SmogRank / History / March 23, 2025

Most polluted cities on March 23, 2025

2,627 cities ranked by their average PM2.5 over the day; the worst was Saltillo, Mexico, at 987.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during March 23, 2025. All episodes.

← Saltillo 987.0 µg/m³ 900 µg/m³15 WHO 24-hour guideline
Every city ranked for March 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. 1SaltilloCoahuila, Mexico
    500+65.8×
  2. 2CuddaloreTamil Nadu, India
    500+36.5×
  3. 3LoniUttar Pradesh, India
    36017.0×
  4. 4NarelaDelhi, India
    2199.6×
  5. 5Vientianelow-cost sensorsVientiane Prefecture, Laos
    2179.4×
  6. 6NalbāriAssam, India
    2088.9×
  7. 7MuzaffarnagarUttar Pradesh, India
    2068.7×
  8. 8GuwahatiAssam, India
    1988.1×
  9. 9BāghpatUttar Pradesh, India
    1967.9×
  10. 10Cheongsong gunGyeongsangbuk-do, South Korea
    1957.9×
  11. 11ThiruvananthapuramKerala, India
    1947.8×
  12. 12NanNan, Thailand
    1937.7×
  13. 13BawānaDelhi, India
    1917.5×
  14. 14GhāziābādUttar Pradesh, India
    1867.1×
  15. 15LamphunLamphun, Thailand
    1846.9×
  16. 16Nong KhaemBangkok, Thailand
    1846.8×
  17. 16ShenyangLiaoning, China
    1846.8×
  18. 19PhraePhrae, Thailand
    1826.7×
  19. 20AurangābādBihar, India
    1816.6×
  20. 21Ban ChangRayong, Thailand
    1806.5×
  21. 22LoeiLoei, Thailand
    1776.2×
  22. 23Chiang MaiChiang Mai, Thailand
    1766.1×
  23. 24N'DjamenaN’Djaména, Chad
    1756.0×
  24. 25SasarāmBihar, India
    1756.0×
  25. 26ThanjavurTamil Nadu, India
    1745.9×
  26. 27Mae SotTak, Thailand
    1735.8×
  27. 27JalgaonMaharashtra, India
    1735.8×
  28. 29LampangLampang, Thailand
    1735.8×
  29. 30UttaraditUttaradit, Thailand
    1725.7×
  30. 31Dhakalow-cost sensorsDhaka Division, Bangladesh
    1715.6×
  31. 32Nong Bua LamphuNong Bua Lamphu, Thailand
    1705.5×
  32. 33Samut SakhonSamut Sakhon, Thailand
    1705.5×
  33. 34SukhothaiSukhothai, Thailand
    1695.4×
  34. 35Charkhi DādriHaryana, India
    1695.4×
  35. 36Bang Pakonglow-cost sensorsChachoengsao, Thailand
    1695.4×
  36. 37PhayaoPhayao, Thailand
    1685.4×
  37. 38LudhianaPunjab, India
    1685.3×
  38. 39HanumāngarhRajasthan, India
    1665.1×
  39. 40AhmedabadGujarat, India
    1665.1×
  40. 41Khlong LuangPathum Thani, Thailand
    1655.1×
  41. 42GayaBihar, India
    1655.0×
  42. 43HassanKarnataka, India
    1644.9×
  43. 44DelhiDelhi, India
    1644.9×
  44. 45Sing BuriSing Buri, Thailand
    1634.9×
  45. 45Nakhon LuangPhra Nakhon Si Ayutthaya, Thailand
    1634.9×
  46. 47Prachin BuriPrachin Buri, Thailand
    1634.9×
  47. 48Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1634.8×
  48. 49PhetchabunPhetchabun, Thailand
    1624.8×
  49. 50GurugramHaryana, India
    1624.8×
  50. 50PhichitPhichit, Thailand
    1624.8×
  51. 52BulandshahrUttar Pradesh, India
    1624.8×
  52. 53NajafgarhDelhi, India
    1624.7×
  53. 54PhetchaburiPhetchaburi, Thailand
    1624.7×
  54. 55MexicaliBaja California, Mexico
    1614.7×
  55. 56HājīpurBihar, India
    1614.7×
  56. 57AranyaprathetSa Kaeo, Thailand
    1614.6×
  57. 58Ban PhaeoSamut Sakhon, Thailand
    1614.6×
  58. 59Kampalalow-cost sensorsCentral Region, Uganda
    1604.6×
  59. 60Nakhon PathomNakhon Pathom, Thailand
    1604.6×
  60. 61Nakhon SawanNakhon Sawan, Thailand
    1604.5×
  61. 62Chiang RaiChiang Rai, Thailand
    1584.4×
  62. 63BangkokBangkok, Thailand
    1584.4×
  63. 64BhiwadiRajasthan, India
    1584.4×
  64. 65SurinSurin, Thailand
    1584.3×
  65. 66DādriUttar Pradesh, India
    1584.3×
  66. 67AnkleshwarGujarat, India
