SmogRank / History / April 23, 2024

Most polluted cities on April 23, 2024

2,220 cities ranked by their average PM2.5 over the day; the worst was N'Djamena, Chad, at 382.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during April 23, 2024. All episodes.

← N'Djamena 382.0 µg/m³ 300 µg/m³15 WHO 24-hour guideline
Every city ranked for April 23, 2024, 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. 1N'DjamenaN’Djaména, Chad
    500+25.5×
  2. 2Mae SaiChiang Rai, Thailand
    1725.7×
  3. 3Ubon RatchathaniUbon Ratchathani, Thailand
    1715.6×
  4. 4PhayaoPhayao, Thailand
    1675.2×
  5. 5Santa Anita - Los FicusLima region, Peru
    1645.0×
  6. 6NanNan, Thailand
    1634.9×
  7. 7UttaraditUttaradit, Thailand
    1634.8×
  8. 7NacimientoBiobio, Chile
    1634.8×
  9. 9LampangLampang, Thailand
    1624.8×
  10. 10TlaquepaqueJalisco, Mexico
    1624.7×
  11. 11Chiang MaiChiang Mai, Thailand
    1604.6×
  12. 12KalasinKalasin, Thailand
    1594.5×
  13. 13Puerto VarasLos Lagos Region, Chile
    1584.3×
  14. 14Kathmandulow-cost sensorsBagmati Province, Nepal
    1574.3×
  15. 15Dhakalow-cost sensorsDhaka Division, Bangladesh
    1574.3×
  16. 16Chiang RaiChiang Rai, Thailand
    1564.1×
  17. 17MukdahanMukdahan, Thailand
    1554.0×
  18. 18Novi PazarCentral Serbia, Serbia
    1544.0×
  19. 19CoyhaiqueAysén, Chile
    1544.0×
  20. 20PhraePhrae, Thailand
    1544.0×
  21. 21HualpénBiobio, Chile
    1543.9×
  22. 22Vientianelow-cost sensorsVientiane Prefecture, Laos
    1523.8×
  23. 23Kamphaeng PhetKamphaeng Phet, Thailand
    1513.7×
  24. 24Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1503.7×
  25. 25LamphunLamphun, Thailand
    1483.6×
  26. 26CuranilahueBiobio, Chile
    1473.6×
  27. 27Puerto MonttLos Lagos Region, Chile
    1463.6×
  28. 28SukhothaiSukhothai, Thailand
    1453.6×
  29. 29LoeiLoei, Thailand
    1433.5×
  30. 30GuadalajaraJalisco, Mexico
    1393.4×
  31. 31San CarlosÑuble, Chile
    1363.3×
  32. 32PhichitPhichit, Thailand
    1353.3×
  33. 33VillarricaAraucania, Chile
    1343.3×
  34. 34SalamancaGuanajuato, Mexico
    1343.2×
  35. 35CairoCairo, Egypt
    1333.2×
  36. 35Sakon NakhonSakon Nakhon, Thailand
    1333.2×
  37. 37Udon ThaniUdon Thani, Thailand
    1323.2×
  38. 38TalcahuanoBiobio, Chile
    1313.2×
  39. 39Amnat CharoenAmnat Charoen, Thailand
    1313.2×
  40. 40DelhiDelhi, India
    1313.2×
  41. 41KolkataWest Bengal, India
    1253.0×
  42. 42Nakhon SawanNakhon Sawan, Thailand
    1243.0×
  43. 43SarajevoFederation of B&H, Bosnia and Herzegovina
    1222.9×
  44. 44Lop BuriLopburi, Thailand
    1182.8×
  45. 45Nong Bua LamphuNong Bua Lamphu, Thailand
    1172.8×
  46. 46YasothonYasothon, Thailand
    1172.8×
  47. 46Chai NatChai Nat, Thailand
    1172.8×
  48. 48La UniónLos Ríos Region, Chile
    1162.8×
  49. 49Los ÁngelesBiobio, Chile
    1162.8×
  50. 50Sing BuriSing Buri, Thailand
    1132.7×
  51. 51Mae SotTak, Thailand
    1122.7×
  52. 52KanchanaburiKanchanaburi, Thailand
    1102.6×
  53. 53RatchaburiRatchaburi, Thailand
    1092.6×
  54. 54Suphan BuriSuphan Buri, Thailand
    1082.6×
  55. 54ChaiyaphumChaiyaphum, Thailand
    1082.6×
  56. 56Khon KaenKhon Kaen, Thailand
    1062.5×
  57. 57YangonYangon, Myanmar
    1062.5×
  58. 58Roi EtRoi Et, Thailand
    1052.5×
  59. 58JakartaJakarta, Indonesia
    1052.5×
  60. 60ToméBiobio, Chile
    1052.5×
  61. 61RacibórzSilesia, Poland
    1042.4×
  62. 62Nakhon PathomNakhon Pathom, Thailand
    1032.4×
