SmogRank / History / July 24, 2023

Most polluted cities on July 24, 2023

1,323 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 July 24, 2023. All episodes.

← Piedras Negras 986.0 µg/m³ 900 µg/m³15 WHO 24-hour guideline
Every city ranked for July 24, 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. 2JakartaJakarta, Indonesia
    500+36.3×
  3. 3CoyhaiqueAysén, Chile
    1857.0×
  4. 4BendOregon, United States
    1776.1×
  5. 5Puerto VarasLos Lagos Region, Chile
    1756.0×
  6. 6TalcahuanoBiobio, Chile
    1735.8×
  7. 7CuranilahueBiobio, Chile
    1715.6×
  8. 8NacimientoBiobio, Chile
    1655.0×
  9. 9OsornoLos Lagos Region, Chile
    1614.6×
  10. 10RancaguaO'Higgins Region, Chile
    1594.5×
  11. 11LinaresMaule Region, Chile
    1594.5×
  12. 12RedmondOregon, United States
    1584.4×
  13. 13DushanbeDushanbe, Tajikistan
    1564.2×
  14. 14CuricóMaule Region, Chile
    1544.0×
  15. 15TalaganteSantiago Metropolitan, Chile
    1543.9×
  16. 16San Pedro de la PazBiobio, Chile
    1533.9×
  17. 17CoronelBiobio, Chile
    1523.8×
  18. 18TemucoAraucania, Chile
    1523.8×
  19. 19ValdiviaLos Ríos Region, Chile
    1523.8×
  20. 20Puerto MonttLos Lagos Region, Chile
    1513.7×
  21. 21SantiagoSantiago Metropolitan, Chile
    1433.5×
  22. 22TalcaMaule Region, Chile
    1423.5×
  23. 23MadisonWisconsin, United States
    1423.5×
  24. 24WaukeshaWisconsin, United States
    1353.3×
  25. 25RengoO'Higgins Region, Chile
    1323.2×
  26. 26Los ÁngelesBiobio, Chile
    1293.1×
  27. 27Eau ClaireWisconsin, United States
    1283.1×
  28. 28AppletonWisconsin, United States
    1283.1×
  29. 29La UniónLos Ríos Region, Chile
    1212.9×
  30. 30Puerto AysénAysén, Chile
    1192.9×
  31. 31ChillánÑuble, Chile
    1162.8×
  32. 32EdmontonAlberta, Canada
    1162.8×
  33. 33CauquenesMaule Region, Chile
    1162.8×
  34. 34ToméBiobio, Chile
    1152.7×
  35. 35Puente AltoSantiago Metropolitan, Chile
    1132.7×
  36. 36Santa Anita - Los FicusLima region, Peru
    1112.6×
  37. 37CaryIllinois, United States
    1102.6×
  38. 37DuluthMinnesota, United States
    1102.6×
  39. 39Dhakalow-cost sensorsDhaka Division, Bangladesh
    1102.6×
  40. 40Franklin ParkIllinois, United States
    1092.6×
  41. 41ConcepciónBiobio, Chile
    1082.6×
  42. 42Saint CloudMinnesota, United States
    1082.5×
  43. 43San CarlosÑuble, Chile
    1072.5×
  44. 44Green BayWisconsin, United States
    1072.5×
  45. 45Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1062.5×
  46. 46MinneapolisMinnesota, United States
    1052.5×
  47. 47RockfordIllinois, United States
    1052.5×
  48. 47SaskatoonSaskatchewan, Canada
    1052.5×
  49. 49NapervilleIllinois, United States
    1022.4×
  50. 50JolietIllinois, United States
    1012.4×
  51. 51West FargoNorth Dakota, United States
    1012.4×
  52. 52HualquiBiobio, Chile
    1012.4×
  53. 53SuperiorWisconsin, United States
    1002.4×
  54. 54BeijingBeijing, China
    1002.4×
  55. 55MilwaukeeWisconsin, United States
    992.3×
  56. 56South MilwaukeeWisconsin, United States
    992.3×
  57. 57PristinaPristina, Kosovo
    982.3×
  58. 57Des PlainesIllinois, United States
    982.3×
  59. 59Saint PaulMinnesota, United States
    972.3×
  60. 60QuillotaValparaiso, Chile
    972.3×
  61. 61LansingMichigan, United States
    972.2×
  62. 62MostaIl-Mosta, Malta
    962.2×
  63. 63BlaineMinnesota, United States
    942.1×
  64. 64Calumet CityIllinois, United States
    942.1×
  65. 65NaplesCampania, Italy
    902.0×
  66. 66BurnsvilleMinnesota, United States
