SmogRank / History / January 31, 2023

Most polluted cities on January 31, 2023

1,098 cities ranked by their average PM2.5 over the day; the worst was Dhaka, Bangladesh, at 255.0 µg/m³. Each city's own local calendar day.

← Dhaka 255.0 µg/m³ 200 µg/m³15 WHO 24-hour guideline
Every city ranked for January 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. 1Dhakalow-cost sensorsDhaka Division, Bangladesh
    36017.0×
  2. 2Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1988.2×
  3. 3Abujalow-cost sensorsFCT, Nigeria
    1856.9×
  4. 4Kathmandulow-cost sensorsBagmati Province, Nepal
    1826.7×
  5. 5Lahorelow-cost sensorsPunjab, Pakistan
    1816.6×
  6. 6N'DjamenaN’Djaména, Chad
    1796.4×
  7. 7MumbaiMaharashtra, India
    1796.3×
  8. 8Tha BoNong Khai, Thailand
    1776.2×
  9. 9DelhiDelhi, India
    1756.0×
  10. 10Nong Bua LamphuNong Bua Lamphu, Thailand
    1695.4×
  11. 11Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1685.3×
  12. 12LampangLampang, Thailand
    1665.2×
  13. 12LoeiLoei, Thailand
    1665.2×
  14. 14HanoiHanoi, Vietnam
    1634.9×
  15. 15SukhothaiSukhothai, Thailand
    1634.8×
  16. 16HyderabadTelangana, India
    1624.7×
  17. 17PhraePhrae, Thailand
    1594.5×
  18. 18Samut SakhonSamut Sakhon, Thailand
    1594.5×
  19. 19DushanbeDushanbe, Tajikistan
    1594.5×
  20. 20Mae SotTak, Thailand
    1594.4×
  21. 20Nong KhaemBangkok, Thailand
    1594.4×
  22. 22YangonYangon, Myanmar
    1584.3×
  23. 22Bang Khun ThianBangkok, Thailand
    1584.3×
  24. 24NanNan, Thailand
    1574.3×
  25. 25RatchaburiRatchaburi, Thailand
    1574.3×
  26. 26Khlong Sam WaBangkok, Thailand
    1574.3×
  27. 27Sing BuriSing Buri, Thailand
    1564.2×
  28. 28Almatylow-cost sensorsAlmaty, Kazakhstan
    1554.1×
  29. 29BakuBaki, Azerbaijan
    1554.1×
  30. 30Udon ThaniUdon Thani, Thailand
    1554.0×
  31. 31Kampalalow-cost sensorsCentral Region, Uganda
    1554.0×
  32. 32Nakhon PathomNakhon Pathom, Thailand
    1544.0×
  33. 33Lak SiBangkok, Thailand
    1543.9×
  34. 34Ban Samae DamBangkok, Thailand
    1533.9×
  35. 35UttaraditUttaradit, Thailand
    1533.9×
  36. 36PakxanBolikhamsai, Laos
    1533.9×
  37. 36Khan Na YaoBangkok, Thailand
    1533.9×
  38. 38Islamabadlow-cost sensorsIslamabad, Pakistan
    1533.9×
  39. 39PhetchabunPhetchabun, Thailand
    1533.9×
  40. 40Suphan BuriSuphan Buri, Thailand
    1533.9×
  41. 41BamakoBamako, Mali
    1523.8×
  42. 42BangkokBangkok, Thailand
    1523.8×
  43. 43Mueang NonthaburiNonthaburi, Thailand
    1523.8×
  44. 44Bang NaBangkok, Thailand
    1523.8×
  45. 44Lat KrabangBangkok, Thailand
    1523.8×
  46. 46Nakhon SawanNakhon Sawan, Thailand
    1523.8×
  47. 46Khlong LuangPathum Thani, Thailand
    1523.8×
  48. 48PhichitPhichit, Thailand
    1513.7×
  49. 49Kamphaeng PhetKamphaeng Phet, Thailand
    1503.7×
  50. 50Sai MaiBangkok, Thailand
    1503.7×
  51. 51Nong ChokBangkok, Thailand
    1493.7×
  52. 52Saphan SungBangkok, Thailand
    1483.6×
  53. 53ChaiyaphumChaiyaphum, Thailand
    1473.6×
  54. 54Bang KapiBangkok, Thailand
    1463.6×
  55. 55Bueng KumBangkok, Thailand
    1453.6×
  56. 56KigaliKigali, Rwanda
    1433.5×
  57. 57Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    1403.4×
  58. 58Buri RamBuriram, Thailand
    1373.4×
  59. 59Nakhon RatchasimaNakhon Ratchasima, Thailand
    1373.3×
  60. 60KalasinKalasin, Thailand
    1363.3×
  61. 61BaghdadBaghdad, Iraq
    1343.3×
  62. 62Ban Khlong PrawetBangkok, Thailand
    1333.2×
  63. 63Banja LukaSrpska, Bosnia and Herzegovina
    1293.1×
  64. 64Phra PradaengSamut Prakan, Thailand
    1283.1×
