SmogRank / History / April 4, 2025

Most polluted cities on April 4, 2025

2,699 cities ranked by their average PM2.5 over the day; the worst was Cuddalore, India, at 488.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during April 4, 2025. All episodes.

← Cuddalore 488.0 µg/m³ 400 µg/m³15 WHO 24-hour guideline
Every city ranked for April 4, 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+32.5×
  2. 2LoniUttar Pradesh, India
    34616.5×
  3. 3DādriUttar Pradesh, India
    27113.1×
  4. 4GhāziābādUttar Pradesh, India
    2119.1×
  5. 5SiliguriWest Bengal, India
    1937.7×
  6. 6BawānaDelhi, India
    1907.4×
  7. 7KoppalKarnataka, India
    1867.1×
  8. 8TiruppurTamil Nadu, India
    1856.9×
  9. 10HājīpurBihar, India
    1846.8×
  10. 11GuwahatiAssam, India
    1836.7×
  11. 12CoyhaiqueAysén, Chile
    1836.7×
  12. 13NarelaDelhi, India
    1806.5×
  13. 14NanNan, Thailand
    1756.0×
  14. 16RourkelaOdisha, India
    1725.7×
  15. 17Aya NagarDelhi, India
    1715.6×
  16. 18SasarāmBihar, India
    1695.4×
  17. 19NalbāriAssam, India
    1695.4×
  18. 20Bihār SharīfBihar, India
    1695.4×
  19. 21AnkleshwarGujarat, India
    1685.3×
  20. 22GangtokSikkim, India
    1685.3×
  21. 23BāghpatUttar Pradesh, India
    1675.3×
  22. 24Mae SaiChiang Rai, Thailand
    1665.1×
  23. 25SiwānBihar, India
    1644.9×
  24. 25NajafgarhDelhi, India
    1644.9×
  25. 27Chiang RaiChiang Rai, Thailand
    1644.9×
  26. 27PāliRajasthan, India
    1644.9×
  27. 27Chai NatChai Nat, Thailand
    1644.9×
  28. 30DelhiDelhi, India
    1634.9×
  29. 31BegusaraiBihar, India
    1634.8×
  30. 31GobindgarhPunjab, India
    1634.8×
  31. 33LoeiLoei, Thailand
    1624.8×
  32. 34LucknowUttar Pradesh, India
    1624.8×
  33. 35PithampurMadhya Pradesh, India
    1624.7×
  34. 36DewasMadhya Pradesh, India
    1614.6×
  35. 37AngulOdisha, India
    1604.6×
  36. 38JhānsiUttar Pradesh, India
    1604.5×
  37. 39BulandshahrUttar Pradesh, India
    1594.5×
  38. 40AurangābādBihar, India
    1594.5×
  39. 41Roi EtRoi Et, Thailand
    1594.4×
  40. 42PhayaoPhayao, Thailand
    1594.4×
  41. 43SingrauliMadhya Pradesh, India
    1594.4×
  42. 44BhiwadiRajasthan, India
    1584.4×
  43. 45KohimaNagaland, India
    1584.4×
  44. 45Dera Colliery TownshipOdisha, India
    1584.4×
  45. 47PhraePhrae, Thailand
    1574.3×
  46. 48PatnaBihar, India
    1574.3×
  47. 49Sawai MadhopurRajasthan, India
    1574.2×
  48. 49RoparPunjab, India
    1574.2×
  49. 51SangāreddiTelangana, India
    1574.2×
  50. 51NashikMaharashtra, India
    1574.2×
  51. 53Nakhon SawanNakhon Sawan, Thailand
    1564.2×
  52. 54ĀsansolWest Bengal, India
    1564.1×
  53. 55RairangpurOdisha, India
    1554.0×
  54. 56RānipetTamil Nadu, India
    1543.9×
  55. 56BānswāraRajasthan, India
    1543.9×
  56. 58PurniaBihar, India
    1533.9×
  57. 59Dera MāndiDelhi, India
    1523.8×
  58. 60Khon KaenKhon Kaen, Thailand
    1523.8×
  59. 61SāngliMaharashtra, India
    1523.8×
  60. 61LudhianaPunjab, India
    1523.8×
  61. 63RājgīrBihar, India
    1523.8×
  62. 63KalasinKalasin, Thailand
    1523.8×
  63. 65RānīganjWest Bengal, India
    1523.8×
  64. 66NagpurMaharashtra, India
    1513.7×
  65. 67YasothonYasothon, Thailand
    1513.7×
  66. 68Victoria de DurangoDurango, Mexico
    1513.7×
  67. 69Chiang MaiChiang Mai, Thailand
    1513.7×
  68. 70MalegaonMaharashtra, India
