SmogRank / History / May 3, 2023

Most polluted cities on May 3, 2023

1,464 cities ranked by their average PM2.5 over the day; the worst was Bloemfontein, South Africa, at 94.3 µg/m³. Each city's own local calendar day.

Bad-air episodes during May 3, 2023. All episodes.

← Bloemfontein 94.3 µg/m³ 90 µg/m³15 WHO 24-hour guideline
Every city ranked for May 3, 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. 1BloemfonteinFree State, South Africa
    1786.3×
  2. 2Dhakalow-cost sensorsDhaka Division, Bangladesh
    1604.5×
  3. 3CholulaPuebla, Mexico
    1594.5×
  4. 4LinaresMaule Region, Chile
    1584.4×
  5. 5Ubon RatchathaniUbon Ratchathani, Thailand
    1544.0×
  6. 6CelayaGuanajuato, Mexico
    1533.9×
  7. 7GuadalajaraJalisco, Mexico
    1533.9×
  8. 8San Mateo AtencoMéxico, Mexico
    1523.8×
  9. 9Lahorelow-cost sensorsPunjab, Pakistan
    1523.8×
  10. 10BeijingBeijing, China
    1433.5×
  11. 11Puerto VarasLos Lagos Region, Chile
    1383.4×
  12. 12San Salvador TizatlalliMéxico, Mexico
    1363.3×
  13. 13RancaguaO'Higgins Region, Chile
    1313.2×
  14. 14CoronelBiobio, Chile
    1293.1×
  15. 15XonacatlánMéxico, Mexico
    1283.1×
  16. 16Hacienda Santa FeJalisco, Mexico
    1263.0×
  17. 17HualquiBiobio, Chile
    1263.0×
  18. 18Ga-RankuwaNorth West, South Africa
    1243.0×
  19. 18KalasinKalasin, Thailand
    1243.0×
  20. 20ZapopanJalisco, Mexico
    1233.0×
  21. 21Roi EtRoi Et, Thailand
    1233.0×
  22. 22San Francisco TlalcilalcalpanMéxico, Mexico
    1222.9×
  23. 23NanNan, Thailand
    1202.9×
  24. 24SantiagoSantiago Metropolitan, Chile
    1192.9×
  25. 24ChiguayanteBiobio, Chile
    1192.9×
  26. 26BamakoBamako, Mali
    1192.8×
  27. 27LampangLampang, Thailand
    1182.8×
  28. 28Suphan BuriSuphan Buri, Thailand
    1172.8×
  29. 29NacimientoBiobio, Chile
    1162.8×
  30. 30Guatemala CityGuatemala, Guatemala
    1152.8×
  31. 31TolucaMéxico, Mexico
    1152.7×
  32. 32OsornoLos Lagos Region, Chile
    1152.7×
  33. 33Ciudad NezahualcoyotlMéxico, Mexico
    1142.7×
  34. 33RabinalBaja Verapaz, Guatemala
    1142.7×
  35. 35VeracruzVeracruz, Mexico
    1142.7×
  36. 35Silao de la VictoriaGuanajuato, Mexico
    1142.7×
  37. 37Puerto AysénAysén, Chile
    1132.7×
  38. 38San Juan del RíoQuerétaro, Mexico
    1112.6×
  39. 39CuricóMaule Region, Chile
    1112.6×
  40. 40PhayaoPhayao, Thailand
    1102.6×
  41. 41Tha BoNong Khai, Thailand
    1092.6×
  42. 42Si Sa KetSi Sa Ket, Thailand
    1092.6×
  43. 43SalamancaGuanajuato, Mexico
    1072.5×
  44. 44DelhiDelhi, India
    1062.5×
  45. 45TalaganteSantiago Metropolitan, Chile
    1062.5×
  46. 46RengoO'Higgins Region, Chile
    1052.5×
  47. 47QuillotaValparaiso, Chile
    1052.5×
  48. 48Khon KaenKhon Kaen, Thailand
    1042.5×
  49. 49KhartoumKhartoum, Sudan
    1042.4×
  50. 50ToméBiobio, Chile
    1042.4×
  51. 51SukhothaiSukhothai, Thailand
    1032.4×
  52. 52HualpénBiobio, Chile
    1032.4×
  53. 53PakxanBolikhamsai, Laos
    1032.4×
  54. 54Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1022.4×
  55. 55Santiago de QuerétaroQuerétaro, Mexico
    1022.4×
  56. 56GuanajuatoGuanajuato, Mexico
    1012.4×
  57. 57León de los AldamaGuanajuato, Mexico
    1002.3×
  58. 58Kathmandulow-cost sensorsBagmati Province, Nepal
    992.3×
  59. 59Ciudad Benito JuárezNuevo León, Mexico
    992.3×
  60. 60PhraePhrae, Thailand
    982.3×
  61. 60ShenyangLiaoning, China
    982.3×
  62. 62Chai NatChai Nat, Thailand
    982.3×
  63. 63Sing BuriSing Buri, Thailand
    972.3×
  64. 64Tepeji del Río de OcampoHidalgo, Mexico