    1584.3×
  67. 67Lop BuriLopburi, Thailand
    1584.3×
  68. 69Ubon RatchathaniUbon Ratchathani, Thailand
    1574.3×
  69. 70BoisarMaharashtra, India
    1574.3×
  70. 71VirudunagarTamil Nadu, India
    1574.3×
  71. 72KłodzkoLower Silesia, Poland
    1574.2×
  72. 73RatchaburiRatchaburi, Thailand
    1574.2×
  73. 74Chai NatChai Nat, Thailand
    1574.2×
  74. 75Nakhon RatchasimaNakhon Ratchasima, Thailand
    1564.2×
  75. 76Kamphaeng PhetKamphaeng Phet, Thailand
    1564.2×
  76. 76Si Maha PhotPrachin Buri, Thailand
    1564.2×
  77. 78Udon ThaniUdon Thani, Thailand
    1564.2×
  78. 79Phra PradaengSamut Prakan, Thailand
    1554.1×
  79. 80PāliRajasthan, India
    1554.1×
  80. 80LucknowUttar Pradesh, India
    1554.1×
  81. 82Mae SaiChiang Rai, Thailand
    1554.1×
  82. 83ShillongMeghalaya, India
    1554.0×
  83. 83NagpurMaharashtra, India
    1554.0×
  84. 83Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    1554.0×
  85. 86Bang KapiBangkok, Thailand
    1554.0×
  86. 87Mueang NonthaburiNonthaburi, Thailand
    1544.0×
  87. 88Ban Talat BuengChon Buri, Thailand
    1544.0×
  88. 88ColumbusGeorgia, United States
    1544.0×
  89. 90VapiGujarat, India
    1544.0×
  90. 91KalasinKalasin, Thailand
    1544.0×
  91. 92ValjevoCentral Serbia, Serbia
    1544.0×
  92. 93ChandigarhChandigarh, India
    1543.9×
  93. 94MohaliPunjab, India
    1533.9×
  94. 95PatiālaPunjab, India
    1523.8×
  95. 96Maha SarakhamMaha Sarakham, Thailand
    1523.8×
  96. 97San Pawl il-BaħarSaint Paul’s Bay, Malta
    1523.8×
  97. 98Dera MāndiDelhi, India
    1523.8×
  98. 99YasothonYasothon, Thailand
    1523.8×
  99. 99Roi EtRoi Et, Thailand
    1523.8×
  100. 101KanchanaburiKanchanaburi, Thailand
    1523.8×
  101. 102SaraburiSaraburi, Thailand
    1523.8×
  102. 102ChaiyaphumChaiyaphum, Thailand
    1523.8×
  103. 104RoparPunjab, India
    1513.7×
  104. 105TiruchirappalliTamil Nadu, India
    1513.7×
  105. 106Sri GanganagarRajasthan, India
    1503.7×
  106. 107ZaječarCentral Serbia, Serbia
    1473.6×
  107. 107Samut PrakanSamut Prakan, Thailand
    1473.6×
  108. 109MalegaonMaharashtra, India
    1463.6×
  109. 110BuanJeollabuk-do, South Korea
    1453.6×
  110. 111MunsanGyeonggi-do, South Korea
    1453.6×
  111. 112HanoiHanoi, Vietnam
    1453.5×
  112. 113JodhpurRajasthan, India
    1433.5×
  113. 114PithampurMadhya Pradesh, India
    1433.5×
  114. 115SeonghwanChungcheongnam-do, South Korea
    1423.5×
  115. 116CheorwonGangwon-do, South Korea
    1423.5×
  116. 117IksanJeollabuk-do, South Korea
    1413.5×
  117. 118NonsanChungcheongnam-do, South Korea
    1413.4×
  118. 119KimjeJeollabuk-do, South Korea
    1403.4×
  119. 120Bang Bo DistrictSamut Prakan, Thailand
    1403.4×
  120. 121Novi PazarCentral Serbia, Serbia
    1403.4×
  121. 121ChiguayanteBiobio, Chile
    1403.4×
  122. 123ChanthaburiChanthaburi, Thailand
    1403.4×
  123. 124Gimpo-siGyeonggi-do, South Korea
    1393.4×
  124. 125MeerutUttar Pradesh, India
    1393.4×
  125. 125BhiwandiMaharashtra, India
    1393.4×
  126. 127AnseongGyeonggi-do, South Korea
    1383.4×
  127. 128RayongRayong, Thailand
    1383.4×
  128. 129Laem ChabangChon Buri, Thailand
    1383.4×
  129. 130KolkataWest Bengal, India
    1373.4×
  130. 130Bucheon-siGyeonggi-do, South Korea
    1373.4×
  131. 132AkolaMaharashtra, India
    1373.3×
  132. 133TratTrat, Thailand
    1363.3×
  133. 133HongseongChungcheongnam-do, South Korea
    1363.3×
  134. 135SuwonGyeonggi-do, South Korea
    1363.3×
  135. 135Goyang-siGyeonggi-do, South Korea
    1363.3×