    1493.7×
  69. 71Kamphaeng PhetKamphaeng Phet, Thailand
    1473.6×
  70. 72DurgapurWest Bengal, India
    1473.6×
  71. 72Buri RamBuriram, Thailand
    1473.6×
  72. 74PhichitPhichit, Thailand
    1473.6×
  73. 75GandhinagarGujarat, India
    1463.6×
  74. 76BarbilOdisha, India
    1463.6×
  75. 77SukhothaiSukhothai, Thailand
    1453.5×
  76. 78KrotoszynGreater Poland, Poland
    1443.5×
  77. 79AhmedabadGujarat, India
    1443.5×
  78. 80NaharlagunArunachal Pradesh, India
    1433.5×
  79. 81Nakhon RatchasimaNakhon Ratchasima, Thailand
    1433.5×
  80. 82IndoreMadhya Pradesh, India
    1423.5×
  81. 82ChittorgarhRajasthan, India
    1423.5×
  82. 84KhargharMaharashtra, India
    1423.5×
  83. 85PanvelMaharashtra, India
    1413.5×
  84. 86UttaraditUttaradit, Thailand
    1403.4×
  85. 87Maha SarakhamMaha Sarakham, Thailand
    1393.4×
  86. 88MuzaffarnagarUttar Pradesh, India
    1393.4×
  87. 89PhetchabunPhetchabun, Thailand
    1393.4×
  88. 90Nong Bua LamphuNong Bua Lamphu, Thailand
    1383.4×
  89. 91ChandigarhChandigarh, India
    1373.4×
  90. 92HanumāngarhRajasthan, India
    1373.3×
  91. 93Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    1373.3×
  92. 94ShrīrāmpurWest Bengal, India
    1363.3×
  93. 94Jastrzębie ZdrójSilesia, Poland
    1363.3×
  94. 96LamphunLamphun, Thailand
    1363.3×
  95. 97MahādMaharashtra, India
    1353.3×
  96. 97JodhpurRajasthan, India
    1353.3×
  97. 99ZaječarCentral Serbia, Serbia
    1353.3×
  98. 99SurinSurin, Thailand
    1353.3×
  99. 101BhilwaraRajasthan, India
    1343.3×
  100. 102ChaiyaphumChaiyaphum, Thailand
    1343.3×
  101. 103VapiGujarat, India
    1343.3×
  102. 104Sing BuriSing Buri, Thailand
    1333.2×
  103. 105JaipurRajasthan, India
    1323.2×
  104. 105Ubon RatchathaniUbon Ratchathani, Thailand
    1323.2×
  105. 107MeerutUttar Pradesh, India
    1323.2×
  106. 108MungerBihar, India
    1323.2×
  107. 109Islamabadlow-cost sensorsIslamabad, Pakistan
    1313.2×
  108. 109PratāpgarhRajasthan, India
    1313.2×
  109. 109Udon ThaniUdon Thani, Thailand
    1313.2×
  110. 112Kinshasalow-cost sensorsKinshasa, Democratic Republic of the Congo
    1313.2×
  111. 113MuzaffarpurBihar, India
    1303.1×
  112. 113AjmerRajasthan, India
    1303.1×
  113. 115ThāneMaharashtra, India
    1283.1×
  114. 115BaripādaOdisha, India
    1283.1×
  115. 117JaisalmerRajasthan, India
    1283.1×
  116. 118RatlāmMadhya Pradesh, India
    1283.1×
  117. 119ByasanagarOdisha, India
    1273.1×
  118. 120KolkataWest Bengal, India
    1273.1×
  119. 121KalyānMaharashtra, India
    1253.0×
  120. 121JhālāwārRajasthan, India
    1253.0×
  121. 123KotaRajasthan, India
    1253.0×
  122. 124VijayawadaAndhra Pradesh, India
    1253.0×
  123. 125MohaliPunjab, India
    1233.0×
  124. 125NoidaUttar Pradesh, India
    1233.0×
  125. 127Wadgaon KolhatiMaharashtra, India
    1233.0×
  126. 128BhubaneswarOdisha, India
    1222.9×
  127. 129MukdahanMukdahan, Thailand
    1222.9×
  128. 130BhopalMadhya Pradesh, India
    1222.9×
  129. 131Lop BuriLopburi, Thailand
    1202.9×
  130. 132BhelaiChhattisgarh, India
    1202.9×
  131. 133AkolaMaharashtra, India
    1202.9×
  132. 134Amnat CharoenAmnat Charoen, Thailand
    1182.8×
  133. 135KhannaPunjab, India
    1172.8×
  134. 136SeonghwanChungcheongnam-do, South Korea
    1162.8×
