SmogRank / History / February 1, 2023

Most polluted cities on February 1, 2023

949 cities ranked by their average PM2.5 over the day; the worst was N'Djamena, Chad, at 323.0 µg/m³. Each city's own local calendar day.

← N'Djamena 323.0 µg/m³ 300 µg/m³15 WHO 24-hour guideline
Every city ranked for February 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. 1N'DjamenaN’Djaména, Chad
    49521.5×
  2. 2Dhakalow-cost sensorsDhaka Division, Bangladesh
    2179.5×
  3. 3Tha BoNong Khai, Thailand
    1988.1×
  4. 4Karachilow-cost sensorsSindh, Pakistan
    1937.7×
  5. 5Bang Khun ThianBangkok, Thailand
    1856.9×
  6. 6Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1836.7×
  7. 6HyderabadTelangana, India
    1836.7×
  8. 8Bang NaBangkok, Thailand
    1816.6×
  9. 9Almatylow-cost sensorsAlmaty, Kazakhstan
    1796.4×
  10. 10Lahorelow-cost sensorsPunjab, Pakistan
    1796.4×
  11. 11LoeiLoei, Thailand
    1745.9×
  12. 12LampangLampang, Thailand
    1745.9×
  13. 13Ban Samae DamBangkok, Thailand
    1745.9×
  14. 14DelhiDelhi, India
    1735.8×
  15. 15RatchaburiRatchaburi, Thailand
    1735.8×
  16. 16MumbaiMaharashtra, India
    1725.7×
  17. 17Nong KhaemBangkok, Thailand
    1725.7×
  18. 18Khlong Sam WaBangkok, Thailand
    1715.6×
  19. 19Samut SakhonSamut Sakhon, Thailand
    1705.5×
  20. 20Lat KrabangBangkok, Thailand
    1705.5×
  21. 21SukhothaiSukhothai, Thailand
    1695.4×
  22. 22Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1695.4×
  23. 23Nakhon PathomNakhon Pathom, Thailand
    1695.4×
  24. 24Ban Khlong PrawetBangkok, Thailand
    1685.3×
  25. 25BangkokBangkok, Thailand
    1675.2×
  26. 26Saphan SungBangkok, Thailand
    1675.2×
  27. 27Khlong LuangPathum Thani, Thailand
    1675.2×
  28. 28Sing BuriSing Buri, Thailand
    1665.1×
  29. 29Khan Na YaoBangkok, Thailand
    1665.1×
  30. 29Lak SiBangkok, Thailand
    1665.1×
  31. 31Nong Bua LamphuNong Bua Lamphu, Thailand
    1665.1×
  32. 32Udon ThaniUdon Thani, Thailand
    1665.1×
  33. 33Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    1655.0×
  34. 34Mueang NonthaburiNonthaburi, Thailand
    1655.0×
  35. 35PhraePhrae, Thailand
    1655.0×
  36. 36Mae SotTak, Thailand
    1644.9×
  37. 37Nong ChokBangkok, Thailand
    1644.9×
  38. 38Abujalow-cost sensorsFCT, Nigeria
    1644.9×
  39. 38Bueng KumBangkok, Thailand
    1644.9×
  40. 40Phra PradaengSamut Prakan, Thailand
    1634.9×
  41. 41UttaraditUttaradit, Thailand
    1634.9×
  42. 42Nakhon RatchasimaNakhon Ratchasima, Thailand
    1634.8×
  43. 42Sai MaiBangkok, Thailand
    1634.8×
  44. 44Bang KapiBangkok, Thailand
    1634.8×
  45. 45Lop BuriLopburi, Thailand
    1624.7×
  46. 46Nakhon SawanNakhon Sawan, Thailand
    1624.7×
  47. 47NanNan, Thailand
    1614.6×
  48. 48BitolaBitola, North Macedonia
    1604.5×
  49. 49Bang Bo DistrictSamut Prakan, Thailand
    1594.5×
  50. 50Kathmandulow-cost sensorsBagmati Province, Nepal
    1594.5×
  51. 51PhichitPhichit, Thailand
    1584.4×
  52. 52Kamphaeng PhetKamphaeng Phet, Thailand
    1584.4×
  53. 53NišCentral Serbia, Serbia
    1584.4×
  54. 53Ubon RatchathaniUbon Ratchathani, Thailand
    1584.4×
  55. 55Islamabadlow-cost sensorsIslamabad, Pakistan
    1584.3×
  56. 55MukdahanMukdahan, Thailand
    1584.3×
  57. 57PhetchabunPhetchabun, Thailand
    1574.3×
  58. 58PakxanBolikhamsai, Laos
    1574.3×
  59. 58Ban HouakhouaBokeo, Laos
    1574.3×
  60. 60KalasinKalasin, Thailand
    1564.2×
  61. 61KigaliKigali, Rwanda
    1564.2×
  62. 62Banja LukaSrpska, Bosnia and Herzegovina
    1564.2×
