SmogRank / History / September 19, 2023

Most polluted cities on September 19, 2023

1,830 cities ranked by their average PM2.5 over the day; the worst was Piedras Negras, Mexico, at 986.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during September 19, 2023. All episodes.

← Piedras Negras 986.0 µg/m³ 900 µg/m³15 WHO 24-hour guideline
Every city ranked for September 19, 2023, 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. 1Piedras NegrasCoahuila, Mexico
    500+65.7×
  2. 2CoyhaiqueAysén, Chile
    1735.8×
  3. 3ReginaSaskatchewan, Canada
    1594.4×
  4. 4Puente AltoSantiago Metropolitan, Chile
    1533.9×
  5. 5Kampalalow-cost sensorsCentral Region, Uganda
    1503.7×
  6. 6SantiagoSantiago Metropolitan, Chile
    1333.2×
  7. 7Puerto VarasLos Lagos Region, Chile
    1323.2×
  8. 8JakartaJakarta, Indonesia
    1212.9×
  9. 9Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1202.9×
  10. 10DushanbeDushanbe, Tajikistan
    1182.8×
  11. 11La OrotavaCanary Islands, Spain
    1172.8×
  12. 12La UniónLos Ríos Region, Chile
    1142.7×
  13. 13Puerto AysénAysén, Chile
    1102.6×
  14. 14Lahorelow-cost sensorsPunjab, Pakistan
    1092.6×
  15. 15Addis AbabaAddis Ababa, Ethiopia
    1082.5×
  16. 16RancaguaO'Higgins Region, Chile
    1072.5×
  17. 17Puerto MonttLos Lagos Region, Chile
    1042.5×
  18. 18Şabāḩ as SālimMubārak al Kabīr, Kuwait
    1022.4×
  19. 19CoronelBiobio, Chile
    992.3×
  20. 20OsornoLos Lagos Region, Chile
    992.3×
  21. 21MexicaliBaja California, Mexico
    992.3×
  22. 22RengoO'Higgins Region, Chile
    982.3×
  23. 23PristinaPristina, Kosovo
    982.3×
  24. 24Santa Anita - Los FicusLima region, Peru
    982.3×
  25. 25San FranciscoCalifornia, United States
    942.1×
  26. 26SaskatoonSaskatchewan, Canada
    932.1×
  27. 27QuillotaValparaiso, Chile
    922.1×
  28. 28Shakaskraallow-cost sensorsKwaZulu-Natal, South Africa
    912.0×
  29. 29Little RockArkansas, United States
    902.0×
  30. 30TalaganteSantiago Metropolitan, Chile
    902.0×
  31. 31OaklandCalifornia, United States
    902.0×
  32. 32QuinteroValparaiso, Chile
    881.9×
  33. 32RichmondCalifornia, United States
    881.9×
  34. 34AnconaThe Marches, Italy
    881.9×
  35. 35Abujalow-cost sensorsFCT, Nigeria
    881.9×
  36. 36Prince AlbertSaskatchewan, Canada
    871.9×
  37. 37Dhakalow-cost sensorsDhaka Division, Bangladesh
    861.9×
  38. 38Samut SakhonSamut Sakhon, Thailand
    861.9×
  39. 38Redwood CityCalifornia, United States
    861.9×
  40. 40GuadalajaraJalisco, Mexico
    851.8×
  41. 41TemucoAraucania, Chile
    851.8×
  42. 42SarajevoFederation of B&H, Bosnia and Herzegovina
    851.8×
  43. 43HualquiBiobio, Chile
    851.8×
  44. 44MinamataKumamoto, Japan
    851.8×
  45. 45LimaLima Province, Peru
    841.8×
  46. 46KirishimaKagoshima, Japan
    831.8×
  47. 47NairobiNairobi County, Kenya
    831.8×
  48. 48San LeandroCalifornia, United States
    831.7×
  49. 49Civitanova MarcheThe Marches, Italy
    821.7×
  50. 49San RafaelCalifornia, United States
    821.7×
  51. 51KobayashiMiyazaki, Japan
    811.7×
  52. 51SalinasCalifornia, United States
    811.7×
  53. 53Fort McMurrayAlberta, Canada
    811.7×
  54. 54MiyakonojōMiyazaki, Japan
    801.7×
  55. 55HonmachiKumamoto, Japan
    801.6×
  56. 55NacimientoBiobio, Chile
    801.6×
  57. 57ConcónValparaiso, Chile
    791.6×
  58. 58CuricóMaule Region, Chile
    791.6×
  59. 58PleasantonCalifornia, United States
    791.6×
  60. 60Villa Poeta José Gálvez BarrenecheaLima region, Peru
    771.6×
