SmogRank / History / April 12, 2023

Most polluted cities on April 12, 2023

1,421 cities ranked by their average PM2.5 over the day; the worst was N'Djamena, Chad, at 743.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during April 12, 2023. All episodes.

← N'Djamena 743.0 µg/m³ 700 µg/m³15 WHO 24-hour guideline
Every city ranked for April 12, 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
    500+49.5×
  2. 2San Luis PotosíSan Luis Potosí, Mexico
    500+35.7×
  3. 3Tha BoNong Khai, Thailand
    500+31.9×
  4. 4KhartoumKhartoum, Sudan
    32215.7×
  5. 4Mae SaiChiang Rai, Thailand
    32215.7×
  6. 6Ban HouakhouaBokeo, Laos
    26812.9×
  7. 7BeijingBeijing, China
    24911.6×
  8. 8Dhakalow-cost sensorsDhaka Division, Bangladesh
    23810.9×
  9. 9Chiang RaiChiang Rai, Thailand
    23010.3×
  10. 10Chiang MaiChiang Mai, Thailand
    2149.3×
  11. 11Kathmandulow-cost sensorsBagmati Province, Nepal
    2078.8×
  12. 12PhayaoPhayao, Thailand
    1947.8×
  13. 13LampangLampang, Thailand
    1897.3×
  14. 13NanNan, Thailand
    1897.3×
  15. 15LamphunLamphun, Thailand
    1806.5×
  16. 16BloemfonteinFree State, South Africa
    1786.3×
  17. 17DelhiDelhi, India
    1745.9×
  18. 18Lahorelow-cost sensorsPunjab, Pakistan
    1715.6×
  19. 19CoyhaiqueAysén, Chile
    1705.6×
  20. 20Kamphaeng PhetKamphaeng Phet, Thailand
    1705.5×
  21. 21SukhothaiSukhothai, Thailand
    1695.4×
  22. 22LoeiLoei, Thailand
    1685.3×
  23. 23PhraePhrae, Thailand
    1665.1×
  24. 24PakxanBolikhamsai, Laos
    1634.8×
  25. 25Nakhon SawanNakhon Sawan, Thailand
    1604.5×
  26. 26Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1594.4×
  27. 27Mae SotTak, Thailand
    1594.4×
  28. 28Chai NatChai Nat, Thailand
    1584.4×
  29. 29Bang Khun ThianBangkok, Thailand
    1574.3×
  30. 30UttaraditUttaradit, Thailand
    1564.2×
  31. 31PhichitPhichit, Thailand
    1564.2×
  32. 32Sing BuriSing Buri, Thailand
    1564.1×
  33. 33PhetchabunPhetchabun, Thailand
    1554.1×
  34. 34Ubon RatchathaniUbon Ratchathani, Thailand
    1554.0×
  35. 35YangonYangon, Myanmar
    1544.0×
  36. 36San Mateo AtencoMéxico, Mexico
    1544.0×
  37. 37Udon ThaniUdon Thani, Thailand
    1544.0×
  38. 38HyderabadTelangana, India
    1533.9×
  39. 39TakTak, Thailand
    1523.8×
  40. 40Nong Bua LamphuNong Bua Lamphu, Thailand
    1523.8×
  41. 41AshgabatAshgabat, Turkmenistan
    1503.7×
  42. 42MukdahanMukdahan, Thailand
    1483.6×
  43. 43Lop BuriLopburi, Thailand
    1463.6×
  44. 44KalasinKalasin, Thailand
    1413.5×
  45. 45ChaiyaphumChaiyaphum, Thailand
    1393.4×
  46. 46TlaquepaqueJalisco, Mexico
    1393.4×
  47. 47ShenyangLiaoning, China
    1393.4×
  48. 47BamakoBamako, Mali
    1393.4×
  49. 49Suphan BuriSuphan Buri, Thailand
    1373.3×
  50. 50Khon KaenKhon Kaen, Thailand
    1343.3×
  51. 51Roi EtRoi Et, Thailand
    1293.1×
  52. 52HanoiHanoi, Vietnam
    1263.0×
  53. 53JohannesburgGauteng, South Africa
    1253.0×
  54. 53Sakon NakhonSakon Nakhon, Thailand
    1253.0×
  55. 55Si Sa KetSi Sa Ket, Thailand
    1222.9×
  56. 56Bang NaBangkok, Thailand
    1202.9×
  57. 57RatchaburiRatchaburi, Thailand
    1192.8×
  58. 58Nakhon RatchasimaNakhon Ratchasima, Thailand
    1172.8×
  59. 59AguascalientesAguascalientes, Mexico
    1172.8×
  60. 60Islamabadlow-cost sensorsIslamabad, Pakistan
    1162.8×
  61. 61Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    1142.7×
  62. 62Novi PazarCentral Serbia, Serbia
    1132.7×
  63. 62Khlong Sam WaBangkok, Thailand
    1132.7×
  64. 64DushanbeDushanbe, Tajikistan
    1102.6×
