SmogRank / History / March 28, 2023

Most polluted cities on March 28, 2023

1,488 cities ranked by their average PM2.5 over the day; the worst was Mae Sai, Thailand, at 499.0 µg/m³. Each city's own local calendar day.

← Mae Sai 499.0 µg/m³ 400 µg/m³15 WHO 24-hour guideline
Every city ranked for March 28, 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. 1Mae SaiChiang Rai, Thailand
    500+33.3×
  2. 2Chiang RaiChiang Rai, Thailand
    500+23.2×
  3. 3PhayaoPhayao, Thailand
    22710.1×
  4. 4NanNan, Thailand
    2229.8×
  5. 5Dhakalow-cost sensorsDhaka Division, Bangladesh
    2038.5×
  6. 6LoeiLoei, Thailand
    1967.9×
  7. 7LampangLampang, Thailand
    1887.2×
  8. 8PhraePhrae, Thailand
    1816.6×
  9. 9Chiang MaiChiang Mai, Thailand
    1796.4×
  10. 10LamphunLamphun, Thailand
    1796.4×
  11. 11Lahorelow-cost sensorsPunjab, Pakistan
    1796.4×
  12. 12PakxanBolikhamsai, Laos
    1796.3×
  13. 13BamakoBamako, Mali
    1766.1×
  14. 14TlaquepaqueJalisco, Mexico
    1735.8×
  15. 15SukhothaiSukhothai, Thailand
    1715.6×
  16. 16N'DjamenaN’Djaména, Chad
    1695.4×
  17. 17Kamphaeng PhetKamphaeng Phet, Thailand
    1644.9×
  18. 18Ubon RatchathaniUbon Ratchathani, Thailand
    1584.4×
  19. 19BeijingBeijing, China
    1574.3×
  20. 20AlexandriaAlexandria, Egypt
    1574.3×
  21. 21UttaraditUttaradit, Thailand
    1564.2×
  22. 22Kathmandulow-cost sensorsBagmati Province, Nepal
    1554.1×
  23. 23DelhiDelhi, India
    1554.0×
  24. 24PhichitPhichit, Thailand
    1523.8×
  25. 25PhetchabunPhetchabun, Thailand
    1483.6×
  26. 26Mae SotTak, Thailand
    1473.6×
  27. 27CholulaPuebla, Mexico
    1453.6×
  28. 28TakTak, Thailand
    1443.5×
  29. 29Abujalow-cost sensorsFCT, Nigeria
    1443.5×
  30. 30Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1353.3×
  31. 31Si Sa KetSi Sa Ket, Thailand
    1353.3×
  32. 32GuadalajaraJalisco, Mexico
    1293.1×
  33. 33San Mateo AtencoMéxico, Mexico
    1273.1×
  34. 34Nong Bua LamphuNong Bua Lamphu, Thailand
    1253.0×
  35. 35ShenyangLiaoning, China
    1222.9×
  36. 36Udon ThaniUdon Thani, Thailand
    1222.9×
  37. 37Nakhon SawanNakhon Sawan, Thailand
    1222.9×
  38. 38CelayaGuanajuato, Mexico
    1172.8×
  39. 39MukdahanMukdahan, Thailand
    1172.8×
  40. 40Kampalalow-cost sensorsCentral Region, Uganda
    1152.7×
  41. 41Lop BuriLopburi, Thailand
    1152.7×
  42. 42ChaiyaphumChaiyaphum, Thailand
    1132.7×
  43. 42XonacatlánMéxico, Mexico
    1132.7×
  44. 42San Salvador TizatlalliMéxico, Mexico
    1132.7×
  45. 45ZapopanJalisco, Mexico
    1122.7×
  46. 46Bang Khun ThianBangkok, Thailand
    1102.6×
  47. 47Sing BuriSing Buri, Thailand
    1082.6×
  48. 48TemucoAraucania, Chile
    1042.5×
  49. 49MexicaliBaja California, Mexico
    1042.4×
  50. 50ShanghaiShanghai, China
    1032.4×
  51. 51Roi EtRoi Et, Thailand
    1012.4×
  52. 52Buri RamBuriram, Thailand
    1012.4×
  53. 52TolucaMéxico, Mexico
    1012.4×
  54. 54Khon KaenKhon Kaen, Thailand
    992.3×
  55. 55YangonYangon, Myanmar
    992.3×
  56. 56Bishkeklow-cost sensorsBishkek, Kyrgyzstan
    992.3×
  57. 57Islamabadlow-cost sensorsIslamabad, Pakistan
    982.3×
  58. 57ConakryConakry, Guinea
    982.3×
  59. 57San Francisco TlalcilalcalpanMéxico, Mexico
    982.3×
  60. 60KalasinKalasin, Thailand
    972.3×
  61. 61HanoiHanoi, Vietnam
    972.3×
  62. 62Nakhon RatchasimaNakhon Ratchasima, Thailand
    962.2×
  63. 63Puente AltoSantiago Metropolitan, Chile
    962.2×
  64. 64San Luis PotosíSan Luis Potosí, Mexico
    962.2×
  65. 65Ciudad NezahualcoyotlMéxico, Mexico
