SmogRank / History / April 20, 2024

Most polluted cities on April 20, 2024

2,270 cities ranked by their average PM2.5 over the day; the worst was N'Djamena, Chad, at 184.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during April 20, 2024. All episodes.

← N'Djamena 184.0 µg/m³ 150 µg/m³15 WHO 24-hour guideline
Every city ranked for April 20, 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
    25912.3×
  2. 2ShenyangLiaoning, China
    1968.0×
  3. 3Chiang MaiChiang Mai, Thailand
    1756.0×
  4. 4Kathmandulow-cost sensorsBagmati Province, Nepal
    1745.9×
  5. 5NanNan, Thailand
    1655.0×
  6. 6JeddahMecca Region, Saudi Arabia
    1624.8×
  7. 7PhayaoPhayao, Thailand
    1614.6×
  8. 8LamphunLamphun, Thailand
    1604.6×
  9. 9Vientianelow-cost sensorsVientiane Prefecture, Laos
    1594.4×
  10. 10Ubon RatchathaniUbon Ratchathani, Thailand
    1594.4×
  11. 11LampangLampang, Thailand
    1574.3×
  12. 12JakartaJakarta, Indonesia
    1554.1×
  13. 13Mae SaiChiang Rai, Thailand
    1544.0×
  14. 14KalasinKalasin, Thailand
    1543.9×
  15. 15OsornoLos Lagos Region, Chile
    1533.9×
  16. 16AntananarivoAnalamanga, Madagascar
    1523.8×
  17. 17Santa Anita - Los FicusLima region, Peru
    1523.8×
  18. 18HyderabadTelangana, India
    1523.8×
  19. 19TemucoAraucania, Chile
    1503.7×
  20. 20BaghdadBaghdad, Iraq
    1503.7×
  21. 21Puerto VarasLos Lagos Region, Chile
    1483.6×
  22. 22UttaraditUttaradit, Thailand
    1483.6×
  23. 23KourouGuyane, French Guiana
    1473.6×
  24. 24PhetchabunPhetchabun, Thailand
    1473.6×
  25. 25PhichitPhichit, Thailand
    1453.5×
  26. 26Dhakalow-cost sensorsDhaka Division, Bangladesh
    1423.5×
  27. 26MukdahanMukdahan, Thailand
    1423.5×
  28. 28PhraePhrae, Thailand
    1403.4×
  29. 29Kamphaeng PhetKamphaeng Phet, Thailand
    1373.3×
  30. 30Nakhon SawanNakhon Sawan, Thailand
    1363.3×
  31. 31Sing BuriSing Buri, Thailand
    1343.3×
  32. 32Chiang RaiChiang Rai, Thailand
    1343.3×
  33. 32HanoiHanoi, Vietnam
    1343.3×
  34. 34RatchaburiRatchaburi, Thailand
    1313.2×
  35. 35LoeiLoei, Thailand
    1313.2×
  36. 36SukhothaiSukhothai, Thailand
    1293.1×
  37. 37Nong KhaemBangkok, Thailand
    1293.1×
  38. 38Chai NatChai Nat, Thailand
    1283.1×
  39. 39Suphan BuriSuphan Buri, Thailand
    1263.0×
  40. 40La UniónLos Ríos Region, Chile
    1253.0×
  41. 41Nong Bua LamphuNong Bua Lamphu, Thailand
    1243.0×
  42. 42KolkataWest Bengal, India
    1212.9×
  43. 43Nakhon PathomNakhon Pathom, Thailand
    1202.9×
  44. 44Sakon NakhonSakon Nakhon, Thailand
    1202.9×
  45. 45Abujalow-cost sensorsFCT, Nigeria
    1182.8×
  46. 46ChaiyaphumChaiyaphum, Thailand
    1182.8×
  47. 47Lop BuriLopburi, Thailand
    1162.8×
  48. 48KanchanaburiKanchanaburi, Thailand
    1162.8×
  49. 48Amnat CharoenAmnat Charoen, Thailand
    1162.8×
  50. 50PubalGyeonggi-do, South Korea
    1142.7×
  51. 50VillarricaAraucania, Chile
    1142.7×
  52. 52Udon ThaniUdon Thani, Thailand
    1132.7×
  53. 53Khon KaenKhon Kaen, Thailand
    1132.7×
  54. 54Ban Samae DamBangkok, Thailand
    1112.6×
  55. 54ToméBiobio, Chile
    1112.6×
  56. 56PhetchaburiPhetchaburi, Thailand
    1112.6×
  57. 57Mae SotTak, Thailand
    1092.6×
  58. 57YeojuGyeonggi-do, South Korea
    1092.6×
  59. 59RancaguaO'Higgins Region, Chile
    1092.6×
  60. 59Puente AltoSantiago Metropolitan, Chile
    1092.6×
  61. 61CairoCairo, Egypt
    1082.6×
  62. 62YasothonYasothon, Thailand
    1082.5×
  63. 62Icheon-siGyeonggi-do, South Korea
    1082.5×
