SmogRank / History / May 17, 2023

Most polluted cities on May 17, 2023

1,570 cities ranked by their average PM2.5 over the day; the worst was Ceglie Messapica, Italy, at 808.0 µg/m³. Each city's own local calendar day.

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

← Ceglie Messapica 808.0 µg/m³ 800 µg/m³15 WHO 24-hour guideline
Every city ranked for May 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. 1Ceglie MessapicaApulia, Italy
    500+53.9×
  2. 2ReginaSaskatchewan, Canada
    23510.7×
  3. 3Swift CurrentSaskatchewan, Canada
    22610.1×
  4. 4DushanbeDushanbe, Tajikistan
    2249.9×
  5. 5Grande PrairieAlberta, Canada
    2219.7×
  6. 6SaskatoonSaskatchewan, Canada
    2139.2×
  7. 7Prince AlbertSaskatchewan, Canada
    2098.9×
  8. 8CalgaryAlberta, Canada
    2068.7×
  9. 9AirdrieAlberta, Canada
    2058.7×
  10. 10Red DeerAlberta, Canada
    2058.6×
  11. 11BloemfonteinFree State, South Africa
    1957.9×
  12. 12KamloopsBritish Columbia, Canada
    1826.6×
  13. 13EdmontonAlberta, Canada
    1766.1×
  14. 14Fort St. JohnBritish Columbia, Canada
    1756.0×
  15. 15DelhiDelhi, India
    1735.8×
  16. 16Lahorelow-cost sensorsPunjab, Pakistan
    1715.6×
  17. 16OsornoLos Lagos Region, Chile
    1715.6×
  18. 18St. AlbertAlberta, Canada
    1665.2×
  19. 19Dhakalow-cost sensorsDhaka Division, Bangladesh
    1665.2×
  20. 20Prince GeorgeBritish Columbia, Canada
    1634.8×
  21. 21LethbridgeAlberta, Canada
    1624.8×
  22. 22Puerto VarasLos Lagos Region, Chile
    1604.6×
  23. 23Ga-RankuwaNorth West, South Africa
    1564.2×
  24. 24TlaquepaqueJalisco, Mexico
    1544.0×
  25. 25San CarlosÑuble, Chile
    1483.6×
  26. 26JakartaJakarta, Indonesia
    1463.6×
  27. 27LinaresMaule Region, Chile
    1443.5×
  28. 28CranbrookBritish Columbia, Canada
    1423.5×
  29. 29Sherwood ParkAlberta, Canada
    1393.4×
  30. 30Kathmandulow-cost sensorsBagmati Province, Nepal
    1373.4×
  31. 31VernonBritish Columbia, Canada
    1343.3×
  32. 32Ubon RatchathaniUbon Ratchathani, Thailand
    1323.2×
  33. 33Medicine HatAlberta, Canada
    1293.1×
  34. 34HanoiHanoi, Vietnam
    1283.1×
  35. 35AberdeenSouth Dakota, United States
    1273.1×
  36. 36BrandonManitoba, Canada
    1263.0×
  37. 37BaghdadBaghdad, Iraq
    1263.0×
  38. 38MukdahanMukdahan, Thailand
    1253.0×
  39. 39TalcaMaule Region, Chile
    1222.9×
  40. 40ThembisaGauteng, South Africa
    1212.9×
  41. 41Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1172.8×
  42. 42La UniónLos Ríos Region, Chile
    1162.8×
  43. 43Bang Khun ThianBangkok, Thailand
    1152.7×
  44. 44West FargoNorth Dakota, United States
    1142.7×
  45. 45Si Maha PhotPrachin Buri, Thailand
    1142.7×
  46. 46Nakhon RatchasimaNakhon Ratchasima, Thailand
    1122.7×
  47. 47ValdiviaLos Ríos Region, Chile
    1112.6×
  48. 47NacimientoBiobio, Chile
    1112.6×
  49. 49KelownaBritish Columbia, Canada
    1112.6×
  50. 50RabinalBaja Verapaz, Guatemala
    1092.6×
  51. 50Guatemala CityGuatemala, Guatemala
    1092.6×
  52. 52Roi EtRoi Et, Thailand
    1082.6×
  53. 53Kampalalow-cost sensorsCentral Region, Uganda
    1082.6×
  54. 54KigaliKigali, Rwanda
    1082.6×
  55. 55CuranilahueBiobio, Chile
    1072.5×
  56. 56Bang NaBangkok, Thailand
    1062.5×
  57. 57Islamabadlow-cost sensorsIslamabad, Pakistan
    1052.5×
  58. 57CauquenesMaule Region, Chile
    1052.5×
  59. 59Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1052.5×
  60. 60Khan Na YaoBangkok, Thailand
    1042.4×
  61. 61ChillánÑuble, Chile
    1032.4×
  62. 61Khlong Sam WaBangkok, Thailand
