SmogRank / History / October 31, 2024

Most polluted cities on October 31, 2024

2,115 cities ranked by their average PM2.5 over the day; the worst was Chennai, India, at 184.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during October 31, 2024. All episodes.

← Chennai 184.0 µg/m³ 150 µg/m³15 WHO 24-hour guideline
Every city ranked for October 31, 2024, 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. 1ChennaiTamil Nadu, India
    25912.3×
  2. 2DelhiDelhi, India
    25111.7×
  3. 3Lahorelow-cost sensorsPunjab, Pakistan
    2219.7×
  4. 4BeijingBeijing, China
    1897.3×
  5. 5BaghdadBaghdad, Iraq
    1826.7×
  6. 6HanoiHanoi, Vietnam
    1786.3×
  7. 7HyderabadTelangana, India
    1786.3×
  8. 8Kampalalow-cost sensorsCentral Region, Uganda
    1776.2×
  9. 9AntananarivoAnalamanga, Madagascar
    1725.7×
  10. 10Kinshasalow-cost sensorsKinshasa, Democratic Republic of the Congo
    1705.5×
  11. 11N'DjamenaN’Djaména, Chad
    1685.3×
  12. 12MumbaiMaharashtra, India
    1675.2×
  13. 13Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1594.5×
  14. 14Dhakalow-cost sensorsDhaka Division, Bangladesh
    1564.1×
  15. 15KolkataWest Bengal, India
    1533.8×
  16. 15Banja LukaSrpska, Bosnia and Herzegovina
    1533.8×
  17. 17SalorTashkent Region, Uzbekistan
    1523.8×
  18. 18Debrecenlow-cost sensorsHajdú-Bihar, Hungary
    1523.8×
  19. 19DushanbeDushanbe, Tajikistan
    1513.7×
  20. 20DejCluj County, Romania
    1503.7×
  21. 21Islamabadlow-cost sensorsIslamabad, Pakistan
    1493.7×
  22. 22CairoCairo, Egypt
    1483.6×
  23. 23SmederevoCentral Serbia, Serbia
    1483.6×
  24. 24KraljevoCentral Serbia, Serbia
    1473.6×
  25. 25Novi PazarCentral Serbia, Serbia
    1393.4×
  26. 26Alcalá de HenaresMadrid, Spain
    1313.2×
  27. 27KragujevacCentral Serbia, Serbia
    1283.1×
  28. 28FuenlabradaMadrid, Spain
    1283.1×
  29. 29ObrenovacCentral Serbia, Serbia
    1273.1×
  30. 30NišCentral Serbia, Serbia
    1253.0×
  31. 31ĆuprijaCentral Serbia, Serbia
    1243.0×
  32. 32LazarevacCentral Serbia, Serbia
    1233.0×
  33. 33ZemunCentral Serbia, Serbia
    1222.9×
  34. 34Torrejón de ArdozMadrid, Spain
    1222.9×
  35. 35MadridMadrid, Spain
    1212.9×
  36. 36CosladaMadrid, Spain
    1212.9×
  37. 37Kathmandulow-cost sensorsBagmati Province, Nepal
    1182.8×
  38. 38MóstolesMadrid, Spain
    1162.8×
  39. 39NyíregyházaSzabolcs-Szatmár-Bereg, Hungary
    1152.8×
  40. 39BelgradeCentral Serbia, Serbia
    1152.8×
  41. 41Barrio de PeralMurcia, Spain
    1142.7×
  42. 42TravnikFederation of B&H, Bosnia and Herzegovina
    1102.6×
  43. 43SarajevoFederation of B&H, Bosnia and Herzegovina
    1092.6×
  44. 44SremčicaCentral Serbia, Serbia
    1092.6×
  45. 45UžiceCentral Serbia, Serbia
    1082.6×
  46. 46MurciaMurcia, Spain
    1082.5×
  47. 46ValjevoCentral Serbia, Serbia
    1082.5×
  48. 48JakartaJakarta, Indonesia
    1052.5×
  49. 49LorcaMurcia, Spain
    1042.5×
  50. 50Molina de SeguraMurcia, Spain
    1042.4×
  51. 51MiskolcBorsod-Abaúj-Zemplén, Hungary
    1022.4×
  52. 52AshgabatAshgabat, Turkmenistan
    1002.4×
  53. 52ČačakCentral Serbia, Serbia
    1002.4×
  54. 54AlgeteMadrid, Spain
    1002.4×
  55. 55Collado-VillalbaMadrid, Spain
    1002.3×
  56. 56Yerevanlow-cost sensorsYerevan, Armenia
    992.3×
  57. 57PančevoVojvodina, Serbia
    992.3×
  58. 58CartagenaMurcia, Spain
    992.3×
  59. 59Bang NaBangkok, Thailand
    982.3×
  60. 60IksanJeollabuk-do, South Korea
    972.3×
  61. 60PubalGyeonggi-do, South Korea
    972.3×
  62. 60CuencaCastille-La Mancha, Spain
    972.3×
  63. 63VigoGalicia, Spain
    952.2×
  64. 63IrapuatoGuanajuato, Mexico
    952.2×
  65. 65KigaliKigali, Rwanda
    932.1×
