SmogRank / History / March 25, 2023

Most polluted cities on March 25, 2023

1,482 cities ranked by their average PM2.5 over the day; the worst was Reykjavík, Iceland, at 466.0 µg/m³. Each city's own local calendar day.

← Reykjavík 466.0 µg/m³ 400 µg/m³15 WHO 24-hour guideline
Every city ranked for March 25, 2023, 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. 1ReykjavíkCapital Region, Iceland
    500+31.1×
  2. 2Mae SaiChiang Rai, Thailand
    500+24.7×
  3. 3Ban HouakhouaBokeo, Laos
    28814.2×
  4. 4Chiang RaiChiang Rai, Thailand
    2239.9×
  5. 5PakxanBolikhamsai, Laos
    2199.6×
  6. 6PhayaoPhayao, Thailand
    2028.5×
  7. 7NanNan, Thailand
    2018.4×
  8. 8DushanbeDushanbe, Tajikistan
    1927.6×
  9. 9Dhakalow-cost sensorsDhaka Division, Bangladesh
    1917.5×
  10. 10KhartoumKhartoum, Sudan
    1907.4×
  11. 11LampangLampang, Thailand
    1846.9×
  12. 12BamakoBamako, Mali
    1836.7×
  13. 13N'DjamenaN’Djaména, Chad
    1766.1×
  14. 14Chiang MaiChiang Mai, Thailand
    1695.4×
  15. 15PhraePhrae, Thailand
    1685.3×
  16. 16LamphunLamphun, Thailand
    1655.1×
  17. 17LoeiLoei, Thailand
    1604.6×
  18. 18PhetchabunPhetchabun, Thailand
    1594.4×
  19. 19CholulaPuebla, Mexico
    1533.9×
  20. 20TlaquepaqueJalisco, Mexico
    1513.7×
  21. 21Nong Bua LamphuNong Bua Lamphu, Thailand
    1493.7×
  22. 22Ubon RatchathaniUbon Ratchathani, Thailand
    1453.6×
  23. 23BaghdadBaghdad, Iraq
    1443.5×
  24. 24MukdahanMukdahan, Thailand
    1443.5×
  25. 25San Francisco TlalcilalcalpanMéxico, Mexico
    1403.4×
  26. 26SukhothaiSukhothai, Thailand
    1393.4×
  27. 27Bang Khun ThianBangkok, Thailand
    1393.4×
  28. 28Kamphaeng PhetKamphaeng Phet, Thailand
    1373.4×
  29. 29PhichitPhichit, Thailand
    1353.3×
  30. 30Nakhon SawanNakhon Sawan, Thailand
    1333.2×
  31. 31ChaiyaphumChaiyaphum, Thailand
    1303.2×
  32. 32Udon ThaniUdon Thani, Thailand
    1293.1×
  33. 33HanoiHanoi, Vietnam
    1273.1×
  34. 33UttaraditUttaradit, Thailand
    1273.1×
  35. 35Mae SotTak, Thailand
    1273.1×
  36. 36Sakon NakhonSakon Nakhon, Thailand
    1263.1×
  37. 36KalasinKalasin, Thailand
    1263.1×
  38. 38Nakhon RatchasimaNakhon Ratchasima, Thailand
    1243.0×
  39. 39Roi EtRoi Et, Thailand
    1202.9×
  40. 40Kathmandulow-cost sensorsBagmati Province, Nepal
    1162.8×
  41. 41Abujalow-cost sensorsFCT, Nigeria
    1162.8×
  42. 42Almatylow-cost sensorsAlmaty, Kazakhstan
    1162.8×
  43. 43Lop BuriLopburi, Thailand
    1122.7×
  44. 44LinaresMaule Region, Chile
    1112.6×
  45. 45San CarlosÑuble, Chile
    1102.6×
  46. 46KanchanaburiKanchanaburi, Thailand
    1092.6×
  47. 47Suphan BuriSuphan Buri, Thailand
    1092.6×
  48. 48Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1052.5×
  49. 49Sing BuriSing Buri, Thailand
    1052.5×
  50. 50CuricóMaule Region, Chile
    1052.5×
  51. 51TalcaMaule Region, Chile
    1042.4×
  52. 52Lahorelow-cost sensorsPunjab, Pakistan
    1032.4×
  53. 52TalaganteSantiago Metropolitan, Chile
    1032.4×
  54. 54San Mateo AtencoMéxico, Mexico
    1032.4×
  55. 55Buri RamBuriram, Thailand
    1032.4×
  56. 56San Salvador TizatlalliMéxico, Mexico
    1002.4×
  57. 57AlexandriaAlexandria, Egypt
    1002.3×
  58. 58JakartaJakarta, Indonesia
    992.3×
  59. 59Si Sa KetSi Sa Ket, Thailand
    992.3×
  60. 59RancaguaO'Higgins Region, Chile
    992.3×
  61. 61SaraburiSaraburi, Thailand
    992.3×
  62. 61ShenyangLiaoning, China
    992.3×
  63. 63Ciudad Benito JuárezNuevo León, Mexico
    982.3×
  64. 64CelayaGuanajuato, Mexico
