SmogRank / History / April 16, 2023

Most polluted cities on April 16, 2023

1,482 cities ranked by their average PM2.5 over the day; the worst was San Luis Potosí, Mexico, at 971.0 µg/m³. Each city's own local calendar day.

← San Luis Potosí 971.0 µg/m³ 900 µg/m³15 WHO 24-hour guideline
Every city ranked for April 16, 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. 1San Luis PotosíSan Luis Potosí, Mexico
    500+64.7×
  2. 2Mae SaiChiang Rai, Thailand
    34616.5×
  3. 3Ban HouakhouaBokeo, Laos
    28714.1×
  4. 4DushanbeDushanbe, Tajikistan
    28213.8×
  5. 5Chiang RaiChiang Rai, Thailand
    25912.3×
  6. 6Dhakalow-cost sensorsDhaka Division, Bangladesh
    24611.4×
  7. 7PhayaoPhayao, Thailand
    2219.7×
  8. 8Chiang MaiChiang Mai, Thailand
    2129.1×
  9. 9LampangLampang, Thailand
    2048.6×
  10. 10NanNan, Thailand
    2008.3×
  11. 11BloemfonteinFree State, South Africa
    1947.8×
  12. 12LamphunLamphun, Thailand
    1917.5×
  13. 13Kathmandulow-cost sensorsBagmati Province, Nepal
    1897.3×
  14. 14Sing BuriSing Buri, Thailand
    1715.6×
  15. 15Chai NatChai Nat, Thailand
    1715.6×
  16. 16PhraePhrae, Thailand
    1705.5×
  17. 17SukhothaiSukhothai, Thailand
    1705.5×
  18. 18Kamphaeng PhetKamphaeng Phet, Thailand
    1695.4×
  19. 19UttaraditUttaradit, Thailand
    1675.2×
  20. 20Suphan BuriSuphan Buri, Thailand
    1675.2×
  21. 21PhichitPhichit, Thailand
    1665.2×
  22. 22DelhiDelhi, India
    1655.0×
  23. 23Nakhon SawanNakhon Sawan, Thailand
    1655.0×
  24. 24BamakoBamako, Mali
    1655.0×
  25. 25PhetchabunPhetchabun, Thailand
    1645.0×
  26. 26Lop BuriLopburi, Thailand
    1634.8×
  27. 27RatchaburiRatchaburi, Thailand
    1624.7×
  28. 28ChillánÑuble, Chile
    1614.7×
  29. 29Bang Khun ThianBangkok, Thailand
    1614.6×
  30. 30Bang NaBangkok, Thailand
    1584.4×
  31. 31Hua HinPrachuap Khiri Khan, Thailand
    1574.3×
  32. 32Nong KhaemBangkok, Thailand
    1574.3×
  33. 33Samut PrakanSamut Prakan, Thailand
    1564.2×
  34. 34Nakhon PathomNakhon Pathom, Thailand
    1564.2×
  35. 35Ban Samae DamBangkok, Thailand
    1564.2×
  36. 36Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    1544.0×
  37. 37Khlong Sam WaBangkok, Thailand
    1544.0×
  38. 38BangkokBangkok, Thailand
    1544.0×
  39. 39Bueng KumBangkok, Thailand
    1533.8×
  40. 39Lak SiBangkok, Thailand
    1533.8×
  41. 41Saphan SungBangkok, Thailand
    1523.8×
  42. 42Khan Na YaoBangkok, Thailand
    1523.8×
  43. 43Mae SotTak, Thailand
    1523.8×
  44. 44Samut SakhonSamut Sakhon, Thailand
    1523.8×
  45. 45LoeiLoei, Thailand
    1513.7×
  46. 46Bang KapiBangkok, Thailand
    1513.7×
  47. 47Sai MaiBangkok, Thailand
    1503.7×
  48. 48Phra PradaengSamut Prakan, Thailand
    1503.7×
  49. 48Lat KrabangBangkok, Thailand
    1503.7×
  50. 50Ban ChangRayong, Thailand
    1483.6×
  51. 51Nong ChokBangkok, Thailand
    1483.6×
  52. 52Mueang NonthaburiNonthaburi, Thailand
    1473.6×
  53. 53Ban Khlong PrawetBangkok, Thailand
    1463.6×
  54. 54HyderabadTelangana, India
    1463.6×
  55. 55Laem ChabangChon Buri, Thailand
    1453.6×
  56. 56RabinalBaja Verapaz, Guatemala
    1433.5×
  57. 56Guatemala CityGuatemala, Guatemala
    1433.5×
  58. 58Khlong LuangPathum Thani, Thailand
    1433.5×
  59. 59SaraburiSaraburi, Thailand
    1423.5×
  60. 59ChaiyaphumChaiyaphum, Thailand
    1423.5×
  61. 61Nakhon RatchasimaNakhon Ratchasima, Thailand
    1423.5×
  62. 61Ban Talat BuengChon Buri, Thailand
    1423.5×
  63. 63HanoiHanoi, Vietnam
    1423.5×
  64. 64Nong Bua LamphuNong Bua Lamphu, Thailand
