SmogRank / History / January 1, 2023

Most polluted cities on January 1, 2023

1,173 cities ranked by their average PM2.5 over the day; the worst was Lagos, Nigeria, at 357.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during January 1, 2023. All episodes.

← Lagos 357.0 µg/m³ 300 µg/m³15 WHO 24-hour guideline
Every city ranked for January 1, 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. 1Lagoslow-cost sensorsLagos, Nigeria
    500+23.8×
  2. 2PljevljaPljevlja, Montenegro
    34616.5×
  3. 3N'DjamenaN’Djaména, Chad
    33616.2×
  4. 4Lahorelow-cost sensorsPunjab, Pakistan
    28914.3×
  5. 5Accralow-cost sensorsGreater Accra, Ghana
    26912.9×
  6. 6Dhakalow-cost sensorsDhaka Division, Bangladesh
    25712.1×
  7. 7CraiovaDolj, Romania
    22510.0×
  8. 8PristinaPristina, Kosovo
    2149.3×
  9. 9DelhiDelhi, India
    2038.5×
  10. 10Abujalow-cost sensorsFCT, Nigeria
    1998.3×
  11. 11NišCentral Serbia, Serbia
    1776.2×
  12. 12Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1756.0×
  13. 13BelgradeCentral Serbia, Serbia
    1745.9×
  14. 14CelayaGuanajuato, Mexico
    1735.8×
  15. 15Karachilow-cost sensorsSindh, Pakistan
    1735.8×
  16. 16DushanbeDushanbe, Tajikistan
    1725.7×
  17. 17Banja LukaSrpska, Bosnia and Herzegovina
    1715.6×
  18. 18ColomboWestern Province, Sri Lanka
    1715.6×
  19. 19Kathmandulow-cost sensorsBagmati Province, Nepal
    1695.4×
  20. 20Ecatepec de MorelosMéxico, Mexico
    1695.4×
  21. 21San AntonioTexas, United States
    1685.3×
  22. 22ZnojmoSouth Moravian, Czechia
    1665.1×
  23. 23ChisinauChișinău Municipality, Moldova
    1655.0×
  24. 24RužomberokŽilina Region, Slovakia
    1644.9×
  25. 25Dimitrovgradlow-cost sensorsHaskovo, Bulgaria
    1644.9×
  26. 26ShanghaiShanghai, China
    1644.9×
  27. 27BadgerAlaska, United States
    1634.9×
  28. 28Islamabadlow-cost sensorsIslamabad, Pakistan
    1624.8×
  29. 29Botevgradlow-cost sensorsSofia, Bulgaria
    1624.8×
  30. 30HanoiHanoi, Vietnam
    1624.8×
  31. 31MumbaiMaharashtra, India
    1614.7×
  32. 32Cluj-NapocaCluj County, Romania
    1604.6×
  33. 33GlendaleArizona, United States
    1584.4×
  34. 34SofiaSofia-Capital, Bulgaria
    1584.4×
  35. 35Mladá BoleslavCentral Bohemia, Czechia
    1584.3×
  36. 36AlexandriaAlexandria, Egypt
    1574.2×
  37. 37HyderabadTelangana, India
    1564.2×
  38. 38IaşiIași County, Romania
    1544.0×
  39. 38Mexico CityMexico City, Mexico
    1544.0×
  40. 40BaghdadBaghdad, Iraq
    1544.0×
  41. 41TraunUpper Austria, Austria
    1533.9×
  42. 42Kampalalow-cost sensorsCentral Region, Uganda
    1533.9×
  43. 43LinzUpper Austria, Austria
    1533.8×
  44. 44Haskovolow-cost sensorsHaskovo, Bulgaria
    1523.8×
  45. 45ThessaloníkiCentral Macedonia, Greece
    1523.8×
  46. 46AthensAttica, Greece
    1493.7×
  47. 47GrazStyria, Austria
    1453.6×
  48. 48SalorTashkent Region, Uzbekistan
    1393.4×
  49. 49Sevlievolow-cost sensorsGabrovo, Bulgaria
    1363.3×
  50. 50BamakoBamako, Mali
    1363.3×
  51. 50BerounCentral Bohemia, Czechia
    1363.3×
  52. 52KrakówLesser Poland, Poland
    1353.3×
  53. 53Villa Poeta José Gálvez BarrenecheaLima region, Peru
    1333.2×
  54. 54WolfsbergCarinthia, Austria
    1313.2×
  55. 55ŽideniceSouth Moravian, Czechia
    1303.2×
  56. 56LimaLima Province, Peru
    1273.1×
  57. 57TempeArizona, United States
    1263.0×
  58. 58ValdemoroMadrid, Spain
    1243.0×
  59. 59Nong KhaemBangkok, Thailand
    1182.8×
  60. 60SevillaAndalusia, Spain
    1172.8×
  61. 61BucharestBucharest, Romania
    1152.7×
  62. 62MartinŽilina Region, Slovakia
    1152.7×
  63. 63WelsUpper Austria, Austria
    1152.7×
