SmogRank / History / July 18, 2023

Most polluted cities on July 18, 2023

1,380 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 18, 2023. All episodes.

← Piedras Negras 986.0 µg/m³ 900 µg/m³15 WHO 24-hour guideline
Every city ranked for July 18, 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. 2OsornoLos Lagos Region, Chile
    43919.7×
  3. 3San CarlosÑuble, Chile
    24511.3×
  4. 4HualpénBiobio, Chile
    23210.5×
  5. 5Puerto VarasLos Lagos Region, Chile
    22710.1×
  6. 6NacimientoBiobio, Chile
    22710.1×
  7. 7La UniónLos Ríos Region, Chile
    1957.9×
  8. 8CoyhaiqueAysén, Chile
    1937.7×
  9. 9ChillánÑuble, Chile
    1897.4×
  10. 10Los ÁngelesBiobio, Chile
    1877.1×
  11. 11DushanbeDushanbe, Tajikistan
    1857.0×
  12. 12LinaresMaule Region, Chile
    1846.9×
  13. 13TalcahuanoBiobio, Chile
    1806.5×
  14. 14Puerto MonttLos Lagos Region, Chile
    1806.4×
  15. 15RancaguaO'Higgins Region, Chile
    1776.2×
  16. 16TalaganteSantiago Metropolitan, Chile
    1766.1×
  17. 17RengoO'Higgins Region, Chile
    1766.1×
  18. 18SantiagoSantiago Metropolitan, Chile
    1756.0×
  19. 19HualquiBiobio, Chile
    1695.4×
  20. 20TalcaMaule Region, Chile
    1685.3×
  21. 21CuricóMaule Region, Chile
    1665.1×
  22. 22TemucoAraucania, Chile
    1634.8×
  23. 23Puente AltoSantiago Metropolitan, Chile
    1554.1×
  24. 24ValdiviaLos Ríos Region, Chile
    1544.0×
  25. 25Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1533.9×
  26. 26San Pedro de la PazBiobio, Chile
    1533.9×
  27. 27MaconGeorgia, United States
    1523.8×
  28. 28Warner RobinsGeorgia, United States
    1523.8×
  29. 29McDonoughGeorgia, United States
    1513.7×
  30. 30CuranilahueBiobio, Chile
    1503.7×
  31. 31CoronelBiobio, Chile
    1493.7×
  32. 32SpartanburgSouth Carolina, United States
    1383.4×
  33. 33GainesvilleGeorgia, United States
    1373.4×
  34. 34AthensGeorgia, United States
    1363.3×
  35. 35CauquenesMaule Region, Chile
    1363.3×
  36. 36Candler-McAfeeGeorgia, United States
    1343.3×
  37. 37Winston-SalemNorth Carolina, United States
    1343.3×
  38. 38FayettevilleNorth Carolina, United States
    1323.2×
  39. 39QuillotaValparaiso, Chile
    1303.2×
  40. 39ChiguayanteBiobio, Chile
    1303.2×
  41. 41Puerto AysénAysén, Chile
    1293.1×
  42. 42AlbanyGeorgia, United States
    1293.1×
  43. 42LawrencevilleGeorgia, United States
    1293.1×
  44. 44ConcepciónBiobio, Chile
    1283.1×
  45. 45GreenvilleSouth Carolina, United States
    1283.1×
  46. 46CharlotteNorth Carolina, United States
    1263.1×
  47. 47RaleighNorth Carolina, United States
    1263.0×
  48. 48ClemmonsNorth Carolina, United States
    1263.0×
  49. 49Fort McMurrayAlberta, Canada
    1243.0×
  50. 50MorrisvilleNorth Carolina, United States
    1233.0×
  51. 51AtlantaGeorgia, United States
    1212.9×
  52. 52HanoiHanoi, Vietnam
    1202.9×
  53. 53HickoryNorth Carolina, United States
    1192.9×
  54. 53LexingtonNorth Carolina, United States
    1192.9×
  55. 55GreenvilleNorth Carolina, United States
    1192.9×
  56. 56BurlingtonVermont, United States
    1172.8×
  57. 57KnoxvilleTennessee, United States
    1162.8×
  58. 58Lahorelow-cost sensorsPunjab, Pakistan
    1152.7×
  59. 59ClaytonNorth Carolina, United States
    1152.7×
  60. 60GreensboroNorth Carolina, United States
    1142.7×
  61. 61RutlandVermont, United States
    1112.6×
  62. 62Phenix CityAlabama, United States
    1112.6×
  63. 63Viña del MarValparaiso, Chile
    1102.6×
  64. 64LaconiaNew Hampshire, United States
    1102.6×
  65. 65TlaquepaqueJalisco, Mexico
    1082.6×
  66. 66Islamabadlow-cost sensorsIslamabad, Pakistan
