SmogRank / History / September 3, 2023

Most polluted cities on September 3, 2023

1,972 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 September 3, 2023. All episodes.

← Piedras Negras 986.0 µg/m³ 900 µg/m³15 WHO 24-hour guideline
Every city ranked for September 3, 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
    500+23.6×
  3. 3SaskatoonSaskatchewan, Canada
    39018.0×
  4. 4Fort McMurrayAlberta, Canada
    36817.3×
  5. 5EdmontonAlberta, Canada
    27613.4×
  6. 6Grande PrairieAlberta, Canada
    23510.7×
  7. 7CandelariaCanary Islands, Spain
    2169.4×
  8. 8Fort St. JohnBritish Columbia, Canada
    2119.1×
  9. 9Sherwood ParkAlberta, Canada
    1927.6×
  10. 10Red DeerAlberta, Canada
    1907.4×
  11. 11ReginaSaskatchewan, Canada
    1887.2×
  12. 12OsornoLos Lagos Region, Chile
    1856.9×
  13. 12St. AlbertAlberta, Canada
    1856.9×
  14. 14BloemfonteinFree State, South Africa
    1786.3×
  15. 15ZapopanJalisco, Mexico
    1715.6×
  16. 16La UniónLos Ríos Region, Chile
    1624.8×
  17. 17Puerto MonttLos Lagos Region, Chile
    1614.6×
  18. 18Kampalalow-cost sensorsCentral Region, Uganda
    1604.6×
  19. 19Swift CurrentSaskatchewan, Canada
    1604.6×
  20. 20Dhakalow-cost sensorsDhaka Division, Bangladesh
    1574.3×
  21. 21DushanbeDushanbe, Tajikistan
    1574.3×
  22. 22CalgaryAlberta, Canada
    1564.2×
  23. 23AirdrieAlberta, Canada
    1533.9×
  24. 24Puerto VarasLos Lagos Region, Chile
    1533.9×
  25. 25VereenigingGauteng, South Africa
    1523.8×
  26. 26KigaliKigali, Rwanda
    1473.6×
  27. 27CoyhaiqueAysén, Chile
    1453.6×
  28. 27KamloopsBritish Columbia, Canada
    1453.6×
  29. 29JakartaJakarta, Indonesia
    1363.3×
  30. 30Lahorelow-cost sensorsPunjab, Pakistan
    1263.0×
  31. 31BrakpanGauteng, South Africa
    1253.0×
  32. 32KolkataWest Bengal, India
    1233.0×
  33. 33HualquiBiobio, Chile
    1212.9×
  34. 34BrandonManitoba, Canada
    1212.9×
  35. 35ThembisaGauteng, South Africa
    1202.9×
  36. 36Puerto AysénAysén, Chile
    1192.9×
  37. 37CosladaMadrid, Spain
    1182.8×
  38. 38Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1152.7×
  39. 39HanoiHanoi, Vietnam
    1132.7×
  40. 40TalcahuanoBiobio, Chile
    1072.5×
  41. 41StilfonteinNorth West, South Africa
    1062.5×
  42. 42EvatonGauteng, South Africa
    1052.5×
  43. 42Victoria de DurangoDurango, Mexico
    1052.5×
  44. 44San CarlosÑuble, Chile
    1052.5×
  45. 45BeijingBeijing, China
    1032.4×
  46. 46Prince GeorgeBritish Columbia, Canada
    1002.4×
  47. 47Addis AbabaAddis Ababa, Ethiopia
    992.3×
  48. 48DelhiDelhi, India
    992.3×
  49. 49MexicaliBaja California, Mexico
    982.3×
  50. 50TemucoAraucania, Chile
    972.3×
  51. 51Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    972.3×
  52. 52Puente AltoSantiago Metropolitan, Chile
    952.2×
  53. 53SantiagoSantiago Metropolitan, Chile
    942.2×
  54. 54CoronelBiobio, Chile
    932.1×
  55. 55SarajevoFederation of B&H, Bosnia and Herzegovina
    932.1×
  56. 56ToméBiobio, Chile
    932.1×
  57. 57TlaquepaqueJalisco, Mexico
    922.1×
  58. 58Ga-RankuwaNorth West, South Africa
    912.0×
  59. 59PinetownKwaZulu-Natal, South Africa
    902.0×
  60. 60RengoO'Higgins Region, Chile
    892.0×
  61. 61QuillotaValparaiso, Chile
    892.0×
  62. 62PristinaPristina, Kosovo
    892.0×
  63. 62Ulu BedokSingapore
    892.0×
  64. 64DurbanKwaZulu-Natal, South Africa
    881.9×
  65. 65RancaguaO'Higgins Region, Chile
    881.9×
