SmogRank / History / May 25, 2025

Most polluted cities on May 25, 2025

2,592 cities ranked by their average PM2.5 over the day; the worst was Cuddalore, India, at 753.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during May 25, 2025. All episodes.

← Cuddalore 753.0 µg/m³ 700 µg/m³15 WHO 24-hour guideline
Every city ranked for May 25, 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. 1CuddaloreTamil Nadu, India
    500+50.2×
  2. 2BārmerRajasthan, India
    38217.7×
  3. 3JodhpurRajasthan, India
    23710.8×
  4. 4NāgaurRajasthan, India
    1816.5×
  5. 5CoyhaiqueAysén, Chile
    1796.4×
  6. 6CuricóMaule Region, Chile
    1786.3×
  7. 7TalcahuanoBiobio, Chile
    1766.1×
  8. 8Wadgaon KolhatiMaharashtra, India
    1735.8×
  9. 9DushanbeDushanbe, Tajikistan
    1715.6×
  10. 10HualpénBiobio, Chile
    1705.5×
  11. 11CuranilahueBiobio, Chile
    1685.3×
  12. 12TalaganteSantiago Metropolitan, Chile
    1644.9×
  13. 13MandideepMadhya Pradesh, India
    1634.8×
  14. 14Puerto AysénAysén, Chile
    1624.7×
  15. 15KotaRajasthan, India
    1604.6×
  16. 16PāliRajasthan, India
    1574.3×
  17. 17NacimientoBiobio, Chile
    1574.2×
  18. 18SantiagoSantiago Metropolitan, Chile
    1564.2×
  19. 19Santa Anita - Los FicusLima region, Peru
    1554.1×
  20. 20RengoO'Higgins Region, Chile
    1554.1×
  21. 21JaipurRajasthan, India
    1493.7×
  22. 22BelpaharOdisha, India
    1473.6×
  23. 23BhelaiChhattisgarh, India
    1423.5×
  24. 24LucknowUttar Pradesh, India
    1353.3×
  25. 25KigaliKigali, Rwanda
    1353.3×
  26. 26VapiGujarat, India
    1343.3×
  27. 27ManamaManama, Bahrain
    1323.2×
  28. 28ConcónValparaiso, Chile
    1313.2×
  29. 29KalyānMaharashtra, India
    1293.1×
  30. 29AhmedabadGujarat, India
    1293.1×
  31. 31RancaguaO'Higgins Region, Chile
    1283.1×
  32. 32PithampurMadhya Pradesh, India
    1273.1×
  33. 33JakartaJakarta, Indonesia
    1273.1×
  34. 34ValdiviaLos Ríos Region, Chile
    1263.0×
  35. 34CoronelBiobio, Chile
    1263.0×
  36. 36BikanerRajasthan, India
    1253.0×
  37. 37LinaresMaule Region, Chile
    1233.0×
  38. 38Hacienda Santa FeJalisco, Mexico
    1202.9×
  39. 39TalcaMaule Region, Chile
    1202.9×
  40. 40Puente AltoSantiago Metropolitan, Chile
    1192.9×
  41. 41GūduvāncheriTamil Nadu, India
    1172.8×
  42. 42QuinteroValparaiso, Chile
    1162.8×
  43. 43GandhinagarGujarat, India
    1162.8×
  44. 44AnantapurAndhra Pradesh, India
    1142.7×
  45. 45QuilpuéValparaiso, Chile
    1122.7×
  46. 45OsornoLos Lagos Region, Chile
    1122.7×
  47. 45HualquiBiobio, Chile
    1122.7×
  48. 48AjmerRajasthan, India
    1112.6×
  49. 49Dubailow-cost sensorsDubai, United Arab Emirates
    1102.6×
  50. 50KanpurUttar Pradesh, India
    1092.6×
  51. 51VijayawadaAndhra Pradesh, India
    1072.5×
  52. 52NashikMaharashtra, India
    1062.5×
  53. 52ToméBiobio, Chile
    1062.5×
  54. 54TemucoAraucania, Chile
    1042.4×
  55. 54San Pedro de la PazBiobio, Chile
    1042.4×
  56. 56Viña del MarValparaiso, Chile
    1032.4×
  57. 57TirupatiAndhra Pradesh, India
    1032.4×
  58. 58PuneMaharashtra, India
    1022.4×
  59. 59Ban Talat BuengChon Buri, Thailand
    1022.4×
  60. 60ConcepciónBiobio, Chile
    1012.4×
  61. 61GorakhpurUttar Pradesh, India
    992.3×
  62. 62TocopillaAntofagasta, Chile
    992.3×
  63. 62ChiguayanteBiobio, Chile
    992.3×
  64. 64San CarlosÑuble, Chile
    982.3×
  65. 65ChillánÑuble, Chile
