SmogRank / History / August 2, 2023

Most polluted cities on August 2, 2023

1,883 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.

← Piedras Negras 986.0 µg/m³ 900 µg/m³15 WHO 24-hour guideline
Every city ranked for August 2, 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. 2MexicaliBaja California, Mexico
    1947.8×
  3. 3Fort McMurrayAlberta, Canada
    1594.4×
  4. 4Puerto VarasLos Lagos Region, Chile
    1544.0×
  5. 5NacimientoBiobio, Chile
    1533.9×
  6. 6Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1503.7×
  7. 7Lahorelow-cost sensorsPunjab, Pakistan
    1473.6×
  8. 8SantiagoSantiago Metropolitan, Chile
    1463.6×
  9. 9QuillotaValparaiso, Chile
    1443.5×
  10. 10Kampalalow-cost sensorsCentral Region, Uganda
    1423.5×
  11. 11DushanbeDushanbe, Tajikistan
    1413.5×
  12. 12Puerto MonttLos Lagos Region, Chile
    1373.3×
  13. 13La UniónLos Ríos Region, Chile
    1353.3×
  14. 14TalaganteSantiago Metropolitan, Chile
    1333.2×
  15. 15OsornoLos Lagos Region, Chile
    1182.8×
  16. 16KamloopsBritish Columbia, Canada
    1182.8×
  17. 17HualquiBiobio, Chile
    1122.7×
  18. 18ManamaManama, Bahrain
    1122.7×
  19. 19JakartaJakarta, Indonesia
    1112.6×
  20. 20ValdiviaLos Ríos Region, Chile
    1102.6×
  21. 21Puente AltoSantiago Metropolitan, Chile
    1092.6×
  22. 22Santa Anita - Los FicusLima region, Peru
    1092.6×
  23. 23ToméBiobio, Chile
    1082.5×
  24. 24Addis AbabaAddis Ababa, Ethiopia
    1042.5×
  25. 25CoronelBiobio, Chile
    1022.4×
  26. 26HanoiHanoi, Vietnam
    982.3×
  27. 27QuinteroValparaiso, Chile
    962.2×
  28. 28Great FallsMontana, United States
    962.2×
  29. 29PristinaPristina, Kosovo
    952.2×
  30. 30IssaquahWashington, United States
    952.2×
  31. 31São PauloSão Paulo, Brazil
    932.1×
  32. 32ChennaiTamil Nadu, India
    922.1×
  33. 33RancaguaO'Higgins Region, Chile
    912.0×
  34. 34CoyhaiqueAysén, Chile
    912.0×
  35. 35CoquimboCoquimbo Region, Chile
    912.0×
  36. 36Islamabadlow-cost sensorsIslamabad, Pakistan
    892.0×
  37. 37BamakoBamako, Mali
    881.9×
  38. 38BeijingBeijing, China
    881.9×
  39. 39TalcaMaule Region, Chile
    871.9×
  40. 40TalcahuanoBiobio, Chile
    861.9×
  41. 40RengoO'Higgins Region, Chile
    861.9×
  42. 42LimaLima Province, Peru
    851.8×
  43. 43TemucoAraucania, Chile
    851.8×
  44. 44Viña del MarValparaiso, Chile
    851.8×
  45. 45GuangzhouGuangdong, China
    841.8×
  46. 46La SerenaCoquimbo Region, Chile
    841.8×
  47. 47ConcónValparaiso, Chile
    841.8×
  48. 48AntananarivoAnalamanga, Madagascar
    841.8×
  49. 49Karachilow-cost sensorsSindh, Pakistan
    831.8×
  50. 49CuranilahueBiobio, Chile
    831.8×
  51. 51ChiguayanteBiobio, Chile
    831.7×
  52. 52CantonOhio, United States
    821.7×
  53. 53Prince AlbertSaskatchewan, Canada
    821.7×
  54. 54Şabāḩ as SālimMubārak al Kabīr, Kuwait
    801.7×
  55. 54AntofagastaAntofagasta, Chile
    801.7×
  56. 54SteubenvilleOhio, United States
    801.7×
  57. 57SpringdaleArkansas, United States
    791.6×
  58. 58West MifflinPennsylvania, United States
    791.6×
  59. 59SpringfieldOhio, United States
    781.6×
  60. 60CuricóMaule Region, Chile
    771.6×
  61. 61CauquenesMaule Region, Chile
    771.5×
  62. 62Nong KhaemBangkok, Thailand
    761.5×
  63. 63ChillánÑuble, Chile
    761.5×
  64. 63McKeesportPennsylvania, United States
    761.5×
  65. 65XonacatlánMéxico, Mexico
    761.5×
  66. 65PittsburghPennsylvania, United States
    761.5×
  67. 67ConcepciónBiobio, Chile
