SmogRank / History / July 17, 2023

Most polluted cities on July 17, 2023

1,204 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 17, 2023. All episodes.

← Piedras Negras 986.0 µg/m³ 900 µg/m³15 WHO 24-hour guideline
Every city ranked for July 17, 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. 2Puerto MonttLos Lagos Region, Chile
    2249.9×
  3. 3NacimientoBiobio, Chile
    2139.2×
  4. 4RancaguaO'Higgins Region, Chile
    2048.6×
  5. 5OsornoLos Lagos Region, Chile
    1988.1×
  6. 5HualpénBiobio, Chile
    1988.1×
  7. 7San CarlosÑuble, Chile
    1836.7×
  8. 8Puerto VarasLos Lagos Region, Chile
    1826.6×
  9. 9CoyhaiqueAysén, Chile
    1786.2×
  10. 10DushanbeDushanbe, Tajikistan
    1725.7×
  11. 11TalaganteSantiago Metropolitan, Chile
    1715.6×
  12. 12LinaresMaule Region, Chile
    1715.6×
  13. 13La UniónLos Ríos Region, Chile
    1705.5×
  14. 14Lahorelow-cost sensorsPunjab, Pakistan
    1695.4×
  15. 15SantiagoSantiago Metropolitan, Chile
    1655.0×
  16. 16ChillánÑuble, Chile
    1634.8×
  17. 17RengoO'Higgins Region, Chile
    1614.7×
  18. 18HualquiBiobio, Chile
    1574.3×
  19. 19WarrenOhio, United States
    1574.2×
  20. 20TalcahuanoBiobio, Chile
    1574.2×
  21. 21CuricóMaule Region, Chile
    1564.2×
  22. 22MostaIl-Mosta, Malta
    1554.1×
  23. 23ClevelandOhio, United States
    1554.1×
  24. 24CantonOhio, United States
    1554.1×
  25. 25MedinaOhio, United States
    1544.0×
  26. 26Puerto AysénAysén, Chile
    1544.0×
  27. 27WestervilleOhio, United States
    1543.9×
  28. 28Shaker HeightsOhio, United States
    1533.9×
  29. 29EriePennsylvania, United States
    1533.9×
  30. 30TemucoAraucania, Chile
    1533.9×
  31. 31YoungstownOhio, United States
    1533.9×
  32. 32AkronOhio, United States
    1513.7×
  33. 33SpringfieldOhio, United States
    1453.6×
  34. 34East RidgeTennessee, United States
    1433.5×
  35. 35Winston-SalemNorth Carolina, United States
    1423.5×
  36. 36HanoiHanoi, Vietnam
    1423.5×
  37. 37CoronelBiobio, Chile
    1413.5×
  38. 38KnoxvilleTennessee, United States
    1413.4×
  39. 38DublinOhio, United States
    1413.4×
  40. 40Rapid CitySouth Dakota, United States
    1413.4×
  41. 41Los ÁngelesBiobio, Chile
    1403.4×
  42. 42TalcaMaule Region, Chile
    1373.4×
  43. 43HermitagePennsylvania, United States
    1373.3×
  44. 44DaytonOhio, United States
    1353.3×
  45. 45ChattanoogaTennessee, United States
    1353.3×
  46. 45RochesterNew York, United States
    1353.3×
  47. 47HuntsvilleAlabama, United States
    1333.2×
  48. 48PainesvilleOhio, United States
    1333.2×
  49. 49QuillotaValparaiso, Chile
    1323.2×
  50. 49LimaOhio, United States
    1323.2×
  51. 51AndersonIndiana, United States
    1313.2×
  52. 51BuffaloNew York, United States
    1313.2×
  53. 53TlaquepaqueJalisco, Mexico
    1313.2×
  54. 54CheektowagaNew York, United States
    1303.2×
  55. 55Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1283.1×
  56. 56ClemmonsNorth Carolina, United States
    1263.0×
  57. 56EdmontonAlberta, Canada
    1263.0×
  58. 58CauquenesMaule Region, Chile
    1263.0×
  59. 58GahannaOhio, United States
    1263.0×
  60. 60PittsburghPennsylvania, United States
    1263.0×
  61. 61GainesvilleGeorgia, United States
    1233.0×
  62. 62SteubenvilleOhio, United States
    1212.9×
  63. 63BillingsMontana, United States
    1212.9×
  64. 64GilletteWyoming, United States
    1212.9×
  65. 65GreenvilleSouth Carolina, United States
    1202.9×
  66. 66KenmoreNew York, United States
    1202.9×
  67. 67BirminghamAlabama, United States
    1182.8×
  68. 68CalgaryAlberta, Canada
    1172.8×
