SmogRank / History / July 28, 2023

Most polluted cities on July 28, 2023

1,774 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.

← Piedras Negras 986.0 µg/m³ 900 µg/m³15 WHO 24-hour guideline
Every city ranked for July 28, 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
    2098.9×
  3. 3NacimientoBiobio, Chile
    2078.8×
  4. 4LinaresMaule Region, Chile
    1907.4×
  5. 5CuranilahueBiobio, Chile
    1897.3×
  6. 6CoronelBiobio, Chile
    1634.8×
  7. 7TalcaMaule Region, Chile
    1614.7×
  8. 8SantiagoSantiago Metropolitan, Chile
    1594.5×
  9. 9San CarlosÑuble, Chile
    1584.4×
  10. 10TalaganteSantiago Metropolitan, Chile
    1554.1×
  11. 11Los ÁngelesBiobio, Chile
    1554.0×
  12. 12HualquiBiobio, Chile
    1523.8×
  13. 13Puerto AysénAysén, Chile
    1523.8×
  14. 14Puente AltoSantiago Metropolitan, Chile
    1523.8×
  15. 15RancaguaO'Higgins Region, Chile
    1493.7×
  16. 16ChillánÑuble, Chile
    1493.7×
  17. 17RengoO'Higgins Region, Chile
    1483.6×
  18. 18TemucoAraucania, Chile
    1473.6×
  19. 19CauquenesMaule Region, Chile
    1463.6×
  20. 20CuricóMaule Region, Chile
    1403.4×
  21. 21JakartaJakarta, Indonesia
    1373.3×
  22. 22TalcahuanoBiobio, Chile
    1333.2×
  23. 23ValdiviaLos Ríos Region, Chile
    1313.2×
  24. 24QuillotaValparaiso, Chile
    1293.1×
  25. 25Santa Anita - Los FicusLima region, Peru
    1243.0×
  26. 26ToméBiobio, Chile
    1233.0×
  27. 27Lahorelow-cost sensorsPunjab, Pakistan
    1112.6×
  28. 28Dhakalow-cost sensorsDhaka Division, Bangladesh
    1082.6×
  29. 29MexicaliBaja California, Mexico
    1052.5×
  30. 30ConcepciónBiobio, Chile
    1032.4×
  31. 31ChiguayanteBiobio, Chile
    992.3×
  32. 32HanoiHanoi, Vietnam
    982.3×
  33. 33BendOregon, United States
    962.2×
  34. 34West MemphisArkansas, United States
    952.2×
  35. 35Viña del MarValparaiso, Chile
    942.2×
  36. 36QuinteroValparaiso, Chile
    932.1×
  37. 37San Pedro de la PazBiobio, Chile
    922.1×
  38. 38LotaBiobio, Chile
    922.1×
  39. 38Little RockArkansas, United States
    922.1×
  40. 40ConcónValparaiso, Chile
    892.0×
  41. 40BadgerAlaska, United States
    892.0×
  42. 42DushanbeDushanbe, Tajikistan
    881.9×
  43. 42CoquimboCoquimbo Region, Chile
    881.9×
  44. 42Ciudad JuárezChihuahua, Mexico
    881.9×
  45. 45San Francisco TlalcilalcalpanMéxico, Mexico
    881.9×
  46. 46TolucaMéxico, Mexico
    881.9×
  47. 47XonacatlánMéxico, Mexico
    871.9×
  48. 48KenmoreNew York, United States
    861.9×
  49. 49PristinaPristina, Kosovo
    861.9×
  50. 49HueytownAlabama, United States
    861.9×
  51. 51OsornoLos Lagos Region, Chile
    861.9×
  52. 52AntananarivoAnalamanga, Madagascar
    851.8×
  53. 53Şabāḩ as SālimMubārak al Kabīr, Kuwait
    851.8×
  54. 54RedmondOregon, United States
    841.8×
  55. 55YamanashiYamanashi, Japan
    841.8×
  56. 56KasaokaOkayama, Japan
    831.8×
  57. 57TsushimaNagasaki, Japan
    831.8×
  58. 58ChennaiTamil Nadu, India
    831.7×
  59. 59FairbanksAlaska, United States
    821.7×
  60. 60La SerenaCoquimbo Region, Chile
    821.7×
  61. 61Ang Mo Kio New TownSingapore
    821.7×
  62. 62IkiNagasaki, Japan
    811.7×
  63. 63Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    811.7×
  64. 64HoustonTexas, United States
    801.6×
  65. 64PeterboroughOntario, Canada
    801.6×
  66. 66Ciudad NezahualcoyotlMéxico, Mexico
