SmogRank / History / March 27, 2023

Most polluted cities on March 27, 2023

1,474 cities ranked by their average PM2.5 over the day; the worst was Reykjavík, Iceland, at 775.0 µg/m³. Each city's own local calendar day.

← Reykjavík 775.0 µg/m³ 700 µg/m³15 WHO 24-hour guideline
Every city ranked for March 27, 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+51.7×
  2. 2Mae SaiChiang Rai, Thailand
    500+36.9×
  3. 3Ban HouakhouaBokeo, Laos
    41818.9×
  4. 4Chiang RaiChiang Rai, Thailand
    40818.6×
  5. 5PakxanBolikhamsai, Laos
    29114.4×
  6. 6NanNan, Thailand
    27213.1×
  7. 7PhayaoPhayao, Thailand
    23110.4×
  8. 8PhraePhrae, Thailand
    1998.3×
  9. 9N'DjamenaN’Djaména, Chad
    1978.1×
  10. 10Chiang MaiChiang Mai, Thailand
    1897.3×
  11. 11LampangLampang, Thailand
    1887.2×
  12. 12LoeiLoei, Thailand
    1806.4×
  13. 13LamphunLamphun, Thailand
    1766.0×
  14. 14Kamphaeng PhetKamphaeng Phet, Thailand
    1756.0×
  15. 15BamakoBamako, Mali
    1745.9×
  16. 16Ubon RatchathaniUbon Ratchathani, Thailand
    1665.1×
  17. 17Lahorelow-cost sensorsPunjab, Pakistan
    1634.8×
  18. 18SukhothaiSukhothai, Thailand
    1614.7×
  19. 19Nong Bua LamphuNong Bua Lamphu, Thailand
    1604.5×
  20. 20Dhakalow-cost sensorsDhaka Division, Bangladesh
    1604.5×
  21. 20UttaraditUttaradit, Thailand
    1604.5×
  22. 22TlaquepaqueJalisco, Mexico
    1574.3×
  23. 23PhichitPhichit, Thailand
    1533.9×
  24. 24PhetchabunPhetchabun, Thailand
    1533.9×
  25. 25Mae SotTak, Thailand
    1523.8×
  26. 26Udon ThaniUdon Thani, Thailand
    1513.7×
  27. 27MukdahanMukdahan, Thailand
    1403.4×
  28. 28DelhiDelhi, India
    1403.4×
  29. 29Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1343.3×
  30. 29ShenyangLiaoning, China
    1343.3×
  31. 31ChaiyaphumChaiyaphum, Thailand
    1333.2×
  32. 32ZapopanJalisco, Mexico
    1283.1×
  33. 33Abujalow-cost sensorsFCT, Nigeria
    1273.1×
  34. 34Nakhon SawanNakhon Sawan, Thailand
    1263.0×
  35. 34Ciudad Benito JuárezNuevo León, Mexico
    1263.0×
  36. 36CholulaPuebla, Mexico
    1243.0×
  37. 37Kathmandulow-cost sensorsBagmati Province, Nepal
    1233.0×
  38. 38Khon KaenKhon Kaen, Thailand
    1233.0×
  39. 39San Mateo AtencoMéxico, Mexico
    1192.9×
  40. 40Si Sa KetSi Sa Ket, Thailand
    1192.8×
  41. 41Bang Khun ThianBangkok, Thailand
    1182.8×
  42. 42San Francisco TlalcilalcalpanMéxico, Mexico
    1172.8×
  43. 43Sakon NakhonSakon Nakhon, Thailand
    1172.8×
  44. 44YangonYangon, Myanmar
    1152.7×
  45. 45Islamabadlow-cost sensorsIslamabad, Pakistan
    1112.6×
  46. 46KalasinKalasin, Thailand
    1102.6×
  47. 46GuadalajaraJalisco, Mexico
    1102.6×
  48. 48KanchanaburiKanchanaburi, Thailand
    1102.6×
  49. 49XonacatlánMéxico, Mexico
    1102.6×
  50. 50BaghdadBaghdad, Iraq
    1102.6×
  51. 50Sing BuriSing Buri, Thailand
    1102.6×
  52. 52Roi EtRoi Et, Thailand
    1082.6×
  53. 53TakTak, Thailand
    1082.6×
  54. 54ShanghaiShanghai, China
    1072.5×
  55. 55Puerto MonttLos Lagos Region, Chile
    1072.5×
  56. 56Ciudad NezahualcoyotlMéxico, Mexico
    1052.5×
  57. 57Ga-RankuwaNorth West, South Africa
    1042.5×
  58. 58Nakhon RatchasimaNakhon Ratchasima, Thailand
    1042.4×
  59. 59CelayaGuanajuato, Mexico
    1032.4×
  60. 60San Salvador TizatlalliMéxico, Mexico
    1032.4×
  61. 61Kampalalow-cost sensorsCentral Region, Uganda
    1012.4×
  62. 62Lop BuriLopburi, Thailand
    1012.4×
  63. 62Guatemala CityGuatemala, Guatemala
    1012.4×
  64. 64San CarlosÑuble, Chile
    1002.4×
