SmogRank / History / September 21, 2024

Most polluted cities on September 21, 2024

1,756 cities ranked by their average PM2.5 over the day; the worst was Kampala, Uganda, at 123.0 µg/m³. Each city's own local calendar day.

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

← Kampala 123.0 µg/m³ 100 µg/m³15 WHO 24-hour guideline
Every city ranked for September 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. 1Kampalalow-cost sensorsCentral Region, Uganda
    1988.2×
  2. 2Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1665.1×
  3. 3DushanbeDushanbe, Tajikistan
    1644.9×
  4. 4Kinshasalow-cost sensorsKinshasa, Democratic Republic of the Congo
    1634.9×
  5. 5Lahorelow-cost sensorsPunjab, Pakistan
    1634.8×
  6. 6JakartaJakarta, Indonesia
    1554.1×
  7. 7Santa Anita - Los FicusLima region, Peru
    1544.0×
  8. 8BaghdadBaghdad, Iraq
    1543.9×
  9. 9CoyhaiqueAysén, Chile
    1313.2×
  10. 10Islamabadlow-cost sensorsIslamabad, Pakistan
    1253.0×
  11. 11RancaguaO'Higgins Region, Chile
    1212.9×
  12. 12LimaLima Province, Peru
    1192.9×
  13. 13Iloilolow-cost sensorsWestern Visayas, Philippines
    1192.8×
  14. 14Puente AltoSantiago Metropolitan, Chile
    1152.7×
  15. 15KaliszGreater Poland, Poland
    1102.6×
  16. 16AshgabatAshgabat, Turkmenistan
    1072.5×
  17. 17Dhakalow-cost sensorsDhaka Division, Bangladesh
    1032.4×
  18. 18ŁaskŁódź Voivodeship, Poland
    1022.4×
  19. 19StarachowiceŚwiętokrzyskie, Poland
    992.3×
  20. 20KościanGreater Poland, Poland
    972.3×
  21. 21LublinLublin, Poland
    962.2×
  22. 22KielceŚwiętokrzyskie, Poland
    952.2×
  23. 23ŁukówLublin, Poland
    952.2×
  24. 24DelhiDelhi, India
    952.2×
  25. 25YanacanchaPasco, Peru
    952.2×
  26. 26RadomskoŁódź Voivodeship, Poland
    952.2×
  27. 27MielecSubcarpathia, Poland
    942.2×
  28. 28AntananarivoAnalamanga, Madagascar
    932.1×
  29. 29CuranilahueBiobio, Chile
    932.1×
  30. 30San Francisco De BorjaLima region, Peru
    922.1×
  31. 31RengoO'Higgins Region, Chile
    922.1×
  32. 32Jacobo HunterArequipa, Peru
    912.0×
  33. 33Villa Poeta José Gálvez BarrenecheaLima region, Peru
    902.0×
  34. 34KutnoŁódź Voivodeship, Poland
    892.0×
  35. 35ChennaiTamil Nadu, India
    892.0×
  36. 36OtwockMazovia, Poland
    881.9×
  37. 36ZgierzŁódź Voivodeship, Poland
    881.9×
  38. 38Şabāḩ as SālimMubārak al Kabīr, Kuwait
    871.9×
  39. 39CairoCairo, Egypt
    871.9×
  40. 39SmederevoCentral Serbia, Serbia
    871.9×
  41. 39KolkataWest Bengal, India
    871.9×
  42. 42Puerto AysénAysén, Chile
    861.9×
  43. 43SantiagoSantiago Metropolitan, Chile
    861.9×
  44. 44ZamośćLublin, Poland
    861.8×
  45. 45KigaliKigali, Rwanda
    851.8×
  46. 45PoznańGreater Poland, Poland
    851.8×
  47. 47ŻyrardówMazovia, Poland
    851.8×
  48. 48JarosławSubcarpathia, Poland
    851.8×
  49. 49PruszkówMazovia, Poland
    851.8×
  50. 50PrzemyślSubcarpathia, Poland
    851.8×
  51. 51GrajewoPodlasie, Poland
    851.8×
  52. 52HualpénBiobio, Chile
    841.8×
  53. 53Banja LukaSrpska, Bosnia and Herzegovina
    841.8×
  54. 54RadomMazovia, Poland
    831.8×
  55. 54BydgoszczKujawsko-Pomorskie, Poland
    831.8×
  56. 56WłocławekKujawsko-Pomorskie, Poland
    831.7×
  57. 57SzczecinWest Pomerania, Poland
    821.7×
  58. 58Gorzów WielkopolskiLubusz, Poland
    821.7×
  59. 59AntofagastaAntofagasta, Chile
    821.7×
  60. 60CuricóMaule Region, Chile
    811.7×
  61. 61AlgiersAlgiers, Algeria
    811.7×
  62. 62Bang NaBangkok, Thailand
    811.7×
  63. 62DartfordEngland, United Kingdom
    811.7×
  64. 64RzeszówSubcarpathia, Poland