  61. 60Grande PrairieAlberta, Canada
    771.6×
  62. 62ToméBiobio, Chile
    771.5×
  63. 63KelownaBritish Columbia, Canada
    771.5×
  64. 64ValdiviaLos Ríos Region, Chile
    771.5×
  65. 64AntofagastaAntofagasta, Chile
    771.5×
  66. 66BrandonManitoba, Canada
    771.5×
  67. 67San JoseCalifornia, United States
    761.5×
  68. 68XonacatlánMéxico, Mexico
    761.5×
  69. 69San CarlosÑuble, Chile
    761.5×
  70. 69MinamikyushuKagoshima, Japan
    761.5×
  71. 71HanoiHanoi, Vietnam
    761.5×
  72. 71NaplesCampania, Italy
    761.5×
  73. 73CuranilahueBiobio, Chile
    751.5×
  74. 74CopiapóAtacama, Chile
    751.5×
  75. 75Bang Bo DistrictSamut Prakan, Thailand
    751.5×
  76. 75TalcahuanoBiobio, Chile
    751.5×
  77. 77GuangzhouGuangdong, China
    741.4×
  78. 78SalorTashkent Region, Uzbekistan
    741.4×
  79. 79Almatylow-cost sensorsAlmaty, Kazakhstan
    741.4×
  80. 79BamakoBamako, Mali
    741.4×
  81. 79CoquimboCoquimbo Region, Chile
    741.4×
  82. 82Phra PradaengSamut Prakan, Thailand
    731.4×
  83. 82Quezon Citylow-cost sensorsNational Capital Region, Philippines
    731.4×
  84. 82TsurusakiOita, Japan
    731.4×
  85. 82San Francisco TlalcilalcalpanMéxico, Mexico
    731.4×
  86. 86Viña del MarValparaiso, Chile
    731.4×
  87. 87MiyazakiMiyazaki, Japan
    731.4×
  88. 87TlaquepaqueJalisco, Mexico
    731.4×
  89. 89BangkokBangkok, Thailand
    721.4×
  90. 89Kaseda-shirakameKagoshima, Japan
    721.4×
  91. 91LivermoreCalifornia, United States
    721.4×
  92. 92KagoshimaKagoshima, Japan
    721.4×
  93. 92Falconara MarittimaThe Marches, Italy
    721.4×
  94. 94La SerenaCoquimbo Region, Chile
    721.3×
  95. 95TocopillaAntofagasta, Chile
    711.3×
  96. 95ZapopanJalisco, Mexico
    711.3×
  97. 97QuilpuéValparaiso, Chile
    711.3×
  98. 97Ciudad JuárezChihuahua, Mexico
    711.3×
  99. 97ShūnanYamaguchi, Japan
    711.3×
  100. 100Ciudad ApodacaNuevo León, Mexico
    711.3×
  101. 100San Salvador TizatlalliMéxico, Mexico
    711.3×
  102. 102NagaiYamagata, Japan
    711.3×
  103. 102ConcepciónBiobio, Chile
    711.3×
  104. 102ChiguayanteBiobio, Chile
    711.3×
  105. 105DelhiDelhi, India
    711.3×
  106. 105TakanabeMiyazaki, Japan
    711.3×
  107. 107AstanaAstana, Kazakhstan
    711.3×
  108. 108IyoEhime, Japan
    701.3×
  109. 108AricaArica y Parinacota Region, Chile
    701.3×
  110. 110TolucaMéxico, Mexico
    701.3×
  111. 111AntananarivoAnalamanga, Madagascar
    701.3×
  112. 111LotaBiobio, Chile
    701.3×
  113. 113Los ÁngelesBiobio, Chile
    701.3×
  114. 113CauquenesMaule Region, Chile
    701.3×
  115. 115BendOregon, United States
    691.3×
  116. 116SaikiOita, Japan
    691.2×
  117. 117AlessandriaPiedmont, Italy
    691.2×
  118. 117SaltilloCoahuila, Mexico
    691.2×
  119. 117Santa RosaCalifornia, United States
    691.2×
  120. 120Kathmandulow-cost sensorsBagmati Province, Nepal
    691.2×
  121. 120NobeokaMiyazaki, Japan
    691.2×
  122. 120NakatsuOita, Japan
    691.2×
  123. 120Alto HospicioTarapacá, Chile
    691.2×
  124. 124ValdostaGeorgia, United States
    681.2×
  125. 125NiihamaEhime, Japan
    681.2×
  126. 125HitoyoshiKumamoto, Japan
    681.2×
  127. 127ConcordCalifornia, United States
    681.2×
  128. 128ŌitaOita, Japan
    681.2×
  129. 129Wan ChaiWan Chai, Hong Kong
    671.2×
  130. 130ŌtakeHiroshima, Japan
    671.2×
  131. 130San Pedro de la PazBiobio, Chile
    671.2×
  132. 132Islamabadlow-cost sensorsIslamabad, Pakistan
    671.2×
  133. 132ŌzuKumamoto, Japan
    671.2×
  134. 132IzumiKagoshima, Japan
