SmogRank / History / May 21, 2024

Most polluted cities on May 21, 2024

2,294 cities ranked by their average PM2.5 over the day; the worst was N'Djamena, Chad, at 209.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during May 21, 2024. All episodes.

← N'Djamena 209.0 µg/m³ 200 µg/m³15 WHO 24-hour guideline
Every city ranked for May 21, 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
    28413.9×
  2. 2Abidjanlow-cost sensorsAbidjan Autonomous District, Ivory Coast
    2098.9×
  3. 3Puerto AysénAysén, Chile
    1836.7×
  4. 4Dhakalow-cost sensorsDhaka Division, Bangladesh
    1816.6×
  5. 5CairoCairo, Egypt
    1725.7×
  6. 6CoyhaiqueAysén, Chile
    1725.7×
  7. 7Lahorelow-cost sensorsPunjab, Pakistan
    1695.4×
  8. 8DelhiDelhi, India
    1675.3×
  9. 9TlaquepaqueJalisco, Mexico
    1645.0×
  10. 10HualpénBiobio, Chile
    1644.9×
  11. 11SaltilloCoahuila, Mexico
    1614.6×
  12. 12RabinalBaja Verapaz, Guatemala
    1594.5×
  13. 13Guatemala CityGuatemala, Guatemala
    1584.3×
  14. 14Santa Anita - Los FicusLima region, Peru
    1584.3×
  15. 15NacimientoBiobio, Chile
    1543.9×
  16. 16BaghdadBaghdad, Iraq
    1523.8×
  17. 17CuranilahueBiobio, Chile
    1513.7×
  18. 18Victoria de DurangoDurango, Mexico
    1503.7×
  19. 19San CarlosÑuble, Chile
    1493.7×
  20. 20CoronelBiobio, Chile
    1493.7×
  21. 21DushanbeDushanbe, Tajikistan
    1373.3×
  22. 22BelmopanCayo District, Belize
    1333.2×
  23. 23QuillotaValparaiso, Chile
    1293.1×
  24. 23CauquenesMaule Region, Chile
    1293.1×
  25. 25ChiguayanteBiobio, Chile
    1273.1×
  26. 26ChillánÑuble, Chile
    1273.1×
  27. 27OsornoLos Lagos Region, Chile
    1263.1×
  28. 28Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1212.9×
  29. 29HanoiHanoi, Vietnam
    1182.8×
  30. 30La UniónLos Ríos Region, Chile
    1172.8×
  31. 31La SerenaCoquimbo Region, Chile
    1152.8×
  32. 32MissionTexas, United States
    1122.7×
  33. 33Corpus ChristiTexas, United States
    1082.5×
  34. 34VillarricaAraucania, Chile
    1062.5×
  35. 35CuricóMaule Region, Chile
    1052.5×
  36. 36Puerto VarasLos Lagos Region, Chile
    1052.5×
  37. 37CoquimboCoquimbo Region, Chile
    1042.4×
  38. 38Gimpo-siGyeonggi-do, South Korea
    1032.4×
  39. 39EdinburgTexas, United States
    1032.4×
  40. 40TalaganteSantiago Metropolitan, Chile
    1012.4×
  41. 41IncheonIncheon, South Korea
    1012.4×
  42. 42SalamancaGuanajuato, Mexico
    1002.4×
  43. 43Addis AbabaAddis Ababa, Ethiopia
    992.3×
  44. 44SarajevoFederation of B&H, Bosnia and Herzegovina
    992.3×
  45. 45Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    992.3×
  46. 45SeonghwanChungcheongnam-do, South Korea
    992.3×
  47. 45IrapuatoGuanajuato, Mexico
    992.3×
  48. 48Heroica MatamorosTamaulipas, Mexico
    992.3×
  49. 48RancaguaO'Higgins Region, Chile
    992.3×
  50. 50BeijingBeijing, China
    982.3×
  51. 51Bucheon-siGyeonggi-do, South Korea
    972.3×
  52. 51AntofagastaAntofagasta, Chile
    972.3×
  53. 53Abujalow-cost sensorsFCT, Nigeria
    972.3×
  54. 54JeddahMecca Region, Saudi Arabia
    962.2×
  55. 55QuilpuéValparaiso, Chile
    962.2×
  56. 55Live OakTexas, United States
    962.2×
  57. 57Goyang-siGyeonggi-do, South Korea
    952.2×
  58. 58AsanChungcheongnam-do, South Korea
    952.2×
  59. 59Hwaseong-siGyeonggi-do, South Korea
    952.2×
  60. 60Islamabadlow-cost sensorsIslamabad, Pakistan
    942.1×
  61. 61TalcaMaule Region, Chile
    942.1×
  62. 62Shakaskraallow-cost sensorsKwaZulu-Natal, South Africa
    932.1×
  63. 62Los ÁngelesBiobio, Chile
