SmogRank / History / April 1, 2023

Most polluted cities on April 1, 2023

1,501 cities ranked by their average PM2.5 over the day; the worst was N'Djamena, Chad, at 331.0 µg/m³. Each city's own local calendar day.

← N'Djamena 331.0 µg/m³ 300 µg/m³15 WHO 24-hour guideline
Every city ranked for April 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
    500+22.1×
  2. 2Mae SaiChiang Rai, Thailand
    48121.1×
  3. 3Chiang RaiChiang Rai, Thailand
    37217.4×
  4. 4ReykjavíkCapital Region, Iceland
    34816.6×
  5. 5Ban HouakhouaBokeo, Laos
    33016.0×
  6. 6PhayaoPhayao, Thailand
    28013.7×
  7. 7Chiang MaiChiang Mai, Thailand
    27013.0×
  8. 8NanNan, Thailand
    24811.5×
  9. 9LampangLampang, Thailand
    22910.3×
  10. 10LamphunLamphun, Thailand
    2109.0×
  11. 11San Mateo AtencoMéxico, Mexico
    2018.4×
  12. 12PhraePhrae, Thailand
    1957.9×
  13. 13TlaquepaqueJalisco, Mexico
    1846.9×
  14. 14BamakoBamako, Mali
    1695.4×
  15. 15LoeiLoei, Thailand
    1655.0×
  16. 16SukhothaiSukhothai, Thailand
    1614.7×
  17. 17Mae SotTak, Thailand
    1614.6×
  18. 18Tha BoNong Khai, Thailand
    1564.2×
  19. 19UttaraditUttaradit, Thailand
    1554.1×
  20. 20Dhakalow-cost sensorsDhaka Division, Bangladesh
    1523.8×
  21. 21Kamphaeng PhetKamphaeng Phet, Thailand
    1513.7×
  22. 21Udon ThaniUdon Thani, Thailand
    1513.7×
  23. 23BeijingBeijing, China
    1463.6×
  24. 24Bang Khun ThianBangkok, Thailand
    1423.5×
  25. 25PhichitPhichit, Thailand
    1403.4×
  26. 26ShenyangLiaoning, China
    1373.3×
  27. 27HyderabadTelangana, India
    1363.3×
  28. 28HanoiHanoi, Vietnam
    1353.3×
  29. 29Ciudad Benito JuárezNuevo León, Mexico
    1353.3×
  30. 30PhetchabunPhetchabun, Thailand
    1343.3×
  31. 31Nong Bua LamphuNong Bua Lamphu, Thailand
    1323.2×
  32. 32Ubon RatchathaniUbon Ratchathani, Thailand
    1303.1×
  33. 33MukdahanMukdahan, Thailand
    1293.1×
  34. 34Lahorelow-cost sensorsPunjab, Pakistan
    1273.1×
  35. 35Nakhon SawanNakhon Sawan, Thailand
    1212.9×
  36. 36GuangzhouGuangdong, China
    1192.9×
  37. 37CoyhaiqueAysén, Chile
    1192.9×
  38. 38Abujalow-cost sensorsFCT, Nigeria
    1192.8×
  39. 39TemucoAraucania, Chile
    1172.8×
  40. 40Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1172.8×
  41. 41AlexandriaAlexandria, Egypt
    1162.8×
  42. 42MexicaliBaja California, Mexico
    1142.7×
  43. 43DelhiDelhi, India
    1122.7×
  44. 44KanchanaburiKanchanaburi, Thailand
    1112.6×
  45. 45BakuBaki, Azerbaijan
    1112.6×
  46. 46TulsaOklahoma, United States
    1092.6×
  47. 47XonacatlánMéxico, Mexico
    1082.6×
  48. 48CelayaGuanajuato, Mexico
    1082.5×
  49. 49Sing BuriSing Buri, Thailand
    1072.5×
  50. 50ValjevoCentral Serbia, Serbia
    1062.5×
  51. 51AguascalientesAguascalientes, Mexico
    1062.5×
  52. 52ChaiyaphumChaiyaphum, Thailand
    1062.5×
  53. 53PakxanBolikhamsai, Laos
    1052.5×
  54. 54Sakon NakhonSakon Nakhon, Thailand
    1042.5×
  55. 55ValdiviaLos Ríos Region, Chile
    1032.4×
  56. 56NacimientoBiobio, Chile
    1022.4×
  57. 57KalasinKalasin, Thailand
    992.3×
  58. 58Ciudad NezahualcoyotlMéxico, Mexico
    982.3×
  59. 59SalorTashkent Region, Uzbekistan
    972.3×
  60. 60BaghdadBaghdad, Iraq
    972.3×
  61. 61Los ÁngelesBiobio, Chile
    962.2×
  62. 62San Salvador TizatlalliMéxico, Mexico
    962.2×
  63. 63OsornoLos Lagos Region, Chile
    962.2×
  64. 64Suphan BuriSuphan Buri, Thailand
    962.2×
  65. 64Lop BuriLopburi, Thailand
    962.2×
  66. 64TocopillaAntofagasta, Chile
    962.2×
