SmogRank / History / May 22, 2023

Most polluted cities on May 22, 2023

1,544 cities ranked by their average PM2.5 over the day; the worst was Fort McMurray, Canada, at 140.5 µg/m³. Each city's own local calendar day.

Bad-air episodes during May 22, 2023. All episodes.

← Fort McMurray 140.5 µg/m³ 100 µg/m³15 WHO 24-hour guideline
Every city ranked for May 22, 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. 1Fort McMurrayAlberta, Canada
    2169.4×
  2. 2Lahorelow-cost sensorsPunjab, Pakistan
    2008.3×
  3. 3EdmontonAlberta, Canada
    1988.1×
  4. 4Red DeerAlberta, Canada
    1907.4×
  5. 5OsornoLos Lagos Region, Chile
    1816.6×
  6. 6CoyhaiqueAysén, Chile
    1745.8×
  7. 7St. AlbertAlberta, Canada
    1715.6×
  8. 8Puerto AysénAysén, Chile
    1675.2×
  9. 9Grande PrairieAlberta, Canada
    1665.1×
  10. 10HyderabadTelangana, India
    1634.8×
  11. 11Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1604.6×
  12. 12DelhiDelhi, India
    1604.6×
  13. 13BloemfonteinFree State, South Africa
    1574.3×
  14. 14JakartaJakarta, Indonesia
    1554.0×
  15. 15Dhakalow-cost sensorsDhaka Division, Bangladesh
    1544.0×
  16. 16Kampalalow-cost sensorsCentral Region, Uganda
    1533.9×
  17. 17Puerto VarasLos Lagos Region, Chile
    1533.9×
  18. 18HanoiHanoi, Vietnam
    1533.9×
  19. 19Sherwood ParkAlberta, Canada
    1463.6×
  20. 20AirdrieAlberta, Canada
    1443.5×
  21. 21CalgaryAlberta, Canada
    1443.5×
  22. 22Kathmandulow-cost sensorsBagmati Province, Nepal
    1373.3×
  23. 23CuranilahueBiobio, Chile
    1343.3×
  24. 24NanNan, Thailand
    1263.0×
  25. 25BaghdadBaghdad, Iraq
    1263.0×
  26. 26GilletteWyoming, United States
    1243.0×
  27. 27UttaraditUttaradit, Thailand
    1222.9×
  28. 28AntananarivoAnalamanga, Madagascar
    1212.9×
  29. 29Islamabadlow-cost sensorsIslamabad, Pakistan
    1192.9×
  30. 29Ban HouakhouaBokeo, Laos
    1192.9×
  31. 31ShenyangLiaoning, China
    1192.8×
  32. 32PhayaoPhayao, Thailand
    1182.8×
  33. 33Mae SaiChiang Rai, Thailand
    1162.8×
  34. 34TalaganteSantiago Metropolitan, Chile
    1152.8×
  35. 35PakxanBolikhamsai, Laos
    1152.7×
  36. 36KigaliKigali, Rwanda
    1132.7×
  37. 37SantiagoSantiago Metropolitan, Chile
    1132.7×
  38. 38MukdahanMukdahan, Thailand
    1122.7×
  39. 38Swift CurrentSaskatchewan, Canada
    1122.7×
  40. 40Puente AltoSantiago Metropolitan, Chile
    1102.6×
  41. 41HualquiBiobio, Chile
    1092.6×
  42. 42SaskatoonSaskatchewan, Canada
    1082.6×
  43. 43PhraePhrae, Thailand
    1082.5×
  44. 43Prince AlbertSaskatchewan, Canada
    1082.5×
  45. 45AndenneWallonia, Belgium
    1072.5×
  46. 45KoblenzRheinland-Pfalz, Germany
    1072.5×
  47. 47Ubon RatchathaniUbon Ratchathani, Thailand
    1062.5×
  48. 48CelayaGuanajuato, Mexico
    1062.5×
  49. 49Puerto MonttLos Lagos Region, Chile
    1052.5×
  50. 50ThembisaGauteng, South Africa
    1052.5×
  51. 50Udon ThaniUdon Thani, Thailand
    1052.5×
  52. 52Saphan SungBangkok, Thailand
    1052.5×
  53. 53La UniónLos Ríos Region, Chile
    1042.4×
  54. 54PhetchabunPhetchabun, Thailand
    1032.4×
  55. 55Chiang RaiChiang Rai, Thailand
    1012.4×
  56. 56LoeiLoei, Thailand
    1012.4×
  57. 57Ken CarylColorado, United States
    1002.4×
  58. 58Sakon NakhonSakon Nakhon, Thailand
    1002.3×
  59. 59PhichitPhichit, Thailand
    992.3×
  60. 60KolkataWest Bengal, India
    992.3×
  61. 61TemucoAraucania, Chile
    982.3×
  62. 62Şabāḩ as SālimMubārak al Kabīr, Kuwait
    972.3×
  63. 63Khlong Sam WaBangkok, Thailand
    972.2×
  64. 64Si Maha PhotPrachin Buri, Thailand
    962.2×
