SmogRank / History / August 15, 2023

Most polluted cities on August 15, 2023

1,922 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 15, 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. 2Prince AlbertSaskatchewan, Canada
    1907.4×
  3. 3BloemfonteinFree State, South Africa
    1796.3×
  4. 4NacimientoBiobio, Chile
    1786.3×
  5. 5SaskatoonSaskatchewan, Canada
    1756.0×
  6. 6LinaresMaule Region, Chile
    1695.5×
  7. 7RedmondOregon, United States
    1695.4×
  8. 8EtwatwaGauteng, South Africa
    1695.4×
  9. 9Greater SudburyOntario, Canada
    1685.3×
  10. 10North BayOntario, Canada
    1665.1×
  11. 11Dhakalow-cost sensorsDhaka Division, Bangladesh
    1665.1×
  12. 12Los ÁngelesBiobio, Chile
    1614.7×
  13. 13SaltilloCoahuila, Mexico
    1604.6×
  14. 14San CarlosÑuble, Chile
    1604.6×
  15. 15EugeneOregon, United States
    1544.0×
  16. 16KolkataWest Bengal, India
    1483.6×
  17. 17JohannesburgGauteng, South Africa
    1463.6×
  18. 18ThembisaGauteng, South Africa
    1453.6×
  19. 19ChillánÑuble, Chile
    1443.5×
  20. 20CoyhaiqueAysén, Chile
    1423.5×
  21. 21MafikengNorth West, South Africa
    1423.5×
  22. 22TalcaMaule Region, Chile
    1363.3×
  23. 23PretoriaGauteng, South Africa
    1343.2×
  24. 24VernonBritish Columbia, Canada
    1323.2×
  25. 25HualquiBiobio, Chile
    1313.2×
  26. 26BalfourMpumalanga, South Africa
    1293.1×
  27. 27BakuBaki, Azerbaijan
    1253.0×
  28. 28CauquenesMaule Region, Chile
    1243.0×
  29. 29VereenigingGauteng, South Africa
    1172.8×
  30. 30N'DjamenaN’Djaména, Chad
    1162.8×
  31. 31DushanbeDushanbe, Tajikistan
    1152.8×
  32. 32CuricóMaule Region, Chile
    1152.7×
  33. 33CoronelBiobio, Chile
    1142.7×
  34. 34Kampalalow-cost sensorsCentral Region, Uganda
    1132.7×
  35. 35Addis AbabaAddis Ababa, Ethiopia
    1122.7×
  36. 36AnconaThe Marches, Italy
    1122.7×
  37. 37CuranilahueBiobio, Chile
    1112.6×
  38. 38DelhiDelhi, India
    1102.6×
  39. 39KamloopsBritish Columbia, Canada
    1042.5×
  40. 40AlexandriaAlexandria, Egypt
    1042.5×
  41. 41BrakpanGauteng, South Africa
    1022.4×
  42. 42JakartaJakarta, Indonesia
    1012.4×
  43. 43TokozaGauteng, South Africa
    1002.4×
  44. 44HartbeespoortNorth West, South Africa
    1002.4×
  45. 45Puerto VarasLos Lagos Region, Chile
    992.3×
  46. 46ReginaSaskatchewan, Canada
    992.3×
  47. 47Santa Anita - Los FicusLima region, Peru
    992.3×
  48. 48LimaLima Province, Peru
    962.2×
  49. 49MiddelburgMpumalanga, South Africa
    952.2×
  50. 49TemucoAraucania, Chile
    952.2×
  51. 51MexicaliBaja California, Mexico
    952.2×
  52. 52ChennaiTamil Nadu, India
    942.2×
  53. 53SantiagoSantiago Metropolitan, Chile
    942.1×
  54. 54Şabāḩ as SālimMubārak al Kabīr, Kuwait
    932.1×
  55. 55ThabazimbiLimpopo, South Africa
    932.1×
  56. 56BendOregon, United States
    922.1×
  57. 57EmalahleniMpumalanga, South Africa
    922.1×
  58. 58BrookingsSouth Dakota, United States
    922.1×
  59. 59Puerto AysénAysén, Chile
    922.1×
  60. 60KigaliKigali, Rwanda
    912.0×
  61. 61BarrieOntario, Canada
    902.0×
  62. 62RancaguaO'Higgins Region, Chile
    902.0×
  63. 62La UniónLos Ríos Region, Chile
    902.0×
  64. 64Puerto MonttLos Lagos Region, Chile
    892.0×
  65. 64AlbanyOregon, United States
    892.0×
  66. 66Puente AltoSantiago Metropolitan, Chile
    881.9×
  67. 67StilfonteinNorth West, South Africa
    881.9×