  64. 64GyeongjuGyeongsangbuk-do, South Korea
    1072.5×
  65. 65HwadoGyeonggi-do, South Korea
    1072.5×
  66. 66Ban Khlong PrawetBangkok, Thailand
    1062.5×
  67. 67Khlong Sam WaBangkok, Thailand
    1062.5×
  68. 68Samut SakhonSamut Sakhon, Thailand
    1042.5×
  69. 69BangkokBangkok, Thailand
    1032.4×
  70. 70Bang NaBangkok, Thailand
    1022.4×
  71. 71Puerto AysénAysén, Chile
    1022.4×
  72. 72GostivarGostivar, North Macedonia
    1012.4×
  73. 72RengoO'Higgins Region, Chile
    1012.4×
  74. 74SeonghwanChungcheongnam-do, South Korea
    1012.4×
  75. 75Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    1002.4×
  76. 76CheorwonGangwon-do, South Korea
    1002.4×
  77. 77Khlong LuangPathum Thani, Thailand
    1002.3×
  78. 78Phra PradaengSamut Prakan, Thailand
    992.3×
  79. 79Nakhon RatchasimaNakhon Ratchasima, Thailand
    992.3×
  80. 80Mueang NonthaburiNonthaburi, Thailand
    992.3×
  81. 81SantiagoSantiago Metropolitan, Chile
    992.3×
  82. 82SaraburiSaraburi, Thailand
    982.3×
  83. 83Roi EtRoi Et, Thailand
    982.3×
  84. 84Hua HinPrachuap Khiri Khan, Thailand
    972.3×
  85. 84Lak SiBangkok, Thailand
    972.3×
  86. 86HualquiBiobio, Chile
    962.2×
  87. 87UlsanUlsan, South Korea
    962.2×
  88. 88PohangGyeongsangbuk-do, South Korea
    962.2×
  89. 89Samut PrakanSamut Prakan, Thailand
    952.2×
  90. 89Puerto MonttLos Lagos Region, Chile
    952.2×
  91. 91YesanChungcheongnam-do, South Korea
    942.2×
  92. 91WaegwanGyeongsangbuk-do, South Korea
    942.2×
  93. 93NakatsuOita, Japan
    942.1×
  94. 94Guatemala CityGuatemala, Guatemala
    942.1×
  95. 95HitaOita, Japan
    932.1×
  96. 96San CarlosÑuble, Chile
    932.1×
  97. 97Bang KapiBangkok, Thailand
    932.1×
  98. 97Misato, SaitamaSaitama, Japan
    932.1×
  99. 99Chinch'ŏnNorth Chungcheong, South Korea
    932.1×
  100. 100YeonilGyeongsangbuk-do, South Korea
    932.1×
  101. 100UedaNagano, Japan
    932.1×
  102. 100Khan Na YaoBangkok, Thailand
    932.1×
  103. 103Sai MaiBangkok, Thailand
    932.1×
  104. 104TangjinChungcheongnam-do, South Korea
    922.1×
  105. 104SuzakaNagano, Japan
    922.1×
  106. 106SokchoGangwon-do, South Korea
    922.1×
  107. 107Hwaseong-siGyeonggi-do, South Korea
    922.1×
  108. 108YangonYangon, Myanmar
    922.1×
  109. 108WŏnjuGangwon-do, South Korea
    922.1×
  110. 108GijangBusan, South Korea
    922.1×
  111. 108HayangGyeongsangbuk-do, South Korea
    922.1×
  112. 112GyōdaSaitama, Japan
    912.0×
  113. 112NacimientoBiobio, Chile
    912.0×
  114. 114BakuBaki, Azerbaijan
    912.0×
  115. 115Gyeongsan-siGyeongsangbuk-do, South Korea
    912.0×
  116. 115ValdiviaLos Ríos Region, Chile
    912.0×
  117. 117AsanChungcheongnam-do, South Korea
    902.0×
  118. 118Nakhon NayokNakhon Nayok, Thailand
    902.0×
  119. 118Uijeongbu-siGyeonggi-do, South Korea
    902.0×
  120. 118RabinalBaja Verapaz, Guatemala
    902.0×
  121. 121KazoSaitama, Japan
    902.0×
  122. 122Hongch’ŏnGangwon-do, South Korea
    902.0×
  123. 122Donghae CityGangwon-do, South Korea
    902.0×
  124. 124Ganghwa-gunIncheon, South Korea
    902.0×
  125. 124SarajevoFederation of B&H, Bosnia and Herzegovina
    902.0×
  126. 124CuricóMaule Region, Chile
    902.0×
  127. 127Yangp'yŏngGyeonggi-do, South Korea
    892.0×
  128. 128Anyang-siGyeonggi-do, South Korea
    892.0×
  129. 129CoronelBiobio, Chile
    892.0×
  130. 129Jacobo HunterArequipa, Peru
    892.0×
  131. 131GwangjuGyeonggi-do, South Korea
    892.0×
  132. 132KukichūōSaitama, Japan
