SmogRank / Rankings

All 3,290 cities by unhealthy days, last 30 days

Every city with enough measurements in this window, worst first.

CPCB in India: no readings since 12 Oct (488 monitors). EEA in Spain: no readings since 13 Oct (310 monitors). Their cities show older figures or are missing from this board, not clean.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Cities with the same share are ordered by more unhealthy days, then by the higher average.

  1. =2068Oak GroveKentucky, United States 0%0 of 30
  2. =2068University CityMissouri, United States 0%0 of 30
  3. =2068PascagoulaMississippi, United States 0%0 of 24
  4. =2068ElginIllinois, United States 0%0 of 30
  5. =2068GaryIndiana, United States 0%0 of 30
  6. =2068DetroitMichigan, United States 0%0 of 30
  7. =2068PalmyraNew Jersey, United States 0%0 of 30
  8. =2068MaumeeOhio, United States 0%0 of 30
  9. =2068OaklandCalifornia, United States 0%0 of 30
  10. =2068Rancho MurietaCalifornia, United States 0%0 of 30
  11. =2068GlendiveMontana, United States 0%0 of 29
  12. =2068SeattleWashington, United States 0%0 of 30
  13. =2068EstevanSaskatchewan, Canada 0%0 of 29
  14. =2068SayamaOsaka, Japan 0%0 of 30
  15. =2068FuchūTokyo, Japan 0%0 of 30
  16. =2116RēzekneRēzekne, Latvia 0%0 of 29
  17. =2116TakinomiyaKagawa, Japan 0%0 of 28
  18. =2116ShizuokaShizuoka, Japan 0%0 of 30
  19. =2116KomatsuIshikawa, Japan 0%0 of 22
  20. =2116IseharaKanagawa, Japan 0%0 of 30
  21. =2116IkarugaHyōgo, Japan 0%0 of 30
  22. =2116KesennumaMiyagi, Japan 0%0 of 30
  23. =2116HanamakiIwate, Japan 0%0 of 28
  24. =2116RichmondNew South Wales, Australia 0%0 of 28
  25. =2116CampbelltownNew South Wales, Australia 0%0 of 28
  26. =2116BathurstNew South Wales, Australia 0%0 of 27
  27. =2116Kingston upon HullEngland, United Kingdom 0%0 of 30
  28. =2116GraysEngland, United Kingdom 0%0 of 30
  29. =2116BradfordEngland, United Kingdom 0%0 of 30
  30. =2116BlackpoolEngland, United Kingdom 0%0 of 30
  31. =2116NoordwijkerhoutSouth Holland, The Netherlands 0%0 of 30
  32. =2116GingelomFlanders, Belgium 0%0 of 30
  33. =2116WetzlarHesse, Germany 0%0 of 29
  34. =2116Wernigerodelast full day 10 OctSaxony-Anhalt, Germany 0%0 of 27
  35. =2116OytenLower Saxony, Germany 0%0 of 30
  36. =2116Marburg an der LahnHesse, Germany 0%0 of 29
  37. =2116Lauenburglast full day 10 OctSchleswig-Holstein, Germany 0%0 of 26
  38. =2116Eisenachlast full day 10 OctThuringia, Germany 0%0 of 27
  39. =2116ToulouseOccitanie, France 0%0 of 30
  40. =2116BurgosCastille and León, Spain 0%0 of 26
  41. =2116Aranda de DueroCastille and León, Spain 0%0 of 26
  42. =2116Guanajuatolast full day 11 OctGuanajuato, Mexico 0%0 of 24
  43. =2116Valricolast full day 11 OctFlorida, United States 0%0 of 28
  44. =2116Warringtonlast full day 6 OctFlorida, United States 0%0 of 23
  45. =2116BristolVirginia, United States 0%0 of 29
  46. =2116BloomingtonIllinois, United States 0%0 of 30
  47. =2116WarrenvilleIllinois, United States 0%0 of 30
  48. =2116HammondIndiana, United States 0%0 of 30
  49. =2116Michigan CityIndiana, United States 0%0 of 30
  50. =2116El RioCalifornia, United States 0%0 of 30
  51. =2116SeasideCalifornia, United States 0%0 of 24
