SmogRank / History / December 31, 2023

Most polluted cities on December 31, 2023

1,931 cities ranked by their average PM2.5 over the day; the worst was Delhi, India, at 262.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during December 31, 2023. All episodes.

← Delhi 262.0 µg/m³ 200 µg/m³15 WHO 24-hour guideline
Every city ranked for December 31, 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. 1DelhiDelhi, India
    37417.5×
  2. 2Lahorelow-cost sensorsPunjab, Pakistan
    34816.6×
  3. 3Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    31215.4×
  4. 4Dhakalow-cost sensorsDhaka Division, Bangladesh
    26112.4×
  5. 5Islamabadlow-cost sensorsIslamabad, Pakistan
    23410.6×
  6. 6KolkataWest Bengal, India
    22810.2×
  7. 7VelesVeles, North Macedonia
    2018.4×
  8. 7TetovoTetovo, North Macedonia
    2018.4×
  9. 9Abujalow-cost sensorsFCT, Nigeria
    1988.1×
  10. 9Ciudad Benito JuárezNuevo León, Mexico
    1988.1×
  11. 11SarajevoFederation of B&H, Bosnia and Herzegovina
    1968.0×
  12. 12SkopjeGrad Skopje, North Macedonia
    1867.0×
  13. 13PristinaPristina, Kosovo
    1856.9×
  14. 14MumbaiMaharashtra, India
    1806.4×
  15. 15KavadarciKavadarci, North Macedonia
    1786.2×
  16. 16NišCentral Serbia, Serbia
    1776.2×
  17. 17Karachilow-cost sensorsSindh, Pakistan
    1766.1×
  18. 18DushanbeDushanbe, Tajikistan
    1756.0×
  19. 19Lagoslow-cost sensorsLagos, Nigeria
    1756.0×
  20. 20SalorTashkent Region, Uzbekistan
    1735.8×
  21. 21GuangzhouGuangdong, China
    1725.7×
  22. 22HyderabadTelangana, India
    1715.6×
  23. 23ChennaiTamil Nadu, India
    1675.3×
  24. 24IlindenIlinden, North Macedonia
    1675.2×
  25. 25BitolaBitola, North Macedonia
    1665.1×
  26. 26BeneventoCampania, Italy
    1655.0×
  27. 27Tuen MunTuen Mun, Hong Kong
    1594.4×
  28. 28HomesteadFlorida, United States
    1574.3×
  29. 29San AntonioTexas, United States
    1544.0×
  30. 30Ciudad ApodacaNuevo León, Mexico
    1544.0×
  31. 31Kathmandulow-cost sensorsBagmati Province, Nepal
    1544.0×
  32. 32Cluj-NapocaCluj County, Romania
    1533.9×
  33. 33VolosThessaly, Greece
    1523.8×
  34. 34DejCluj County, Romania
    1523.8×
  35. 35Tin Shui WaiYuen Long, Hong Kong
    1523.8×
  36. 36Kampalalow-cost sensorsCentral Region, Uganda
    1523.8×
  37. 37Tsuen WanTsuen Wan, Hong Kong
    1523.8×
  38. 38CapannoriTuscany, Italy
    1503.7×
  39. 39Haskovolow-cost sensorsHaskovo, Bulgaria
    1493.7×
  40. 40Wan ChaiWan Chai, Hong Kong
    1483.6×
  41. 41JakartaJakarta, Indonesia
    1453.6×
  42. 42LleidaCatalonia, Spain
    1453.6×
  43. 43BelgradeCentral Serbia, Serbia
    1443.5×
  44. 44Ciudad General EscobedoNuevo León, Mexico
    1433.5×
  45. 45NogalesSonora, Mexico
    1383.4×
  46. 46IaşiIași County, Romania
    1363.3×
  47. 47BohumínMoravian-Silesian Region, Czechia
    1343.3×
  48. 48Almatylow-cost sensorsAlmaty, Kazakhstan
    1333.2×
  49. 49KochaniKochani, North Macedonia
    1323.2×
  50. 50AthensAttica, Greece
    1323.2×
  51. 50San Tung Chung HangIslands, Hong Kong
    1323.2×
  52. 52Samut SakhonSamut Sakhon, Thailand
    1313.2×
  53. 53Botevgradlow-cost sensorsSofia, Bulgaria
    1303.2×
  54. 54ThessaloníkiCentral Macedonia, Greece
    1303.1×
  55. 54ShenyangLiaoning, China
    1303.1×
  56. 56Kwai ChungKwai Tsing District, Hong Kong
    1293.1×
  57. 57ValdostaGeorgia, United States
    1283.1×
  58. 58ZapopanJalisco, Mexico
    1273.1×
  59. 59Mong KokYau Tsim Mong District, Hong Kong
    1263.1×
  60. 60Cadereyta JiménezNuevo León, Mexico
    1263.0×
  61. 61MurciaMurcia, Spain
