SmogRank / History / August 4, 2023

Most polluted cities on August 4, 2023

1,610 cities ranked by their average PM2.5 over the day; the worst was Osorno, Chile, at 112.0 µg/m³. Each city's own local calendar day.

← Osorno 112.0 µg/m³ 100 µg/m³15 WHO 24-hour guideline
Every city ranked for August 4, 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. 1OsornoLos Lagos Region, Chile
    1917.5×
  2. 2Puerto VarasLos Lagos Region, Chile
    1897.3×
  3. 3Puerto MonttLos Lagos Region, Chile
    1766.1×
  4. 4La UniónLos Ríos Region, Chile
    1715.6×
  5. 5CoronelBiobio, Chile
    1685.3×
  6. 6VernonBritish Columbia, Canada
    1594.5×
  7. 7HualquiBiobio, Chile
    1574.3×
  8. 8RancaguaO'Higgins Region, Chile
    1533.9×
  9. 9ValdiviaLos Ríos Region, Chile
    1493.7×
  10. 10ManamaManama, Bahrain
    1473.6×
  11. 11JakartaJakarta, Indonesia
    1423.5×
  12. 12TalaganteSantiago Metropolitan, Chile
    1393.4×
  13. 12RengoO'Higgins Region, Chile
    1393.4×
  14. 14SantiagoSantiago Metropolitan, Chile
    1393.4×
  15. 14Santa Anita - Los FicusLima region, Peru
    1393.4×
  16. 16TemucoAraucania, Chile
    1363.3×
  17. 17Dhakalow-cost sensorsDhaka Division, Bangladesh
    1343.3×
  18. 18DushanbeDushanbe, Tajikistan
    1323.2×
  19. 19Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1293.1×
  20. 20LinaresMaule Region, Chile
    1283.1×
  21. 21NacimientoBiobio, Chile
    1253.0×
  22. 22CuranilahueBiobio, Chile
    1182.8×
  23. 23West FargoNorth Dakota, United States
    1092.6×
  24. 24CuricóMaule Region, Chile
    1092.6×
  25. 25Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1082.6×
  26. 26Puente AltoSantiago Metropolitan, Chile
    1082.5×
  27. 27TalcahuanoBiobio, Chile
    1042.4×
  28. 28TalcaMaule Region, Chile
    1022.4×
  29. 29CranbrookBritish Columbia, Canada
    992.3×
  30. 30MexicaliBaja California, Mexico
    992.3×
  31. 31Lahorelow-cost sensorsPunjab, Pakistan
    992.3×
  32. 32KelownaBritish Columbia, Canada
    972.2×
  33. 33ChillánÑuble, Chile
    972.2×
  34. 34Addis AbabaAddis Ababa, Ethiopia
    962.2×
  35. 35Viña del MarValparaiso, Chile
    962.2×
  36. 36CauquenesMaule Region, Chile
    952.2×
  37. 37PristinaPristina, Kosovo
    952.2×
  38. 38LotaBiobio, Chile
    942.2×
  39. 39BamakoBamako, Mali
    932.1×
  40. 40QuillotaValparaiso, Chile
    922.1×
  41. 41São PauloSão Paulo, Brazil
    892.0×
  42. 42LimaLima Province, Peru
    892.0×
  43. 43DelhiDelhi, India
    881.9×
  44. 43BadgerAlaska, United States
    881.9×
  45. 45ShenyangLiaoning, China
    881.9×
  46. 46HyderabadTelangana, India
    861.9×
  47. 47Karachilow-cost sensorsSindh, Pakistan
    861.9×
  48. 48Great FallsMontana, United States
    851.8×
  49. 49QuinteroValparaiso, Chile
    851.8×
  50. 50SaskatoonSaskatchewan, Canada
    841.8×
  51. 51Islamabadlow-cost sensorsIslamabad, Pakistan
    841.8×
  52. 52AntofagastaAntofagasta, Chile
    831.8×
  53. 53ConcónValparaiso, Chile
    831.8×
  54. 53Prince AlbertSaskatchewan, Canada
    831.8×
  55. 55BeijingBeijing, China
    831.8×
  56. 55WarrenOhio, United States
    831.8×
  57. 57Victoria de DurangoDurango, Mexico
    831.7×
  58. 58ChennaiTamil Nadu, India
    831.7×
  59. 59ChiguayanteBiobio, Chile
    821.7×
  60. 60Nong KhaemBangkok, Thailand
    821.7×
  61. 60CantonOhio, United States
    821.7×
  62. 62San Pedro de la PazBiobio, Chile
    811.7×
  63. 63ToméBiobio, Chile
    811.7×
  64. 63CopiapóAtacama, Chile
    811.7×
  65. 65KalamazooMichigan, United States