    982.3×
  66. 66AnkleshwarGujarat, India
    972.2×
  67. 67JinchengFukien, Taiwan
    962.2×
  68. 68TlaquepaqueJalisco, Mexico
    962.2×
  69. 69VillarricaAraucania, Chile
    952.2×
  70. 70GayaBihar, India
    952.2×
  71. 70Los ÁngelesBiobio, Chile
    952.2×
  72. 70UnderaGujarat, India
    952.2×
  73. 73GuangzhouGuangdong, China
    942.2×
  74. 74DūngarpurRajasthan, India
    932.1×
  75. 75AshgabatAshgabat, Turkmenistan
    912.1×
  76. 76León de los AldamaGuanajuato, Mexico
    902.0×
  77. 77KanchipuramTamil Nadu, India
    902.0×
  78. 78Tuen MunTuen Mun, Hong Kong
    902.0×
  79. 79AthensAttica, Greece
    892.0×
  80. 79La UniónLos Ríos Region, Chile
    892.0×
  81. 81La SerenaCoquimbo Region, Chile
    881.9×
  82. 81CoquimboCoquimbo Region, Chile
    881.9×
  83. 83BawānaDelhi, India
    881.9×
  84. 84AgraUttar Pradesh, India
    881.9×
  85. 84San Francisco De BorjaLima region, Peru
    881.9×
  86. 86Wan ChaiWan Chai, Hong Kong
    871.9×
  87. 87BhopalMadhya Pradesh, India
    871.9×
  88. 88West FargoNorth Dakota, United States
    871.9×
  89. 89AntofagastaAntofagasta, Chile
    861.9×
  90. 90SingrauliMadhya Pradesh, India
    851.8×
  91. 91Tin Shui WaiYuen Long, Hong Kong
    851.8×
  92. 92PirotCentral Serbia, Serbia
    851.8×
  93. 92GwaliorMadhya Pradesh, India
    851.8×
  94. 92AlangadKerala, India
    851.8×
  95. 95RasapūdipalemAndhra Pradesh, India
    841.8×
  96. 95DamohMadhya Pradesh, India
    841.8×
  97. 95CauquenesMaule Region, Chile
    841.8×
  98. 98FanlingNorth District, Hong Kong
    841.8×
  99. 99PiraeusAttica, Greece
    831.8×
  100. 99SāngliMaharashtra, India
    831.8×
  101. 99JalgaonMaharashtra, India
    831.8×
  102. 102Istanbullow-cost sensorsIstanbul, Turkey
    831.8×
  103. 103PrayagrajUttar Pradesh, India
    831.7×
  104. 103Almatylow-cost sensorsAlmaty, Kazakhstan
    831.7×
  105. 105Puerto MonttLos Lagos Region, Chile
    831.7×
  106. 105RajākheriMadhya Pradesh, India
    831.7×
  107. 107Pimpri-ChinchwadMaharashtra, India
    821.7×
  108. 108HyderabadTelangana, India
    821.7×
  109. 109Dera Colliery TownshipOdisha, India
    821.7×
  110. 110KhalándrionAttica, Greece
    821.7×
  111. 111Bang Bo DistrictSamut Prakan, Thailand
    811.7×
  112. 112Islamabadlow-cost sensorsIslamabad, Pakistan
    811.7×
  113. 112Khon KaenKhon Kaen, Thailand
    811.7×
  114. 114DelhiDelhi, India
    801.7×
  115. 115AcharnésAttica, Greece
    801.6×
  116. 115San Tung Chung HangIslands, Hong Kong
    801.6×
  117. 117Tai PoTai Po, Hong Kong
    801.6×
  118. 118PatnaBihar, India
    791.6×
  119. 118BhilwaraRajasthan, India
    791.6×
  120. 120PratāpgarhRajasthan, India
    791.6×
  121. 121Mixquiahuala de JuárezHidalgo, Mexico
    781.6×
  122. 122XizhiTaipei, Taiwan
    781.6×
  123. 123Ciudad JuárezChihuahua, Mexico
    781.6×
  124. 123BhiwadiRajasthan, India
    781.6×
  125. 125ChennaiTamil Nadu, India
    771.6×
  126. 126AsprópyrgosAttica, Greece
    771.5×
  127. 126AlwarRajasthan, India
    771.5×
  128. 128TimaruCanterbury, New Zealand
    771.5×
  129. 129Victoria de DurangoDurango, Mexico
    771.5×
  130. 130RairangpurOdisha, India
    761.5×
  131. 130Kwai ChungKwai Tsing District, Hong Kong
    761.5×
  132. 130Ciudad Benito JuárezNuevo León, Mexico
    761.5×
  133. 133IndoreMadhya Pradesh, India
    761.5×
  134. 134TaipeiTaiwan, Taiwan
    761.5×
  135. 135ShenyangLiaoning, China
