SmogRank / History / January 21, 2023

Most polluted cities on January 21, 2023

1,049 cities ranked by their average PM2.5 over the day; the worst was Gómez Palacio, Mexico, at 509.6 µg/m³. Each city's own local calendar day.

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

← Gómez Palacio 509.6 µg/m³ 500 µg/m³15 WHO 24-hour guideline
Every city ranked for January 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. 1Gómez PalacioDurango, Mexico
    500+34.0×
  2. 2DushanbeDushanbe, Tajikistan
    43119.4×
  3. 3Dhakalow-cost sensorsDhaka Division, Bangladesh
    36617.2×
  4. 4Bishkeklow-cost sensorsBishkek, Kyrgyzstan
    28614.1×
  5. 5DelhiDelhi, India
    27313.2×
  6. 6SalorTashkent Region, Uzbekistan
    2179.5×
  7. 7HanoiHanoi, Vietnam
    2038.5×
  8. 8Lahorelow-cost sensorsPunjab, Pakistan
    2028.5×
  9. 9Almatylow-cost sensorsAlmaty, Kazakhstan
    2008.3×
  10. 10Abujalow-cost sensorsFCT, Nigeria
    1988.1×
  11. 11BaghdadBaghdad, Iraq
    1927.6×
  12. 12San Mateo AtencoMéxico, Mexico
    1846.8×
  13. 13AlexandriaAlexandria, Egypt
    1786.2×
  14. 14Kampalalow-cost sensorsCentral Region, Uganda
    1766.1×
  15. 15Kathmandulow-cost sensorsBagmati Province, Nepal
    1756.0×
  16. 16MumbaiMaharashtra, India
    1725.7×
  17. 17CholulaPuebla, Mexico
    1685.4×
  18. 18Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1685.3×
  19. 19Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1634.9×
  20. 20KigaliKigali, Rwanda
    1604.5×
  21. 21BamakoBamako, Mali
    1584.4×
  22. 22AshgabatAshgabat, Turkmenistan
    1584.4×
  23. 23Karachilow-cost sensorsSindh, Pakistan
    1574.3×
  24. 24HyderabadTelangana, India
    1533.9×
  25. 25CelayaGuanajuato, Mexico
    1533.9×
  26. 26San Francisco TlalcilalcalpanMéxico, Mexico
    1513.7×
  27. 27ColomboWestern Province, Sri Lanka
    1483.6×
  28. 28TolucaMéxico, Mexico
    1373.3×
  29. 29RatchaburiRatchaburi, Thailand
    1333.2×
  30. 29LamphunLamphun, Thailand
    1333.2×
  31. 31SukhothaiSukhothai, Thailand
    1283.1×
  32. 32NišCentral Serbia, Serbia
    1263.0×
  33. 33YangonYangon, Myanmar
    1263.0×
  34. 34Mae SaiChiang Rai, Thailand
    1222.9×
  35. 35Banja LukaSrpska, Bosnia and Herzegovina
    1202.9×
  36. 36NanNan, Thailand
    1192.9×
  37. 36N'DjamenaN’Djaména, Chad
    1192.9×
  38. 38Islamabadlow-cost sensorsIslamabad, Pakistan
    1182.8×
  39. 39Mae SotTak, Thailand
    1172.8×
  40. 40PhichitPhichit, Thailand
    1172.8×
  41. 40Khlong Sam WaBangkok, Thailand
    1172.8×
  42. 42LampangLampang, Thailand
    1172.8×
  43. 43XonacatlánMéxico, Mexico
    1162.8×
  44. 43San Luis PotosíSan Luis Potosí, Mexico
    1162.8×
  45. 45San Andrés TuxtlaVeracruz, Mexico
    1142.7×
  46. 46BordeauxNew Aquitaine, France
    1122.7×
  47. 47PristinaPristina, Kosovo
    1122.7×
  48. 48PhayaoPhayao, Thailand
    1112.6×
  49. 49Samut SakhonSamut Sakhon, Thailand
    1102.6×
  50. 50Nong KhaemBangkok, Thailand
    1102.6×
  51. 51Kamphaeng PhetKamphaeng Phet, Thailand
    1092.6×
  52. 51Jastrzębie ZdrójSilesia, Poland
    1092.6×
  53. 53Chiang RaiChiang Rai, Thailand
    1082.6×
  54. 54RacibórzSilesia, Poland
    1082.6×
  55. 55Bang NaBangkok, Thailand
    1082.6×
  56. 56Bang Khun ThianBangkok, Thailand
    1062.5×
  57. 57Ciudad NezahualcoyotlMéxico, Mexico
    1052.5×
  58. 58BeijingBeijing, China
    1052.5×
  59. 59Nakhon PathomNakhon Pathom, Thailand
    1052.5×
  60. 59Accralow-cost sensorsGreater Accra, Ghana
    1052.5×
  61. 61Suphan BuriSuphan Buri, Thailand
    1022.4×
  62. 61Ban Samae DamBangkok, Thailand
    1022.4×
  63. 63BakuBaki, Azerbaijan
    1012.4×
  64. 63Naucalpan de JuárezMéxico, Mexico
    1012.4×
