SmogRank / History / August 9, 2023

Most polluted cities on August 9, 2023

1,793 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 August 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. 2BadgerAlaska, United States
    1796.4×
  3. 3NacimientoBiobio, Chile
    1776.1×
  4. 4LinaresMaule Region, Chile
    1685.4×
  5. 5FairbanksAlaska, United States
    1675.2×
  6. 6CoyhaiqueAysén, Chile
    1604.6×
  7. 7CuricóMaule Region, Chile
    1604.6×
  8. 8ChillánÑuble, Chile
    1594.4×
  9. 9TemucoAraucania, Chile
    1584.3×
  10. 9CauquenesMaule Region, Chile
    1584.3×
  11. 11TalcaMaule Region, Chile
    1574.3×
  12. 12RancaguaO'Higgins Region, Chile
    1574.2×
  13. 13San CarlosÑuble, Chile
    1564.2×
  14. 14Los ÁngelesBiobio, Chile
    1564.2×
  15. 15Puente AltoSantiago Metropolitan, Chile
    1533.9×
  16. 16KigaliKigali, Rwanda
    1533.9×
  17. 17SantiagoSantiago Metropolitan, Chile
    1533.9×
  18. 18ValdiviaLos Ríos Region, Chile
    1523.8×
  19. 19RengoO'Higgins Region, Chile
    1513.7×
  20. 20DushanbeDushanbe, Tajikistan
    1513.7×
  21. 21BeijingBeijing, China
    1513.7×
  22. 22Dhakalow-cost sensorsDhaka Division, Bangladesh
    1443.5×
  23. 23CuranilahueBiobio, Chile
    1403.4×
  24. 24KolkataWest Bengal, India
    1363.3×
  25. 25TalaganteSantiago Metropolitan, Chile
    1333.2×
  26. 26QuillotaValparaiso, Chile
    1333.2×
  27. 27Puerto AysénAysén, Chile
    1323.2×
  28. 28Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1323.2×
  29. 29Lahorelow-cost sensorsPunjab, Pakistan
    1303.1×
  30. 29HualquiBiobio, Chile
    1303.1×
  31. 31Kampalalow-cost sensorsCentral Region, Uganda
    1283.1×
  32. 32CoronelBiobio, Chile
    1243.0×
  33. 33OsornoLos Lagos Region, Chile
    1192.8×
  34. 34Santa Anita - Los FicusLima region, Peru
    1182.8×
  35. 35JakartaJakarta, Indonesia
    1172.8×
  36. 36Viña del MarValparaiso, Chile
    1122.7×
  37. 37ChennaiTamil Nadu, India
    1102.6×
  38. 38AlgeteMadrid, Spain
    1032.4×
  39. 39Islamabadlow-cost sensorsIslamabad, Pakistan
    1022.4×
  40. 40Alcalá de HenaresMadrid, Spain
    1012.4×
  41. 41La UniónLos Ríos Region, Chile
    982.3×
  42. 42ManamaManama, Bahrain
    972.2×
  43. 43MóstolesMadrid, Spain
    962.2×
  44. 44ValdemoroMadrid, Spain
    952.2×
  45. 45ConcónValparaiso, Chile
    942.2×
  46. 45MexicaliBaja California, Mexico
    942.2×
  47. 47HanoiHanoi, Vietnam
    922.1×
  48. 47CoquimboCoquimbo Region, Chile
    922.1×
  49. 49QuinteroValparaiso, Chile
    922.1×
  50. 50Collado-VillalbaMadrid, Spain
    912.1×
  51. 50ChiguayanteBiobio, Chile
    912.1×
  52. 52CholulaPuebla, Mexico
    912.0×
  53. 53ToméBiobio, Chile
    902.0×
  54. 54TalcahuanoBiobio, Chile
    892.0×
  55. 55LimaLima Province, Peru
    892.0×
  56. 56TlaquepaqueJalisco, Mexico
    881.9×
  57. 57Addis AbabaAddis Ababa, Ethiopia
    871.9×
  58. 57PristinaPristina, Kosovo
    871.9×
  59. 59ConcepciónBiobio, Chile
    871.9×
  60. 60LotaBiobio, Chile
    871.9×
  61. 61DelhiDelhi, India
    861.9×
  62. 62CuencaCastille-La Mancha, Spain
    851.8×
  63. 63PalenciaCastille and León, Spain
    851.8×
  64. 64EdmontonAlberta, Canada
    841.8×
  65. 65Victoria de DurangoDurango, Mexico
    831.8×
  66. 66BamakoBamako, Mali
    821.7×
  67. 67AshgabatAshgabat, Turkmenistan
    821.7×
  68. 68Şabāḩ as SālimMubārak al Kabīr, Kuwait
    821.7×
  69. 69GuangzhouGuangdong, China
    811.7×
  70. 70NairobiNairobi County, Kenya
    811.7×