    1032.4×
  63. 63Ban Samae DamBangkok, Thailand
    1002.4×
  64. 64Nong KhaemBangkok, Thailand
    992.3×
  65. 65HualquiBiobio, Chile
    992.3×
  66. 66Suphan BuriSuphan Buri, Thailand
    992.3×
  67. 66Rapid CitySouth Dakota, United States
    992.3×
  68. 68RancaguaO'Higgins Region, Chile
    992.3×
  69. 69Si Sa KetSi Sa Ket, Thailand
    992.3×
  70. 70Lop BuriLopburi, Thailand
    982.3×
  71. 71Buri RamBuriram, Thailand
    982.3×
  72. 72CelayaGuanajuato, Mexico
    962.2×
  73. 73SaraburiSaraburi, Thailand
    962.2×
  74. 73Puerto MonttLos Lagos Region, Chile
    962.2×
  75. 75Saphan SungBangkok, Thailand
    952.2×
  76. 76Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    952.2×
  77. 77AntananarivoAnalamanga, Madagascar
    932.1×
  78. 77NanNan, Thailand
    932.1×
  79. 79Sing BuriSing Buri, Thailand
    932.1×
  80. 80Lak SiBangkok, Thailand
    922.1×
  81. 81Khlong LuangPathum Thani, Thailand
    922.1×
  82. 81Bueng KumBangkok, Thailand
    922.1×
  83. 83Mae SaiChiang Rai, Thailand
    922.1×
  84. 84HyderabadTelangana, India
    922.1×
  85. 85CoronelBiobio, Chile
    922.1×
  86. 85Lat KrabangBangkok, Thailand
    922.1×
  87. 87ToméBiobio, Chile
    912.1×
  88. 88RayongRayong, Thailand
    912.0×
  89. 89DurbanKwaZulu-Natal, South Africa
    912.0×
  90. 89Bang KapiBangkok, Thailand
    912.0×
  91. 91BillingsMontana, United States
    912.0×
  92. 92Addis AbabaAddis Ababa, Ethiopia
    902.0×
  93. 92JohannesburgGauteng, South Africa
    902.0×
  94. 94BangkokBangkok, Thailand
    902.0×
  95. 94ChaiyaphumChaiyaphum, Thailand
    902.0×
  96. 96HelenaMontana, United States
    902.0×
  97. 97BritsNorth West, South Africa
    902.0×
  98. 97PhetchabunPhetchabun, Thailand
    902.0×
  99. 99RatchaburiRatchaburi, Thailand
    902.0×
  100. 100ChennaiTamil Nadu, India
    892.0×
  101. 100PentictonBritish Columbia, Canada
    892.0×
  102. 102KolkataWest Bengal, India
    892.0×
  103. 103Sakon NakhonSakon Nakhon, Thailand
    892.0×
  104. 103RengoO'Higgins Region, Chile
    892.0×
  105. 105Phra PradaengSamut Prakan, Thailand
    881.9×
  106. 105Nakhon PathomNakhon Pathom, Thailand
    881.9×
  107. 107BogotáBogota D.C., Colombia
    881.9×
  108. 108León de los AldamaGuanajuato, Mexico
    881.9×
  109. 109Sai MaiBangkok, Thailand
    881.9×
  110. 110Samut PrakanSamut Prakan, Thailand
    871.9×
  111. 111Udon ThaniUdon Thani, Thailand
    871.9×
  112. 111Nong ChokBangkok, Thailand
    871.9×
  113. 113Tha BoNong Khai, Thailand
    871.9×
  114. 113CuricóMaule Region, Chile
    871.9×
  115. 115Bang Bo DistrictSamut Prakan, Thailand
    861.9×
  116. 116AranyaprathetSa Kaeo, Thailand
    861.9×
  117. 116Laem ChabangChon Buri, Thailand
    861.9×
  118. 116TalcahuanoBiobio, Chile
    861.9×
  119. 119Mueang NonthaburiNonthaburi, Thailand
    861.8×
  120. 119SantiagoSantiago Metropolitan, Chile
    861.8×
  121. 121Ban ChangRayong, Thailand
    851.8×
  122. 122BorCentral Serbia, Serbia
    851.8×
  123. 123PristinaPristina, Kosovo
    851.8×
  124. 123Samut SakhonSamut Sakhon, Thailand
    851.8×
  125. 125UttaraditUttaradit, Thailand
    841.8×
  126. 126Ban Khlong PrawetBangkok, Thailand
    841.8×
  127. 126CoyhaiqueAysén, Chile
    841.8×
  128. 128Los ÁngelesBiobio, Chile
    841.8×
  129. 129BozemanMontana, United States
    831.8×
  130. 130PhraePhrae, Thailand
    831.8×
  131. 130Ban Talat BuengChon Buri, Thailand
    831.8×
  132. 132BeijingBeijing, China
    831.7×
  133. 133TalaganteSantiago Metropolitan, Chile
    821.7×