  66. 65Jurong WestSingapore
    932.1×
  67. 67PúchovTrenčín Region, Slovakia
    922.1×
  68. 68YesanChungcheongnam-do, South Korea
    922.1×
  69. 69BakuBaki, Azerbaijan
    922.1×
  70. 70KimjeJeollabuk-do, South Korea
    912.1×
  71. 71CodleaBrașov County, Romania
    912.0×
  72. 72BuanJeollabuk-do, South Korea
    912.0×
  73. 73GunsanJeollabuk-do, South Korea
    902.0×
  74. 74Hwaseong-siGyeonggi-do, South Korea
    902.0×
  75. 75ValenciaValencia, Spain
    902.0×
  76. 75ValdemoroMadrid, Spain
    902.0×
  77. 75Medina del CampoCastille and León, Spain
    902.0×
  78. 78KazincbarcikaBorsod-Abaúj-Zemplén, Hungary
    902.0×
  79. 79BucharestBucharest, Romania
    892.0×
  80. 80CoronelBiobio, Chile
    892.0×
  81. 81Khlong Sam WaBangkok, Thailand
    892.0×
  82. 82Chinch'ŏnNorth Chungcheong, South Korea
    881.9×
  83. 83Ang Mo Kio New TownSingapore
    881.9×
  84. 84Gimpo-siGyeonggi-do, South Korea
    881.9×
  85. 84Saphan SungBangkok, Thailand
    881.9×
  86. 86RuseRuse, Bulgaria
    871.9×
  87. 86Wan ChaiWan Chai, Hong Kong
    871.9×
  88. 86Khan Na YaoBangkok, Thailand
    871.9×
  89. 89AsanChungcheongnam-do, South Korea
    871.9×
  90. 89HualpénBiobio, Chile
    871.9×
  91. 89Santa Anita - Los FicusLima region, Peru
    871.9×
  92. 92San CarlosÑuble, Chile
    871.9×
  93. 93TangjinChungcheongnam-do, South Korea
    861.9×
  94. 94PirotCentral Serbia, Serbia
    861.9×
  95. 95IncheonIncheon, South Korea
    861.9×
  96. 95Novi SadVojvodina, Serbia
    861.9×
  97. 97Ban Samae DamBangkok, Thailand
    861.8×
  98. 98ValladolidCastille and León, Spain
    851.8×
  99. 99Tuen MunTuen Mun, Hong Kong
    851.8×
  100. 100Nong KhaemBangkok, Thailand
    851.8×
  101. 100Silao de la VictoriaGuanajuato, Mexico
    851.8×
  102. 102BihaćFederation of B&H, Bosnia and Herzegovina
    851.8×
  103. 103NonsanChungcheongnam-do, South Korea
    841.8×
  104. 103FutogVojvodina, Serbia
    841.8×
  105. 105BorCentral Serbia, Serbia
    841.8×
  106. 105Lat KrabangBangkok, Thailand
    841.8×
  107. 105Bueng KumBangkok, Thailand
    841.8×
  108. 108FanlingNorth District, Hong Kong
    841.8×
  109. 108Jacobo HunterArequipa, Peru
    841.8×
  110. 110SeonghwanChungcheongnam-do, South Korea
    841.8×
  111. 111Goyang-siGyeonggi-do, South Korea
    841.8×
  112. 111LimaLima Province, Peru
    841.8×
  113. 113Botevgradlow-cost sensorsSofia, Bulgaria
    831.7×
  114. 114Puente AltoSantiago Metropolitan, Chile
    831.7×
  115. 115BoryeongChungcheongnam-do, South Korea
    821.7×
  116. 115PyeongtaekGyeonggi-do, South Korea
    821.7×
  117. 117TrebišovKošice Region, Slovakia
    821.7×
  118. 117GuangzhouGuangdong, China
    821.7×
  119. 117MasanGwangju, South Korea
    821.7×
  120. 120WoodlandsSingapore
    821.7×
  121. 120CelayaGuanajuato, Mexico
    821.7×
  122. 122Ulan BatorUlaanbaatar, Mongolia
    821.7×
  123. 122LeónCastille and León, Spain
    821.7×
  124. 124HongseongChungcheongnam-do, South Korea
    821.7×
  125. 125San Tung Chung HangIslands, Hong Kong
    811.7×
  126. 126GumiGyeongsangbuk-do, South Korea
    811.7×
  127. 127Ban Khlong PrawetBangkok, Thailand
    801.7×
  128. 127ToméBiobio, Chile
    801.7×
  129. 127Sai MaiBangkok, Thailand
    801.7×
  130. 130Cheongju-siNorth Chungcheong, South Korea
    801.6×
  131. 130SantiagoSantiago Metropolitan, Chile
    801.6×
  132. 132WormsRheinland-Pfalz, Germany
    801.6×
  133. 132Mexico CityMexico City, Mexico
    801.6×
  134. 134YŏnmuChungcheongnam-do, South Korea
    801.6×
  135. 135YeonggwangJeollanam-do, South Korea
    791.6×
  136. 135Bucheon-siGyeonggi-do, South Korea
    791.6×
  137. 135NacimientoBiobio, Chile
    791.6×