  68. 67Abujalow-cost sensorsFCT, Nigeria
    881.9×
  69. 69Lahorelow-cost sensorsPunjab, Pakistan
    871.9×
  70. 70OsornoLos Lagos Region, Chile
    871.9×
  71. 71SasolburgFree State, South Africa
    871.9×
  72. 72TalaganteSantiago Metropolitan, Chile
    861.9×
  73. 73ŻabbarĦaż-Żabbar, Malta
    861.9×
  74. 73MarikanaNorth West, South Africa
    861.9×
  75. 75JesiThe Marches, Italy
    851.8×
  76. 76ErmeloMpumalanga, South Africa
    841.8×
  77. 77Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    841.8×
  78. 78Le RobertMartinique, Martinique
    831.8×
  79. 79VanderbijlparkGauteng, South Africa
    821.7×
  80. 80Le LamentinMartinique, Martinique
    821.7×
  81. 81PristinaPristina, Kosovo
    821.7×
  82. 82BeijingBeijing, China
    811.7×
  83. 83FujinomiyaShizuoka, Japan
    811.7×
  84. 84Ban Samae DamBangkok, Thailand
    811.7×
  85. 85ToméBiobio, Chile
    811.7×
  86. 86TlaquepaqueJalisco, Mexico
    801.6×
  87. 87RengoO'Higgins Region, Chile
    801.6×
  88. 87ChiguayanteBiobio, Chile
    801.6×
  89. 89Lop BuriLopburi, Thailand
    791.6×
  90. 90Karachilow-cost sensorsSindh, Pakistan
    791.6×
  91. 91LotaBiobio, Chile
    781.6×
  92. 91PentictonBritish Columbia, Canada
    781.6×
  93. 93LoeiLoei, Thailand
    781.6×
  94. 93SarajevoFederation of B&H, Bosnia and Herzegovina
    781.6×
  95. 95Fort-de-FranceMartinique, Martinique
    781.6×
  96. 96Islamabadlow-cost sensorsIslamabad, Pakistan
    771.6×
  97. 96SenicaTrnava Region, Slovakia
    771.6×
  98. 98NanNan, Thailand
    771.5×
  99. 98Falconara MarittimaThe Marches, Italy
    771.5×
  100. 100GuangzhouGuangdong, China
    771.5×
  101. 100San Francisco TlalcilalcalpanMéxico, Mexico
    771.5×
  102. 102LampangLampang, Thailand
    771.5×
  103. 103Rouyn-NorandaQuebec, Canada
    761.5×
  104. 104Saphan SungBangkok, Thailand
    761.5×
  105. 105TobaMie, Japan
    761.5×
  106. 106Viña del MarValparaiso, Chile
    751.5×
  107. 107Bang NaBangkok, Thailand
    751.5×
  108. 108Bay CityMichigan, United States
    751.5×
  109. 109Si Maha PhotPrachin Buri, Thailand
    751.5×
  110. 110Grand RapidsMichigan, United States
    741.4×
  111. 111Udon ThaniUdon Thani, Thailand
    741.4×
  112. 111Nakhon RatchasimaNakhon Ratchasima, Thailand
    741.4×
  113. 113NairobiNairobi County, Kenya
    741.4×
  114. 113HollandMichigan, United States
    741.4×
  115. 115XonacatlánMéxico, Mexico
    741.4×
  116. 115ValdiviaLos Ríos Region, Chile
    741.4×
  117. 117ShenyangLiaoning, China
    731.4×
  118. 118HanoiHanoi, Vietnam
    731.4×
  119. 118AntofagastaAntofagasta, Chile
    731.4×
  120. 120TalcahuanoBiobio, Chile
    731.4×
  121. 120RoseburgOregon, United States
    731.4×
  122. 122AlgiersAlgiers, Algeria
    731.4×
  123. 122KadaňÚstí nad Labem Region, Czechia
    731.4×
  124. 124PhetchabunPhetchabun, Thailand
    731.4×
  125. 124Nong KhaemBangkok, Thailand
    731.4×
  126. 124TrnavaTrnava Region, Slovakia
    731.4×
  127. 127Samut SakhonSamut Sakhon, Thailand
    721.4×
  128. 127DěčínÚstí nad Labem Region, Czechia
    721.4×
  129. 127QuillotaValparaiso, Chile
    721.4×
  130. 130Chiang MaiChiang Mai, Thailand
    721.4×
  131. 131SalemOregon, United States
    721.4×
  132. 131San Salvador TizatlalliMéxico, Mexico
    721.4×
  133. 133WolfsbergCarinthia, Austria
    721.4×
  134. 134ShimodaShizuoka, Japan
    711.3×
  135. 134BratislavaBratislava Region, Slovakia
    711.3×
  136. 136TaharaAichi, Japan
