SmogRank / History / April 24, 2023

Most polluted cities on April 24, 2023

1,361 cities ranked by their average PM2.5 over the day; the worst was Nan, Thailand, at 65.3 µg/m³. Each city's own local calendar day.

OpenAQ's archive, where our readings come from, has almost none for this day. Cities in the United States and Europe have it from the EPA's and the European Environment Agency's own records of the same monitors; many cities elsewhere are missing from this board, not clean. Why.

← Nan 65.3 µg/m³ 60 µg/m³15 WHO 24-hour guideline
Every city ranked for April 24, 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. 1NanNan, Thailand
    1584.4×
  2. 2Ban HouakhouaBokeo, Laos
    1544.0×
  3. 3Sing BuriSing Buri, Thailand
    1533.9×
  4. 4Chai NatChai Nat, Thailand
    1513.7×
  5. 5DelhiDelhi, India
    1433.5×
  6. 6Suphan BuriSuphan Buri, Thailand
    1433.5×
  7. 7UttaraditUttaradit, Thailand
    1343.3×
  8. 8YangonYangon, Myanmar
    1333.2×
  9. 9Lahorelow-cost sensorsPunjab, Pakistan
    1323.2×
  10. 10Nakhon SawanNakhon Sawan, Thailand
    1323.2×
  11. 10Bang Khun ThianBangkok, Thailand
    1323.2×
  12. 12Mae SaiChiang Rai, Thailand
    1273.1×
  13. 13Lop BuriLopburi, Thailand
    1253.0×
  14. 14KhartoumKhartoum, Sudan
    1243.0×
  15. 15LampangLampang, Thailand
    1222.9×
  16. 16PhayaoPhayao, Thailand
    1202.9×
  17. 17Dhakalow-cost sensorsDhaka Division, Bangladesh
    1202.9×
  18. 18Chiang RaiChiang Rai, Thailand
    1202.9×
  19. 19PhraePhrae, Thailand
    1192.9×
  20. 20Kathmandulow-cost sensorsBagmati Province, Nepal
    1162.8×
  21. 21PhichitPhichit, Thailand
    1162.8×
  22. 22Kamphaeng PhetKamphaeng Phet, Thailand
    1162.8×
  23. 23Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    1152.7×
  24. 24SukhothaiSukhothai, Thailand
    1132.7×
  25. 25Chiang MaiChiang Mai, Thailand
    1122.7×
  26. 26RatchaburiRatchaburi, Thailand
    1102.6×
  27. 27ShenyangLiaoning, China
    1082.6×
  28. 28Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1082.5×
  29. 29Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1072.5×
  30. 30Mae SotTak, Thailand
    1062.5×
  31. 31TakTak, Thailand
    1052.5×
  32. 32Bang NaBangkok, Thailand
    1042.5×
  33. 32Wan ChaiWan Chai, Hong Kong
    1042.5×
  34. 34PhetchabunPhetchabun, Thailand
    1032.4×
  35. 35LamphunLamphun, Thailand
    1022.4×
  36. 36HanoiHanoi, Vietnam
    1022.4×
  37. 37Si Maha PhotPrachin Buri, Thailand
    1012.4×
  38. 37Khlong Sam WaBangkok, Thailand
    1012.4×
  39. 39Kampalalow-cost sensorsCentral Region, Uganda
    992.3×
  40. 40KanchanaburiKanchanaburi, Thailand
    972.3×
  41. 41Khan Na YaoBangkok, Thailand
    962.2×
  42. 42Ubon RatchathaniUbon Ratchathani, Thailand
    942.1×
  43. 42JakartaJakarta, Indonesia
    942.1×
  44. 44Hua HinPrachuap Khiri Khan, Thailand
    932.1×
  45. 45Nakhon RatchasimaNakhon Ratchasima, Thailand
    932.1×
  46. 46Mong KokYau Tsim Mong District, Hong Kong
    922.1×
  47. 47Nakhon PathomNakhon Pathom, Thailand
    922.1×
  48. 48BeijingBeijing, China
    922.1×
  49. 49Nong KhaemBangkok, Thailand
    912.1×
  50. 49Khlong LuangPathum Thani, Thailand
    912.1×
  51. 51Tha BoNong Khai, Thailand
    912.0×
  52. 52Bueng KumBangkok, Thailand
    912.0×
  53. 53BaghdadBaghdad, Iraq
    902.0×
  54. 53Udon ThaniUdon Thani, Thailand
    902.0×
  55. 55Bang Bo DistrictSamut Prakan, Thailand
    902.0×
  56. 56Lat KrabangBangkok, Thailand
    902.0×
  57. 57Ban Samae DamBangkok, Thailand
    902.0×
  58. 58PristinaPristina, Kosovo
    902.0×
  59. 59SaraburiSaraburi, Thailand
    892.0×
  60. 59Ban Talat BuengChon Buri, Thailand
    892.0×
  61. 61LoeiLoei, Thailand