  63. 63Chiang RaiChiang Rai, Thailand
    1564.1×
  64. 64HanoiHanoi, Vietnam
    1564.1×
  65. 64Sakon NakhonSakon Nakhon, Thailand
    1564.1×
  66. 66Buri RamBuriram, Thailand
    1554.1×
  67. 67AranyaprathetSa Kaeo, Thailand
    1554.1×
  68. 68Hua HinPrachuap Khiri Khan, Thailand
    1544.0×
  69. 69RayongRayong, Thailand
    1544.0×
  70. 70Ban Talat BuengChon Buri, Thailand
    1543.9×
  71. 71Ban ChangRayong, Thailand
    1533.9×
  72. 72SaraburiSaraburi, Thailand
    1513.7×
  73. 73Mae SaiChiang Rai, Thailand
    1513.7×
  74. 73ChaiyaphumChaiyaphum, Thailand
    1513.7×
  75. 75Roi EtRoi Et, Thailand
    1503.7×
  76. 76Kampalalow-cost sensorsCentral Region, Uganda
    1463.6×
  77. 77YangonYangon, Myanmar
    1443.5×
  78. 78Si Sa KetSi Sa Ket, Thailand
    1433.5×
  79. 79Chiang MaiChiang Mai, Thailand
    1353.3×
  80. 80Addis AbabaAddis Ababa, Ethiopia
    1333.2×
  81. 81Bishkeklow-cost sensorsBishkek, Kyrgyzstan
    1303.2×
  82. 82ArrecifeCanary Islands, Spain
    1293.1×
  83. 83BakuBaki, Azerbaijan
    1283.1×
  84. 84AlexandriaAlexandria, Egypt
    1243.0×
  85. 85BamakoBamako, Mali
    1212.9×
  86. 86ShanghaiShanghai, China
    1192.8×
  87. 87AmoraSetúbal, Portugal
    1142.7×
  88. 88KanchanaburiKanchanaburi, Thailand
    1132.7×
  89. 89Villa Poeta José Gálvez BarrenecheaLima region, Peru
    1122.7×
  90. 90TratTrat, Thailand
    1112.6×
  91. 91AshgabatAshgabat, Turkmenistan
    1082.6×
  92. 92IrapuatoGuanajuato, Mexico
    1072.5×
  93. 93ChanthaburiChanthaburi, Thailand
    1072.5×
  94. 94TocopillaAntofagasta, Chile
    1052.5×
  95. 95BailénAndalusia, Spain
    1032.4×
  96. 96SallanchesAuvergne-Rhône-Alpes, France
    1012.4×
  97. 97CelayaGuanajuato, Mexico
    1002.4×
  98. 98PristinaPristina, Kosovo
    922.1×
  99. 98PhuketPhuket, Thailand
    922.1×
  100. 100West JordanUtah, United States
    912.0×
  101. 101VigoGalicia, Spain
    892.0×
  102. 102MagnaUtah, United States
    892.0×
  103. 103LimaLima Province, Peru
    881.9×
  104. 104Spišská Nová VesKošice Region, Slovakia
    871.9×
  105. 105San CarlosÑuble, Chile
    851.8×
  106. 105Salt Lake CityUtah, United States
    851.8×
  107. 107BountifulUtah, United States
    851.8×
  108. 108León de los AldamaGuanajuato, Mexico
    841.8×
  109. 109MitrovicëMitrovica, Kosovo
    841.8×
  110. 110BucharestBucharest, Romania
    831.8×
  111. 111Kosovo PoljePristina, Kosovo
    831.7×
  112. 112RedfordMichigan, United States
    821.7×
  113. 113NacimientoBiobio, Chile
    821.7×
  114. 114SalamancaGuanajuato, Mexico
    811.7×
  115. 115Ga-RankuwaNorth West, South Africa
    811.7×
  116. 116QuinteroValparaiso, Chile
    801.6×
  117. 117Puerto del RosarioCanary Islands, Spain
    791.6×
  118. 117RancaguaO'Higgins Region, Chile
    791.6×
  119. 119Nakhon Si ThammaratNakhon Si Thammarat, Thailand
    791.6×
  120. 119QuillotaValparaiso, Chile
    791.6×
  121. 121GuangzhouGuangdong, China
    791.6×
  122. 121SevillaAndalusia, Spain
    791.6×
  123. 121Viña del MarValparaiso, Chile
    791.6×
  124. 121L'Ancienne-LoretteQuebec, Canada
    791.6×
  125. 125GreeleyColorado, United States
    781.6×
  126. 125HerrimanUtah, United States
    781.6×
  127. 127ShawiniganQuebec, Canada
    781.6×
  128. 128SantiagoSantiago Metropolitan, Chile
    771.6×
  129. 129TalaganteSantiago Metropolitan, Chile
    771.5×
  130. 130HualpénBiobio, Chile
    771.5×
  131. 131ToméBiobio, Chile
    761.5×
  132. 132SatunSatun, Thailand
    761.5×
  133. 132TeldeCanary Islands, Spain
    761.5×