  134. 133Puente AltoSantiago Metropolitan, Chile
    821.7×
  135. 135Chai NatChai Nat, Thailand
    821.7×
  136. 136MiddelburgMpumalanga, South Africa
    821.7×
  137. 137SalamancaGuanajuato, Mexico
    811.7×
  138. 138Naucalpan de JuárezMéxico, Mexico
    811.7×
  139. 139Puerto AysénAysén, Chile
    811.7×
  140. 140SheridanWyoming, United States
    801.7×
  141. 141LoeiLoei, Thailand
    801.6×
  142. 142Alto HospicioTarapacá, Chile
    791.6×
  143. 143SalorTashkent Region, Uzbekistan
    791.6×
  144. 143PakxanBolikhamsai, Laos
    791.6×
  145. 145Ban HouakhouaBokeo, Laos
    791.6×
  146. 146TemucoAraucania, Chile
    781.6×
  147. 147Nakhon SawanNakhon Sawan, Thailand
    781.6×
  148. 148AntofagastaAntofagasta, Chile
    771.5×
  149. 149Mae SotTak, Thailand
    771.5×
  150. 149Silao de la VictoriaGuanajuato, Mexico
    771.5×
  151. 149Great FallsMontana, United States
    771.5×
  152. 152Kamphaeng PhetKamphaeng Phet, Thailand
    771.5×
  153. 153GuangzhouGuangdong, China
    771.5×
  154. 154QuinteroValparaiso, Chile
    761.5×
  155. 155PhayaoPhayao, Thailand
    761.5×
  156. 155CoquimboCoquimbo Region, Chile
    761.5×
  157. 157Chiang RaiChiang Rai, Thailand
    761.5×
  158. 158Mexico CityMexico City, Mexico
    751.5×
  159. 159LampangLampang, Thailand
    741.4×
  160. 160LamphunLamphun, Thailand
    741.4×
  161. 160AricaArica y Parinacota Region, Chile
    741.4×
  162. 162Hacienda Santa FeJalisco, Mexico
    741.4×
  163. 163TocopillaAntofagasta, Chile
    741.4×
  164. 164VereenigingGauteng, South Africa
    731.4×
  165. 165PhichitPhichit, Thailand
    731.4×
  166. 165HuelvaAndalusia, Spain
    731.4×
  167. 165Viña del MarValparaiso, Chile
    731.4×
  168. 168QuillotaValparaiso, Chile
    721.4×
  169. 168LotaBiobio, Chile
    721.4×
  170. 170PirotCentral Serbia, Serbia
    721.4×
  171. 170GuanajuatoGuanajuato, Mexico
    721.4×
  172. 172SukhothaiSukhothai, Thailand
    721.3×
  173. 172Chiang MaiChiang Mai, Thailand
    721.3×
  174. 174ConcepciónBiobio, Chile
    711.3×
  175. 174San Pedro de la PazBiobio, Chile
    711.3×
  176. 176ConcónValparaiso, Chile
    711.3×
  177. 177PesaroThe Marches, Italy
    701.3×
  178. 177ChiguayanteBiobio, Chile
    701.3×
  179. 179ĆuprijaCentral Serbia, Serbia
    701.3×
  180. 180La SerenaCoquimbo Region, Chile
    691.3×
  181. 181YalaYala, Thailand
    691.3×
  182. 182CalamaAntofagasta, Chile
    691.2×
  183. 182AbasoloGuanajuato, Mexico
    691.2×
  184. 184KladnoCentral Bohemia, Czechia
    671.2×
  185. 184ParadiseCalifornia, United States
    671.2×
  186. 186AstanaAstana, Kazakhstan
    671.2×
  187. 187ButteMontana, United States
    671.2×
  188. 188BetongYala, Thailand
    661.2×
  189. 188CopiapóAtacama, Chile
    661.2×
  190. 188San Miguel de AllendeGuanajuato, Mexico
    661.2×
  191. 191KanchanaburiKanchanaburi, Thailand
    661.1×
  192. 191Bishkeklow-cost sensorsBishkek, Kyrgyzstan
    661.1×
  193. 191Ang Mo Kio New TownSingapore
    661.1×
  194. 194Haskovolow-cost sensorsHaskovo, Bulgaria
    661.1×
  195. 194ColomboWestern Province, Sri Lanka
    661.1×
  196. 194IrapuatoGuanajuato, Mexico
    661.1×
  197. 197FontanaCalifornia, United States
    661.1×
  198. 198KlerksdorpNorth West, South Africa
    651.1×
  199. 199YangonYangon, Myanmar
    651.1×
  200. 200PylaíaCentral Macedonia, Greece
    651.1×

Top 200 of 1,570 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, May 17, 2023, smogrank.com/history/2023-05-17 (accessed 2 Oct 2026).

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