SmogRank / History / May 7, 2023

Most polluted cities on May 7, 2023

1,556 cities ranked by their average PM2.5 over the day; the worst was Włocławek, Poland, at 113.0 µg/m³. Each city's own local calendar day.

← Włocławek 113.0 µg/m³ 100 µg/m³15 WHO 24-hour guideline
Every city ranked for May 7, 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. 1WłocławekKujawsko-Pomorskie, Poland
    1917.5×
  2. 2Fort St. JohnBritish Columbia, Canada
    1836.7×
  3. 3RancaguaO'Higgins Region, Chile
    1715.6×
  4. 4SantiagoSantiago Metropolitan, Chile
    1705.5×
  5. 5BeneventoCampania, Italy
    1695.4×
  6. 6TalaganteSantiago Metropolitan, Chile
    1685.3×
  7. 7NanNan, Thailand
    1614.7×
  8. 8Dhakalow-cost sensorsDhaka Division, Bangladesh
    1604.6×
  9. 9Puente AltoSantiago Metropolitan, Chile
    1594.4×
  10. 10ChillánÑuble, Chile
    1554.1×
  11. 11DelhiDelhi, India
    1523.8×
  12. 12NacimientoBiobio, Chile
    1523.8×
  13. 13PakxanBolikhamsai, Laos
    1483.6×
  14. 14LampangLampang, Thailand
    1483.6×
  15. 15Tha BoNong Khai, Thailand
    1443.5×
  16. 16Mae SaiChiang Rai, Thailand
    1433.5×
  17. 17Chiang MaiChiang Mai, Thailand
    1423.5×
  18. 18UttaraditUttaradit, Thailand
    1423.5×
  19. 19PhayaoPhayao, Thailand
    1413.5×
  20. 20PhraePhrae, Thailand
    1403.4×
  21. 20San CarlosÑuble, Chile
    1403.4×
  22. 22Chiang RaiChiang Rai, Thailand
    1373.4×
  23. 23KolkataWest Bengal, India
    1343.3×
  24. 24HualquiBiobio, Chile
    1343.3×
  25. 25MukdahanMukdahan, Thailand
    1303.1×
  26. 26Los ÁngelesBiobio, Chile
    1293.1×
  27. 27LoeiLoei, Thailand
    1283.1×
  28. 28Ubon RatchathaniUbon Ratchathani, Thailand
    1283.1×
  29. 29QuillotaValparaiso, Chile
    1273.1×
  30. 30LinaresMaule Region, Chile
    1273.1×
  31. 31BelmopanCayo District, Belize
    1263.0×
  32. 32ToméBiobio, Chile
    1233.0×
  33. 33CuricóMaule Region, Chile
    1222.9×
  34. 34HanoiHanoi, Vietnam
    1222.9×
  35. 34CuranilahueBiobio, Chile
    1222.9×
  36. 36CoronelBiobio, Chile
    1182.8×
  37. 37BaghdadBaghdad, Iraq
    1172.8×
  38. 37Puerto VarasLos Lagos Region, Chile
    1172.8×
  39. 39JakartaJakarta, Indonesia
    1172.8×
  40. 40KigaliKigali, Rwanda
    1162.8×
  41. 41Fort McMurrayAlberta, Canada
    1162.8×
  42. 42LamphunLamphun, Thailand
    1152.7×
  43. 43PhetchabunPhetchabun, Thailand
    1142.7×
  44. 44Udon ThaniUdon Thani, Thailand
    1132.7×
  45. 44KalasinKalasin, Thailand
    1132.7×
  46. 46CoyhaiqueAysén, Chile
    1122.7×
  47. 47Grande PrairieAlberta, Canada
    1102.6×
  48. 48CelayaGuanajuato, Mexico
    1092.6×
  49. 49CauquenesMaule Region, Chile
    1092.6×
  50. 50Ga-RankuwaNorth West, South Africa
    1092.6×
  51. 51RabinalBaja Verapaz, Guatemala
    1082.6×
  52. 52Guatemala CityGuatemala, Guatemala
    1082.6×
  53. 53HualpénBiobio, Chile
    1062.5×
  54. 54Nong Bua LamphuNong Bua Lamphu, Thailand
    1052.5×
  55. 55ConcepciónBiobio, Chile
    1052.5×
  56. 56DushanbeDushanbe, Tajikistan
    1042.5×
  57. 57PhichitPhichit, Thailand
    1032.4×
  58. 57Viña del MarValparaiso, Chile
    1032.4×
  59. 59Lop BuriLopburi, Thailand
    992.3×
  60. 60Roi EtRoi Et, Thailand
    992.3×
  61. 61ChiguayanteBiobio, Chile
    992.3×
  62. 62TalcaMaule Region, Chile
    982.3×
  63. 63Kathmandulow-cost sensorsBagmati Province, Nepal
    982.3×
  64. 64ChennaiTamil Nadu, India
    982.3×
  65. 65QuinteroValparaiso, Chile
    972.3×
  66. 66Sakon NakhonSakon Nakhon, Thailand
    972.3×
  67. 67Addis AbabaAddis Ababa, Ethiopia
    972.2×