    1082.5×
  67. 66Saint AndrewsSouth Carolina, United States
    1082.5×
  68. 68ConcónValparaiso, Chile
    1072.5×
  69. 68MaryvilleTennessee, United States
    1072.5×
  70. 70FlorenceSouth Carolina, United States
    1062.5×
  71. 71ToméBiobio, Chile
    1062.5×
  72. 72East RidgeTennessee, United States
    1052.5×
  73. 73PittsfieldMassachusetts, United States
    1052.5×
  74. 74DurhamNorth Carolina, United States
    1042.5×
  75. 75Dhakalow-cost sensorsDhaka Division, Bangladesh
    1042.4×
  76. 76ValdostaGeorgia, United States
    1032.4×
  77. 77DelhiDelhi, India
    1032.4×
  78. 78QuinteroValparaiso, Chile
    1032.4×
  79. 79ChattanoogaTennessee, United States
    1022.4×
  80. 80AlbanyNew York, United States
    992.3×
  81. 81Addis AbabaAddis Ababa, Ethiopia
    992.3×
  82. 82Santa Anita - Los FicusLima region, Peru
    992.3×
  83. 83AshevilleNorth Carolina, United States
    982.3×
  84. 84L'Ancienne-LoretteQuebec, Canada
    982.3×
  85. 85SarajevoFederation of B&H, Bosnia and Herzegovina
    962.2×
  86. 86GranbyQuebec, Canada
    962.2×
  87. 87NewarkDelaware, United States
    962.2×
  88. 88CoquimboCoquimbo Region, Chile
    962.2×
  89. 89ShenyangLiaoning, China
    952.2×
  90. 89La SerenaCoquimbo Region, Chile
    952.2×
  91. 89EdgewoodMaryland, United States
    952.2×
  92. 92SyracuseNew York, United States
    942.1×
  93. 93RochesterNew York, United States
    942.1×
  94. 94DrummondvilleQuebec, Canada
    932.1×
  95. 95BrossardQuebec, Canada
    932.1×
  96. 95SaguenayQuebec, Canada
    932.1×
  97. 97Şabāḩ as SālimMubārak al Kabīr, Kuwait
    932.1×
  98. 97KingstonOntario, Canada
    932.1×
  99. 99LotaBiobio, Chile
    932.1×
  100. 100GreenfieldMassachusetts, United States
    922.1×
  101. 101State CollegePennsylvania, United States
    922.1×
  102. 102BeijingBeijing, China
    912.1×
  103. 102QuébecQuebec, Canada
    912.1×
  104. 104KeeneNew Hampshire, United States
    912.0×
  105. 104UticaNew York, United States
    912.0×
  106. 106PristinaPristina, Kosovo
    902.0×
  107. 106BirminghamAlabama, United States
    902.0×
  108. 108AltoonaPennsylvania, United States
    902.0×
  109. 108SherbrookeQuebec, Canada
    902.0×
  110. 110Rose HillVirginia, United States
    902.0×
  111. 111MontréalQuebec, Canada
    892.0×
  112. 112CuencaCastille-La Mancha, Spain
    892.0×
  113. 112HarrisburgPennsylvania, United States
    892.0×
  114. 114SalorTashkent Region, Uzbekistan
    881.9×
  115. 115MostaIl-Mosta, Malta
    881.9×
  116. 115MóstolesMadrid, Spain
    881.9×
  117. 117HuntsvilleAlabama, United States
    881.9×
  118. 117BrunswickGeorgia, United States
    881.9×
  119. 119CatañoCataño, Puerto Rico
    881.9×
  120. 119KingsportTennessee, United States
    881.9×
  121. 119PortlandMaine, United States
    881.9×
  122. 119NorristownPennsylvania, United States
    881.9×
  123. 123BaltimoreMaryland, United States
    871.9×
  124. 123CheektowagaNew York, United States
    871.9×
  125. 125Karachilow-cost sensorsSindh, Pakistan
    871.9×
  126. 125HueytownAlabama, United States
    871.9×
  127. 127ShawiniganQuebec, Canada
    871.9×
  128. 128SpringfieldVirginia, United States
    861.9×
  129. 128BuffaloNew York, United States
    861.9×
  130. 130PalmaBalearic Islands, Spain
    861.9×
  131. 130Lexingtonlow-cost sensorsMassachusetts, United States
    861.9×
  132. 132ChennaiTamil Nadu, India
    861.9×
  133. 133EdmundstonNew Brunswick, Canada
    851.8×
  134. 134AlgiersAlgiers, Algeria
    851.8×
  135. 135ScrantonPennsylvania, United States
    851.8×
  136. 136Trois-RivièresQuebec, Canada
    851.8×
  137. 137WilmingtonDelaware, United States