  65. 65Puerto VarasLos Lagos Region, Chile
    992.3×
  66. 66SalorTashkent Region, Uzbekistan
    992.3×
  67. 66ConakryConakry, Guinea
    992.3×
  68. 68KhartoumKhartoum, Sudan
    982.3×
  69. 69LinaresMaule Region, Chile
    972.3×
  70. 69HualpénBiobio, Chile
    972.3×
  71. 71CuricóMaule Region, Chile
    972.2×
  72. 72CauquenesMaule Region, Chile
    962.2×
  73. 73AlexandriaAlexandria, Egypt
    952.2×
  74. 73MexicaliBaja California, Mexico
    952.2×
  75. 75Buri RamBuriram, Thailand
    952.2×
  76. 75TolucaMéxico, Mexico
    952.2×
  77. 77Mexico CityMexico City, Mexico
    942.2×
  78. 78Suphan BuriSuphan Buri, Thailand
    942.1×
  79. 79Naucalpan de JuárezMéxico, Mexico
    932.1×
  80. 80Ciudad General EscobedoNuevo León, Mexico
    922.1×
  81. 81ChillánÑuble, Chile
    912.1×
  82. 82La UniónLos Ríos Region, Chile
    912.0×
  83. 83Tepeji del Río de OcampoHidalgo, Mexico
    902.0×
  84. 84SantiagoSantiago Metropolitan, Chile
    902.0×
  85. 85RancaguaO'Higgins Region, Chile
    892.0×
  86. 85Ciudad ApodacaNuevo León, Mexico
    892.0×
  87. 87TalcaMaule Region, Chile
    892.0×
  88. 87León de los AldamaGuanajuato, Mexico
    892.0×
  89. 89MonterreyNuevo León, Mexico
    881.9×
  90. 90Santa CatarinaNuevo León, Mexico
    881.9×
  91. 91Şabāḩ as SālimMubārak al Kabīr, Kuwait
    881.9×
  92. 92JohannesburgGauteng, South Africa
    871.9×
  93. 92MumbaiMaharashtra, India
    871.9×
  94. 92Puente AltoSantiago Metropolitan, Chile
    871.9×
  95. 95SaraburiSaraburi, Thailand
    871.9×
  96. 96RatchaburiRatchaburi, Thailand
    851.8×
  97. 96RengoO'Higgins Region, Chile
    851.8×
  98. 98QuinteroValparaiso, Chile
    841.8×
  99. 99BakuBaki, Azerbaijan
    841.8×
  100. 100Cadereyta JiménezNuevo León, Mexico
    841.8×
  101. 101Karachilow-cost sensorsSindh, Pakistan
    831.8×
  102. 102Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    831.7×
  103. 102San Juan del RíoQuerétaro, Mexico
    831.7×
  104. 104DushanbeDushanbe, Tajikistan
    821.7×
  105. 105NacimientoBiobio, Chile
    811.7×
  106. 105Los ÁngelesBiobio, Chile
    811.7×
  107. 107Viña del MarValparaiso, Chile
    811.7×
  108. 108Túxpam de Rodríguez CanoVeracruz, Mexico
    811.7×
  109. 109Pachuca de SotoHidalgo, Mexico
    801.6×
  110. 109TalaganteSantiago Metropolitan, Chile
    801.6×
  111. 111BloemfonteinFree State, South Africa
    801.6×
  112. 112QuillotaValparaiso, Chile
    791.6×
  113. 112EdinburgTexas, United States
    791.6×
  114. 114Bang NaBangkok, Thailand
    791.6×
  115. 115CoronelBiobio, Chile
    791.6×
  116. 116Bishkeklow-cost sensorsBishkek, Kyrgyzstan
    781.6×
  117. 116Santiago de QuerétaroQuerétaro, Mexico
    781.6×
  118. 118Almatylow-cost sensorsAlmaty, Kazakhstan
    781.6×
  119. 118GarcíaNuevo León, Mexico
    781.6×
  120. 120Khlong Sam WaBangkok, Thailand
    781.6×
  121. 121HualquiBiobio, Chile
    771.6×
  122. 122ValdiviaLos Ríos Region, Chile
    771.5×
  123. 123PueblaPuebla, Mexico
    771.5×
  124. 124HanoiHanoi, Vietnam
    771.5×
  125. 124YalaYala, Thailand
    771.5×
  126. 124Jastrzębie ZdrójSilesia, Poland
    771.5×
  127. 127Surat ThaniSurat Thani, Thailand
    761.5×
  128. 127LimaLima Province, Peru
    761.5×
  129. 129TalcahuanoBiobio, Chile
    761.5×
  130. 130Nong KhaemBangkok, Thailand
    761.5×
  131. 130TlaxcalaTlaxcala, Mexico
    761.5×
  132. 130ConcónValparaiso, Chile
    761.5×
  133. 133OtwockMazovia, Poland
    761.5×
  134. 134PristinaPristina, Kosovo
    761.5×
  135. 134SalamancaGuanajuato, Mexico