    791.6×
  67. 67Maebaru-chūōFukuoka, Japan
    791.6×
  68. 67La UniónLos Ríos Region, Chile
    791.6×
  69. 67Corpus ChristiTexas, United States
    791.6×
  70. 67San Salvador TizatlalliMéxico, Mexico
    791.6×
  71. 71Naucalpan de JuárezMéxico, Mexico
    791.6×
  72. 72Ulu BedokSingapore
    791.6×
  73. 73OakvilleOntario, Canada
    781.6×
  74. 74AustinTexas, United States
    781.6×
  75. 75DelhiDelhi, India
    771.6×
  76. 75SpringdaleArkansas, United States
    771.6×
  77. 77Wan ChaiWan Chai, Hong Kong
    771.5×
  78. 77Nara-shiNara, Japan
    771.5×
  79. 77KurumeFukuoka, Japan
    771.5×
  80. 80TakasakiGunma, Japan
    761.5×
  81. 80WakasugiFukuoka, Japan
    761.5×
  82. 82TorontoOntario, Canada
    761.5×
  83. 83JasperIndiana, United States
    761.5×
  84. 84LouisvilleKentucky, United States
    761.5×
  85. 85Live OakTexas, United States
    761.5×
  86. 86NiihamaEhime, Japan
    751.5×
  87. 86Missouri CityTexas, United States
    751.5×
  88. 88Abujalow-cost sensorsFCT, Nigeria
    751.5×
  89. 88Mission BendTexas, United States
    751.5×
  90. 90YaitaTochigi, Japan
    751.5×
  91. 91AricaArica y Parinacota Region, Chile
    751.5×
  92. 92SayamaOsaka, Japan
    751.5×
  93. 93SarajevoFederation of B&H, Bosnia and Herzegovina
    741.4×
  94. 94Puerto VarasLos Lagos Region, Chile
    741.4×
  95. 94GalvestonTexas, United States
    741.4×
  96. 94MiltonOntario, Canada
    741.4×
  97. 97BaytownTexas, United States
    741.4×
  98. 98JeffersontownKentucky, United States
    741.4×
  99. 99LimaLima Province, Peru
    741.4×
  100. 100KofuYamanashi, Japan
    731.4×
  101. 101AntofagastaAntofagasta, Chile
    731.4×
  102. 101DallasTexas, United States
    731.4×
  103. 103KyotoKyoto, Japan
    731.4×
  104. 103BamakoBamako, Mali
    731.4×
  105. 103CopiapóAtacama, Chile
    731.4×
  106. 103Eagle PassTexas, United States
    731.4×
  107. 103ItoshimaFukuoka, Japan
    731.4×
  108. 108Shin’ichiHiroshima, Japan
    731.4×
  109. 108Villa Poeta José Gálvez BarrenecheaLima region, Peru
    731.4×
  110. 110IkomaNara, Japan
    721.4×
  111. 110FukuokaFukuoka, Japan
    721.4×
  112. 110EvansvilleIndiana, United States
    721.4×
  113. 110San AntonioTexas, United States
    721.4×
  114. 114PasadenaTexas, United States
    721.4×
  115. 115Puerto MonttLos Lagos Region, Chile
    721.4×
  116. 115JeffersonvilleIndiana, United States
    721.4×
  117. 115Ponca CityOklahoma, United States
    721.4×
  118. 115BeltonTexas, United States
    721.4×
  119. 119GuangzhouGuangdong, China
    721.4×
  120. 119IyoEhime, Japan
    721.4×
  121. 119SaijōEhime, Japan
    721.4×
  122. 122MooreOklahoma, United States
    721.3×
  123. 122TexarkanaTexas, United States
    721.3×
  124. 122GuelphOntario, Canada
    721.3×
  125. 125MiharaHiroshima, Japan
    711.3×
  126. 125KogaFukuoka, Japan
    711.3×
  127. 125TulsaOklahoma, United States
    711.3×
  128. 128BarrieOntario, Canada
    711.3×
  129. 128BramptonOntario, Canada
    711.3×
  130. 130UozuToyama, Japan
    711.3×
  131. 130Oklahoma CityOklahoma, United States
    711.3×
  132. 130SherbrookeQuebec, Canada
    711.3×
  133. 133ConroeTexas, United States
    711.3×
  134. 134OwensboroKentucky, United States
    711.3×
  135. 134La PorteTexas, United States
    711.3×
  136. 134ShikokuchūōEhime, Japan
    711.3×
