SmogRank / History / July 9, 2023

Most polluted cities on July 9, 2023

1,562 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.

← Piedras Negras 986.0 µg/m³ 900 µg/m³15 WHO 24-hour guideline
Every city ranked for July 9, 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. 2CoyhaiqueAysén, Chile
    1988.1×
  3. 3HualpénBiobio, Chile
    1776.2×
  4. 4Fort St. JohnBritish Columbia, Canada
    1725.7×
  5. 5TalcahuanoBiobio, Chile
    1715.6×
  6. 6NacimientoBiobio, Chile
    1655.0×
  7. 7ChillánÑuble, Chile
    1574.3×
  8. 8Los ÁngelesBiobio, Chile
    1574.2×
  9. 9San CarlosÑuble, Chile
    1564.2×
  10. 10Fort McMurrayAlberta, Canada
    1533.9×
  11. 11ToméBiobio, Chile
    1483.6×
  12. 12CuranilahueBiobio, Chile
    1433.5×
  13. 13Puerto VarasLos Lagos Region, Chile
    1413.5×
  14. 14Karachilow-cost sensorsSindh, Pakistan
    1363.3×
  15. 15EdmontonAlberta, Canada
    1303.2×
  16. 16SantiagoSantiago Metropolitan, Chile
    1233.0×
  17. 17ChiguayanteBiobio, Chile
    1233.0×
  18. 18Dhakalow-cost sensorsDhaka Division, Bangladesh
    1212.9×
  19. 19JakartaJakarta, Indonesia
    1172.8×
  20. 20OsornoLos Lagos Region, Chile
    1162.8×
  21. 21Puerto AysénAysén, Chile
    1152.7×
  22. 22TemucoAraucania, Chile
    1142.7×
  23. 23La UniónLos Ríos Region, Chile
    1112.6×
  24. 24ConcepciónBiobio, Chile
    1112.6×
  25. 25LimaLima Province, Peru
    1082.6×
  26. 26LinaresMaule Region, Chile
    1072.5×
  27. 27HualquiBiobio, Chile
    1072.5×
  28. 28CoronelBiobio, Chile
    1052.5×
  29. 29Prince GeorgeBritish Columbia, Canada
    1042.5×
  30. 29Santa Anita - Los FicusLima region, Peru
    1042.5×
  31. 31SarajevoFederation of B&H, Bosnia and Herzegovina
    1022.4×
  32. 31Puente AltoSantiago Metropolitan, Chile
    1022.4×
  33. 33BakuBaki, Azerbaijan
    1012.4×
  34. 34San Pedro de la PazBiobio, Chile
    992.3×
  35. 35Addis AbabaAddis Ababa, Ethiopia
    972.3×
  36. 36CauquenesMaule Region, Chile
    952.2×
  37. 37Puerto MonttLos Lagos Region, Chile
    942.2×
  38. 38EvergemFlanders, Belgium
    932.1×
  39. 39Tepeji del Río de OcampoHidalgo, Mexico
    912.0×
  40. 40RancaguaO'Higgins Region, Chile
    902.0×
  41. 41Grande PrairieAlberta, Canada
    892.0×
  42. 42TalaganteSantiago Metropolitan, Chile
    892.0×
  43. 42QuillotaValparaiso, Chile
    892.0×
  44. 44AntananarivoAnalamanga, Madagascar
    881.9×
  45. 45PristinaPristina, Kosovo
    861.9×
  46. 46Şabāḩ as SālimMubārak al Kabīr, Kuwait
    851.8×
  47. 47St. AlbertAlberta, Canada
    841.8×
  48. 48DushanbeDushanbe, Tajikistan
    841.8×
  49. 48ValdiviaLos Ríos Region, Chile
    841.8×
  50. 48Red DeerAlberta, Canada
    841.8×
  51. 51Sherwood ParkAlberta, Canada
    831.7×
  52. 52MaldegemFlanders, Belgium
    821.7×
  53. 53CoquimboCoquimbo Region, Chile
    821.7×
  54. 54Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    821.7×
  55. 55QuinteroValparaiso, Chile
    811.7×
  56. 56MelunÎle-de-France, France
    811.7×
  57. 57TalcaMaule Region, Chile
    801.6×
  58. 58LochristiFlanders, Belgium
    801.6×
  59. 59GentFlanders, Belgium
    791.6×
  60. 60Villa Poeta José Gálvez BarrenecheaLima region, Peru
    781.6×
  61. 61WaregemFlanders, Belgium
    781.6×
  62. 62EindhovenNorth Brabant, The Netherlands
    781.6×
  63. 63Ciudad ApodacaNuevo León, Mexico
    781.6×
  64. 64ConcónValparaiso, Chile
    771.5×
  65. 65RengoO'Higgins Region, Chile
    761.5×
  66. 65San Francisco De BorjaLima region, Peru
    761.5×
  67. 67San Francisco TlalcilalcalpanMéxico, Mexico
    761.5×