    902.0×
  67. 67Lahorelow-cost sensorsPunjab, Pakistan
    902.0×
  68. 68Bonita SpringsFlorida, United States
    892.0×
  69. 68NorthbrookIllinois, United States
    892.0×
  70. 68ShakopeeMinnesota, United States
    892.0×
  71. 71Saint MichaelMinnesota, United States
    892.0×
  72. 72KamloopsBritish Columbia, Canada
    881.9×
  73. 73SalorTashkent Region, Uzbekistan
    871.9×
  74. 74MexicaliBaja California, Mexico
    861.9×
  75. 75SliemaTas-Sliema, Malta
    861.9×
  76. 76ReginaSaskatchewan, Canada
    851.8×
  77. 77Fort LauderdaleFlorida, United States
    851.8×
  78. 78CoquimboCoquimbo Region, Chile
    851.8×
  79. 79BeneventoCampania, Italy
    841.8×
  80. 80Red DeerAlberta, Canada
    831.8×
  81. 81Apple ValleyMinnesota, United States
    831.7×
  82. 82AntananarivoAnalamanga, Madagascar
    831.7×
  83. 83SarajevoFederation of B&H, Bosnia and Herzegovina
    821.7×
  84. 84KalamazooMichigan, United States
    821.7×
  85. 85AsprópyrgosAttica, Greece
    821.7×
  86. 86ShenyangLiaoning, China
    821.7×
  87. 86WaterlooIowa, United States
    821.7×
  88. 88PesaroThe Marches, Italy
    811.7×
  89. 88HammondIndiana, United States
    811.7×
  90. 90AnkenyIowa, United States
    811.7×
  91. 91ŻabbarĦaż-Żabbar, Malta
    811.7×
  92. 92La CrosseWisconsin, United States
    801.7×
  93. 93ChicagoIllinois, United States
    801.7×
  94. 94Spišská Nová VesKošice Region, Slovakia
    801.6×
  95. 95South BendIndiana, United States
    791.6×
  96. 96BelmopanCayo District, Belize
    791.6×
  97. 97WatertownSouth Dakota, United States
    791.6×
  98. 98Fort McMurrayAlberta, Canada
    791.6×
  99. 99East ChicagoIndiana, United States
    781.6×
  100. 100VeniceFlorida, United States
    781.6×
  101. 101Ciudad JuárezChihuahua, Mexico
    781.6×
  102. 102QuinteroValparaiso, Chile
    771.6×
  103. 102Des MoinesIowa, United States
    771.6×
  104. 104DelhiDelhi, India
    771.5×
  105. 104SalernoCampania, Italy
    771.5×
  106. 106ZionIllinois, United States
    771.5×
  107. 107AnconaThe Marches, Italy
    771.5×
  108. 107LotaBiobio, Chile
    771.5×
  109. 107ConcónValparaiso, Chile
    771.5×
  110. 110BamakoBamako, Mali
    771.5×
  111. 111LimaLima Province, Peru
    771.5×
  112. 111Grand RapidsMichigan, United States
    771.5×
  113. 113Haskovolow-cost sensorsHaskovo, Bulgaria
    761.5×
  114. 114BrandonManitoba, Canada
    761.5×
  115. 115Abidjanlow-cost sensorsAbidjan Autonomous District, Ivory Coast
    751.5×
  116. 116St. AlbertAlberta, Canada
    751.5×
  117. 117BloomingtonIllinois, United States
    751.5×
  118. 118JenisonMichigan, United States
    741.4×
  119. 119AntofagastaAntofagasta, Chile
    741.4×
  120. 119Coconut CreekFlorida, United States
    741.4×
  121. 121JeddahMecca Region, Saudi Arabia
    741.4×
  122. 122BolzanoTrentino-Alto Adige, Italy
    741.4×
  123. 122DavieFlorida, United States
    741.4×
  124. 124Şabāḩ as SālimMubārak al Kabīr, Kuwait
    741.4×
  125. 124DavenportIowa, United States
    741.4×
  126. 124Iowa CityIowa, United States
    741.4×
  127. 127AricaArica y Parinacota Region, Chile
    731.4×
  128. 127MiamiFlorida, United States
    731.4×
  129. 127HollandMichigan, United States
    731.4×
  130. 130La SerenaCoquimbo Region, Chile
    731.4×
  131. 130ClintonIowa, United States
    731.4×
  132. 132XonacatlánMéxico, Mexico
    731.4×
  133. 132MolineIllinois, United States
    731.4×
  134. 134SpringfieldIllinois, United States
    731.4×
  135. 135HomesteadFlorida, United States