  65. 63SalamancaGuanajuato, Mexico
    1012.4×
  66. 66Chiang MaiChiang Mai, Thailand
    1012.4×
  67. 66Lat KrabangBangkok, Thailand
    1012.4×
  68. 68VeracruzVeracruz, Mexico
    1002.4×
  69. 69UttaraditUttaradit, Thailand
    1002.3×
  70. 70Lak SiBangkok, Thailand
    992.3×
  71. 71TlaquepaqueJalisco, Mexico
    992.3×
  72. 72MinatitlánVeracruz, Mexico
    992.3×
  73. 73Nakhon SawanNakhon Sawan, Thailand
    982.3×
  74. 74Bueng KumBangkok, Thailand
    972.3×
  75. 75GuangzhouGuangdong, China
    962.2×
  76. 75TocopillaAntofagasta, Chile
    962.2×
  77. 75Sai MaiBangkok, Thailand
    962.2×
  78. 78Bang KapiBangkok, Thailand
    962.2×
  79. 79San Salvador TizatlalliMéxico, Mexico
    962.2×
  80. 80Saphan SungBangkok, Thailand
    952.2×
  81. 81Ubon RatchathaniUbon Ratchathani, Thailand
    952.2×
  82. 81BangkokBangkok, Thailand
    952.2×
  83. 81ZapopanJalisco, Mexico
    952.2×
  84. 84BelgradeCentral Serbia, Serbia
    942.2×
  85. 85Khan Na YaoBangkok, Thailand
    942.2×
  86. 86Mueang NonthaburiNonthaburi, Thailand
    942.1×
  87. 86Ecatepec de MorelosMéxico, Mexico
    942.1×
  88. 88BellevueNebraska, United States
    942.1×
  89. 89Hua HinPrachuap Khiri Khan, Thailand
    932.1×
  90. 90Villa Poeta José Gálvez BarrenecheaLima region, Peru
    932.1×
  91. 91PhetchabunPhetchabun, Thailand
    932.1×
  92. 92Nong ChokBangkok, Thailand
    922.1×
  93. 93TakTak, Thailand
    922.1×
  94. 93Mexico CityMexico City, Mexico
    922.1×
  95. 93Santa CatarinaNuevo León, Mexico
    922.1×
  96. 96Khlong LuangPathum Thani, Thailand
    912.0×
  97. 96BéthuneHauts-de-France, France
    912.0×
  98. 98Český TěšínMoravian-Silesian Region, Czechia
    912.0×
  99. 99EindhovenNorth Brabant, The Netherlands
    912.0×
  100. 99GarcíaNuevo León, Mexico
    912.0×
  101. 101Ban Khlong PrawetBangkok, Thailand
    902.0×
  102. 102Nakhon RatchasimaNakhon Ratchasima, Thailand
    902.0×
  103. 103MukdahanMukdahan, Thailand
    902.0×
  104. 104Nong Bua LamphuNong Bua Lamphu, Thailand
    892.0×
  105. 104Bielsko-BialaSilesia, Poland
    892.0×
  106. 106VanderbijlparkGauteng, South Africa
    892.0×
  107. 107LilleHauts-de-France, France
    892.0×
  108. 108OmahaNebraska, United States
    881.9×
  109. 109PakxanBolikhamsai, Laos
    871.9×
  110. 110RoubaixHauts-de-France, France
    871.9×
  111. 111Sakon NakhonSakon Nakhon, Thailand
    871.9×
  112. 112SaraburiSaraburi, Thailand
    871.9×
  113. 113Si Maha PhotPrachin Buri, Thailand
    861.9×
  114. 113NacimientoBiobio, Chile
    861.9×
  115. 115Wan ChaiWan Chai, Hong Kong
    861.9×
  116. 116VenrayLimburg, The Netherlands
    851.8×
  117. 116DouaiHauts-de-France, France
    851.8×
  118. 118TilburgNorth Brabant, The Netherlands
    851.8×
  119. 119ValenciennesHauts-de-France, France
    851.8×
  120. 120LormontNew Aquitaine, France
    851.8×
  121. 121LimaLima Province, Peru
    841.8×
  122. 122Lop BuriLopburi, Thailand
    841.8×
  123. 122Frýdek-MístekMoravian-Silesian Region, Czechia
    841.8×
  124. 124WiganEngland, United Kingdom
    831.8×
  125. 125La CrosseWisconsin, United States
    831.8×
  126. 126LoeiLoei, Thailand
    831.7×
  127. 127RzeszówSubcarpathia, Poland
    821.7×
  128. 127ChaiyaphumChaiyaphum, Thailand
    821.7×
  129. 127OstravaMoravian-Silesian Region, Czechia
    821.7×
  130. 127Santiago de QuerétaroQuerétaro, Mexico
    821.7×
  131. 131ChisinauChișinău Municipality, Moldova
    821.7×
  132. 132Zacatepec de HidalgoMorelos, Mexico
    821.7×
  133. 133Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    821.7×
  134. 134Buri RamBuriram, Thailand
    821.7×
  135. 135's-GravenzandeSouth Holland, The Netherlands
    811.7×