  68. 68DelhiDelhi, India
    751.5×
  69. 68NaplesCampania, Italy
    751.5×
  70. 70AricaArica y Parinacota Region, Chile
    751.5×
  71. 71TolucaMéxico, Mexico
    751.5×
  72. 72Almatylow-cost sensorsAlmaty, Kazakhstan
    741.4×
  73. 73CuricóMaule Region, Chile
    741.4×
  74. 73Jardines de la SillaNuevo León, Mexico
    741.4×
  75. 75IzegemFlanders, Belgium
    741.4×
  76. 75NitraNitra Region, Slovakia
    741.4×
  77. 75XonacatlánMéxico, Mexico
    741.4×
  78. 78MedemblikNorth Holland, The Netherlands
    741.4×
  79. 79Nakhon RatchasimaNakhon Ratchasima, Thailand
    731.4×
  80. 80Ban Samae DamBangkok, Thailand
    731.4×
  81. 81KolkataWest Bengal, India
    731.4×
  82. 81Santa CatarinaNuevo León, Mexico
    731.4×
  83. 83CalamaAntofagasta, Chile
    721.4×
  84. 84PrešovPrešov Region, Slovakia
    721.4×
  85. 84CholulaPuebla, Mexico
    721.4×
  86. 84La SerenaCoquimbo Region, Chile
    721.4×
  87. 84CopiapóAtacama, Chile
    721.4×
  88. 88BratislavaBratislava Region, Slovakia
    711.3×
  89. 89Viña del MarValparaiso, Chile
    711.3×
  90. 90TournaiWallonia, Belgium
    711.3×
  91. 91KošiceKošice Region, Slovakia
    711.3×
  92. 91Alto HospicioTarapacá, Chile
    711.3×
  93. 93TocopillaAntofagasta, Chile
    701.3×
  94. 94MukdahanMukdahan, Thailand
    701.3×
  95. 94KortrijkFlanders, Belgium
    701.3×
  96. 94TrnavaTrnava Region, Slovakia
    701.3×
  97. 94AntofagastaAntofagasta, Chile
    701.3×
  98. 98ChennaiTamil Nadu, India
    701.3×
  99. 99MartinŽilina Region, Slovakia
    691.3×
  100. 100RoeselareFlanders, Belgium
    691.3×
  101. 101San Mateo AtencoMéxico, Mexico
    691.3×
  102. 102The HagueSouth Holland, The Netherlands
    691.2×
  103. 102CalgaryAlberta, Canada
    691.2×
  104. 104Bang NaBangkok, Thailand
    691.2×
  105. 104El CentroCalifornia, United States
    691.2×
  106. 106São PauloSão Paulo, Brazil
    681.2×
  107. 106Los AngelesCalifornia, United States
    681.2×
  108. 108Udon ThaniUdon Thani, Thailand
    681.2×
  109. 109MaassluisSouth Holland, The Netherlands
    681.2×
  110. 110LoeiLoei, Thailand
    671.2×
  111. 110's-GravenzandeSouth Holland, The Netherlands
    671.2×
  112. 112BarneveldGelderland, The Netherlands
    671.2×
  113. 113Nong KhaemBangkok, Thailand
    671.2×
  114. 113HalberstadtSaxony-Anhalt, Germany
    671.2×
  115. 115Velsen-ZuidNorth Holland, The Netherlands
    671.2×
  116. 115DelmenhorstLower Saxony, Germany
    671.2×
  117. 117SenicaTrnava Region, Slovakia
    661.2×
  118. 118ValenciennesHauts-de-France, France
    661.1×
  119. 119MostÚstí nad Labem Region, Czechia
    661.1×
  120. 120MenenFlanders, Belgium
    661.1×
  121. 120CelayaGuanajuato, Mexico
    661.1×
  122. 122KadaňÚstí nad Labem Region, Czechia
    651.1×
  123. 123AmmanAmman, Jordan
    651.1×
  124. 123KanchanaburiKanchanaburi, Thailand
    651.1×
  125. 123ŽilinaŽilina Region, Slovakia
    651.1×
  126. 123LitvínovÚstí nad Labem Region, Czechia
    651.1×
  127. 123MonterreyNuevo León, Mexico
    651.1×
  128. 123GalvestonTexas, United States
    651.1×
  129. 129SalorTashkent Region, Uzbekistan
    651.1×
  130. 129Lop BuriLopburi, Thailand
    651.1×
  131. 129Khon KaenKhon Kaen, Thailand
    651.1×
  132. 132Tha BoNong Khai, Thailand
    651.1×
  133. 132Si Sa KetSi Sa Ket, Thailand
    651.1×
  134. 132RoveretoTrentino-Alto Adige, Italy
    651.1×
  135. 135AlgiersAlgiers, Algeria
    641.1×
  136. 135BrightonEngland, United Kingdom
    641.1×
  137. 135BremerhavenBremen, Germany
    641.1×
  138. 135RoubaixHauts-de-France, France
