SmogRank / History / April 17, 2023

Most polluted cities on April 17, 2023

1,454 cities ranked by their average PM2.5 over the day; the worst was San Luis Potosí, Mexico, at 858.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during April 17, 2023. All episodes.

← San Luis Potosí 858.0 µg/m³ 800 µg/m³15 WHO 24-hour guideline
Every city ranked for April 17, 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+57.2×
  2. 2Piedras NegrasCoahuila, Mexico
    500+23.6×
  3. 3Mae SaiChiang Rai, Thailand
    29114.4×
  4. 4Ban HouakhouaBokeo, Laos
    24011.0×
  5. 5Chiang RaiChiang Rai, Thailand
    23810.9×
  6. 6DushanbeDushanbe, Tajikistan
    22510.0×
  7. 7PhayaoPhayao, Thailand
    1887.2×
  8. 8BloemfonteinFree State, South Africa
    1836.7×
  9. 9Kathmandulow-cost sensorsBagmati Province, Nepal
    1836.7×
  10. 10NanNan, Thailand
    1806.4×
  11. 11LampangLampang, Thailand
    1806.4×
  12. 12Dhakalow-cost sensorsDhaka Division, Bangladesh
    1766.1×
  13. 13Chiang MaiChiang Mai, Thailand
    1766.1×
  14. 14Chai NatChai Nat, Thailand
    1766.1×
  15. 15UttaraditUttaradit, Thailand
    1745.9×
  16. 16PhraePhrae, Thailand
    1715.6×
  17. 17Sing BuriSing Buri, Thailand
    1705.5×
  18. 18Kamphaeng PhetKamphaeng Phet, Thailand
    1695.5×
  19. 19BeijingBeijing, China
    1695.4×
  20. 20HyderabadTelangana, India
    1695.4×
  21. 21Nakhon SawanNakhon Sawan, Thailand
    1685.3×
  22. 22SukhothaiSukhothai, Thailand
    1675.3×
  23. 23Suphan BuriSuphan Buri, Thailand
    1675.2×
  24. 24PhichitPhichit, Thailand
    1665.1×
  25. 25PhetchabunPhetchabun, Thailand
    1604.6×
  26. 26LamphunLamphun, Thailand
    1594.5×
  27. 27DelhiDelhi, India
    1584.3×
  28. 28BrakpanGauteng, South Africa
    1574.2×
  29. 29BamakoBamako, Mali
    1564.1×
  30. 30RatchaburiRatchaburi, Thailand
    1564.1×
  31. 31Lop BuriLopburi, Thailand
    1544.0×
  32. 32Bang Khun ThianBangkok, Thailand
    1533.9×
  33. 33Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    1523.8×
  34. 34Bang NaBangkok, Thailand
    1523.8×
  35. 35Ubon RatchathaniUbon Ratchathani, Thailand
    1513.7×
  36. 36Nong KhaemBangkok, Thailand
    1493.7×
  37. 37HanoiHanoi, Vietnam
    1493.7×
  38. 38Khlong Sam WaBangkok, Thailand
    1483.6×
  39. 39Samut PrakanSamut Prakan, Thailand
    1473.6×
  40. 40Khan Na YaoBangkok, Thailand
    1453.6×
  41. 41LoeiLoei, Thailand
    1443.5×
  42. 41ChaiyaphumChaiyaphum, Thailand
    1443.5×
  43. 43TlaquepaqueJalisco, Mexico
    1443.5×
  44. 44Nakhon PathomNakhon Pathom, Thailand
    1433.5×
  45. 45Si Maha PhotPrachin Buri, Thailand
    1423.5×
  46. 46Bueng KumBangkok, Thailand
    1423.5×
  47. 47Ban ChangRayong, Thailand
    1413.5×
  48. 48Ban Samae DamBangkok, Thailand
    1403.4×
  49. 49SaraburiSaraburi, Thailand
    1403.4×
  50. 50Lat KrabangBangkok, Thailand
    1383.4×
  51. 51BangkokBangkok, Thailand
    1373.3×
  52. 52Hua HinPrachuap Khiri Khan, Thailand
    1363.3×
  53. 52Lak SiBangkok, Thailand
    1363.3×
  54. 54Saphan SungBangkok, Thailand
    1363.3×
  55. 55Nong ChokBangkok, Thailand
    1343.2×
  56. 56Samut SakhonSamut Sakhon, Thailand
    1333.2×
  57. 57Laem ChabangChon Buri, Thailand
    1323.2×
  58. 58Mae SotTak, Thailand
    1313.2×
  59. 59Khlong LuangPathum Thani, Thailand
    1313.2×
  60. 60Sai MaiBangkok, Thailand
    1303.2×
  61. 61AshgabatAshgabat, Turkmenistan
    1293.1×
  62. 61Nakhon RatchasimaNakhon Ratchasima, Thailand
    1293.1×
  63. 61MukdahanMukdahan, Thailand
    1293.1×
  64. 64Novi PazarCentral Serbia, Serbia
    1273.1×
  65. 65RayongRayong, Thailand
    1273.1×
