SmogRank / History / May 23, 2023

Most polluted cities on May 23, 2023

1,304 cities ranked by their average PM2.5 over the day; the worst was Coyhaique, Chile, at 138.5 µg/m³. Each city's own local calendar day.

← Coyhaique 138.5 µg/m³ 100 µg/m³15 WHO 24-hour guideline
Every city ranked for May 23, 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. 1CoyhaiqueAysén, Chile
    2149.2×
  2. 2Lahorelow-cost sensorsPunjab, Pakistan
    1745.8×
  3. 3Fort McMurrayAlberta, Canada
    1705.5×
  4. 4AbasoloGuanajuato, Mexico
    1584.4×
  5. 5BaghdadBaghdad, Iraq
    1554.1×
  6. 6Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1453.6×
  7. 7DelhiDelhi, India
    1443.5×
  8. 8SantiagoSantiago Metropolitan, Chile
    1363.3×
  9. 9Dhakalow-cost sensorsDhaka Division, Bangladesh
    1363.3×
  10. 10AntananarivoAnalamanga, Madagascar
    1293.1×
  11. 11HyderabadTelangana, India
    1283.1×
  12. 12HanoiHanoi, Vietnam
    1273.1×
  13. 13Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1253.0×
  14. 14NacimientoBiobio, Chile
    1222.9×
  15. 15Kathmandulow-cost sensorsBagmati Province, Nepal
    1142.7×
  16. 16Puerto AysénAysén, Chile
    1082.6×
  17. 17RengoO'Higgins Region, Chile
    1052.5×
  18. 18KolkataWest Bengal, India
    1052.5×
  19. 19JakartaJakarta, Indonesia
    1042.5×
  20. 20DushanbeDushanbe, Tajikistan
    1032.4×
  21. 21ThorntonColorado, United States
    1022.4×
  22. 22TalaganteSantiago Metropolitan, Chile
    1002.3×
  23. 23KigaliKigali, Rwanda
    992.3×
  24. 24Puente AltoSantiago Metropolitan, Chile
    992.3×
  25. 25SaskatoonSaskatchewan, Canada
    962.2×
  26. 26DenverColorado, United States
    962.2×
  27. 27Ken CarylColorado, United States
    952.2×
  28. 28EdmontonAlberta, Canada
    932.1×
  29. 29Islamabadlow-cost sensorsIslamabad, Pakistan
    932.1×
  30. 30GuadalajaraJalisco, Mexico
    932.1×
  31. 30CelayaGuanajuato, Mexico
    932.1×
  32. 32Tha BoNong Khai, Thailand
    932.1×
  33. 33HualquiBiobio, Chile
    922.1×
  34. 34RancaguaO'Higgins Region, Chile
    922.1×
  35. 35Mexico CityMexico City, Mexico
    892.0×
  36. 36Nong KhaemBangkok, Thailand
    881.9×
  37. 37SulphurLouisiana, United States
    881.9×
  38. 37Prince AlbertSaskatchewan, Canada
    881.9×
  39. 39PristinaPristina, Kosovo
    861.9×
  40. 40OsornoLos Lagos Region, Chile
    861.9×
  41. 41TexarkanaTexas, United States
    851.8×
  42. 42ZapopanJalisco, Mexico
    851.8×
  43. 43Samut SakhonSamut Sakhon, Thailand
    851.8×
  44. 43RabinalBaja Verapaz, Guatemala
    851.8×
  45. 43Guatemala CityGuatemala, Guatemala
    851.8×
  46. 46São PauloSão Paulo, Brazil
    851.8×
  47. 47CuranilahueBiobio, Chile
    841.8×
  48. 48ChennaiTamil Nadu, India
    831.8×
  49. 48TolucaMéxico, Mexico
    831.8×
  50. 50AntofagastaAntofagasta, Chile
    831.8×
  51. 50BaytownTexas, United States
    831.8×
  52. 52BeijingBeijing, China
    831.7×
  53. 53BangkokBangkok, Thailand
    821.7×
  54. 54Rapid CitySouth Dakota, United States
    821.7×
  55. 55HoustonTexas, United States
    821.7×
  56. 56BakuBaki, Azerbaijan
    811.7×
  57. 56PasadenaTexas, United States
    811.7×
  58. 58LongmontColorado, United States
    811.7×
  59. 59Phra PradaengSamut Prakan, Thailand
    811.7×
  60. 60SalamancaGuanajuato, Mexico
    801.6×
  61. 61Bang Bo DistrictSamut Prakan, Thailand
    801.6×
  62. 61La PorteTexas, United States
    801.6×
  63. 63Baton RougeLouisiana, United States
    801.6×
  64. 63BurnsvilleMinnesota, United States
    801.6×
  65. 65Port ArthurTexas, United States
    791.6×
  66. 66Saint PaulMinnesota, United States
    791.6×
  67. 67La UniónLos Ríos Region, Chile
