SmogRank / History / April 2, 2023

Most polluted cities on April 2, 2023

1,515 cities ranked by their average PM2.5 over the day; the worst was Mae Sai, Thailand, at 296.0 µg/m³. Each city's own local calendar day.

← Mae Sai 296.0 µg/m³ 200 µg/m³15 WHO 24-hour guideline
Every city ranked for April 2, 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. 1Mae SaiChiang Rai, Thailand
    44119.7×
  2. 2Chiang RaiChiang Rai, Thailand
    27713.5×
  3. 3Ban HouakhouaBokeo, Laos
    27213.1×
  4. 4ReykjavíkCapital Region, Iceland
    26412.6×
  5. 5Chiang MaiChiang Mai, Thailand
    25512.0×
  6. 6PhayaoPhayao, Thailand
    2219.7×
  7. 7LamphunLamphun, Thailand
    2058.7×
  8. 8LampangLampang, Thailand
    1957.9×
  9. 9NanNan, Thailand
    1937.7×
  10. 10BamakoBamako, Mali
    1856.9×
  11. 11N'DjamenaN’Djaména, Chad
    1786.3×
  12. 12BeijingBeijing, China
    1705.5×
  13. 13Lahorelow-cost sensorsPunjab, Pakistan
    1675.3×
  14. 14PhraePhrae, Thailand
    1675.2×
  15. 15LoeiLoei, Thailand
    1665.2×
  16. 16Dhakalow-cost sensorsDhaka Division, Bangladesh
    1645.0×
  17. 17Tha BoNong Khai, Thailand
    1624.8×
  18. 18SukhothaiSukhothai, Thailand
    1604.6×
  19. 19Kamphaeng PhetKamphaeng Phet, Thailand
    1594.4×
  20. 20AlexandriaAlexandria, Egypt
    1564.2×
  21. 21UttaraditUttaradit, Thailand
    1554.1×
  22. 22TlaquepaqueJalisco, Mexico
    1554.0×
  23. 23Mae SotTak, Thailand
    1544.0×
  24. 24Yerevanlow-cost sensorsYerevan, Armenia
    1544.0×
  25. 25Udon ThaniUdon Thani, Thailand
    1423.5×
  26. 26HyderabadTelangana, India
    1413.5×
  27. 27ShenyangLiaoning, China
    1383.4×
  28. 28Ubon RatchathaniUbon Ratchathani, Thailand
    1373.3×
  29. 28PhichitPhichit, Thailand
    1373.3×
  30. 30PakxanBolikhamsai, Laos
    1363.3×
  31. 31Nong Bua LamphuNong Bua Lamphu, Thailand
    1343.2×
  32. 32San Mateo AtencoMéxico, Mexico
    1303.1×
  33. 33MukdahanMukdahan, Thailand
    1293.1×
  34. 34DelhiDelhi, India
    1273.1×
  35. 35Bang Khun ThianBangkok, Thailand
    1212.9×
  36. 36Ciudad JuárezChihuahua, Mexico
    1212.9×
  37. 37PhetchabunPhetchabun, Thailand
    1212.9×
  38. 38Ga-RankuwaNorth West, South Africa
    1192.8×
  39. 39GuangzhouGuangdong, China
    1172.8×
  40. 40CelayaGuanajuato, Mexico
    1122.7×
  41. 41Nakhon SawanNakhon Sawan, Thailand
    1102.6×
  42. 42XonacatlánMéxico, Mexico
    1092.6×
  43. 43Ciudad NezahualcoyotlMéxico, Mexico
    1072.5×
  44. 44Abujalow-cost sensorsFCT, Nigeria
    1062.5×
  45. 45Sing BuriSing Buri, Thailand
    1052.5×
  46. 46MexicaliBaja California, Mexico
    1042.5×
  47. 47KanchanaburiKanchanaburi, Thailand
    1042.4×
  48. 48SantiagoSantiago Metropolitan, Chile
    1012.4×
  49. 49Si Sa KetSi Sa Ket, Thailand
    992.3×
  50. 50NacimientoBiobio, Chile
    992.3×
  51. 51BaghdadBaghdad, Iraq
    982.3×
  52. 52Puerto AysénAysén, Chile
    982.3×
  53. 53Lop BuriLopburi, Thailand
    972.3×
  54. 54Suphan BuriSuphan Buri, Thailand
    972.2×
  55. 55SalorTashkent Region, Uzbekistan
    962.2×
  56. 55Sakon NakhonSakon Nakhon, Thailand
    962.2×
  57. 55TalaganteSantiago Metropolitan, Chile
    962.2×
  58. 58San Salvador TizatlalliMéxico, Mexico
    962.2×
  59. 59ChaiyaphumChaiyaphum, Thailand
    952.2×
  60. 59San Francisco TlalcilalcalpanMéxico, Mexico
    952.2×
  61. 61Roi EtRoi Et, Thailand
    952.2×
  62. 62TolucaMéxico, Mexico
    952.2×
  63. 63CoyhaiqueAysén, Chile
    942.2×
  64. 64RatchaburiRatchaburi, Thailand
    942.2×
  65. 64HanoiHanoi, Vietnam
    942.2×