  63. 63OsornoLos Lagos Region, Chile
    1022.4×
  64. 64Nakhon RatchasimaNakhon Ratchasima, Thailand
    1022.4×
  65. 65HualquiBiobio, Chile
    1012.4×
  66. 65CoronelBiobio, Chile
    1012.4×
  67. 67HanoiHanoi, Vietnam
    1002.4×
  68. 68Karachilow-cost sensorsSindh, Pakistan
    992.3×
  69. 69Hua HinPrachuap Khiri Khan, Thailand
    982.3×
  70. 70ChillánÑuble, Chile
    982.3×
  71. 71CuricóMaule Region, Chile
    972.3×
  72. 72PhetchaburiPhetchaburi, Thailand
    952.2×
  73. 73JeddahMecca Region, Saudi Arabia
    952.2×
  74. 74TemucoAraucania, Chile
    952.2×
  75. 75Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    952.2×
  76. 76SaraburiSaraburi, Thailand
    942.2×
  77. 76Khlong Sam WaBangkok, Thailand
    942.2×
  78. 78Si Maha PhotPrachin Buri, Thailand
    942.2×
  79. 79Bang NaBangkok, Thailand
    942.1×
  80. 79ZapopanJalisco, Mexico
    942.1×
  81. 81Si Sa KetSi Sa Ket, Thailand
    942.1×
  82. 81Nong KhaemBangkok, Thailand
    942.1×
  83. 81Nakhon NayokNakhon Nayok, Thailand
    942.1×
  84. 84Khlong LuangPathum Thani, Thailand
    942.1×
  85. 85Villa Poeta José Gálvez BarrenecheaLima region, Peru
    932.1×
  86. 86Victoria de DurangoDurango, Mexico
    932.1×
  87. 87Ban Samae DamBangkok, Thailand
    932.1×
  88. 88AshgabatAshgabat, Turkmenistan
    912.1×
  89. 89BangkokBangkok, Thailand
    912.0×
  90. 90LimaLima Province, Peru
    902.0×
  91. 91KourouGuyane, French Guiana
    902.0×
  92. 92BaghdadBaghdad, Iraq
    902.0×
  93. 93ShanghaiShanghai, China
    902.0×
  94. 93WangarattaVictoria, Australia
    902.0×
  95. 95ShulinTaipei, Taiwan
    892.0×
  96. 96Phra PradaengSamut Prakan, Thailand
    892.0×
  97. 96Mueang NonthaburiNonthaburi, Thailand
    892.0×
  98. 98Puerto AysénAysén, Chile
    892.0×
  99. 99Lak SiBangkok, Thailand
    881.9×
  100. 100Samut SakhonSamut Sakhon, Thailand
    871.9×
  101. 101Samut PrakanSamut Prakan, Thailand
    871.9×
  102. 101ShenyangLiaoning, China
    871.9×
  103. 101KatowiceSilesia, Poland
    871.9×
  104. 104AntananarivoAnalamanga, Madagascar
    871.9×
  105. 105KigaliKigali, Rwanda
    861.9×
  106. 106BeigangTaiwan, Taiwan
    861.9×
  107. 107TaibaoTaiwan, Taiwan
    861.9×
  108. 108Khan Na YaoBangkok, Thailand
    861.8×
  109. 109Abujalow-cost sensorsFCT, Nigeria
    851.8×
  110. 110MumbaiMaharashtra, India
    851.8×
  111. 111ValjevoCentral Serbia, Serbia
    851.8×
  112. 112San Pedro de la PazBiobio, Chile
    851.8×
  113. 113ErlunTaiwan, Taiwan
    851.8×
  114. 113Jacobo HunterArequipa, Peru
    851.8×
  115. 115ValdiviaLos Ríos Region, Chile
    841.8×
  116. 116UžiceCentral Serbia, Serbia
    841.8×
  117. 117PhuketPhuket, Thailand
    841.8×
  118. 117XizhiTaipei, Taiwan
    841.8×
  119. 119Bang KapiBangkok, Thailand
    831.8×
  120. 119YongkangTaiwan, Taiwan
    831.8×
  121. 119ZhubeiTaiwan, Taiwan
    831.8×
  122. 122TaoyuanTaiwan, Taiwan
    831.7×
  123. 123FengshanTakao, Taiwan
    831.7×
  124. 124PátraWest Greece, Greece
    821.7×
  125. 125DziałdowoWarmia-Masuria, Poland
    821.7×
  126. 125ZhushanTaiwan, Taiwan
    821.7×
  127. 125ChaozhouTaiwan, Taiwan
    821.7×
  128. 125Sai MaiBangkok, Thailand
    821.7×
  129. 129Nong ChokBangkok, Thailand
    821.7×
  130. 129KłodzkoLower Silesia, Poland
    821.7×
  131. 131TaipeiTaiwan, Taiwan
    811.7×
  132. 131ErlinTaiwan, Taiwan
    811.7×
  133. 133DouliuTaiwan, Taiwan
    811.7×
  134. 133Puente AltoSantiago Metropolitan, Chile
    811.7×
