SmogRank / History / September 2023

Most polluted cities, September 2023

1,830 cities ranked by their average PM2.5 over the 30 days; the worst was Tha Bo, Thailand, at 111.4 µg/m³. A city needs measurements on 70% of the days to be ranked.

  1. 1Tha BoNong Khai, Thailand
    111.4
  2. 2Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    90.8
  3. 3DushanbeDushanbe, Tajikistan
    61.0
  4. 4Fort McMurrayAlberta, Canada
    54.2
  5. 5Lahorelow-cost sensorsPunjab, Pakistan
    52.7
  6. 6Dhakalow-cost sensorsDhaka Division, Bangladesh
    47.2
  7. 7Grande PrairieAlberta, Canada
    46.1
  8. 8Prince AlbertSaskatchewan, Canada
    44.7
  9. 9EdmontonAlberta, Canada
    44.6
  10. 10JakartaJakarta, Indonesia
    44.4
  11. 11Şabāḩ as SālimMubārak al Kabīr, Kuwait
    41.4
  12. 12Fort St. JohnBritish Columbia, Canada
    41.3
  13. 13SaskatoonSaskatchewan, Canada
    40.4
  14. 14Kampalalow-cost sensorsCentral Region, Uganda
    39.9
  15. 15ReginaSaskatchewan, Canada
    38.8
  16. 16Addis AbabaAddis Ababa, Ethiopia
    37.5
  17. 17DelhiDelhi, India
    35.2
  18. 18BeijingBeijing, China
    35.0
  19. 19HanoiHanoi, Vietnam
    34.4
  20. 20MexicaliBaja California, Mexico
    34.3
  21. 21Karachilow-cost sensorsSindh, Pakistan
    32.9
  22. 22Santa Anita - Los FicusLima region, Peru
    30.2
  23. 23LimaLima Province, Peru
    30.0
  24. 24Prince GeorgeBritish Columbia, Canada
    29.8
  25. 25PristinaPristina, Kosovo
    28.5
  26. 26XonacatlánMéxico, Mexico
    27.8
  27. 27NairobiNairobi County, Kenya
    27.4
  28. 27BamakoBamako, Mali
    27.4
  29. 27TlaquepaqueJalisco, Mexico
    27.4
  30. 30Islamabadlow-cost sensorsIslamabad, Pakistan
    27.1
  31. 31San Francisco TlalcilalcalpanMéxico, Mexico
    26.6
  32. 32JeddahMecca Region, Saudi Arabia
    25.8
  33. 32SarajevoFederation of B&H, Bosnia and Herzegovina
    25.8
  34. 34ZapopanJalisco, Mexico
    25.6
  35. 35Swift CurrentSaskatchewan, Canada
    25.4
  36. 36Red DeerAlberta, Canada
    25.3
  37. 37St. AlbertAlberta, Canada
    25.1
  38. 38San Salvador TizatlalliMéxico, Mexico
    24.8
  39. 39KolkataWest Bengal, India
    24.1
  40. 39TolucaMéxico, Mexico
    24.1
  41. 39Sherwood ParkAlberta, Canada
    24.1
  42. 42AshgabatAshgabat, Turkmenistan
    24.0
  43. 43GuangzhouGuangdong, China
    23.6
  44. 44Villa Poeta José Gálvez BarrenecheaLima region, Peru
    23.2
  45. 44BismarckNorth Dakota, United States
    23.2
  46. 46BakuBaki, Azerbaijan
    23.1
  47. 47HyderabadTelangana, India
    22.8
  48. 47ShenyangLiaoning, China
    22.8
  49. 49AntananarivoAnalamanga, Madagascar
    22.7
  50. 50Richards Baylow-cost sensorsKwaZulu-Natal, South Africa
    22.4
  51. 50Ulu BedokSingapore
    22.4
  52. 52Quezon Citylow-cost sensorsNational Capital Region, Philippines
    22.0
  53. 53SalorTashkent Region, Uzbekistan
    21.9
  54. 54Shakaskraallow-cost sensorsKwaZulu-Natal, South Africa
    20.7
  55. 54N'DjamenaN’Djaména, Chad
    20.7
  56. 56DębicaSubcarpathia, Poland
    20.5
  57. 56Ang Mo Kio New TownSingapore
    20.5
  58. 58ChennaiTamil Nadu, India
    20.4
  59. 59GuadalajaraJalisco, Mexico
    20.3
  60. 60BirminghamAlabama, United States
    20.0
  61. 61MoreliaMichoacán, Mexico
    19.8
  62. 62AnconaThe Marches, Italy
    19.5
  63. 63CalgaryAlberta, Canada
    19.4
  64. 63San Francisco De BorjaLima region, Peru
    19.4
  65. 65CosladaMadrid, Spain
    19.2
  66. 66Ciudad NezahualcoyotlMéxico, Mexico
    19.0
  67. 67Ciudad ApodacaNuevo León, Mexico