  66. 66ValdiviaLos Ríos Region, Chile
    871.9×
  67. 66CuranilahueBiobio, Chile
    871.9×
  68. 68BakuBaki, Azerbaijan
    861.9×
  69. 69LimaLima Province, Peru
    861.9×
  70. 70San Pedro de la PazBiobio, Chile
    851.8×
  71. 71XonacatlánMéxico, Mexico
    851.8×
  72. 72CuricóMaule Region, Chile
    841.8×
  73. 73San Francisco TlalcilalcalpanMéxico, Mexico
    831.8×
  74. 73Los ÁngelesBiobio, Chile
    831.8×
  75. 75ChillánÑuble, Chile
    821.7×
  76. 76ChiguayanteBiobio, Chile
    821.7×
  77. 77Ang Mo Kio New TownSingapore
    811.7×
  78. 78NairobiNairobi County, Kenya
    811.7×
  79. 79Lop BuriLopburi, Thailand
    801.6×
  80. 79Ciudad ApodacaNuevo León, Mexico
    801.6×
  81. 81Kuala LumpurKuala Lumpur, Malaysia
    791.6×
  82. 82Medicine HatAlberta, Canada
    791.6×
  83. 83TalaganteSantiago Metropolitan, Chile
    791.6×
  84. 84West FargoNorth Dakota, United States
    781.6×
  85. 85ConcepciónBiobio, Chile
    781.6×
  86. 86ShenyangLiaoning, China
    771.5×
  87. 87DunkirkHauts-de-France, France
    771.5×
  88. 88San Salvador TizatlalliMéxico, Mexico
    771.5×
  89. 89Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    761.5×
  90. 90JeddahMecca Region, Saudi Arabia
    761.5×
  91. 90Bang NaBangkok, Thailand
    761.5×
  92. 92AntofagastaAntofagasta, Chile
    751.5×
  93. 93Samut SakhonSamut Sakhon, Thailand
    751.5×
  94. 93Ban Samae DamBangkok, Thailand
    751.5×
  95. 93QuinteroValparaiso, Chile
    751.5×
  96. 96CauquenesMaule Region, Chile
    751.5×
  97. 96Khlong Sam WaBangkok, Thailand
    751.5×
  98. 98HyderabadTelangana, India
    751.5×
  99. 98GuadalajaraJalisco, Mexico
    751.5×
  100. 100Queenstown Estatelow-cost sensorsSingapore
    741.4×
  101. 100Ciudad JuárezChihuahua, Mexico
    741.4×
  102. 102Nong KhaemBangkok, Thailand
    741.4×
  103. 102Wan ChaiWan Chai, Hong Kong
    741.4×
  104. 102RoeselareFlanders, Belgium
    741.4×
  105. 102LilleHauts-de-France, France
    741.4×
  106. 102ConcónValparaiso, Chile
    741.4×
  107. 107Torrejón de ArdozMadrid, Spain
    741.4×
  108. 108Suphan BuriSuphan Buri, Thailand
    741.4×
  109. 108Le RobertMartinique, Martinique
    741.4×
  110. 108AricaArica y Parinacota Region, Chile
    741.4×
  111. 111KortrijkFlanders, Belgium
    741.4×
  112. 111TolucaMéxico, Mexico
    741.4×
  113. 113LotaBiobio, Chile
    731.4×
  114. 114Si Sa KetSi Sa Ket, Thailand
    731.4×
  115. 115Santa Anita - Los FicusLima region, Peru
    731.4×
  116. 116TalcaMaule Region, Chile
    731.4×
  117. 117Karachilow-cost sensorsSindh, Pakistan
    721.4×
  118. 117Sing BuriSing Buri, Thailand
    721.4×
  119. 119MukdahanMukdahan, Thailand
    721.4×
  120. 119BamakoBamako, Mali
    721.4×
  121. 119MadridMadrid, Spain
    721.4×
  122. 122N'DjamenaN’Djaména, Chad
    721.4×
  123. 122JenksOklahoma, United States
    721.4×
  124. 124Kathmandulow-cost sensorsBagmati Province, Nepal
    721.4×
  125. 124Fort-de-FranceMartinique, Martinique
    721.4×
  126. 124Ciudad Benito JuárezNuevo León, Mexico
    721.4×
  127. 127Le LamentinMartinique, Martinique
    721.3×
  128. 128Si Maha PhotPrachin Buri, Thailand
    711.3×
  129. 128RoubaixHauts-de-France, France
    711.3×
  130. 128Sai MaiBangkok, Thailand
    711.3×
  131. 131Santa CatarinaNuevo León, Mexico
    711.3×
  132. 132IzegemFlanders, Belgium
    711.3×
  133. 132CuernavacaMorelos, Mexico
    711.3×
  134. 134SalorTashkent Region, Uzbekistan
    711.3×
  135. 134Naucalpan de JuárezMéxico, Mexico
    711.3×