  138. 138Ganghwa-gunIncheon, South Korea
    791.6×
  139. 138ToledoCastille-La Mancha, Spain
    791.6×
  140. 140Ansan-siGyeonggi-do, South Korea
    791.6×
  141. 140ArlesProvence-Alpes-Côte d'Azur, France
    791.6×
  142. 142VillenaValencia, Spain
    791.6×
  143. 142TocopillaAntofagasta, Chile
    791.6×
  144. 142Lak SiBangkok, Thailand
    791.6×
  145. 145Tin Shui WaiYuen Long, Hong Kong
    781.6×
  146. 145OurenseGalicia, Spain
    781.6×
  147. 147ConakryConakry, Guinea
    781.6×
  148. 148CulleredoGalicia, Spain
    781.6×
  149. 149CalaisHauts-de-France, France
    781.6×
  150. 150BangkokBangkok, Thailand
    771.6×
  151. 150Bang KapiBangkok, Thailand
    771.6×
  152. 150GimcheonGyeongsangbuk-do, South Korea
    771.6×
  153. 153Almatylow-cost sensorsAlmaty, Kazakhstan
    771.5×
  154. 153Tai PoTai Po, Hong Kong
    771.5×
  155. 153Icheon-siGyeonggi-do, South Korea
    771.5×
  156. 156San Pedro de la PazBiobio, Chile
    771.5×
  157. 157RancaguaO'Higgins Region, Chile
    771.5×
  158. 158SamaAsturias, Spain
    761.5×
  159. 158HualquiBiobio, Chile
    761.5×
  160. 160Koch'angJeollabuk-do, South Korea
    761.5×
  161. 161GwangmyeongGyeonggi-do, South Korea
    761.5×
  162. 162IaşiIași County, Romania
    761.5×
  163. 162VarnaVarna, Bulgaria
    761.5×
  164. 162VillarricaAraucania, Chile
    761.5×
  165. 165Nong ChokBangkok, Thailand
    751.5×
  166. 165NamsaJeollabuk-do, South Korea
    751.5×
  167. 167KoesanNorth Chungcheong, South Korea
    751.5×
  168. 167A CoruñaGalicia, Spain
    751.5×
  169. 167JeongeupJeollabuk-do, South Korea
    751.5×
  170. 170Medina Estateslow-cost sensorsGreater Accra, Ghana
    751.5×
  171. 171CheonanChungcheongnam-do, South Korea
    751.5×
  172. 172JungpyongNorth Chungcheong, South Korea
    741.4×
  173. 173Villa Poeta José Gálvez BarrenecheaLima region, Peru
    741.4×
  174. 174Vranov nad TopľouPrešov Region, Slovakia
    741.4×
  175. 174MagongTaiwan, Taiwan
    741.4×
  176. 174OsanGyeonggi-do, South Korea
    741.4×
  177. 174MokpoJeollanam-do, South Korea
    741.4×
  178. 174MaarssenUtrecht, The Netherlands
    741.4×
  179. 174CuranilahueBiobio, Chile
    741.4×
  180. 180Anyang-siGyeonggi-do, South Korea
    741.4×
  181. 180ValenceAuvergne-Rhône-Alpes, France
    741.4×
  182. 182YeonilGyeongsangbuk-do, South Korea
    741.4×
  183. 182YeojuGyeonggi-do, South Korea
    741.4×
  184. 182MunsanGyeonggi-do, South Korea
    741.4×
  185. 182LinaresMaule Region, Chile
    741.4×
  186. 182León de los AldamaGuanajuato, Mexico
    741.4×
  187. 182ChangnyeongGyeongsangnam-do, South Korea
    741.4×
  188. 188SangjuGyeongsangbuk-do, South Korea
    731.4×
  189. 188ChiguayanteBiobio, Chile
    731.4×
  190. 188HarewoodBritish Columbia, Canada
    731.4×
  191. 191SeoulSeoul, South Korea
    731.4×
  192. 192Tsuen WanTsuen Wan, Hong Kong
    731.4×
  193. 192SuwonGyeonggi-do, South Korea
    731.4×
  194. 194Mong KokYau Tsim Mong District, Hong Kong
    721.4×
  195. 194WanjuJeollabuk-do, South Korea
    721.4×
  196. 194PalenciaCastille and León, Spain
    721.4×
  197. 194NarónGalicia, Spain
    721.4×
  198. 194FerrolGalicia, Spain
    721.4×
  199. 194TalcahuanoBiobio, Chile
    721.4×
  200. 194CoyhaiqueAysén, Chile
    721.4×

Top 200 of 2,115 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

Not covered: the government monitoring networks of China and Turkey, which publish no terms that let us reuse their readings. Most cities there are missing from this board, not clean. Why.

Use this board

SmogRank, most polluted cities, PM2.5, October 31, 2024, smogrank.com/history/2024-10-31 (accessed 3 Oct 2026).

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