SmogRank / History / June 21, 2023

Most polluted cities on June 21, 2023

1,479 cities ranked by their average PM2.5 over the day; the worst was Piedras Negras, Mexico, at 358.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during June 21, 2023. All episodes.

← Piedras Negras 358.0 µg/m³ 300 µg/m³15 WHO 24-hour guideline
Every city ranked for June 21, 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+23.9×
  2. 2CoyhaiqueAysén, Chile
    23710.8×
  3. 3HualquiBiobio, Chile
    1786.3×
  4. 4NacimientoBiobio, Chile
    1766.0×
  5. 5LinaresMaule Region, Chile
    1705.5×
  6. 6TemucoAraucania, Chile
    1695.4×
  7. 7Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1624.7×
  8. 8GuadalajaraJalisco, Mexico
    1614.6×
  9. 9TlaquepaqueJalisco, Mexico
    1584.4×
  10. 10ValdiviaLos Ríos Region, Chile
    1584.4×
  11. 11RengoO'Higgins Region, Chile
    1574.3×
  12. 12Lahorelow-cost sensorsPunjab, Pakistan
    1544.0×
  13. 13CuricóMaule Region, Chile
    1533.9×
  14. 14RancaguaO'Higgins Region, Chile
    1533.9×
  15. 15KigaliKigali, Rwanda
    1533.9×
  16. 16JakartaJakarta, Indonesia
    1523.8×
  17. 17Islamabadlow-cost sensorsIslamabad, Pakistan
    1523.8×
  18. 18Los ÁngelesBiobio, Chile
    1523.8×
  19. 19HualpénBiobio, Chile
    1523.8×
  20. 20ChillánÑuble, Chile
    1503.7×
  21. 21Dhakalow-cost sensorsDhaka Division, Bangladesh
    1463.6×
  22. 22Rouyn-NorandaQuebec, Canada
    1423.5×
  23. 23San CarlosÑuble, Chile
    1393.4×
  24. 24CuranilahueBiobio, Chile
    1363.3×
  25. 25OsornoLos Lagos Region, Chile
    1323.2×
  26. 26Addis AbabaAddis Ababa, Ethiopia
    1273.1×
  27. 27Puerto AysénAysén, Chile
    1253.0×
  28. 28CauquenesMaule Region, Chile
    1182.8×
  29. 28Greater SudburyOntario, Canada
    1182.8×
  30. 30SarajevoFederation of B&H, Bosnia and Herzegovina
    1182.8×
  31. 30La UniónLos Ríos Region, Chile
    1182.8×
  32. 30North BayOntario, Canada
    1182.8×
  33. 33TalcaMaule Region, Chile
    1172.8×
  34. 34SantiagoSantiago Metropolitan, Chile
    1122.7×
  35. 35MinatitlánVeracruz, Mexico
    1122.7×
  36. 36HyderabadTelangana, India
    1082.5×
  37. 37Puente AltoSantiago Metropolitan, Chile
    1072.5×
  38. 38AshgabatAshgabat, Turkmenistan
    1042.4×
  39. 39DushanbeDushanbe, Tajikistan
    1022.4×
  40. 40SenicaTrnava Region, Slovakia
    1012.4×
  41. 41QuillotaValparaiso, Chile
    1012.4×
  42. 42Puerto MonttLos Lagos Region, Chile
    992.3×
  43. 43ChiguayanteBiobio, Chile
    972.3×
  44. 44PristinaPristina, Kosovo
    962.2×
  45. 45TalaganteSantiago Metropolitan, Chile
    962.2×
  46. 46CholulaPuebla, Mexico
    962.2×
  47. 47León de los AldamaGuanajuato, Mexico
    952.2×
  48. 48ChennaiTamil Nadu, India
    942.1×
  49. 49IrapuatoGuanajuato, Mexico
    922.1×
  50. 50TrnavaTrnava Region, Slovakia
    912.0×
  51. 50Puerto VarasLos Lagos Region, Chile
    912.0×
  52. 52San Andrés TuxtlaVeracruz, Mexico
    902.0×
  53. 53DelhiDelhi, India
    892.0×
  54. 54SalorTashkent Region, Uzbekistan
    881.9×
  55. 55GrajewoPodlasie, Poland
    871.9×
  56. 56AntananarivoAnalamanga, Madagascar
    851.8×
  57. 57CoronelBiobio, Chile
    851.8×
  58. 58BratislavaBratislava Region, Slovakia
    851.8×
  59. 58LotaBiobio, Chile
    851.8×
  60. 60Karachilow-cost sensorsSindh, Pakistan
    851.8×
  61. 61KaliszGreater Poland, Poland
    841.8×
  62. 62TalcahuanoBiobio, Chile
    831.7×
  63. 63PueblaPuebla, Mexico
    831.7×
  64. 64ŁaskŁódź Voivodeship, Poland
    821.7×
  65. 65Kathmandulow-cost sensorsBagmati Province, Nepal
    821.7×