  68. 68ConcónValparaiso, Chile
    962.2×
  69. 69Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    962.2×
  70. 69León de los AldamaGuanajuato, Mexico
    962.2×
  71. 71AbasoloGuanajuato, Mexico
    952.2×
  72. 72CoquimboCoquimbo Region, Chile
    942.1×
  73. 73Ban HouakhouaBokeo, Laos
    932.1×
  74. 74TalcahuanoBiobio, Chile
    922.1×
  75. 75SaraburiSaraburi, Thailand
    912.0×
  76. 76SukhothaiSukhothai, Thailand
    902.0×
  77. 76Karachilow-cost sensorsSindh, Pakistan
    902.0×
  78. 76Suphan BuriSuphan Buri, Thailand
    902.0×
  79. 79Puerto AysénAysén, Chile
    902.0×
  80. 80Si Sa KetSi Sa Ket, Thailand
    902.0×
  81. 81OsornoLos Lagos Region, Chile
    902.0×
  82. 82Şabāḩ as SālimMubārak al Kabīr, Kuwait
    902.0×
  83. 82SalamancaGuanajuato, Mexico
    902.0×
  84. 84Mae SotTak, Thailand
    881.9×
  85. 84Kamphaeng PhetKamphaeng Phet, Thailand
    881.9×
  86. 86PristinaPristina, Kosovo
    881.9×
  87. 87Khon KaenKhon Kaen, Thailand
    881.9×
  88. 88Nakhon SawanNakhon Sawan, Thailand
    881.9×
  89. 89ChaiyaphumChaiyaphum, Thailand
    871.9×
  90. 90Khan Na YaoBangkok, Thailand
    871.9×
  91. 91ThembisaGauteng, South Africa
    871.9×
  92. 92Chai NatChai Nat, Thailand
    861.9×
  93. 92AnconaThe Marches, Italy
    861.9×
  94. 92LotaBiobio, Chile
    861.9×
  95. 95Lahorelow-cost sensorsPunjab, Pakistan
    861.9×
  96. 95Si Maha PhotPrachin Buri, Thailand
    861.9×
  97. 97GuanajuatoGuanajuato, Mexico
    861.9×
  98. 98Khlong Sam WaBangkok, Thailand
    861.8×
  99. 99Bang NaBangkok, Thailand
    851.8×
  100. 100Kinshasalow-cost sensorsKinshasa, Democratic Republic of the Congo
    851.8×
  101. 101La UniónLos Ríos Region, Chile
    841.8×
  102. 102's-GravenzandeSouth Holland, The Netherlands
    831.8×
  103. 103Silao de la VictoriaGuanajuato, Mexico
    821.7×
  104. 104AntofagastaAntofagasta, Chile
    821.7×
  105. 105IrapuatoGuanajuato, Mexico
    821.7×
  106. 105Lak SiBangkok, Thailand
    821.7×
  107. 107Sing BuriSing Buri, Thailand
    811.7×
  108. 107RayongRayong, Thailand
    811.7×
  109. 109ValdiviaLos Ríos Region, Chile
    811.7×
  110. 110HyderabadTelangana, India
    811.7×
  111. 110La SerenaCoquimbo Region, Chile
    811.7×
  112. 112Saphan SungBangkok, Thailand
    801.7×
  113. 113The HagueSouth Holland, The Netherlands
    801.6×
  114. 114Puerto MonttLos Lagos Region, Chile
    801.6×
  115. 115Nakhon RatchasimaNakhon Ratchasima, Thailand
    801.6×
  116. 116San Pedro de la PazBiobio, Chile
    791.6×
  117. 117Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    791.6×
  118. 118CopiapóAtacama, Chile
    791.6×
  119. 118Lat KrabangBangkok, Thailand
    791.6×
  120. 120Nong KhaemBangkok, Thailand
    781.6×
  121. 121AricaArica y Parinacota Region, Chile
    771.5×
  122. 121Alto HospicioTarapacá, Chile
    771.5×
  123. 123Buri RamBuriram, Thailand
    761.5×
  124. 124Bang Bo DistrictSamut Prakan, Thailand
    761.5×
  125. 125LaredoTexas, United States
    761.5×
  126. 126Eagle PassTexas, United States
    751.5×
  127. 127YangonYangon, Myanmar
    751.5×
  128. 128Bang KapiBangkok, Thailand
    741.4×
  129. 129Mexico CityMexico City, Mexico
    741.4×
  130. 130SalorTashkent Region, Uzbekistan
    741.4×
  131. 131TemucoAraucania, Chile
    741.4×
  132. 132Laem ChabangChon Buri, Thailand
    741.4×
  133. 132Bueng KumBangkok, Thailand
    741.4×
  134. 134San Miguel de AllendeGuanajuato, Mexico
    731.4×
  135. 135BangkokBangkok, Thailand
    731.4×
  136. 136Ban ChangRayong, Thailand