    972.3×
  65. 65UttaraditUttaradit, Thailand
    972.2×
  66. 65CuernavacaMorelos, Mexico
    972.2×
  67. 67MukdahanMukdahan, Thailand
    962.2×
  68. 67PueblaPuebla, Mexico
    962.2×
  69. 69La UniónLos Ríos Region, Chile
    962.2×
  70. 70TlaxcalaTlaxcala, Mexico
    952.2×
  71. 71San Luis PotosíSan Luis Potosí, Mexico
    952.2×
  72. 72Mexico CityMexico City, Mexico
    942.1×
  73. 73Udon ThaniUdon Thani, Thailand
    942.1×
  74. 74SaltilloCoahuila, Mexico
    942.1×
  75. 75San CarlosÑuble, Chile
    932.1×
  76. 75San Miguel de AllendeGuanajuato, Mexico
    932.1×
  77. 77San Andrés TuxtlaVeracruz, Mexico
    932.1×
  78. 77CauquenesMaule Region, Chile
    932.1×
  79. 79BaghdadBaghdad, Iraq
    922.1×
  80. 79ConcepciónBiobio, Chile
    922.1×
  81. 81Laem ChabangChon Buri, Thailand
    912.1×
  82. 82YangonYangon, Myanmar
    912.0×
  83. 83Jastrzębie ZdrójSilesia, Poland
    902.0×
  84. 84LoeiLoei, Thailand
    902.0×
  85. 85ValdiviaLos Ríos Region, Chile
    902.0×
  86. 86Mae SaiChiang Rai, Thailand
    892.0×
  87. 86Naucalpan de JuárezMéxico, Mexico
    892.0×
  88. 86San Luis de la PazGuanajuato, Mexico
    892.0×
  89. 86Khlong Sam WaBangkok, Thailand
    892.0×
  90. 90TalcaMaule Region, Chile
    892.0×
  91. 91Karachilow-cost sensorsSindh, Pakistan
    892.0×
  92. 92Mae SotTak, Thailand
    892.0×
  93. 92Kinshasalow-cost sensorsKinshasa, Democratic Republic of the Congo
    892.0×
  94. 94Nakhon SawanNakhon Sawan, Thailand
    881.9×
  95. 94IrapuatoGuanajuato, Mexico
    881.9×
  96. 96MexicaliBaja California, Mexico
    881.9×
  97. 97HyderabadTelangana, India
    881.9×
  98. 97QuinteroValparaiso, Chile
    881.9×
  99. 99LamphunLamphun, Thailand
    881.9×
  100. 100AbasoloGuanajuato, Mexico
    871.9×
  101. 101Bang NaBangkok, Thailand
    871.9×
  102. 101Ban HouakhouaBokeo, Laos
    871.9×
  103. 101Puerto MonttLos Lagos Region, Chile
    871.9×
  104. 104Kamphaeng PhetKamphaeng Phet, Thailand
    861.9×
  105. 105Addis AbabaAddis Ababa, Ethiopia
    861.8×
  106. 105Chiang RaiChiang Rai, Thailand
    861.8×
  107. 105Khlong LuangPathum Thani, Thailand
    861.8×
  108. 108BelmopanCayo District, Belize
    851.8×
  109. 109Sakon NakhonSakon Nakhon, Thailand
    851.8×
  110. 110TocopillaAntofagasta, Chile
    851.8×
  111. 111Si Maha PhotPrachin Buri, Thailand
    851.8×
  112. 111PhichitPhichit, Thailand
    851.8×
  113. 113Khan Na YaoBangkok, Thailand
    841.8×
  114. 114ThembisaGauteng, South Africa
    841.8×
  115. 114Nong Bua LamphuNong Bua Lamphu, Thailand
    841.8×
  116. 114Nakhon RatchasimaNakhon Ratchasima, Thailand
    841.8×
  117. 117PhetchabunPhetchabun, Thailand
    831.8×
  118. 117Buri RamBuriram, Thailand
    831.8×
  119. 117TalcahuanoBiobio, Chile
    831.8×
  120. 120HanoiHanoi, Vietnam
    831.7×
  121. 121Pachuca de SotoHidalgo, Mexico
    831.7×
  122. 122TemucoAraucania, Chile
    821.7×
  123. 123AguascalientesAguascalientes, Mexico
    811.7×
  124. 124Chiang MaiChiang Mai, Thailand
    811.7×
  125. 125Ciudad ApodacaNuevo León, Mexico
    801.7×
  126. 125Bueng KumBangkok, Thailand
    801.7×
  127. 127Nong ChokBangkok, Thailand
    801.6×
  128. 128LotaBiobio, Chile
    801.6×
  129. 128ChillánÑuble, Chile
    801.6×
  130. 130ChaiyaphumChaiyaphum, Thailand
    791.6×
  131. 131Lak SiBangkok, Thailand
    791.6×
  132. 132ValjevoCentral Serbia, Serbia
    791.6×
  133. 133Saphan SungBangkok, Thailand
    781.6×
  134. 134Sai MaiBangkok, Thailand
    781.6×
  135. 135CoyhaiqueAysén, Chile
    781.6×
