SmogRank / History / May 23, 2025

Most polluted cities on May 23, 2025

2,688 cities ranked by their average PM2.5 over the day; the worst was San Carlos, Chile, at 153.0 µg/m³. Each city's own local calendar day.

← San Carlos 153.0 µg/m³ 100 µg/m³15 WHO 24-hour guideline
Every city ranked for May 23, 2025, 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. 1San CarlosÑuble, Chile
    22810.2×
  2. 2Puerto VarasLos Lagos Region, Chile
    2058.7×
  3. 3CuddaloreTamil Nadu, India
    1998.3×
  4. 4LinaresMaule Region, Chile
    1978.1×
  5. 5NacimientoBiobio, Chile
    1897.3×
  6. 6BhiwandiMaharashtra, India
    1887.2×
  7. 7HualpénBiobio, Chile
    1867.0×
  8. 8TemucoAraucania, Chile
    1816.6×
  9. 9ChillánÑuble, Chile
    1796.4×
  10. 10CoronelBiobio, Chile
    1756.0×
  11. 11CoyhaiqueAysén, Chile
    1725.7×
  12. 12Santa Anita - Los FicusLima region, Peru
    1695.4×
  13. 13CuricóMaule Region, Chile
    1685.4×
  14. 14KishanganjBihar, India
    1685.3×
  15. 15RamanathapuramTamil Nadu, India
    1685.3×
  16. 16OsornoLos Lagos Region, Chile
    1685.3×
  17. 17CuranilahueBiobio, Chile
    1665.2×
  18. 18TirupparangunramTamil Nadu, India
    1655.0×
  19. 19TalcahuanoBiobio, Chile
    1645.0×
  20. 20TalcaMaule Region, Chile
    1624.8×
  21. 21KhargharMaharashtra, India
    1624.7×
  22. 22SangāreddiTelangana, India
    1614.7×
  23. 23SantiagoSantiago Metropolitan, Chile
    1594.4×
  24. 24BathindaPunjab, India
    1584.4×
  25. 25KoppalKarnataka, India
    1584.3×
  26. 26VapiGujarat, India
    1574.3×
  27. 27DushanbeDushanbe, Tajikistan
    1574.3×
  28. 28TalaganteSantiago Metropolitan, Chile
    1564.2×
  29. 29TuxtlaChiapas, Mexico
    1564.2×
  30. 30Sri GanganagarRajasthan, India
    1564.1×
  31. 31ToméBiobio, Chile
    1554.1×
  32. 32KeonjhargarhOdisha, India
    1554.0×
  33. 33RengoO'Higgins Region, Chile
    1544.0×
  34. 34MalegaonMaharashtra, India
    1544.0×
  35. 35NarelaDelhi, India
    1533.9×
  36. 35TlaquepaqueJalisco, Mexico
    1533.9×
  37. 37Los ÁngelesBiobio, Chile
    1533.9×
  38. 38Puerto MonttLos Lagos Region, Chile
    1533.8×
  39. 39DhuleMaharashtra, India
    1523.8×
  40. 40ConcepciónBiobio, Chile
    1513.7×
  41. 41MuzaffarnagarUttar Pradesh, India
    1483.6×
  42. 42AhmedabadGujarat, India
    1473.6×
  43. 43La UniónLos Ríos Region, Chile
    1473.6×
  44. 44LudhianaPunjab, India
    1473.6×
  45. 45PāliRajasthan, India
    1463.6×
  46. 46RancaguaO'Higgins Region, Chile
    1453.6×
  47. 47PrayagrajUttar Pradesh, India
    1433.5×
  48. 48TonkRajasthan, India
    1423.5×
  49. 49BawānaDelhi, India
    1413.5×
  50. 50ChiguayanteBiobio, Chile
    1403.4×
  51. 51KhannaPunjab, India
    1373.3×
  52. 52San Pedro de la PazBiobio, Chile
    1343.3×
  53. 53Islamabadlow-cost sensorsIslamabad, Pakistan
    1343.3×
  54. 54ManamaManama, Bahrain
    1343.3×
  55. 54AnkleshwarGujarat, India
    1343.3×
  56. 56Puente AltoSantiago Metropolitan, Chile
    1323.2×
  57. 57BaddiHimachal Pradesh, India
    1293.1×
  58. 58Hacienda Santa FeJalisco, Mexico
    1293.1×
  59. 59SasarāmBihar, India
    1283.1×
  60. 60MangaluruKarnataka, India
    1273.1×
  61. 61NavalpattuTamil Nadu, India
    1243.0×
  62. 62LucknowUttar Pradesh, India
    1233.0×
  63. 63ValdiviaLos Ríos Region, Chile
    1222.9×
  64. 64PanvelMaharashtra, India
    1222.9×
  65. 65BhiwadiRajasthan, India
    1212.9×
  66. 66AjmerRajasthan, India
