SmogRank / History / March 21, 2025

Most polluted cities on March 21, 2025

2,594 cities ranked by their average PM2.5 over the day; the worst was Thiruvananthapuram, India, at 670.0 µg/m³. Each city's own local calendar day.

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

← Thiruvananthapuram 670.0 µg/m³ 600 µg/m³15 WHO 24-hour guideline
Every city ranked for March 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. 1ThiruvananthapuramKerala, India
    500+44.7×
  2. 2N'DjamenaN’Djaména, Chad
    28013.7×
  3. 3KoppalKarnataka, India
    25411.9×
  4. 4LoniUttar Pradesh, India
    23310.5×
  5. 5CuddaloreTamil Nadu, India
    2068.7×
  6. 6NalbāriAssam, India
    2058.7×
  7. 7RamanathapuramTamil Nadu, India
    2008.3×
  8. 8SiwānBihar, India
    1967.9×
  9. 9BawānaDelhi, India
    1927.6×
  10. 10GuwahatiAssam, India
    1917.5×
  11. 11Kathmandulow-cost sensorsBagmati Province, Nepal
    1796.4×
  12. 12Dhakalow-cost sensorsDhaka Division, Bangladesh
    1776.2×
  13. 13TumkūrKarnataka, India
    1776.1×
  14. 14Vientianelow-cost sensorsVientiane Prefecture, Laos
    1756.0×
  15. 15SiliguriWest Bengal, India
    1755.9×
  16. 16Dera MāndiDelhi, India
    1745.9×
  17. 17TiruchirappalliTamil Nadu, India
    1735.8×
  18. 18HanoiHanoi, Vietnam
    1715.6×
  19. 19Ban ChangRayong, Thailand
    1705.5×
  20. 20HassanKarnataka, India
    1695.4×
  21. 21HājīpurBihar, India
    1675.2×
  22. 22NegotinCentral Serbia, Serbia
    1665.1×
  23. 23NarelaDelhi, India
    1655.0×
  24. 24Charkhi DādriHaryana, India
    1655.0×
  25. 25ShillongMeghalaya, India
    1645.0×
  26. 26Sri GanganagarRajasthan, India
    1634.8×
  27. 27ŠabacCentral Serbia, Serbia
    1624.8×
  28. 28NajafgarhDelhi, India
    1614.7×
  29. 29GurugramHaryana, India
    1604.5×
  30. 30MahādMaharashtra, India
    1604.5×
  31. 31BāghpatUttar Pradesh, India
    1584.3×
  32. 32Nong KhaemBangkok, Thailand
    1584.3×
  33. 33PhetchaburiPhetchaburi, Thailand
    1574.3×
  34. 33KrotoszynGreater Poland, Poland
    1574.3×
  35. 35ZaječarCentral Serbia, Serbia
    1574.3×
  36. 36BhiwandiMaharashtra, India
    1574.3×
  37. 36Samut SakhonSamut Sakhon, Thailand
    1574.3×
  38. 38BulandshahrUttar Pradesh, India
    1574.3×
  39. 39LazarevacCentral Serbia, Serbia
    1574.2×
  40. 39SukhothaiSukhothai, Thailand
    1574.2×
  41. 41GorakhpurUttar Pradesh, India
    1564.2×
  42. 42Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1564.2×
  43. 43LeskovacCentral Serbia, Serbia
    1554.1×
  44. 44LoeiLoei, Thailand
    1554.1×
  45. 45SmederevoCentral Serbia, Serbia
    1554.1×
  46. 46VirudunagarTamil Nadu, India
    1544.0×
  47. 47NagaonAssam, India
    1544.0×
  48. 48RatchaburiRatchaburi, Thailand
    1544.0×
  49. 49LudhianaPunjab, India
    1544.0×
  50. 50CheorwonGangwon-do, South Korea
    1544.0×
  51. 51Kampalalow-cost sensorsCentral Region, Uganda
    1533.9×
  52. 52Mae SotTak, Thailand
    1533.9×
  53. 53DelhiDelhi, India
    1533.9×
  54. 54MunsanGyeonggi-do, South Korea
    1533.9×
  55. 55UttaraditUttaradit, Thailand
    1533.9×
  56. 56MuzaffarnagarUttar Pradesh, India
    1533.9×
  57. 57DewasMadhya Pradesh, India
    1533.8×
  58. 58MangaluruKarnataka, India
    1523.8×
  59. 59PratāpgarhRajasthan, India
    1523.8×
  60. 60PhetchabunPhetchabun, Thailand
    1523.8×
  61. 61PāliRajasthan, India
    1523.8×
  62. 62Bang Pakonglow-cost sensorsChachoengsao, Thailand
    1513.7×
  63. 63Nakhon PathomNakhon Pathom, Thailand
    1513.7×
  64. 64PhichitPhichit, Thailand
    1513.7×
  65. 65GangtokSikkim, India
    1513.7×
