SmogRank / History / May 20, 2024

Most polluted cities on May 20, 2024

2,299 cities ranked by their average PM2.5 over the day; the worst was N'Djamena, Chad, at 241.0 µg/m³. Each city's own local calendar day.

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

← N'Djamena 241.0 µg/m³ 200 µg/m³15 WHO 24-hour guideline
Every city ranked for May 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
    33216.1×
  2. 2CoyhaiqueAysén, Chile
    1846.8×
  3. 3RabinalBaja Verapaz, Guatemala
    1836.7×
  4. 4CairoCairo, Egypt
    1796.4×
  5. 5CuricóMaule Region, Chile
    1735.8×
  6. 6NacimientoBiobio, Chile
    1715.6×
  7. 7Guatemala CityGuatemala, Guatemala
    1705.5×
  8. 8DelhiDelhi, India
    1645.0×
  9. 9TalaganteSantiago Metropolitan, Chile
    1634.9×
  10. 10BaghdadBaghdad, Iraq
    1634.8×
  11. 11Dhakalow-cost sensorsDhaka Division, Bangladesh
    1624.7×
  12. 12RengoO'Higgins Region, Chile
    1614.6×
  13. 13Puerto AysénAysén, Chile
    1604.5×
  14. 14TalcaMaule Region, Chile
    1594.5×
  15. 15RancaguaO'Higgins Region, Chile
    1584.4×
  16. 16CatañoCataño, Puerto Rico
    1584.4×
  17. 17Lahorelow-cost sensorsPunjab, Pakistan
    1584.4×
  18. 18San CarlosÑuble, Chile
    1584.3×
  19. 19Kathmandulow-cost sensorsBagmati Province, Nepal
    1574.3×
  20. 20QuilpuéValparaiso, Chile
    1574.2×
  21. 21HualpénBiobio, Chile
    1574.2×
  22. 22ChillánÑuble, Chile
    1564.2×
  23. 23DushanbeDushanbe, Tajikistan
    1554.1×
  24. 24SantiagoSantiago Metropolitan, Chile
    1554.0×
  25. 25Santa Anita - Los FicusLima region, Peru
    1544.0×
  26. 26Victoria de DurangoDurango, Mexico
    1533.9×
  27. 27CauquenesMaule Region, Chile
    1533.9×
  28. 28QuillotaValparaiso, Chile
    1523.8×
  29. 29Los ÁngelesBiobio, Chile
    1523.8×
  30. 30CuranilahueBiobio, Chile
    1503.7×
  31. 31TemucoAraucania, Chile
    1373.3×
  32. 32QuinteroValparaiso, Chile
    1363.3×
  33. 33Puente AltoSantiago Metropolitan, Chile
    1263.0×
  34. 34Viña del MarValparaiso, Chile
    1243.0×
  35. 35San Pawl il-BaħarSaint Paul’s Bay, Malta
    1212.9×
  36. 36MissionTexas, United States
    1202.9×
  37. 37MostaIl-Mosta, Malta
    1172.8×
  38. 38ConcónValparaiso, Chile
    1172.8×
  39. 39Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1162.8×
  40. 40ŻabbarĦaż-Żabbar, Malta
    1152.7×
  41. 41TainanTaiwan, Taiwan
    1132.7×
  42. 42VallettaValletta, Malta
    1122.7×
  43. 43La UniónLos Ríos Region, Chile
    1102.6×
  44. 44La SerenaCoquimbo Region, Chile
    1102.6×
  45. 45FengshanTakao, Taiwan
    1092.6×
  46. 46BeijingBeijing, China
    1072.5×
  47. 47OsornoLos Lagos Region, Chile
    1072.5×
  48. 48MukdahanMukdahan, Thailand
    1062.5×
  49. 48YongkangTaiwan, Taiwan
    1062.5×
  50. 50CoronelBiobio, Chile
    1062.5×
  51. 51CelayaGuanajuato, Mexico
    1032.4×
  52. 52Shakaskraallow-cost sensorsKwaZulu-Natal, South Africa
    1032.4×
  53. 52Abujalow-cost sensorsFCT, Nigeria
    1032.4×
  54. 54Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1022.4×
  55. 55BelmopanCayo District, Belize
    1012.4×
  56. 56EdinburgTexas, United States
    1002.4×
  57. 57Heroica MatamorosTamaulipas, Mexico
    982.3×
  58. 58CoquimboCoquimbo Region, Chile
    972.3×
  59. 59LimaLima Province, Peru
    952.2×
  60. 60VillarricaAraucania, Chile
    932.1×
  61. 61KaohsiungTakao, Taiwan
    932.1×
  62. 62Civitanova MarcheThe Marches, Italy
    932.1×
  63. 63HanoiHanoi, Vietnam
    922.1×
  64. 64PátraWest Greece, Greece
    922.1×
  65. 64Mae SaiChiang Rai, Thailand
    922.1×