    18.8
  68. 68Ciudad JuárezChihuahua, Mexico
    18.6
  69. 69Wan ChaiWan Chai, Hong Kong
    18.5
  70. 69NaplesCampania, Italy
    18.5
  71. 71SaltilloCoahuila, Mexico
    18.3
  72. 72ŁukówLublin, Poland
    18.2
  73. 72KrakówLesser Poland, Poland
    18.2
  74. 74AlgiersAlgiers, Algeria
    18.1
  75. 74Naucalpan de JuárezMéxico, Mexico
    18.1
  76. 76CuernavacaMorelos, Mexico
    17.8
  77. 77Santa CatarinaNuevo León, Mexico
    17.4
  78. 78Jastrzębie ZdrójSilesia, Poland
    16.8
  79. 78Little RockArkansas, United States
    16.8
  80. 80AthensAttica, Greece
    16.6
  81. 80AsprópyrgosAttica, Greece
    16.6
  82. 80SalamancaGuanajuato, Mexico
    16.6
  83. 83TarnówLesser Poland, Poland
    16.5
  84. 83ŻabbarĦaż-Żabbar, Malta
    16.5
  85. 83West FargoNorth Dakota, United States
    16.5
  86. 86Queenstown Estatelow-cost sensorsSingapore
    16.2
  87. 86Falconara MarittimaThe Marches, Italy
    16.2
  88. 86TijuanaBaja California, Mexico
    16.2
  89. 89SliemaTas-Sliema, Malta
    16.1
  90. 89FontanaCalifornia, United States
    16.1
  91. 89IndioCalifornia, United States
    16.1
  92. 92Kathmandulow-cost sensorsBagmati Province, Nepal
    16.0
  93. 92KaliszGreater Poland, Poland
    16.0
  94. 92AlessandriaPiedmont, Italy
    16.0
  95. 95NagaiYamagata, Japan
    15.9
  96. 95CuencaCastille-La Mancha, Spain
    15.9
  97. 97NiskoSubcarpathia, Poland
    15.8
  98. 97LublinLublin, Poland
    15.8
  99. 99Great FallsMontana, United States
    15.6
  100. 100KatowiceSilesia, Poland
    15.5
  101. 101ZamośćLublin, Poland
    15.4
  102. 101Kuala Lumpurlow-cost sensorsKuala Lumpur, Malaysia
    15.4
  103. 101DerbyKansas, United States
    15.4
  104. 101TopekaKansas, United States
    15.4
  105. 105MielecSubcarpathia, Poland
    15.2
  106. 106São PauloSão Paulo, Brazil
    15.1
  107. 107WichitaKansas, United States
    15.0
  108. 107CalexicoCalifornia, United States
    15.0
  109. 109KielceŚwiętokrzyskie, Poland
    14.9
  110. 109CelayaGuanajuato, Mexico
    14.9
  111. 109Canvey IslandEngland, United Kingdom
    14.9
  112. 112ThessaloníkiCentral Macedonia, Greece
    14.8
  113. 112PueblaPuebla, Mexico
    14.8
  114. 112AirdrieAlberta, Canada
    14.8
  115. 115HernandoMississippi, United States
    14.7
  116. 116OstravaMoravian-Silesian Region, Czechia
    14.6
  117. 116JesiThe Marches, Italy
    14.6
  118. 116Mexico CityMexico City, Mexico
    14.6
  119. 116RichmondCalifornia, United States
    14.6
  120. 116Medicine HatAlberta, Canada
    14.6
  121. 121RacibórzSilesia, Poland
    14.5
  122. 121Kansas CityKansas, United States
    14.5
  123. 121Ponca CityOklahoma, United States
    14.5
  124. 124WarsawMazovia, Poland
    14.4
  125. 124OlomoucOlomouc Region, Czechia
    14.4
  126. 124MostÚstí nad Labem Region, Czechia
    14.4
  127. 124DěčínÚstí nad Labem Region, Czechia
    14.4
  128. 124Český TěšínMoravian-Silesian Region, Czechia
    14.4
  129. 124Banja LukaSrpska, Bosnia and Herzegovina
    14.4
  130. 130MiskolcBorsod-Abaúj-Zemplén, Hungary
    14.3
  131. 130Ciudad Benito JuárezNuevo León, Mexico
    14.3
  132. 130RiversideCalifornia, United States
    14.3
  133. 130Rapid CitySouth Dakota, United States
    14.3
  134. 134MinamataKumamoto, Japan
    14.2
  135. 134IyoEhime, Japan
    14.2
  136. 134Grand IslandNebraska, United States
    14.2
  137. 137RadomMazovia, Poland
    14.1
  138. 137BelgradeCentral Serbia, Serbia
    14.1
  139. 137KadaňÚstí nad Labem Region, Czechia