  71. 70Karachilow-cost sensorsSindh, Pakistan
    811.7×
  72. 72BurnsvilleMinnesota, United States
    801.6×
  73. 73Nong KhaemBangkok, Thailand
    801.6×
  74. 74ShakopeeMinnesota, United States
    801.6×
  75. 75Medina del CampoCastille and León, Spain
    781.6×
  76. 76HyderabadTelangana, India
    781.6×
  77. 76BendOregon, United States
    781.6×
  78. 76San Francisco De BorjaLima region, Peru
    781.6×
  79. 79RochesterMinnesota, United States
    781.6×
  80. 80CosladaMadrid, Spain
    771.5×
  81. 81Puerto VarasLos Lagos Region, Chile
    771.5×
  82. 82XonacatlánMéxico, Mexico
    771.5×
  83. 83AntofagastaAntofagasta, Chile
    761.5×
  84. 84ToledoCastille-La Mancha, Spain
    751.5×
  85. 85BakuBaki, Azerbaijan
    751.5×
  86. 85Apple ValleyMinnesota, United States
    751.5×
  87. 85CalgaryAlberta, Canada
    751.5×
  88. 88Villa Poeta José Gálvez BarrenecheaLima region, Peru
    751.5×
  89. 88HollandMichigan, United States
    751.5×
  90. 90Puerto MonttLos Lagos Region, Chile
    751.5×
  91. 90CopiapóAtacama, Chile
    751.5×
  92. 90Ciudad Benito JuárezNuevo León, Mexico
    751.5×
  93. 93MadridMadrid, Spain
    741.4×
  94. 93AricaArica y Parinacota Region, Chile
    741.4×
  95. 95La SerenaCoquimbo Region, Chile
    741.4×
  96. 95Santa CatarinaNuevo León, Mexico
    741.4×
  97. 95Eau ClaireWisconsin, United States
    741.4×
  98. 98Saint PaulMinnesota, United States
    741.4×
  99. 99SarajevoFederation of B&H, Bosnia and Herzegovina
    741.4×
  100. 100SalorTashkent Region, Uzbekistan
    731.4×
  101. 101AntananarivoAnalamanga, Madagascar
    731.4×
  102. 102MinneapolisMinnesota, United States
    731.4×
  103. 103CelayaGuanajuato, Mexico
    731.4×
  104. 104MadisonWisconsin, United States
    721.4×
  105. 104Red DeerAlberta, Canada
    721.4×
  106. 106Samut SakhonSamut Sakhon, Thailand
    721.4×
  107. 107AppletonWisconsin, United States
    721.3×
  108. 108TakanabeMiyazaki, Japan
    711.3×
  109. 109CórdobaAndalusia, Spain
    711.3×
  110. 109BailénAndalusia, Spain
    711.3×
  111. 109DetroitMichigan, United States
    711.3×
  112. 112WindsorOntario, Canada
    711.3×
  113. 113Bang Bo DistrictSamut Prakan, Thailand
    701.3×
  114. 113Franklin ParkIllinois, United States
    701.3×
  115. 115KalamazooMichigan, United States
    701.3×
  116. 116WaukeshaWisconsin, United States
    701.3×
  117. 117MilwaukeeWisconsin, United States
    701.3×
  118. 118JaénAndalusia, Spain
    691.3×
  119. 118GranadaAndalusia, Spain
    691.3×
  120. 120Grand RapidsMichigan, United States
    691.3×
  121. 121Calumet CityIllinois, United States
    691.3×
  122. 121NorthbrookIllinois, United States
    691.3×
  123. 123La Línea de la ConcepciónAndalusia, Spain
    691.2×
  124. 123Naucalpan de JuárezMéxico, Mexico
    691.2×
  125. 123Green BayWisconsin, United States
    691.2×
  126. 126JolietIllinois, United States
    691.2×
  127. 127YpsilantiMichigan, United States
    681.2×
  128. 128San Andrés TuxtlaVeracruz, Mexico
    681.2×
  129. 128La CrosseWisconsin, United States
    681.2×
  130. 130Phra PradaengSamut Prakan, Thailand
    681.2×
  131. 131Des PlainesIllinois, United States
    681.2×
  132. 132KasaokaOkayama, Japan
    671.2×
  133. 133DearbornMichigan, United States
    671.2×
  134. 133LondonOntario, Canada
    671.2×
  135. 135VigoGalicia, Spain
    671.2×
  136. 135TolucaMéxico, Mexico
    671.2×
  137. 135TocopillaAntofagasta, Chile
    671.2×
  138. 135JenisonMichigan, United States
