SmogRank / History / April 23, 2023

Most polluted cities on April 23, 2023

1,299 cities ranked by their average PM2.5 over the day; the worst was Piedras Negras, Mexico, at 353.0 µg/m³. Each city's own local calendar day.

← Piedras Negras 353.0 µg/m³ 300 µg/m³15 WHO 24-hour guideline
Every city ranked for April 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. 1Piedras NegrasCoahuila, Mexico
    500+23.5×
  2. 2Puerto VarasLos Lagos Region, Chile
    1523.8×
  3. 3TlaquepaqueJalisco, Mexico
    1513.7×
  4. 4ChillánÑuble, Chile
    1373.3×
  5. 5LinaresMaule Region, Chile
    1353.3×
  6. 6Kampalalow-cost sensorsCentral Region, Uganda
    1333.2×
  7. 7San CarlosÑuble, Chile
    1283.1×
  8. 8BamakoBamako, Mali
    1263.0×
  9. 9Kathmandulow-cost sensorsBagmati Province, Nepal
    1253.0×
  10. 10HyderabadTelangana, India
    1233.0×
  11. 10La UniónLos Ríos Region, Chile
    1233.0×
  12. 12Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1222.9×
  13. 13Silao de la VictoriaGuanajuato, Mexico
    1202.9×
  14. 14CuricóMaule Region, Chile
    1182.8×
  15. 14CelayaGuanajuato, Mexico
    1182.8×
  16. 16Ciudad JuárezChihuahua, Mexico
    1182.8×
  17. 17ValdiviaLos Ríos Region, Chile
    1172.8×
  18. 18NacimientoBiobio, Chile
    1172.8×
  19. 19Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1162.8×
  20. 20MexicaliBaja California, Mexico
    1142.7×
  21. 21CholulaPuebla, Mexico
    1052.5×
  22. 22RabinalBaja Verapaz, Guatemala
    1052.5×
  23. 23Guatemala CityGuatemala, Guatemala
    1042.5×
  24. 23ToméBiobio, Chile
    1042.5×
  25. 25Puerto MonttLos Lagos Region, Chile
    1002.4×
  26. 26RengoO'Higgins Region, Chile
    992.3×
  27. 27CoronelBiobio, Chile
    962.2×
  28. 28OsornoLos Lagos Region, Chile
    962.2×
  29. 28HualquiBiobio, Chile
    962.2×
  30. 30San Andrés TuxtlaVeracruz, Mexico
    952.2×
  31. 31VeracruzVeracruz, Mexico
    952.2×
  32. 31CoyhaiqueAysén, Chile
    952.2×
  33. 33SalamancaGuanajuato, Mexico
    942.1×
  34. 34RancaguaO'Higgins Region, Chile
    932.1×
  35. 35SantiagoSantiago Metropolitan, Chile
    922.1×
  36. 36ThembisaGauteng, South Africa
    912.0×
  37. 36San Francisco TlalcilalcalpanMéxico, Mexico
    912.0×
  38. 38PristinaPristina, Kosovo
    902.0×
  39. 39Puerto AysénAysén, Chile
    881.9×
  40. 39Puente AltoSantiago Metropolitan, Chile
    881.9×
  41. 41CoatzacoalcosVeracruz, Mexico
    881.9×
  42. 42Ciudad Benito JuárezNuevo León, Mexico
    871.9×
  43. 43JeddahMecca Region, Saudi Arabia
    861.9×
  44. 43Karachilow-cost sensorsSindh, Pakistan
    861.9×
  45. 43San Mateo AtencoMéxico, Mexico
    861.9×
  46. 46ChiguayanteBiobio, Chile
    861.9×
  47. 47BelmopanCayo District, Belize
    861.9×
  48. 48CauquenesMaule Region, Chile
    851.8×
  49. 49XonacatlánMéxico, Mexico
    851.8×
  50. 49GuadalajaraJalisco, Mexico
    851.8×
  51. 51TalcaMaule Region, Chile
    841.8×
  52. 52AntananarivoAnalamanga, Madagascar
    841.8×
  53. 53Novi PazarCentral Serbia, Serbia
    831.8×
  54. 53IrapuatoGuanajuato, Mexico
    831.8×
  55. 55BaghdadBaghdad, Iraq
    831.7×
  56. 56ConcepciónBiobio, Chile
    821.7×
  57. 57TalaganteSantiago Metropolitan, Chile
    821.7×
  58. 57HualpénBiobio, Chile
    821.7×
  59. 59ValjevoCentral Serbia, Serbia
    821.7×
  60. 59TijuanaBaja California, Mexico
    821.7×
  61. 61TolucaMéxico, Mexico
    811.7×
  62. 61QuillotaValparaiso, Chile
    811.7×
  63. 63LazarevacCentral Serbia, Serbia
    811.7×
  64. 64LotaBiobio, Chile
    811.7×
  65. 65BakuBaki, Azerbaijan
    811.7×
  66. 65RacibórzSilesia, Poland