  136. 136Mong KokYau Tsim Mong District, Hong Kong
    811.7×
  137. 137AranyaprathetSa Kaeo, Thailand
    811.7×
  138. 138San CarlosÑuble, Chile
    811.7×
  139. 139PinetownKwaZulu-Natal, South Africa
    801.7×
  140. 140KatowiceSilesia, Poland
    801.7×
  141. 140Ciudad Benito JuárezNuevo León, Mexico
    801.7×
  142. 142HavířovMoravian-Silesian Region, Czechia
    801.6×
  143. 143Tin Shui WaiYuen Long, Hong Kong
    801.6×
  144. 144SatunSatun, Thailand
    801.6×
  145. 144AricaArica y Parinacota Region, Chile
    801.6×
  146. 146Pachuca de SotoHidalgo, Mexico
    791.6×
  147. 147Bang Bo DistrictSamut Prakan, Thailand
    791.6×
  148. 147Sainte-Geneviève-des-BoisÎle-de-France, France
    791.6×
  149. 149Botevgradlow-cost sensorsSofia, Bulgaria
    791.6×
  150. 150RayongRayong, Thailand
    791.6×
  151. 150NijmegenGelderland, The Netherlands
    791.6×
  152. 150SantiagoSantiago Metropolitan, Chile
    791.6×
  153. 153KalasinKalasin, Thailand
    791.6×
  154. 154RadomMazovia, Poland
    781.6×
  155. 154Roi EtRoi Et, Thailand
    781.6×
  156. 154WarringtonEngland, United Kingdom
    781.6×
  157. 154RotterdamSouth Holland, The Netherlands
    781.6×
  158. 154SallanchesAuvergne-Rhône-Alpes, France
    781.6×
  159. 159Saint-QuentinHauts-de-France, France
    781.6×
  160. 160HeerlenLimburg, The Netherlands
    781.6×
  161. 161Ban ChangRayong, Thailand
    781.6×
  162. 161KrapkowiceOpole Voivodeship, Poland
    781.6×
  163. 163Phra PradaengSamut Prakan, Thailand
    781.6×
  164. 163RancaguaO'Higgins Region, Chile
    781.6×
  165. 165MaassluisSouth Holland, The Netherlands
    771.6×
  166. 166Nakhon Si ThammaratNakhon Si Thammarat, Thailand
    771.5×
  167. 167The HagueSouth Holland, The Netherlands
    771.5×
  168. 168TalaganteSantiago Metropolitan, Chile
    771.5×
  169. 168AbasoloGuanajuato, Mexico
    771.5×
  170. 170Addis AbabaAddis Ababa, Ethiopia
    771.5×
  171. 170KanchanaburiKanchanaburi, Thailand
    771.5×
  172. 172Udon ThaniUdon Thani, Thailand
    761.5×
  173. 172BredaNorth Brabant, The Netherlands
    761.5×
  174. 172QuinteroValparaiso, Chile
    761.5×
  175. 175Tsuen WanTsuen Wan, Hong Kong
    761.5×
  176. 175RidderkerkSouth Holland, The Netherlands
    761.5×
  177. 177HillegomSouth Holland, The Netherlands
    761.5×
  178. 178ConcónValparaiso, Chile
    751.5×
  179. 178MonterreyNuevo León, Mexico
    751.5×
  180. 180EtwatwaGauteng, South Africa
    751.5×
  181. 181PhuketPhuket, Thailand
    751.5×
  182. 181AlessandriaPiedmont, Italy
    751.5×
  183. 183Si Sa KetSi Sa Ket, Thailand
    751.5×
  184. 183Puente AltoSantiago Metropolitan, Chile
    751.5×
  185. 185TratTrat, Thailand
    741.4×
  186. 185BohumínMoravian-Silesian Region, Czechia
    741.4×
  187. 187UtrechtUtrecht, The Netherlands
    741.4×
  188. 188CoatzacoalcosVeracruz, Mexico
    741.4×
  189. 189SasolburgFree State, South Africa
    741.4×
  190. 189VictoriaCentral and Western, Hong Kong
    741.4×
  191. 191AsprópyrgosAttica, Greece
    741.4×
  192. 191LillestrømAkershus, Norway
    741.4×
  193. 191San Luis de la PazGuanajuato, Mexico
    741.4×
  194. 191AguascalientesAguascalientes, Mexico
    741.4×
  195. 195TarnówLesser Poland, Poland
    741.4×
  196. 195TokozaGauteng, South Africa
    741.4×
  197. 195Ga-RankuwaNorth West, South Africa
    741.4×
  198. 195EnschedeOverijssel, The Netherlands
    741.4×
  199. 195RengoO'Higgins Region, Chile
    741.4×
  200. 200NairobiNairobi County, Kenya
    731.4×

Top 200 of 1,049 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 21, 2023, smogrank.com/history/2023-01-21 (accessed 2 Oct 2026).

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