SmogRank / History / January 20, 2023

Most polluted cities on January 20, 2023

1,231 cities ranked by their average PM2.5 over the day; the worst was Gómez Palacio, Mexico, at 512.4 µg/m³. Each city's own local calendar day.

Bad-air episodes during January 20, 2023. All episodes.

← Gómez Palacio 512.4 µg/m³ 500 µg/m³15 WHO 24-hour guideline
Every city ranked for January 20, 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. 1Gómez PalacioDurango, Mexico
    500+34.2×
  2. 2DushanbeDushanbe, Tajikistan
    37717.6×
  3. 3Bishkeklow-cost sensorsBishkek, Kyrgyzstan
    35616.9×
  4. 4Dhakalow-cost sensorsDhaka Division, Bangladesh
    32015.7×
  5. 5MumbaiMaharashtra, India
    2149.3×
  6. 6Almatylow-cost sensorsAlmaty, Kazakhstan
    2139.2×
  7. 7Abujalow-cost sensorsFCT, Nigeria
    2088.9×
  8. 8Lahorelow-cost sensorsPunjab, Pakistan
    2048.6×
  9. 9AlexandriaAlexandria, Egypt
    1968.0×
  10. 10SalorTashkent Region, Uzbekistan
    1967.9×
  11. 11HanoiHanoi, Vietnam
    1907.4×
  12. 12Kathmandulow-cost sensorsBagmati Province, Nepal
    1897.3×
  13. 13AshgabatAshgabat, Turkmenistan
    1806.5×
  14. 14DelhiDelhi, India
    1806.4×
  15. 15Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1766.1×
  16. 16CholulaPuebla, Mexico
    1675.2×
  17. 17BamakoBamako, Mali
    1655.0×
  18. 18KigaliKigali, Rwanda
    1574.3×
  19. 19HyderabadTelangana, India
    1554.1×
  20. 20Addis AbabaAddis Ababa, Ethiopia
    1554.0×
  21. 21Islamabadlow-cost sensorsIslamabad, Pakistan
    1544.0×
  22. 22Karachilow-cost sensorsSindh, Pakistan
    1523.8×
  23. 22N'DjamenaN’Djaména, Chad
    1523.8×
  24. 24CelayaGuanajuato, Mexico
    1523.8×
  25. 25San Francisco TlalcilalcalpanMéxico, Mexico
    1513.7×
  26. 26Kampalalow-cost sensorsCentral Region, Uganda
    1453.6×
  27. 27WrocławLower Silesia, Poland
    1423.5×
  28. 27SzamotułyGreater Poland, Poland
    1423.5×
  29. 29RacibórzSilesia, Poland
    1413.5×
  30. 30ColomboWestern Province, Sri Lanka
    1413.4×
  31. 31TolucaMéxico, Mexico
    1413.4×
  32. 32Jastrzębie ZdrójSilesia, Poland
    1403.4×
  33. 33Ciudad NezahualcoyotlMéxico, Mexico
    1403.4×
  34. 34ShanghaiShanghai, China
    1373.4×
  35. 35BakuBaki, Azerbaijan
    1373.3×
  36. 36RatchaburiRatchaburi, Thailand
    1363.3×
  37. 37TlaquepaqueJalisco, Mexico
    1353.3×
  38. 38YangonYangon, Myanmar
    1323.2×
  39. 39LamphunLamphun, Thailand
    1313.2×
  40. 40San Mateo AtencoMéxico, Mexico
    1303.2×
  41. 41SukhothaiSukhothai, Thailand
    1263.0×
  42. 42KrapkowiceOpole Voivodeship, Poland
    1222.9×
  43. 42Hacienda Santa FeJalisco, Mexico
    1222.9×
  44. 44Mae SaiChiang Rai, Thailand
    1202.9×
  45. 44ŁaskŁódź Voivodeship, Poland
    1202.9×
  46. 46GuadalajaraJalisco, Mexico
    1192.9×
  47. 47BaghdadBaghdad, Iraq
    1192.9×
  48. 47NanNan, Thailand
    1192.9×
  49. 49TocopillaAntofagasta, Chile
    1172.8×
  50. 50Samut SakhonSamut Sakhon, Thailand
    1152.7×
  51. 51LampangLampang, Thailand
    1152.7×
  52. 51Khlong Sam WaBangkok, Thailand
    1152.7×
  53. 53PoznańGreater Poland, Poland
    1142.7×
  54. 54Chiang RaiChiang Rai, Thailand
    1122.7×
  55. 54Ecatepec de MorelosMéxico, Mexico
    1122.7×
  56. 56Accralow-cost sensorsGreater Accra, Ghana
    1112.6×
  57. 57Mae SotTak, Thailand
    1102.6×
  58. 58Český TěšínMoravian-Silesian Region, Czechia
    1102.6×
  59. 58BohumínMoravian-Silesian Region, Czechia
    1102.6×
  60. 60XonacatlánMéxico, Mexico
    1092.6×
  61. 61PhayaoPhayao, Thailand
    1092.6×
  62. 61Tha YangPhetchaburi, Thailand
    1092.6×
  63. 63Chiang MaiChiang Mai, Thailand
    1082.6×
  64. 64OstravaMoravian-Silesian Region, Czechia