  66. 66Novi PazarCentral Serbia, Serbia
    1503.7×
  67. 67GwaliorMadhya Pradesh, India
    1493.7×
  68. 68GhāziābādUttar Pradesh, India
    1483.6×
  69. 68BadlapurMaharashtra, India
    1483.6×
  70. 70Czechowice-DziedziceSilesia, Poland
    1483.6×
  71. 71PurniaBihar, India
    1473.6×
  72. 71Bang Bo DistrictSamut Prakan, Thailand
    1473.6×
  73. 73Ban PhaeoSamut Sakhon, Thailand
    1473.6×
  74. 74PhraePhrae, Thailand
    1463.6×
  75. 75ZamośćLublin, Poland
    1443.5×
  76. 76KanchanaburiKanchanaburi, Thailand
    1443.5×
  77. 77Khlong LuangPathum Thani, Thailand
    1433.5×
  78. 78LamphunLamphun, Thailand
    1423.5×
  79. 78DhaulpurRajasthan, India
    1423.5×
  80. 80Nakhon SawanNakhon Sawan, Thailand
    1423.5×
  81. 81ZemunCentral Serbia, Serbia
    1423.5×
  82. 82Khon KaenKhon Kaen, Thailand
    1413.5×
  83. 82BhiwadiRajasthan, India
    1413.5×
  84. 84NanNan, Thailand
    1413.4×
  85. 85Goyang-siGyeonggi-do, South Korea
    1403.4×
  86. 86RānīganjWest Bengal, India
    1393.4×
  87. 87Sawai MadhopurRajasthan, India
    1393.4×
  88. 88SeoulSeoul, South Korea
    1373.3×
  89. 89Chiang MaiChiang Mai, Thailand
    1363.3×
  90. 89KłodzkoLower Silesia, Poland
    1363.3×
  91. 91NagpurMaharashtra, India
    1363.3×
  92. 91Nakhon RatchasimaNakhon Ratchasima, Thailand
    1363.3×
  93. 93Sing BuriSing Buri, Thailand
    1353.3×
  94. 93GuadalajaraJalisco, Mexico
    1353.3×
  95. 95Mueang NonthaburiNonthaburi, Thailand
    1353.3×
  96. 96ĀsansolWest Bengal, India
    1353.3×
  97. 96MandideepMadhya Pradesh, India
    1353.3×
  98. 98Lop BuriLopburi, Thailand
    1343.3×
  99. 99ThāneMaharashtra, India
    1343.3×
  100. 99Uijeongbu-siGyeonggi-do, South Korea
    1343.3×
  101. 101NaharlagunArunachal Pradesh, India
    1343.3×
  102. 102Chai NatChai Nat, Thailand
    1333.2×
  103. 103PatnaBihar, India
    1333.2×
  104. 104LampangLampang, Thailand
    1333.2×
  105. 104RourkelaOdisha, India
    1333.2×
  106. 104Gimpo-siGyeonggi-do, South Korea
    1333.2×
  107. 107MuzaffarpurBihar, India
    1323.2×
  108. 108ŚwiecieKujawsko-Pomorskie, Poland
    1323.2×
  109. 109BangkokBangkok, Thailand
    1313.2×
  110. 110GwangmyeongGyeonggi-do, South Korea
    1313.2×
  111. 111KohimaNagaland, India
    1313.2×
  112. 111KalasinKalasin, Thailand
    1313.2×
  113. 113ShenyangLiaoning, China
    1303.2×
  114. 114Nakhon LuangPhra Nakhon Si Ayutthaya, Thailand
    1303.1×
  115. 115ProkupljeCentral Serbia, Serbia
    1293.1×
  116. 116Skarżysko-KamiennaŚwiętokrzyskie, Poland
    1293.1×
  117. 116KolkataWest Bengal, India
    1293.1×
  118. 116PrayagrajUttar Pradesh, India
    1293.1×
  119. 119OtwockMazovia, Poland
    1293.1×
  120. 119Bucheon-siGyeonggi-do, South Korea
    1293.1×
  121. 119RajākheriMadhya Pradesh, India
    1293.1×
  122. 122Anyang-siGyeonggi-do, South Korea
    1293.1×
  123. 123Guri-siGyeonggi-do, South Korea
    1283.1×
  124. 123PoznańGreater Poland, Poland
    1283.1×
  125. 123BydgoszczKujawsko-Pomorskie, Poland
    1283.1×
  126. 126SuwonGyeonggi-do, South Korea
    1283.1×
  127. 127WŏnjuGangwon-do, South Korea
    1273.1×
  128. 128Debrecenlow-cost sensorsHajdú-Bihar, Hungary
    1273.1×
  129. 129KraljevoCentral Serbia, Serbia
    1263.1×
  130. 130DejCluj County, Romania
    1263.0×
  131. 131SeonghwanChungcheongnam-do, South Korea
    1263.0×
  132. 131WłocławekKujawsko-Pomorskie, Poland
    1263.0×
  133. 133YangjuGyeonggi-do, South Korea
    1263.0×
  134. 134LoznicaCentral Serbia, Serbia
    1253.0×
  135. 135NamyangjuGyeonggi-do, South Korea
    1253.0×