    982.3×
  65. 65MexicaliBaja California, Mexico
    972.2×
  66. 66Viña del MarValparaiso, Chile
    962.2×
  67. 67HualpénBiobio, Chile
    962.2×
  68. 68ChillánÑuble, Chile
    962.2×
  69. 69GuadalajaraJalisco, Mexico
    962.2×
  70. 70Kampalalow-cost sensorsCentral Region, Uganda
    952.2×
  71. 70SantiagoSantiago Metropolitan, Chile
    952.2×
  72. 72HualquiBiobio, Chile
    952.2×
  73. 73RatchaburiRatchaburi, Thailand
    942.2×
  74. 74TolucaMéxico, Mexico
    942.1×
  75. 75XonacatlánMéxico, Mexico
    932.1×
  76. 76Naucalpan de JuárezMéxico, Mexico
    932.1×
  77. 77DelhiDelhi, India
    932.1×
  78. 77Ciudad NezahualcoyotlMéxico, Mexico
    932.1×
  79. 79QuillotaValparaiso, Chile
    922.1×
  80. 80BakuBaki, Azerbaijan
    912.0×
  81. 81AthensAttica, Greece
    902.0×
  82. 82RengoO'Higgins Region, Chile
    902.0×
  83. 83QuinteroValparaiso, Chile
    902.0×
  84. 84PueblaPuebla, Mexico
    892.0×
  85. 85Bang NaBangkok, Thailand
    881.9×
  86. 86YangonYangon, Myanmar
    881.9×
  87. 87Karachilow-cost sensorsSindh, Pakistan
    881.9×
  88. 88SalorTashkent Region, Uzbekistan
    881.9×
  89. 89TakTak, Thailand
    871.9×
  90. 90ConcónValparaiso, Chile
    871.9×
  91. 91Puente AltoSantiago Metropolitan, Chile
    871.9×
  92. 92NacimientoBiobio, Chile
    861.9×
  93. 92Los ÁngelesBiobio, Chile
    861.9×
  94. 94Tepeji del Río de OcampoHidalgo, Mexico
    861.9×
  95. 95Bishkeklow-cost sensorsBishkek, Kyrgyzstan
    861.9×
  96. 96Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    861.9×
  97. 96CoyhaiqueAysén, Chile
    861.9×
  98. 98Ribeirão PretoSão Paulo, Brazil
    861.8×
  99. 99Ga-RankuwaNorth West, South Africa
    851.8×
  100. 100Puerto VarasLos Lagos Region, Chile
    851.8×
  101. 101Hua HinPrachuap Khiri Khan, Thailand
    841.8×
  102. 102LimaLima Province, Peru
    841.8×
  103. 103Mexico CityMexico City, Mexico
    831.8×
  104. 104Khlong Sam WaBangkok, Thailand
    831.8×
  105. 105Túxpam de Rodríguez CanoVeracruz, Mexico
    821.7×
  106. 106La OrotavaCanary Islands, Spain
    811.7×
  107. 107La SerenaCoquimbo Region, Chile
    811.7×
  108. 107Saphan SungBangkok, Thailand
    811.7×
  109. 109Nong KhaemBangkok, Thailand
    811.7×
  110. 110Nakhon PathomNakhon Pathom, Thailand
    801.7×
  111. 110Santiago de QuerétaroQuerétaro, Mexico
    801.7×
  112. 112Wan ChaiWan Chai, Hong Kong
    801.6×
  113. 113Nong ChokBangkok, Thailand
    801.6×
  114. 114Sai MaiBangkok, Thailand
    791.6×
  115. 115TijuanaBaja California, Mexico
    791.6×
  116. 116Khlong LuangPathum Thani, Thailand
    791.6×
  117. 117Ban Samae DamBangkok, Thailand
    781.6×
  118. 118TlaxcalaTlaxcala, Mexico
    781.6×
  119. 119BucharestBucharest, Romania
    771.6×
  120. 119NišCentral Serbia, Serbia
    771.6×
  121. 121Lak SiBangkok, Thailand
    771.5×
  122. 122BangkokBangkok, Thailand
    771.5×
  123. 123Khan Na YaoBangkok, Thailand
    771.5×
  124. 124ChisinauChișinău Municipality, Moldova
    771.5×
  125. 125CuernavacaMorelos, Mexico
    771.5×
  126. 126CoquimboCoquimbo Region, Chile
    761.5×
  127. 127Pachuca de SotoHidalgo, Mexico
    761.5×
  128. 128Bang KapiBangkok, Thailand
    761.5×
  129. 129ThessaloníkiCentral Macedonia, Greece
    761.5×
  130. 129SalamancaGuanajuato, Mexico
    761.5×
  131. 131ValdiviaLos Ríos Region, Chile
    751.5×
  132. 132YalaYala, Thailand
    751.5×
  133. 132Villa Poeta José Gálvez BarrenecheaLima region, Peru
    751.5×
  134. 132BrownsvilleTexas, United States
    751.5×