    811.7×
  67. 67DelhiDelhi, India
    811.7×
  68. 68BohumínMoravian-Silesian Region, Czechia
    801.6×
  69. 69Viña del MarValparaiso, Chile
    801.6×
  70. 70AshgabatAshgabat, Turkmenistan
    801.6×
  71. 71Spišská Nová VesKošice Region, Slovakia
    791.6×
  72. 72Lahorelow-cost sensorsPunjab, Pakistan
    791.6×
  73. 73TalcahuanoBiobio, Chile
    781.6×
  74. 74DunaújvárosFejér, Hungary
    781.6×
  75. 75PueblaPuebla, Mexico
    781.6×
  76. 76QuinteroValparaiso, Chile
    771.6×
  77. 77ObrenovacCentral Serbia, Serbia
    771.5×
  78. 77Santiago de QuerétaroQuerétaro, Mexico
    771.5×
  79. 79Islamabadlow-cost sensorsIslamabad, Pakistan
    761.5×
  80. 80ZemunCentral Serbia, Serbia
    761.5×
  81. 81León de los AldamaGuanajuato, Mexico
    751.5×
  82. 82ColomboWestern Province, Sri Lanka
    751.5×
  83. 82KrakówLesser Poland, Poland
    751.5×
  84. 82ConcónValparaiso, Chile
    751.5×
  85. 85AricaArica y Parinacota Region, Chile
    741.4×
  86. 86Czechowice-DziedziceSilesia, Poland
    741.4×
  87. 87TrnavaTrnava Region, Slovakia
    741.4×
  88. 87Kędzierzyn-KoźleOpole Voivodeship, Poland
    741.4×
  89. 87GuanajuatoGuanajuato, Mexico
    741.4×
  90. 90Ciudad NezahualcoyotlMéxico, Mexico
    741.4×
  91. 91LublinLublin, Poland
    741.4×
  92. 91GdańskPomerania, Poland
    741.4×
  93. 91Sunland ParkNew Mexico, United States
    741.4×
  94. 94Jastrzębie ZdrójSilesia, Poland
    731.4×
  95. 95AbasoloGuanajuato, Mexico
    731.4×
  96. 96Tepeji del Río de OcampoHidalgo, Mexico
    731.4×
  97. 96San Juan del RíoQuerétaro, Mexico
    731.4×
  98. 96TemucoAraucania, Chile
    731.4×
  99. 96San DiegoCalifornia, United States
    731.4×
  100. 100ČačakCentral Serbia, Serbia
    731.4×
  101. 100CuernavacaMorelos, Mexico
    731.4×
  102. 102La SerenaCoquimbo Region, Chile
    721.4×
  103. 102San Miguel de AllendeGuanajuato, Mexico
    721.4×
  104. 104OpoleOpole Voivodeship, Poland
    721.4×
  105. 104San Luis de la PazGuanajuato, Mexico
    721.4×
  106. 106Addis AbabaAddis Ababa, Ethiopia
    721.4×
  107. 107PrešovPrešov Region, Slovakia
    721.3×
  108. 107KošiceKošice Region, Slovakia
    721.3×
  109. 107San Pedro de la PazBiobio, Chile
    721.3×
  110. 110OlomoucOlomouc Region, Czechia
    711.3×
  111. 111KościanGreater Poland, Poland
    711.3×
  112. 112Novi SadVojvodina, Serbia
    711.3×
  113. 113SenicaTrnava Region, Slovakia
    711.3×
  114. 113St. John'sNewfoundland and Labrador, Canada
    711.3×
  115. 115CalexicoCalifornia, United States
    701.3×
  116. 116KragujevacCentral Serbia, Serbia
    701.3×
  117. 116TocopillaAntofagasta, Chile
    701.3×
  118. 118ConakryConakry, Guinea
    701.3×
  119. 118Bielsko-BialaSilesia, Poland
    701.3×
  120. 120SzegedCsongrád, Hungary
    701.3×
  121. 120NottinghamEngland, United Kingdom
    701.3×
  122. 122PančevoVojvodina, Serbia
    691.3×
  123. 122ŁaskŁódź Voivodeship, Poland
    691.3×
  124. 122GarcíaNuevo León, Mexico
    691.3×
  125. 125ŁukówLublin, Poland
    691.3×
  126. 126NiskoSubcarpathia, Poland
    691.3×
  127. 126CopiapóAtacama, Chile
    691.3×
  128. 128OstravaMoravian-Silesian Region, Czechia
    691.2×
  129. 129Kinshasalow-cost sensorsKinshasa, Democratic Republic of the Congo
    691.2×
  130. 129Santa CatarinaNuevo León, Mexico
    691.2×
  131. 131Manchesterlow-cost sensorsEngland, United Kingdom
    681.2×
  132. 131DěčínÚstí nad Labem Region, Czechia
    681.2×
  133. 131TlaxcalaTlaxcala, Mexico
    681.2×
  134. 131SaltilloCoahuila, Mexico
    681.2×
  135. 135KłodzkoLower Silesia, Poland
    681.2×
