SmogRank / History / April 21, 2025

Most polluted cities on April 21, 2025

2,621 cities ranked by their average PM2.5 over the day; the worst was Singrauli, India, at 115.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during April 21, 2025. All episodes.

← Singrauli 115.0 µg/m³ 100 µg/m³15 WHO 24-hour guideline
Every city ranked for April 21, 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. 1SingrauliMadhya Pradesh, India
    1937.7×
  2. 2Ubon RatchathaniUbon Ratchathani, Thailand
    1887.2×
  3. 3BegusaraiBihar, India
    1846.9×
  4. 4LoniUttar Pradesh, India
    1806.5×
  5. 5SasarāmBihar, India
    1796.4×
  6. 6NarelaDelhi, India
    1756.0×
  7. 7AurangābādBihar, India
    1745.9×
  8. 8MuzaffarnagarUttar Pradesh, India
    1745.9×
  9. 9Dera MāndiDelhi, India
    1715.6×
  10. 10BawānaDelhi, India
    1705.5×
  11. 11GayaBihar, India
    1695.4×
  12. 12LucknowUttar Pradesh, India
    1685.3×
  13. 13GhāziābādUttar Pradesh, India
    1665.1×
  14. 14BhiwadiRajasthan, India
    1665.1×
  15. 15PāliRajasthan, India
    1665.1×
  16. 16BhelaiChhattisgarh, India
    1644.9×
  17. 17MalegaonMaharashtra, India
    1634.9×
  18. 18Sri GanganagarRajasthan, India
    1634.9×
  19. 19UdaipurRajasthan, India
    1634.8×
  20. 20DelhiDelhi, India
    1634.8×
  21. 20BhāgalpurBihar, India
    1634.8×
  22. 22PatnaBihar, India
    1624.7×
  23. 23ChittorgarhRajasthan, India
    1614.6×
  24. 24RourkelaOdisha, India
    1604.5×
  25. 25GorakhpurUttar Pradesh, India
    1594.4×
  26. 26BulandshahrUttar Pradesh, India
    1584.4×
  27. 27AjmerRajasthan, India
    1574.3×
  28. 28TirupatiAndhra Pradesh, India
    1574.2×
  29. 29LinaresMaule Region, Chile
    1564.2×
  30. 30AhmedabadGujarat, India
    1564.2×
  31. 31SaugorMadhya Pradesh, India
    1554.1×
  32. 32DausaRajasthan, India
    1554.1×
  33. 33Sawai MadhopurRajasthan, India
    1554.0×
  34. 34CoyhaiqueAysén, Chile
    1554.0×
  35. 34JodaOdisha, India
    1554.0×
  36. 36VillarricaAraucania, Chile
    1544.0×
  37. 37NacimientoBiobio, Chile
    1544.0×
  38. 38NajafgarhDelhi, India
    1533.9×
  39. 38Aya NagarDelhi, India
    1533.9×
  40. 40PatiālaPunjab, India
    1533.9×
  41. 41LudhianaPunjab, India
    1533.9×
  42. 42JalgaonMaharashtra, India
    1523.8×
  43. 43TirupparangunramTamil Nadu, India
    1513.7×
  44. 43AlwarRajasthan, India
    1513.7×
  45. 43PithampurMadhya Pradesh, India
    1513.7×
  46. 46JaipurRajasthan, India
    1513.7×
  47. 47GwaliorMadhya Pradesh, India
    1503.7×
  48. 48DhuleMaharashtra, India
    1493.7×
  49. 48DewasMadhya Pradesh, India
    1493.7×
  50. 48YasothonYasothon, Thailand
    1493.7×
  51. 51PrayagrajUttar Pradesh, India
    1493.7×
  52. 52ChāndaMaharashtra, India
    1483.6×
  53. 53DādriUttar Pradesh, India
    1483.6×
  54. 54DamohMadhya Pradesh, India
    1423.5×
  55. 55AmritsarPunjab, India
    1423.5×
  56. 56RatlāmMadhya Pradesh, India
    1413.5×
  57. 57ChillánÑuble, Chile
    1383.4×
  58. 58TirumalaAndhra Pradesh, India
    1383.4×
  59. 59BārānRajasthan, India
    1373.4×
  60. 60Amnat CharoenAmnat Charoen, Thailand
    1373.3×
  61. 61NoidaUttar Pradesh, India
    1353.3×
  62. 62JhālāwārRajasthan, India
    1353.3×
  63. 63ChittoorAndhra Pradesh, India
    1353.3×
  64. 63BilāspurChhattisgarh, India
    1353.3×
  65. 65MandideepMadhya Pradesh, India