  67. 67CuranilahueBiobio, Chile
    952.2×
  68. 68TolucaMéxico, Mexico
    952.2×
  69. 68San Francisco TlalcilalcalpanMéxico, Mexico
    952.2×
  70. 70RatchaburiRatchaburi, Thailand
    942.1×
  71. 71Si Sa KetSi Sa Ket, Thailand
    942.1×
  72. 72HualpénBiobio, Chile
    932.1×
  73. 73Bang NaBangkok, Thailand
    932.1×
  74. 74EdmontonAlberta, Canada
    922.1×
  75. 75CoronelBiobio, Chile
    922.1×
  76. 76Roi EtRoi Et, Thailand
    922.1×
  77. 76QuinteroValparaiso, Chile
    922.1×
  78. 78SalamancaGuanajuato, Mexico
    922.1×
  79. 79Novi PazarCentral Serbia, Serbia
    922.1×
  80. 79Tepeji del Río de OcampoHidalgo, Mexico
    922.1×
  81. 81YangonYangon, Myanmar
    912.1×
  82. 81San Andrés TuxtlaVeracruz, Mexico
    912.1×
  83. 83ChisinauChișinău Municipality, Moldova
    912.0×
  84. 84ShanghaiShanghai, China
    912.0×
  85. 84TalaganteSantiago Metropolitan, Chile
    912.0×
  86. 86Şabāḩ as SālimMubārak al Kabīr, Kuwait
    902.0×
  87. 86PueblaPuebla, Mexico
    902.0×
  88. 86Puerto AysénAysén, Chile
    902.0×
  89. 89Kathmandulow-cost sensorsBagmati Province, Nepal
    902.0×
  90. 90PristinaPristina, Kosovo
    892.0×
  91. 91Si Maha PhotPrachin Buri, Thailand
    892.0×
  92. 91TalcaMaule Region, Chile
    892.0×
  93. 93Nakhon RatchasimaNakhon Ratchasima, Thailand
    892.0×
  94. 94CuricóMaule Region, Chile
    881.9×
  95. 95SantiagoSantiago Metropolitan, Chile
    881.9×
  96. 96KhartoumKhartoum, Sudan
    871.9×
  97. 96ChillánÑuble, Chile
    871.9×
  98. 96JenksOklahoma, United States
    871.9×
  99. 99QuillotaValparaiso, Chile
    871.9×
  100. 100Ciudad ApodacaNuevo León, Mexico
    861.8×
  101. 100St. AlbertAlberta, Canada
    861.8×
  102. 102ConakryConakry, Guinea
    851.8×
  103. 103La OrotavaCanary Islands, Spain
    851.8×
  104. 103Viña del MarValparaiso, Chile
    851.8×
  105. 105HualquiBiobio, Chile
    851.8×
  106. 106ConcónValparaiso, Chile
    851.8×
  107. 107RancaguaO'Higgins Region, Chile
    841.8×
  108. 108MinatitlánVeracruz, Mexico
    841.8×
  109. 109IrapuatoGuanajuato, Mexico
    841.8×
  110. 109Khlong Sam WaBangkok, Thailand
    841.8×
  111. 111Mexico CityMexico City, Mexico
    841.8×
  112. 112La UniónLos Ríos Region, Chile
    831.8×
  113. 113Santa CatarinaNuevo León, Mexico
    831.7×
  114. 114ToméBiobio, Chile
    831.7×
  115. 115Ga-RankuwaNorth West, South Africa
    821.7×
  116. 116Naucalpan de JuárezMéxico, Mexico
    821.7×
  117. 117Santiago de QuerétaroQuerétaro, Mexico
    821.7×
  118. 117MonterreyNuevo León, Mexico
    821.7×
  119. 119Hua HinPrachuap Khiri Khan, Thailand
    821.7×
  120. 120Buri RamBuriram, Thailand
    811.7×
  121. 121Kampalalow-cost sensorsCentral Region, Uganda
    811.7×
  122. 121San CarlosÑuble, Chile
    811.7×
  123. 123Puente AltoSantiago Metropolitan, Chile
    811.7×
  124. 124LotaBiobio, Chile
    811.7×
  125. 124LimaLima Province, Peru
    811.7×
  126. 124TijuanaBaja California, Mexico
    811.7×
  127. 127León de los AldamaGuanajuato, Mexico
    801.6×
  128. 128SaraburiSaraburi, Thailand
    801.6×
  129. 128RengoO'Higgins Region, Chile
    801.6×
  130. 128Ciudad General EscobedoNuevo León, Mexico
    801.6×
  131. 131RabinalBaja Verapaz, Guatemala
    801.6×
  132. 131Guatemala CityGuatemala, Guatemala
    801.6×
  133. 131LinaresMaule Region, Chile
    801.6×
  134. 134CuernavacaMorelos, Mexico
    791.6×
  135. 135Puerto MonttLos Lagos Region, Chile
    791.6×
  136. 136Ban Samae DamBangkok, Thailand
    781.6×
  137. 137TalcahuanoBiobio, Chile
    781.6×