    761.5×
  136. 136KeelungTaiwan, Taiwan
    751.5×
  137. 137AnsfeldenUpper Austria, Austria
    751.5×
  138. 137New Taipei CityTaipei, Taiwan
    751.5×
  139. 139BūndiRajasthan, India
    751.5×
  140. 139MumbaiMaharashtra, India
    751.5×
  141. 141GuadalajaraJalisco, Mexico
    751.5×
  142. 142Sham Shui PoSham Shui Po District, Hong Kong
    751.5×
  143. 143MuzaffarpurBihar, India
    741.4×
  144. 143VijayapuraKarnataka, India
    741.4×
  145. 143Khlong LuangPathum Thani, Thailand
    741.4×
  146. 146SuratGujarat, India
    741.4×
  147. 147DaxiTaiwan, Taiwan
    741.4×
  148. 147Sau Mau PingKwun Tong District, Hong Kong
    741.4×
  149. 147Mong KokYau Tsim Mong District, Hong Kong
    741.4×
  150. 147MéridaYucatán, Mexico
    741.4×
  151. 147AricaArica y Parinacota Region, Chile
    741.4×
  152. 152Bang NaBangkok, Thailand
    741.4×
  153. 152TaoyuanTaiwan, Taiwan
    741.4×
  154. 154NeiliTaiwan, Taiwan
    731.4×
  155. 154Tsuen WanTsuen Wan, Hong Kong
    731.4×
  156. 156ZhubeiTaiwan, Taiwan
    731.4×
  157. 156Sha TinSha Tin, Hong Kong
    731.4×
  158. 158KalasinKalasin, Thailand
    731.4×
  159. 159BhubaneswarOdisha, India
    721.4×
  160. 159AmritsarPunjab, India
    721.4×
  161. 159AmravatiMaharashtra, India
    721.4×
  162. 162NarelaDelhi, India
    721.4×
  163. 162ZapopanJalisco, Mexico
    721.4×
  164. 164Brownsvillelow-cost sensorsTexas, United States
    721.4×
  165. 165ToufenTaiwan, Taiwan
    711.3×
  166. 166Corpus ChristiTexas, United States
    711.3×
  167. 167Santa AnitaJalisco, Mexico
    711.3×
  168. 168NairobiNairobi County, Kenya
    711.3×
  169. 168GummidipundiTamil Nadu, India
    711.3×
  170. 168HsinchuTaiwan, Taiwan
    711.3×
  171. 168AguascalientesAguascalientes, Mexico
    711.3×
  172. 172TepicNayarit, Mexico
    711.3×
  173. 173MonterreyNuevo León, Mexico
    711.3×
  174. 174YongkangTaiwan, Taiwan
    701.3×
  175. 174VictoriaCentral and Western, Hong Kong
    701.3×
  176. 176Tepeji del Río de OcampoHidalgo, Mexico
    701.3×
  177. 176NoidaUttar Pradesh, India
    701.3×
  178. 178JhunjhunūnRajasthan, India
    701.3×
  179. 178EdinburgTexas, United States
    701.3×
  180. 180CopiapóAtacama, Chile
    701.3×
  181. 181BulandshahrUttar Pradesh, India
    701.3×
  182. 181AngulOdisha, India
    701.3×
  183. 183KaliszGreater Poland, Poland
    691.3×
  184. 184SilcharAssam, India
    691.3×
  185. 185Shakaskraallow-cost sensorsKwaZulu-Natal, South Africa
    691.3×
  186. 186LotaBiobio, Chile
    691.2×
  187. 187CallaoCallao, Peru
    691.2×
  188. 187GuanajuatoGuanajuato, Mexico
    691.2×
  189. 187Saint PaulMinnesota, United States
    691.2×
  190. 190VirārMaharashtra, India
    681.2×
  191. 190MinneapolisMinnesota, United States
    681.2×
  192. 192Sing BuriSing Buri, Thailand
    671.2×
  193. 193YasothonYasothon, Thailand
    671.2×
  194. 193Nong Bua LamphuNong Bua Lamphu, Thailand
    671.2×
  195. 195ShakopeeMinnesota, United States
    671.2×
  196. 196AurangabadMaharashtra, India
    671.2×
  197. 196YilanTaiwan, Taiwan
    671.2×
  198. 196MissionTexas, United States
    671.2×
  199. 199MagongTaiwan, Taiwan
    671.2×
  200. 199Le LamentinMartinique, Martinique
    671.2×

Top 200 of 2,592 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 25, 2025, smogrank.com/history/2025-05-25 (accessed 2 Oct 2026).

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