SmogRank / History / December 21, 2023

Most polluted cities on December 21, 2023

1,840 cities ranked by their average PM2.5 over the day; the worst was Lahore, Pakistan, at 431.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during December 21, 2023. All episodes.

← Lahore 431.0 µg/m³ 400 µg/m³15 WHO 24-hour guideline
Every city ranked for December 21, 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. 1Lahorelow-cost sensorsPunjab, Pakistan
    500+28.7×
  2. 2DelhiDelhi, India
    36017.0×
  3. 3Ulan BatorUlaanbaatar, Mongolia
    28514.0×
  4. 4SalorTashkent Region, Uzbekistan
    26312.5×
  5. 5Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    26212.5×
  6. 6SarajevoFederation of B&H, Bosnia and Herzegovina
    25712.1×
  7. 7Dhakalow-cost sensorsDhaka Division, Bangladesh
    24911.6×
  8. 8DushanbeDushanbe, Tajikistan
    24611.4×
  9. 9Islamabadlow-cost sensorsIslamabad, Pakistan
    2189.5×
  10. 10KolkataWest Bengal, India
    2149.3×
  11. 11N'DjamenaN’Djaména, Chad
    2119.1×
  12. 12Abujalow-cost sensorsFCT, Nigeria
    1988.1×
  13. 13TetovoTetovo, North Macedonia
    1978.1×
  14. 14Banja LukaSrpska, Bosnia and Herzegovina
    1957.9×
  15. 15HyderabadTelangana, India
    1897.3×
  16. 16ChennaiTamil Nadu, India
    1776.2×
  17. 17Lagoslow-cost sensorsLagos, Nigeria
    1776.1×
  18. 18Kathmandulow-cost sensorsBagmati Province, Nepal
    1756.0×
  19. 19SkopjeGrad Skopje, North Macedonia
    1735.8×
  20. 20Karachilow-cost sensorsSindh, Pakistan
    1725.7×
  21. 21MumbaiMaharashtra, India
    1705.5×
  22. 22CairoCairo, Egypt
    1705.5×
  23. 23BitolaBitola, North Macedonia
    1665.1×
  24. 24Almatylow-cost sensorsAlmaty, Kazakhstan
    1634.9×
  25. 25NišCentral Serbia, Serbia
    1624.8×
  26. 26CapannoriTuscany, Italy
    1614.7×
  27. 27TlaquepaqueJalisco, Mexico
    1614.6×
  28. 28Kampalalow-cost sensorsCentral Region, Uganda
    1564.2×
  29. 29Ciudad Benito JuárezNuevo León, Mexico
    1564.2×
  30. 30KavadarciKavadarci, North Macedonia
    1554.0×
  31. 31IlindenIlinden, North Macedonia
    1533.9×
  32. 32PristinaPristina, Kosovo
    1453.6×
  33. 33VelesVeles, North Macedonia
    1443.5×
  34. 34Santa CatarinaNuevo León, Mexico
    1443.5×
  35. 35Victoria de DurangoDurango, Mexico
    1423.5×
  36. 36Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1413.4×
  37. 37Zacatepec de HidalgoMorelos, Mexico
    1353.3×
  38. 38AlessandriaPiedmont, Italy
    1353.3×
  39. 39CholulaPuebla, Mexico
    1323.2×
  40. 40BeneventoCampania, Italy
    1293.1×
  41. 41San Salvador TizatlalliMéxico, Mexico
    1263.0×
  42. 42Haskovolow-cost sensorsHaskovo, Bulgaria
    1253.0×
  43. 43GrazStyria, Austria
    1233.0×
  44. 44AnconaThe Marches, Italy
    1233.0×
  45. 45VolosThessaly, Greece
    1212.9×
  46. 45HanoiHanoi, Vietnam
    1212.9×
  47. 47NaplesCampania, Italy
    1172.8×
  48. 48GuadalajaraJalisco, Mexico
    1162.8×
  49. 49TocopillaAntofagasta, Chile
    1162.8×
  50. 50SantiagoSantiago Metropolitan, Chile
    1152.7×
  51. 51KochaniKochani, North Macedonia
    1122.7×
  52. 52DejCluj County, Romania
    1112.6×
  53. 52Cluj-NapocaCluj County, Romania
    1112.6×
  54. 54TolucaMéxico, Mexico
    1082.6×
  55. 55BailénAndalusia, Spain
    1072.5×
  56. 56ParedesPorto, Portugal
    1072.5×
  57. 57TurinPiedmont, Italy
    1052.5×
  58. 58JakartaJakarta, Indonesia
    1032.4×
  59. 59KigaliKigali, Rwanda
    992.3×
  60. 60Samut SakhonSamut Sakhon, Thailand
    972.3×
  61. 61Mollet del VallèsCatalonia, Spain
    972.3×
  62. 62RuseRuse, Bulgaria
    962.2×