    731.4×
  137. 136BeijingBeijing, China
    731.4×
  138. 138Khlong LuangPathum Thani, Thailand
    731.4×
  139. 139MaassluisSouth Holland, The Netherlands
    721.4×
  140. 140BakuBaki, Azerbaijan
    721.4×
  141. 141Phra PradaengSamut Prakan, Thailand
    711.3×
  142. 141Ban Talat BuengChon Buri, Thailand
    711.3×
  143. 141Sai MaiBangkok, Thailand
    711.3×
  144. 144AshgabatAshgabat, Turkmenistan
    711.3×
  145. 144Jastrzębie ZdrójSilesia, Poland
    711.3×
  146. 146Ban Khlong PrawetBangkok, Thailand
    701.3×
  147. 147ConakryConakry, Guinea
    701.3×
  148. 148GuangzhouGuangdong, China
    701.3×
  149. 148OdessaTexas, United States
    701.3×
  150. 150WeidenBavaria, Germany
    701.3×
  151. 151RatchaburiRatchaburi, Thailand
    701.3×
  152. 151ChanthaburiChanthaburi, Thailand
    701.3×
  153. 151AranyaprathetSa Kaeo, Thailand
    701.3×
  154. 151HillegomSouth Holland, The Netherlands
    701.3×
  155. 155Ciudad JuárezChihuahua, Mexico
    691.3×
  156. 156Islamabadlow-cost sensorsIslamabad, Pakistan
    691.3×
  157. 157Mueang NonthaburiNonthaburi, Thailand
    691.2×
  158. 158ShenyangLiaoning, China
    691.2×
  159. 158Naucalpan de JuárezMéxico, Mexico
    691.2×
  160. 158RichmondCalifornia, United States
    691.2×
  161. 161TratTrat, Thailand
    691.2×
  162. 162Velsen-ZuidNorth Holland, The Netherlands
    681.2×
  163. 162Corpus ChristiTexas, United States
    681.2×
  164. 164TocopillaAntofagasta, Chile
    681.2×
  165. 164EdinburgTexas, United States
    681.2×
  166. 166Hua HinPrachuap Khiri Khan, Thailand
    681.2×
  167. 167CalamaAntofagasta, Chile
    671.2×
  168. 168TexarkanaTexas, United States
    671.2×
  169. 169MumbaiMaharashtra, India
    671.2×
  170. 169Nakhon PathomNakhon Pathom, Thailand
    671.2×
  171. 171KanchanaburiKanchanaburi, Thailand
    671.2×
  172. 171YalaYala, Thailand
    671.2×
  173. 173MilwaukeeWisconsin, United States
    661.1×
  174. 174Mount VernonWashington, United States
    661.1×
  175. 175Wan ChaiWan Chai, Hong Kong
    661.1×
  176. 176DunkirkHauts-de-France, France
    651.1×
  177. 177Hat YaiSongkhla, Thailand
    651.1×
  178. 177PesaroThe Marches, Italy
    651.1×
  179. 179BaytownTexas, United States
    641.1×
  180. 180RidderkerkSouth Holland, The Netherlands
    641.1×
  181. 181RotterdamSouth Holland, The Netherlands
    641.1×
  182. 181OsnabrückLower Saxony, Germany
    641.1×
  183. 183MaldegemFlanders, Belgium
    641.1×
  184. 184AntananarivoAnalamanga, Madagascar
    631.1×
  185. 185FriesoytheLower Saxony, Germany
    631.0×
  186. 185ZionIllinois, United States
    631.0×
  187. 187KoksijdeFlanders, Belgium
    631.0×
  188. 187HavířovMoravian-Silesian Region, Czechia
    631.0×
  189. 189OlatheKansas, United States
    631.0×
  190. 190JeddahMecca Region, Saudi Arabia
    631.0×
  191. 190GreenvilleSouth Carolina, United States
    631.0×
  192. 190East ChicagoIndiana, United States
    631.0×
  193. 193BetongYala, Thailand
    621.0×
  194. 193LingenLower Saxony, Germany
    621.0×
  195. 195Samut SakhonSamut Sakhon, Thailand
    621.0×
  196. 196Mission BendTexas, United States
    621.0×
  197. 197Novi PazarCentral Serbia, Serbia
    621.0×
  198. 198AcharnésAttica, Greece
    611.0×
  199. 199AstanaAstana, Kazakhstan
    611.0×
  200. 199St. LouisMissouri, United States
    611.0×

Top 200 of 1,556 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 7, 2023, smogrank.com/history/2023-05-07 (accessed 2 Oct 2026).

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