SmogRank / History / September 18, 2024

Most polluted cities on September 18, 2024

1,709 cities ranked by their average PM2.5 over the day; the worst was Osorno, Chile, at 90.6 µg/m³. Each city's own local calendar day.

Bad-air episodes during September 18, 2024. All episodes.

← Osorno 90.6 µg/m³ 90 µg/m³15 WHO 24-hour guideline
Every city ranked for September 18, 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. 1OsornoLos Lagos Region, Chile
    1766.0×
  2. 2Lahorelow-cost sensorsPunjab, Pakistan
    1715.6×
  3. 3Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1705.5×
  4. 4VillarricaAraucania, Chile
    1624.8×
  5. 5AntananarivoAnalamanga, Madagascar
    1624.7×
  6. 6HualpénBiobio, Chile
    1614.7×
  7. 7Kinshasalow-cost sensorsKinshasa, Democratic Republic of the Congo
    1594.5×
  8. 8Dhakalow-cost sensorsDhaka Division, Bangladesh
    1594.5×
  9. 9DushanbeDushanbe, Tajikistan
    1554.1×
  10. 10Puerto VarasLos Lagos Region, Chile
    1523.8×
  11. 11ValdiviaLos Ríos Region, Chile
    1393.4×
  12. 12JakartaJakarta, Indonesia
    1333.2×
  13. 13Islamabadlow-cost sensorsIslamabad, Pakistan
    1263.0×
  14. 14StarachowiceŚwiętokrzyskie, Poland
    1182.8×
  15. 15RacibórzSilesia, Poland
    1162.8×
  16. 16HyderabadTelangana, India
    1152.7×
  17. 17Puerto MonttLos Lagos Region, Chile
    1132.7×
  18. 18SantiagoSantiago Metropolitan, Chile
    1122.7×
  19. 19KigaliKigali, Rwanda
    1092.6×
  20. 20RengoO'Higgins Region, Chile
    1062.5×
  21. 21HualquiBiobio, Chile
    1062.5×
  22. 22ElblągWarmia-Masuria, Poland
    1052.5×
  23. 23Santa Anita - Los FicusLima region, Peru
    1052.5×
  24. 24RancaguaO'Higgins Region, Chile
    1042.4×
  25. 25NacimientoBiobio, Chile
    1042.4×
  26. 26CoyhaiqueAysén, Chile
    1032.4×
  27. 27Kędzierzyn-KoźleOpole Voivodeship, Poland
    1012.4×
  28. 28CuranilahueBiobio, Chile
    1002.4×
  29. 29MielecSubcarpathia, Poland
    992.3×
  30. 30KielceŚwiętokrzyskie, Poland
    992.3×
  31. 30Zielona GóraLubusz, Poland
    992.3×
  32. 30Puente AltoSantiago Metropolitan, Chile
    992.3×
  33. 33TalcahuanoBiobio, Chile
    992.3×
  34. 34MaputoMaputo City, Mozambique
    972.3×
  35. 35CoronelBiobio, Chile
    972.2×
  36. 36Jastrzębie ZdrójSilesia, Poland
    972.2×
  37. 37SzczecinWest Pomerania, Poland
    962.2×
  38. 38KatowiceSilesia, Poland
    962.2×
  39. 39CuricóMaule Region, Chile
    962.2×
  40. 40QuillotaValparaiso, Chile
    962.2×
  41. 41KościerzynaPomerania, Poland
    942.1×
  42. 42La UniónLos Ríos Region, Chile
    942.1×
  43. 43Bang NaBangkok, Thailand
    932.1×
  44. 44Los ÁngelesBiobio, Chile
    932.1×
  45. 45Jacobo HunterArequipa, Peru
    922.1×
  46. 46Skarżysko-KamiennaŚwiętokrzyskie, Poland
    922.1×
  47. 47LublinLublin, Poland
    912.0×
  48. 48TemucoAraucania, Chile
    912.0×
  49. 49PruszkówMazovia, Poland
    902.0×
  50. 50ToruńKujawsko-Pomorskie, Poland
    902.0×
  51. 51WrocławLower Silesia, Poland
    902.0×
  52. 52KaliszGreater Poland, Poland
    892.0×
  53. 53DelhiDelhi, India
    892.0×
  54. 53HanoiHanoi, Vietnam
    892.0×
  55. 53Strzelce OpolskieOpole Voivodeship, Poland
    892.0×
  56. 53PoznańGreater Poland, Poland
    892.0×
  57. 57OpoleOpole Voivodeship, Poland
    892.0×
  58. 57KościanGreater Poland, Poland
    892.0×
  59. 59TalaganteSantiago Metropolitan, Chile
    892.0×
  60. 59CopiapóAtacama, Chile
    892.0×
  61. 61BydgoszczKujawsko-Pomorskie, Poland
    881.9×