    761.5×
  68. 68WestervilleOhio, United States
    751.5×
  69. 69LinaresMaule Region, Chile
    751.5×
  70. 70WarrenOhio, United States
    751.5×
  71. 71BakuBaki, Azerbaijan
    741.4×
  72. 71Villa Poeta José Gálvez BarrenecheaLima region, Peru
    741.4×
  73. 71YoungstownOhio, United States
    741.4×
  74. 74Alto HospicioTarapacá, Chile
    741.4×
  75. 75WilkinsburgPennsylvania, United States
    741.4×
  76. 76San Pedro de la PazBiobio, Chile
    741.4×
  77. 77IyoEhime, Japan
    731.4×
  78. 78Ang Mo Kio New TownSingapore
    731.4×
  79. 79HelenaMontana, United States
    721.4×
  80. 80DaytonOhio, United States
    721.4×
  81. 81San Francisco TlalcilalcalpanMéxico, Mexico
    721.4×
  82. 82TocopillaAntofagasta, Chile
    721.4×
  83. 82EdmontonAlberta, Canada
    721.4×
  84. 84TolucaMéxico, Mexico
    721.3×
  85. 84Victoria de DurangoDurango, Mexico
    721.3×
  86. 86DublinOhio, United States
    711.3×
  87. 87ShenyangLiaoning, China
    711.3×
  88. 88Los ÁngelesBiobio, Chile
    711.3×
  89. 88CopiapóAtacama, Chile
    711.3×
  90. 90Puerto AysénAysén, Chile
    711.3×
  91. 91CalamaAntofagasta, Chile
    701.3×
  92. 92San Mateo AtencoMéxico, Mexico
    701.3×
  93. 92GuadalajaraJalisco, Mexico
    701.3×
  94. 94AlgiersAlgiers, Algeria
    701.3×
  95. 94SarajevoFederation of B&H, Bosnia and Herzegovina
    701.3×
  96. 96Phra PradaengSamut Prakan, Thailand
    691.3×
  97. 97HollandMichigan, United States
    691.2×
  98. 97San Salvador TizatlalliMéxico, Mexico
    691.2×
  99. 99Bang Bo DistrictSamut Prakan, Thailand
    691.2×
  100. 99AricaArica y Parinacota Region, Chile
    691.2×
  101. 101IndianapolisIndiana, United States
    681.2×
  102. 102AcharnésAttica, Greece
    681.2×
  103. 102DelhiDelhi, India
    681.2×
  104. 104Ciudad JuárezChihuahua, Mexico
    681.2×
  105. 105Ciudad ApodacaNuevo León, Mexico
    671.2×
  106. 106TexarkanaTexas, United States
    671.2×
  107. 107YpsilantiMichigan, United States
    671.2×
  108. 108Wan ChaiWan Chai, Hong Kong
    671.2×
  109. 108MiddletownOhio, United States
    671.2×
  110. 108JohnstownPennsylvania, United States
    671.2×
  111. 111AsprópyrgosAttica, Greece
    661.2×
  112. 111Santa Cruz de TenerifeCanary Islands, Spain
    661.2×
  113. 111KalamazooMichigan, United States
    661.2×
  114. 114West MemphisArkansas, United States
    661.1×
  115. 114JeffersonvilleIndiana, United States
    661.1×
  116. 114ShreveportLouisiana, United States
    661.1×
  117. 114RaleighNorth Carolina, United States
    661.1×
  118. 114Weirton HeightsWest Virginia, United States
    661.1×
  119. 119AndersonIndiana, United States
    661.1×
  120. 120NorwoodOhio, United States
    661.1×
  121. 120MedinaOhio, United States
    661.1×
  122. 122NagaiYamagata, Japan
    651.1×
  123. 122JeffersontownKentucky, United States
    651.1×
  124. 122Winston-SalemNorth Carolina, United States
    651.1×
  125. 125BangkokBangkok, Thailand
    651.1×
  126. 125GreensboroNorth Carolina, United States
    651.1×
  127. 127Dhakalow-cost sensorsDhaka Division, Bangladesh
    651.1×
  128. 127Nakhon PathomNakhon Pathom, Thailand
    651.1×
  129. 127LotaBiobio, Chile
    651.1×
  130. 130LebanonOhio, United States
    651.1×
  131. 130AkronOhio, United States
    651.1×
  132. 132Khlong LuangPathum Thani, Thailand
    641.1×
  133. 132TakasakiGunma, Japan
    641.1×
  134. 132SliemaTas-Sliema, Malta
    641.1×
  135. 135MasonOhio, United States
    641.1×
  136. 135DearbornMichigan, United States
