SmogRank / History / August 17, 2023

Most polluted cities on August 17, 2023

1,892 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.

Bad-air episodes during August 17, 2023. All episodes.

← Piedras Negras 986.0 µg/m³ 900 µg/m³15 WHO 24-hour guideline
Every city ranked for August 17, 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. 2AshlandOregon, United States
    2068.7×
  3. 3CranbrookBritish Columbia, Canada
    1856.9×
  4. 4CoyhaiqueAysén, Chile
    1836.8×
  5. 5MedfordOregon, United States
    1786.3×
  6. 6VernonBritish Columbia, Canada
    1776.2×
  7. 7PentictonBritish Columbia, Canada
    1776.2×
  8. 8KamloopsBritish Columbia, Canada
    1705.5×
  9. 9KelheimBavaria, Germany
    1584.4×
  10. 10Dhakalow-cost sensorsDhaka Division, Bangladesh
    1554.1×
  11. 11Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1523.8×
  12. 12KelownaBritish Columbia, Canada
    1443.5×
  13. 13Kampalalow-cost sensorsCentral Region, Uganda
    1403.4×
  14. 14Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1383.4×
  15. 14Grants PassOregon, United States
    1383.4×
  16. 16SarajevoFederation of B&H, Bosnia and Herzegovina
    1383.4×
  17. 17RedmondOregon, United States
    1373.4×
  18. 18CalgaryAlberta, Canada
    1353.3×
  19. 19ManamaManama, Bahrain
    1323.2×
  20. 20BendOregon, United States
    1313.2×
  21. 21DushanbeDushanbe, Tajikistan
    1273.1×
  22. 22Lahorelow-cost sensorsPunjab, Pakistan
    1253.0×
  23. 23KigaliKigali, Rwanda
    1212.9×
  24. 24Puerto VarasLos Lagos Region, Chile
    1202.9×
  25. 25NacimientoBiobio, Chile
    1152.7×
  26. 26HelenaMontana, United States
    1152.7×
  27. 27KolkataWest Bengal, India
    1142.7×
  28. 27HanoiHanoi, Vietnam
    1142.7×
  29. 29AlexandriaAlexandria, Egypt
    1132.7×
  30. 30LethbridgeAlberta, Canada
    1122.7×
  31. 31MexicaliBaja California, Mexico
    1062.5×
  32. 32Moses LakeWashington, United States
    1052.5×
  33. 33Islamabadlow-cost sensorsIslamabad, Pakistan
    1022.4×
  34. 34Shakaskraallow-cost sensorsKwaZulu-Natal, South Africa
    1022.4×
  35. 35DelhiDelhi, India
    1002.4×
  36. 36Puerto MonttLos Lagos Region, Chile
    992.3×
  37. 37AirdrieAlberta, Canada
    982.3×
  38. 38ShenyangLiaoning, China
    962.2×
  39. 38CatañoCataño, Puerto Rico
    962.2×
  40. 40RancaguaO'Higgins Region, Chile
    962.2×
  41. 41RengoO'Higgins Region, Chile
    952.2×
  42. 42Medicine HatAlberta, Canada
    942.2×
  43. 43Rose HillVirginia, United States
    942.1×
  44. 44PristinaPristina, Kosovo
    942.1×
  45. 45GuangzhouGuangdong, China
    902.0×
  46. 46La UniónLos Ríos Region, Chile
    902.0×
  47. 47ChennaiTamil Nadu, India
    902.0×
  48. 47West FargoNorth Dakota, United States
    902.0×
  49. 49TemucoAraucania, Chile
    892.0×
  50. 50ButteMontana, United States
    892.0×
  51. 51EdmontonAlberta, Canada
    881.9×
  52. 52Puerto AysénAysén, Chile
    881.9×
  53. 53Ciudad ApodacaNuevo León, Mexico
    881.9×
  54. 54Red DeerAlberta, Canada
    871.9×
  55. 55Addis AbabaAddis Ababa, Ethiopia
    871.9×
  56. 56AugustówPodlasie, Poland
    871.9×
  57. 57CoronelBiobio, Chile
    861.9×
  58. 58BeijingBeijing, China
    861.9×
  59. 59ValdiviaLos Ríos Region, Chile
    861.8×
  60. 60HyderabadTelangana, India
    851.8×
  61. 61HualquiBiobio, Chile
    851.8×
  62. 62LewistonIdaho, United States
    841.8×
  63. 63N'DjamenaN’Djaména, Chad
    831.8×
  64. 64CuranilahueBiobio, Chile
    821.7×