    791.6×
  68. 67West FargoNorth Dakota, United States
    791.6×
  69. 69GuangzhouGuangdong, China
    791.6×
  70. 69Apple ValleyMinnesota, United States
    791.6×
  71. 69MinneapolisMinnesota, United States
    791.6×
  72. 72Addis AbabaAddis Ababa, Ethiopia
    781.6×
  73. 72MeyzieuAuvergne-Rhône-Alpes, France
    781.6×
  74. 72GalvestonTexas, United States
    781.6×
  75. 72RichmondCalifornia, United States
    781.6×
  76. 76ConroeTexas, United States
    781.6×
  77. 77Bang KapiBangkok, Thailand
    781.6×
  78. 77CopiapóAtacama, Chile
    781.6×
  79. 79CoronelBiobio, Chile
    781.6×
  80. 80YangonYangon, Myanmar
    771.6×
  81. 80CuernavacaMorelos, Mexico
    771.6×
  82. 80Missouri CityTexas, United States
    771.6×
  83. 83Khlong LuangPathum Thani, Thailand
    771.5×
  84. 84Colorado SpringsColorado, United States
    771.5×
  85. 85Victoria de DurangoDurango, Mexico
    761.5×
  86. 85EdmondOklahoma, United States
    761.5×
  87. 87SpringdaleArkansas, United States
    761.5×
  88. 88JenksOklahoma, United States
    761.5×
  89. 89Samut PrakanSamut Prakan, Thailand
    761.5×
  90. 89MooreOklahoma, United States
    761.5×
  91. 89Oklahoma CityOklahoma, United States
    761.5×
  92. 89Mission BendTexas, United States
    761.5×
  93. 93McAlesterOklahoma, United States
    761.5×
  94. 94Puerto VarasLos Lagos Region, Chile
    751.5×
  95. 95QuillotaValparaiso, Chile
    751.5×
  96. 95CoquimboCoquimbo Region, Chile
    751.5×
  97. 97New OrleansLouisiana, United States
    751.5×
  98. 98ShakopeeMinnesota, United States
    751.5×
  99. 99ParadiseCalifornia, United States
    741.4×
  100. 100CuricóMaule Region, Chile
    741.4×
  101. 100LafayetteLouisiana, United States
    741.4×
  102. 100Ponca CityOklahoma, United States
    741.4×
  103. 100HarrisburgPennsylvania, United States
    741.4×
  104. 104Saint-ÉtienneAuvergne-Rhône-Alpes, France
    741.4×
  105. 104Clermont-FerrandAuvergne-Rhône-Alpes, France
    741.4×
  106. 106Nakhon PathomNakhon Pathom, Thailand
    741.4×
  107. 106Ciudad Benito JuárezNuevo León, Mexico
    741.4×
  108. 108Winston-SalemNorth Carolina, United States
    731.4×
  109. 109DerbyKansas, United States
    731.4×
  110. 110Mueang NonthaburiNonthaburi, Thailand
    721.4×
  111. 110Bourg-en-BresseAuvergne-Rhône-Alpes, France
    721.4×
  112. 110ShreveportLouisiana, United States
    721.4×
  113. 113MinatitlánVeracruz, Mexico
    721.4×
  114. 113Alto HospicioTarapacá, Chile
    721.4×
  115. 115TocopillaAntofagasta, Chile
    711.3×
  116. 115Hacienda Santa FeJalisco, Mexico
    711.3×
  117. 117QuinteroValparaiso, Chile
    711.3×
  118. 117Kansas CityKansas, United States
    711.3×
  119. 119ConcónValparaiso, Chile
    711.3×
  120. 119ClemmonsNorth Carolina, United States
    711.3×
  121. 119Saint MichaelMinnesota, United States
    711.3×
  122. 119ClevelandOhio, United States
    711.3×
  123. 119CarlislePennsylvania, United States
    711.3×
  124. 124RochesterMinnesota, United States
    711.3×
  125. 125CauquenesMaule Region, Chile
    711.3×
  126. 126MannheimBaden-Wurttemberg, Germany
    711.3×
  127. 126GainesvilleGeorgia, United States
    711.3×
  128. 128DentonTexas, United States
    701.3×
  129. 128Fort WorthTexas, United States
    701.3×
  130. 128Grande PrairieAlberta, Canada
    701.3×
  131. 131PrešovPrešov Region, Slovakia
    701.3×
  132. 132Ludwigshafen am RheinRheinland-Pfalz, Germany
    701.3×
  133. 132WatertownSouth Dakota, United States
    701.3×
  134. 134BelmopanCayo District, Belize
    701.3×
  135. 134AthensGeorgia, United States
    701.3×
  136. 134YorkPennsylvania, United States
    701.3×