  66. 66Phra PradaengSamut Prakan, Thailand
    1263.0×
  67. 67Bang KapiBangkok, Thailand
    1263.0×
  68. 68Ban Khlong PrawetBangkok, Thailand
    1263.0×
  69. 68SalamancaCastille and León, Spain
    1263.0×
  70. 70Mueang NonthaburiNonthaburi, Thailand
    1253.0×
  71. 71Islamabadlow-cost sensorsIslamabad, Pakistan
    1233.0×
  72. 72Ban Talat BuengChon Buri, Thailand
    1233.0×
  73. 73Nong Bua LamphuNong Bua Lamphu, Thailand
    1192.8×
  74. 73Bang Bo DistrictSamut Prakan, Thailand
    1192.8×
  75. 75KanchanaburiKanchanaburi, Thailand
    1172.8×
  76. 76Si Sa KetSi Sa Ket, Thailand
    1152.7×
  77. 77Ga-RankuwaNorth West, South Africa
    1142.7×
  78. 78ShenyangLiaoning, China
    1142.7×
  79. 79Udon ThaniUdon Thani, Thailand
    1132.7×
  80. 80MexicaliBaja California, Mexico
    1122.7×
  81. 81YangonYangon, Myanmar
    1102.6×
  82. 82GuangzhouGuangdong, China
    1102.6×
  83. 83PhuketPhuket, Thailand
    1102.6×
  84. 84KalasinKalasin, Thailand
    1092.6×
  85. 85SatunSatun, Thailand
    1082.6×
  86. 86Surat ThaniSurat Thani, Thailand
    1082.6×
  87. 87NarathiwatNarathiwat, Thailand
    1062.5×
  88. 88BaghdadBaghdad, Iraq
    1042.5×
  89. 88ZapopanJalisco, Mexico
    1042.5×
  90. 90ChanthaburiChanthaburi, Thailand
    1042.4×
  91. 91Roi EtRoi Et, Thailand
    1032.4×
  92. 92Khon KaenKhon Kaen, Thailand
    1022.4×
  93. 93Hat YaiSongkhla, Thailand
    1022.4×
  94. 94AranyaprathetSa Kaeo, Thailand
    1002.4×
  95. 95CoronelBiobio, Chile
    992.3×
  96. 96Sakon NakhonSakon Nakhon, Thailand
    972.3×
  97. 97Jastrzębie ZdrójSilesia, Poland
    962.2×
  98. 98Kampalalow-cost sensorsCentral Region, Uganda
    962.2×
  99. 99KortrijkFlanders, Belgium
    942.2×
  100. 100ValjevoCentral Serbia, Serbia
    942.1×
  101. 101GuadalajaraJalisco, Mexico
    912.0×
  102. 102TrangTrang, Thailand
    912.0×
  103. 103PakxanBolikhamsai, Laos
    892.0×
  104. 104EvergemFlanders, Belgium
    892.0×
  105. 105IzegemFlanders, Belgium
    881.9×
  106. 105NacimientoBiobio, Chile
    881.9×
  107. 107MenenFlanders, Belgium
    881.9×
  108. 107CelayaGuanajuato, Mexico
    881.9×
  109. 109RoubaixHauts-de-France, France
    871.9×
  110. 109HualpénBiobio, Chile
    871.9×
  111. 111Buri RamBuriram, Thailand
    871.9×
  112. 111Frýdek-MístekMoravian-Silesian Region, Czechia
    871.9×
  113. 113Wan ChaiWan Chai, Hong Kong
    871.9×
  114. 113Mong KokYau Tsim Mong District, Hong Kong
    871.9×
  115. 115HavířovMoravian-Silesian Region, Czechia
    871.9×
  116. 116RabinalBaja Verapaz, Guatemala
    861.9×
  117. 117TournaiWallonia, Belgium
    861.9×
  118. 117LimaLima Province, Peru
    861.9×
  119. 119RoeselareFlanders, Belgium
    851.8×
  120. 120KrefeldNorth Rhine-Westphalia, Germany
    851.8×
  121. 121MonterreyNuevo León, Mexico
    841.8×
  122. 122ConakryConakry, Guinea
    841.8×
  123. 122Guatemala CityGuatemala, Guatemala
    841.8×
  124. 124AndenneWallonia, Belgium
    841.8×
  125. 125BetongYala, Thailand
    831.8×
  126. 126MaldegemFlanders, Belgium
    831.7×
  127. 126QuillotaValparaiso, Chile
    831.7×
  128. 128Český TěšínMoravian-Silesian Region, Czechia
    821.7×
  129. 129DuisburgNorth Rhine-Westphalia, Germany
    821.7×
  130. 130MumbaiMaharashtra, India
    821.7×
  131. 130GentFlanders, Belgium
    821.7×
  132. 132BelmopanCayo District, Belize
    821.7×
  133. 133LilleHauts-de-France, France
    811.7×
  134. 133RacibórzSilesia, Poland
    811.7×
  135. 135KhartoumKhartoum, Sudan
    811.7×
  136. 136MonsWallonia, Belgium
    811.7×
  137. 136LiègeWallonia, Belgium
    811.7×
