SmogRank / History / May 2, 2023

Most polluted cities on May 2, 2023

1,497 cities ranked by their average PM2.5 over the day; the worst was Piedras Negras, Mexico, at 355.0 µg/m³. Each city's own local calendar day.

← Piedras Negras 355.0 µg/m³ 300 µg/m³15 WHO 24-hour guideline
Every city ranked for May 2, 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. 1Piedras NegrasCoahuila, Mexico
    500+23.7×
  2. 2Dhakalow-cost sensorsDhaka Division, Bangladesh
    1624.8×
  3. 3OsornoLos Lagos Region, Chile
    1594.5×
  4. 4PhayaoPhayao, Thailand
    1533.8×
  5. 5LormontNew Aquitaine, France
    1523.8×
  6. 6LampangLampang, Thailand
    1513.7×
  7. 7BeijingBeijing, China
    1443.5×
  8. 8GuadalajaraJalisco, Mexico
    1373.4×
  9. 9Hacienda Santa FeJalisco, Mexico
    1353.3×
  10. 10BloemfonteinFree State, South Africa
    1343.3×
  11. 11NanNan, Thailand
    1343.3×
  12. 12Suphan BuriSuphan Buri, Thailand
    1333.2×
  13. 13BamakoBamako, Mali
    1323.2×
  14. 14UttaraditUttaradit, Thailand
    1283.1×
  15. 15CoronelBiobio, Chile
    1273.1×
  16. 16Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1243.0×
  17. 17San Salvador TizatlalliMéxico, Mexico
    1222.9×
  18. 18Ga-RankuwaNorth West, South Africa
    1202.9×
  19. 19CholulaPuebla, Mexico
    1172.8×
  20. 20Kathmandulow-cost sensorsBagmati Province, Nepal
    1172.8×
  21. 21Mae SotTak, Thailand
    1162.8×
  22. 21CelayaGuanajuato, Mexico
    1162.8×
  23. 23Ubon RatchathaniUbon Ratchathani, Thailand
    1142.7×
  24. 23ValdiviaLos Ríos Region, Chile
    1142.7×
  25. 25PhraePhrae, Thailand
    1132.7×
  26. 25RabinalBaja Verapaz, Guatemala
    1132.7×
  27. 25Guatemala CityGuatemala, Guatemala
    1132.7×
  28. 28TemucoAraucania, Chile
    1112.6×
  29. 29CoyhaiqueAysén, Chile
    1092.6×
  30. 30Puerto VarasLos Lagos Region, Chile
    1072.5×
  31. 30ZapopanJalisco, Mexico
    1072.5×
  32. 32Kamphaeng PhetKamphaeng Phet, Thailand
    1072.5×
  33. 32DelhiDelhi, India
    1072.5×
  34. 34San Mateo AtencoMéxico, Mexico
    1062.5×
  35. 35YangonYangon, Myanmar
    1042.5×
  36. 36HanoiHanoi, Vietnam
    1042.4×
  37. 36HualquiBiobio, Chile
    1042.4×
  38. 38ThembisaGauteng, South Africa
    1032.4×
  39. 39AshgabatAshgabat, Turkmenistan
    1022.4×
  40. 39SukhothaiSukhothai, Thailand
    1022.4×
  41. 39Khlong Sam WaBangkok, Thailand
    1022.4×
  42. 42Tha BoNong Khai, Thailand
    1022.4×
  43. 43TalcahuanoBiobio, Chile
    1012.4×
  44. 44Chai NatChai Nat, Thailand
    1012.4×
  45. 45Laem ChabangChon Buri, Thailand
    992.3×
  46. 45Bueng KumBangkok, Thailand
    992.3×
  47. 47Bang NaBangkok, Thailand
    992.3×
  48. 48SantiagoSantiago Metropolitan, Chile
    982.3×
  49. 49Si Sa KetSi Sa Ket, Thailand
    982.3×
  50. 50XonacatlánMéxico, Mexico
    982.3×
  51. 51Lahorelow-cost sensorsPunjab, Pakistan
    972.3×
  52. 52CuernavacaMorelos, Mexico
    972.3×
  53. 53Saphan SungBangkok, Thailand
    962.2×
  54. 54TakTak, Thailand
    962.2×
  55. 55La UniónLos Ríos Region, Chile
    962.2×
  56. 56TalaganteSantiago Metropolitan, Chile
    962.2×
  57. 56CauquenesMaule Region, Chile
    962.2×
  58. 56Khan Na YaoBangkok, Thailand
    962.2×
  59. 59Bang KapiBangkok, Thailand
    952.2×
  60. 60LamphunLamphun, Thailand
    942.2×
  61. 61Roi EtRoi Et, Thailand
    942.1×
  62. 61BelmopanCayo District, Belize
    942.1×
  63. 63TocopillaAntofagasta, Chile
    942.1×
  64. 64Sing BuriSing Buri, Thailand
    932.1×
  65. 64GuanajuatoGuanajuato, Mexico
    932.1×
  66. 66TolucaMéxico, Mexico
    932.1×