  135. 135Frýdek-MístekMoravian-Silesian Region, Czechia
    801.7×
  136. 135New Taipei CityTaipei, Taiwan
    801.7×
  137. 137Jastrzębie ZdrójSilesia, Poland
    801.6×
  138. 138Addis AbabaAddis Ababa, Ethiopia
    801.6×
  139. 138YuanlinTaiwan, Taiwan
    801.6×
  140. 138NeiliTaiwan, Taiwan
    801.6×
  141. 138HsinchuTaiwan, Taiwan
    801.6×
  142. 138ConcepciónBiobio, Chile
    801.6×
  143. 143Hat YaiSongkhla, Thailand
    791.6×
  144. 143Chiayi CityTaiwan, Taiwan
    791.6×
  145. 145GuangzhouGuangdong, China
    791.6×
  146. 146ChiguayanteBiobio, Chile
    781.6×
  147. 147Bang Bo DistrictSamut Prakan, Thailand
    781.6×
  148. 148Skarżysko-KamiennaŚwiętokrzyskie, Poland
    781.6×
  149. 148Ban Khlong PrawetBangkok, Thailand
    781.6×
  150. 150TainanTaiwan, Taiwan
    781.6×
  151. 150SantiagoSantiago Metropolitan, Chile
    781.6×
  152. 152XinyingTaiwan, Taiwan
    781.6×
  153. 152KaohsiungTakao, Taiwan
    781.6×
  154. 154RabinalBaja Verapaz, Guatemala
    771.6×
  155. 155DushanbeDushanbe, Tajikistan
    771.5×
  156. 155San Francisco De BorjaLima region, Peru
    771.5×
  157. 157OpoleOpole Voivodeship, Poland
    771.5×
  158. 158BuziTaiwan, Taiwan
    771.5×
  159. 158TalaganteSantiago Metropolitan, Chile
    771.5×
  160. 160NišCentral Serbia, Serbia
    771.5×
  161. 160SurinSurin, Thailand
    771.5×
  162. 162ToufenTaiwan, Taiwan
    771.5×
  163. 163BihaćFederation of B&H, Bosnia and Herzegovina
    761.5×
  164. 163AricaArica y Parinacota Region, Chile
    761.5×
  165. 165MielecSubcarpathia, Poland
    761.5×
  166. 165ChanghuaTaiwan, Taiwan
    761.5×
  167. 165Kędzierzyn-KoźleOpole Voivodeship, Poland
    761.5×
  168. 168DaxiTaiwan, Taiwan
    761.5×
  169. 169Surat ThaniSurat Thani, Thailand
    761.5×
  170. 169OstravaMoravian-Silesian Region, Czechia
    761.5×
  171. 171MiaoliTaiwan, Taiwan
    761.5×
  172. 171TraralgonVictoria, Australia
    761.5×
  173. 171Valašské MeziříčíZlín, Czechia
    761.5×
  174. 171CelayaGuanajuato, Mexico
    761.5×
  175. 175WłocławekKujawsko-Pomorskie, Poland
    751.5×
  176. 175León de los AldamaGuanajuato, Mexico
    751.5×
  177. 177Hualien CityTaiwan, Taiwan
    751.5×
  178. 177São PauloSão Paulo, Brazil
    751.5×
  179. 177Guatemala CityGuatemala, Guatemala
    751.5×
  180. 180Ban ChangRayong, Thailand
    751.5×
  181. 180ZhudongTaiwan, Taiwan
    751.5×
  182. 180Jurong WestSingapore
    751.5×
  183. 183RanongRanong province, Thailand
    741.4×
  184. 183MagongTaiwan, Taiwan
    741.4×
  185. 183YilanTaiwan, Taiwan
    741.4×
  186. 183Wan ChaiWan Chai, Hong Kong
    741.4×
  187. 183SaijōEhime, Japan
    741.4×
  188. 188NantouTaiwan, Taiwan
    741.4×
  189. 188TangjinChungcheongnam-do, South Korea
    741.4×
  190. 190TaichungTaiwan, Taiwan
    741.4×
  191. 191Accralow-cost sensorsGreater Accra, Ghana
    741.4×
  192. 191ŁaskŁódź Voivodeship, Poland
    741.4×
  193. 191TocopillaAntofagasta, Chile
    741.4×
  194. 191Lat KrabangBangkok, Thailand
    741.4×
  195. 195DębicaSubcarpathia, Poland
    741.4×
  196. 195SatunSatun, Thailand
    741.4×
  197. 195TalcaMaule Region, Chile
    741.4×
  198. 198Ulan BatorUlaanbaatar, Mongolia
    731.4×
  199. 199SeonghwanChungcheongnam-do, South Korea
    731.4×
  200. 200OpavaMoravian-Silesian Region, Czechia
    731.4×

Top 200 of 2,220 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, April 23, 2024, smogrank.com/history/2024-04-23 (accessed 3 Oct 2026).

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