  136. 136Lop BuriLopburi, Thailand
    771.6×
  137. 137Lat KrabangBangkok, Thailand
    771.5×
  138. 138BrawleyCalifornia, United States
    771.5×
  139. 139GuangzhouGuangdong, China
    771.5×
  140. 140Nong KhaemBangkok, Thailand
    771.5×
  141. 141La SerenaCoquimbo Region, Chile
    761.5×
  142. 142ThabazimbiLimpopo, South Africa
    761.5×
  143. 142Ban ChangRayong, Thailand
    761.5×
  144. 144ConcónValparaiso, Chile
    761.5×
  145. 145Viña del MarValparaiso, Chile
    761.5×
  146. 146AntofagastaAntofagasta, Chile
    751.5×
  147. 146GarcíaNuevo León, Mexico
    751.5×
  148. 148Ban Samae DamBangkok, Thailand
    751.5×
  149. 149ChanthaburiChanthaburi, Thailand
    751.5×
  150. 150DushanbeDushanbe, Tajikistan
    751.5×
  151. 151Bang KapiBangkok, Thailand
    741.4×
  152. 151BéthuneHauts-de-France, France
    741.4×
  153. 151CoquimboCoquimbo Region, Chile
    741.4×
  154. 154RatchaburiRatchaburi, Thailand
    741.4×
  155. 155PristinaPristina, Kosovo
    741.4×
  156. 155AstanaAstana, Kazakhstan
    741.4×
  157. 155SaraburiSaraburi, Thailand
    741.4×
  158. 158AntananarivoAnalamanga, Madagascar
    731.4×
  159. 158TratTrat, Thailand
    731.4×
  160. 160CuranilahueBiobio, Chile
    731.4×
  161. 161Czechowice-DziedziceSilesia, Poland
    731.4×
  162. 162Santa CatarinaNuevo León, Mexico
    731.4×
  163. 162MonterreyNuevo León, Mexico
    731.4×
  164. 164Wan ChaiWan Chai, Hong Kong
    721.4×
  165. 164CopiapóAtacama, Chile
    721.4×
  166. 166BangkokBangkok, Thailand
    721.4×
  167. 167AthensAttica, Greece
    711.3×
  168. 168Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    711.3×
  169. 169VereenigingGauteng, South Africa
    711.3×
  170. 169RayongRayong, Thailand
    711.3×
  171. 171AsprópyrgosAttica, Greece
    691.3×
  172. 171Bang Bo DistrictSamut Prakan, Thailand
    691.3×
  173. 171Mong KokYau Tsim Mong District, Hong Kong
    691.3×
  174. 174Ban Khlong PrawetBangkok, Thailand
    691.3×
  175. 175Samut PrakanSamut Prakan, Thailand
    691.2×
  176. 175Ban Talat BuengChon Buri, Thailand
    691.2×
  177. 177Mueang NonthaburiNonthaburi, Thailand
    691.2×
  178. 177Frýdek-MístekMoravian-Silesian Region, Czechia
    691.2×
  179. 179JohannesburgGauteng, South Africa
    691.2×
  180. 179KanchanaburiKanchanaburi, Thailand
    691.2×
  181. 179KrakówLesser Poland, Poland
    691.2×
  182. 182AcharnésAttica, Greece
    681.2×
  183. 182Bielsko-BialaSilesia, Poland
    681.2×
  184. 184Novi PazarCentral Serbia, Serbia
    681.2×
  185. 185Český TěšínMoravian-Silesian Region, Czechia
    671.2×
  186. 185Banja LukaSrpska, Bosnia and Herzegovina
    671.2×
  187. 187Islamabadlow-cost sensorsIslamabad, Pakistan
    671.2×
  188. 187HavířovMoravian-Silesian Region, Czechia
    671.2×
  189. 189Ciudad JuárezChihuahua, Mexico
    671.2×
  190. 190AranyaprathetSa Kaeo, Thailand
    661.2×
  191. 191YalaYala, Thailand
    661.1×
  192. 192HuelvaAndalusia, Spain
    661.1×
  193. 192Los ÁngelesBiobio, Chile
    661.1×
  194. 194TarnówLesser Poland, Poland
    661.1×
  195. 194Sankt PöltenLower Austria, Austria
    661.1×
  196. 194RacibórzSilesia, Poland
    661.1×
  197. 197KigaliKigali, Rwanda
    651.1×
  198. 197ConakryConakry, Guinea
    651.1×
  199. 199CalamaAntofagasta, Chile
    651.1×
  200. 200Ciudad General EscobedoNuevo León, Mexico
    651.1×

Top 200 of 1,464 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 3, 2023, smogrank.com/history/2023-05-03 (accessed 2 Oct 2026).

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