    671.2×
  135. 132MatsuyamaEhime, Japan
    671.2×
  136. 136ChennaiTamil Nadu, India
    661.2×
  137. 137Samut PrakanSamut Prakan, Thailand
    661.1×
  138. 137KureHiroshima, Japan
    661.1×
  139. 137PueblaPuebla, Mexico
    661.1×
  140. 137ChillánÑuble, Chile
    661.1×
  141. 137Baton RougeLouisiana, United States
    661.1×
  142. 142Ciudad NezahualcoyotlMéxico, Mexico
    661.1×
  143. 143IwakuniYamaguchi, Japan
    661.1×
  144. 143West FargoNorth Dakota, United States
    661.1×
  145. 145KasaokaOkayama, Japan
    651.1×
  146. 145Banja LukaSrpska, Bosnia and Herzegovina
    651.1×
  147. 145HattiesburgMississippi, United States
    651.1×
  148. 145Coeur d'AleneIdaho, United States
    651.1×
  149. 149Nong KhaemBangkok, Thailand
    651.1×
  150. 149West MemphisArkansas, United States
    651.1×
  151. 151ImabariEhime, Japan
    651.1×
  152. 151KunisakiOita, Japan
    651.1×
  153. 153São PauloSão Paulo, Brazil
    651.1×
  154. 153SpokaneWashington, United States
    651.1×
  155. 155YamaguchiYamaguchi, Japan
    651.1×
  156. 155TsukumiuraOita, Japan
    651.1×
  157. 155KudamatsuYamaguchi, Japan
    651.1×
  158. 155Kan’onjichōKagawa, Japan
    651.1×
  159. 155SaijōEhime, Japan
    651.1×
  160. 155BirminghamAlabama, United States
    651.1×
  161. 155East Saint LouisIllinois, United States
    651.1×
  162. 162UtoKumamoto, Japan
    641.1×
  163. 163YanaiYamaguchi, Japan
    641.1×
  164. 163HōfuYamaguchi, Japan
    641.1×
  165. 163BeneventoCampania, Italy
    641.1×
  166. 163CalamaAntofagasta, Chile
    641.1×
  167. 167HyderabadTelangana, India
    641.1×
  168. 168TamanaKumamoto, Japan
    641.1×
  169. 168AlbanyGeorgia, United States
    641.1×
  170. 170UsukiOita, Japan
    641.1×
  171. 170MieOita, Japan
    641.1×
  172. 170OpavaMoravian-Silesian Region, Czechia
    641.1×
  173. 173SendaiKagoshima, Japan
    631.1×
  174. 173AraoKumamoto, Japan
    631.1×
  175. 175TalcaMaule Region, Chile
    631.0×
  176. 175Fort SmithArkansas, United States
    631.0×
  177. 175BrunswickGeorgia, United States
    631.0×
  178. 175MaconGeorgia, United States
    631.0×
  179. 175BartlettTennessee, United States
    631.0×
  180. 180Bishkeklow-cost sensorsBishkek, Kyrgyzstan
    631.0×
  181. 180MarugameKagawa, Japan
    631.0×
  182. 180SalamancaGuanajuato, Mexico
    631.0×
  183. 180ColumbusGeorgia, United States
    631.0×
  184. 180HernandoMississippi, United States
    631.0×
  185. 185Granite CityIllinois, United States
    631.0×
  186. 186SalernoCampania, Italy
    631.0×
  187. 186CuernavacaMorelos, Mexico
    631.0×
  188. 186DavisCalifornia, United States
    631.0×
  189. 186HyūgaMiyazaki, Japan
    631.0×
  190. 190ColomboWestern Province, Sri Lanka
    621.0×
  191. 190HiroshimaHiroshima, Japan
    621.0×
  192. 190WatertownSouth Dakota, United States
    621.0×
  193. 193ZentsujichóKagawa, Japan
    621.0×
  194. 193JacksonMississippi, United States
    621.0×
  195. 195TakasakiGunma, Japan
    621.0×
  196. 195IshinomakiMiyagi, Japan
    621.0×
  197. 195Great FallsMontana, United States
    621.0×
  198. 195BuzenFukuoka, Japan
    621.0×
  199. 199Phenix CityAlabama, United States
    621.0×
  200. 199DallasTexas, United States
    621.0×

Top 200 of 1,830 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

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SmogRank, most polluted cities, PM2.5, September 19, 2023, smogrank.com/history/2023-09-19 (accessed 2 Oct 2026).

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