    1263.0×
  62. 62Nakhon PathomNakhon Pathom, Thailand
    1243.0×
  63. 63CholulaPuebla, Mexico
    1243.0×
  64. 64San Francisco TlalcilalcalpanMéxico, Mexico
    1243.0×
  65. 65VictoriaCentral and Western, Hong Kong
    1222.9×
  66. 66BucharestBucharest, Romania
    1212.9×
  67. 67NogalesArizona, United States
    1202.9×
  68. 68Mueang NonthaburiNonthaburi, Thailand
    1202.9×
  69. 69Ulan BatorUlaanbaatar, Mongolia
    1192.8×
  70. 70Sham Shui PoSham Shui Po District, Hong Kong
    1172.8×
  71. 71Spišská Nová VesKošice Region, Slovakia
    1162.8×
  72. 71Grande PrairieAlberta, Canada
    1162.8×
  73. 73MiskolcBorsod-Abaúj-Zemplén, Hungary
    1132.7×
  74. 74PátraWest Greece, Greece
    1112.6×
  75. 75GuadalajaraJalisco, Mexico
    1112.6×
  76. 76KazincbarcikaBorsod-Abaúj-Zemplén, Hungary
    1092.6×
  77. 77BailénAndalusia, Spain
    1092.6×
  78. 77AlessandriaPiedmont, Italy
    1092.6×
  79. 79YangonYangon, Myanmar
    1082.6×
  80. 79ManlleuCatalonia, Spain
    1082.6×
  81. 79PesaroThe Marches, Italy
    1082.6×
  82. 82Deerfield BeachFlorida, United States
    1072.5×
  83. 83BangkokBangkok, Thailand
    1072.5×
  84. 84Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1062.5×
  85. 85WolfsbergCarinthia, Austria
    1032.4×
  86. 86BadgerAlaska, United States
    1012.4×
  87. 87NaplesCampania, Italy
    1002.3×
  88. 88KigaliKigali, Rwanda
    982.3×
  89. 89Nong KhaemBangkok, Thailand
    982.3×
  90. 89Mollet del VallèsCatalonia, Spain
    982.3×
  91. 91Khlong LuangPathum Thani, Thailand
    972.3×
  92. 91TorreviejaValencia, Spain
    972.3×
  93. 93Phra PradaengSamut Prakan, Thailand
    972.2×
  94. 94ZvolenBanská Bystrica Region, Slovakia
    962.2×
  95. 95NyíregyházaSzabolcs-Szatmár-Bereg, Hungary
    962.2×
  96. 96ConroeTexas, United States
    962.2×
  97. 96MillcreekUtah, United States
    962.2×
  98. 98Novi SadVojvodina, Serbia
    942.1×
  99. 99MexicaliBaja California, Mexico
    932.1×
  100. 100SevillaAndalusia, Spain
    932.1×
  101. 101Bang Bo DistrictSamut Prakan, Thailand
    932.1×
  102. 102IrapuatoGuanajuato, Mexico
    922.1×
  103. 103AcharnésAttica, Greece
    912.0×
  104. 103SalamancaGuanajuato, Mexico
    912.0×
  105. 105TolucaMéxico, Mexico
    912.0×
  106. 105GlendaleArizona, United States
    912.0×
  107. 107Samut PrakanSamut Prakan, Thailand
    912.0×
  108. 107CelayaGuanajuato, Mexico
    912.0×
  109. 109Gabrovolow-cost sensorsGabrovo, Bulgaria
    902.0×
  110. 109HuelvaAndalusia, Spain
    902.0×
  111. 109West JordanUtah, United States
    902.0×
  112. 112TurinPiedmont, Italy
    902.0×
  113. 113RuseRuse, Bulgaria
    902.0×
  114. 114LuganoTicino, Switzerland
    902.0×
  115. 115CórdobaAndalusia, Spain
    902.0×
  116. 115Banská BystricaBanská Bystrica Region, Slovakia
    902.0×
  117. 117Sau Mau PingKwun Tong District, Hong Kong
    881.9×
  118. 118CartagenaMurcia, Spain
    881.9×
  119. 118Santiago de QuerétaroQuerétaro, Mexico
    881.9×
  120. 118ButteMontana, United States
    881.9×
  121. 121TucsonArizona, United States
    871.9×
  122. 122YachimataChiba, Japan
    871.9×
  123. 122Silao de la VictoriaGuanajuato, Mexico
    871.9×
  124. 122PascagoulaMississippi, United States
    871.9×
  125. 125AbasoloGuanajuato, Mexico
    861.9×
  126. 126Mixquiahuala de JuárezHidalgo, Mexico
    861.9×
  127. 127Salt Lake CityUtah, United States
    861.9×
  128. 128AlgiersAlgiers, Algeria
    851.8×
  129. 128ShikokuchūōEhime, Japan
    851.8×
  130. 130Klagenfurt am WörtherseeCarinthia, Austria
    851.8×
  131. 130GrazStyria, Austria
    851.8×