    1343.3×
  66. 66San CarlosÑuble, Chile
    1333.2×
  67. 67PurniaBihar, India
    1323.2×
  68. 68HualpénBiobio, Chile
    1313.2×
  69. 69BhilwaraRajasthan, India
    1303.2×
  70. 70NagpurMaharashtra, India
    1303.1×
  71. 71LaturMaharashtra, India
    1293.1×
  72. 71KanpurUttar Pradesh, India
    1293.1×
  73. 73Islamabadlow-cost sensorsIslamabad, Pakistan
    1283.1×
  74. 74MohaliPunjab, India
    1283.1×
  75. 75VijayawadaAndhra Pradesh, India
    1273.1×
  76. 75ChandigarhChandigarh, India
    1273.1×
  77. 77Roi EtRoi Et, Thailand
    1273.1×
  78. 78RajākheriMadhya Pradesh, India
    1263.0×
  79. 79AngulOdisha, India
    1263.0×
  80. 80JalandharPunjab, India
    1263.0×
  81. 81TehuacánPuebla, Mexico
    1253.0×
  82. 82Los ÁngelesBiobio, Chile
    1243.0×
  83. 83SamāstipurBihar, India
    1233.0×
  84. 84TiruchirappalliTamil Nadu, India
    1233.0×
  85. 84AkolaMaharashtra, India
    1233.0×
  86. 86RasapūdipalemAndhra Pradesh, India
    1222.9×
  87. 87AnantapurAndhra Pradesh, India
    1222.9×
  88. 88JodhpurRajasthan, India
    1212.9×
  89. 88TemucoAraucania, Chile
    1212.9×
  90. 88BarbilOdisha, India
    1212.9×
  91. 91ĀsansolWest Bengal, India
    1212.9×
  92. 91PhichitPhichit, Thailand
    1212.9×
  93. 93DehradunUttarakhand, India
    1212.9×
  94. 94CuttackOdisha, India
    1202.9×
  95. 95ChūruRajasthan, India
    1202.9×
  96. 96NashikMaharashtra, India
    1192.9×
  97. 97SalemTamil Nadu, India
    1182.8×
  98. 97BhopalMadhya Pradesh, India
    1182.8×
  99. 97BānswāraRajasthan, India
    1182.8×
  100. 100VelloreTamil Nadu, India
    1182.8×
  101. 101KeonjhargarhOdisha, India
    1182.8×
  102. 102NeelankaraiTamil Nadu, India
    1172.8×
  103. 103BharatpurRajasthan, India
    1172.8×
  104. 104KhannaPunjab, India
    1172.8×
  105. 104JhunjhunūnRajasthan, India
    1172.8×
  106. 106SāngliMaharashtra, India
    1162.8×
  107. 107BuxarBihar, India
    1162.8×
  108. 108BaripādaOdisha, India
    1142.7×
  109. 108Victoria de DurangoDurango, Mexico
    1142.7×
  110. 110CoronelBiobio, Chile
    1142.7×
  111. 111SaharsaBihar, India
    1132.7×
  112. 111MeerutUttar Pradesh, India
    1132.7×
  113. 113PanvelMaharashtra, India
    1132.7×
  114. 114AurangabadMaharashtra, India
    1122.7×
  115. 115JhānsiUttar Pradesh, India
    1122.7×
  116. 115ArāriaBihar, India
    1122.7×
  117. 115CholulaPuebla, Mexico
    1122.7×
  118. 118Istanbullow-cost sensorsIstanbul, Turkey
    1122.7×
  119. 119BadlapurMaharashtra, India
    1112.6×
  120. 119AgraUttar Pradesh, India
    1112.6×
  121. 121TalcahuanoBiobio, Chile
    1102.6×
  122. 122VaranasiUttar Pradesh, India
    1092.6×
  123. 122AmravatiMaharashtra, India
    1092.6×
  124. 124PatancheruTelangana, India
    1092.6×
  125. 124TlaquepaqueJalisco, Mexico
    1092.6×
  126. 126KadapaAndhra Pradesh, India
    1082.6×
  127. 127BhiwandiMaharashtra, India
    1082.6×
  128. 128SholapurMaharashtra, India
    1082.6×
  129. 128ToméBiobio, Chile
    1082.6×
  130. 130KalasinKalasin, Thailand
    1082.5×
  131. 131KohimaNagaland, India
    1072.5×
  132. 132Ciudad NezahualcoyotlMéxico, Mexico
    1062.5×
  133. 133PuneMaharashtra, India
    1062.5×
  134. 134Dubailow-cost sensorsDubai, United Arab Emirates
    1062.5×
  135. 135PratāpgarhRajasthan, India
    1062.5×
  136. 136TalcaMaule Region, Chile