    892.0×
  62. 62HyderabadTelangana, India
    892.0×
  63. 62Bang KapiBangkok, Thailand
    892.0×
  64. 64KalasinKalasin, Thailand
    881.9×
  65. 64Ban ChangRayong, Thailand
    881.9×
  66. 66BangkokBangkok, Thailand
    881.9×
  67. 67RayongRayong, Thailand
    881.9×
  68. 68Laem ChabangChon Buri, Thailand
    871.9×
  69. 69ChaiyaphumChaiyaphum, Thailand
    871.9×
  70. 70Lak SiBangkok, Thailand
    871.9×
  71. 71KigaliKigali, Rwanda
    861.9×
  72. 72Sai MaiBangkok, Thailand
    861.9×
  73. 73Samut PrakanSamut Prakan, Thailand
    851.8×
  74. 73Nong Bua LamphuNong Bua Lamphu, Thailand
    851.8×
  75. 73Ban Khlong PrawetBangkok, Thailand
    851.8×
  76. 76PakxanBolikhamsai, Laos
    851.8×
  77. 77GuangzhouGuangdong, China
    841.8×
  78. 78Si Sa KetSi Sa Ket, Thailand
    841.8×
  79. 79Karachilow-cost sensorsSindh, Pakistan
    831.8×
  80. 80BakuBaki, Azerbaijan
    831.8×
  81. 81Khon KaenKhon Kaen, Thailand
    831.7×
  82. 82Roi EtRoi Et, Thailand
    821.7×
  83. 83AshgabatAshgabat, Turkmenistan
    821.7×
  84. 84Mueang NonthaburiNonthaburi, Thailand
    821.7×
  85. 84MukdahanMukdahan, Thailand
    821.7×
  86. 86VictoriaCentral and Western, Hong Kong
    811.7×
  87. 87Sau Mau PingKwun Tong District, Hong Kong
    811.7×
  88. 88Phra PradaengSamut Prakan, Thailand
    811.7×
  89. 89AthensAttica, Greece
    791.6×
  90. 89GevgelijaGevgelija, North Macedonia
    791.6×
  91. 91ChanthaburiChanthaburi, Thailand
    781.6×
  92. 92RacibórzSilesia, Poland
    781.6×
  93. 93AranyaprathetSa Kaeo, Thailand
    771.5×
  94. 94Hat YaiSongkhla, Thailand
    771.5×
  95. 95Addis AbabaAddis Ababa, Ethiopia
    771.5×
  96. 96YalaYala, Thailand
    761.5×
  97. 96Kędzierzyn-KoźleOpole Voivodeship, Poland
    761.5×
  98. 98Kwai ChungKwai Tsing District, Hong Kong
    761.5×
  99. 99JeddahMecca Region, Saudi Arabia
    751.5×
  100. 100FanlingNorth District, Hong Kong
    751.5×
  101. 101Islamabadlow-cost sensorsIslamabad, Pakistan
    751.5×
  102. 102Samut SakhonSamut Sakhon, Thailand
    741.4×
  103. 103Buri RamBuriram, Thailand
    731.4×
  104. 103Tai PoTai Po, Hong Kong
    731.4×
  105. 105Sakon NakhonSakon Nakhon, Thailand
    721.4×
  106. 106ColomboWestern Province, Sri Lanka
    721.4×
  107. 106AberdeenSouthern District, Hong Kong
    721.4×
  108. 108MumbaiMaharashtra, India
    721.4×
  109. 109Spišská Nová VesKošice Region, Slovakia
    721.3×
  110. 110SarpsborgØstfold, Norway
    711.3×
  111. 111RužomberokŽilina Region, Slovakia
    711.3×
  112. 112BohumínMoravian-Silesian Region, Czechia
    711.3×
  113. 113RichmondCalifornia, United States
    701.3×
  114. 114PrešovPrešov Region, Slovakia
    701.3×
  115. 114FredrikstadØstfold, Norway
    701.3×
  116. 116VentspilsVentspils, Latvia
    701.3×
  117. 117NarathiwatNarathiwat, Thailand
    701.3×
  118. 117MartinŽilina Region, Slovakia
    701.3×
  119. 119TetovoTetovo, North Macedonia
    691.3×
  120. 120LegionowoMazovia, Poland
    691.3×
  121. 121HavířovMoravian-Silesian Region, Czechia
    691.2×
  122. 121KrakówLesser Poland, Poland
    691.2×
  123. 123Tsuen WanTsuen Wan, Hong Kong
    681.2×
  124. 123ŽilinaŽilina Region, Slovakia
    681.2×
  125. 125GdyniaPomerania, Poland
    681.2×
  126. 126GdańskPomerania, Poland
    681.2×
  127. 126Bielsko-BialaSilesia, Poland
    681.2×
  128. 128AsprópyrgosAttica, Greece
    671.2×
  129. 128KošiceKošice Region, Slovakia
    671.2×
  130. 128Valašské MeziříčíZlín, Czechia
    671.2×
  131. 131Tin Shui WaiYuen Long, Hong Kong
    671.2×
  132. 132RigaRiga, Latvia
    671.2×
  133. 132TratTrat, Thailand
    671.2×
  134. 132Nakło nad NoteciąKujawsko-Pomorskie, Poland