  69. 69SyracuseNew York, United States
    1172.8×
  70. 70LawrencevilleGeorgia, United States
    1172.8×
  71. 71Puente AltoSantiago Metropolitan, Chile
    1172.8×
  72. 72LouisvilleKentucky, United States
    1172.8×
  73. 72MaryvilleTennessee, United States
    1172.8×
  74. 74RoanokeVirginia, United States
    1162.8×
  75. 75Weirton HeightsWest Virginia, United States
    1152.8×
  76. 76Viña del MarValparaiso, Chile
    1152.7×
  77. 76SpartanburgSouth Carolina, United States
    1152.7×
  78. 78WilkinsburgPennsylvania, United States
    1152.7×
  79. 78Candler-McAfeeGeorgia, United States
    1152.7×
  80. 80HueytownAlabama, United States
    1132.7×
  81. 81St. CatharinesOntario, Canada
    1132.7×
  82. 82MiddletownOhio, United States
    1122.7×
  83. 82CharlottesvilleVirginia, United States
    1122.7×
  84. 84AshlandKentucky, United States
    1112.6×
  85. 85IndianapolisIndiana, United States
    1102.6×
  86. 85CharlotteNorth Carolina, United States
    1102.6×
  87. 87ValdiviaLos Ríos Region, Chile
    1092.6×
  88. 87GreensboroNorth Carolina, United States
    1092.6×
  89. 87GreenfieldMassachusetts, United States
    1092.6×
  90. 87West MifflinPennsylvania, United States
    1092.6×
  91. 91ConcepciónBiobio, Chile
    1082.6×
  92. 92BloomingtonIllinois, United States
    1072.5×
  93. 93São PauloSão Paulo, Brazil
    1072.5×
  94. 93Rose HillVirginia, United States
    1072.5×
  95. 95ToméBiobio, Chile
    1062.5×
  96. 96KeeneNew Hampshire, United States
    1062.5×
  97. 96St. ThomasOntario, Canada
    1062.5×
  98. 98Dhakalow-cost sensorsDhaka Division, Bangladesh
    1052.5×
  99. 98FishersIndiana, United States
    1052.5×
  100. 100KingsportTennessee, United States
    1042.5×
  101. 100LancasterPennsylvania, United States
    1042.5×
  102. 102LexingtonNorth Carolina, United States
    1042.5×
  103. 103LebanonOhio, United States
    1042.4×
  104. 104JeffersontownKentucky, United States
    1032.4×
  105. 104HickoryNorth Carolina, United States
    1032.4×
  106. 106AirdrieAlberta, Canada
    1032.4×
  107. 107PittsfieldMassachusetts, United States
    1032.4×
  108. 107UticaNew York, United States
    1032.4×
  109. 109TrussvilleAlabama, United States
    1022.4×
  110. 110AthensGeorgia, United States
    1022.4×
  111. 110McKeesportPennsylvania, United States
    1022.4×
  112. 112AtlantaGeorgia, United States
    1012.4×
  113. 113San Pedro de la PazBiobio, Chile
    1002.4×
  114. 114JeffersonvilleIndiana, United States
    1002.3×
  115. 115LotaBiobio, Chile
    992.3×
  116. 116PristinaPristina, Kosovo
    992.3×
  117. 116HamiltonOntario, Canada
    992.3×
  118. 118Grande PrairieAlberta, Canada
    992.3×
  119. 119ColumbiaTennessee, United States
    992.3×
  120. 119WheelingWest Virginia, United States
    992.3×
  121. 121Addis AbabaAddis Ababa, Ethiopia
    982.3×
  122. 121ConcónValparaiso, Chile
    982.3×
  123. 121OakvilleOntario, Canada
    982.3×
  124. 124Valley StationKentucky, United States
    982.3×
  125. 125WaterdownOntario, Canada
    982.3×
  126. 126NorwoodOhio, United States
    982.3×
  127. 126SpringfieldVirginia, United States
    982.3×
  128. 128McDonoughGeorgia, United States
    972.3×
  129. 129HaverhillMassachusetts, United States
    972.2×
  130. 130AshevilleNorth Carolina, United States
    972.2×
  131. 131SarajevoFederation of B&H, Bosnia and Herzegovina
    962.2×
  132. 131BethlehemPennsylvania, United States
    962.2×
  133. 133BrantfordOntario, Canada
    962.2×
  134. 134Lexington-FayetteKentucky, United States
    962.2×
  135. 135JakartaJakarta, Indonesia
    962.2×
  136. 135ToledoOhio, United States