  136. 134Khan Na YaoBangkok, Thailand
    711.3×
  137. 137KanchanaburiKanchanaburi, Thailand
    711.3×
  138. 138Viña del MarValparaiso, Chile
    701.3×
  139. 138SalamancaGuanajuato, Mexico
    701.3×
  140. 138Gómez PalacioDurango, Mexico
    701.3×
  141. 141KoksijdeFlanders, Belgium
    701.3×
  142. 141KadaňÚstí nad Labem Region, Czechia
    701.3×
  143. 143PietermaritzburgKwaZulu-Natal, South Africa
    701.3×
  144. 143MenenFlanders, Belgium
    701.3×
  145. 145Khlong LuangPathum Thani, Thailand
    701.3×
  146. 145Lat KrabangBangkok, Thailand
    701.3×
  147. 147IwataShizuoka, Japan
    691.3×
  148. 147Ciudad NezahualcoyotlMéxico, Mexico
    691.3×
  149. 147Thunder BayOntario, Canada
    691.3×
  150. 150Lak SiBangkok, Thailand
    691.3×
  151. 151SaraburiSaraburi, Thailand
    691.3×
  152. 152GuangzhouGuangdong, China
    691.2×
  153. 152CoquimboCoquimbo Region, Chile
    691.2×
  154. 152Bueng KumBangkok, Thailand
    691.2×
  155. 155TocopillaAntofagasta, Chile
    691.2×
  156. 156TulsaOklahoma, United States
    681.2×
  157. 157NagaiYamagata, Japan
    681.2×
  158. 158WaregemFlanders, Belgium
    681.2×
  159. 158TournaiWallonia, Belgium
    681.2×
  160. 158LethbridgeAlberta, Canada
    681.2×
  161. 161Udon ThaniUdon Thani, Thailand
    681.2×
  162. 161ValenciennesHauts-de-France, France
    681.2×
  163. 163EvergemFlanders, Belgium
    671.2×
  164. 164BangkokBangkok, Thailand
    671.2×
  165. 165Nakhon RatchasimaNakhon Ratchasima, Thailand
    671.2×
  166. 165CopiapóAtacama, Chile
    671.2×
  167. 165CelayaGuanajuato, Mexico
    671.2×
  168. 165IndioCalifornia, United States
    671.2×
  169. 169Phra PradaengSamut Prakan, Thailand
    661.2×
  170. 170Ubon RatchathaniUbon Ratchathani, Thailand
    661.2×
  171. 170IyoEhime, Japan
    661.2×
  172. 170MonsWallonia, Belgium
    661.2×
  173. 170CalamaAntofagasta, Chile
    661.2×
  174. 174DuluthMinnesota, United States
    661.1×
  175. 175Mexico CityMexico City, Mexico
    661.1×
  176. 176ChennaiTamil Nadu, India
    661.1×
  177. 176DerbyKansas, United States
    661.1×
  178. 178Ponca CityOklahoma, United States
    661.1×
  179. 179DieppeNormandy, France
    651.1×
  180. 179MonterreyNuevo León, Mexico
    651.1×
  181. 181Samut PrakanSamut Prakan, Thailand
    651.1×
  182. 182BitolaBitola, North Macedonia
    651.1×
  183. 182Nakhon SawanNakhon Sawan, Thailand
    651.1×
  184. 182Alto HospicioTarapacá, Chile
    651.1×
  185. 182WichitaKansas, United States
    651.1×
  186. 186MaldegemFlanders, Belgium
    651.1×
  187. 186McAlesterOklahoma, United States
    651.1×
  188. 188Bang KapiBangkok, Thailand
    641.1×
  189. 188BrusselsBrussels Capital, Belgium
    641.1×
  190. 190Nakhon PathomNakhon Pathom, Thailand
    641.1×
  191. 190UžiceCentral Serbia, Serbia
    641.1×
  192. 192Tula de AllendeHidalgo, Mexico
    641.1×
  193. 192Villa Poeta José Gálvez BarrenecheaLima region, Peru
    641.1×
  194. 194Mae SaiChiang Rai, Thailand
    641.1×
  195. 194PhetchabunPhetchabun, Thailand
    641.1×
  196. 194TakasakiGunma, Japan
    641.1×
  197. 194SuperiorWisconsin, United States
    641.1×
  198. 198DenainHauts-de-France, France
    641.1×
  199. 198Fort WorthTexas, United States
    641.1×
  200. 200MumbaiMaharashtra, India
    631.1×

Top 200 of 1,972 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, September 3, 2023, smogrank.com/history/2023-09-03 (accessed 2 Oct 2026).

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