  137. 134ChattanoogaTennessee, United States
    701.3×
  138. 134East RidgeTennessee, United States
    701.3×
  139. 139StuttgartBaden-Wurttemberg, Germany
    691.3×
  140. 139FilderstadtBaden-Wurttemberg, Germany
    691.3×
  141. 139Puerto MonttLos Lagos Region, Chile
    691.3×
  142. 139DallasTexas, United States
    691.3×
  143. 139SaginawTexas, United States
    691.3×
  144. 139CheyenneWyoming, United States
    691.3×
  145. 145Chalon-sur-SaôneBourgogne-Franche-Comté, France
    691.3×
  146. 145Laudio / LlodioBasque Country, Spain
    691.3×
  147. 145AricaArica y Parinacota Region, Chile
    691.3×
  148. 145LancasterPennsylvania, United States
    691.3×
  149. 145LebanonPennsylvania, United States
    691.3×
  150. 150Romans-sur-IsèreAuvergne-Rhône-Alpes, France
    691.3×
  151. 150TemucoAraucania, Chile
    691.3×
  152. 152TopekaKansas, United States
    691.2×
  153. 152BoulderColorado, United States
    691.2×
  154. 154Kempten (Allgäu)Bavaria, Germany
    691.2×
  155. 154HerrenbergBaden-Wurttemberg, Germany
    691.2×
  156. 154Bad KreuznachRheinland-Pfalz, Germany
    691.2×
  157. 154MaconGeorgia, United States
    691.2×
  158. 154Saint CloudMinnesota, United States
    691.2×
  159. 159LawrencevilleGeorgia, United States
    691.2×
  160. 159Candler-McAfeeGeorgia, United States
    691.2×
  161. 161WormsRheinland-Pfalz, Germany
    681.2×
  162. 161TrnavaTrnava Region, Slovakia
    681.2×
  163. 161Viña del MarValparaiso, Chile
    681.2×
  164. 161Rose HillVirginia, United States
    681.2×
  165. 165UlmBaden-Wurttemberg, Germany
    681.2×
  166. 165CalamaAntofagasta, Chile
    681.2×
  167. 167VesoulBourgogne-Franche-Comté, France
    681.2×
  168. 167LinaresMaule Region, Chile
    681.2×
  169. 167Ciudad ApodacaNuevo León, Mexico
    681.2×
  170. 167AberdeenSouth Dakota, United States
    681.2×
  171. 171ChillánÑuble, Chile
    681.2×
  172. 172AstanaAstana, Kazakhstan
    681.2×
  173. 172ModugnoApulia, Italy
    681.2×
  174. 172KnoxvilleTennessee, United States
    681.2×
  175. 172CorsicanaTexas, United States
    681.2×
  176. 176ReutlingenBaden-Wurttemberg, Germany
    671.2×
  177. 176PforzheimBaden-Wurttemberg, Germany
    671.2×
  178. 176OstravaMoravian-Silesian Region, Czechia
    671.2×
  179. 176College StationTexas, United States
    671.2×
  180. 176St. AlbertAlberta, Canada
    671.2×
  181. 181ThionvilleGrand Est, France
    671.2×
  182. 181LyonAuvergne-Rhône-Alpes, France
    671.2×
  183. 183SpeyerRheinland-Pfalz, Germany
    671.2×
  184. 183LudwigsburgBaden-Wurttemberg, Germany
    671.2×
  185. 183BohumínMoravian-Silesian Region, Czechia
    671.2×
  186. 183TalcahuanoBiobio, Chile
    671.2×
  187. 183Silao de la VictoriaGuanajuato, Mexico
    671.2×
  188. 183León de los AldamaGuanajuato, Mexico
    671.2×
  189. 183IndianapolisIndiana, United States
    671.2×
  190. 190WieslochBaden-Wurttemberg, Germany
    671.2×
  191. 190LotaBiobio, Chile
    671.2×
  192. 190SpringfieldVirginia, United States
    671.2×
  193. 193HeilbronnBaden-Wurttemberg, Germany
    671.2×
  194. 193Saint-ChamondAuvergne-Rhône-Alpes, France
    671.2×
  195. 193BogotáBogota D.C., Colombia
    671.2×
  196. 193BirminghamAlabama, United States
    671.2×
  197. 193Fort SmithArkansas, United States
    671.2×
  198. 193St. LouisMissouri, United States
    671.2×
  199. 193CharlottesvilleVirginia, United States
    671.2×
  200. 193RoanokeVirginia, United States
    671.2×

Top 200 of 1,304 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, May 23, 2023, smogrank.com/history/2023-05-23 (accessed 2 Oct 2026).

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