  66. 66AbasoloGuanajuato, Mexico
    821.7×
  67. 67Şabāḩ as SālimMubārak al Kabīr, Kuwait
    811.7×
  68. 67SalamancaGuanajuato, Mexico
    811.7×
  69. 69NairobiNairobi County, Kenya
    811.7×
  70. 69KolkataWest Bengal, India
    811.7×
  71. 69RužomberokŽilina Region, Slovakia
    811.7×
  72. 72SaltilloCoahuila, Mexico
    801.6×
  73. 73NitraNitra Region, Slovakia
    801.6×
  74. 73Český TěšínMoravian-Silesian Region, Czechia
    801.6×
  75. 73ConcónValparaiso, Chile
    801.6×
  76. 76HavířovMoravian-Silesian Region, Czechia
    791.6×
  77. 76Ciudad JuárezChihuahua, Mexico
    791.6×
  78. 78PrešovPrešov Region, Slovakia
    791.6×
  79. 78CoquimboCoquimbo Region, Chile
    791.6×
  80. 80HammondIndiana, United States
    781.6×
  81. 81BohumínMoravian-Silesian Region, Czechia
    781.6×
  82. 81SzczecinWest Pomerania, Poland
    781.6×
  83. 81Viña del MarValparaiso, Chile
    781.6×
  84. 81SpringdaleArkansas, United States
    781.6×
  85. 85BarrieOntario, Canada
    781.6×
  86. 86WłocławekKujawsko-Pomorskie, Poland
    771.6×
  87. 87BurnsvilleMinnesota, United States
    771.5×
  88. 88CelayaGuanajuato, Mexico
    771.5×
  89. 88NapervilleIllinois, United States
    771.5×
  90. 90Alto HospicioTarapacá, Chile
    771.5×
  91. 91Calumet CityIllinois, United States
    771.5×
  92. 91Saint CloudMinnesota, United States
    771.5×
  93. 93Klagenfurt am WörtherseeCarinthia, Austria
    761.5×
  94. 93JolietIllinois, United States
    761.5×
  95. 93DuluthMinnesota, United States
    761.5×
  96. 96ToruńKujawsko-Pomorskie, Poland
    761.5×
  97. 97KošiceKošice Region, Slovakia
    761.5×
  98. 97MielecSubcarpathia, Poland
    761.5×
  99. 97SuperiorWisconsin, United States
    761.5×
  100. 100MiędzyrzeczLubusz, Poland
    751.5×
  101. 101KatowiceSilesia, Poland
    751.5×
  102. 101NaplesCampania, Italy
    751.5×
  103. 103LegionowoMazovia, Poland
    751.5×
  104. 104MartinŽilina Region, Slovakia
    751.5×
  105. 104Sault Ste. MarieOntario, Canada
    751.5×
  106. 106HollandMichigan, United States
    751.5×
  107. 106Saint MichaelMinnesota, United States
    751.5×
  108. 106ShakopeeMinnesota, United States
    751.5×
  109. 109PortageIndiana, United States
    741.4×
  110. 110PułtuskMazovia, Poland
    741.4×
  111. 110AugustówPodlasie, Poland
    741.4×
  112. 112HumennéPrešov Region, Slovakia
    741.4×
  113. 112KielceŚwiętokrzyskie, Poland
    741.4×
  114. 112MinneapolisMinnesota, United States
    741.4×
  115. 112South MilwaukeeWisconsin, United States
    741.4×
  116. 116Apple ValleyMinnesota, United States
    741.4×
  117. 117KętrzynWarmia-Masuria, Poland
    741.4×
  118. 117AustinTexas, United States
    741.4×
  119. 117South BendIndiana, United States
    741.4×
  120. 120Frýdek-MístekMoravian-Silesian Region, Czechia
    731.4×
  121. 120BaytownTexas, United States
    731.4×
  122. 122BrnoSouth Moravian, Czechia
    731.4×
  123. 122KrakówLesser Poland, Poland
    731.4×
  124. 122QuinteroValparaiso, Chile
    731.4×
  125. 122Fort WorthTexas, United States
    731.4×
  126. 122MilwaukeeWisconsin, United States
    731.4×
  127. 127ZnojmoSouth Moravian, Czechia
    731.4×
  128. 127OlomoucOlomouc Region, Czechia
    731.4×
  129. 127ŁódźŁódź Voivodeship, Poland
    731.4×
  130. 127Saint PaulMinnesota, United States
    731.4×
  131. 131Nong KhaemBangkok, Thailand
    731.4×
  132. 131KościanGreater Poland, Poland
    731.4×
  133. 131LimaLima Province, Peru
    731.4×
  134. 131TopekaKansas, United States
    731.4×
  135. 131ClevelandOhio, United States
    731.4×
