SmogRank / History / July 27, 2023

Most polluted cities on July 27, 2023

1,251 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 27, 2023. All episodes.

← Piedras Negras 986.0 µg/m³ 900 µg/m³15 WHO 24-hour guideline
Every city ranked for July 27, 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. 2CoyhaiqueAysén, Chile
    2058.7×
  3. 3NacimientoBiobio, Chile
    1725.7×
  4. 4OsornoLos Lagos Region, Chile
    1675.2×
  5. 5JakartaJakarta, Indonesia
    1644.9×
  6. 5San CarlosÑuble, Chile
    1644.9×
  7. 7TemucoAraucania, Chile
    1634.9×
  8. 8Los ÁngelesBiobio, Chile
    1614.6×
  9. 9CoronelBiobio, Chile
    1584.4×
  10. 10ChillánÑuble, Chile
    1574.2×
  11. 11ValdiviaLos Ríos Region, Chile
    1564.2×
  12. 12LinaresMaule Region, Chile
    1523.8×
  13. 13Puerto AysénAysén, Chile
    1503.7×
  14. 14ToméBiobio, Chile
    1493.7×
  15. 15RancaguaO'Higgins Region, Chile
    1483.6×
  16. 16La UniónLos Ríos Region, Chile
    1453.6×
  17. 17Puerto VarasLos Lagos Region, Chile
    1403.4×
  18. 18CauquenesMaule Region, Chile
    1373.4×
  19. 19HualquiBiobio, Chile
    1363.3×
  20. 20SantiagoSantiago Metropolitan, Chile
    1333.2×
  21. 20Puerto MonttLos Lagos Region, Chile
    1333.2×
  22. 22TalcahuanoBiobio, Chile
    1293.1×
  23. 23Puente AltoSantiago Metropolitan, Chile
    1283.1×
  24. 24BendOregon, United States
    1243.0×
  25. 25TalaganteSantiago Metropolitan, Chile
    1222.9×
  26. 26San Mateo AtencoMéxico, Mexico
    1212.9×
  27. 27RengoO'Higgins Region, Chile
    1182.8×
  28. 28ChiguayanteBiobio, Chile
    1142.7×
  29. 29DushanbeDushanbe, Tajikistan
    1132.7×
  30. 29TalcaMaule Region, Chile
    1132.7×
  31. 31ConcepciónBiobio, Chile
    1122.7×
  32. 32QuillotaValparaiso, Chile
    1112.6×
  33. 33MexicaliBaja California, Mexico
    1102.6×
  34. 34CuricóMaule Region, Chile
    1092.6×
  35. 35CuranilahueBiobio, Chile
    1022.4×
  36. 36Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1012.4×
  37. 37Ciudad ApodacaNuevo León, Mexico
    1002.4×
  38. 38Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    992.3×
  39. 39DelhiDelhi, India
    942.2×
  40. 40SalorTashkent Region, Uzbekistan
    942.2×
  41. 41Dhakalow-cost sensorsDhaka Division, Bangladesh
    932.1×
  42. 42BeijingBeijing, China
    912.1×
  43. 43QuinteroValparaiso, Chile
    912.0×
  44. 44HanoiHanoi, Vietnam
    902.0×
  45. 45Lahorelow-cost sensorsPunjab, Pakistan
    871.9×
  46. 46Santa Cruz de TenerifeCanary Islands, Spain
    871.9×
  47. 46San Pedro de la PazBiobio, Chile
    871.9×
  48. 48MidwayFlorida, United States
    861.9×
  49. 49XonacatlánMéxico, Mexico
    851.8×
  50. 49EdinburgTexas, United States
    851.8×
  51. 51São PauloSão Paulo, Brazil
    851.8×
  52. 52SherbrookeQuebec, Canada
    851.8×
  53. 53Little RockArkansas, United States
    851.8×
  54. 54Wan ChaiWan Chai, Hong Kong
    841.8×
  55. 55TlaquepaqueJalisco, Mexico
    841.8×
  56. 55HueytownAlabama, United States
    841.8×
  57. 55Corpus ChristiTexas, United States
    841.8×
  58. 58Jardines de la SillaNuevo León, Mexico
    841.8×
  59. 59HoustonTexas, United States
    831.8×
  60. 60LaredoTexas, United States
    831.7×
  61. 60Eagle PassTexas, United States
    831.7×
  62. 62ConcónValparaiso, Chile
    821.7×
  63. 62Ciudad Benito JuárezNuevo León, Mexico
    821.7×
  64. 64Santa CatarinaNuevo León, Mexico
    821.7×
  65. 65BamakoBamako, Mali
    821.7×
  66. 66AustinTexas, United States
    821.7×
  67. 67Ciudad JuárezChihuahua, Mexico
    811.7×
  68. 68Viña del MarValparaiso, Chile
    811.7×