    711.3×
  137. 137EdmontonAlberta, Canada
    711.3×
  138. 138Banja LukaSrpska, Bosnia and Herzegovina
    711.3×
  139. 138JenisonMichigan, United States
    711.3×
  140. 138Red DeerAlberta, Canada
    711.3×
  141. 141PrešovPrešov Region, Slovakia
    711.3×
  142. 141HyderabadTelangana, India
    711.3×
  143. 141Phra PradaengSamut Prakan, Thailand
    711.3×
  144. 141KikugawaShizuoka, Japan
    711.3×
  145. 145TolucaMéxico, Mexico
    701.3×
  146. 145QuinteroValparaiso, Chile
    701.3×
  147. 145ConcónValparaiso, Chile
    701.3×
  148. 145TigardOregon, United States
    701.3×
  149. 145AyaseKanagawa, Japan
    701.3×
  150. 150Ga-RankuwaNorth West, South Africa
    701.3×
  151. 150KrakówLesser Poland, Poland
    701.3×
  152. 152Victoria de DurangoDurango, Mexico
    701.3×
  153. 152Khan Na YaoBangkok, Thailand
    701.3×
  154. 154MostÚstí nad Labem Region, Czechia
    701.3×
  155. 154PeoriaIllinois, United States
    701.3×
  156. 154Khlong Sam WaBangkok, Thailand
    701.3×
  157. 157DurbanKwaZulu-Natal, South Africa
    691.3×
  158. 158RuseRuse, Bulgaria
    691.3×
  159. 159Villa Poeta José Gálvez BarrenecheaLima region, Peru
    691.3×
  160. 159Prince GeorgeBritish Columbia, Canada
    691.3×
  161. 159LephalaleLimpopo, South Africa
    691.3×
  162. 162KanchanaburiKanchanaburi, Thailand
    691.2×
  163. 162FukuroiShizuoka, Japan
    691.2×
  164. 162PeterboroughOntario, Canada
    691.2×
  165. 165ĆuprijaCentral Serbia, Serbia
    691.2×
  166. 166SukhothaiSukhothai, Thailand
    691.2×
  167. 166SaraburiSaraburi, Thailand
    691.2×
  168. 166ShimaMie, Japan
    691.2×
  169. 166Lagoslow-cost sensorsLagos, Nigeria
    691.2×
  170. 166KladnoCentral Bohemia, Czechia
    691.2×
  171. 171ObrenovacCentral Serbia, Serbia
    681.2×
  172. 171PinetownKwaZulu-Natal, South Africa
    681.2×
  173. 173Vranov nad TopľouPrešov Region, Slovakia
    681.2×
  174. 173Kathmandulow-cost sensorsBagmati Province, Nepal
    681.2×
  175. 173Bang Bo DistrictSamut Prakan, Thailand
    681.2×
  176. 173MiuraKanagawa, Japan
    681.2×
  177. 177KragujevacCentral Serbia, Serbia
    681.2×
  178. 177NumazuShizuoka, Japan
    681.2×
  179. 177HamamatsuShizuoka, Japan
    681.2×
  180. 180ConcepciónBiobio, Chile
    681.2×
  181. 181NiskoSubcarpathia, Poland
    681.2×
  182. 181ŌmeTokyo, Japan
    681.2×
  183. 181MinamirinkanKanagawa, Japan
    681.2×
  184. 181ChigasakiKanagawa, Japan
    681.2×
  185. 185Mae SaiChiang Rai, Thailand
    671.2×
  186. 185BangkokBangkok, Thailand
    671.2×
  187. 185MostaIl-Mosta, Malta
    671.2×
  188. 185NitraNitra Region, Slovakia
    671.2×
  189. 185UžiceCentral Serbia, Serbia
    671.2×
  190. 185San Francisco De BorjaLima region, Peru
    671.2×
  191. 191ColomboWestern Province, Sri Lanka
    671.2×
  192. 191KiryūGunma, Japan
    671.2×
  193. 193PhraePhrae, Thailand
    671.2×
  194. 193MukdahanMukdahan, Thailand
    671.2×
  195. 193ShimadaShizuoka, Japan
    671.2×
  196. 193AiharaKanagawa, Japan
    671.2×
  197. 193LitvínovÚstí nad Labem Region, Czechia
    671.2×
  198. 198RatchaburiRatchaburi, Thailand
    671.2×
  199. 198Klagenfurt am WörtherseeCarinthia, Austria
    671.2×
  200. 198Alto HospicioTarapacá, Chile
    671.2×

Top 200 of 1,922 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, August 15, 2023, smogrank.com/history/2023-08-15 (accessed 2 Oct 2026).

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