  65. 64Fort St. JohnBritish Columbia, Canada
    962.2×
  66. 66Khon KaenKhon Kaen, Thailand
    962.2×
  67. 67Roi EtRoi Et, Thailand
    952.2×
  68. 68VereenigingGauteng, South Africa
    952.2×
  69. 69AarschotFlanders, Belgium
    952.2×
  70. 70Chiang MaiChiang Mai, Thailand
    942.1×
  71. 71ChaiyaphumChaiyaphum, Thailand
    942.1×
  72. 72Si Sa KetSi Sa Ket, Thailand
    932.1×
  73. 73SukhothaiSukhothai, Thailand
    932.1×
  74. 74GrimbergenFlanders, Belgium
    932.1×
  75. 75LamphunLamphun, Thailand
    932.1×
  76. 75LampangLampang, Thailand
    932.1×
  77. 77SheridanWyoming, United States
    932.1×
  78. 78LiègeWallonia, Belgium
    922.1×
  79. 78DenverColorado, United States
    922.1×
  80. 80RancaguaO'Higgins Region, Chile
    922.1×
  81. 81DushanbeDushanbe, Tajikistan
    922.1×
  82. 82HernandoMississippi, United States
    922.1×
  83. 82Rapid CitySouth Dakota, United States
    922.1×
  84. 84BritsNorth West, South Africa
    912.0×
  85. 84CoronelBiobio, Chile
    912.0×
  86. 86QuillotaValparaiso, Chile
    912.0×
  87. 86NacimientoBiobio, Chile
    912.0×
  88. 88Khan Na YaoBangkok, Thailand
    912.0×
  89. 89Bang NaBangkok, Thailand
    902.0×
  90. 90BergheimNorth Rhine-Westphalia, Germany
    902.0×
  91. 90BendorfRheinland-Pfalz, Germany
    902.0×
  92. 92CharleroiWallonia, Belgium
    902.0×
  93. 93RayongRayong, Thailand
    892.0×
  94. 93EupenWallonia, Belgium
    892.0×
  95. 95BonnNorth Rhine-Westphalia, Germany
    892.0×
  96. 96Ga-RankuwaNorth West, South Africa
    892.0×
  97. 97JohannesburgGauteng, South Africa
    892.0×
  98. 97Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    892.0×
  99. 99SasolburgFree State, South Africa
    892.0×
  100. 99Nong KhaemBangkok, Thailand
    892.0×
  101. 99Lop BuriLopburi, Thailand
    892.0×
  102. 99JacksonMississippi, United States
    892.0×
  103. 103SaraburiSaraburi, Thailand
    881.9×
  104. 103NeuwiedRheinland-Pfalz, Germany
    881.9×
  105. 103KölnNorth Rhine-Westphalia, Germany
    881.9×
  106. 106JülichNorth Rhine-Westphalia, Germany
    881.9×
  107. 106ThorntonColorado, United States
    881.9×
  108. 108Lat KrabangBangkok, Thailand
    871.9×
  109. 109Kamphaeng PhetKamphaeng Phet, Thailand
    871.9×
  110. 109AachenNorth Rhine-Westphalia, Germany
    871.9×
  111. 111Nong ChokBangkok, Thailand
    871.9×
  112. 112HeerlenLimburg, The Netherlands
    861.9×
  113. 112MonsWallonia, Belgium
    861.9×
  114. 114Nakhon SawanNakhon Sawan, Thailand
    861.9×
  115. 115Ban Talat BuengChon Buri, Thailand
    851.8×
  116. 116Lak SiBangkok, Thailand
    851.8×
  117. 117CheyenneWyoming, United States
    851.8×
  118. 117ReginaSaskatchewan, Canada
    851.8×
  119. 119Bang KapiBangkok, Thailand
    851.8×
  120. 120StilfonteinNorth West, South Africa
    841.8×
  121. 121Suphan BuriSuphan Buri, Thailand
    841.8×
  122. 121LongmontColorado, United States
    841.8×
  123. 121Bueng KumBangkok, Thailand
    841.8×
  124. 124BangkokBangkok, Thailand
    841.8×
  125. 125AntwerpFlanders, Belgium
    841.8×
  126. 126MolFlanders, Belgium
    841.8×
  127. 127Khlong LuangPathum Thani, Thailand
    831.8×
  128. 128JüchenNorth Rhine-Westphalia, Germany
    831.7×
  129. 128CuricóMaule Region, Chile
    831.7×
  130. 130CoquimboCoquimbo Region, Chile
    821.7×
  131. 131SolingenNorth Rhine-Westphalia, Germany
    821.7×
  132. 132TakTak, Thailand
    821.7×
  133. 132BeneventoCampania, Italy
    821.7×
  134. 134SulphurLouisiana, United States
    821.7×
  135. 135BrusselsBrussels Capital, Belgium
    821.7×
  136. 135HattiesburgMississippi, United States