    1403.4×
  65. 65Lahorelow-cost sensorsPunjab, Pakistan
    1393.4×
  66. 66RayongRayong, Thailand
    1353.3×
  67. 67Bang Bo DistrictSamut Prakan, Thailand
    1353.3×
  68. 68Udon ThaniUdon Thani, Thailand
    1343.3×
  69. 69CoyhaiqueAysén, Chile
    1333.2×
  70. 70Ubon RatchathaniUbon Ratchathani, Thailand
    1323.2×
  71. 71KanchanaburiKanchanaburi, Thailand
    1313.2×
  72. 72TalcahuanoBiobio, Chile
    1303.1×
  73. 73Khon KaenKhon Kaen, Thailand
    1283.1×
  74. 74ChanthaburiChanthaburi, Thailand
    1263.0×
  75. 75PhuketPhuket, Thailand
    1233.0×
  76. 76YangonYangon, Myanmar
    1202.9×
  77. 77Surat ThaniSurat Thani, Thailand
    1202.9×
  78. 77PakxanBolikhamsai, Laos
    1202.9×
  79. 77TlaquepaqueJalisco, Mexico
    1202.9×
  80. 80MexicaliBaja California, Mexico
    1192.9×
  81. 81TrangTrang, Thailand
    1182.8×
  82. 82Hat YaiSongkhla, Thailand
    1182.8×
  83. 83San CarlosÑuble, Chile
    1172.8×
  84. 84BrakpanGauteng, South Africa
    1152.7×
  85. 85Si Sa KetSi Sa Ket, Thailand
    1152.7×
  86. 85GuangzhouGuangdong, China
    1152.7×
  87. 87Roi EtRoi Et, Thailand
    1142.7×
  88. 88SatunSatun, Thailand
    1142.7×
  89. 89KalasinKalasin, Thailand
    1132.7×
  90. 90NarathiwatNarathiwat, Thailand
    1102.6×
  91. 91NacimientoBiobio, Chile
    1072.5×
  92. 92VeracruzVeracruz, Mexico
    1042.5×
  93. 93HualpénBiobio, Chile
    1032.4×
  94. 94Buri RamBuriram, Thailand
    1022.4×
  95. 94Puerto VarasLos Lagos Region, Chile
    1022.4×
  96. 96Ciudad Benito JuárezNuevo León, Mexico
    1012.4×
  97. 97Islamabadlow-cost sensorsIslamabad, Pakistan
    1002.4×
  98. 98CelayaGuanajuato, Mexico
    982.3×
  99. 99CuricóMaule Region, Chile
    972.3×
  100. 100AranyaprathetSa Kaeo, Thailand
    972.3×
  101. 101KhartoumKhartoum, Sudan
    972.3×
  102. 102RancaguaO'Higgins Region, Chile
    972.2×
  103. 102LinaresMaule Region, Chile
    972.2×
  104. 104BetongYala, Thailand
    952.2×
  105. 105HamiltonOntario, Canada
    952.2×
  106. 106HualquiBiobio, Chile
    942.2×
  107. 107Tepeji del Río de OcampoHidalgo, Mexico
    942.1×
  108. 108Sakon NakhonSakon Nakhon, Thailand
    942.1×
  109. 109XonacatlánMéxico, Mexico
    932.1×
  110. 110Novi PazarCentral Serbia, Serbia
    922.1×
  111. 111PristinaPristina, Kosovo
    922.1×
  112. 111GuadalajaraJalisco, Mexico
    922.1×
  113. 113TratTrat, Thailand
    922.1×
  114. 114ShenyangLiaoning, China
    912.1×
  115. 115Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    912.0×
  116. 116BelmopanCayo District, Belize
    912.0×
  117. 117Mong KokYau Tsim Mong District, Hong Kong
    902.0×
  118. 118Puente AltoSantiago Metropolitan, Chile
    902.0×
  119. 119La UniónLos Ríos Region, Chile
    892.0×
  120. 120SantiagoSantiago Metropolitan, Chile
    892.0×
  121. 121SasolburgFree State, South Africa
    892.0×
  122. 121San Mateo AtencoMéxico, Mexico
    892.0×
  123. 123Nakhon Si ThammaratNakhon Si Thammarat, Thailand
    881.9×
  124. 124RengoO'Higgins Region, Chile
    881.9×
  125. 124CoronelBiobio, Chile
    881.9×
  126. 126OsornoLos Lagos Region, Chile
    881.9×
  127. 127San Tung Chung HangIslands, Hong Kong
    861.9×
  128. 128Karachilow-cost sensorsSindh, Pakistan
    861.9×
  129. 129San Francisco TlalcilalcalpanMéxico, Mexico
    861.9×
  130. 130Wan ChaiWan Chai, Hong Kong
    861.8×
  131. 131TolucaMéxico, Mexico
    851.8×
  132. 132San Andrés TuxtlaVeracruz, Mexico
    851.8×
  133. 133BaghdadBaghdad, Iraq
    851.8×
  134. 134CuranilahueBiobio, Chile
    841.8×
  135. 135Ciudad NezahualcoyotlMéxico, Mexico