  65. 65AnconaThe Marches, Italy
    821.7×
  66. 66BrookingsSouth Dakota, United States
    821.7×
  67. 66Great FallsMontana, United States
    821.7×
  68. 68MoscowIdaho, United States
    811.7×
  69. 69Marche-en-FamenneWallonia, Belgium
    811.7×
  70. 70Coeur d'AleneIdaho, United States
    801.6×
  71. 70Prince GeorgeBritish Columbia, Canada
    801.6×
  72. 72Puente AltoSantiago Metropolitan, Chile
    791.6×
  73. 73SantiagoSantiago Metropolitan, Chile
    791.6×
  74. 73CauquenesMaule Region, Chile
    791.6×
  75. 73Swift CurrentSaskatchewan, Canada
    791.6×
  76. 76LublinLublin, Poland
    791.6×
  77. 77CoquimboCoquimbo Region, Chile
    781.6×
  78. 78JeddahMecca Region, Saudi Arabia
    781.6×
  79. 78Samut SakhonSamut Sakhon, Thailand
    781.6×
  80. 80SalorTashkent Region, Uzbekistan
    771.5×
  81. 81ZamośćLublin, Poland
    771.5×
  82. 81DuluthMinnesota, United States
    771.5×
  83. 83BelgradeCentral Serbia, Serbia
    761.5×
  84. 84LiègeWallonia, Belgium
    761.5×
  85. 84AntofagastaAntofagasta, Chile
    761.5×
  86. 86Wan ChaiWan Chai, Hong Kong
    761.5×
  87. 86FujinomiyaShizuoka, Japan
    761.5×
  88. 88Ang Mo Kio New TownSingapore
    761.5×
  89. 88Santa CatarinaNuevo León, Mexico
    761.5×
  90. 90NairobiNairobi County, Kenya
    761.5×
  91. 90SpokaneWashington, United States
    761.5×
  92. 92NišCentral Serbia, Serbia
    751.5×
  93. 93PullmanWashington, United States
    751.5×
  94. 93NewmarketOntario, Canada
    751.5×
  95. 95TalaganteSantiago Metropolitan, Chile
    751.5×
  96. 95MissoulaMontana, United States
    751.5×
  97. 97NiskoSubcarpathia, Poland
    751.5×
  98. 97Spokane ValleyWashington, United States
    751.5×
  99. 97BarrieOntario, Canada
    751.5×
  100. 97OakvilleOntario, Canada
    751.5×
  101. 101SuperiorWisconsin, United States
    741.4×
  102. 101GuelphOntario, Canada
    741.4×
  103. 103NampaIdaho, United States
    741.4×
  104. 104Santa Anita - Los FicusLima region, Peru
    741.4×
  105. 105Ulu BedokSingapore
    741.4×
  106. 105CuricóMaule Region, Chile
    741.4×
  107. 107QuillotaValparaiso, Chile
    741.4×
  108. 108RadomskoŁódź Voivodeship, Poland
    731.4×
  109. 109DębicaSubcarpathia, Poland
    731.4×
  110. 109Silao de la VictoriaGuanajuato, Mexico
    731.4×
  111. 111Ciudad Benito JuárezNuevo León, Mexico
    731.4×
  112. 112AndenneWallonia, Belgium
    731.4×
  113. 113Banja LukaSrpska, Bosnia and Herzegovina
    721.4×
  114. 114VilniusVilnius, Lithuania
    721.4×
  115. 114Le RobertMartinique, Martinique
    721.4×
  116. 114CopiapóAtacama, Chile
    721.4×
  117. 114SunnysideWashington, United States
    721.4×
  118. 114PeterboroughOntario, Canada
    721.4×
  119. 119KitchenerOntario, Canada
    721.4×
  120. 119MiltonOntario, Canada
    721.4×
  121. 121BakuBaki, Azerbaijan
    711.3×
  122. 121Fort-de-FranceMartinique, Martinique
    711.3×
  123. 121LimaLima Province, Peru
    711.3×
  124. 124SuwałkiPodlasie, Poland
    711.3×
  125. 124Flémalle-HauteWallonia, Belgium
    711.3×
  126. 126TetovoTetovo, North Macedonia
    711.3×
  127. 127CholulaPuebla, Mexico
    711.3×
  128. 127Ciudad JuárezChihuahua, Mexico
    711.3×
  129. 127MeridianIdaho, United States
    711.3×
  130. 130BramptonOntario, Canada
    711.3×
  131. 131São PauloSão Paulo, Brazil
    711.3×
  132. 131Saint CloudMinnesota, United States
    711.3×
  133. 131BrantfordOntario, Canada
    711.3×
  134. 134GrajewoPodlasie, Poland
    701.3×