  65. 65Hua HinPrachuap Khiri Khan, Thailand
    1102.6×
  66. 66Khan Na YaoBangkok, Thailand
    1082.6×
  67. 67Buri RamBuriram, Thailand
    1062.5×
  68. 68KanchanaburiKanchanaburi, Thailand
    1052.5×
  69. 68GuangzhouGuangdong, China
    1052.5×
  70. 70Si Maha PhotPrachin Buri, Thailand
    1052.5×
  71. 70Puerto AysénAysén, Chile
    1052.5×
  72. 72Ban Samae DamBangkok, Thailand
    1052.5×
  73. 73SaraburiSaraburi, Thailand
    1042.5×
  74. 73Nong KhaemBangkok, Thailand
    1042.5×
  75. 75LublinLublin, Poland
    1032.4×
  76. 75MumbaiMaharashtra, India
    1032.4×
  77. 77ColomboWestern Province, Sri Lanka
    1032.4×
  78. 77Nong ChokBangkok, Thailand
    1032.4×
  79. 79Sai MaiBangkok, Thailand
    1022.4×
  80. 80Lak SiBangkok, Thailand
    1022.4×
  81. 81Saphan SungBangkok, Thailand
    1012.4×
  82. 82BangkokBangkok, Thailand
    1002.4×
  83. 83Hat YaiSongkhla, Thailand
    1002.4×
  84. 83Bueng KumBangkok, Thailand
    1002.4×
  85. 85SalorTashkent Region, Uzbekistan
    992.3×
  86. 85YalaYala, Thailand
    992.3×
  87. 87ZapopanJalisco, Mexico
    992.3×
  88. 88Nakhon PathomNakhon Pathom, Thailand
    992.3×
  89. 89Ga-RankuwaNorth West, South Africa
    982.3×
  90. 89Mueang NonthaburiNonthaburi, Thailand
    982.3×
  91. 89Bang KapiBangkok, Thailand
    982.3×
  92. 92Şabāḩ as SālimMubārak al Kabīr, Kuwait
    982.3×
  93. 93Ban Talat BuengChon Buri, Thailand
    972.3×
  94. 94Karachilow-cost sensorsSindh, Pakistan
    972.3×
  95. 94Khlong LuangPathum Thani, Thailand
    972.3×
  96. 96Surat ThaniSurat Thani, Thailand
    972.2×
  97. 97NarathiwatNarathiwat, Thailand
    962.2×
  98. 98Ban ChangRayong, Thailand
    962.2×
  99. 99Lat KrabangBangkok, Thailand
    942.2×
  100. 100Kampalalow-cost sensorsCentral Region, Uganda
    932.1×
  101. 100MexicaliBaja California, Mexico
    932.1×
  102. 102CelayaGuanajuato, Mexico
    932.1×
  103. 103BaghdadBaghdad, Iraq
    932.1×
  104. 103PristinaPristina, Kosovo
    932.1×
  105. 105IngenioCanary Islands, Spain
    922.1×
  106. 106Ban Khlong PrawetBangkok, Thailand
    922.1×
  107. 107Laem ChabangChon Buri, Thailand
    922.1×
  108. 108Puerto VarasLos Lagos Region, Chile
    922.1×
  109. 109Samut PrakanSamut Prakan, Thailand
    902.0×
  110. 110TrangTrang, Thailand
    892.0×
  111. 110NacimientoBiobio, Chile
    892.0×
  112. 112Santa Cruz de TenerifeCanary Islands, Spain
    892.0×
  113. 113Samut SakhonSamut Sakhon, Thailand
    871.9×
  114. 114Bang Bo DistrictSamut Prakan, Thailand
    871.9×
  115. 114BelmopanCayo District, Belize
    871.9×
  116. 116Puerto del RosarioCanary Islands, Spain
    861.9×
  117. 117Phra PradaengSamut Prakan, Thailand
    861.9×
  118. 117Abidjanlow-cost sensorsAbidjan Autonomous District, Ivory Coast
    861.9×
  119. 119ArrecifeCanary Islands, Spain
    861.8×
  120. 120BrakpanGauteng, South Africa
    851.8×
  121. 121BakuBaki, Azerbaijan
    841.8×
  122. 121ChanthaburiChanthaburi, Thailand
    841.8×
  123. 121Ciudad JuárezChihuahua, Mexico
    841.8×
  124. 124SasolburgFree State, South Africa
    831.8×
  125. 125TratTrat, Thailand
    831.7×
  126. 126AranyaprathetSa Kaeo, Thailand
    831.7×
  127. 126Las Palmas de Gran CanariaCanary Islands, Spain
    831.7×
  128. 128RayongRayong, Thailand
    821.7×
  129. 129BetongYala, Thailand
    811.7×
  130. 129BirminghamAlabama, United States
    811.7×
  131. 131San IsidroCanary Islands, Spain
    801.7×
  132. 132Addis AbabaAddis Ababa, Ethiopia
    801.6×
  133. 133VanderbijlparkGauteng, South Africa
    801.6×
  134. 133SatunSatun, Thailand