    821.7×
  137. 137Phra PradaengSamut Prakan, Thailand
    821.7×
  138. 138WaregemFlanders, Belgium
    811.7×
  139. 138DüsseldorfNorth Rhine-Westphalia, Germany
    811.7×
  140. 140ThionvilleGrand Est, France
    811.7×
  141. 141Ban ChangRayong, Thailand
    811.7×
  142. 142EvergemFlanders, Belgium
    811.7×
  143. 142Port ArthurTexas, United States
    811.7×
  144. 144Bang Bo DistrictSamut Prakan, Thailand
    811.7×
  145. 144TournaiWallonia, Belgium
    811.7×
  146. 144Marche-en-FamenneWallonia, Belgium
    811.7×
  147. 147WillebroekFlanders, Belgium
    801.7×
  148. 147LeverkusenNorth Rhine-Westphalia, Germany
    801.7×
  149. 147KrefeldNorth Rhine-Westphalia, Germany
    801.7×
  150. 150WormsRheinland-Pfalz, Germany
    801.6×
  151. 150Limburg an der LahnHesse, Germany
    801.6×
  152. 150Colorado SpringsColorado, United States
    801.6×
  153. 153Buri RamBuriram, Thailand
    801.6×
  154. 153GuangzhouGuangdong, China
    801.6×
  155. 153Sai MaiBangkok, Thailand
    801.6×
  156. 156RatchaburiRatchaburi, Thailand
    801.6×
  157. 157KortrijkFlanders, Belgium
    791.6×
  158. 157MönchengladbachNorth Rhine-Westphalia, Germany
    791.6×
  159. 157BaytownTexas, United States
    791.6×
  160. 160Hua HinPrachuap Khiri Khan, Thailand
    791.6×
  161. 160IzegemFlanders, Belgium
    791.6×
  162. 160La PorteTexas, United States
    791.6×
  163. 160LondonOntario, Canada
    791.6×
  164. 164Laem ChabangChon Buri, Thailand
    791.6×
  165. 165Nakhon PathomNakhon Pathom, Thailand
    791.6×
  166. 166Sing BuriSing Buri, Thailand
    781.6×
  167. 166HoustonTexas, United States
    781.6×
  168. 166Missouri CityTexas, United States
    781.6×
  169. 166PasadenaTexas, United States
    781.6×
  170. 170Chai NatChai Nat, Thailand
    781.6×
  171. 171ChanthaburiChanthaburi, Thailand
    781.6×
  172. 171RatingenNorth Rhine-Westphalia, Germany
    781.6×
  173. 171Kansas CityKansas, United States
    781.6×
  174. 174Ban Khlong PrawetBangkok, Thailand
    781.6×
  175. 174TrierRheinland-Pfalz, Germany
    781.6×
  176. 174Bad KreuznachRheinland-Pfalz, Germany
    781.6×
  177. 174Baton RougeLouisiana, United States
    781.6×
  178. 174TexarkanaTexas, United States
    781.6×
  179. 174BoulderColorado, United States
    781.6×
  180. 180Samut SakhonSamut Sakhon, Thailand
    771.6×
  181. 180EssenNorth Rhine-Westphalia, Germany
    771.6×
  182. 182BartlettTennessee, United States
    771.5×
  183. 183YangonYangon, Myanmar
    771.5×
  184. 184Mueang NonthaburiNonthaburi, Thailand
    771.5×
  185. 184Mexico CityMexico City, Mexico
    771.5×
  186. 184SalamancaGuanajuato, Mexico
    771.5×
  187. 184East RidgeTennessee, United States
    771.5×
  188. 188OberhausenNorth Rhine-Westphalia, Germany
    771.5×
  189. 188RengoO'Higgins Region, Chile
    771.5×
  190. 188AntofagastaAntofagasta, Chile
    771.5×
  191. 188León de los AldamaGuanajuato, Mexico
    771.5×
  192. 192BeverenFlanders, Belgium
    761.5×
  193. 193ThabazimbiLimpopo, South Africa
    761.5×
  194. 193ZwijndrechtFlanders, Belgium
    761.5×
  195. 195Tha YangPhetchaburi, Thailand
    761.5×
  196. 195KapellenFlanders, Belgium
    761.5×
  197. 195Flémalle-HauteWallonia, Belgium
    761.5×
  198. 195GalvestonTexas, United States
    761.5×
  199. 199Ludwigshafen am RheinRheinland-Pfalz, Germany
    761.5×
  200. 199ConroeTexas, United States
    761.5×

Top 200 of 1,544 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, May 22, 2023, smogrank.com/history/2023-05-22 (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.