    1072.5×
  65. 65Saphan SungBangkok, Thailand
    1072.5×
  66. 66KłodzkoLower Silesia, Poland
    1062.5×
  67. 66Naucalpan de JuárezMéxico, Mexico
    1062.5×
  68. 68Nong KhaemBangkok, Thailand
    1062.5×
  69. 68Nakhon PathomNakhon Pathom, Thailand
    1062.5×
  70. 70PueblaPuebla, Mexico
    1062.5×
  71. 71ZapopanJalisco, Mexico
    1052.5×
  72. 72Bielsko-BialaSilesia, Poland
    1052.5×
  73. 73Mexico CityMexico City, Mexico
    1042.5×
  74. 74Bang Khun ThianBangkok, Thailand
    1042.4×
  75. 75PhichitPhichit, Thailand
    1032.4×
  76. 76Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1012.4×
  77. 77Nakhon SawanNakhon Sawan, Thailand
    1012.4×
  78. 78Lat KrabangBangkok, Thailand
    1002.4×
  79. 79Kamphaeng PhetKamphaeng Phet, Thailand
    1002.4×
  80. 79UttaraditUttaradit, Thailand
    1002.4×
  81. 81SalamancaGuanajuato, Mexico
    1002.3×
  82. 82PristinaPristina, Kosovo
    992.3×
  83. 83Jelenia GóraLower Silesia, Poland
    992.3×
  84. 84Bang NaBangkok, Thailand
    992.3×
  85. 84Zacatepec de HidalgoMorelos, Mexico
    992.3×
  86. 84MexicaliBaja California, Mexico
    992.3×
  87. 87Bueng KumBangkok, Thailand
    982.3×
  88. 88MinatitlánVeracruz, Mexico
    982.3×
  89. 89Frýdek-MístekMoravian-Silesian Region, Czechia
    982.3×
  90. 90OpoleOpole Voivodeship, Poland
    982.3×
  91. 91Mladá BoleslavCentral Bohemia, Czechia
    972.3×
  92. 92San Juan del RíoQuerétaro, Mexico
    972.2×
  93. 93Ban Khlong PrawetBangkok, Thailand
    962.2×
  94. 94Khan Na YaoBangkok, Thailand
    962.2×
  95. 95HavířovMoravian-Silesian Region, Czechia
    962.2×
  96. 96Ban Samae DamBangkok, Thailand
    962.2×
  97. 96Valašské MeziříčíZlín, Czechia
    962.2×
  98. 98Lak SiBangkok, Thailand
    952.2×
  99. 98San Salvador TizatlalliMéxico, Mexico
    952.2×
  100. 100Tepeji del Río de OcampoHidalgo, Mexico
    952.2×
  101. 101Kędzierzyn-KoźleOpole Voivodeship, Poland
    942.2×
  102. 101San Luis PotosíSan Luis Potosí, Mexico
    942.2×
  103. 103Khlong LuangPathum Thani, Thailand
    942.1×
  104. 104Hua HinPrachuap Khiri Khan, Thailand
    932.1×
  105. 104Nong ChokBangkok, Thailand
    932.1×
  106. 104DěčínÚstí nad Labem Region, Czechia
    932.1×
  107. 107Suphan BuriSuphan Buri, Thailand
    932.1×
  108. 107Ban HouakhouaBokeo, Laos
    932.1×
  109. 107Villa Poeta José Gálvez BarrenecheaLima region, Peru
    932.1×
  110. 110JohannesburgGauteng, South Africa
    932.1×
  111. 111Banja LukaSrpska, Bosnia and Herzegovina
    932.1×
  112. 112Wan ChaiWan Chai, Hong Kong
    922.1×
  113. 113KatowiceSilesia, Poland
    922.1×
  114. 114Hradec KrálovéHradec Králové Region, Czechia
    912.1×
  115. 115LęborkPomerania, Poland
    912.0×
  116. 116Sai MaiBangkok, Thailand
    912.0×
  117. 117Mueang NonthaburiNonthaburi, Thailand
    902.0×
  118. 118Bang KapiBangkok, Thailand
    902.0×
  119. 119KutnoŁódź Voivodeship, Poland
    902.0×
  120. 119Pachuca de SotoHidalgo, Mexico
    902.0×
  121. 121WłocławekKujawsko-Pomorskie, Poland
    892.0×
  122. 121BergenVestland, Norway
    892.0×
  123. 123BangkokBangkok, Thailand
    892.0×
  124. 124Santiago de QuerétaroQuerétaro, Mexico
    892.0×
  125. 125ToruńKujawsko-Pomorskie, Poland
    881.9×
  126. 126San Andrés TuxtlaVeracruz, Mexico
    881.9×
  127. 127SaraburiSaraburi, Thailand
    881.9×
  128. 128ŻyrardówMazovia, Poland
    881.9×
  129. 129eMbalenhleMpumalanga, South Africa
    871.9×
  130. 130PłockMazovia, Poland
    871.9×
  131. 131PhetchabunPhetchabun, Thailand
    861.9×
  132. 132GdyniaPomerania, Poland
    861.9×
  133. 133LoeiLoei, Thailand
    851.8×
  134. 134León de los AldamaGuanajuato, Mexico
    851.8×