  136. 137OsanGyeonggi-do, South Korea
    1353.3×
  137. 137GobindgarhPunjab, India
    1353.3×
  138. 139Suphan BuriSuphan Buri, Thailand
    1353.3×
  139. 140MuzaffarpurBihar, India
    1343.3×
  140. 141PuneMaharashtra, India
    1343.3×
  141. 142Ansan-siGyeonggi-do, South Korea
    1343.3×
  142. 143GandhinagarGujarat, India
    1343.3×
  143. 143Ganghwa-gunIncheon, South Korea
    1343.3×
  144. 145Amnat CharoenAmnat Charoen, Thailand
    1343.2×
  145. 146TangjinChungcheongnam-do, South Korea
    1333.2×
  146. 147Hwaseong-siGyeonggi-do, South Korea
    1333.2×
  147. 147Anyang-siGyeonggi-do, South Korea
    1333.2×
  148. 149AngulOdisha, India
    1323.2×
  149. 150YeojuGyeonggi-do, South Korea
    1323.2×
  150. 150AsanChungcheongnam-do, South Korea
    1323.2×
  151. 150GwangjuGyeonggi-do, South Korea
    1323.2×
  152. 153AmritsarPunjab, India
    1323.2×
  153. 153PyeongtaekGyeonggi-do, South Korea
    1323.2×
  154. 153GwangmyeongGyeonggi-do, South Korea
    1323.2×
  155. 156GunsanJeollabuk-do, South Korea
    1313.2×
  156. 156MandideepMadhya Pradesh, India
    1313.2×
  157. 158SeoulSeoul, South Korea
    1313.2×
  158. 159Si Sa KetSi Sa Ket, Thailand
    1313.2×
  159. 160YŏnmuChungcheongnam-do, South Korea
    1313.2×
  160. 161YangonYangon, Myanmar
    1303.2×
  161. 162NashikMaharashtra, India
    1303.1×
  162. 162HāpurUttar Pradesh, India
    1303.1×
  163. 162PubalGyeonggi-do, South Korea
    1303.1×
  164. 162KhargharMaharashtra, India
    1303.1×
  165. 166Kathmandulow-cost sensorsBagmati Province, Nepal
    1303.1×
  166. 166MostaIl-Mosta, Malta
    1303.1×
  167. 168PatnaBihar, India
    1293.1×
  168. 168JungpyongNorth Chungcheong, South Korea
    1293.1×
  169. 170BaddiHimachal Pradesh, India
    1293.1×
  170. 171BuyeoChungcheongnam-do, South Korea
    1283.1×
  171. 172KhannaPunjab, India
    1283.1×
  172. 173MasanGwangju, South Korea
    1283.1×
  173. 174BoryeongChungcheongnam-do, South Korea
    1283.1×
  174. 174IncheonIncheon, South Korea
    1283.1×
  175. 176MukdahanMukdahan, Thailand
    1273.1×
  176. 177NagaonAssam, India
    1273.1×
  177. 177YesanChungcheongnam-do, South Korea
    1273.1×
  178. 177JeongeupJeollabuk-do, South Korea
    1273.1×
  179. 180ThāneMaharashtra, India
    1273.1×
  180. 180Yangp'yŏngGyeonggi-do, South Korea
    1273.1×
  181. 182Uijeongbu-siGyeonggi-do, South Korea
    1253.0×
  182. 182Guri-siGyeonggi-do, South Korea
    1253.0×
  183. 184RānīganjWest Bengal, India
    1253.0×
  184. 185Seongnam-siGyeonggi-do, South Korea
    1243.0×
  185. 186NamsaJeollabuk-do, South Korea
    1243.0×
  186. 187SeosanChungcheongnam-do, South Korea
    1243.0×
  187. 188Islamabadlow-cost sensorsIslamabad, Pakistan
    1233.0×
  188. 189RishīkeshUttarakhand, India
    1233.0×
  189. 189GummidipundiTamil Nadu, India
    1233.0×
  190. 189ĀsansolWest Bengal, India
    1233.0×
  191. 189WanjuJeollabuk-do, South Korea
    1233.0×
  192. 193RamanathapuramTamil Nadu, India
    1222.9×
  193. 194AndongGyeongsangbuk-do, South Korea
    1222.9×
  194. 195Hua HinPrachuap Khiri Khan, Thailand
    1222.9×
  195. 196GwangjuGwangju, South Korea
    1212.9×
  196. 196Icheon-siGyeonggi-do, South Korea
    1212.9×
  197. 196Birminghamlow-cost sensorsEngland, United Kingdom
    1212.9×
  198. 199LeskovacCentral Serbia, Serbia
    1212.9×
  199. 199VallettaValletta, Malta
    1212.9×

Top 200 of 2,627 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, March 23, 2025, smogrank.com/history/2025-03-23 (accessed 2 Oct 2026).

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