  63. 63ZapopanJalisco, Mexico
    962.2×
  64. 64Falconara MarittimaThe Marches, Italy
    932.1×
  65. 65MonterreyNuevo León, Mexico
    932.1×
  66. 66Botevgradlow-cost sensorsSofia, Bulgaria
    932.1×
  67. 66Bishkeklow-cost sensorsBishkek, Kyrgyzstan
    932.1×
  68. 68IaşiIași County, Romania
    922.1×
  69. 69YangonYangon, Myanmar
    912.0×
  70. 70Ciudad ApodacaNuevo León, Mexico
    912.0×
  71. 71JesiThe Marches, Italy
    902.0×
  72. 72Ciudad General EscobedoNuevo León, Mexico
    902.0×
  73. 73CraiovaDolj, Romania
    892.0×
  74. 74Jardines de la SillaNuevo León, Mexico
    881.9×
  75. 75BakuBaki, Azerbaijan
    871.9×
  76. 76Puente AltoSantiago Metropolitan, Chile
    861.9×
  77. 77BucharestBucharest, Romania
    861.9×
  78. 77OurenseGalicia, Spain
    861.9×
  79. 79Ceglie MessapicaApulia, Italy
    861.8×
  80. 80ThessaloníkiCentral Macedonia, Greece
    851.8×
  81. 80PueblaPuebla, Mexico
    851.8×
  82. 82MonacoMunicipality of Monaco, Monaco
    841.8×
  83. 83BelgradeCentral Serbia, Serbia
    831.8×
  84. 84GironaCatalonia, Spain
    831.8×
  85. 85Grand RapidsMichigan, United States
    831.7×
  86. 86MexicaliBaja California, Mexico
    831.7×
  87. 87ColomboWestern Province, Sri Lanka
    811.7×
  88. 88PátraWest Greece, Greece
    811.7×
  89. 88Nakhon PathomNakhon Pathom, Thailand
    811.7×
  90. 90East RidgeTennessee, United States
    801.7×
  91. 91TrentoTrentino-Alto Adige, Italy
    801.7×
  92. 92Tuen MunTuen Mun, Hong Kong
    801.6×
  93. 92WolfsbergCarinthia, Austria
    801.6×
  94. 94Cadereyta JiménezNuevo León, Mexico
    791.6×
  95. 95GuangzhouGuangdong, China
    791.6×
  96. 96Wan ChaiWan Chai, Hong Kong
    781.6×
  97. 97BirminghamAlabama, United States
    781.6×
  98. 97KennesawGeorgia, United States
    781.6×
  99. 99Addis AbabaAddis Ababa, Ethiopia
    781.6×
  100. 100SalernoCampania, Italy
    771.6×
  101. 100RoveretoTrentino-Alto Adige, Italy
    771.6×
  102. 102ChattanoogaTennessee, United States
    771.5×
  103. 103ShenyangLiaoning, China
    771.5×
  104. 104PécsBaranya, Hungary
    771.5×
  105. 104RengoO'Higgins Region, Chile
    771.5×
  106. 106CórdobaAndalusia, Spain
    771.5×
  107. 106GyőrGyőr-Moson-Sopron, Hungary
    771.5×
  108. 108Spišská Nová VesKošice Region, Slovakia
    761.5×
  109. 109CelayaGuanajuato, Mexico
    761.5×
  110. 110BogotáBogota D.C., Colombia
    761.5×
  111. 111SulphurLouisiana, United States
    751.5×
  112. 112QuinteroValparaiso, Chile
    751.5×
  113. 113Mueang NonthaburiNonthaburi, Thailand
    751.5×
  114. 113TalaganteSantiago Metropolitan, Chile
    751.5×
  115. 115Gabrovolow-cost sensorsGabrovo, Bulgaria
    741.4×
  116. 115CuernavacaMorelos, Mexico
    741.4×
  117. 117QuillotaValparaiso, Chile
    741.4×
  118. 118LugoGalicia, Spain
    741.4×
  119. 119Nong KhaemBangkok, Thailand
    741.4×
  120. 120RancaguaO'Higgins Region, Chile
    731.4×
  121. 120León de los AldamaGuanajuato, Mexico
    731.4×
  122. 120GreenvilleSouth Carolina, United States
    731.4×
  123. 123AsprópyrgosAttica, Greece
    731.4×
  124. 124ToméBiobio, Chile
    731.4×
  125. 124HualpénBiobio, Chile
    731.4×
  126. 126HumennéPrešov Region, Slovakia
    721.4×
  127. 126SevillaAndalusia, Spain
    721.4×
  128. 126La SpeziaLiguria, Italy
    721.4×
  129. 129San CarlosÑuble, Chile
    721.4×
  130. 130TehuacánPuebla, Mexico
    721.4×
  131. 130CuricóMaule Region, Chile
    721.4×
  132. 132SallanchesAuvergne-Rhône-Alpes, France
    721.3×
  133. 133LleidaCatalonia, Spain
    711.3×
  134. 134ValladolidCastille and León, Spain
    711.3×