    932.1×
  64. 64TemucoAraucania, Chile
    932.1×
  65. 64QuinteroValparaiso, Chile
    932.1×
  66. 64DallasTexas, United States
    932.1×
  67. 67Puerto MonttLos Lagos Region, Chile
    932.1×
  68. 68YesanChungcheongnam-do, South Korea
    922.1×
  69. 69SantiagoSantiago Metropolitan, Chile
    912.1×
  70. 70CatañoCataño, Puerto Rico
    912.0×
  71. 71AustinTexas, United States
    912.0×
  72. 72CelayaGuanajuato, Mexico
    912.0×
  73. 73TalcahuanoBiobio, Chile
    902.0×
  74. 73SaginawTexas, United States
    902.0×
  75. 75YeojuGyeonggi-do, South Korea
    902.0×
  76. 76Ansan-siGyeonggi-do, South Korea
    902.0×
  77. 77AshgabatAshgabat, Turkmenistan
    902.0×
  78. 77Kathmandulow-cost sensorsBagmati Province, Nepal
    902.0×
  79. 79Ganghwa-gunIncheon, South Korea
    902.0×
  80. 79GwangmyeongGyeonggi-do, South Korea
    902.0×
  81. 81ErlinTaiwan, Taiwan
    892.0×
  82. 81TangjinChungcheongnam-do, South Korea
    892.0×
  83. 83Anyang-siGyeonggi-do, South Korea
    871.9×
  84. 84NanNan, Thailand
    861.9×
  85. 85León de los AldamaGuanajuato, Mexico
    861.9×
  86. 86CopiapóAtacama, Chile
    861.9×
  87. 87DamyangJeollanam-do, South Korea
    861.8×
  88. 87College StationTexas, United States
    861.8×
  89. 89YeonggwangJeollanam-do, South Korea
    851.8×
  90. 89PyeongtaekGyeonggi-do, South Korea
    851.8×
  91. 91BuziTaiwan, Taiwan
    851.8×
  92. 92IksanJeollabuk-do, South Korea
    851.8×
  93. 93San Luis de la PazGuanajuato, Mexico
    851.8×
  94. 93CorsicanaTexas, United States
    851.8×
  95. 95SeoulSeoul, South Korea
    841.8×
  96. 96Mission BendTexas, United States
    841.8×
  97. 97Novi PazarCentral Serbia, Serbia
    841.8×
  98. 98XizhouTaiwan, Taiwan
    841.8×
  99. 99ConroeTexas, United States
    841.8×
  100. 100ThessaloníkiCentral Macedonia, Greece
    831.8×
  101. 100ConcepciónBiobio, Chile
    831.8×
  102. 102MostaIl-Mosta, Malta
    831.8×
  103. 103YuanlinTaiwan, Taiwan
    821.7×
  104. 103ErlunTaiwan, Taiwan
    821.7×
  105. 103HoustonTexas, United States
    821.7×
  106. 106PubalGyeonggi-do, South Korea
    821.7×
  107. 106Silao de la VictoriaGuanajuato, Mexico
    821.7×
  108. 106Fort WorthTexas, United States
    821.7×
  109. 109Icheon-siGyeonggi-do, South Korea
    821.7×
  110. 109ConcónValparaiso, Chile
    821.7×
  111. 111Missouri CityTexas, United States
    821.7×
  112. 112PátraWest Greece, Greece
    821.7×
  113. 113WanjuJeollabuk-do, South Korea
    821.7×
  114. 113San Pedro de la PazBiobio, Chile
    821.7×
  115. 115Santiago de QuerétaroQuerétaro, Mexico
    811.7×
  116. 116Uijeongbu-siGyeonggi-do, South Korea
    811.7×
  117. 116Ceglie MessapicaApulia, Italy
    811.7×
  118. 118TaylorTexas, United States
    811.7×
  119. 119ToméBiobio, Chile
    811.7×
  120. 119ChangnyeongGyeongsangnam-do, South Korea
    811.7×
  121. 121KimjeJeollabuk-do, South Korea
    801.7×
  122. 122Kampalalow-cost sensorsCentral Region, Uganda
    801.6×
  123. 123San AntonioTexas, United States
    801.6×
  124. 124OsanGyeonggi-do, South Korea
    801.6×
  125. 124Viña del MarValparaiso, Chile
    801.6×
  126. 126AbasoloGuanajuato, Mexico
    791.6×
  127. 127San MarcosTexas, United States
    791.6×
  128. 128GostivarGostivar, North Macedonia
    791.6×
  129. 128LochristiFlanders, Belgium
    791.6×
  130. 130ŌzuKumamoto, Japan
    781.6×
  131. 131JeongeupJeollabuk-do, South Korea
    781.6×
  132. 132MinamataKumamoto, Japan
    781.6×
  133. 133ĆuprijaCentral Serbia, Serbia
    781.6×
  134. 133Puente AltoSantiago Metropolitan, Chile