    881.9×
  133. 132CelayaGuanajuato, Mexico
    881.9×
  134. 134MunsanGyeonggi-do, South Korea
    881.9×
  135. 135PyeongtaekGyeonggi-do, South Korea
    881.9×
  136. 136Nong ChokBangkok, Thailand
    871.9×
  137. 136YeongjuGyeongsangbuk-do, South Korea
    871.9×
  138. 138Islamabadlow-cost sensorsIslamabad, Pakistan
    871.9×
  139. 138MenumaSaitama, Japan
    871.9×
  140. 138TalaganteSantiago Metropolitan, Chile
    871.9×
  141. 138HashimaGifu, Japan
    871.9×
  142. 142ŌgakiGifu, Japan
    871.9×
  143. 142FukuyamaHiroshima, Japan
    871.9×
  144. 142Villa Poeta José Gálvez BarrenecheaLima region, Peru
    871.9×
  145. 145Si Maha PhotPrachin Buri, Thailand
    871.9×
  146. 145YangjuGyeonggi-do, South Korea
    871.9×
  147. 145HwawŏnDaegu, South Korea
    871.9×
  148. 148AnseongGyeonggi-do, South Korea
    871.9×
  149. 149QuinteroValparaiso, Chile
    861.9×
  150. 150EisenGyeongsangbuk-do, South Korea
    861.9×
  151. 150SangjuGyeongsangbuk-do, South Korea
    861.9×
  152. 152YoriiSaitama, Japan
    861.9×
  153. 152TatebayashiGunma, Japan
    861.9×
  154. 152ChillánÑuble, Chile
    861.9×
  155. 155ŌmutaFukuoka, Japan
    861.9×
  156. 155AgeoSaitama, Japan
    861.9×
  157. 157BusanBusan, South Korea
    861.8×
  158. 157MorohongōSaitama, Japan
    861.8×
  159. 157HualpénBiobio, Chile
    861.8×
  160. 160ShanghaiShanghai, China
    851.8×
  161. 160Maebaru-chūōFukuoka, Japan
    851.8×
  162. 162GumiGyeongsangbuk-do, South Korea
    851.8×
  163. 162UtsunomiyaTochigi, Japan
    851.8×
  164. 162MatsueShimane, Japan
    851.8×
  165. 162KōnosuSaitama, Japan
    851.8×
  166. 162KaminokawaTochigi, Japan
    851.8×
  167. 162FukuokaFukuoka, Japan
    851.8×
  168. 168SanoTochigi, Japan
    851.8×
  169. 168Sakai-nakajimaGunma, Japan
    851.8×
  170. 170Goyang-siGyeonggi-do, South Korea
    851.8×
  171. 170Kodamachō-kodamaminamiSaitama, Japan
    851.8×
  172. 172SekimachiGifu, Japan
    851.8×
  173. 173Guri-siGyeonggi-do, South Korea
    851.8×
  174. 173Tanushimarumachi-toyokiFukuoka, Japan
    851.8×
  175. 173ChiguayanteBiobio, Chile
    851.8×
  176. 176SeoulSeoul, South Korea
    841.8×
  177. 176OsanGyeonggi-do, South Korea
    841.8×
  178. 176Ansan-siGyeonggi-do, South Korea
    841.8×
  179. 176AsakuchiOkayama, Japan
    841.8×
  180. 180Bang Bo DistrictSamut Prakan, Thailand
    841.8×
  181. 180MungyeongGyeongsangbuk-do, South Korea
    841.8×
  182. 180Cheongju-siNorth Chungcheong, South Korea
    841.8×
  183. 180NumataGunma, Japan
    841.8×
  184. 184ChungjuNorth Chungcheong, South Korea
    841.8×
  185. 184YachimataChiba, Japan
    841.8×
  186. 184GuadalajaraJalisco, Mexico
    841.8×
  187. 184KaniGifu, Japan
    841.8×
  188. 188MumbaiMaharashtra, India
    841.8×
  189. 188KasukabeSaitama, Japan
    841.8×
  190. 190KashiwaChiba, Japan
    841.8×
  191. 190HanyūSaitama, Japan
    841.8×
  192. 192Karachilow-cost sensorsSindh, Pakistan
    831.8×
  193. 192YokkaichiMie, Japan
    831.8×
  194. 192KurashikiOkayama, Japan
    831.8×
  195. 195IncheonIncheon, South Korea
    831.8×
  196. 195Higashi-MatsuyamaSaitama, Japan
    831.8×
  197. 197BeijingBeijing, China
    831.8×
  198. 197SantyokuGangwon-do, South Korea
    831.8×
  199. 197SakaiminatoTottori, Japan
    831.8×
  200. 197KumagayaSaitama, Japan
    831.8×

Top 200 of 2,270 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 20, 2024, smogrank.com/history/2024-04-20 (accessed 3 Oct 2026).

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