    801.7×
  65. 64Kingston upon HullEngland, United Kingdom
    801.7×
  66. 66DębicaSubcarpathia, Poland
    791.6×
  67. 67NiskoSubcarpathia, Poland
    791.6×
  68. 68Skarżysko-KamiennaŚwiętokrzyskie, Poland
    791.6×
  69. 68CanterburyEngland, United Kingdom
    791.6×
  70. 70Konstancin-JeziornaMazovia, Poland
    781.6×
  71. 70Birminghamlow-cost sensorsEngland, United Kingdom
    781.6×
  72. 70Zielona GóraLubusz, Poland
    781.6×
  73. 73Debrecenlow-cost sensorsHajdú-Bihar, Hungary
    781.6×
  74. 74N'DjamenaN’Djaména, Chad
    771.6×
  75. 74ŁódźŁódź Voivodeship, Poland
    771.6×
  76. 76Samut SakhonSamut Sakhon, Thailand
    771.5×
  77. 76ManchesterEngland, United Kingdom
    771.5×
  78. 76San ClementeIca, Peru
    771.5×
  79. 79WarsawMazovia, Poland
    771.5×
  80. 79LegionowoMazovia, Poland
    771.5×
  81. 79Canvey IslandEngland, United Kingdom
    771.5×
  82. 82LondonEngland, United Kingdom
    771.5×
  83. 82HualquiBiobio, Chile
    771.5×
  84. 82CallaoCallao, Peru
    771.5×
  85. 85NewmarketEngland, United Kingdom
    761.5×
  86. 85QuinteroValparaiso, Chile
    761.5×
  87. 85CoronelBiobio, Chile
    761.5×
  88. 88Clacton-on-SeaEngland, United Kingdom
    761.5×
  89. 88ToruńKujawsko-Pomorskie, Poland
    761.5×
  90. 88Asunciónlow-cost sensorsAsuncion, Paraguay
    761.5×
  91. 91TarnówLesser Poland, Poland
    761.5×
  92. 92Kathmandulow-cost sensorsBagmati Province, Nepal
    751.5×
  93. 93PlymouthEngland, United Kingdom
    751.5×
  94. 93BexleyEngland, United Kingdom
    751.5×
  95. 93KłodzkoLower Silesia, Poland
    751.5×
  96. 96BiałystokPodlasie, Poland
    751.5×
  97. 96HanoiHanoi, Vietnam
    751.5×
  98. 96SheffieldEngland, United Kingdom
    751.5×
  99. 96Royal Leamington SpaEngland, United Kingdom
    751.5×
  100. 96KatowiceSilesia, Poland
    751.5×
  101. 101ChesterfieldEngland, United Kingdom
    751.5×
  102. 102Jastrzębie ZdrójSilesia, Poland
    751.5×
  103. 103RacibórzSilesia, Poland
    741.4×
  104. 104Stoke-on-TrentEngland, United Kingdom
    741.4×
  105. 104PłockMazovia, Poland
    741.4×
  106. 106OlsztynWarmia-Masuria, Poland
    741.4×
  107. 106PortsmouthEngland, United Kingdom
    741.4×
  108. 108Nong KhaemBangkok, Thailand
    731.4×
  109. 108TocopillaAntofagasta, Chile
    731.4×
  110. 110NacimientoBiobio, Chile
    731.4×
  111. 110YauriCuzco Department, Peru
    731.4×
  112. 110High PeakEngland, United Kingdom
    731.4×
  113. 113Quezon Citylow-cost sensorsNational Capital Region, Philippines
    731.4×
  114. 113The HagueSouth Holland, The Netherlands
    731.4×
  115. 115HayesEngland, United Kingdom
    731.4×
  116. 116ReadingEngland, United Kingdom
    731.4×
  117. 116QuillotaValparaiso, Chile
    731.4×
  118. 118NewportWales, United Kingdom
    721.4×
  119. 118LiverpoolEngland, United Kingdom
    721.4×
  120. 118VillarricaAraucania, Chile
    721.4×
  121. 121Ban Samae DamBangkok, Thailand
    721.4×
  122. 121CoquimboCoquimbo Region, Chile
    721.4×
  123. 123OxfordEngland, United Kingdom
    721.4×
  124. 123KrakówLesser Poland, Poland
    721.4×
  125. 123GdańskPomerania, Poland
    721.4×
  126. 126ZemunCentral Serbia, Serbia
    721.4×
  127. 126NorwichEngland, United Kingdom
    721.4×
  128. 126La SerenaCoquimbo Region, Chile
    721.4×
  129. 129GdyniaPomerania, Poland
    721.3×
  130. 130Ulan BatorUlaanbaatar, Mongolia
    711.3×
  131. 130Puerto VarasLos Lagos Region, Chile
    711.3×
  132. 130OsornoLos Lagos Region, Chile
    711.3×
  133. 133BarnstapleEngland, United Kingdom
    711.3×
  134. 133BarnsleyEngland, United Kingdom
    711.3×