  65. 65Chiang RaiChiang Rai, Thailand
    1263.0×
  66. 66Bang Bo DistrictSamut Prakan, Thailand
    1263.0×
  67. 67Ubon RatchathaniUbon Ratchathani, Thailand
    1243.0×
  68. 68Sakon NakhonSakon Nakhon, Thailand
    1233.0×
  69. 69Si Maha PhotPrachin Buri, Thailand
    1222.9×
  70. 70Ban HouakhouaBokeo, Laos
    1222.9×
  71. 71AnconaThe Marches, Italy
    1212.9×
  72. 72SallanchesAuvergne-Rhône-Alpes, France
    1202.9×
  73. 73Hua HinPrachuap Khiri Khan, Thailand
    1192.9×
  74. 74AshgabatAshgabat, Turkmenistan
    1182.8×
  75. 74Bishkeklow-cost sensorsBishkek, Kyrgyzstan
    1182.8×
  76. 76Mae SaiChiang Rai, Thailand
    1182.8×
  77. 76Roi EtRoi Et, Thailand
    1182.8×
  78. 78MukdahanMukdahan, Thailand
    1172.8×
  79. 79TocopillaAntofagasta, Chile
    1172.8×
  80. 80AranyaprathetSa Kaeo, Thailand
    1152.8×
  81. 81AlessandriaPiedmont, Italy
    1152.7×
  82. 82Ban ChangRayong, Thailand
    1132.7×
  83. 83Chiang MaiChiang Mai, Thailand
    1122.7×
  84. 83SaraburiSaraburi, Thailand
    1122.7×
  85. 85RayongRayong, Thailand
    1122.7×
  86. 86TurinPiedmont, Italy
    1112.6×
  87. 87ShanghaiShanghai, China
    1102.6×
  88. 88SalorTashkent Region, Uzbekistan
    1072.5×
  89. 89Spišská Nová VesKošice Region, Slovakia
    1062.5×
  90. 90TratTrat, Thailand
    1062.5×
  91. 91Botevgradlow-cost sensorsSofia, Bulgaria
    1042.4×
  92. 91IrapuatoGuanajuato, Mexico
    1042.4×
  93. 93JesiThe Marches, Italy
    1022.4×
  94. 94Falconara MarittimaThe Marches, Italy
    1012.4×
  95. 95CelayaGuanajuato, Mexico
    982.3×
  96. 96GuangzhouGuangdong, China
    962.2×
  97. 97Si Sa KetSi Sa Ket, Thailand
    952.2×
  98. 98ChanthaburiChanthaburi, Thailand
    942.2×
  99. 98SalemOregon, United States
    942.2×
  100. 100Ban Talat BuengChon Buri, Thailand
    942.1×
  101. 101KošiceKošice Region, Slovakia
    932.1×
  102. 102KanchanaburiKanchanaburi, Thailand
    932.1×
  103. 102Villa Poeta José Gálvez BarrenecheaLima region, Peru
    932.1×
  104. 104BeijingBeijing, China
    922.1×
  105. 105BucharestBucharest, Romania
    922.1×
  106. 106AlexandriaAlexandria, Egypt
    922.1×
  107. 107PhuketPhuket, Thailand
    902.0×
  108. 108NaplesCampania, Italy
    892.0×
  109. 109Surat ThaniSurat Thani, Thailand
    892.0×
  110. 109BeneventoCampania, Italy
    892.0×
  111. 111ChisinauChișinău Municipality, Moldova
    892.0×
  112. 111ColomboWestern Province, Sri Lanka
    892.0×
  113. 113SalamancaGuanajuato, Mexico
    892.0×
  114. 114LimaLima Province, Peru
    881.9×
  115. 115MeylanAuvergne-Rhône-Alpes, France
    861.8×
  116. 116WoodburnOregon, United States
    841.8×
  117. 117HumennéPrešov Region, Slovakia
    831.8×
  118. 118GrenobleAuvergne-Rhône-Alpes, France
    831.7×
  119. 119AnnemasseAuvergne-Rhône-Alpes, France
    821.7×
  120. 119NacimientoBiobio, Chile
    821.7×
  121. 121PrešovPrešov Region, Slovakia
    811.7×
  122. 122San CarlosÑuble, Chile
    801.6×
  123. 123León de los AldamaGuanajuato, Mexico
    791.6×
  124. 124ButteMontana, United States
    781.6×
  125. 125TrangTrang, Thailand
    781.6×
  126. 126Haskovolow-cost sensorsHaskovo, Bulgaria
    771.5×
  127. 126AlbertvilleAuvergne-Rhône-Alpes, France
    771.5×
  128. 128SantiagoSantiago Metropolitan, Chile
    771.5×
  129. 129VolosThessaly, Greece
    761.5×
  130. 130Addis AbabaAddis Ababa, Ethiopia
    761.5×
  131. 130Nakhon Si ThammaratNakhon Si Thammarat, Thailand
    761.5×
  132. 130HualpénBiobio, Chile
    761.5×
  133. 133PiraeusAttica, Greece
    751.5×
  134. 134Ga-RankuwaNorth West, South Africa
    751.5×
  135. 134RancaguaO'Higgins Region, Chile