  136. 136RoparPunjab, India
    1243.0×
  137. 136YeojuGyeonggi-do, South Korea
    1243.0×
  138. 136GapyeongGyeonggi-do, South Korea
    1243.0×
  139. 139Si Maha PhotPrachin Buri, Thailand
    1243.0×
  140. 140BoisarMaharashtra, India
    1243.0×
  141. 140ŁaskŁódź Voivodeship, Poland
    1243.0×
  142. 142OsanGyeonggi-do, South Korea
    1243.0×
  143. 142Seongnam-siGyeonggi-do, South Korea
    1243.0×
  144. 144PančevoVojvodina, Serbia
    1233.0×
  145. 144SangāreddiTelangana, India
    1233.0×
  146. 144Ganghwa-gunIncheon, South Korea
    1233.0×
  147. 147Phra PradaengSamut Prakan, Thailand
    1233.0×
  148. 148Kamphaeng PhetKamphaeng Phet, Thailand
    1233.0×
  149. 148Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    1233.0×
  150. 148RadomskoŁódź Voivodeship, Poland
    1233.0×
  151. 151YasothonYasothon, Thailand
    1222.9×
  152. 151Prachin BuriPrachin Buri, Thailand
    1222.9×
  153. 153GwangjuGyeonggi-do, South Korea
    1222.9×
  154. 154SholapurMaharashtra, India
    1222.9×
  155. 155Yangp'yŏngGyeonggi-do, South Korea
    1222.9×
  156. 156BelgradeCentral Serbia, Serbia
    1212.9×
  157. 156LucknowUttar Pradesh, India
    1212.9×
  158. 158ClosepetKarnataka, India
    1202.9×
  159. 160Hua HinPrachuap Khiri Khan, Thailand
    1202.9×
  160. 161Roi EtRoi Et, Thailand
    1202.9×
  161. 162IksanJeollabuk-do, South Korea
    1202.9×
  162. 163AurangābādBihar, India
    1192.9×
  163. 163TratTrat, Thailand
    1192.9×
  164. 163TangjinChungcheongnam-do, South Korea
    1192.9×
  165. 163AnseongGyeonggi-do, South Korea
    1192.9×
  166. 163Gorzów WielkopolskiLubusz, Poland
    1192.9×
  167. 168KhargharMaharashtra, India
    1192.9×
  168. 169JalgaonMaharashtra, India
    1192.9×
  169. 169HongseongChungcheongnam-do, South Korea
    1192.9×
  170. 171PuneMaharashtra, India
    1192.8×
  171. 171Maha SarakhamMaha Sarakham, Thailand
    1192.8×
  172. 171Ban Talat BuengChon Buri, Thailand
    1192.8×
  173. 174NišCentral Serbia, Serbia
    1182.8×
  174. 175SiedlceMazovia, Poland
    1182.8×
  175. 176PyeongtaekGyeonggi-do, South Korea
    1182.8×
  176. 177ChanthaburiChanthaburi, Thailand
    1182.8×
  177. 177Bang KapiBangkok, Thailand
    1182.8×
  178. 177NonsanChungcheongnam-do, South Korea
    1182.8×
  179. 180AjmerRajasthan, India
    1172.8×
  180. 180Ansan-siGyeonggi-do, South Korea
    1172.8×
  181. 182GandhinagarGujarat, India
    1172.8×
  182. 183GayaBihar, India
    1172.8×
  183. 183BegusaraiBihar, India
    1172.8×
  184. 183YesanChungcheongnam-do, South Korea
    1172.8×
  185. 186Hwaseong-siGyeonggi-do, South Korea
    1172.8×
  186. 187PirotCentral Serbia, Serbia
    1162.8×
  187. 187ChaiyaphumChaiyaphum, Thailand
    1162.8×
  188. 189CiechanówMazovia, Poland
    1162.8×
  189. 190Dubailow-cost sensorsDubai, United Arab Emirates
    1162.8×
  190. 190Buri RamBuriram, Thailand
    1162.8×
  191. 190HanamGyeonggi-do, South Korea
    1162.8×
  192. 193KimjeJeollabuk-do, South Korea
    1152.8×
  193. 194BoryeongChungcheongnam-do, South Korea
    1152.7×
  194. 195DādriUttar Pradesh, India
    1152.7×
  195. 195AsanChungcheongnam-do, South Korea
    1152.7×
  196. 195AlgiersAlgiers, Algeria
    1152.7×
  197. 198TirupatiAndhra Pradesh, India
    1152.7×
  198. 198Nong Bua LamphuNong Bua Lamphu, Thailand
    1152.7×
  199. 198WabuGyeonggi-do, South Korea
    1152.7×

Top 200 of 2,594 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, March 21, 2025, smogrank.com/history/2025-03-21 (accessed 2 Oct 2026).

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