    721.4×
  136. 136Viña del MarValparaiso, Chile
    721.4×
  137. 137AthensAttica, Greece
    721.3×
  138. 137Falconara MarittimaThe Marches, Italy
    721.3×
  139. 137Delray BeachFlorida, United States
    721.3×
  140. 140PrešovPrešov Region, Slovakia
    711.3×
  141. 141Islamabadlow-cost sensorsIslamabad, Pakistan
    711.3×
  142. 141Oak LawnIllinois, United States
    711.3×
  143. 143CopiapóAtacama, Chile
    711.3×
  144. 143ElkhartIndiana, United States
    711.3×
  145. 145ChennaiTamil Nadu, India
    711.3×
  146. 146KošiceKošice Region, Slovakia
    711.3×
  147. 146BratislavaBratislava Region, Slovakia
    711.3×
  148. 146ModugnoApulia, Italy
    711.3×
  149. 146Deerfield BeachFlorida, United States
    711.3×
  150. 150HanoiHanoi, Vietnam
    711.3×
  151. 150TrnavaTrnava Region, Slovakia
    711.3×
  152. 150BrookingsSouth Dakota, United States
    711.3×
  153. 153Palm CityFlorida, United States
    701.3×
  154. 154TocopillaAntofagasta, Chile
    701.3×
  155. 155CapannoriTuscany, Italy
    691.3×
  156. 155West MifflinPennsylvania, United States
    691.3×
  157. 155Sherwood ParkAlberta, Canada
    691.3×
  158. 158AlgiersAlgiers, Algeria
    691.2×
  159. 158MinatitlánVeracruz, Mexico
    691.2×
  160. 160FlorenceTuscany, Italy
    691.2×
  161. 160San Francisco De BorjaLima region, Peru
    691.2×
  162. 162MontemurloTuscany, Italy
    691.2×
  163. 162Belle GladeFlorida, United States
    691.2×
  164. 162RiversideCalifornia, United States
    691.2×
  165. 162CalgaryAlberta, Canada
    691.2×
  166. 166Jurupa ValleyCalifornia, United States
    681.2×
  167. 167GrossetoTuscany, Italy
    681.2×
  168. 168DecaturIllinois, United States
    681.2×
  169. 169WestonFlorida, United States
    681.2×
  170. 170BakuBaki, Azerbaijan
    671.2×
  171. 170Alto HospicioTarapacá, Chile
    671.2×
  172. 172Villa Poeta José Gálvez BarrenecheaLima region, Peru
    671.2×
  173. 173Lagoslow-cost sensorsLagos, Nigeria
    671.2×
  174. 174HumennéPrešov Region, Slovakia
    661.2×
  175. 174PisaTuscany, Italy
    661.2×
  176. 174CasertaCampania, Italy
    661.2×
  177. 174CalamaAntofagasta, Chile
    661.2×
  178. 174SarasotaFlorida, United States
    661.2×
  179. 174FontanaCalifornia, United States
    661.2×
  180. 174FairbanksAlaska, United States
    661.2×
  181. 181Karachilow-cost sensorsSindh, Pakistan
    661.2×
  182. 181MuscatineIowa, United States
    661.2×
  183. 183NitraNitra Region, Slovakia
    661.1×
  184. 183JesiThe Marches, Italy
    661.1×
  185. 183WellingtonFlorida, United States
    661.1×
  186. 183Great FallsMontana, United States
    661.1×
  187. 187PratoTuscany, Italy
    661.1×
  188. 187Swift CurrentSaskatchewan, Canada
    661.1×
  189. 189TolucaMéxico, Mexico
    661.1×
  190. 190AcharnésAttica, Greece
    651.1×
  191. 190Bishkeklow-cost sensorsBishkek, Kyrgyzstan
    651.1×
  192. 190TrentoTrentino-Alto Adige, Italy
    651.1×
  193. 190PoggibonsiTuscany, Italy
    651.1×
  194. 190HelenaMontana, United States
    651.1×
  195. 195Vranov nad TopľouPrešov Region, Slovakia
    651.1×
  196. 196BelgradeCentral Serbia, Serbia
    651.1×
  197. 196AlessandriaPiedmont, Italy
    651.1×
  198. 196Little RockArkansas, United States
    651.1×
  199. 196Los AngelesCalifornia, United States
    651.1×
  200. 200MassaTuscany, Italy
    651.1×

Top 200 of 1,323 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, July 24, 2023, smogrank.com/history/2023-07-24 (accessed 2 Oct 2026).

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