    761.5×
  136. 136Ban Talat BuengChon Buri, Thailand
    751.5×
  137. 136TocopillaAntofagasta, Chile
    751.5×
  138. 136LaredoTexas, United States
    751.5×
  139. 139ChisinauChișinău Municipality, Moldova
    751.5×
  140. 139TemucoAraucania, Chile
    751.5×
  141. 141TijuanaBaja California, Mexico
    741.4×
  142. 142Hua HinPrachuap Khiri Khan, Thailand
    741.4×
  143. 142ConcepciónBiobio, Chile
    741.4×
  144. 144La SerenaCoquimbo Region, Chile
    741.4×
  145. 144Saphan SungBangkok, Thailand
    741.4×
  146. 146Nong ChokBangkok, Thailand
    741.4×
  147. 147TokozaGauteng, South Africa
    741.4×
  148. 148CopiapóAtacama, Chile
    731.4×
  149. 148CoyhaiqueAysén, Chile
    731.4×
  150. 150San Pedro de la PazBiobio, Chile
    731.4×
  151. 151Ban Samae DamBangkok, Thailand
    731.4×
  152. 152Khlong LuangPathum Thani, Thailand
    731.4×
  153. 153CuranilahueBiobio, Chile
    731.4×
  154. 154AranyaprathetSa Kaeo, Thailand
    721.4×
  155. 155AntofagastaAntofagasta, Chile
    721.4×
  156. 156Sai MaiBangkok, Thailand
    711.3×
  157. 157Puerto AysénAysén, Chile
    711.3×
  158. 157Ciudad JuárezChihuahua, Mexico
    711.3×
  159. 159Khan Na YaoBangkok, Thailand
    711.3×
  160. 160ThembisaGauteng, South Africa
    711.3×
  161. 160PhuketPhuket, Thailand
    711.3×
  162. 160CoquimboCoquimbo Region, Chile
    711.3×
  163. 163ChiguayanteBiobio, Chile
    711.3×
  164. 163AricaArica y Parinacota Region, Chile
    711.3×
  165. 163Lak SiBangkok, Thailand
    711.3×
  166. 166AntananarivoAnalamanga, Madagascar
    701.3×
  167. 166Hat YaiSongkhla, Thailand
    701.3×
  168. 168BangkokBangkok, Thailand
    701.3×
  169. 169JeddahMecca Region, Saudi Arabia
    701.3×
  170. 170LotaBiobio, Chile
    701.3×
  171. 170San Luis de la PazGuanajuato, Mexico
    701.3×
  172. 172AshgabatAshgabat, Turkmenistan
    691.3×
  173. 172East HamptonVirginia, United States
    691.3×
  174. 174Mission BendTexas, United States
    691.3×
  175. 175AthensAttica, Greece
    691.3×
  176. 175ColomboWestern Province, Sri Lanka
    691.3×
  177. 175ZgierzŁódź Voivodeship, Poland
    691.3×
  178. 178Corpus ChristiTexas, United States
    691.2×
  179. 179Mueang NonthaburiNonthaburi, Thailand
    681.2×
  180. 179ŁaskŁódź Voivodeship, Poland
    681.2×
  181. 179Missouri CityTexas, United States
    681.2×
  182. 182LublinLublin, Poland
    681.2×
  183. 183Bang KapiBangkok, Thailand
    681.2×
  184. 184NišCentral Serbia, Serbia
    671.2×
  185. 184BeijingBeijing, China
    671.2×
  186. 186Ban ChangRayong, Thailand
    671.2×
  187. 186San Miguel de AllendeGuanajuato, Mexico
    671.2×
  188. 186Lat KrabangBangkok, Thailand
    671.2×
  189. 186Bueng KumBangkok, Thailand
    671.2×
  190. 190Nakhon PathomNakhon Pathom, Thailand
    671.2×
  191. 191AguascalientesAguascalientes, Mexico
    671.2×
  192. 192AcharnésAttica, Greece
    661.2×
  193. 192Eagle PassTexas, United States
    661.2×
  194. 194Czechowice-DziedziceSilesia, Poland
    661.1×
  195. 195Dimitrovgradlow-cost sensorsHaskovo, Bulgaria
    661.1×
  196. 195BaytownTexas, United States
    661.1×
  197. 197NarathiwatNarathiwat, Thailand
    651.1×
  198. 197PasadenaTexas, United States
    651.1×
  199. 199Villa Poeta José Gálvez BarrenecheaLima region, Peru
    651.1×
  200. 200Laem ChabangChon Buri, Thailand
    651.1×

Top 200 of 1,474 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 27, 2023, smogrank.com/history/2023-03-27 (accessed 2 Oct 2026).

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