    811.7×
  66. 66CheektowagaNew York, United States
    801.6×
  67. 66YoungstownOhio, United States
    801.6×
  68. 66Swift CurrentSaskatchewan, Canada
    801.6×
  69. 69ClevelandOhio, United States
    791.6×
  70. 70CoyhaiqueAysén, Chile
    791.6×
  71. 71DuluthMinnesota, United States
    791.6×
  72. 72SuperiorWisconsin, United States
    791.6×
  73. 73AkronOhio, United States
    781.6×
  74. 73FairbanksAlaska, United States
    781.6×
  75. 73St. ThomasOntario, Canada
    781.6×
  76. 76XonacatlánMéxico, Mexico
    781.6×
  77. 76MedinaOhio, United States
    781.6×
  78. 78KolkataWest Bengal, India
    771.6×
  79. 79Shaker HeightsOhio, United States
    771.5×
  80. 80Villa Poeta José Gálvez BarrenecheaLima region, Peru
    771.5×
  81. 81OakvilleOntario, Canada
    771.5×
  82. 82LondonOntario, Canada
    761.5×
  83. 83BrantfordOntario, Canada
    761.5×
  84. 84ReginaSaskatchewan, Canada
    761.5×
  85. 85Los ÁngelesBiobio, Chile
    761.5×
  86. 85Ciudad ApodacaNuevo León, Mexico
    761.5×
  87. 87RochesterNew York, United States
    751.5×
  88. 88EriePennsylvania, United States
    751.5×
  89. 89AppletonWisconsin, United States
    751.5×
  90. 89Rouyn-NorandaQuebec, Canada
    751.5×
  91. 91ConcepciónBiobio, Chile
    751.5×
  92. 92HanoiHanoi, Vietnam
    741.4×
  93. 92NorwoodOhio, United States
    741.4×
  94. 92WaterdownOntario, Canada
    741.4×
  95. 95MiddletownOhio, United States
    741.4×
  96. 96CalamaAntofagasta, Chile
    741.4×
  97. 96AricaArica y Parinacota Region, Chile
    741.4×
  98. 96South BendIndiana, United States
    741.4×
  99. 99WestervilleOhio, United States
    741.4×
  100. 100CoquimboCoquimbo Region, Chile
    741.4×
  101. 100IndianapolisIndiana, United States
    741.4×
  102. 100KenmoreNew York, United States
    741.4×
  103. 100Greater SudburyOntario, Canada
    741.4×
  104. 104DaytonOhio, United States
    731.4×
  105. 104KitchenerOntario, Canada
    731.4×
  106. 106WindsorOntario, Canada
    731.4×
  107. 107DetroitMichigan, United States
    731.4×
  108. 107AltamontOregon, United States
    731.4×
  109. 107NewmarketOntario, Canada
    731.4×
  110. 110SarajevoFederation of B&H, Bosnia and Herzegovina
    731.4×
  111. 110Sault Ste. MarieOntario, Canada
    731.4×
  112. 112Lincoln ParkMichigan, United States
    731.4×
  113. 112Green BayWisconsin, United States
    731.4×
  114. 114North BayOntario, Canada
    721.4×
  115. 115Puerto AysénAysén, Chile
    721.4×
  116. 115MiltonOntario, Canada
    721.4×
  117. 117DearbornMichigan, United States
    721.4×
  118. 117YpsilantiMichigan, United States
    721.4×
  119. 117PentictonBritish Columbia, Canada
    721.4×
  120. 120HollandMichigan, United States
    721.3×
  121. 121TakasakiGunma, Japan
    711.3×
  122. 121CincinnatiOhio, United States
    711.3×
  123. 123Saint CloudMinnesota, United States
    711.3×
  124. 124Little RockArkansas, United States
    711.3×
  125. 124HamiltonOntario, Canada
    711.3×
  126. 126AthensAttica, Greece
    711.3×
  127. 126MasonOhio, United States
    711.3×
  128. 126St. CatharinesOntario, Canada
    711.3×
  129. 129ToledoOhio, United States
    711.3×
  130. 130GuelphOntario, Canada
    711.3×
  131. 131MadisonWisconsin, United States
    701.3×
  132. 131MississaugaOntario, Canada
    701.3×
  133. 133Phra PradaengSamut Prakan, Thailand
    701.3×
  134. 133Bang Bo DistrictSamut Prakan, Thailand
    701.3×
  135. 135Alto HospicioTarapacá, Chile
    701.3×