  62. 62Puerto AysénAysén, Chile
    881.9×
  63. 63ZgierzŁódź Voivodeship, Poland
    871.9×
  64. 63ŁaskŁódź Voivodeship, Poland
    871.9×
  65. 65BytówPomerania, Poland
    871.9×
  66. 65QuilpuéValparaiso, Chile
    871.9×
  67. 67ChillánÑuble, Chile
    871.9×
  68. 67San Pedro de la PazBiobio, Chile
    871.9×
  69. 69Gorzów WielkopolskiLubusz, Poland
    861.9×
  70. 70OlsztynWarmia-Masuria, Poland
    851.8×
  71. 71BeijingBeijing, China
    851.8×
  72. 72ChiguayanteBiobio, Chile
    851.8×
  73. 73QuinteroValparaiso, Chile
    841.8×
  74. 74GrajewoPodlasie, Poland
    841.8×
  75. 74KłodzkoLower Silesia, Poland
    841.8×
  76. 76YuanlinTaiwan, Taiwan
    841.8×
  77. 77ŻyrardówMazovia, Poland
    831.8×
  78. 77RadomMazovia, Poland
    831.8×
  79. 77CauquenesMaule Region, Chile
    831.8×
  80. 80RadomskoŁódź Voivodeship, Poland
    831.7×
  81. 81AntofagastaAntofagasta, Chile
    831.7×
  82. 82San Francisco De BorjaLima region, Peru
    821.7×
  83. 83CairoCairo, Egypt
    821.7×
  84. 84ZamośćLublin, Poland
    821.7×
  85. 85TalcaMaule Region, Chile
    821.7×
  86. 86MumbaiMaharashtra, India
    811.7×
  87. 86KrakówLesser Poland, Poland
    811.7×
  88. 88NiskoSubcarpathia, Poland
    811.7×
  89. 88ToméBiobio, Chile
    811.7×
  90. 88CoquimboCoquimbo Region, Chile
    811.7×
  91. 91WłocławekKujawsko-Pomorskie, Poland
    811.7×
  92. 92KolkataWest Bengal, India
    801.7×
  93. 93ŁódźŁódź Voivodeship, Poland
    801.7×
  94. 94Nepeanlow-cost sensorsOntario, Canada
    801.6×
  95. 95Czechowice-DziedziceSilesia, Poland
    801.6×
  96. 96ConcepciónBiobio, Chile
    791.6×
  97. 97Konstancin-JeziornaMazovia, Poland
    791.6×
  98. 98La SerenaCoquimbo Region, Chile
    791.6×
  99. 99Viña del MarValparaiso, Chile
    781.6×
  100. 99ConcónValparaiso, Chile
    781.6×
  101. 101Şabāḩ as SālimMubārak al Kabīr, Kuwait
    781.6×
  102. 101ZhushanTaiwan, Taiwan
    781.6×
  103. 103Khlong Sam WaBangkok, Thailand
    781.6×
  104. 104ChennaiTamil Nadu, India
    771.6×
  105. 105Jelenia GóraLower Silesia, Poland
    771.5×
  106. 106LazarevacCentral Serbia, Serbia
    771.5×
  107. 107HeerlenLimburg, The Netherlands
    771.5×
  108. 107CallaoCallao, Peru
    771.5×
  109. 109Khan Na YaoBangkok, Thailand
    771.5×
  110. 110ŁukówLublin, Poland
    761.5×
  111. 111DouliuTaiwan, Taiwan
    761.5×
  112. 112TocopillaAntofagasta, Chile
    761.5×
  113. 113WarsawMazovia, Poland
    751.5×
  114. 114SarajevoFederation of B&H, Bosnia and Herzegovina
    751.5×
  115. 115OtwockMazovia, Poland
    741.4×
  116. 115DębicaSubcarpathia, Poland
    741.4×
  117. 115KutnoŁódź Voivodeship, Poland
    741.4×
  118. 118ObrenovacCentral Serbia, Serbia
    741.4×
  119. 118XinyingTaiwan, Taiwan
    741.4×
  120. 120Debrecenlow-cost sensorsHajdú-Bihar, Hungary
    741.4×
  121. 120ŻaryLubusz, Poland
    741.4×
  122. 120CalamaAntofagasta, Chile
    741.4×
  123. 123LegionowoMazovia, Poland
    741.4×
  124. 123Kathmandulow-cost sensorsBagmati Province, Nepal
    741.4×
  125. 125TarnówLesser Poland, Poland
    731.4×
  126. 125AugustówPodlasie, Poland
    731.4×
  127. 125GdyniaPomerania, Poland
    731.4×
  128. 125Villa Poeta José Gálvez BarrenecheaLima region, Peru
    731.4×
  129. 129Nong KhaemBangkok, Thailand
    731.4×
  130. 130MiskolcBorsod-Abaúj-Zemplén, Hungary
    731.4×
  131. 130BelgradeCentral Serbia, Serbia
    731.4×
  132. 132TaichungTaiwan, Taiwan
    731.4×
  133. 133ZemunCentral Serbia, Serbia