    751.5×
  136. 136Port AlberniBritish Columbia, Canada
    751.5×
  137. 137SatunSatun, Thailand
    741.4×
  138. 138ToméBiobio, Chile
    741.4×
  139. 138TalaganteSantiago Metropolitan, Chile
    741.4×
  140. 140Clermont-FerrandAuvergne-Rhône-Alpes, France
    731.4×
  141. 141RoseburgOregon, United States
    731.4×
  142. 142JeddahMecca Region, Saudi Arabia
    731.4×
  143. 143Dimitrovgradlow-cost sensorsHaskovo, Bulgaria
    731.4×
  144. 144AbasoloGuanajuato, Mexico
    721.4×
  145. 145Viña del MarValparaiso, Chile
    721.4×
  146. 145San Luis de la PazGuanajuato, Mexico
    721.4×
  147. 145San Pedro de la PazBiobio, Chile
    721.4×
  148. 148Puente AltoSantiago Metropolitan, Chile
    711.3×
  149. 149QuillotaValparaiso, Chile
    711.3×
  150. 149LinaresMaule Region, Chile
    711.3×
  151. 151Accralow-cost sensorsGreater Accra, Ghana
    711.3×
  152. 151CuricóMaule Region, Chile
    711.3×
  153. 153AricaArica y Parinacota Region, Chile
    711.3×
  154. 154TalcahuanoBiobio, Chile
    701.3×
  155. 155ParklandWashington, United States
    701.3×
  156. 156Forest GroveOregon, United States
    701.3×
  157. 157CoronelBiobio, Chile
    691.3×
  158. 157VancouverWashington, United States
    691.3×
  159. 159PátraWest Greece, Greece
    691.3×
  160. 159MonacoMunicipality of Monaco, Monaco
    691.3×
  161. 161ChambéryAuvergne-Rhône-Alpes, France
    691.3×
  162. 161CourtenayBritish Columbia, Canada
    691.3×
  163. 163RengoO'Higgins Region, Chile
    691.2×
  164. 163ConcónValparaiso, Chile
    691.2×
  165. 165PristinaPristina, Kosovo
    691.2×
  166. 166Hat YaiSongkhla, Thailand
    691.2×
  167. 166CalamaAntofagasta, Chile
    691.2×
  168. 168TrentoTrentino-Alto Adige, Italy
    681.2×
  169. 169QuinteroValparaiso, Chile
    681.2×
  170. 170CopiapóAtacama, Chile
    681.2×
  171. 170Ciudad JuárezChihuahua, Mexico
    681.2×
  172. 172HualquiBiobio, Chile
    671.2×
  173. 172VisaliaCalifornia, United States
    671.2×
  174. 174ManosqueProvence-Alpes-Côte d'Azur, France
    671.2×
  175. 174ConcepciónBiobio, Chile
    671.2×
  176. 174TigardOregon, United States
    671.2×
  177. 177Cluj-NapocaCluj County, Romania
    671.2×
  178. 177DuncanBritish Columbia, Canada
    671.2×
  179. 179La SerenaCoquimbo Region, Chile
    671.2×
  180. 179AntofagastaAntofagasta, Chile
    671.2×
  181. 181NairobiNairobi County, Kenya
    661.2×
  182. 181McMinnvilleOregon, United States
    661.2×
  183. 183GreeleyColorado, United States
    661.1×
  184. 184PejëPec, Kosovo
    661.1×
  185. 185Joué-lès-ToursCentre-Val de Loire, France
    661.1×
  186. 185CuranilahueBiobio, Chile
    661.1×
  187. 187Los ÁngelesBiobio, Chile
    651.1×
  188. 188San Francisco De BorjaLima region, Peru
    651.1×
  189. 189SongkhlaSongkhla, Thailand
    651.1×
  190. 189ChâteaurouxCentre-Val de Loire, France
    651.1×
  191. 189LillestrømAkershus, Norway
    651.1×
  192. 189TalcaMaule Region, Chile
    651.1×
  193. 189L'Ancienne-LoretteQuebec, Canada
    651.1×
  194. 194Gabrovolow-cost sensorsGabrovo, Bulgaria
    651.1×
  195. 194ChiguayanteBiobio, Chile
    651.1×
  196. 194ClemmonsNorth Carolina, United States
    651.1×
  197. 194KentWashington, United States
    651.1×
  198. 198MilwaukieOregon, United States
    641.1×
  199. 199CranbrookBritish Columbia, Canada
    641.1×
  200. 200San Miguel de AllendeGuanajuato, Mexico
    641.1×

Top 200 of 1,098 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 31, 2023, smogrank.com/history/2023-01-31 (accessed 2 Oct 2026).

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