  135. 135VereenigingGauteng, South Africa
    851.8×
  136. 136Nakhon RatchasimaNakhon Ratchasima, Thailand
    851.8×
  137. 137VeracruzVeracruz, Mexico
    851.8×
  138. 138BordeauxNew Aquitaine, France
    841.8×
  139. 138ŚwiecieKujawsko-Pomorskie, Poland
    841.8×
  140. 140GuangzhouGuangdong, China
    841.8×
  141. 141TakTak, Thailand
    841.8×
  142. 142Ga-RankuwaNorth West, South Africa
    841.8×
  143. 142LitvínovÚstí nad Labem Region, Czechia
    841.8×
  144. 144Zielona GóraLubusz, Poland
    831.8×
  145. 144San Miguel de AllendeGuanajuato, Mexico
    831.8×
  146. 146SallanchesAuvergne-Rhône-Alpes, France
    831.8×
  147. 147Tin Shui WaiYuen Long, Hong Kong
    831.7×
  148. 148Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    821.7×
  149. 149Bang Bo DistrictSamut Prakan, Thailand
    821.7×
  150. 149BerounCentral Bohemia, Czechia
    821.7×
  151. 149KrakówLesser Poland, Poland
    821.7×
  152. 152Tsuen WanTsuen Wan, Hong Kong
    821.7×
  153. 153MostÚstí nad Labem Region, Czechia
    811.7×
  154. 154LimaLima Province, Peru
    811.7×
  155. 155FanlingNorth District, Hong Kong
    811.7×
  156. 155ZgierzŁódź Voivodeship, Poland
    811.7×
  157. 155KościerzynaPomerania, Poland
    811.7×
  158. 155NacimientoBiobio, Chile
    811.7×
  159. 159Mong KokYau Tsim Mong District, Hong Kong
    801.7×
  160. 160TarnówLesser Poland, Poland
    801.6×
  161. 161SantiagoSantiago Metropolitan, Chile
    801.6×
  162. 162Si Maha PhotPrachin Buri, Thailand
    791.6×
  163. 163Las Palmas de Gran CanariaCanary Islands, Spain
    791.6×
  164. 164VictoriaCentral and Western, Hong Kong
    791.6×
  165. 164CoatzacoalcosVeracruz, Mexico
    791.6×
  166. 166Tai PoTai Po, Hong Kong
    791.6×
  167. 167Kwai ChungKwai Tsing District, Hong Kong
    781.6×
  168. 168ZlínZlín, Czechia
    781.6×
  169. 169SofiaSofia-Capital, Bulgaria
    781.6×
  170. 169SatunSatun, Thailand
    781.6×
  171. 171BelgradeCentral Serbia, Serbia
    781.6×
  172. 171Phra PradaengSamut Prakan, Thailand
    781.6×
  173. 173RancaguaO'Higgins Region, Chile
    771.5×
  174. 174PakxanBolikhamsai, Laos
    761.5×
  175. 175TokozaGauteng, South Africa
    761.5×
  176. 176ChaiyaphumChaiyaphum, Thailand
    761.5×
  177. 176Ústí nad LabemÚstí nad Labem Region, Czechia
    761.5×
  178. 178San CarlosÑuble, Chile
    761.5×
  179. 179Ban ChangRayong, Thailand
    751.5×
  180. 179GdańskPomerania, Poland
    751.5×
  181. 179Puente AltoSantiago Metropolitan, Chile
    751.5×
  182. 182SenicaTrnava Region, Slovakia
    751.5×
  183. 182Belle GladeFlorida, United States
    751.5×
  184. 184TalaganteSantiago Metropolitan, Chile
    751.5×
  185. 184Santa CatarinaNuevo León, Mexico
    751.5×
  186. 184BadgerAlaska, United States
    751.5×
  187. 187HualpénBiobio, Chile
    741.4×
  188. 187AricaArica y Parinacota Region, Chile
    741.4×
  189. 187San Luis de la PazGuanajuato, Mexico
    741.4×
  190. 190RadomMazovia, Poland
    741.4×
  191. 191MeyzieuAuvergne-Rhône-Alpes, France
    741.4×
  192. 191SzczecinWest Pomerania, Poland
    741.4×
  193. 193KazincbarcikaBorsod-Abaúj-Zemplén, Hungary
    741.4×
  194. 193OtwockMazovia, Poland
    741.4×
  195. 193LublinLublin, Poland
    741.4×
  196. 193PraguePrague, Czechia
    741.4×
  197. 197AranyaprathetSa Kaeo, Thailand
    731.4×
  198. 197Sau Mau PingKwun Tong District, Hong Kong
    731.4×
  199. 199Lop BuriLopburi, Thailand
    731.4×
  200. 199LorientBrittany, France
    731.4×

Top 200 of 1,231 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 20, 2023, smogrank.com/history/2023-01-20 (accessed 2 Oct 2026).

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