  137. 137Kanzakimachi-kanzakiSaga, Japan
    711.3×
  138. 137Valley StationKentucky, United States
    711.3×
  139. 137ShreveportLouisiana, United States
    711.3×
  140. 137BayonneNew Jersey, United States
    711.3×
  141. 141SalorTashkent Region, Uzbekistan
    701.3×
  142. 141Queenstown Estatelow-cost sensorsSingapore
    701.3×
  143. 143HernandoMississippi, United States
    701.3×
  144. 144Tottori-shiTottori, Japan
    701.3×
  145. 144McAlesterOklahoma, United States
    701.3×
  146. 144East RidgeTennessee, United States
    701.3×
  147. 147YoukaichiShiga, Japan
    701.3×
  148. 147Kashihara-shiNara, Japan
    701.3×
  149. 147IizukaFukuoka, Japan
    701.3×
  150. 147HigashiosakaOsaka, Japan
    701.3×
  151. 147Tepeji del Río de OcampoHidalgo, Mexico
    701.3×
  152. 147BirminghamAlabama, United States
    701.3×
  153. 147WaterdownOntario, Canada
    701.3×
  154. 154NamerikawaToyama, Japan
    701.3×
  155. 154ImabariEhime, Japan
    701.3×
  156. 154Ciudad ApodacaNuevo León, Mexico
    701.3×
  157. 154Kansas CityKansas, United States
    701.3×
  158. 158Kuala LumpurKuala Lumpur, Malaysia
    691.3×
  159. 158ŌtsuShiga, Japan
    691.3×
  160. 158TocopillaAntofagasta, Chile
    691.3×
  161. 158OlatheKansas, United States
    691.3×
  162. 158Saint MatthewsKentucky, United States
    691.3×
  163. 158BartlettTennessee, United States
    691.3×
  164. 158BrantfordOntario, Canada
    691.3×
  165. 158KitchenerOntario, Canada
    691.3×
  166. 158AsakuchiOkayama, Japan
    691.3×
  167. 167HikoneShiga, Japan
    691.3×
  168. 167FukuyamaHiroshima, Japan
    691.3×
  169. 167KasugaFukuoka, Japan
    691.3×
  170. 167Kawachi-NaganoOsaka, Japan
    691.3×
  171. 171NakanojōGunma, Japan
    691.3×
  172. 171KingstonOntario, Canada
    691.3×
  173. 173Tanushimarumachi-toyokiFukuoka, Japan
    691.2×
  174. 173AnkenyIowa, United States
    691.2×
  175. 173FontanaCalifornia, United States
    691.2×
  176. 176MiyazuKyoto, Japan
    691.2×
  177. 176Saint JosephMissouri, United States
    691.2×
  178. 176AdaOklahoma, United States
    691.2×
  179. 176LawtonOklahoma, United States
    691.2×
  180. 176College StationTexas, United States
    691.2×
  181. 176PeoriaIllinois, United States
    691.2×
  182. 176RochesterNew York, United States
    691.2×
  183. 183Mong KokYau Tsim Mong District, Hong Kong
    691.2×
  184. 183YawataKyoto, Japan
    691.2×
  185. 183KaratsuSaga, Japan
    691.2×
  186. 183East Saint LouisIllinois, United States
    691.2×
  187. 183Los AngelesCalifornia, United States
    691.2×
  188. 188NagahamaShiga, Japan
    681.2×
  189. 188Kan’onjichōKagawa, Japan
    681.2×
  190. 188Imarichō-kōSaga, Japan
    681.2×
  191. 188TakuSaga, Japan
    681.2×
  192. 192ZentsujichóKagawa, Japan
    681.2×
  193. 192OnomichiHiroshima, Japan
    681.2×
  194. 192ChichibuSaitama, Japan
    681.2×
  195. 192AnanTokushima, Japan
    681.2×
  196. 192SpringfieldIllinois, United States
    681.2×
  197. 192JacksonTennessee, United States
    681.2×
  198. 192CorsicanaTexas, United States
    681.2×
  199. 192OdessaTexas, United States
    681.2×
  200. 192MississaugaOntario, Canada
    681.2×

Top 200 of 1,774 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, July 28, 2023, smogrank.com/history/2023-07-28 (accessed 2 Oct 2026).

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