  64. 64ViennaVienna, Austria
    1132.7×
  65. 65NacimientoBiobio, Chile
    1122.7×
  66. 66SteyrUpper Austria, Austria
    1102.6×
  67. 67Tha BoNong Khai, Thailand
    1102.6×
  68. 68Almatylow-cost sensorsAlmaty, Kazakhstan
    1102.6×
  69. 69VolosThessaly, Greece
    1092.6×
  70. 70PerchtoldsdorfLower Austria, Austria
    1082.6×
  71. 70ŽilinaŽilina Region, Slovakia
    1082.6×
  72. 72GranadaAndalusia, Spain
    1072.5×
  73. 73Spišská Nová VesKošice Region, Slovakia
    1072.5×
  74. 73Ban Samae DamBangkok, Thailand
    1072.5×
  75. 75WestonFlorida, United States
    1052.5×
  76. 76Hua HinPrachuap Khiri Khan, Thailand
    1042.4×
  77. 76León de los AldamaGuanajuato, Mexico
    1042.4×
  78. 78AmstettenLower Austria, Austria
    1022.4×
  79. 79Sankt PöltenLower Austria, Austria
    1022.4×
  80. 80RatchaburiRatchaburi, Thailand
    1012.4×
  81. 80MödlingLower Austria, Austria
    1012.4×
  82. 80ConroeTexas, United States
    1012.4×
  83. 83OlomoucOlomouc Region, Czechia
    1002.4×
  84. 84KlosterneuburgLower Austria, Austria
    1002.4×
  85. 85Santa Cruz de TenerifeCanary Islands, Spain
    992.3×
  86. 85Hradec KrálovéHradec Králové Region, Czechia
    992.3×
  87. 87LillestrømAkershus, Norway
    992.3×
  88. 88NanNan, Thailand
    982.3×
  89. 88BrnoSouth Moravian, Czechia
    982.3×
  90. 88Khlong Sam WaBangkok, Thailand
    982.3×
  91. 91PátraWest Greece, Greece
    982.3×
  92. 91AustinTexas, United States
    982.3×
  93. 93Mae SotTak, Thailand
    982.3×
  94. 93AmsterdamNorth Holland, The Netherlands
    982.3×
  95. 95Frýdek-MístekMoravian-Silesian Region, Czechia
    972.3×
  96. 96Mae SaiChiang Rai, Thailand
    972.3×
  97. 97BergenVestland, Norway
    972.2×
  98. 98Vranov nad TopľouPrešov Region, Slovakia
    962.2×
  99. 98OsloOslo, Norway
    962.2×
  100. 100EllensburgWashington, United States
    962.2×
  101. 101LamphunLamphun, Thailand
    962.2×
  102. 102Lak SiBangkok, Thailand
    962.2×
  103. 103Bishkeklow-cost sensorsBishkek, Kyrgyzstan
    952.2×
  104. 104SukhothaiSukhothai, Thailand
    952.2×
  105. 104Sai MaiBangkok, Thailand
    952.2×
  106. 106JeddahMecca Region, Saudi Arabia
    942.1×
  107. 107Bang Khun ThianBangkok, Thailand
    932.1×
  108. 108Samut SakhonSamut Sakhon, Thailand
    932.1×
  109. 109Kinshasalow-cost sensorsKinshasa, Democratic Republic of the Congo
    932.1×
  110. 110Chiang RaiChiang Rai, Thailand
    932.1×
  111. 111Tai PoTai Po, Hong Kong
    932.1×
  112. 112Fort LauderdaleFlorida, United States
    922.1×
  113. 113SzegedCsongrád, Hungary
    922.1×
  114. 113DavieFlorida, United States
    922.1×
  115. 115Coconut CreekFlorida, United States
    922.1×
  116. 115FairbanksAlaska, United States
    922.1×
  117. 117KazincbarcikaBorsod-Abaúj-Zemplén, Hungary
    922.1×
  118. 117Tin Shui WaiYuen Long, Hong Kong
    922.1×
  119. 119Mission BendTexas, United States
    912.0×
  120. 119PhoenixArizona, United States
    912.0×
  121. 121Santa Cruz de la PalmaCanary Islands, Spain
    912.0×
  122. 122AcharnésAttica, Greece
    912.0×
  123. 123PhraePhrae, Thailand
    902.0×
  124. 124Nakhon PathomNakhon Pathom, Thailand
    902.0×
  125. 124Las Palmas de Gran CanariaCanary Islands, Spain
    902.0×
  126. 126AshgabatAshgabat, Turkmenistan
    902.0×
  127. 126La OrotavaCanary Islands, Spain
    902.0×
  128. 126LitvínovÚstí nad Labem Region, Czechia
    902.0×
  129. 129Hat YaiSongkhla, Thailand
    902.0×
  130. 129Bueng KumBangkok, Thailand
    902.0×
  131. 131Tha YangPhetchaburi, Thailand
    892.0×
  132. 132Kamphaeng PhetKamphaeng Phet, Thailand
    892.0×
  133. 132Chiang MaiChiang Mai, Thailand
    892.0×