    671.2×
  135. 135KielceŚwiętokrzyskie, Poland
    671.2×
  136. 135Czechowice-DziedziceSilesia, Poland
    671.2×
  137. 135Los AngelesCalifornia, United States
    671.2×
  138. 138BanningCalifornia, United States
    671.2×
  139. 139ZvolenBanská Bystrica Region, Slovakia
    661.2×
  140. 139Český TěšínMoravian-Silesian Region, Czechia
    661.2×
  141. 141Jastrzębie ZdrójSilesia, Poland
    661.2×
  142. 142OstravaMoravian-Silesian Region, Czechia
    661.1×
  143. 143PhuketPhuket, Thailand
    661.1×
  144. 143ŁaskŁódź Voivodeship, Poland
    661.1×
  145. 145OpavaMoravian-Silesian Region, Czechia
    661.1×
  146. 145RadomskoŁódź Voivodeship, Poland
    661.1×
  147. 147BelgradeCentral Serbia, Serbia
    651.1×
  148. 147WłocławekKujawsko-Pomorskie, Poland
    651.1×
  149. 149NišCentral Serbia, Serbia
    651.1×
  150. 149OpoleOpole Voivodeship, Poland
    651.1×
  151. 151LiepājaLiepaja, Latvia
    651.1×
  152. 151KazincbarcikaBorsod-Abaúj-Zemplén, Hungary
    651.1×
  153. 153LublinLublin, Poland
    651.1×
  154. 154SkopjeGrad Skopje, North Macedonia
    641.1×
  155. 154SalorTashkent Region, Uzbekistan
    641.1×
  156. 156Sha TinSha Tin, Hong Kong
    641.1×
  157. 157ČadcaŽilina Region, Slovakia
    641.1×
  158. 157Banská BystricaBanská Bystrica Region, Slovakia
    641.1×
  159. 159StarachowiceŚwiętokrzyskie, Poland
    641.1×
  160. 159ToruńKujawsko-Pomorskie, Poland
    641.1×
  161. 161KlaipėdaKlaipėda County, Lithuania
    631.1×
  162. 161PłockMazovia, Poland
    631.1×
  163. 163BufteaIlfov, Romania
    631.0×
  164. 163PrilepPrilep, North Macedonia
    631.0×
  165. 163PúchovTrenčín Region, Slovakia
    631.0×
  166. 166WarsawMazovia, Poland
    631.0×
  167. 166PécsBaranya, Hungary
    631.0×
  168. 166KłodzkoLower Silesia, Poland
    631.0×
  169. 166OntarioCalifornia, United States
    631.0×
  170. 170EłkWarmia-Masuria, Poland
    631.0×
  171. 170Frýdek-MístekMoravian-Silesian Region, Czechia
    631.0×
  172. 170KatowiceSilesia, Poland
    631.0×
  173. 170KaliszGreater Poland, Poland
    631.0×
  174. 174ŻyrardówMazovia, Poland
    631.0×
  175. 174LučenecBanská Bystrica Region, Slovakia
    631.0×
  176. 176PiraeusAttica, Greece
    631.0×
  177. 176MarratxíBalearic Islands, Spain
    631.0×
  178. 178ChaniáCrete, Greece
    621.0×
  179. 178TrebišovKošice Region, Slovakia
    621.0×
  180. 178RuseRuse, Bulgaria
    621.0×
  181. 178ZlínZlín, Czechia
    621.0×
  182. 178IndioCalifornia, United States
    621.0×
  183. 178LiberpolisCounty of Osijek-Baranja, Croatia
    621.0×
  184. 184AcharnésAttica, Greece
    621.0×
  185. 184PruszkówMazovia, Poland
    621.0×
  186. 184Nakhon Si ThammaratNakhon Si Thammarat, Thailand
    621.0×
  187. 184KarvináMoravian-Silesian Region, Czechia
    621.0×
  188. 184ŁódźŁódź Voivodeship, Poland
    621.0×
  189. 189HraniceOlomouc Region, Czechia
    621.0×
  190. 190StrumicaStrumica, North Macedonia
    621.0×
  191. 190KrapkowiceOpole Voivodeship, Poland
    621.0×
  192. 192ThessaloníkiCentral Macedonia, Greece
    611.0×
  193. 192KavadarciKavadarci, North Macedonia
    611.0×
  194. 192SopotPomerania, Poland
    611.0×
  195. 195BardejovPrešov Region, Slovakia
    611.0×
  196. 195Žiar nad HronomBanská Bystrica Region, Slovakia
    611.0×
  197. 195SenicaTrnava Region, Slovakia
    611.0×
  198. 195KutnoŁódź Voivodeship, Poland
    611.0×
  199. 195Banja LukaSrpska, Bosnia and Herzegovina
    611.0×
  200. 200PułtuskMazovia, Poland
    611.0×

Top 200 of 1,361 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, April 24, 2023, smogrank.com/history/2023-04-24 (accessed 2 Oct 2026).

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