  135. 134Viña del MarValparaiso, Chile
    711.3×
  136. 136AthensAttica, Greece
    711.3×
  137. 136AugustaGeorgia, United States
    711.3×
  138. 138Klagenfurt am WörtherseeCarinthia, Austria
    701.3×
  139. 139Silao de la VictoriaGuanajuato, Mexico
    701.3×
  140. 140Khlong LuangPathum Thani, Thailand
    701.3×
  141. 140HualquiBiobio, Chile
    701.3×
  142. 140Ciudad JuárezChihuahua, Mexico
    701.3×
  143. 143ConcónValparaiso, Chile
    701.3×
  144. 144NacimientoBiobio, Chile
    701.3×
  145. 144CopiapóAtacama, Chile
    701.3×
  146. 146TalcahuanoBiobio, Chile
    691.3×
  147. 146TalcaMaule Region, Chile
    691.3×
  148. 146ChillánÑuble, Chile
    691.3×
  149. 149HattiesburgMississippi, United States
    691.3×
  150. 149MadisonWisconsin, United States
    691.3×
  151. 151BangkokBangkok, Thailand
    691.3×
  152. 151Mixquiahuala de JuárezHidalgo, Mexico
    691.3×
  153. 151CoquimboCoquimbo Region, Chile
    691.3×
  154. 151LexingtonNorth Carolina, United States
    691.3×
  155. 155ChiguayanteBiobio, Chile
    691.2×
  156. 155MagnaUtah, United States
    691.2×
  157. 155San Pedro de la PazBiobio, Chile
    691.2×
  158. 158ChicagoIllinois, United States
    691.2×
  159. 159LiberpolisCounty of Osijek-Baranja, Croatia
    691.2×
  160. 160East ChicagoIndiana, United States
    681.2×
  161. 161BolzanoTrentino-Alto Adige, Italy
    681.2×
  162. 161AricaArica y Parinacota Region, Chile
    681.2×
  163. 163CalamaAntofagasta, Chile
    681.2×
  164. 163RockfordIllinois, United States
    681.2×
  165. 165CoronelBiobio, Chile
    681.2×
  166. 165HollandMichigan, United States
    681.2×
  167. 167MillcreekUtah, United States
    671.2×
  168. 168CuranilahueBiobio, Chile
    671.2×
  169. 169Tin Shui WaiYuen Long, Hong Kong
    671.2×
  170. 169QuilpuéValparaiso, Chile
    671.2×
  171. 169CauquenesMaule Region, Chile
    671.2×
  172. 169Terre HauteIndiana, United States
    671.2×
  173. 169JenisonMichigan, United States
    671.2×
  174. 174Oak LawnIllinois, United States
    671.2×
  175. 174ShakopeeMinnesota, United States
    671.2×
  176. 174JohnstownPennsylvania, United States
    671.2×
  177. 177ColumbusGeorgia, United States
    661.2×
  178. 177NorwoodOhio, United States
    661.2×
  179. 177WaukeshaWisconsin, United States
    661.2×
  180. 180AntananarivoAnalamanga, Madagascar
    661.1×
  181. 180Salt Lake CityUtah, United States
    661.1×
  182. 182JasperIndiana, United States
    661.1×
  183. 182ConroeTexas, United States
    661.1×
  184. 184NodaChiba, Japan
    661.1×
  185. 184LafayetteLouisiana, United States
    661.1×
  186. 186Los ÁngelesBiobio, Chile
    661.1×
  187. 186KalamazooMichigan, United States
    661.1×
  188. 188IrapuatoGuanajuato, Mexico
    651.1×
  189. 188MilwaukeeWisconsin, United States
    651.1×
  190. 190JacksonMississippi, United States
    651.1×
  191. 190SpartanburgSouth Carolina, United States
    651.1×
  192. 190WaterlooIowa, United States
    651.1×
  193. 193ValdiviaLos Ríos Region, Chile
    651.1×
  194. 193Misato, SaitamaSaitama, Japan
    651.1×
  195. 195Puerto VarasLos Lagos Region, Chile
    651.1×
  196. 195JeffersonvilleIndiana, United States
    651.1×
  197. 195Bay CityMichigan, United States
    651.1×
  198. 195BurnsvilleMinnesota, United States
    651.1×
  199. 199Tai PoTai Po, Hong Kong
    651.1×
  200. 199NogalesSonora, Mexico
    651.1×

Top 200 of 1,840 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 21, 2023, smogrank.com/history/2023-12-21 (accessed 2 Oct 2026).

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