SmogRank / History / October 4, 2023

Most polluted cities on October 4, 2023

1,871 cities ranked by their average PM2.5 over the day; the worst was N'Djamena, Chad, at 144.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during October 4, 2023. All episodes.

← N'Djamena 144.0 µg/m³ 100 µg/m³15 WHO 24-hour guideline
Every city ranked for October 4, 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. 1N'DjamenaN’Djaména, Chad
    2199.6×
  2. 2Lahorelow-cost sensorsPunjab, Pakistan
    1826.7×
  3. 3Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1786.3×
  4. 4Abujalow-cost sensorsFCT, Nigeria
    1735.8×
  5. 5CairoCairo, Egypt
    1574.2×
  6. 6Victoria de DurangoDurango, Mexico
    1564.2×
  7. 7DelhiDelhi, India
    1533.9×
  8. 8HyderabadTelangana, India
    1503.7×
  9. 9JakartaJakarta, Indonesia
    1493.7×
  10. 10HanoiHanoi, Vietnam
    1393.4×
  11. 11Santa Anita - Los FicusLima region, Peru
    1313.2×
  12. 12NacimientoBiobio, Chile
    1303.2×
  13. 13ZapopanJalisco, Mexico
    1222.9×
  14. 14Wan ChaiWan Chai, Hong Kong
    1222.9×
  15. 15Puerto VarasLos Lagos Region, Chile
    1172.8×
  16. 16Islamabadlow-cost sensorsIslamabad, Pakistan
    1142.7×
  17. 17Kampalalow-cost sensorsCentral Region, Uganda
    1102.6×
  18. 17HernandoMississippi, United States
    1102.6×
  19. 19PristinaPristina, Kosovo
    1102.6×
  20. 20Puerto MonttLos Lagos Region, Chile
    1082.6×
  21. 21OsornoLos Lagos Region, Chile
    1072.5×
  22. 22AstanaAstana, Kazakhstan
    1062.5×
  23. 23TemucoAraucania, Chile
    1052.5×
  24. 23La UniónLos Ríos Region, Chile
    1052.5×
  25. 25DushanbeDushanbe, Tajikistan
    1042.4×
  26. 26San Juan del RíoQuerétaro, Mexico
    1032.4×
  27. 27LimaLima Province, Peru
    1022.4×
  28. 28GuangzhouGuangdong, China
    1022.4×
  29. 29Ferry PassFlorida, United States
    952.2×
  30. 30BartlettTennessee, United States
    952.2×
  31. 30MidwayFlorida, United States
    952.2×
  32. 32Şabāḩ as SālimMubārak al Kabīr, Kuwait
    942.2×
  33. 33BamakoBamako, Mali
    942.2×
  34. 34PascagoulaMississippi, United States
    942.1×
  35. 35HattiesburgMississippi, United States
    932.1×
  36. 36Baton RougeLouisiana, United States
    932.1×
  37. 37GulfportMississippi, United States
    922.1×
  38. 38Tuen MunTuen Mun, Hong Kong
    912.1×
  39. 38HualquiBiobio, Chile
    912.1×
  40. 40MexicaliBaja California, Mexico
    902.0×
  41. 41Villa Poeta José Gálvez BarrenecheaLima region, Peru
    902.0×
  42. 42San Tung Chung HangIslands, Hong Kong
    892.0×
  43. 42Ang Mo Kio New TownSingapore
    892.0×
  44. 44New OrleansLouisiana, United States
    892.0×
  45. 45Tin Shui WaiYuen Long, Hong Kong
    881.9×
  46. 45Ulu BedokSingapore
    881.9×
  47. 47Mong KokYau Tsim Mong District, Hong Kong
    881.9×
  48. 47CallaoCallao, Peru
    881.9×
  49. 49Karachilow-cost sensorsSindh, Pakistan
    881.9×
  50. 50SarajevoFederation of B&H, Bosnia and Herzegovina
    871.9×
  51. 51Daytona BeachFlorida, United States
    871.9×
  52. 52ChillánÑuble, Chile
    871.9×
  53. 53FairhopeAlabama, United States
    871.9×
  54. 54Tsuen WanTsuen Wan, Hong Kong
    861.9×
  55. 54Kwai ChungKwai Tsing District, Hong Kong
    861.9×
  56. 56Sau Mau PingKwun Tong District, Hong Kong
    851.8×
  57. 56BirminghamAlabama, United States
    851.8×
  58. 58Little RockArkansas, United States
    851.8×
  59. 59VictoriaCentral and Western, Hong Kong
    851.8×
  60. 60JacksonMississippi, United States
    841.8×
  61. 61CoyhaiqueAysén, Chile
    841.8×
  62. 62East Saint LouisIllinois, United States
    841.8×