    641.1×
  137. 135ClevelandOhio, United States
    641.1×
  138. 138LouisvilleKentucky, United States
    641.1×
  139. 138Saint MatthewsKentucky, United States
    641.1×
  140. 138CincinnatiOhio, United States
    641.1×
  141. 141Samut PrakanSamut Prakan, Thailand
    641.1×
  142. 142AthensAttica, Greece
    631.1×
  143. 142Ulu BedokSingapore
    631.1×
  144. 142Queenstown Estatelow-cost sensorsSingapore
    631.1×
  145. 142SalamancaGuanajuato, Mexico
    631.1×
  146. 142WheelingWest Virginia, United States
    631.1×
  147. 147ElkhartIndiana, United States
    631.0×
  148. 148GahannaOhio, United States
    631.0×
  149. 149ThessaloníkiCentral Macedonia, Greece
    631.0×
  150. 149LansingMichigan, United States
    631.0×
  151. 149BrawleyCalifornia, United States
    631.0×
  152. 152South BendIndiana, United States
    631.0×
  153. 153ClemmonsNorth Carolina, United States
    631.0×
  154. 153Los AngelesCalifornia, United States
    631.0×
  155. 153WindsorOntario, Canada
    631.0×
  156. 156CharlottesvilleVirginia, United States
    621.0×
  157. 157BitolaBitola, North Macedonia
    621.0×
  158. 158TopekaKansas, United States
    621.0×
  159. 158AltamontOregon, United States
    621.0×
  160. 158BadgerAlaska, United States
    621.0×
  161. 161Mueang NonthaburiNonthaburi, Thailand
    621.0×
  162. 161FishersIndiana, United States
    621.0×
  163. 163ImabariEhime, Japan
    621.0×
  164. 163Little RockArkansas, United States
    621.0×
  165. 163AltoonaPennsylvania, United States
    621.0×
  166. 166ConakryConakry, Guinea
    611.0×
  167. 166New AlbanyIndiana, United States
    611.0×
  168. 166ToledoOhio, United States
    611.0×
  169. 169Fort ThomasKentucky, United States
    611.0×
  170. 169FayettevilleNorth Carolina, United States
    611.0×
  171. 169KokomoIndiana, United States
    611.0×
  172. 169LafayetteIndiana, United States
    611.0×
  173. 169DetroitMichigan, United States
    611.0×
  174. 174NiihamaEhime, Japan
    611.0×
  175. 174MatsuyamaEhime, Japan
    611.0×
  176. 174Valley StationKentucky, United States
    611.0×
  177. 177MorrisvilleNorth Carolina, United States
    611.0×
  178. 177RoanokeVirginia, United States
    611.0×
  179. 177LimaOhio, United States
    611.0×
  180. 177HermitagePennsylvania, United States
    611.0×
  181. 181ColomboWestern Province, Sri Lanka
    611.0×
  182. 181MálagaAndalusia, Spain
    611.0×
  183. 183Samut SakhonSamut Sakhon, Thailand
    610.9×
  184. 183East RidgeTennessee, United States
    610.9×
  185. 183Bay CityMichigan, United States
    610.9×
  186. 186Ferry PassFlorida, United States
    600.9×
  187. 187Bang KapiBangkok, Thailand
    600.9×
  188. 187SaijōEhime, Japan
    600.9×
  189. 189FujinomiyaShizuoka, Japan
    600.9×
  190. 189HattiesburgMississippi, United States
    600.9×
  191. 189SaginawTexas, United States
    600.9×
  192. 189Lincoln ParkMichigan, United States
    600.9×
  193. 189Chula VistaCalifornia, United States
    600.9×
  194. 189BarrieOntario, Canada
    600.9×
  195. 195LublinLublin, Poland
    600.9×
  196. 195KasaokaOkayama, Japan
    600.9×
  197. 195AshlandKentucky, United States
    600.9×
  198. 195Calumet CityIllinois, United States
    600.9×
  199. 195BizenOkayama, Japan
    600.9×
  200. 200MiharaHiroshima, Japan
    600.9×

Top 200 of 1,883 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 2, 2023, smogrank.com/history/2023-08-02 (accessed 2 Oct 2026).

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