    1052.5×
  137. 136Dera Colliery TownshipOdisha, India
    1052.5×
  138. 138RishīkeshUttarakhand, India
    1052.5×
  139. 139Puerto AysénAysén, Chile
    1032.4×
  140. 140KotaRajasthan, India
    1032.4×
  141. 141MahādMaharashtra, India
    1022.4×
  142. 142ByasanagarOdisha, India
    1022.4×
  143. 143DindigulTamil Nadu, India
    1022.4×
  144. 143CuranilahueBiobio, Chile
    1022.4×
  145. 145TonkRajasthan, India
    1012.4×
  146. 146BūndiRajasthan, India
    1002.4×
  147. 147HāpurUttar Pradesh, India
    1002.4×
  148. 148AlangadKerala, India
    992.3×
  149. 149KanchipuramTamil Nadu, India
    992.3×
  150. 149Tepeji del Río de OcampoHidalgo, Mexico
    992.3×
  151. 151RānīganjWest Bengal, India
    992.3×
  152. 152JalorRajasthan, India
    982.3×
  153. 153KigaliKigali, Rwanda
    982.3×
  154. 153MangaluruKarnataka, India
    982.3×
  155. 155MukdahanMukdahan, Thailand
    982.3×
  156. 155Mixquiahuala de JuárezHidalgo, Mexico
    982.3×
  157. 157ThāneMaharashtra, India
    972.3×
  158. 157KhargharMaharashtra, India
    972.3×
  159. 159SerilingampalleTelangana, India
    972.3×
  160. 159AmaravatiAndhra Pradesh, India
    972.3×
  161. 161BārmerRajasthan, India
    972.2×
  162. 161IrapuatoGuanajuato, Mexico
    972.2×
  163. 163AguascalientesAguascalientes, Mexico
    962.2×
  164. 164BettiahBihar, India
    962.2×
  165. 165SukhothaiSukhothai, Thailand
    962.2×
  166. 165CuricóMaule Region, Chile
    962.2×
  167. 167SantiagoSantiago Metropolitan, Chile
    962.2×
  168. 168MungerBihar, India
    952.2×
  169. 168Lop BuriLopburi, Thailand
    952.2×
  170. 170CallaoCallao, Peru
    952.2×
  171. 171QuillotaValparaiso, Chile
    942.2×
  172. 172MorādābādUttar Pradesh, India
    942.1×
  173. 173IndoreMadhya Pradesh, India
    942.1×
  174. 173Chrang Chamreh Muoylow-cost sensorsPhnom Penh, Cambodia
    942.1×
  175. 175PueblaPuebla, Mexico
    932.1×
  176. 175León de los AldamaGuanajuato, Mexico
    932.1×
  177. 177Mexico CityMexico City, Mexico
    932.1×
  178. 178NāgaurRajasthan, India
    932.1×
  179. 179Vientianelow-cost sensorsVientiane Prefecture, Laos
    922.1×
  180. 180DhaulpurRajasthan, India
    922.1×
  181. 181ShenyangLiaoning, China
    922.1×
  182. 182SangāreddiTelangana, India
    922.1×
  183. 182Gadag-BetageriKarnataka, India
    922.1×
  184. 184RengoO'Higgins Region, Chile
    912.1×
  185. 185SirohiRajasthan, India
    912.0×
  186. 185ShrīrāmpurWest Bengal, India
    912.0×
  187. 185GummidipundiTamil Nadu, India
    912.0×
  188. 188Chik BallāpurKarnataka, India
    912.0×
  189. 189KatiharBihar, India
    902.0×
  190. 190TuxtlaChiapas, Mexico
    902.0×
  191. 191HyderabadTelangana, India
    902.0×
  192. 191BhilaiChhattisgarh, India
    902.0×
  193. 193TalaganteSantiago Metropolitan, Chile
    902.0×
  194. 194BathindaPunjab, India
    902.0×
  195. 195NalbāriAssam, India
    892.0×
  196. 196KalyānMaharashtra, India
    892.0×
  197. 196DūngarpurRajasthan, India
    892.0×
  198. 196Khon KaenKhon Kaen, Thailand
    892.0×
  199. 196Puente AltoSantiago Metropolitan, Chile
    892.0×
  200. 196Hacienda Santa FeJalisco, Mexico
    892.0×

Top 200 of 2,621 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, April 21, 2025, smogrank.com/history/2025-04-21 (accessed 2 Oct 2026).

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