  69. 69BaytownTexas, United States
    811.7×
  70. 70West MemphisArkansas, United States
    801.6×
  71. 71Ang Mo Kio New TownSingapore
    801.6×
  72. 71Ciudad NezahualcoyotlMéxico, Mexico
    801.6×
  73. 71GalvestonTexas, United States
    801.6×
  74. 71Live OakTexas, United States
    801.6×
  75. 75CoquimboCoquimbo Region, Chile
    801.6×
  76. 75MonterreyNuevo León, Mexico
    801.6×
  77. 77Mission BendTexas, United States
    791.6×
  78. 78Missouri CityTexas, United States
    791.6×
  79. 79San Francisco TlalcilalcalpanMéxico, Mexico
    781.6×
  80. 80PristinaPristina, Kosovo
    781.6×
  81. 81Naucalpan de JuárezMéxico, Mexico
    781.6×
  82. 82PasadenaTexas, United States
    771.5×
  83. 83Islamabadlow-cost sensorsIslamabad, Pakistan
    771.5×
  84. 83La PorteTexas, United States
    771.5×
  85. 85Cadereyta JiménezNuevo León, Mexico
    771.5×
  86. 86AntananarivoAnalamanga, Madagascar
    771.5×
  87. 86Lexingtonlow-cost sensorsMassachusetts, United States
    771.5×
  88. 88FishersIndiana, United States
    761.5×
  89. 89LotaBiobio, Chile
    761.5×
  90. 90BirminghamAlabama, United States
    761.5×
  91. 90BeltonTexas, United States
    761.5×
  92. 92La SerenaCoquimbo Region, Chile
    751.5×
  93. 93GuangzhouGuangdong, China
    751.5×
  94. 93San AntonioTexas, United States
    751.5×
  95. 95JasperIndiana, United States
    751.5×
  96. 96ConroeTexas, United States
    741.4×
  97. 96HolbrookNew York, United States
    741.4×
  98. 98MooreOklahoma, United States
    741.4×
  99. 99DallasTexas, United States
    741.4×
  100. 100Ulu BedokSingapore
    741.4×
  101. 101ColumbusIndiana, United States
    731.4×
  102. 101TulsaOklahoma, United States
    731.4×
  103. 101ElizabethNew Jersey, United States
    731.4×
  104. 104San Tung Chung HangIslands, Hong Kong
    731.4×
  105. 104TolucaMéxico, Mexico
    731.4×
  106. 104Mexico CityMexico City, Mexico
    731.4×
  107. 107SpringdaleArkansas, United States
    731.4×
  108. 107Ferry PassFlorida, United States
    731.4×
  109. 107TexarkanaTexas, United States
    731.4×
  110. 110LouisvilleKentucky, United States
    721.4×
  111. 111Fort WorthTexas, United States
    721.4×
  112. 111WestervilleOhio, United States
    721.4×
  113. 113Terre HauteIndiana, United States
    721.4×
  114. 113HattiesburgMississippi, United States
    721.4×
  115. 113Ponca CityOklahoma, United States
    721.4×
  116. 113College StationTexas, United States
    721.4×
  117. 117ShreveportLouisiana, United States
    721.3×
  118. 117JacksonMississippi, United States
    721.3×
  119. 117West MifflinPennsylvania, United States
    721.3×
  120. 120AdaOklahoma, United States
    711.3×
  121. 120SaginawTexas, United States
    711.3×
  122. 122BakuBaki, Azerbaijan
    711.3×
  123. 122SarajevoFederation of B&H, Bosnia and Herzegovina
    711.3×
  124. 124SarniaOntario, Canada
    711.3×
  125. 125San Luis PotosíSan Luis Potosí, Mexico
    711.3×
  126. 125HernandoMississippi, United States
    711.3×
  127. 125Port HuronMichigan, United States
    711.3×
  128. 128JeffersonvilleIndiana, United States
    701.3×
  129. 128SpringfieldOhio, United States
    701.3×
  130. 128AndersonIndiana, United States
    701.3×
  131. 128AltoonaPennsylvania, United States
    701.3×
  132. 132Abujalow-cost sensorsFCT, Nigeria
    701.3×
  133. 132Tepeji del Río de OcampoHidalgo, Mexico
    701.3×
  134. 132CelayaGuanajuato, Mexico
    701.3×
  135. 135EvansvilleIndiana, United States
    701.3×
  136. 135JeffersontownKentucky, United States
    701.3×
  137. 137ChennaiTamil Nadu, India