  138. 138BeverenFlanders, Belgium
    811.7×
  139. 139Tin Shui WaiYuen Long, Hong Kong
    801.6×
  140. 139AachenNorth Rhine-Westphalia, Germany
    801.6×
  141. 141TratTrat, Thailand
    801.6×
  142. 142ColomboWestern Province, Sri Lanka
    791.6×
  143. 142AarschotFlanders, Belgium
    791.6×
  144. 144PinetownKwaZulu-Natal, South Africa
    791.6×
  145. 145BorkenNorth Rhine-Westphalia, Germany
    791.6×
  146. 146OstravaMoravian-Silesian Region, Czechia
    791.6×
  147. 147StilfonteinNorth West, South Africa
    781.6×
  148. 147MokopaneLimpopo, South Africa
    781.6×
  149. 149PristinaPristina, Kosovo
    781.6×
  150. 150CharleroiWallonia, Belgium
    781.6×
  151. 150ValenciennesHauts-de-France, France
    781.6×
  152. 152Şabāḩ as SālimMubārak al Kabīr, Kuwait
    781.6×
  153. 152DüsseldorfNorth Rhine-Westphalia, Germany
    781.6×
  154. 154BergheimNorth Rhine-Westphalia, Germany
    771.5×
  155. 154ŁaskŁódź Voivodeship, Poland
    771.5×
  156. 154TalcahuanoBiobio, Chile
    771.5×
  157. 157Kwai ChungKwai Tsing District, Hong Kong
    771.5×
  158. 157ZwijndrechtFlanders, Belgium
    771.5×
  159. 157AntwerpFlanders, Belgium
    771.5×
  160. 160KlerksdorpNorth West, South Africa
    771.5×
  161. 160LochristiFlanders, Belgium
    771.5×
  162. 160EupenWallonia, Belgium
    771.5×
  163. 163Nakhon Si ThammaratNakhon Si Thammarat, Thailand
    771.5×
  164. 163Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    771.5×
  165. 163Czechowice-DziedziceSilesia, Poland
    771.5×
  166. 166SolingenNorth Rhine-Westphalia, Germany
    761.5×
  167. 167HelsinkiUusimaa, Finland
    761.5×
  168. 167JülichNorth Rhine-Westphalia, Germany
    761.5×
  169. 169MolFlanders, Belgium
    761.5×
  170. 169BohumínMoravian-Silesian Region, Czechia
    761.5×
  171. 171KapellenFlanders, Belgium
    761.5×
  172. 171OberhausenNorth Rhine-Westphalia, Germany
    761.5×
  173. 173JüchenNorth Rhine-Westphalia, Germany
    751.5×
  174. 174Tsuen WanTsuen Wan, Hong Kong
    751.5×
  175. 174OldenburgLower Saxony, Germany
    751.5×
  176. 174Valašské MeziříčíZlín, Czechia
    751.5×
  177. 177Bielsko-BialaSilesia, Poland
    751.5×
  178. 178San Tung Chung HangIslands, Hong Kong
    741.4×
  179. 178QuinteroValparaiso, Chile
    741.4×
  180. 180RatingenNorth Rhine-Westphalia, Germany
    741.4×
  181. 181KölnNorth Rhine-Westphalia, Germany
    741.4×
  182. 181DieppeNormandy, France
    741.4×
  183. 183MönchengladbachNorth Rhine-Westphalia, Germany
    731.4×
  184. 183KielSchleswig-Holstein, Germany
    731.4×
  185. 183CoquimboCoquimbo Region, Chile
    731.4×
  186. 186TocopillaAntofagasta, Chile
    731.4×
  187. 186GarcíaNuevo León, Mexico
    731.4×
  188. 188StabroekFlanders, Belgium
    731.4×
  189. 189HillegomSouth Holland, The Netherlands
    731.4×
  190. 189EindhovenNorth Brabant, The Netherlands
    731.4×
  191. 189HamburgHamburg, Germany
    731.4×
  192. 192VenrayLimburg, The Netherlands
    731.4×
  193. 192RidderkerkSouth Holland, The Netherlands
    731.4×
  194. 192BrusselsBrussels Capital, Belgium
    731.4×
  195. 192WuppertalNorth Rhine-Westphalia, Germany
    731.4×
  196. 192ConcónValparaiso, Chile
    731.4×
  197. 192SaltilloCoahuila, Mexico
    731.4×
  198. 198RotterdamSouth Holland, The Netherlands
    721.4×
  199. 198MaassluisSouth Holland, The Netherlands
    721.4×
  200. 198KoksijdeFlanders, Belgium
    721.4×

Top 200 of 1,454 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 17, 2023, smogrank.com/history/2023-04-17 (accessed 2 Oct 2026).

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