    962.2×
  137. 137AlbanyNew York, United States
    962.2×
  138. 137AltoonaPennsylvania, United States
    962.2×
  139. 139RutlandVermont, United States
    952.2×
  140. 140BaltimoreMaryland, United States
    952.2×
  141. 141WashingtonDistrict of Columbia, United States
    942.1×
  142. 142QuinteroValparaiso, Chile
    932.1×
  143. 142CoquimboCoquimbo Region, Chile
    932.1×
  144. 142ElizabethtownKentucky, United States
    932.1×
  145. 145South BendIndiana, United States
    932.1×
  146. 145AllentownPennsylvania, United States
    932.1×
  147. 147Saint MatthewsKentucky, United States
    932.1×
  148. 147KingstonOntario, Canada
    932.1×
  149. 149New CityNew York, United States
    932.1×
  150. 149HarrisburgPennsylvania, United States
    932.1×
  151. 151LowellMassachusetts, United States
    922.1×
  152. 151State CollegePennsylvania, United States
    922.1×
  153. 153CincinnatiOhio, United States
    922.1×
  154. 153YorkPennsylvania, United States
    922.1×
  155. 155DelhiDelhi, India
    922.1×
  156. 155MorrisvilleNorth Carolina, United States
    922.1×
  157. 155BurlingtonVermont, United States
    922.1×
  158. 158North ChicopeeMassachusetts, United States
    912.1×
  159. 159ChiguayanteBiobio, Chile
    912.0×
  160. 160EdgewoodMaryland, United States
    912.0×
  161. 160Medicine HatAlberta, Canada
    912.0×
  162. 162South LaurelMaryland, United States
    902.0×
  163. 163RaleighNorth Carolina, United States
    902.0×
  164. 164Fort ThomasKentucky, United States
    902.0×
  165. 165Karachilow-cost sensorsSindh, Pakistan
    902.0×
  166. 165MiltonOntario, Canada
    902.0×
  167. 165PeterboroughOntario, Canada
    902.0×
  168. 168ScaggsvilleMaryland, United States
    902.0×
  169. 168LebanonPennsylvania, United States
    902.0×
  170. 170BellevilleOntario, Canada
    892.0×
  171. 171SpringfieldMassachusetts, United States
    892.0×
  172. 172JolietIllinois, United States
    892.0×
  173. 173MaconGeorgia, United States
    892.0×
  174. 173NewburghNew York, United States
    892.0×
  175. 173Red DeerAlberta, Canada
    892.0×
  176. 176ChennaiTamil Nadu, India
    881.9×
  177. 176DerryNew Hampshire, United States
    881.9×
  178. 178Calumet CityIllinois, United States
    881.9×
  179. 179NewarkDelaware, United States
    881.9×
  180. 179ChathamOntario, Canada
    881.9×
  181. 181WorcesterMassachusetts, United States
    881.9×
  182. 181TorontoOntario, Canada
    881.9×
  183. 183Hunt ValleyMaryland, United States
    871.9×
  184. 183ReadingPennsylvania, United States
    871.9×
  185. 185LaconiaNew Hampshire, United States
    871.9×
  186. 185ScrantonPennsylvania, United States
    871.9×
  187. 187CookevilleTennessee, United States
    871.9×
  188. 188CarlislePennsylvania, United States
    861.9×
  189. 189DavenportIowa, United States
    861.9×
  190. 189LondonOntario, Canada
    861.9×
  191. 191La SerenaCoquimbo Region, Chile
    861.9×
  192. 191Warner RobinsGeorgia, United States
    861.9×
  193. 193Phenix CityAlabama, United States
    861.8×
  194. 194Islamabadlow-cost sensorsIslamabad, Pakistan
    851.8×
  195. 195ClarksvilleTennessee, United States
    851.8×
  196. 196MississaugaOntario, Canada
    851.8×
  197. 197LimaLima Province, Peru
    851.8×
  198. 197HendersonvilleTennessee, United States
    851.8×
  199. 199MolineIllinois, United States
    841.8×
  200. 200SalorTashkent Region, Uzbekistan
    841.8×

Top 200 of 1,204 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 17, 2023, smogrank.com/history/2023-07-17 (accessed 2 Oct 2026).

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