    801.6×
  135. 135Nakhon Si ThammaratNakhon Si Thammarat, Thailand
    791.6×
  136. 136NišCentral Serbia, Serbia
    791.6×
  137. 137TijuanaBaja California, Mexico
    791.6×
  138. 138CuranilahueBiobio, Chile
    781.6×
  139. 139La OrotavaCanary Islands, Spain
    781.6×
  140. 139TrentoTrentino-Alto Adige, Italy
    781.6×
  141. 139GuadalajaraJalisco, Mexico
    781.6×
  142. 142RancaguaO'Higgins Region, Chile
    781.6×
  143. 143SaltilloCoahuila, Mexico
    771.5×
  144. 144AgüimesCanary Islands, Spain
    771.5×
  145. 145LawrencevilleGeorgia, United States
    771.5×
  146. 146Banja LukaSrpska, Bosnia and Herzegovina
    771.5×
  147. 147PirotCentral Serbia, Serbia
    761.5×
  148. 148KętrzynWarmia-Masuria, Poland
    761.5×
  149. 148CandelariaCanary Islands, Spain
    761.5×
  150. 150LimaLima Province, Peru
    761.5×
  151. 151BrawleyCalifornia, United States
    761.5×
  152. 151La Crescenta-Montroselow-cost sensorsCalifornia, United States
    761.5×
  153. 153EłkWarmia-Masuria, Poland
    751.5×
  154. 153Viña del MarValparaiso, Chile
    751.5×
  155. 153TalaganteSantiago Metropolitan, Chile
    751.5×
  156. 153Ciudad Benito JuárezNuevo León, Mexico
    751.5×
  157. 157SantiagoSantiago Metropolitan, Chile
    751.5×
  158. 158AcharnésAttica, Greece
    751.5×
  159. 159MaspalomasCanary Islands, Spain
    751.5×
  160. 160KaunasKaunas, Lithuania
    741.4×
  161. 161Santa Cruz de la PalmaCanary Islands, Spain
    741.4×
  162. 161HualpénBiobio, Chile
    741.4×
  163. 163SiedlceMazovia, Poland
    741.4×
  164. 163TalcahuanoBiobio, Chile
    741.4×
  165. 165VisbyGotland, Sweden
    741.4×
  166. 165CopiapóAtacama, Chile
    741.4×
  167. 167PułtuskMazovia, Poland
    741.4×
  168. 167ŁukówLublin, Poland
    741.4×
  169. 167RoveretoTrentino-Alto Adige, Italy
    741.4×
  170. 170PhuketPhuket, Thailand
    741.4×
  171. 171ŻyrardówMazovia, Poland
    731.4×
  172. 172ValjevoCentral Serbia, Serbia
    731.4×
  173. 172Puente AltoSantiago Metropolitan, Chile
    731.4×
  174. 172La UniónLos Ríos Region, Chile
    731.4×
  175. 172AntofagastaAntofagasta, Chile
    731.4×
  176. 172GarcíaNuevo León, Mexico
    731.4×
  177. 177ConakryConakry, Guinea
    731.4×
  178. 178CoronelBiobio, Chile
    721.4×
  179. 179WarsawMazovia, Poland
    721.4×
  180. 180Wan ChaiWan Chai, Hong Kong
    711.3×
  181. 180HualquiBiobio, Chile
    711.3×
  182. 182Granadilla de AbonaCanary Islands, Spain
    711.3×
  183. 183LotaBiobio, Chile
    711.3×
  184. 184VereenigingGauteng, South Africa
    711.3×
  185. 184LęborkPomerania, Poland
    711.3×
  186. 184Ciudad NezahualcoyotlMéxico, Mexico
    711.3×
  187. 187ZamośćLublin, Poland
    701.3×
  188. 187AntananarivoAnalamanga, Madagascar
    701.3×
  189. 189AricaArica y Parinacota Region, Chile
    701.3×
  190. 189TrussvilleAlabama, United States
    701.3×
  191. 191TocopillaAntofagasta, Chile
    701.3×
  192. 192WawerMazovia, Poland
    691.3×
  193. 192XonacatlánMéxico, Mexico
    691.3×
  194. 192RabinalBaja Verapaz, Guatemala
    691.3×
  195. 192RengoO'Higgins Region, Chile
    691.3×
  196. 192San Francisco De BorjaLima region, Peru
    691.3×
  197. 197TarnówLesser Poland, Poland
    691.3×
  198. 197OsornoLos Lagos Region, Chile
    691.3×
  199. 197CalexicoCalifornia, United States
    691.3×
  200. 200RadomMazovia, Poland
    691.3×

Top 200 of 1,421 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, April 12, 2023, smogrank.com/history/2023-04-12 (accessed 2 Oct 2026).

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