    851.8×
  138. 137Hunt ValleyMaryland, United States
    851.8×
  139. 139SliemaTas-Sliema, Malta
    841.8×
  140. 139CarlislePennsylvania, United States
    841.8×
  141. 139Saint-Jean-sur-RichelieuQuebec, Canada
    841.8×
  142. 142BamakoBamako, Mali
    841.8×
  143. 142PatersonNew Jersey, United States
    841.8×
  144. 144AsprópyrgosAttica, Greece
    841.8×
  145. 144AugustaGeorgia, United States
    841.8×
  146. 144PhiladelphiaPennsylvania, United States
    841.8×
  147. 147ScaggsvilleMaryland, United States
    841.8×
  148. 147YorkPennsylvania, United States
    841.8×
  149. 149SavannahGeorgia, United States
    841.8×
  150. 149PittsburghPennsylvania, United States
    841.8×
  151. 151CornwallOntario, Canada
    831.8×
  152. 152CharlottesvilleVirginia, United States
    831.8×
  153. 152LancasterPennsylvania, United States
    831.8×
  154. 154WarrenOhio, United States
    831.8×
  155. 155LebanonPennsylvania, United States
    831.7×
  156. 156NewburghNew York, United States
    831.7×
  157. 156BensalemPennsylvania, United States
    831.7×
  158. 158BethlehemPennsylvania, United States
    821.7×
  159. 159MexicaliBaja California, Mexico
    821.7×
  160. 160New CityNew York, United States
    821.7×
  161. 161EdmontonAlberta, Canada
    821.7×
  162. 162Ciudad ApodacaNuevo León, Mexico
    821.7×
  163. 162St. CatharinesOntario, Canada
    821.7×
  164. 164TrussvilleAlabama, United States
    811.7×
  165. 164ElktonMaryland, United States
    811.7×
  166. 166CholulaPuebla, Mexico
    811.7×
  167. 167BrandonManitoba, Canada
    811.7×
  168. 168KenmoreNew York, United States
    811.7×
  169. 169Terre HauteIndiana, United States
    801.6×
  170. 169CantonOhio, United States
    801.6×
  171. 171XonacatlánMéxico, Mexico
    801.6×
  172. 171AntofagastaAntofagasta, Chile
    801.6×
  173. 171WashingtonDistrict of Columbia, United States
    801.6×
  174. 174LimaLima Province, Peru
    801.6×
  175. 174PennsaukenNew Jersey, United States
    801.6×
  176. 174West MifflinPennsylvania, United States
    801.6×
  177. 177WilkinsburgPennsylvania, United States
    801.6×
  178. 177Rivière-des-Prairies–Pointe-aux-TremblesQuebec, Canada
    801.6×
  179. 179New BrunswickNew Jersey, United States
    791.6×
  180. 179TrentonNew Jersey, United States
    791.6×
  181. 181South LaurelMaryland, United States
    791.6×
  182. 181AllentownPennsylvania, United States
    791.6×
  183. 183La Línea de la ConcepciónAndalusia, Spain
    791.6×
  184. 183ElizabethNew Jersey, United States
    791.6×
  185. 183YoungstownOhio, United States
    791.6×
  186. 186SpringdaleArkansas, United States
    781.6×
  187. 186Prince AlbertSaskatchewan, Canada
    781.6×
  188. 188Alto HospicioTarapacá, Chile
    781.6×
  189. 188Ferry PassFlorida, United States
    781.6×
  190. 188Roanoke RapidsNorth Carolina, United States
    781.6×
  191. 188ChesterPennsylvania, United States
    781.6×
  192. 192AricaArica y Parinacota Region, Chile
    781.6×
  193. 192Ponte Vedra BeachFlorida, United States
    781.6×
  194. 192LimaOhio, United States
    781.6×
  195. 195EwingNew Jersey, United States
    781.6×
  196. 195ReadingPennsylvania, United States
    781.6×
  197. 197Weirton HeightsWest Virginia, United States
    771.6×
  198. 198Ciudad Benito JuárezNuevo León, Mexico
    771.5×
  199. 198McKeesportPennsylvania, United States
    771.5×
  200. 200TrnavaTrnava Region, Slovakia
    771.5×

Top 200 of 1,380 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 18, 2023, smogrank.com/history/2023-07-18 (accessed 2 Oct 2026).

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