  63. 63Sham Shui PoSham Shui Po District, Hong Kong
    831.8×
  64. 63West MemphisArkansas, United States
    831.8×
  65. 63OcalaFlorida, United States
    831.8×
  66. 63LafayetteLouisiana, United States
    831.8×
  67. 67FanlingNorth District, Hong Kong
    831.8×
  68. 68CoronelBiobio, Chile
    831.7×
  69. 69SulphurLouisiana, United States
    821.7×
  70. 70TocopillaAntofagasta, Chile
    821.7×
  71. 70San Francisco De BorjaLima region, Peru
    821.7×
  72. 72Queenstown Estatelow-cost sensorsSingapore
    821.7×
  73. 72San CarlosÑuble, Chile
    821.7×
  74. 74TalcahuanoBiobio, Chile
    811.7×
  75. 75Tai PoTai Po, Hong Kong
    801.6×
  76. 76CuranilahueBiobio, Chile
    791.6×
  77. 77AlbanyGeorgia, United States
    791.6×
  78. 78Upper AltonIllinois, United States
    791.6×
  79. 79Tha BoNong Khai, Thailand
    791.6×
  80. 80Sha TinSha Tin, Hong Kong
    781.6×
  81. 81Dhakalow-cost sensorsDhaka Division, Bangladesh
    781.6×
  82. 81ValdiviaLos Ríos Region, Chile
    781.6×
  83. 83SantiagoSantiago Metropolitan, Chile
    781.6×
  84. 83St. LouisMissouri, United States
    781.6×
  85. 85PrichardAlabama, United States
    781.6×
  86. 86TrentoTrentino-Alto Adige, Italy
    771.5×
  87. 87TetovoTetovo, North Macedonia
    771.5×
  88. 88CholulaPuebla, Mexico
    761.5×
  89. 89ConcepciónBiobio, Chile
    761.5×
  90. 89Port ArthurTexas, United States
    761.5×
  91. 91MumbaiMaharashtra, India
    751.5×
  92. 92NaplesCampania, Italy
    751.5×
  93. 92Asunciónlow-cost sensorsAsuncion, Paraguay
    751.5×
  94. 94LemayMissouri, United States
    751.5×
  95. 94University CityMissouri, United States
    751.5×
  96. 96HueytownAlabama, United States
    751.5×
  97. 96TallahasseeFlorida, United States
    751.5×
  98. 98ToméBiobio, Chile
    741.4×
  99. 98CuricóMaule Region, Chile
    741.4×
  100. 98DecaturIllinois, United States
    741.4×
  101. 98BaytownTexas, United States
    741.4×
  102. 102RuseRuse, Bulgaria
    741.4×
  103. 102SpringfieldIllinois, United States
    741.4×
  104. 104AricaArica y Parinacota Region, Chile
    741.4×
  105. 105RancaguaO'Higgins Region, Chile
    741.4×
  106. 106ShreveportLouisiana, United States
    741.4×
  107. 107Granite CityIllinois, United States
    741.4×
  108. 108BloomingtonIllinois, United States
    731.4×
  109. 109BensalemPennsylvania, United States
    731.4×
  110. 110AlessandriaPiedmont, Italy
    731.4×
  111. 110TalaganteSantiago Metropolitan, Chile
    731.4×
  112. 112Shakaskraallow-cost sensorsKwaZulu-Natal, South Africa
    731.4×
  113. 113Los ÁngelesBiobio, Chile
    721.4×
  114. 113CauquenesMaule Region, Chile
    721.4×
  115. 113DyersburgTennessee, United States
    721.4×
  116. 113ElizabethNew Jersey, United States
    721.4×
  117. 117TijuanaBaja California, Mexico
    721.4×
  118. 117San Pedro de la PazBiobio, Chile
    721.4×
  119. 119HuelvaAndalusia, Spain
    721.4×
  120. 119AntofagastaAntofagasta, Chile
    721.4×
  121. 121QuillotaValparaiso, Chile
    721.3×
  122. 122PaducahKentucky, United States
    711.3×
  123. 123LuganoTicino, Switzerland
    711.3×
  124. 123Puente AltoSantiago Metropolitan, Chile
    711.3×
  125. 123LotaBiobio, Chile
    711.3×
  126. 123CopiapóAtacama, Chile
    711.3×
  127. 123GalvestonTexas, United States
    711.3×
  128. 128AlgiersAlgiers, Algeria
    711.3×
  129. 128ŻabbarĦaż-Żabbar, Malta
    711.3×
  130. 128XonacatlánMéxico, Mexico
    711.3×
  131. 128East LakeFlorida, United States
    711.3×
  132. 128Trois-RivièresQuebec, Canada
    711.3×
  133. 133RoveretoTrentino-Alto Adige, Italy
    711.3×
  134. 133NapervilleIllinois, United States