  132. 130HavířovMoravian-Silesian Region, Czechia
    851.8×
  133. 133YotsukaidōChiba, Japan
    851.8×
  134. 133TōganeChiba, Japan
    851.8×
  135. 133El PasoTexas, United States
    851.8×
  136. 136Santa CatarinaNuevo León, Mexico
    851.8×
  137. 137KošiceKošice Region, Slovakia
    841.8×
  138. 138SzegedCsongrád, Hungary
    841.8×
  139. 139DěčínÚstí nad Labem Region, Czechia
    841.8×
  140. 140Kan’onjichōKagawa, Japan
    841.8×
  141. 141MonterreyNuevo León, Mexico
    831.8×
  142. 141Victoria de DurangoDurango, Mexico
    831.8×
  143. 143Tai PoTai Po, Hong Kong
    831.8×
  144. 144Banja LukaSrpska, Bosnia and Herzegovina
    831.7×
  145. 145ComptonCalifornia, United States
    821.7×
  146. 146CraiovaDolj, Romania
    821.7×
  147. 147OlomoucOlomouc Region, Czechia
    821.7×
  148. 148MiyakonojōMiyazaki, Japan
    821.7×
  149. 149HumennéPrešov Region, Slovakia
    811.7×
  150. 149Maebaru-chūōFukuoka, Japan
    811.7×
  151. 151AlbanyGeorgia, United States
    811.7×
  152. 151PhoenixArizona, United States
    811.7×
  153. 153ValricoFlorida, United States
    811.7×
  154. 154TijuanaBaja California, Mexico
    811.7×
  155. 154GotōNagasaki, Japan
    811.7×
  156. 156PiraeusAttica, Greece
    801.6×
  157. 156AsprópyrgosAttica, Greece
    801.6×
  158. 156YanagawaFukuoka, Japan
    801.6×
  159. 156FukuyamaHiroshima, Japan
    801.6×
  160. 160Fort LauderdaleFlorida, United States
    801.6×
  161. 160MagnaUtah, United States
    801.6×
  162. 160ChikuseiIbaraki, Japan
    801.6×
  163. 160HigashigōSaga, Japan
    801.6×
  164. 164BountifulUtah, United States
    801.6×
  165. 165ŽilinaŽilina Region, Slovakia
    791.6×
  166. 165BerounCentral Bohemia, Czechia
    791.6×
  167. 165San Martin Texmelucan de LabastidaPuebla, Mexico
    791.6×
  168. 168NishiwakiHyōgo, Japan
    791.6×
  169. 169SagaSaga, Japan
    791.6×
  170. 169ŌmutaFukuoka, Japan
    791.6×
  171. 169Ceglie MessapicaApulia, Italy
    791.6×
  172. 172Bishkeklow-cost sensorsBishkek, Kyrgyzstan
    791.6×
  173. 172BratislavaBratislava Region, Slovakia
    791.6×
  174. 174SaseboNagasaki, Japan
    781.6×
  175. 175BellinzonaTicino, Switzerland
    781.6×
  176. 175LakelandFlorida, United States
    781.6×
  177. 177NiihamaEhime, Japan
    781.6×
  178. 177ImabariEhime, Japan
    781.6×
  179. 177AricaArica y Parinacota Region, Chile
    781.6×
  180. 177SōsaChiba, Japan
    781.6×
  181. 181Kakogawachō-honmachiHyōgo, Japan
    781.6×
  182. 181Imarichō-kōSaga, Japan
    781.6×
  183. 183FanlingNorth District, Hong Kong
    771.6×
  184. 184TenriNara, Japan
    771.5×
  185. 185TogitsuNagasaki, Japan
    771.5×
  186. 185Kanzakimachi-kanzakiSaga, Japan
    771.5×
  187. 185LitvínovÚstí nad Labem Region, Czechia
    771.5×
  188. 185Zacatepec de HidalgoMorelos, Mexico
    771.5×
  189. 189Narutochō-mitsuishiTokushima, Japan
    771.5×
  190. 189KureHiroshima, Japan
    771.5×
  191. 189MonacoMunicipality of Monaco, Monaco
    771.5×
  192. 189JesiThe Marches, Italy
    771.5×
  193. 189FairbanksAlaska, United States
    771.5×
  194. 189SodegauraChiba, Japan
    771.5×
  195. 195YukuhashiFukuoka, Japan
    771.5×
  196. 196OnoHyōgo, Japan
    761.5×
  197. 196FukuokaFukuoka, Japan
    761.5×
  198. 196IyoEhime, Japan
    761.5×
  199. 196Karlova VesBratislava Region, Slovakia
    761.5×
  200. 196BolzanoTrentino-Alto Adige, Italy
    761.5×

Top 200 of 1,931 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, December 31, 2023, smogrank.com/history/2023-12-31 (accessed 2 Oct 2026).

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