  135. 135Le LamentinMartinique, Martinique
    701.3×
  136. 136Collado-VillalbaMadrid, Spain
    701.3×
  137. 136TorontoOntario, Canada
    701.3×
  138. 138GilletteWyoming, United States
    701.3×
  139. 139BiałystokPodlasie, Poland
    691.3×
  140. 139BitolaBitola, North Macedonia
    691.3×
  141. 139Nong KhaemBangkok, Thailand
    691.3×
  142. 142MississaugaOntario, Canada
    691.3×
  143. 143Tha BoNong Khai, Thailand
    691.3×
  144. 143XonacatlánMéxico, Mexico
    691.3×
  145. 145Karachilow-cost sensorsSindh, Pakistan
    691.2×
  146. 145JesiThe Marches, Italy
    691.2×
  147. 145Grande PrairieAlberta, Canada
    691.2×
  148. 148Viña del MarValparaiso, Chile
    691.2×
  149. 149Lagoslow-cost sensorsLagos, Nigeria
    691.2×
  150. 149Naucalpan de JuárezMéxico, Mexico
    691.2×
  151. 151PrzemyślSubcarpathia, Poland
    681.2×
  152. 151ChillánÑuble, Chile
    681.2×
  153. 153Tuen MunTuen Mun, Hong Kong
    681.2×
  154. 153ReginaSaskatchewan, Canada
    681.2×
  155. 153WaterdownOntario, Canada
    681.2×
  156. 156AntananarivoAnalamanga, Madagascar
    681.2×
  157. 156ModugnoApulia, Italy
    681.2×
  158. 156TocopillaAntofagasta, Chile
    681.2×
  159. 159NyíregyházaSzabolcs-Szatmár-Bereg, Hungary
    681.2×
  160. 159KadaňÚstí nad Labem Region, Czechia
    681.2×
  161. 159KrakówLesser Poland, Poland
    681.2×
  162. 159MonterreyNuevo León, Mexico
    681.2×
  163. 159Prince AlbertSaskatchewan, Canada
    681.2×
  164. 164KazincbarcikaBorsod-Abaúj-Zemplén, Hungary
    671.2×
  165. 164QuinteroValparaiso, Chile
    671.2×
  166. 164ClevelandOhio, United States
    671.2×
  167. 164Jardines de la SillaNuevo León, Mexico
    671.2×
  168. 168PrešovPrešov Region, Slovakia
    671.2×
  169. 168EupenWallonia, Belgium
    671.2×
  170. 168SenicaTrnava Region, Slovakia
    671.2×
  171. 168Falconara MarittimaThe Marches, Italy
    671.2×
  172. 172Alto HospicioTarapacá, Chile
    671.2×
  173. 172St. ThomasOntario, Canada
    671.2×
  174. 174Cadereyta JiménezNuevo León, Mexico
    671.2×
  175. 174TalcahuanoBiobio, Chile
    671.2×
  176. 174AricaArica y Parinacota Region, Chile
    671.2×
  177. 174HamiltonOntario, Canada
    671.2×
  178. 178ŁukówLublin, Poland
    661.2×
  179. 178Los ÁngelesBiobio, Chile
    661.2×
  180. 178CalamaAntofagasta, Chile
    661.2×
  181. 181San CarlosÑuble, Chile
    661.2×
  182. 181LondonOntario, Canada
    661.2×
  183. 183BratislavaBratislava Region, Slovakia
    661.1×
  184. 184AsprópyrgosAttica, Greece
    661.1×
  185. 185TakasakiGunma, Japan
    661.1×
  186. 186MinamataKumamoto, Japan
    661.1×
  187. 186MontemurloTuscany, Italy
    661.1×
  188. 188NagaiYamagata, Japan
    651.1×
  189. 188BéthuneHauts-de-France, France
    651.1×
  190. 188TrnavaTrnava Region, Slovakia
    651.1×
  191. 191ToméBiobio, Chile
    651.1×
  192. 191WatertownSouth Dakota, United States
    651.1×
  193. 193ColomboWestern Province, Sri Lanka
    651.1×
  194. 193Bang Bo DistrictSamut Prakan, Thailand
    651.1×
  195. 193IshinomakiMiyagi, Japan
    651.1×
  196. 193LitvínovÚstí nad Labem Region, Czechia
    651.1×
  197. 193Novi SadVojvodina, Serbia
    651.1×
  198. 193West MemphisArkansas, United States
    651.1×
  199. 199AthensAttica, Greece
    651.1×
  200. 199Tsuen WanTsuen Wan, Hong Kong
    651.1×

Top 200 of 1,892 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 17, 2023, smogrank.com/history/2023-08-17 (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.