    711.3×
  135. 135Falconara MarittimaThe Marches, Italy
    701.3×
  136. 136Lake MaryFlorida, United States
    701.3×
  137. 137SevillaAndalusia, Spain
    701.3×
  138. 137San Francisco TlalcilalcalpanMéxico, Mexico
    701.3×
  139. 137QuinteroValparaiso, Chile
    701.3×
  140. 137CoquimboCoquimbo Region, Chile
    701.3×
  141. 137TlaquepaqueJalisco, Mexico
    701.3×
  142. 142SliemaTas-Sliema, Malta
    701.3×
  143. 143Las Palmas de Gran CanariaCanary Islands, Spain
    701.3×
  144. 143JacksonTennessee, United States
    701.3×
  145. 143Des PlainesIllinois, United States
    701.3×
  146. 143NorthbrookIllinois, United States
    701.3×
  147. 147Puerto AysénAysén, Chile
    691.3×
  148. 147GainesvilleFlorida, United States
    691.3×
  149. 147ArnoldMissouri, United States
    691.3×
  150. 150MontemurloTuscany, Italy
    691.2×
  151. 151San RoqueAndalusia, Spain
    691.2×
  152. 151BolzanoTrentino-Alto Adige, Italy
    691.2×
  153. 153TolucaMéxico, Mexico
    691.2×
  154. 154Franklin ParkIllinois, United States
    681.2×
  155. 154RockfordIllinois, United States
    681.2×
  156. 156KasaokaOkayama, Japan
    681.2×
  157. 156ConcónValparaiso, Chile
    681.2×
  158. 156JolietIllinois, United States
    681.2×
  159. 156East ChicagoIndiana, United States
    681.2×
  160. 160CharlotteNorth Carolina, United States
    681.2×
  161. 161RengoO'Higgins Region, Chile
    681.2×
  162. 162SaltilloCoahuila, Mexico
    671.2×
  163. 163SzegedCsongrád, Hungary
    671.2×
  164. 163SkopjeGrad Skopje, North Macedonia
    671.2×
  165. 163WoodlandsSingapore
    671.2×
  166. 163CalamaAntofagasta, Chile
    671.2×
  167. 167BelgradeCentral Serbia, Serbia
    671.2×
  168. 168ChiguayanteBiobio, Chile
    671.2×
  169. 168Ponte Vedra BeachFlorida, United States
    671.2×
  170. 168CorcoranCalifornia, United States
    671.2×
  171. 171NagaiYamagata, Japan
    671.2×
  172. 171ValdemoroMadrid, Spain
    671.2×
  173. 171La SerenaCoquimbo Region, Chile
    671.2×
  174. 171Calumet CityIllinois, United States
    671.2×
  175. 175Tula de AllendeHidalgo, Mexico
    661.2×
  176. 175Fruit CoveFlorida, United States
    661.2×
  177. 175HoustonTexas, United States
    661.2×
  178. 175Lexingtonlow-cost sensorsMassachusetts, United States
    661.2×
  179. 179San Salvador TizatlalliMéxico, Mexico
    661.2×
  180. 180Addis AbabaAddis Ababa, Ethiopia
    661.1×
  181. 180Santa Cruz de TenerifeCanary Islands, Spain
    661.1×
  182. 180Civitanova MarcheThe Marches, Italy
    661.1×
  183. 180Viña del MarValparaiso, Chile
    661.1×
  184. 180Winter ParkFlorida, United States
    661.1×
  185. 185PasadenaTexas, United States
    661.1×
  186. 186KolkataWest Bengal, India
    661.1×
  187. 186TalcaMaule Region, Chile
    661.1×
  188. 188KavadarciKavadarci, North Macedonia
    651.1×
  189. 188SalorTashkent Region, Uzbekistan
    651.1×
  190. 190Samut SakhonSamut Sakhon, Thailand
    651.1×
  191. 190BangkokBangkok, Thailand
    651.1×
  192. 190La OrotavaCanary Islands, Spain
    651.1×
  193. 190MóstolesMadrid, Spain
    651.1×
  194. 194TorontoOntario, Canada
    651.1×
  195. 195LakelandFlorida, United States
    651.1×
  196. 196BailénAndalusia, Spain
    651.1×
  197. 196La PorteTexas, United States
    651.1×
  198. 198TrentonNew Jersey, United States
    641.1×
  199. 199AsprópyrgosAttica, Greece
    641.1×
  200. 199MurciaMurcia, Spain
    641.1×

Top 200 of 1,871 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, October 4, 2023, smogrank.com/history/2023-10-04 (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.