  66. 64CopiapóAtacama, Chile
    922.1×
  67. 67AthensAttica, Greece
    912.1×
  68. 68TalcahuanoBiobio, Chile
    912.0×
  69. 69NaplesCampania, Italy
    902.0×
  70. 69AcerraCampania, Italy
    902.0×
  71. 71Falconara MarittimaThe Marches, Italy
    902.0×
  72. 72YuanlinTaiwan, Taiwan
    902.0×
  73. 72SarajevoFederation of B&H, Bosnia and Herzegovina
    902.0×
  74. 72Corpus ChristiTexas, United States
    902.0×
  75. 75JeddahMecca Region, Saudi Arabia
    892.0×
  76. 75Quezon Citylow-cost sensorsNational Capital Region, Philippines
    892.0×
  77. 77ConcepciónBiobio, Chile
    892.0×
  78. 78San Luis de la PazGuanajuato, Mexico
    892.0×
  79. 79TratTrat, Thailand
    892.0×
  80. 80ValdiviaLos Ríos Region, Chile
    881.9×
  81. 81ChaozhouTaiwan, Taiwan
    881.9×
  82. 82AntofagastaAntofagasta, Chile
    871.9×
  83. 83Chiayi CityTaiwan, Taiwan
    861.9×
  84. 84ChiguayanteBiobio, Chile
    861.9×
  85. 85XinyingTaiwan, Taiwan
    861.8×
  86. 85FabrianoThe Marches, Italy
    861.8×
  87. 87Puerto VarasLos Lagos Region, Chile
    851.8×
  88. 88Puerto MonttLos Lagos Region, Chile
    851.8×
  89. 89AsprópyrgosAttica, Greece
    841.8×
  90. 90Addis AbabaAddis Ababa, Ethiopia
    841.8×
  91. 91SalernoCampania, Italy
    841.8×
  92. 92BeigangTaiwan, Taiwan
    841.8×
  93. 93IrapuatoGuanajuato, Mexico
    821.7×
  94. 94Silao de la VictoriaGuanajuato, Mexico
    811.7×
  95. 95UttaraditUttaradit, Thailand
    811.7×
  96. 96Ubon RatchathaniUbon Ratchathani, Thailand
    801.7×
  97. 97Islamabadlow-cost sensorsIslamabad, Pakistan
    801.6×
  98. 97XizhouTaiwan, Taiwan
    801.6×
  99. 97León de los AldamaGuanajuato, Mexico
    801.6×
  100. 100TlaquepaqueJalisco, Mexico
    801.6×
  101. 101SangjuGyeongsangbuk-do, South Korea
    791.6×
  102. 102ZhushanTaiwan, Taiwan
    791.6×
  103. 102YeojuGyeonggi-do, South Korea
    791.6×
  104. 104GaryIndiana, United States
    781.6×
  105. 105PuliTaiwan, Taiwan
    781.6×
  106. 106DouliuTaiwan, Taiwan
    781.6×
  107. 106TaichungTaiwan, Taiwan
    781.6×
  108. 106Live OakTexas, United States
    781.6×
  109. 109San Francisco De BorjaLima region, Peru
    771.5×
  110. 110ToméBiobio, Chile
    771.5×
  111. 111San Pedro de la PazBiobio, Chile
    771.5×
  112. 112KalasinKalasin, Thailand
    761.5×
  113. 112Bang NaBangkok, Thailand
    761.5×
  114. 114KhalándrionAttica, Greece
    761.5×
  115. 114AcharnésAttica, Greece
    761.5×
  116. 116TournaiWallonia, Belgium
    761.5×
  117. 117San Miguel de AllendeGuanajuato, Mexico
    751.5×
  118. 118PohangGyeongsangbuk-do, South Korea
    751.5×
  119. 118MonsWallonia, Belgium
    751.5×
  120. 120IksanJeollabuk-do, South Korea
    751.5×
  121. 121GostivarGostivar, North Macedonia
    751.5×
  122. 122GuanajuatoGuanajuato, Mexico
    751.5×
  123. 123AnconaThe Marches, Italy
    741.4×
  124. 124Ceglie MessapicaApulia, Italy
    741.4×
  125. 125TetovoTetovo, North Macedonia
    741.4×
  126. 125BitolaBitola, North Macedonia
    741.4×
  127. 125NantouTaiwan, Taiwan
    741.4×
  128. 128BusanBusan, South Korea
    741.4×
  129. 129GijangBusan, South Korea
    741.4×
  130. 130KoperUrban Municipality of Koper, Slovenia
    741.4×
  131. 131AshgabatAshgabat, Turkmenistan
    731.4×
  132. 132TaibaoTaiwan, Taiwan
    731.4×
  133. 132YeongjuGyeongsangbuk-do, South Korea
    731.4×
  134. 132UlsanUlsan, South Korea
    731.4×
  135. 132Khlong Sam WaBangkok, Thailand
    731.4×
  136. 136ErlunTaiwan, Taiwan
    731.4×
  137. 136SeonghwanChungcheongnam-do, South Korea