    1202.9×
  67. 67SingrauliMadhya Pradesh, India
    1202.9×
  68. 68DelhiDelhi, India
    1202.9×
  69. 69Dubailow-cost sensorsDubai, United Arab Emirates
    1182.8×
  70. 70BulandshahrUttar Pradesh, India
    1172.8×
  71. 71GhāziābādUttar Pradesh, India
    1172.8×
  72. 72RourkelaOdisha, India
    1162.8×
  73. 73TirupatiAndhra Pradesh, India
    1152.7×
  74. 74AnantapurAndhra Pradesh, India
    1152.7×
  75. 75GandhinagarGujarat, India
    1142.7×
  76. 75Dera MāndiDelhi, India
    1142.7×
  77. 77JaipurRajasthan, India
    1142.7×
  78. 78GobindgarhPunjab, India
    1142.7×
  79. 79NajafgarhDelhi, India
    1132.7×
  80. 80KadapaAndhra Pradesh, India
    1122.7×
  81. 81BhelaiChhattisgarh, India
    1112.6×
  82. 82DūngarpurRajasthan, India
    1082.6×
  83. 83AtlixcoPuebla, Mexico
    1062.5×
  84. 84Bang Bo DistrictSamut Prakan, Thailand
    1042.5×
  85. 85NaharlagunArunachal Pradesh, India
    1042.4×
  86. 86Puerto AysénAysén, Chile
    1032.4×
  87. 87KalyānMaharashtra, India
    1032.4×
  88. 88BadlapurMaharashtra, India
    1022.4×
  89. 89TiruchirappalliTamil Nadu, India
    1022.4×
  90. 89RasapūdipalemAndhra Pradesh, India
    1022.4×
  91. 89KotaRajasthan, India
    1022.4×
  92. 92NoidaUttar Pradesh, India
    1002.4×
  93. 93PatnaBihar, India
    1002.4×
  94. 94LimaLima Province, Peru
    992.3×
  95. 95SīkarRajasthan, India
    992.3×
  96. 95Ban Talat BuengChon Buri, Thailand
    992.3×
  97. 97BharatpurRajasthan, India
    992.3×
  98. 98QuilpuéValparaiso, Chile
    992.3×
  99. 99LotaBiobio, Chile
    982.3×
  100. 100MuzaffarpurBihar, India
    972.3×
  101. 101VelloreTamil Nadu, India
    972.3×
  102. 101CholulaPuebla, Mexico
    972.3×
  103. 103VijayawadaAndhra Pradesh, India
    962.2×
  104. 104KanpurUttar Pradesh, India
    962.2×
  105. 104Viña del MarValparaiso, Chile
    962.2×
  106. 106QuthbullapurTelangana, India
    962.2×
  107. 107KigaliKigali, Rwanda
    962.2×
  108. 108AntofagastaAntofagasta, Chile
    952.2×
  109. 109San Francisco De BorjaLima region, Peru
    952.2×
  110. 110HājīpurBihar, India
    952.2×
  111. 111HanumāngarhRajasthan, India
    942.2×
  112. 112JalandharPunjab, India
    942.2×
  113. 113PatiālaPunjab, India
    942.1×
  114. 113BhayandarMaharashtra, India
    942.1×
  115. 113UnderaGujarat, India
    942.1×
  116. 116UdaipurRajasthan, India
    932.1×
  117. 117Bihār SharīfBihar, India
    932.1×
  118. 118Ciudad NezahualcoyotlMéxico, Mexico
    932.1×
  119. 119JalgaonMaharashtra, India
    922.1×
  120. 120AnsfeldenUpper Austria, Austria
    922.1×
  121. 121GayaBihar, India
    922.1×
  122. 122DādriUttar Pradesh, India
    922.1×
  123. 122ChittorgarhRajasthan, India
    922.1×
  124. 124JhunjhunūnRajasthan, India
    912.0×
  125. 124MumbaiMaharashtra, India
    912.0×
  126. 126Kamojimachō-jōgejimaTokushima, Japan
    902.0×
  127. 126ConcónValparaiso, Chile
    902.0×
  128. 128HyderabadTelangana, India
    902.0×
  129. 129ĀsansolWest Bengal, India
    902.0×
  130. 130AmritsarPunjab, India
    892.0×
  131. 131JhānsiUttar Pradesh, India
    892.0×
  132. 132SuratGujarat, India
    881.9×
  133. 132Melbournelow-cost sensorsVictoria, Australia
    881.9×
  134. 132Mexico CityMexico City, Mexico
    881.9×
  135. 135ThrissurKerala, India
    881.9×
  136. 135BhilwaraRajasthan, India
    881.9×
  137. 137GwaliorMadhya Pradesh, India
    881.9×
  138. 138AlangadKerala, India
    881.9×