  66. 66GarcíaNuevo León, Mexico
    942.1×
  67. 67KalasinKalasin, Thailand
    922.1×
  68. 67QuinteroValparaiso, Chile
    922.1×
  69. 69Si Maha PhotPrachin Buri, Thailand
    922.1×
  70. 70RabinalBaja Verapaz, Guatemala
    902.0×
  71. 70Guatemala CityGuatemala, Guatemala
    902.0×
  72. 72QuillotaValparaiso, Chile
    902.0×
  73. 73Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    902.0×
  74. 74Bang NaBangkok, Thailand
    892.0×
  75. 74MonterreyNuevo León, Mexico
    892.0×
  76. 76Kampalalow-cost sensorsCentral Region, Uganda
    881.9×
  77. 76Viña del MarValparaiso, Chile
    881.9×
  78. 78TemucoAraucania, Chile
    881.9×
  79. 79San CarlosÑuble, Chile
    881.9×
  80. 79HualquiBiobio, Chile
    881.9×
  81. 81Santiago de QuerétaroQuerétaro, Mexico
    881.9×
  82. 82YangonYangon, Myanmar
    881.9×
  83. 83ChillánÑuble, Chile
    871.9×
  84. 83Ciudad ApodacaNuevo León, Mexico
    871.9×
  85. 85Mexico CityMexico City, Mexico
    871.9×
  86. 86Los ÁngelesBiobio, Chile
    871.9×
  87. 86IrapuatoGuanajuato, Mexico
    871.9×
  88. 88Novi PazarCentral Serbia, Serbia
    861.9×
  89. 89PristinaPristina, Kosovo
    861.9×
  90. 89RengoO'Higgins Region, Chile
    861.9×
  91. 91Almatylow-cost sensorsAlmaty, Kazakhstan
    851.8×
  92. 91Santa CatarinaNuevo León, Mexico
    851.8×
  93. 91SalamancaGuanajuato, Mexico
    851.8×
  94. 94ShanghaiShanghai, China
    851.8×
  95. 94PueblaPuebla, Mexico
    851.8×
  96. 96Nakhon RatchasimaNakhon Ratchasima, Thailand
    841.8×
  97. 97Naucalpan de JuárezMéxico, Mexico
    841.8×
  98. 97Cadereyta JiménezNuevo León, Mexico
    841.8×
  99. 99ConcónValparaiso, Chile
    841.8×
  100. 100Khlong Sam WaBangkok, Thailand
    831.8×
  101. 101Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    831.8×
  102. 101GuadalajaraJalisco, Mexico
    831.8×
  103. 103Pachuca de SotoHidalgo, Mexico
    831.8×
  104. 103ValdiviaLos Ríos Region, Chile
    831.8×
  105. 105RancaguaO'Higgins Region, Chile
    831.7×
  106. 106TokozaGauteng, South Africa
    831.7×
  107. 106Islamabadlow-cost sensorsIslamabad, Pakistan
    831.7×
  108. 106Gómez PalacioDurango, Mexico
    831.7×
  109. 109San Miguel de AllendeGuanajuato, Mexico
    821.7×
  110. 110HualpénBiobio, Chile
    821.7×
  111. 110San Luis PotosíSan Luis Potosí, Mexico
    821.7×
  112. 112ValjevoCentral Serbia, Serbia
    821.7×
  113. 112Tepeji del Río de OcampoHidalgo, Mexico
    821.7×
  114. 114NišCentral Serbia, Serbia
    821.7×
  115. 115Nong KhaemBangkok, Thailand
    811.7×
  116. 115Buri RamBuriram, Thailand
    811.7×
  117. 115Puente AltoSantiago Metropolitan, Chile
    811.7×
  118. 118TocopillaAntofagasta, Chile
    811.7×
  119. 119Ban Samae DamBangkok, Thailand
    801.7×
  120. 120JohannesburgGauteng, South Africa
    801.7×
  121. 120Nakhon PathomNakhon Pathom, Thailand
    801.7×
  122. 122Hua HinPrachuap Khiri Khan, Thailand
    791.6×
  123. 122SaraburiSaraburi, Thailand
    791.6×
  124. 124Puerto MonttLos Lagos Region, Chile
    791.6×
  125. 124CuricóMaule Region, Chile
    791.6×
  126. 124AguascalientesAguascalientes, Mexico
    791.6×
  127. 127CuernavacaMorelos, Mexico
    791.6×
  128. 127León de los AldamaGuanajuato, Mexico
    791.6×
  129. 129Saphan SungBangkok, Thailand
    781.6×
  130. 130Surat ThaniSurat Thani, Thailand
    781.6×
  131. 130ColomboWestern Province, Sri Lanka
    781.6×
  132. 130San Andrés TuxtlaVeracruz, Mexico
    781.6×
  133. 133Khan Na YaoBangkok, Thailand
    781.6×
  134. 134BakuBaki, Azerbaijan
    781.6×