    942.1×
  66. 66SalamancaGuanajuato, Mexico
    942.1×
  67. 67KanchanaburiKanchanaburi, Thailand
    932.1×
  68. 68Tepeji del Río de OcampoHidalgo, Mexico
    932.1×
  69. 68RancaguaO'Higgins Region, Chile
    932.1×
  70. 70GarcíaNuevo León, Mexico
    922.1×
  71. 71SantiagoSantiago Metropolitan, Chile
    922.1×
  72. 72KhartoumKhartoum, Sudan
    912.0×
  73. 73MumbaiMaharashtra, India
    912.0×
  74. 74Santiago de QuerétaroQuerétaro, Mexico
    902.0×
  75. 75CoyhaiqueAysén, Chile
    902.0×
  76. 76ColomboWestern Province, Sri Lanka
    892.0×
  77. 77León de los AldamaGuanajuato, Mexico
    881.9×
  78. 78Mexico CityMexico City, Mexico
    881.9×
  79. 79Si Maha PhotPrachin Buri, Thailand
    881.9×
  80. 80RabinalBaja Verapaz, Guatemala
    881.9×
  81. 80Guatemala CityGuatemala, Guatemala
    881.9×
  82. 82Suphan BuriSuphan Buri, Thailand
    871.9×
  83. 82HualpénBiobio, Chile
    871.9×
  84. 84Naucalpan de JuárezMéxico, Mexico
    871.9×
  85. 85Almatylow-cost sensorsAlmaty, Kazakhstan
    871.9×
  86. 85San Juan del RíoQuerétaro, Mexico
    871.9×
  87. 87Ciudad Benito JuárezNuevo León, Mexico
    861.9×
  88. 88SaraburiSaraburi, Thailand
    861.9×
  89. 89QuillotaValparaiso, Chile
    861.9×
  90. 90San Luis de la PazGuanajuato, Mexico
    861.8×
  91. 91SaltilloCoahuila, Mexico
    851.8×
  92. 92QuinteroValparaiso, Chile
    851.8×
  93. 92Puerto MonttLos Lagos Region, Chile
    851.8×
  94. 94Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    851.8×
  95. 95BaghdadBaghdad, Iraq
    831.8×
  96. 96San Miguel de AllendeGuanajuato, Mexico
    831.8×
  97. 97TalaganteSantiago Metropolitan, Chile
    831.7×
  98. 98RengoO'Higgins Region, Chile
    821.7×
  99. 98Puerto VarasLos Lagos Region, Chile
    821.7×
  100. 100RatchaburiRatchaburi, Thailand
    821.7×
  101. 100Sakon NakhonSakon Nakhon, Thailand
    821.7×
  102. 102Viña del MarValparaiso, Chile
    821.7×
  103. 103TocopillaAntofagasta, Chile
    821.7×
  104. 103AricaArica y Parinacota Region, Chile
    821.7×
  105. 105Ga-RankuwaNorth West, South Africa
    821.7×
  106. 106La UniónLos Ríos Region, Chile
    811.7×
  107. 107AranyaprathetSa Kaeo, Thailand
    811.7×
  108. 107Puerto AysénAysén, Chile
    811.7×
  109. 109Bang NaBangkok, Thailand
    811.7×
  110. 110BogotáBogota D.C., Colombia
    811.7×
  111. 111CuricóMaule Region, Chile
    801.6×
  112. 112SulphurLouisiana, United States
    791.6×
  113. 113PueblaPuebla, Mexico
    791.6×
  114. 114NacimientoBiobio, Chile
    791.6×
  115. 115Pachuca de SotoHidalgo, Mexico
    791.6×
  116. 116IrapuatoGuanajuato, Mexico
    781.6×
  117. 116Khlong Sam WaBangkok, Thailand
    781.6×
  118. 118ConcónValparaiso, Chile
    781.6×
  119. 119OsornoLos Lagos Region, Chile
    771.5×
  120. 120AntananarivoAnalamanga, Madagascar
    771.5×
  121. 120LinaresMaule Region, Chile
    771.5×
  122. 122BakuBaki, Azerbaijan
    761.5×
  123. 122MinatitlánVeracruz, Mexico
    761.5×
  124. 122CauquenesMaule Region, Chile
    761.5×
  125. 122St. John'sNewfoundland and Labrador, Canada
    761.5×
  126. 122Lat KrabangBangkok, Thailand
    761.5×
  127. 127Surat ThaniSurat Thani, Thailand
    751.5×
  128. 127YalaYala, Thailand
    751.5×
  129. 127AntofagastaAntofagasta, Chile
    751.5×
  130. 130PristinaPristina, Kosovo
    751.5×
  131. 131La SerenaCoquimbo Region, Chile
    751.5×
  132. 131LimaLima Province, Peru
    751.5×
  133. 131Sai MaiBangkok, Thailand
    751.5×
  134. 134Ban Talat BuengChon Buri, Thailand
    741.4×
  135. 135Khlong LuangPathum Thani, Thailand