    641.1×
  139. 139RatchaburiRatchaburi, Thailand
    641.1×
  140. 140KielceŚwiętokrzyskie, Poland
    641.1×
  141. 140VenrayLimburg, The Netherlands
    641.1×
  142. 140SalamancaGuanajuato, Mexico
    641.1×
  143. 143Khlong LuangPathum Thani, Thailand
    641.1×
  144. 143Khlong Sam WaBangkok, Thailand
    641.1×
  145. 145Islamabadlow-cost sensorsIslamabad, Pakistan
    641.1×
  146. 145OytenLower Saxony, Germany
    641.1×
  147. 145BerounCentral Bohemia, Czechia
    641.1×
  148. 148NanNan, Thailand
    631.1×
  149. 149Sing BuriSing Buri, Thailand
    631.0×
  150. 149PesaroThe Marches, Italy
    631.0×
  151. 151JeddahMecca Region, Saudi Arabia
    631.0×
  152. 151Spišská Nová VesKošice Region, Slovakia
    631.0×
  153. 151PhraePhrae, Thailand
    631.0×
  154. 151Le LamentinMartinique, Martinique
    631.0×
  155. 151TijuanaBaja California, Mexico
    631.0×
  156. 156NurembergBavaria, Germany
    631.0×
  157. 156CoburgBavaria, Germany
    631.0×
  158. 156Český TěšínMoravian-Silesian Region, Czechia
    631.0×
  159. 159HumennéPrešov Region, Slovakia
    631.0×
  160. 159WeißenfelsSaxony-Anhalt, Germany
    631.0×
  161. 159GroßostheimBavaria, Germany
    631.0×
  162. 162HillegomSouth Holland, The Netherlands
    631.0×
  163. 162WolfsbergCarinthia, Austria
    631.0×
  164. 164WeidenBavaria, Germany
    621.0×
  165. 164SaalfeldThuringia, Germany
    621.0×
  166. 164OstravaMoravian-Silesian Region, Czechia
    621.0×
  167. 164Hradec KrálovéHradec Králové Region, Czechia
    621.0×
  168. 164Jastrzębie ZdrójSilesia, Poland
    621.0×
  169. 164Port ArthurTexas, United States
    621.0×
  170. 170BrusselsBrussels Capital, Belgium
    621.0×
  171. 170NeuwiedRheinland-Pfalz, Germany
    621.0×
  172. 172LublinLublin, Poland
    621.0×
  173. 172Abidjanlow-cost sensorsAbidjan Autonomous District, Ivory Coast
    621.0×
  174. 172La Línea de la ConcepciónAndalusia, Spain
    621.0×
  175. 172Jurupa ValleyCalifornia, United States
    621.0×
  176. 176ZaanstadNorth Holland, The Netherlands
    621.0×
  177. 176IJsselsteinUtrecht, The Netherlands
    621.0×
  178. 176OldenburgLower Saxony, Germany
    621.0×
  179. 176BremenBremen, Germany
    621.0×
  180. 176BohumínMoravian-Silesian Region, Czechia
    621.0×
  181. 176TrentoTrentino-Alto Adige, Italy
    621.0×
  182. 176La Crescenta-Montroselow-cost sensorsCalifornia, United States
    621.0×
  183. 183MielecSubcarpathia, Poland
    621.0×
  184. 183LampangLampang, Thailand
    621.0×
  185. 183ShenyangLiaoning, China
    621.0×
  186. 183ConakryConakry, Guinea
    621.0×
  187. 183HavířovMoravian-Silesian Region, Czechia
    621.0×
  188. 183Santa ClaritaCalifornia, United States
    621.0×
  189. 189Mae SotTak, Thailand
    611.0×
  190. 189GranadaAndalusia, Spain
    611.0×
  191. 189KrefeldNorth Rhine-Westphalia, Germany
    611.0×
  192. 189JenaThuringia, Germany
    611.0×
  193. 193Saint-QuentinHauts-de-France, France
    611.0×
  194. 193LiberecLiberec Region, Czechia
    611.0×
  195. 193HomesteadFlorida, United States
    611.0×
  196. 196HyderabadTelangana, India
    611.0×
  197. 196GuangzhouGuangdong, China
    611.0×
  198. 196BadhoevedorpNorth Holland, The Netherlands
    611.0×
  199. 196Burg bei MagdeburgSaxony-Anhalt, Germany
    611.0×
  200. 196Mladá BoleslavCentral Bohemia, Czechia
    611.0×

Top 200 of 1,562 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 9, 2023, smogrank.com/history/2023-07-09 (accessed 2 Oct 2026).

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