico
    761.5×
  93. 91Ciudad JuárezChihuahua, Mexico
    761.5×
  94. 94BakuBaki, Azerbaijan
    751.5×
  95. 94Wan ChaiWan Chai, Hong Kong
    751.5×
  96. 96Ciudad Benito JuárezNuevo León, Mexico
    751.5×
  97. 96Fort ThomasKentucky, United States
    751.5×
  98. 98Marche-en-FamenneWallonia, Belgium
    751.5×
  99. 98Hradec KrálovéHradec Králové Region, Czechia
    751.5×
  100. 98MissoulaMontana, United States
    751.5×
  101. 101JeffersontownKentucky, United States
    741.4×
  102. 102NiskoSubcarpathia, Poland
    741.4×
  103. 102LiberecLiberec Region, Czechia
    741.4×
  104. 104La UniónLos Ríos Region, Chile
    741.4×
  105. 104CoquimboCoquimbo Region, Chile
    741.4×
  106. 104CauquenesMaule Region, Chile
    741.4×
  107. 104WenatcheeWashington, United States
    741.4×
  108. 108TlaquepaqueJalisco, Mexico
    741.4×
  109. 108EugeneOregon, United States
    741.4×
  110. 110Prince AlbertSaskatchewan, Canada
    731.4×
  111. 111PrzemyślSubcarpathia, Poland
    731.4×
  112. 111SenicaTrnava Region, Slovakia
    731.4×
  113. 111ChillánÑuble, Chile
    731.4×
  114. 114AntofagastaAntofagasta, Chile
    731.4×
  115. 115ZamośćLublin, Poland
    731.4×
  116. 115ClevelandOhio, United States
    731.4×
  117. 115Rouyn-NorandaQuebec, Canada
    731.4×
  118. 118Los ÁngelesBiobio, Chile
    731.4×
  119. 119LublinLublin, Poland
    721.4×
  120. 119EriePennsylvania, United States
    721.4×
  121. 121San Francisco TlalcilalcalpanMéxico, Mexico
    721.4×
  122. 122KrakówLesser Poland, Poland
    721.4×
  123. 123IshinomakiMiyagi, Japan
    721.4×
  124. 123HavířovMoravian-Silesian Region, Czechia
    721.4×
  125. 123KaliszGreater Poland, Poland
    721.4×
  126. 123Great FallsMontana, United States
    721.4×
  127. 127BuffaloNew York, United States
    721.3×
  128. 128NagaiYamagata, Japan
    711.3×
  129. 128Saint MatthewsKentucky, United States
    711.3×
  130. 128MasonOhio, United States
    711.3×
  131. 131JeffersonvilleIndiana, United States
    711.3×
  132. 132SunnysideWashington, United States
    711.3×
  133. 132YatomiAichi, Japan
    711.3×
  134. 134NišCentral Serbia, Serbia
    711.3×
  135. 135La Línea de la ConcepciónAndalusia, Spain
    711.3×
  136. 135OstravaMoravian-Silesian Region, Czechia
    711.3×
  137. 137BelgradeCentral Serbia, Serbia
    711.3×
  138. 137MiddletownOhio, United States
    711.3×
  139. 139TetovoTetovo, North Macedonia
    701.3×
  140. 139Mladá BoleslavCentral Bohemia, Czechia
    701.3×
  141. 139SarniaOntario, Canada
    701.3×
  142. 142San CarlosÑuble, Chile
    701.3×
  143. 142Puerto AysénAysén, Chile
    701.3×
  144. 144Český TěšínMoravian-Silesian Region, Czechia
    701.3×
  145. 144RadomskoŁódź Voivodeship, Poland
    701.3×
  146. 144East Saint LouisIllinois, United States
    701.3×
  147. 147AirdrieAlberta, Canada
    701.3×
  148. 148OlomoucOlomouc Region, Czechia
    691.3×
  149. 148LotaBiobio, Chile
    691.3×
  150. 148CopiapóAtacama, Chile
    691.3×
  151. 148ChathamOntario, Canada
    691.3×
  152. 152PřerovOlomouc Region, Czechia
    691.3×
  153. 153QuillotaValparaiso, Chile
    691.3×
  154. 153KenmoreNew York, United States
    691.3×
  155. 155SalorTashkent Region, Uzbekistan
    691.2×
  156. 155Klagenfurt am WörtherseeCarinthia, Austria
    691.2×
  157. 155GrazStyria, Austria
    691.2×
  158. 158KošiceKošice Region, Slovakia
    691.2×
  159. 158Banja LukaSrpska, Bosnia and Herzegovina
    691.2×
  160. 158CheektowagaNew York, United States
    691.2×
  161. 161ŁukówLublin, Poland
    691.2×
  162. 161BratislavaBratislava Region, Slovakia
    691.2×
  163. 161RacibórzSilesia, Poland
    691.2×
  164. 161PesaroThe Marches, Italy
    691.2×
  165. 161TocopillaAntofagasta, Chile
    691.2×
  166. 161LouisvilleKentucky, United States
    691.2×
  167. 161LebanonOhio, United States
    691.2×
  168. 168MielecSubcarpathia, Poland
    681.2×
  169. 168Nong KhaemBangkok, Thailand
    681.2×
  170. 168Frýdek-MístekMoravian-Silesian Region, Czechia
    681.2×
  171. 168MedfordOregon, United States
    681.2×
  172. 172NitraNitra Region, Slovakia
    681.2×
  173. 172SpringfieldOhio, United States
    681.2×
  174. 174ValdemoroMadrid, Spain
    681.2×
  175. 174ReginaSaskatchewan, Canada
    681.2×
  176. 174WindsorOntario, Canada
    681.2×
  177. 177VilniusVilnius, Lithuania
    681.2×
  178. 177OpavaMoravian-Silesian Region, Czechia
    681.2×
  179. 177KatowiceSilesia, Poland
    681.2×
  180. 177LinaresMaule Region, Chile
    681.2×
  181. 177ChikuseiIbaraki, Japan
    681.2×
  182. 182DěčínÚstí nad Labem Region, Czechia
    681.2×
  183. 182TalcaMaule Region, Chile
    681.2×
  184. 184ZnojmoSouth Moravian, Czechia
    671.2×
  185. 185KrapkowiceOpole Voivodeship, Poland
    671.2×
  186. 185Port HuronMichigan, United States
    671.2×
  187. 187Vranov nad TopľouPrešov Region, Slovakia
    671.2×
  188. 187AugustówPodlasie, Poland
    671.2×
  189. 187Kędzierzyn-KoźleOpole Voivodeship, Poland
    671.2×
  190. 187WestervilleOhio, United States
    671.2×
  191. 191MiuraKanagawa, Japan
    671.2×
  192. 191DaytonOhio, United States
    671.2×
  193. 191AyaseKanagawa, Japan
    671.2×
  194. 194Botevgradlow-cost sensorsSofia, Bulgaria
    671.2×
  195. 194PardubicePardubice Region, Czechia
    671.2×
  196. 194KłodzkoLower Silesia, Poland
    671.2×
  197. 194CuencaCastille-La Mancha, Spain
    671.2×
  198. 194TolucaMéxico, Mexico
    671.2×
  199. 199AricaArica y Parinacota Region, Chile
    661.2×
  200. 199DetroitMichigan, United States
    661.2×

Top 200 of 1,861 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 16, 2023, smogrank.com/history/2023-08-16 (accessed 2 Oct 2026).

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