    14.1
  140. 137BerounCentral Bohemia, Czechia
    14.1
  141. 137HueytownAlabama, United States
    14.1
  142. 137ComptonCalifornia, United States
    14.1
  143. 143ToruńKujawsko-Pomorskie, Poland
    14.0
  144. 143OlatheKansas, United States
    14.0
  145. 145AcharnésAttica, Greece
    13.9
  146. 146MumbaiMaharashtra, India
    13.8
  147. 146AstanaAstana, Kazakhstan
    13.8
  148. 146Abujalow-cost sensorsFCT, Nigeria
    13.8
  149. 146TrnavaTrnava Region, Slovakia
    13.8
  150. 150HonmachiKumamoto, Japan
    13.7
  151. 150ŁaskŁódź Voivodeship, Poland
    13.7
  152. 150SalernoCampania, Italy
    13.7
  153. 150ShreveportLouisiana, United States
    13.7
  154. 150JenksOklahoma, United States
    13.7
  155. 155SofiaSofia-Capital, Bulgaria
    13.6
  156. 155NottinghamEngland, United Kingdom
    13.6
  157. 155Jurupa ValleyCalifornia, United States
    13.6
  158. 158RuseRuse, Bulgaria
    13.5
  159. 158StarachowiceŚwiętokrzyskie, Poland
    13.5
  160. 158PoznańGreater Poland, Poland
    13.5
  161. 158KościanGreater Poland, Poland
    13.5
  162. 158BydgoszczKujawsko-Pomorskie, Poland
    13.5
  163. 158OmahaNebraska, United States
    13.5
  164. 164Saint JosephMissouri, United States
    13.4
  165. 164AnaheimCalifornia, United States
    13.4
  166. 166SiedlceMazovia, Poland
    13.3
  167. 166HavířovMoravian-Silesian Region, Czechia
    13.3
  168. 166BillingsMontana, United States
    13.3
  169. 169NišCentral Serbia, Serbia
    13.2
  170. 169GrazStyria, Austria
    13.2
  171. 169WatertownSouth Dakota, United States
    13.2
  172. 169BrandonManitoba, Canada
    13.2
  173. 173PřerovOlomouc Region, Czechia
    13.1
  174. 173East Saint LouisIllinois, United States
    13.1
  175. 175LegionowoMazovia, Poland
    13.0
  176. 175WłocławekKujawsko-Pomorskie, Poland
    13.0
  177. 175KamloopsBritish Columbia, Canada
    13.0
  178. 178TakasakiGunma, Japan
    12.9
  179. 178NiihamaEhime, Japan
    12.9
  180. 178MóstolesMadrid, Spain
    12.9
  181. 178ChihuahuaChihuahua, Mexico
    12.9
  182. 178BartlettTennessee, United States
    12.9
  183. 178Los AngelesCalifornia, United States
    12.9
  184. 178SalinasCalifornia, United States
    12.9
  185. 178Jardines de la SillaNuevo León, Mexico
    12.9
  186. 186KhalándrionAttica, Greece
    12.8
  187. 186MartinŽilina Region, Slovakia
    12.8
  188. 186PardubicePardubice Region, Czechia
    12.8
  189. 186MonterreyNuevo León, Mexico
    12.8
  190. 186TulsaOklahoma, United States
    12.8
  191. 191RzeszówSubcarpathia, Poland
    12.7
  192. 191Almatylow-cost sensorsAlmaty, Kazakhstan
    12.7
  193. 191KasaokaOkayama, Japan
    12.7
  194. 191DunkirkHauts-de-France, France
    12.7
  195. 191BohumínMoravian-Silesian Region, Czechia
    12.7
  196. 191Long BeachCalifornia, United States
    12.7
  197. 191La Crescenta-Montroselow-cost sensorsCalifornia, United States
    12.7
  198. 198GrajewoPodlasie, Poland
    12.6
  199. 198CardiffWales, United Kingdom
    12.6
  200. 198OpoleOpole Voivodeship, Poland
    12.6

Top 200 of 1,830 shown.

Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

By country

Austria 17Belgium 28Bulgaria 7Canada 96China 3Czechia 31Finland 9France 104Germany 46Greece 7Hong Kong 12Hungary 9India 5Ireland 3Italy 26Japan 514Malta 3Martinique 3Mexico 39Pakistan 4Peru 4Poland 49Portugal 7Romania 4Serbia 3Singapore 5Slovakia 22Spain 68Sweden 8Switzerland 5Thailand 3United Kingdom 50United States 593

Ranked cities in each country, September 2023.