  136. 131WaukeshaWisconsin, United States
    731.4×
  137. 137Kędzierzyn-KoźleOpole Voivodeship, Poland
    731.4×
  138. 137BydgoszczKujawsko-Pomorskie, Poland
    731.4×
  139. 137East ChicagoIndiana, United States
    731.4×
  140. 140SundsvallVästernorrland, Sweden
    721.4×
  141. 140BeneventoCampania, Italy
    721.4×
  142. 142TeltowBrandenburg, Germany
    721.4×
  143. 143HoustonTexas, United States
    721.4×
  144. 143MedinaOhio, United States
    721.4×
  145. 145ŻyrardówMazovia, Poland
    721.3×
  146. 145WatertownSouth Dakota, United States
    721.3×
  147. 147GrazStyria, Austria
    711.3×
  148. 147Romans-sur-IsèreAuvergne-Rhône-Alpes, France
    711.3×
  149. 147Gorzów WielkopolskiLubusz, Poland
    711.3×
  150. 147Ecatepec de MorelosMéxico, Mexico
    711.3×
  151. 147Des PlainesIllinois, United States
    711.3×
  152. 152Vranov nad TopľouPrešov Region, Slovakia
    711.3×
  153. 152TijuanaBaja California, Mexico
    711.3×
  154. 154São PauloSão Paulo, Brazil
    711.3×
  155. 154LaredoTexas, United States
    711.3×
  156. 154CaryIllinois, United States
    711.3×
  157. 157Novi SadVojvodina, Serbia
    711.3×
  158. 158WolfsbergCarinthia, Austria
    711.3×
  159. 158PotsdamBrandenburg, Germany
    711.3×
  160. 158Bernau bei BerlinBrandenburg, Germany
    711.3×
  161. 158ŚwinoujścieWest Pomerania, Poland
    711.3×
  162. 162StrausbergBrandenburg, Germany
    711.3×
  163. 162DentonTexas, United States
    711.3×
  164. 162Eau ClaireWisconsin, United States
    711.3×
  165. 162KitchenerOntario, Canada
    711.3×
  166. 166PruszkówMazovia, Poland
    701.3×
  167. 166BelgradeCentral Serbia, Serbia
    701.3×
  168. 166ConakryConakry, Guinea
    701.3×
  169. 166EberswaldeBrandenburg, Germany
    701.3×
  170. 166San Pedro de la PazBiobio, Chile
    701.3×
  171. 171BiałystokPodlasie, Poland
    701.3×
  172. 171ColomboWestern Province, Sri Lanka
    701.3×
  173. 171Schwedt (Oder)Brandenburg, Germany
    701.3×
  174. 171NorthbrookIllinois, United States
    701.3×
  175. 171AppletonWisconsin, United States
    701.3×
  176. 176KutnoŁódź Voivodeship, Poland
    701.3×
  177. 176ConcepciónBiobio, Chile
    701.3×
  178. 176MolineIllinois, United States
    701.3×
  179. 176AkronOhio, United States
    701.3×
  180. 176MadisonWisconsin, United States
    701.3×
  181. 176PeterboroughOntario, Canada
    701.3×
  182. 182ŽilinaŽilina Region, Slovakia
    701.3×
  183. 182ChicagoIllinois, United States
    701.3×
  184. 184BerlinState of Berlin, Germany
    701.3×
  185. 184PřerovOlomouc Region, Czechia
    701.3×
  186. 184WarrenOhio, United States
    701.3×
  187. 187ManamaManama, Bahrain
    691.3×
  188. 187FalkenseeBrandenburg, Germany
    691.3×
  189. 187AlbertvilleAuvergne-Rhône-Alpes, France
    691.3×
  190. 187Hradec KrálovéHradec Králové Region, Czechia
    691.3×
  191. 187Live OakTexas, United States
    691.3×
  192. 187RockfordIllinois, United States
    691.3×
  193. 187CantonOhio, United States
    691.3×
  194. 187Shaker HeightsOhio, United States
    691.3×
  195. 195Spišská Nová VesKošice Region, Slovakia
    691.3×
  196. 195ShenyangLiaoning, China
    691.3×
  197. 195ZvolenBanská Bystrica Region, Slovakia
    691.3×
  198. 195PłockMazovia, Poland
    691.3×
  199. 195La SerenaCoquimbo Region, Chile
    691.3×
  200. 200OstravaMoravian-Silesian Region, Czechia
    691.3×

Top 200 of 1,479 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, June 21, 2023, smogrank.com/history/2023-06-21 (accessed 2 Oct 2026).

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