  135. 135Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    751.5×
  136. 136Yerevanlow-cost sensorsYerevan, Armenia
    741.4×
  137. 137RabinalBaja Verapaz, Guatemala
    741.4×
  138. 137CoronelBiobio, Chile
    741.4×
  139. 139Bueng KumBangkok, Thailand
    741.4×
  140. 140Guatemala CityGuatemala, Guatemala
    741.4×
  141. 141Mong KokYau Tsim Mong District, Hong Kong
    741.4×
  142. 142BeijingBeijing, China
    731.4×
  143. 143AsprópyrgosAttica, Greece
    731.4×
  144. 143TrangTrang, Thailand
    731.4×
  145. 143Mueang NonthaburiNonthaburi, Thailand
    731.4×
  146. 143TalcahuanoBiobio, Chile
    731.4×
  147. 147CauquenesMaule Region, Chile
    731.4×
  148. 147Lat KrabangBangkok, Thailand
    731.4×
  149. 149San Pedro de la PazBiobio, Chile
    731.4×
  150. 150Great FallsMontana, United States
    721.4×
  151. 151TemucoAraucania, Chile
    721.4×
  152. 151Puerto AysénAysén, Chile
    721.4×
  153. 153AntofagastaAntofagasta, Chile
    721.4×
  154. 153San Luis de la PazGuanajuato, Mexico
    721.4×
  155. 155TaubatéSão Paulo, Brazil
    721.4×
  156. 156Ban ChangRayong, Thailand
    711.3×
  157. 157Ciudad ApodacaNuevo León, Mexico
    711.3×
  158. 158Surat ThaniSurat Thani, Thailand
    711.3×
  159. 159Samut SakhonSamut Sakhon, Thailand
    711.3×
  160. 159Puerto MonttLos Lagos Region, Chile
    711.3×
  161. 161PristinaPristina, Kosovo
    701.3×
  162. 161ConcepciónBiobio, Chile
    701.3×
  163. 163AntananarivoAnalamanga, Madagascar
    701.3×
  164. 163Ban Khlong PrawetBangkok, Thailand
    701.3×
  165. 163TocopillaAntofagasta, Chile
    701.3×
  166. 163AricaArica y Parinacota Region, Chile
    701.3×
  167. 167Bang Bo DistrictSamut Prakan, Thailand
    701.3×
  168. 167CopiapóAtacama, Chile
    701.3×
  169. 169ChiguayanteBiobio, Chile
    701.3×
  170. 170AcharnésAttica, Greece
    691.3×
  171. 171Samut PrakanSamut Prakan, Thailand
    691.3×
  172. 171San Juan del RíoQuerétaro, Mexico
    691.3×
  173. 173Laem ChabangChon Buri, Thailand
    691.2×
  174. 173ValenciaValencia, Spain
    691.2×
  175. 173JundiaíSão Paulo, Brazil
    691.2×
  176. 176MumbaiMaharashtra, India
    691.2×
  177. 177CuranilahueBiobio, Chile
    681.2×
  178. 178PiraeusAttica, Greece
    681.2×
  179. 178Hat YaiSongkhla, Thailand
    681.2×
  180. 178ShanghaiShanghai, China
    681.2×
  181. 178Santo AndréSão Paulo, Brazil
    681.2×
  182. 178Rio ClaroSão Paulo, Brazil
    681.2×
  183. 183CalgaryAlberta, Canada
    671.2×
  184. 184PrešovPrešov Region, Slovakia
    671.2×
  185. 184Ban Talat BuengChon Buri, Thailand
    671.2×
  186. 184Tsuen WanTsuen Wan, Hong Kong
    671.2×
  187. 184IzegemFlanders, Belgium
    671.2×
  188. 188Kwai ChungKwai Tsing District, Hong Kong
    671.2×
  189. 189Si Maha PhotPrachin Buri, Thailand
    671.2×
  190. 189AirdrieAlberta, Canada
    671.2×
  191. 191EdinburgTexas, United States
    661.2×
  192. 192RzeszówSubcarpathia, Poland
    661.1×
  193. 192São PauloSão Paulo, Brazil
    661.1×
  194. 194LublinLublin, Poland
    661.1×
  195. 194AranyaprathetSa Kaeo, Thailand
    661.1×
  196. 194VictoriaCentral and Western, Hong Kong
    661.1×
  197. 194CalamaAntofagasta, Chile
    661.1×
  198. 198La UniónLos Ríos Region, Chile
    661.1×
  199. 199Sau Mau PingKwun Tong District, Hong Kong
    661.1×
  200. 199CampinasSão Paulo, Brazil
    661.1×

Top 200 of 1,482 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 25, 2023, smogrank.com/history/2023-03-25 (accessed 2 Oct 2026).

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