  135. 134San Luis de la PazGuanajuato, Mexico
    781.6×
  136. 136BrakpanGauteng, South Africa
    781.6×
  137. 137Sai MaiBangkok, Thailand
    771.5×
  138. 138BangkokBangkok, Thailand
    771.5×
  139. 138Jastrzębie ZdrójSilesia, Poland
    771.5×
  140. 140YalaYala, Thailand
    771.5×
  141. 141AcharnésAttica, Greece
    761.5×
  142. 141Ban ChangRayong, Thailand
    761.5×
  143. 141Puerto VarasLos Lagos Region, Chile
    761.5×
  144. 144Nong ChokBangkok, Thailand
    761.5×
  145. 145Wan ChaiWan Chai, Hong Kong
    761.5×
  146. 145Laem ChabangChon Buri, Thailand
    761.5×
  147. 145La SerenaCoquimbo Region, Chile
    761.5×
  148. 145Lak SiBangkok, Thailand
    761.5×
  149. 149ChiguayanteBiobio, Chile
    751.5×
  150. 150AsprópyrgosAttica, Greece
    751.5×
  151. 150TalcaMaule Region, Chile
    751.5×
  152. 150TopekaKansas, United States
    751.5×
  153. 153CoronelBiobio, Chile
    751.5×
  154. 154ThembisaGauteng, South Africa
    741.4×
  155. 154Mong KokYau Tsim Mong District, Hong Kong
    741.4×
  156. 156Bang Bo DistrictSamut Prakan, Thailand
    741.4×
  157. 156ConakryConakry, Guinea
    741.4×
  158. 158KlerksdorpNorth West, South Africa
    741.4×
  159. 158GuanajuatoGuanajuato, Mexico
    741.4×
  160. 160AricaArica y Parinacota Region, Chile
    741.4×
  161. 161ToméBiobio, Chile
    731.4×
  162. 162AthensAttica, Greece
    731.4×
  163. 162Kathmandulow-cost sensorsBagmati Province, Nepal
    731.4×
  164. 162Ciudad General EscobedoNuevo León, Mexico
    731.4×
  165. 165LazarevacCentral Serbia, Serbia
    731.4×
  166. 166CoquimboCoquimbo Region, Chile
    731.4×
  167. 166AbasoloGuanajuato, Mexico
    731.4×
  168. 166Bueng KumBangkok, Thailand
    731.4×
  169. 169LinaresMaule Region, Chile
    731.4×
  170. 170Mueang NonthaburiNonthaburi, Thailand
    721.4×
  171. 170Khlong LuangPathum Thani, Thailand
    721.4×
  172. 172Hat YaiSongkhla, Thailand
    721.4×
  173. 173Karachilow-cost sensorsSindh, Pakistan
    721.3×
  174. 174Bang KapiBangkok, Thailand
    711.3×
  175. 175MumbaiMaharashtra, India
    711.3×
  176. 175LimaLima Province, Peru
    711.3×
  177. 177TijuanaBaja California, Mexico
    711.3×
  178. 178Lat KrabangBangkok, Thailand
    701.3×
  179. 179ChisinauChișinău Municipality, Moldova
    701.3×
  180. 179PirotCentral Serbia, Serbia
    701.3×
  181. 179OsornoLos Lagos Region, Chile
    701.3×
  182. 182Phra PradaengSamut Prakan, Thailand
    701.3×
  183. 182LotaBiobio, Chile
    701.3×
  184. 184KhartoumKhartoum, Sudan
    701.3×
  185. 184RayongRayong, Thailand
    701.3×
  186. 186NarathiwatNarathiwat, Thailand
    701.3×
  187. 186ChanthaburiChanthaburi, Thailand
    701.3×
  188. 186Ban Khlong PrawetBangkok, Thailand
    701.3×
  189. 186La UniónLos Ríos Region, Chile
    701.3×
  190. 190CauquenesMaule Region, Chile
    691.3×
  191. 191ThabazimbiLimpopo, South Africa
    691.2×
  192. 191Ban Talat BuengChon Buri, Thailand
    691.2×
  193. 191EdmontonAlberta, Canada
    691.2×
  194. 194KragujevacCentral Serbia, Serbia
    691.2×
  195. 195VictoriaCentral and Western, Hong Kong
    691.2×
  196. 195AntofagastaAntofagasta, Chile
    691.2×
  197. 197PhuketPhuket, Thailand
    681.2×
  198. 198CayenneGuyane, French Guiana
    681.2×
  199. 199CopiapóAtacama, Chile
    681.2×
  200. 200VeracruzVeracruz, Mexico
    671.2×

Top 200 of 1,515 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 2, 2023, smogrank.com/history/2023-04-02 (accessed 2 Oct 2026).

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