  67. 67Lat KrabangBangkok, Thailand
    932.1×
  68. 68Khlong LuangPathum Thani, Thailand
    922.1×
  69. 69Lak SiBangkok, Thailand
    912.1×
  70. 70Kinshasalow-cost sensorsKinshasa, Democratic Republic of the Congo
    912.0×
  71. 71GuangzhouGuangdong, China
    912.0×
  72. 71San CarlosÑuble, Chile
    912.0×
  73. 73San Andrés TuxtlaVeracruz, Mexico
    912.0×
  74. 74RatchaburiRatchaburi, Thailand
    902.0×
  75. 75Abidjanlow-cost sensorsAbidjan Autonomous District, Ivory Coast
    902.0×
  76. 75Sai MaiBangkok, Thailand
    902.0×
  77. 77Nong KhaemBangkok, Thailand
    902.0×
  78. 77ChiguayanteBiobio, Chile
    902.0×
  79. 79Chiang RaiChiang Rai, Thailand
    892.0×
  80. 79Ban Khlong PrawetBangkok, Thailand
    892.0×
  81. 79RancaguaO'Higgins Region, Chile
    892.0×
  82. 82PhichitPhichit, Thailand
    892.0×
  83. 82LinaresMaule Region, Chile
    892.0×
  84. 84Nong ChokBangkok, Thailand
    892.0×
  85. 85TlaxcalaTlaxcala, Mexico
    892.0×
  86. 86ĆuprijaCentral Serbia, Serbia
    892.0×
  87. 86KalasinKalasin, Thailand
    892.0×
  88. 88Si Maha PhotPrachin Buri, Thailand
    881.9×
  89. 89PakxanBolikhamsai, Laos
    881.9×
  90. 90VeracruzVeracruz, Mexico
    871.9×
  91. 91NacimientoBiobio, Chile
    871.9×
  92. 92Chiang MaiChiang Mai, Thailand
    871.9×
  93. 93Udon ThaniUdon Thani, Thailand
    861.9×
  94. 94Ciudad NezahualcoyotlMéxico, Mexico
    861.8×
  95. 94SalamancaGuanajuato, Mexico
    861.8×
  96. 94Santiago de QuerétaroQuerétaro, Mexico
    861.8×
  97. 97KigaliKigali, Rwanda
    851.8×
  98. 98BangkokBangkok, Thailand
    851.8×
  99. 99JohannesburgGauteng, South Africa
    851.8×
  100. 100JakartaJakarta, Indonesia
    841.8×
  101. 101Puente AltoSantiago Metropolitan, Chile
    841.8×
  102. 101ConcepciónBiobio, Chile
    841.8×
  103. 103Ban Samae DamBangkok, Thailand
    841.8×
  104. 104PhetchabunPhetchabun, Thailand
    841.8×
  105. 104RengoO'Higgins Region, Chile
    841.8×
  106. 104Ciudad Benito JuárezNuevo León, Mexico
    841.8×
  107. 107León de los AldamaGuanajuato, Mexico
    831.8×
  108. 108San Francisco TlalcilalcalpanMéxico, Mexico
    831.8×
  109. 109LoeiLoei, Thailand
    831.8×
  110. 109ChaiyaphumChaiyaphum, Thailand
    831.8×
  111. 109CuricóMaule Region, Chile
    831.8×
  112. 112Nakhon SawanNakhon Sawan, Thailand
    831.7×
  113. 113QuinteroValparaiso, Chile
    821.7×
  114. 114IrapuatoGuanajuato, Mexico
    821.7×
  115. 115Addis AbabaAddis Ababa, Ethiopia
    821.7×
  116. 115Mueang NonthaburiNonthaburi, Thailand
    821.7×
  117. 115Ban ChangRayong, Thailand
    821.7×
  118. 115Mexico CityMexico City, Mexico
    821.7×
  119. 119Puerto MonttLos Lagos Region, Chile
    821.7×
  120. 120Karachilow-cost sensorsSindh, Pakistan
    811.7×
  121. 121PueblaPuebla, Mexico
    811.7×
  122. 122MukdahanMukdahan, Thailand
    811.7×
  123. 122Lop BuriLopburi, Thailand
    811.7×
  124. 122Bang Bo DistrictSamut Prakan, Thailand
    811.7×
  125. 125San Luis de la PazGuanajuato, Mexico
    801.7×
  126. 126Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    801.6×
  127. 126Nakhon RatchasimaNakhon Ratchasima, Thailand
    801.6×
  128. 126Lagoslow-cost sensorsLagos, Nigeria
    801.6×
  129. 129Ban Talat BuengChon Buri, Thailand
    801.6×
  130. 130PristinaPristina, Kosovo
    801.6×
  131. 130RayongRayong, Thailand
    801.6×
  132. 132TalcaMaule Region, Chile
    791.6×
  133. 133Puerto AysénAysén, Chile
    791.6×
  134. 133AntofagastaAntofagasta, Chile
    791.6×
  135. 133Silao de la VictoriaGuanajuato, Mexico