    781.6×
  135. 135SangjuGyeongsangbuk-do, South Korea
    771.6×
  136. 135HwasunJeollanam-do, South Korea
    771.6×
  137. 135HonmachiKumamoto, Japan
    771.6×
  138. 135ŻabbarĦaż-Żabbar, Malta
    771.6×
  139. 139Koch'angJeollabuk-do, South Korea
    771.5×
  140. 139ChanghuaTaiwan, Taiwan
    771.5×
  141. 139KortrijkFlanders, Belgium
    771.5×
  142. 142BuanJeollabuk-do, South Korea
    771.5×
  143. 142UžiceCentral Serbia, Serbia
    771.5×
  144. 144MaputoMaputo City, Mozambique
    771.5×
  145. 144Chinch'ŏnNorth Chungcheong, South Korea
    771.5×
  146. 144MifuneKumamoto, Japan
    771.5×
  147. 147MumbaiMaharashtra, India
    771.5×
  148. 147Uekimachi-mōnoKumamoto, Japan
    771.5×
  149. 149TetovoTetovo, North Macedonia
    771.5×
  150. 149Hondomachi-hondoKumamoto, Japan
    771.5×
  151. 149EvergemFlanders, Belgium
    771.5×
  152. 149LimaLima Province, Peru
    771.5×
  153. 153UtoKumamoto, Japan
    761.5×
  154. 153Tanushimarumachi-toyokiFukuoka, Japan
    761.5×
  155. 153San Pawl il-BaħarSaint Paul’s Bay, Malta
    761.5×
  156. 156NamsaJeollabuk-do, South Korea
    761.5×
  157. 156Ōyanomachi-noboritateKumamoto, Japan
    761.5×
  158. 156TournaiWallonia, Belgium
    761.5×
  159. 156GentFlanders, Belgium
    761.5×
  160. 160SuwonGyeonggi-do, South Korea
    761.5×
  161. 160KinzanChungcheongnam-do, South Korea
    761.5×
  162. 160PasadenaTexas, United States
    761.5×
  163. 163DentonTexas, United States
    751.5×
  164. 163Khlong Sam WaBangkok, Thailand
    751.5×
  165. 165Guri-siGyeonggi-do, South Korea
    751.5×
  166. 165VallettaValletta, Malta
    751.5×
  167. 167BeigangTaiwan, Taiwan
    751.5×
  168. 167YeongdongNorth Chungcheong, South Korea
    751.5×
  169. 169Karachilow-cost sensorsSindh, Pakistan
    751.5×
  170. 169ChinjuGyeongsangnam-do, South Korea
    751.5×
  171. 169Falconara MarittimaThe Marches, Italy
    751.5×
  172. 169ValdiviaLos Ríos Region, Chile
    751.5×
  173. 173GimcheonGyeongsangbuk-do, South Korea
    741.4×
  174. 173TexarkanaTexas, United States
    741.4×
  175. 175KolkataWest Bengal, India
    741.4×
  176. 176BitolaBitola, North Macedonia
    741.4×
  177. 176JeonjuJeollabuk-do, South Korea
    741.4×
  178. 176JangseongJeollanam-do, South Korea
    741.4×
  179. 176KikuchiKumamoto, Japan
    741.4×
  180. 180Almatylow-cost sensorsAlmaty, Kazakhstan
    741.4×
  181. 180NajuJeollanam-do, South Korea
    741.4×
  182. 180GwangjuGwangju, South Korea
    741.4×
  183. 183BendOregon, United States
    741.4×
  184. 184ValjevoCentral Serbia, Serbia
    731.4×
  185. 185ChangwonGyeongsangnam-do, South Korea
    731.4×
  186. 185Jacobo HunterArequipa, Peru
    731.4×
  187. 187AsprópyrgosAttica, Greece
    731.4×
  188. 187TaichungTaiwan, Taiwan
    731.4×
  189. 187IzumiKagoshima, Japan
    731.4×
  190. 190GunsanJeollabuk-do, South Korea
    731.4×
  191. 190CheonanChungcheongnam-do, South Korea
    731.4×
  192. 190TocopillaAntofagasta, Chile
    731.4×
  193. 190McAlesterOklahoma, United States
    731.4×
  194. 194ChangsuJeollabuk-do, South Korea
    731.4×
  195. 194KotōKumamoto, Japan
    731.4×
  196. 196WŏnjuGangwon-do, South Korea
    721.4×
  197. 196ŌmutaFukuoka, Japan
    721.4×
  198. 196NakatsuOita, Japan
    721.4×
  199. 196San Juan del RíoQuerétaro, Mexico
    721.4×
  200. 196GuanajuatoGuanajuato, Mexico
    721.4×

Top 200 of 2,294 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 21, 2024, smogrank.com/history/2024-05-21 (accessed 3 Oct 2026).

Download top 10 (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.