  135. 133ElblągWarmia-Masuria, Poland
    711.3×
  136. 133CopiapóAtacama, Chile
    711.3×
  137. 133Khlong Sam WaBangkok, Thailand
    711.3×
  138. 138AndoverEngland, United Kingdom
    711.3×
  139. 138ConcónValparaiso, Chile
    711.3×
  140. 140PułtuskMazovia, Poland
    711.3×
  141. 140DziałdowoWarmia-Masuria, Poland
    711.3×
  142. 140KołobrzegWest Pomerania, Poland
    711.3×
  143. 143ObrenovacCentral Serbia, Serbia
    711.3×
  144. 143Cheadle HulmeEngland, United Kingdom
    711.3×
  145. 143CardiffWales, United Kingdom
    711.3×
  146. 143BirminghamAlabama, United States
    711.3×
  147. 147GraysEngland, United Kingdom
    701.3×
  148. 147ChillánÑuble, Chile
    701.3×
  149. 149Wan ChaiWan Chai, Hong Kong
    701.3×
  150. 150Khlong LuangPathum Thani, Thailand
    701.3×
  151. 151SouthamptonEngland, United Kingdom
    701.3×
  152. 151LeedsEngland, United Kingdom
    701.3×
  153. 151BredaNorth Brabant, The Netherlands
    701.3×
  154. 154AugustówPodlasie, Poland
    691.3×
  155. 154AricaArica y Parinacota Region, Chile
    691.3×
  156. 156HyderabadTelangana, India
    691.3×
  157. 156Kędzierzyn-KoźleOpole Voivodeship, Poland
    691.3×
  158. 156MiltonOntario, Canada
    691.3×
  159. 159BrightonEngland, United Kingdom
    691.3×
  160. 159QuilpuéValparaiso, Chile
    691.3×
  161. 161WawerMazovia, Poland
    691.2×
  162. 162ĆuprijaCentral Serbia, Serbia
    691.2×
  163. 163WiganEngland, United Kingdom
    691.2×
  164. 163BiggleswadeEngland, United Kingdom
    691.2×
  165. 163Bielsko-BialaSilesia, Poland
    691.2×
  166. 166KrosnoSubcarpathia, Poland
    681.2×
  167. 166Novi SadVojvodina, Serbia
    681.2×
  168. 168GillinghamEngland, United Kingdom
    681.2×
  169. 169SeafordEngland, United Kingdom
    681.2×
  170. 169BristolEngland, United Kingdom
    681.2×
  171. 169CauquenesMaule Region, Chile
    681.2×
  172. 172OpoleOpole Voivodeship, Poland
    681.2×
  173. 172KościerzynaPomerania, Poland
    681.2×
  174. 172Viña del MarValparaiso, Chile
    681.2×
  175. 175Yerevanlow-cost sensorsYerevan, Armenia
    671.2×
  176. 175Puerto MonttLos Lagos Region, Chile
    671.2×
  177. 175HamiltonOntario, Canada
    671.2×
  178. 178Phra PradaengSamut Prakan, Thailand
    671.2×
  179. 178Winterthurlow-cost sensorsZurich, Switzerland
    671.2×
  180. 180MumbaiMaharashtra, India
    671.2×
  181. 180WrocławLower Silesia, Poland
    671.2×
  182. 180ChocopeLa Libertad, Peru
    671.2×
  183. 180Little RockArkansas, United States
    671.2×
  184. 184LazarevacCentral Serbia, Serbia
    671.2×
  185. 184TilburgNorth Brabant, The Netherlands
    671.2×
  186. 184Los ÁngelesBiobio, Chile
    671.2×
  187. 187Jurong WestSingapore
    661.2×
  188. 187TalaganteSantiago Metropolitan, Chile
    661.2×
  189. 189DagenhamEngland, United Kingdom
    661.2×
  190. 189MaarssenUtrecht, The Netherlands
    661.2×
  191. 189CalamaAntofagasta, Chile
    661.2×
  192. 192IrlamEngland, United Kingdom
    661.1×
  193. 193PrestonEngland, United Kingdom
    661.1×
  194. 194KraljevoCentral Serbia, Serbia
    661.1×
  195. 195BytówPomerania, Poland
    661.1×
  196. 196RotterdamSouth Holland, The Netherlands
    651.1×
  197. 196Santa ClaritaCalifornia, United States
    651.1×
  198. 198Czechowice-DziedziceSilesia, Poland
    651.1×
  199. 198BramptonOntario, Canada
    651.1×
  200. 200WarringtonEngland, United Kingdom
    651.1×

Top 200 of 1,756 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, September 21, 2024, smogrank.com/history/2024-09-21 (accessed 3 Oct 2026).

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