  134. 134DushanbeDushanbe, Tajikistan
    751.5×
  135. 135MissoulaMontana, United States
    741.4×
  136. 136HumennéPrešov Region, Slovakia
    741.4×
  137. 136GardanneProvence-Alpes-Côte d'Azur, France
    741.4×
  138. 136ConcónValparaiso, Chile
    741.4×
  139. 136San Pedro de la PazBiobio, Chile
    741.4×
  140. 140TrangTrang, Thailand
    741.4×
  141. 141Accralow-cost sensorsGreater Accra, Ghana
    741.4×
  142. 142HighlandUtah, United States
    731.4×
  143. 143Los ÁngelesBiobio, Chile
    731.4×
  144. 144AricaArica y Parinacota Region, Chile
    731.4×
  145. 145DaxNew Aquitaine, France
    731.4×
  146. 145San Miguel de AllendeGuanajuato, Mexico
    731.4×
  147. 147Hat YaiSongkhla, Thailand
    721.4×
  148. 147GrenobleAuvergne-Rhône-Alpes, France
    721.4×
  149. 149SongkhlaSongkhla, Thailand
    721.4×
  150. 149Puente AltoSantiago Metropolitan, Chile
    721.4×
  151. 151DearbornMichigan, United States
    721.4×
  152. 152ChisinauChișinău Municipality, Moldova
    721.4×
  153. 152CuricóMaule Region, Chile
    721.4×
  154. 154BelgradeCentral Serbia, Serbia
    721.3×
  155. 154San Luis de la PazGuanajuato, Mexico
    721.3×
  156. 156ColomboWestern Province, Sri Lanka
    711.3×
  157. 156LinaresMaule Region, Chile
    711.3×
  158. 158DetroitMichigan, United States
    711.3×
  159. 159CoronelBiobio, Chile
    711.3×
  160. 159AbasoloGuanajuato, Mexico
    711.3×
  161. 161TalcahuanoBiobio, Chile
    711.3×
  162. 161Rivière-des-Prairies–Pointe-aux-TremblesQuebec, Canada
    711.3×
  163. 163HualquiBiobio, Chile
    701.3×
  164. 164RengoO'Higgins Region, Chile
    701.3×
  165. 164CallaoCallao, Peru
    701.3×
  166. 164LouisvilleKentucky, United States
    701.3×
  167. 167PejëPec, Kosovo
    701.3×
  168. 168CauquenesMaule Region, Chile
    701.3×
  169. 169ChiguayanteBiobio, Chile
    691.3×
  170. 170NogalesSonora, Mexico
    691.2×
  171. 171PécsBaranya, Hungary
    681.2×
  172. 172SliemaTas-Sliema, Malta
    681.2×
  173. 172TalcaMaule Region, Chile
    681.2×
  174. 174AmmanAmman, Jordan
    681.2×
  175. 175Botevgradlow-cost sensorsSofia, Bulgaria
    681.2×
  176. 175SalorTashkent Region, Uzbekistan
    681.2×
  177. 175CuranilahueBiobio, Chile
    681.2×
  178. 175ConcepciónBiobio, Chile
    681.2×
  179. 179Valley StationKentucky, United States
    681.2×
  180. 180Mont-de-MarsanNew Aquitaine, France
    671.2×
  181. 180LugoGalicia, Spain
    671.2×
  182. 180CalamaAntofagasta, Chile
    671.2×
  183. 183AlbertvilleAuvergne-Rhône-Alpes, France
    671.2×
  184. 183JeffersonvilleIndiana, United States
    671.2×
  185. 185TemucoAraucania, Chile
    671.2×
  186. 186La SerenaCoquimbo Region, Chile
    671.2×
  187. 186JeffersontownKentucky, United States
    671.2×
  188. 186NorwoodOhio, United States
    671.2×
  189. 189CopiapóAtacama, Chile
    661.2×
  190. 189CincinnatiOhio, United States
    661.2×
  191. 191McAlesterOklahoma, United States
    661.2×
  192. 192OttawaOntario, Canada
    661.1×
  193. 193OremUtah, United States
    661.1×
  194. 194OurenseGalicia, Spain
    661.1×
  195. 195VolosThessaly, Greece
    651.1×
  196. 195DunkirkHauts-de-France, France
    651.1×
  197. 195AntofagastaAntofagasta, Chile
    651.1×
  198. 198TeoGalicia, Spain
    651.1×
  199. 199CartagenaMurcia, Spain
    651.1×
  200. 199ChambéryAuvergne-Rhône-Alpes, France
    651.1×

Top 200 of 949 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, February 1, 2023, smogrank.com/history/2023-02-01 (accessed 2 Oct 2026).

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