  136. 136TaylorMichigan, United States
    701.3×
  137. 137AsprópyrgosAttica, Greece
    691.3×
  138. 137BarrieOntario, Canada
    691.3×
  139. 139SalorTashkent Region, Uzbekistan
    691.3×
  140. 139HelenaMontana, United States
    691.3×
  141. 139BramptonOntario, Canada
    691.3×
  142. 139Fort McMurrayAlberta, Canada
    691.3×
  143. 143Cluj-NapocaCluj County, Romania
    691.2×
  144. 144NagaiYamagata, Japan
    691.2×
  145. 144HermitagePennsylvania, United States
    691.2×
  146. 146Fort ThomasKentucky, United States
    681.2×
  147. 146DublinOhio, United States
    681.2×
  148. 148RuseRuse, Bulgaria
    681.2×
  149. 149San Francisco TlalcilalcalpanMéxico, Mexico
    681.2×
  150. 149LebanonOhio, United States
    681.2×
  151. 149SpringfieldOhio, United States
    681.2×
  152. 149PittsburghPennsylvania, United States
    681.2×
  153. 153TocopillaAntofagasta, Chile
    671.2×
  154. 153Eau ClaireWisconsin, United States
    671.2×
  155. 155BangkokBangkok, Thailand
    671.2×
  156. 155Ciudad Benito JuárezNuevo León, Mexico
    671.2×
  157. 155Port HuronMichigan, United States
    671.2×
  158. 158SarniaOntario, Canada
    671.2×
  159. 159JolietIllinois, United States
    671.2×
  160. 159ElkhartIndiana, United States
    671.2×
  161. 161Franklin ParkIllinois, United States
    661.2×
  162. 161NapervilleIllinois, United States
    661.2×
  163. 161LansingMichigan, United States
    661.2×
  164. 161TorontoOntario, Canada
    661.2×
  165. 165Khlong LuangPathum Thani, Thailand
    661.1×
  166. 166La SerenaCoquimbo Region, Chile
    661.1×
  167. 167MilwaukeeWisconsin, United States
    661.1×
  168. 168CalgaryAlberta, Canada
    651.1×
  169. 169Bang KapiBangkok, Thailand
    651.1×
  170. 169Santa CatarinaNuevo León, Mexico
    651.1×
  171. 171Botevgradlow-cost sensorsSofia, Bulgaria
    651.1×
  172. 171ChikuseiIbaraki, Japan
    651.1×
  173. 173Calumet CityIllinois, United States
    651.1×
  174. 174JeffersonvilleIndiana, United States
    651.1×
  175. 175BucharestBucharest, Romania
    641.1×
  176. 175IshinomakiMiyagi, Japan
    641.1×
  177. 177ColumbusIndiana, United States
    641.1×
  178. 177ChathamOntario, Canada
    641.1×
  179. 179ŌtsukiYamanashi, Japan
    641.1×
  180. 180NorthbrookIllinois, United States
    641.1×
  181. 180West MifflinPennsylvania, United States
    641.1×
  182. 180JōetsuNiigata, Japan
    641.1×
  183. 183KofuYamanashi, Japan
    641.1×
  184. 183MonterreyNuevo León, Mexico
    641.1×
  185. 185Samut PrakanSamut Prakan, Thailand
    631.1×
  186. 185TijuanaBaja California, Mexico
    631.1×
  187. 185BensalemPennsylvania, United States
    631.1×
  188. 185WilkinsburgPennsylvania, United States
    631.1×
  189. 189MumbaiMaharashtra, India
    631.0×
  190. 189GuangzhouGuangdong, China
    631.0×
  191. 189Ciudad JuárezChihuahua, Mexico
    631.0×
  192. 189AndersonIndiana, United States
    631.0×
  193. 193KiryūGunma, Japan
    631.0×
  194. 193KokomoIndiana, United States
    631.0×
  195. 195AcharnésAttica, Greece
    631.0×
  196. 195SagaeYamagata, Japan
    631.0×
  197. 195RockfordIllinois, United States
    631.0×
  198. 195PortageIndiana, United States
    631.0×
  199. 195Bay CityMichigan, United States
    631.0×
  200. 200MorrisvilleNorth Carolina, United States
    631.0×

Top 200 of 1,610 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 4, 2023, smogrank.com/history/2023-08-04 (accessed 2 Oct 2026).

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