    671.2×
  139. 139Wan ChaiWan Chai, Hong Kong
    661.2×
  140. 140RedmondOregon, United States
    661.2×
  141. 141NagoOkinawa, Japan
    661.1×
  142. 141St. ThomasOntario, Canada
    661.1×
  143. 143South MilwaukeeWisconsin, United States
    661.1×
  144. 144MonterreyNuevo León, Mexico
    661.1×
  145. 145Kathmandulow-cost sensorsBagmati Province, Nepal
    651.1×
  146. 145Port HuronMichigan, United States
    651.1×
  147. 145SarniaOntario, Canada
    651.1×
  148. 148OakvilleOntario, Canada
    651.1×
  149. 149BangkokBangkok, Thailand
    651.1×
  150. 149TamanoOkayama, Japan
    651.1×
  151. 149Fort LauderdaleFlorida, United States
    651.1×
  152. 149GuelphOntario, Canada
    651.1×
  153. 153NichinanMiyazaki, Japan
    651.1×
  154. 153AnanTokushima, Japan
    651.1×
  155. 155Torrejón de ArdozMadrid, Spain
    651.1×
  156. 155RockfordIllinois, United States
    651.1×
  157. 155South BendIndiana, United States
    651.1×
  158. 158PortageIndiana, United States
    641.1×
  159. 158Lincoln ParkMichigan, United States
    641.1×
  160. 158MiltonOntario, Canada
    641.1×
  161. 158WaterdownOntario, Canada
    641.1×
  162. 162Shakaskraallow-cost sensorsKwaZulu-Natal, South Africa
    641.1×
  163. 162CalamaAntofagasta, Chile
    641.1×
  164. 162MasonOhio, United States
    641.1×
  165. 162Saint CloudMinnesota, United States
    641.1×
  166. 166WatertownSouth Dakota, United States
    641.1×
  167. 166BrantfordOntario, Canada
    641.1×
  168. 168Khlong LuangPathum Thani, Thailand
    641.1×
  169. 168ClintonIowa, United States
    641.1×
  170. 168CaryIllinois, United States
    641.1×
  171. 168East ChicagoIndiana, United States
    641.1×
  172. 172SliemaTas-Sliema, Malta
    631.1×
  173. 172NapervilleIllinois, United States
    631.1×
  174. 172Jardines de la SillaNuevo León, Mexico
    631.1×
  175. 175CranbrookBritish Columbia, Canada
    631.0×
  176. 176LansingMichigan, United States
    631.0×
  177. 177SalamancaCastille and León, Spain
    631.0×
  178. 177PhiladelphiaPennsylvania, United States
    631.0×
  179. 177ChathamOntario, Canada
    631.0×
  180. 177KitchenerOntario, Canada
    631.0×
  181. 181San Miguel de AllendeGuanajuato, Mexico
    631.0×
  182. 181SalamancaGuanajuato, Mexico
    631.0×
  183. 181PeoriaIllinois, United States
    631.0×
  184. 184Gasteiz / VitoriaBasque Country, Spain
    631.0×
  185. 184Ciudad JuárezChihuahua, Mexico
    631.0×
  186. 184HamiltonOntario, Canada
    631.0×
  187. 187Nakhon PathomNakhon Pathom, Thailand
    621.0×
  188. 187San RoqueAndalusia, Spain
    621.0×
  189. 187BurgosCastille and León, Spain
    621.0×
  190. 190Narutochō-mitsuishiTokushima, Japan
    621.0×
  191. 190OkinawaOkinawa, Japan
    621.0×
  192. 190San Luis de la PazGuanajuato, Mexico
    621.0×
  193. 193KochiKochi, Japan
    621.0×
  194. 193HammondIndiana, United States
    621.0×
  195. 193TaylorMichigan, United States
    621.0×
  196. 196GuanajuatoGuanajuato, Mexico
    621.0×
  197. 196NewarkDelaware, United States
    621.0×
  198. 196GaryIndiana, United States
    621.0×
  199. 196Saint MichaelMinnesota, United States
    621.0×
  200. 196BensalemPennsylvania, United States
    621.0×

Top 200 of 1,793 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

Use this board

SmogRank, most polluted cities, PM2.5, August 9, 2023, smogrank.com/history/2023-08-09 (accessed 2 Oct 2026).

Download top 10 (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.