    721.4×
  134. 133AricaArica y Parinacota Region, Chile
    721.4×
  135. 135ErlunTaiwan, Taiwan
    721.4×
  136. 136Lak SiBangkok, Thailand
    721.4×
  137. 137YanacanchaPasco, Peru
    721.3×
  138. 138GdańskPomerania, Poland
    711.3×
  139. 139BeigangTaiwan, Taiwan
    711.3×
  140. 140PančevoVojvodina, Serbia
    711.3×
  141. 141BangkokBangkok, Thailand
    711.3×
  142. 141ShanghaiShanghai, China
    711.3×
  143. 141BredaNorth Brabant, The Netherlands
    711.3×
  144. 144LotaBiobio, Chile
    701.3×
  145. 145TilburgNorth Brabant, The Netherlands
    701.3×
  146. 146Bielsko-BialaSilesia, Poland
    691.3×
  147. 147DziałdowoWarmia-Masuria, Poland
    691.3×
  148. 147EindhovenNorth Brabant, The Netherlands
    691.3×
  149. 149Alto HospicioTarapacá, Chile
    691.2×
  150. 150WawerMazovia, Poland
    691.2×
  151. 150ChikuseiIbaraki, Japan
    691.2×
  152. 152Novi SadVojvodina, Serbia
    691.2×
  153. 153NantouTaiwan, Taiwan
    681.2×
  154. 153Iloilolow-cost sensorsWestern Visayas, Philippines
    681.2×
  155. 155BiałystokPodlasie, Poland
    681.2×
  156. 155Novi PazarCentral Serbia, Serbia
    681.2×
  157. 157BuziTaiwan, Taiwan
    681.2×
  158. 158NijmegenGelderland, The Netherlands
    681.2×
  159. 159BorCentral Serbia, Serbia
    681.2×
  160. 159PłockMazovia, Poland
    681.2×
  161. 159Bueng KumBangkok, Thailand
    681.2×
  162. 162ĆuprijaCentral Serbia, Serbia
    671.2×
  163. 163SremčicaCentral Serbia, Serbia
    671.2×
  164. 163Sai MaiBangkok, Thailand
    671.2×
  165. 165EłkWarmia-Masuria, Poland
    671.2×
  166. 166ChocopeLa Libertad, Peru
    671.2×
  167. 167ChanghuaTaiwan, Taiwan
    671.2×
  168. 167MaarssenUtrecht, The Netherlands
    671.2×
  169. 169TsuchiuraIbaraki, Japan
    661.2×
  170. 170ErlinTaiwan, Taiwan
    661.2×
  171. 170BarneveldGelderland, The Netherlands
    661.2×
  172. 170ValjevoCentral Serbia, Serbia
    661.2×
  173. 173SmederevoCentral Serbia, Serbia
    661.1×
  174. 173KraljevoCentral Serbia, Serbia
    661.1×
  175. 175RzeszówSubcarpathia, Poland
    651.1×
  176. 175TaibaoTaiwan, Taiwan
    651.1×
  177. 175UžiceCentral Serbia, Serbia
    651.1×
  178. 178JarosławSubcarpathia, Poland
    651.1×
  179. 178XizhouTaiwan, Taiwan
    651.1×
  180. 178Wan ChaiWan Chai, Hong Kong
    651.1×
  181. 178YauriCuzco Department, Peru
    651.1×
  182. 182PułtuskMazovia, Poland
    651.1×
  183. 183PuliTaiwan, Taiwan
    651.1×
  184. 184Bang KapiBangkok, Thailand
    641.1×
  185. 184Chiayi CityTaiwan, Taiwan
    641.1×
  186. 184EnschedeOverijssel, The Netherlands
    641.1×
  187. 184San ClementeIca, Peru
    641.1×
  188. 188PrzemyślSubcarpathia, Poland
    641.1×
  189. 188The HagueSouth Holland, The Netherlands
    641.1×
  190. 190Nong ChokBangkok, Thailand
    641.1×
  191. 190N'DjamenaN’Djaména, Chad
    641.1×
  192. 192AlgiersAlgiers, Algeria
    631.1×
  193. 192VenrayLimburg, The Netherlands
    631.1×
  194. 192Lat KrabangBangkok, Thailand
    631.1×
  195. 195YongkangTaiwan, Taiwan
    631.0×
  196. 196Ban Khlong PrawetBangkok, Thailand
    631.0×
  197. 196UtrechtUtrecht, The Netherlands
    631.0×
  198. 196ŚwiecieKujawsko-Pomorskie, Poland
    631.0×
  199. 199BartlettTennessee, United States
    631.0×
  200. 199MontréalQuebec, Canada
    631.0×

Top 200 of 1,709 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 18, 2024, smogrank.com/history/2024-09-18 (accessed 3 Oct 2026).

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