    731.4×
  138. 136KimjeJeollabuk-do, South Korea
    731.4×
  139. 139YeonggwangJeollanam-do, South Korea
    721.4×
  140. 139BuanJeollabuk-do, South Korea
    721.4×
  141. 141KoesanNorth Chungcheong, South Korea
    721.4×
  142. 142PiraeusAttica, Greece
    721.4×
  143. 142BakuBaki, Azerbaijan
    721.4×
  144. 142HokotaIbaraki, Japan
    721.4×
  145. 142LochristiFlanders, Belgium
    721.4×
  146. 146BuziTaiwan, Taiwan
    711.3×
  147. 146UngsangGyeongsangnam-do, South Korea
    711.3×
  148. 148KanchanaburiKanchanaburi, Thailand
    711.3×
  149. 148Wan ChaiWan Chai, Hong Kong
    711.3×
  150. 148PyeongtaekGyeonggi-do, South Korea
    711.3×
  151. 151Amnat CharoenAmnat Charoen, Thailand
    711.3×
  152. 151JungpyongNorth Chungcheong, South Korea
    711.3×
  153. 151TocopillaAntofagasta, Chile
    711.3×
  154. 154YecheonGyeongsangbuk-do, South Korea
    711.3×
  155. 154PubalGyeonggi-do, South Korea
    711.3×
  156. 156WŏnjuGangwon-do, South Korea
    701.3×
  157. 157ToruńKujawsko-Pomorskie, Poland
    701.3×
  158. 157PesaroThe Marches, Italy
    701.3×
  159. 157AlessandriaPiedmont, Italy
    701.3×
  160. 160SkopjeGrad Skopje, North Macedonia
    691.3×
  161. 160PhayaoPhayao, Thailand
    691.3×
  162. 160MiaoliTaiwan, Taiwan
    691.3×
  163. 160AndongGyeongsangbuk-do, South Korea
    691.3×
  164. 164Karachilow-cost sensorsSindh, Pakistan
    691.3×
  165. 164KimhaeGyeongsangnam-do, South Korea
    691.3×
  166. 166ChungjuNorth Chungcheong, South Korea
    691.2×
  167. 166ChangwonGyeongsangnam-do, South Korea
    691.2×
  168. 166YŏnmuChungcheongnam-do, South Korea
    691.2×
  169. 166KortrijkFlanders, Belgium
    691.2×
  170. 170BorCentral Serbia, Serbia
    691.2×
  171. 170LjubljanaLjubljana, Slovenia
    691.2×
  172. 170AustinTexas, United States
    691.2×
  173. 173Gimpo-siGyeonggi-do, South Korea
    691.2×
  174. 173ŌmutaFukuoka, Japan
    691.2×
  175. 173San AntonioTexas, United States
    691.2×
  176. 176ZwijndrechtFlanders, Belgium
    681.2×
  177. 176CapannoriTuscany, Italy
    681.2×
  178. 178Ban Samae DamBangkok, Thailand
    681.2×
  179. 178YesanChungcheongnam-do, South Korea
    681.2×
  180. 178Kanzakimachi-kanzakiSaga, Japan
    681.2×
  181. 178MenenFlanders, Belgium
    681.2×
  182. 178ConroeTexas, United States
    681.2×
  183. 183LampangLampang, Thailand
    681.2×
  184. 183CheorwonGangwon-do, South Korea
    681.2×
  185. 183ChangnyeongGyeongsangnam-do, South Korea
    681.2×
  186. 186AsanChungcheongnam-do, South Korea
    681.2×
  187. 186Icheon-siGyeonggi-do, South Korea
    681.2×
  188. 188Udon ThaniUdon Thani, Thailand
    681.2×
  189. 188YeongdongNorth Chungcheong, South Korea
    681.2×
  190. 188TangjinChungcheongnam-do, South Korea
    681.2×
  191. 188GoseongGyeongsangnam-do, South Korea
    681.2×
  192. 188HayangGyeongsangbuk-do, South Korea
    681.2×
  193. 188Chinch'ŏnNorth Chungcheong, South Korea
    681.2×
  194. 194Nakhon RatchasimaNakhon Ratchasima, Thailand
    671.2×
  195. 194NaesŏGyeongsangnam-do, South Korea
    671.2×
  196. 194GrimbergenFlanders, Belgium
    671.2×
  197. 194Novo MestoUrban Municipality of Novo Mesto, Slovenia
    671.2×
  198. 198YeonilGyeongsangbuk-do, South Korea
    671.2×
  199. 198Cheongju-siNorth Chungcheong, South Korea
    671.2×
  200. 198OurenseGalicia, Spain
    671.2×

Top 200 of 2,299 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, May 20, 2024, smogrank.com/history/2024-05-20 (accessed 3 Oct 2026).

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