    741.4×
  136. 136Karachilow-cost sensorsSindh, Pakistan
    731.4×
  137. 136Hat YaiSongkhla, Thailand
    731.4×
  138. 138Nong KhaemBangkok, Thailand
    731.4×
  139. 138Túxpam de Rodríguez CanoVeracruz, Mexico
    731.4×
  140. 138TlaxcalaTlaxcala, Mexico
    731.4×
  141. 138AguascalientesAguascalientes, Mexico
    731.4×
  142. 142ValdiviaLos Ríos Region, Chile
    731.4×
  143. 142CopiapóAtacama, Chile
    731.4×
  144. 144BangkokBangkok, Thailand
    731.4×
  145. 145Ban ChangRayong, Thailand
    721.4×
  146. 145Ciudad JuárezChihuahua, Mexico
    721.4×
  147. 147GuanajuatoGuanajuato, Mexico
    721.4×
  148. 148TalcaMaule Region, Chile
    721.4×
  149. 148Ciudad General EscobedoNuevo León, Mexico
    721.4×
  150. 150GuangzhouGuangdong, China
    711.3×
  151. 150Santa CatarinaNuevo León, Mexico
    711.3×
  152. 152Ban Samae DamBangkok, Thailand
    711.3×
  153. 153CoquimboCoquimbo Region, Chile
    711.3×
  154. 154ChillánÑuble, Chile
    711.3×
  155. 154Lak SiBangkok, Thailand
    711.3×
  156. 156Los ÁngelesBiobio, Chile
    701.3×
  157. 157CuranilahueBiobio, Chile
    701.3×
  158. 158KlerksdorpNorth West, South Africa
    701.3×
  159. 159PhuketPhuket, Thailand
    701.3×
  160. 160Bang Bo DistrictSamut Prakan, Thailand
    691.3×
  161. 160CoronelBiobio, Chile
    691.3×
  162. 160Bueng KumBangkok, Thailand
    691.3×
  163. 163Laem ChabangChon Buri, Thailand
    691.3×
  164. 163TalcahuanoBiobio, Chile
    691.3×
  165. 163Daytona BeachFlorida, United States
    691.3×
  166. 166KościanGreater Poland, Poland
    691.3×
  167. 167VereenigingGauteng, South Africa
    691.2×
  168. 168Şabāḩ as SālimMubārak al Kabīr, Kuwait
    691.2×
  169. 169GijónAsturias, Spain
    681.2×
  170. 170Wan ChaiWan Chai, Hong Kong
    681.2×
  171. 170HualquiBiobio, Chile
    681.2×
  172. 172Nakhon PathomNakhon Pathom, Thailand
    681.2×
  173. 172Jastrzębie ZdrójSilesia, Poland
    681.2×
  174. 172San Andrés TuxtlaVeracruz, Mexico
    681.2×
  175. 172Ciudad ApodacaNuevo León, Mexico
    681.2×
  176. 176Hua HinPrachuap Khiri Khan, Thailand
    681.2×
  177. 176SalorTashkent Region, Uzbekistan
    681.2×
  178. 178VeracruzVeracruz, Mexico
    671.2×
  179. 179Banja LukaSrpska, Bosnia and Herzegovina
    671.2×
  180. 180Samut PrakanSamut Prakan, Thailand
    671.2×
  181. 180Mueang NonthaburiNonthaburi, Thailand
    671.2×
  182. 180Ban Khlong PrawetBangkok, Thailand
    671.2×
  183. 183Nakhon Si ThammaratNakhon Si Thammarat, Thailand
    661.2×
  184. 183NarathiwatNarathiwat, Thailand
    661.2×
  185. 183MonterreyNuevo León, Mexico
    661.2×
  186. 186JeddahMecca Region, Saudi Arabia
    661.1×
  187. 186San Pedro de la PazBiobio, Chile
    661.1×
  188. 188SamaAsturias, Spain
    661.1×
  189. 189Ponca CityOklahoma, United States
    651.1×
  190. 190ToméBiobio, Chile
    641.1×
  191. 191AbasoloGuanajuato, Mexico
    641.1×
  192. 191EtwatwaGauteng, South Africa
    641.1×
  193. 193BurrianaValencia, Spain
    631.1×
  194. 193Fort SmithArkansas, United States
    631.1×
  195. 195GreenvilleSouth Carolina, United States
    631.0×
  196. 196CalamaAntofagasta, Chile
    631.0×
  197. 196MooreOklahoma, United States
    631.0×
  198. 198San Francisco De BorjaLima region, Peru
    631.0×
  199. 199BrakpanGauteng, South Africa
    631.0×
  200. 199OviedoAsturias, Spain
    631.0×

Top 200 of 1,488 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 28, 2023, smogrank.com/history/2023-03-28 (accessed 2 Oct 2026).

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