    841.8×
  136. 136Túxpam de Rodríguez CanoVeracruz, Mexico
    831.8×
  137. 137Kampalalow-cost sensorsCentral Region, Uganda
    831.7×
  138. 137ValjevoCentral Serbia, Serbia
    831.7×
  139. 137PueblaPuebla, Mexico
    831.7×
  140. 140JakartaJakarta, Indonesia
    821.7×
  141. 140CoatzacoalcosVeracruz, Mexico
    821.7×
  142. 142LazarevacCentral Serbia, Serbia
    821.7×
  143. 142VanderbijlparkGauteng, South Africa
    821.7×
  144. 144ZapopanJalisco, Mexico
    821.7×
  145. 145LotaBiobio, Chile
    821.7×
  146. 145Silao de la VictoriaGuanajuato, Mexico
    821.7×
  147. 147QuillotaValparaiso, Chile
    811.7×
  148. 148ConakryConakry, Guinea
    811.7×
  149. 149TalcaMaule Region, Chile
    811.7×
  150. 150Ulu BedokSingapore
    801.6×
  151. 151KasselHesse, Germany
    801.6×
  152. 152ToméBiobio, Chile
    791.6×
  153. 153SoestNorth Rhine-Westphalia, Germany
    791.6×
  154. 154BielefeldNorth Rhine-Westphalia, Germany
    791.6×
  155. 155SalamancaGuanajuato, Mexico
    791.6×
  156. 155San Pedro de la PazBiobio, Chile
    791.6×
  157. 157OsnabrückLower Saxony, Germany
    781.6×
  158. 157ConcepciónBiobio, Chile
    781.6×
  159. 159KitchenerOntario, Canada
    781.6×
  160. 160ColomboWestern Province, Sri Lanka
    771.6×
  161. 160Tsuen WanTsuen Wan, Hong Kong
    771.6×
  162. 160ChiguayanteBiobio, Chile
    771.6×
  163. 163QuinteroValparaiso, Chile
    771.5×
  164. 164Queenstown Estatelow-cost sensorsSingapore
    771.5×
  165. 165CalexicoCalifornia, United States
    771.5×
  166. 166MumbaiMaharashtra, India
    761.5×
  167. 167Kwai ChungKwai Tsing District, Hong Kong
    761.5×
  168. 168Naucalpan de JuárezMéxico, Mexico
    761.5×
  169. 169SolingenNorth Rhine-Westphalia, Germany
    751.5×
  170. 169ValdiviaLos Ríos Region, Chile
    751.5×
  171. 171KościanGreater Poland, Poland
    751.5×
  172. 172FlensburgSchleswig-Holstein, Germany
    741.4×
  173. 172CauquenesMaule Region, Chile
    741.4×
  174. 174KlerksdorpNorth West, South Africa
    741.4×
  175. 174KielSchleswig-Holstein, Germany
    741.4×
  176. 174GüstrowMecklenburg-Vorpommern, Germany
    741.4×
  177. 174Puerto MonttLos Lagos Region, Chile
    741.4×
  178. 174Greater SudburyOntario, Canada
    741.4×
  179. 179OldenburgLower Saxony, Germany
    741.4×
  180. 179BrantfordOntario, Canada
    741.4×
  181. 181MünsterNorth Rhine-Westphalia, Germany
    741.4×
  182. 181ItzehoeSchleswig-Holstein, Germany
    741.4×
  183. 181TemucoAraucania, Chile
    741.4×
  184. 184BarrieOntario, Canada
    741.4×
  185. 185KölnNorth Rhine-Westphalia, Germany
    731.4×
  186. 185Puerto AysénAysén, Chile
    731.4×
  187. 185LimaLima Province, Peru
    731.4×
  188. 188La SerenaCoquimbo Region, Chile
    731.4×
  189. 189ConcónValparaiso, Chile
    731.4×
  190. 190RintelnLower Saxony, Germany
    731.4×
  191. 190GöttingenLower Saxony, Germany
    731.4×
  192. 192FanlingNorth District, Hong Kong
    731.4×
  193. 192Viña del MarValparaiso, Chile
    731.4×
  194. 194SalorTashkent Region, Uzbekistan
    721.4×
  195. 195KrakówLesser Poland, Poland
    721.4×
  196. 195CoquimboCoquimbo Region, Chile
    721.4×
  197. 195BuffaloNew York, United States
    721.4×
  198. 198KatowiceSilesia, Poland
    721.4×
  199. 199DelmenhorstLower Saxony, Germany
    711.3×
  200. 199Bielsko-BialaSilesia, Poland
    711.3×

Top 200 of 1,482 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 16, 2023, smogrank.com/history/2023-04-16 (accessed 2 Oct 2026).

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