  136. 135CalamaAntofagasta, Chile
    681.2×
  137. 137Český TěšínMoravian-Silesian Region, Czechia
    681.2×
  138. 138Stoke-on-TrentEngland, United Kingdom
    681.2×
  139. 139BelgradeCentral Serbia, Serbia
    681.2×
  140. 139HavířovMoravian-Silesian Region, Czechia
    681.2×
  141. 139Mexico CityMexico City, Mexico
    681.2×
  142. 139CoquimboCoquimbo Region, Chile
    681.2×
  143. 139SocorroTexas, United States
    681.2×
  144. 144BucharestBucharest, Romania
    671.2×
  145. 145GdyniaPomerania, Poland
    671.2×
  146. 145Los ÁngelesBiobio, Chile
    671.2×
  147. 147ŽilinaŽilina Region, Slovakia
    671.2×
  148. 147MartinŽilina Region, Slovakia
    671.2×
  149. 149ZvolenBanská Bystrica Region, Slovakia
    671.2×
  150. 150RzeszówSubcarpathia, Poland
    671.2×
  151. 150SmederevoCentral Serbia, Serbia
    671.2×
  152. 152NitraNitra Region, Slovakia
    661.2×
  153. 152Victoria de DurangoDurango, Mexico
    661.2×
  154. 154CardiffWales, United Kingdom
    661.2×
  155. 155Naucalpan de JuárezMéxico, Mexico
    661.1×
  156. 156SalorTashkent Region, Uzbekistan
    661.1×
  157. 156Birminghamlow-cost sensorsEngland, United Kingdom
    661.1×
  158. 156MonterreyNuevo León, Mexico
    661.1×
  159. 159PirotCentral Serbia, Serbia
    661.1×
  160. 159GroningenGroningen, The Netherlands
    661.1×
  161. 161Cluj-NapocaCluj County, Romania
    661.1×
  162. 161StarachowiceŚwiętokrzyskie, Poland
    661.1×
  163. 163KrapkowiceOpole Voivodeship, Poland
    651.1×
  164. 164LiberpolisCounty of Osijek-Baranja, Croatia
    651.1×
  165. 165ChesterfieldEngland, United Kingdom
    651.1×
  166. 165Jurupa ValleyCalifornia, United States
    651.1×
  167. 167KatowiceSilesia, Poland
    651.1×
  168. 168GrajewoPodlasie, Poland
    641.1×
  169. 168ĆuprijaCentral Serbia, Serbia
    641.1×
  170. 168ToruńKujawsko-Pomorskie, Poland
    641.1×
  171. 168PoznańGreater Poland, Poland
    641.1×
  172. 168TopekaKansas, United States
    641.1×
  173. 173AcharnésAttica, Greece
    641.1×
  174. 174AlessandriaPiedmont, Italy
    641.1×
  175. 175WrocławLower Silesia, Poland
    641.1×
  176. 175Pachuca de SotoHidalgo, Mexico
    641.1×
  177. 175El CajonCalifornia, United States
    641.1×
  178. 178NišCentral Serbia, Serbia
    631.1×
  179. 178SheffieldEngland, United Kingdom
    631.1×
  180. 178OldenburgLower Saxony, Germany
    631.1×
  181. 178Hradec KrálovéHradec Králové Region, Czechia
    631.1×
  182. 178CuranilahueBiobio, Chile
    631.1×
  183. 183BratislavaBratislava Region, Slovakia
    631.0×
  184. 183MiędzyrzeczLubusz, Poland
    631.0×
  185. 185Abujalow-cost sensorsFCT, Nigeria
    631.0×
  186. 185Kingston upon HullEngland, United Kingdom
    631.0×
  187. 185Los AngelesCalifornia, United States
    631.0×
  188. 188WarsawMazovia, Poland
    631.0×
  189. 188SremčicaCentral Serbia, Serbia
    631.0×
  190. 188Ga-RankuwaNorth West, South Africa
    631.0×
  191. 188ZlínZlín, Czechia
    631.0×
  192. 188Valašské MeziříčíZlín, Czechia
    631.0×
  193. 193DurbanKwaZulu-Natal, South Africa
    631.0×
  194. 194EłkWarmia-Masuria, Poland
    621.0×
  195. 195BarnsleyEngland, United Kingdom
    621.0×
  196. 195GrazStyria, Austria
    621.0×
  197. 195BeneventoCampania, Italy
    621.0×
  198. 195FutogVojvodina, Serbia
    621.0×
  199. 199MumbaiMaharashtra, India
    621.0×
  200. 200VentspilsVentspils, Latvia
    621.0×

Top 200 of 1,299 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, April 23, 2023, smogrank.com/history/2023-04-23 (accessed 2 Oct 2026).

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