    701.3×
  138. 137Bang Bo DistrictSamut Prakan, Thailand
    701.3×
  139. 137GainesvilleGeorgia, United States
    701.3×
  140. 137Saint JosephMissouri, United States
    701.3×
  141. 137GulfportMississippi, United States
    701.3×
  142. 137DentonTexas, United States
    701.3×
  143. 143AntofagastaAntofagasta, Chile
    701.3×
  144. 143EdmondOklahoma, United States
    701.3×
  145. 145Queenstown Estatelow-cost sensorsSingapore
    691.3×
  146. 145AricaArica y Parinacota Region, Chile
    691.3×
  147. 147East Saint LouisIllinois, United States
    691.3×
  148. 147IndianapolisIndiana, United States
    691.3×
  149. 147OlatheKansas, United States
    691.3×
  150. 147Los AngelesCalifornia, United States
    691.3×
  151. 151LebanonOhio, United States
    691.2×
  152. 151CorsicanaTexas, United States
    691.2×
  153. 151KokomoIndiana, United States
    691.2×
  154. 151FairbanksAlaska, United States
    691.2×
  155. 151San Salvador TizatlalliMéxico, Mexico
    691.2×
  156. 156PrichardAlabama, United States
    691.2×
  157. 156JacksonTennessee, United States
    691.2×
  158. 158MaconGeorgia, United States
    681.2×
  159. 158McAlesterOklahoma, United States
    681.2×
  160. 158BartlettTennessee, United States
    681.2×
  161. 158PortlandMaine, United States
    681.2×
  162. 162MasonOhio, United States
    681.2×
  163. 162Oak LawnIllinois, United States
    681.2×
  164. 162Candler-McAfeeGeorgia, United States
    681.2×
  165. 165NorwoodOhio, United States
    681.2×
  166. 165LawtonOklahoma, United States
    681.2×
  167. 165OdessaTexas, United States
    681.2×
  168. 168Tuen MunTuen Mun, Hong Kong
    681.2×
  169. 168McKeesportPennsylvania, United States
    681.2×
  170. 168LondonOntario, Canada
    681.2×
  171. 171NewarkDelaware, United States
    671.2×
  172. 171OwensboroKentucky, United States
    671.2×
  173. 171Valley StationKentucky, United States
    671.2×
  174. 174Alto HospicioTarapacá, Chile
    671.2×
  175. 174TrussvilleAlabama, United States
    671.2×
  176. 174Kansas CityKansas, United States
    671.2×
  177. 174KnoxvilleTennessee, United States
    671.2×
  178. 174LafayetteIndiana, United States
    671.2×
  179. 174RedmondOregon, United States
    671.2×
  180. 180FanlingNorth District, Hong Kong
    671.2×
  181. 180GuadalajaraJalisco, Mexico
    671.2×
  182. 180CincinnatiOhio, United States
    671.2×
  183. 180SpartanburgSouth Carolina, United States
    671.2×
  184. 180HollandMichigan, United States
    671.2×
  185. 185MontgomeryAlabama, United States
    671.2×
  186. 185PascagoulaMississippi, United States
    671.2×
  187. 185Winston-SalemNorth Carolina, United States
    671.2×
  188. 185DaytonOhio, United States
    671.2×
  189. 185JenksOklahoma, United States
    671.2×
  190. 190Saint MatthewsKentucky, United States
    671.2×
  191. 190BensalemPennsylvania, United States
    671.2×
  192. 190JohnstownPennsylvania, United States
    671.2×
  193. 190L'Ancienne-LoretteQuebec, Canada
    671.2×
  194. 194TocopillaAntofagasta, Chile
    661.2×
  195. 194PaducahKentucky, United States
    661.2×
  196. 194Grand RapidsMichigan, United States
    661.2×
  197. 194EdmundstonNew Brunswick, Canada
    661.2×
  198. 198Tin Shui WaiYuen Long, Hong Kong
    661.2×
  199. 198Mong KokYau Tsim Mong District, Hong Kong
    661.2×
  200. 198GreensboroNorth Carolina, United States
    661.2×

Top 200 of 1,251 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 27, 2023, smogrank.com/history/2023-07-27 (accessed 2 Oct 2026).

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