  139. 139Sawai MadhopurRajasthan, India
    871.9×
  140. 139ChūruRajasthan, India
    871.9×
  141. 141RānīganjWest Bengal, India
    871.9×
  142. 141AurangābādBihar, India
    871.9×
  143. 143QuinteroValparaiso, Chile
    871.9×
  144. 143PithampurMadhya Pradesh, India
    871.9×
  145. 145ChennaiTamil Nadu, India
    861.9×
  146. 146KalasinKalasin, Thailand
    861.9×
  147. 146GuadalajaraJalisco, Mexico
    861.9×
  148. 148Santa AnitaJalisco, Mexico
    861.9×
  149. 149MahādMaharashtra, India
    851.8×
  150. 149GuwahatiAssam, India
    851.8×
  151. 151AlwarRajasthan, India
    851.8×
  152. 152SiliguriWest Bengal, India
    851.8×
  153. 152DausaRajasthan, India
    851.8×
  154. 154AgraUttar Pradesh, India
    851.8×
  155. 155ChandigarhChandigarh, India
    841.8×
  156. 156Istanbullow-cost sensorsIstanbul, Turkey
    841.8×
  157. 157KohimaNagaland, India
    841.8×
  158. 157GummidipundiTamil Nadu, India
    841.8×
  159. 157CoimbatoreTamil Nadu, India
    841.8×
  160. 157Aya NagarDelhi, India
    841.8×
  161. 161AguascalientesAguascalientes, Mexico
    841.8×
  162. 162BhāgalpurBihar, India
    831.8×
  163. 163BūndiRajasthan, India
    831.7×
  164. 164Mixquiahuala de JuárezHidalgo, Mexico
    821.7×
  165. 164BelpaharOdisha, India
    821.7×
  166. 164Wadgaon KolhatiMaharashtra, India
    821.7×
  167. 167KanchipuramTamil Nadu, India
    821.7×
  168. 168NeelankaraiTamil Nadu, India
    821.7×
  169. 169TehuacánPuebla, Mexico
    821.7×
  170. 169ZapopanJalisco, Mexico
    821.7×
  171. 171JalorRajasthan, India
    821.7×
  172. 172Ban ChangRayong, Thailand
    811.7×
  173. 172Tepeji del Río de OcampoHidalgo, Mexico
    811.7×
  174. 174SilcharAssam, India
    811.7×
  175. 175Bang NaBangkok, Thailand
    811.7×
  176. 176Pachuca de SotoHidalgo, Mexico
    811.7×
  177. 177NashikMaharashtra, India
    801.7×
  178. 177GorakhpurUttar Pradesh, India
    801.7×
  179. 177Naucalpan de JuárezMéxico, Mexico
    801.7×
  180. 177Ciudad Benito JuárezNuevo León, Mexico
    801.7×
  181. 181CoquimboCoquimbo Region, Chile
    801.7×
  182. 182PurniaBihar, India
    801.6×
  183. 182DehradunUttarakhand, India
    801.6×
  184. 182Amnat CharoenAmnat Charoen, Thailand
    801.6×
  185. 182TulancingoHidalgo, Mexico
    801.6×
  186. 186BānswāraRajasthan, India
    801.6×
  187. 187TirumalaAndhra Pradesh, India
    801.6×
  188. 187BikanerRajasthan, India
    801.6×
  189. 187TepicNayarit, Mexico
    801.6×
  190. 190AricaArica y Parinacota Region, Chile
    791.6×
  191. 191KalaburagiKarnataka, India
    791.6×
  192. 191CallaoCallao, Peru
    791.6×
  193. 191Ciudad JuárezChihuahua, Mexico
    791.6×
  194. 194NandriRajasthan, India
    791.6×
  195. 195JodhpurRajasthan, India
    791.6×
  196. 196BengaluruKarnataka, India
    781.6×
  197. 196SantyokuGangwon-do, South Korea
    781.6×
  198. 198CheorwonGangwon-do, South Korea
    781.6×
  199. 199PueblaPuebla, Mexico
    781.6×
  200. 199TlaxcalaTlaxcala, Mexico
    781.6×

Top 200 of 2,688 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

Not covered: the government monitoring networks of China and Turkey, which publish no terms that let us reuse their readings. Most cities there are missing from this board, not clean. Why.

Use this board

SmogRank, most polluted cities, PM2.5, May 23, 2025, smogrank.com/history/2025-05-23 (accessed 3 Oct 2026).

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