  135. 137Puerto VarasLos Lagos Region, Chile
    1162.8×
  136. 138BhāgalpurBihar, India
    1162.8×
  137. 139PatiālaPunjab, India
    1152.7×
  138. 140MangaluruKarnataka, India
    1142.7×
  139. 141BadlapurMaharashtra, India
    1142.7×
  140. 142Nakhon LuangPhra Nakhon Si Ayutthaya, Thailand
    1132.7×
  141. 143PrayagrajUttar Pradesh, India
    1132.7×
  142. 144Sri GanganagarRajasthan, India
    1132.7×
  143. 144BūndiRajasthan, India
    1132.7×
  144. 144ArāriaBihar, India
    1132.7×
  145. 147AmravatiMaharashtra, India
    1112.6×
  146. 148KanchanaburiKanchanaburi, Thailand
    1112.6×
  147. 149GūduvāncheriTamil Nadu, India
    1102.6×
  148. 150SamāstipurBihar, India
    1102.6×
  149. 151PubalGyeonggi-do, South Korea
    1102.6×
  150. 152KraljevoCentral Serbia, Serbia
    1092.6×
  151. 153UdaipurRajasthan, India
    1092.6×
  152. 153CuttackOdisha, India
    1092.6×
  153. 155Istanbullow-cost sensorsIstanbul, Turkey
    1092.6×
  154. 156BuxarBihar, India
    1072.5×
  155. 156AurangabadMaharashtra, India
    1072.5×
  156. 158RishīkeshUttarakhand, India
    1072.5×
  157. 158PuneMaharashtra, India
    1072.5×
  158. 160HāpurUttar Pradesh, India
    1072.5×
  159. 160AsanChungcheongnam-do, South Korea
    1072.5×
  160. 162ErlunTaiwan, Taiwan
    1062.5×
  161. 163ChūruRajasthan, India
    1062.5×
  162. 163Si Maha PhotPrachin Buri, Thailand
    1062.5×
  163. 165DūngarpurRajasthan, India
    1062.5×
  164. 166GorakhpurUttar Pradesh, India
    1052.5×
  165. 166YeojuGyeonggi-do, South Korea
    1052.5×
  166. 166OsanGyeonggi-do, South Korea
    1052.5×
  167. 169JhunjhunūnRajasthan, India
    1052.5×
  168. 169Sremska MitrovicaVojvodina, Serbia
    1052.5×
  169. 171NāgaurRajasthan, India
    1052.5×
  170. 171IksanJeollabuk-do, South Korea
    1052.5×
  171. 173SaugorMadhya Pradesh, India
    1032.4×
  172. 173GayaBihar, India
    1032.4×
  173. 173NacimientoBiobio, Chile
    1032.4×
  174. 176ZemunCentral Serbia, Serbia
    1032.4×
  175. 177KruševacCentral Serbia, Serbia
    1032.4×
  176. 178KanpurUttar Pradesh, India
    1022.4×
  177. 178BikanerRajasthan, India
    1022.4×
  178. 178GunsanJeollabuk-do, South Korea
    1022.4×
  179. 181AmritsarPunjab, India
    1022.4×
  180. 181Sakon NakhonSakon Nakhon, Thailand
    1022.4×
  181. 183Pimpri-ChinchwadMaharashtra, India
    1022.4×
  182. 184KatiharBihar, India
    1012.4×
  183. 185ProkupljeCentral Serbia, Serbia
    1012.4×
  184. 185ČačakCentral Serbia, Serbia
    1012.4×
  185. 185AnseongGyeonggi-do, South Korea
    1012.4×
  186. 188JalorRajasthan, India
    1002.4×
  187. 189SuwonGyeonggi-do, South Korea
    1002.4×
  188. 190SejongSejong-si, South Korea
    992.3×
  189. 191FīrozābādUttar Pradesh, India
    992.3×
  190. 191DausaRajasthan, India
    992.3×
  191. 191ErlinTaiwan, Taiwan
    992.3×
  192. 194DhuleMaharashtra, India
    992.3×
  193. 195TangjinChungcheongnam-do, South Korea
    992.3×
  194. 196SīkarRajasthan, India
    992.3×
  195. 196GwaliorMadhya Pradesh, India
    992.3×
  196. 196BuanJeollabuk-do, South Korea
    992.3×
  197. 199PirotCentral Serbia, Serbia
    982.3×
  198. 199AgraUttar Pradesh, India
    982.3×

Top 200 of 2,699 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, April 4, 2025, smogrank.com/history/2025-04-04 (accessed 2 Oct 2026).

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