    791.6×
  136. 136AntananarivoAnalamanga, Madagascar
    791.6×
  137. 137ValjevoCentral Serbia, Serbia
    781.6×
  138. 138Novi PazarCentral Serbia, Serbia
    781.6×
  139. 138Nong Bua LamphuNong Bua Lamphu, Thailand
    781.6×
  140. 138San Juan del RíoQuerétaro, Mexico
    781.6×
  141. 141StilfonteinNorth West, South Africa
    781.6×
  142. 141La SerenaCoquimbo Region, Chile
    781.6×
  143. 143MexicaliBaja California, Mexico
    771.6×
  144. 144SasolburgFree State, South Africa
    771.5×
  145. 144CuranilahueBiobio, Chile
    771.5×
  146. 146CoquimboCoquimbo Region, Chile
    771.5×
  147. 146ChillánÑuble, Chile
    771.5×
  148. 148SaraburiSaraburi, Thailand
    761.5×
  149. 148CopiapóAtacama, Chile
    761.5×
  150. 150SalorTashkent Region, Uzbekistan
    761.5×
  151. 151Pachuca de SotoHidalgo, Mexico
    741.4×
  152. 152KanchanaburiKanchanaburi, Thailand
    741.4×
  153. 152Sakon NakhonSakon Nakhon, Thailand
    741.4×
  154. 152Phra PradaengSamut Prakan, Thailand
    741.4×
  155. 152ChanthaburiChanthaburi, Thailand
    741.4×
  156. 152Wan ChaiWan Chai, Hong Kong
    741.4×
  157. 152Banja LukaSrpska, Bosnia and Herzegovina
    741.4×
  158. 158KhartoumKhartoum, Sudan
    741.4×
  159. 159GarcíaNuevo León, Mexico
    731.4×
  160. 159AbasoloGuanajuato, Mexico
    731.4×
  161. 161AthensAttica, Greece
    731.4×
  162. 162Ciudad JuárezChihuahua, Mexico
    731.4×
  163. 163AguascalientesAguascalientes, Mexico
    731.4×
  164. 164Mae SaiChiang Rai, Thailand
    721.4×
  165. 164Samut PrakanSamut Prakan, Thailand
    721.4×
  166. 166ShenyangLiaoning, China
    721.4×
  167. 167DushanbeDushanbe, Tajikistan
    721.4×
  168. 168BurgosCastille and León, Spain
    721.3×
  169. 168Santa CatarinaNuevo León, Mexico
    721.3×
  170. 170HyderabadTelangana, India
    711.3×
  171. 171ConcónValparaiso, Chile
    711.3×
  172. 172UmeåVästerbotten, Sweden
    711.3×
  173. 172Nakhon PathomNakhon Pathom, Thailand
    711.3×
  174. 174Buri RamBuriram, Thailand
    701.3×
  175. 175Islamabadlow-cost sensorsIslamabad, Pakistan
    701.3×
  176. 175San Miguel de AllendeGuanajuato, Mexico
    701.3×
  177. 177Hua HinPrachuap Khiri Khan, Thailand
    701.3×
  178. 178AsprópyrgosAttica, Greece
    701.3×
  179. 179BaghdadBaghdad, Iraq
    701.3×
  180. 179WormsRheinland-Pfalz, Germany
    701.3×
  181. 181VanderbijlparkGauteng, South Africa
    691.3×
  182. 182TratTrat, Thailand
    691.3×
  183. 182RacibórzSilesia, Poland
    691.3×
  184. 184YalaYala, Thailand
    691.3×
  185. 184Mong KokYau Tsim Mong District, Hong Kong
    691.3×
  186. 186Viña del MarValparaiso, Chile
    691.2×
  187. 186MonterreyNuevo León, Mexico
    691.2×
  188. 188KlerksdorpNorth West, South Africa
    681.2×
  189. 188LotaBiobio, Chile
    681.2×
  190. 190KoblenzRheinland-Pfalz, Germany
    681.2×
  191. 190BogotáBogota D.C., Colombia
    681.2×
  192. 192AcharnésAttica, Greece
    671.2×
  193. 192Los ÁngelesBiobio, Chile
    671.2×
  194. 194Samut SakhonSamut Sakhon, Thailand
    671.2×
  195. 195PrešovPrešov Region, Slovakia
    671.2×
  196. 196KošiceKošice Region, Slovakia
    671.2×
  197. 197BohumínMoravian-Silesian Region, Czechia
    671.2×
  198. 197Czechowice-DziedziceSilesia, Poland
    671.2×
  199. 197CalamaAntofagasta, Chile
    671.2×
  200. 200AranyaprathetSa Kaeo, Thailand
    661.2×

Top 200 of 1,497 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 2, 2023, smogrank.com/history/2023-05-02 (accessed 2 Oct 2026).

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