  138. 138Addis AbabaAddis Ababa, Ethiopia
    781.6×
  139. 138NišCentral Serbia, Serbia
    781.6×
  140. 138Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    781.6×
  141. 141ThessaloníkiCentral Macedonia, Greece
    781.6×
  142. 142MumbaiMaharashtra, India
    771.6×
  143. 142AricaArica y Parinacota Region, Chile
    771.6×
  144. 144Nong ChokBangkok, Thailand
    771.5×
  145. 144BelmopanCayo District, Belize
    771.5×
  146. 146San Luis de la PazGuanajuato, Mexico
    771.5×
  147. 147BangkokBangkok, Thailand
    761.5×
  148. 147Wan ChaiWan Chai, Hong Kong
    761.5×
  149. 147Laem ChabangChon Buri, Thailand
    761.5×
  150. 150Saphan SungBangkok, Thailand
    761.5×
  151. 151Nong KhaemBangkok, Thailand
    761.5×
  152. 151San Pedro de la PazBiobio, Chile
    761.5×
  153. 151Sai MaiBangkok, Thailand
    761.5×
  154. 154YalaYala, Thailand
    761.5×
  155. 155LazarevacCentral Serbia, Serbia
    761.5×
  156. 155Khan Na YaoBangkok, Thailand
    761.5×
  157. 157BrakpanGauteng, South Africa
    751.5×
  158. 157ChiguayanteBiobio, Chile
    751.5×
  159. 159Almatylow-cost sensorsAlmaty, Kazakhstan
    751.5×
  160. 159Pachuca de SotoHidalgo, Mexico
    751.5×
  161. 159La SerenaCoquimbo Region, Chile
    751.5×
  162. 162AntofagastaAntofagasta, Chile
    751.5×
  163. 163Nakhon PathomNakhon Pathom, Thailand
    751.5×
  164. 163San Miguel de AllendeGuanajuato, Mexico
    751.5×
  165. 165Khlong LuangPathum Thani, Thailand
    741.4×
  166. 165Ban ChangRayong, Thailand
    741.4×
  167. 167BucharestBucharest, Romania
    741.4×
  168. 167Lak SiBangkok, Thailand
    741.4×
  169. 169Surat ThaniSurat Thani, Thailand
    741.4×
  170. 170CauquenesMaule Region, Chile
    741.4×
  171. 171Sherwood ParkAlberta, Canada
    731.4×
  172. 172Hat YaiSongkhla, Thailand
    731.4×
  173. 172Ban Talat BuengChon Buri, Thailand
    731.4×
  174. 172Bang Bo DistrictSamut Prakan, Thailand
    731.4×
  175. 175Mong KokYau Tsim Mong District, Hong Kong
    721.4×
  176. 175Ciudad JuárezChihuahua, Mexico
    721.4×
  177. 177SasolburgFree State, South Africa
    721.4×
  178. 178Samut PrakanSamut Prakan, Thailand
    711.3×
  179. 179JohannesburgGauteng, South Africa
    711.3×
  180. 179Lat KrabangBangkok, Thailand
    711.3×
  181. 181DushanbeDushanbe, Tajikistan
    711.3×
  182. 181Bang KapiBangkok, Thailand
    711.3×
  183. 181GuanajuatoGuanajuato, Mexico
    711.3×
  184. 184Bueng KumBangkok, Thailand
    711.3×
  185. 185Puerto VarasLos Lagos Region, Chile
    701.3×
  186. 185CoquimboCoquimbo Region, Chile
    701.3×
  187. 187LublinLublin, Poland
    701.3×
  188. 187Cadereyta JiménezNuevo León, Mexico
    701.3×
  189. 189AbasoloGuanajuato, Mexico
    701.3×
  190. 190Mueang NonthaburiNonthaburi, Thailand
    691.3×
  191. 191Ban Khlong PrawetBangkok, Thailand
    691.3×
  192. 192IaşiIași County, Romania
    691.3×
  193. 192AranyaprathetSa Kaeo, Thailand
    691.3×
  194. 192ConcepciónBiobio, Chile
    691.3×
  195. 195NarathiwatNarathiwat, Thailand
    691.2×
  196. 195Santa Cruz de TenerifeCanary Islands, Spain
    691.2×
  197. 197RayongRayong, Thailand
    691.2×
  198. 198Phra PradaengSamut Prakan, Thailand
    681.2×
  199. 198ChanthaburiChanthaburi, Thailand
    681.2×
  200. 198CopiapóAtacama, Chile
    681.2×

Top 200 of 1,501 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

Use this board

SmogRank, most polluted cities, PM2.5, April 1, 2023, smogrank.com/history/2023-04-01 (accessed 2 Oct 2026).

Download top 10 (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.