  134. 132UttaraditUttaradit, Thailand
    892.0×
  135. 132Saphan SungBangkok, Thailand
    892.0×
  136. 136PhichitPhichit, Thailand
    881.9×
  137. 137KošiceKošice Region, Slovakia
    881.9×
  138. 137RancaguaO'Higgins Region, Chile
    881.9×
  139. 139LampangLampang, Thailand
    881.9×
  140. 140FanlingNorth District, Hong Kong
    881.9×
  141. 140MóstolesMadrid, Spain
    881.9×
  142. 142KigaliKigali, Rwanda
    881.9×
  143. 142HumennéPrešov Region, Slovakia
    881.9×
  144. 142LoeiLoei, Thailand
    881.9×
  145. 145Wan ChaiWan Chai, Hong Kong
    881.9×
  146. 146AntofagastaAntofagasta, Chile
    871.9×
  147. 146Baton RougeLouisiana, United States
    871.9×
  148. 148Mueang NonthaburiNonthaburi, Thailand
    871.9×
  149. 148Klagenfurt am WörtherseeCarinthia, Austria
    871.9×
  150. 148New OrleansLouisiana, United States
    871.9×
  151. 151Ciudad JuárezChihuahua, Mexico
    871.9×
  152. 152OrchardsWashington, United States
    871.9×
  153. 153Bang KapiBangkok, Thailand
    861.9×
  154. 153FredrikstadØstfold, Norway
    861.9×
  155. 155BloemfonteinFree State, South Africa
    861.9×
  156. 155SantiagoSantiago Metropolitan, Chile
    861.9×
  157. 155MesaArizona, United States
    861.9×
  158. 158PrešovPrešov Region, Slovakia
    861.9×
  159. 158DěčínÚstí nad Labem Region, Czechia
    861.9×
  160. 160Collado-VillalbaMadrid, Spain
    861.8×
  161. 160Santa Anita - Los FicusLima region, Peru
    861.8×
  162. 162ZvolenBanská Bystrica Region, Slovakia
    851.8×
  163. 163BangkokBangkok, Thailand
    851.8×
  164. 163TorreviejaValencia, Spain
    851.8×
  165. 163Khan Na YaoBangkok, Thailand
    851.8×
  166. 166RuseRuse, Bulgaria
    851.8×
  167. 166Sakon NakhonSakon Nakhon, Thailand
    851.8×
  168. 168SaraburiSaraburi, Thailand
    851.8×
  169. 169Puente AltoSantiago Metropolitan, Chile
    841.8×
  170. 170Khlong LuangPathum Thani, Thailand
    841.8×
  171. 170BadhoevedorpNorth Holland, The Netherlands
    841.8×
  172. 172BailénAndalusia, Spain
    841.8×
  173. 172QuinteroValparaiso, Chile
    841.8×
  174. 174PiraeusAttica, Greece
    841.8×
  175. 174HualpénBiobio, Chile
    841.8×
  176. 176PorsgrunnTelemark, Norway
    841.8×
  177. 177Ciudad RealCastille-La Mancha, Spain
    831.8×
  178. 177TrnavaTrnava Region, Slovakia
    831.8×
  179. 177ZlínZlín, Czechia
    831.8×
  180. 180BakuBaki, Azerbaijan
    831.7×
  181. 180East RidgeTennessee, United States
    831.7×
  182. 182Ubon RatchathaniUbon Ratchathani, Thailand
    821.7×
  183. 183AbasoloGuanajuato, Mexico
    821.7×
  184. 184The HagueSouth Holland, The Netherlands
    821.7×
  185. 185Missouri CityTexas, United States
    821.7×
  186. 186AricaArica y Parinacota Region, Chile
    821.7×
  187. 187Suphan BuriSuphan Buri, Thailand
    821.7×
  188. 188Mong KokYau Tsim Mong District, Hong Kong
    811.7×
  189. 188CoronelBiobio, Chile
    811.7×
  190. 188YakimaWashington, United States
    811.7×
  191. 191Nakhon RatchasimaNakhon Ratchasima, Thailand
    811.7×
  192. 191PartizánskeTrenčín Region, Slovakia
    811.7×
  193. 193La SerenaCoquimbo Region, Chile
    811.7×
  194. 194GuangzhouGuangdong, China
    811.7×
  195. 194Jastrzębie ZdrójSilesia, Poland
    811.7×
  196. 196CartagenaMurcia, Spain
    801.7×
  197. 197SatunSatun, Thailand
    801.7×
  198. 197Bang NaBangkok, Thailand
    801.7×
  199. 197TrenčínTrenčín Region, Slovakia
    801.7×
  200. 200CalamaAntofagasta, Chile
    801.6×

Top 200 of 1,173 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, January 1, 2023, smogrank.com/history/2023-01-01 (accessed 2 Oct 2026).

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