  52. =2116Baker CityOregon, United States 0%0 of 30
  53. =2116VancouverBritish Columbia, Canada 0%0 of 30
  54. =2116Dallgow-DöberitzBrandenburg, Germany 0%0 of 30
  55. =2116Hitachi-NakaIbaraki, Japan 0%0 of 30
  56. =2116EbinaKanagawa, Japan 0%0 of 30
  57. =2116AkishimaTokyo, Japan 0%0 of 27
  58. =2116YachiyoChiba, Japan 0%0 of 30
  59. =2116HigashimatsushimaMiyagi, Japan 0%0 of 30
  60. =2116MotonaChiba, Japan 0%0 of 30
  61. =2161AtsugiKanagawa, Japan 0%0 of 30
  62. =2161ToyookaHyōgo, Japan 0%0 of 30
  63. =2161TateyamaChiba, Japan 0%0 of 27
  64. =2161SuwaNagano, Japan 0%0 of 30
  65. =2161MachidaTokyo, Japan 0%0 of 30
  66. =2161KanumaTochigi, Japan 0%0 of 30
  67. =2161KaminokawaTochigi, Japan 0%0 of 30
  68. =2161Hamadalast full day 11 OctShimane, Japan 0%0 of 28
  69. =2161TorideIbaraki, Japan 0%0 of 30
  70. =2161Tagajō-shiMiyagi, Japan 0%0 of 30
  71. =2161MookaTochigi, Japan 0%0 of 30
  72. =2161MitoIbaraki, Japan 0%0 of 30
  73. =2161KasamaIbaraki, Japan 0%0 of 29
  74. =2161Port MacquarieNew South Wales, Australia 0%0 of 26
  75. =2161OrangeNew South Wales, Australia 0%0 of 29
  76. =2161SantanaMadeira, Portugal 0%0 of 30
  77. =2161Caravacalast full day 11 OctMurcia, Spain 0%0 of 28
  78. =2161WiganEngland, United Kingdom 0%0 of 30
  79. =2161GothenburgVästra Götaland, Sweden 0%0 of 26
  80. =2161HeerlenLimburg, The Netherlands 0%0 of 30
  81. =2161FreistadtUpper Austria, Austria 0%0 of 29
  82. =2161AarschotFlanders, Belgium 0%0 of 30
  83. =2161WittenbergeBrandenburg, Germany 0%0 of 30
  84. =2161Lüchowlast full day 10 OctLower Saxony, Germany 0%0 of 27
  85. =2161Herrsching am AmmerseeBavaria, Germany 0%0 of 30
  86. =2161Hattingenlast full day 10 OctNorth Rhine-Westphalia, Germany 0%0 of 27
  87. =2161Esch-sur-AlzetteEsch-sur-Alzette, Luxembourg 0%0 of 30
  88. =2161WexfordLeinster, Ireland 0%0 of 30
  89. =2161LetterkennyUlster, Ireland 0%0 of 30
  90. =2161RennesBrittany, France 0%0 of 30
  91. =2161PoitiersNew Aquitaine, France 0%0 of 30
  92. =2161FilderstadtBaden-Wurttemberg, Germany 0%0 of 30
  93. =2161San Miguel de Allendelast full day 11 OctGuanajuato, Mexico 0%0 of 25
  94. =2161FairhopeAlabama, United States 0%0 of 24
  95. =2161BrunswickGeorgia, United States 0%0 of 30
  96. =2161BloomingtonIndiana, United States 0%0 of 30
  97. =2161LawrenceKansas, United States 0%0 of 30
  98. =2161TopekaKansas, United States 0%0 of 30
  99. =2161NicholasvilleKentucky, United States 0%0 of 30
  100. =2161LoudonTennessee, United States 0%0 of 27

What stands behind each figure: Checked at 2+ sites One reference monitor Low-cost sensors About these marks

Low-cost sensors: consumer units, counted only in cities with no government-grade monitor; they read close to reference monitors on the whole, but 15 to 25% high in humid air. How we use them.

Good0–50
Moderate51–100
Unhealthy for 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, Turkey and Iran, which publish only on their own websites. We are building the reader for China's network. The networks of Turkey and Iran don't answer requests from outside their countries, so we can't read them. Most cities there are missing from this board, not clean. Why.

Use this board

SmogRank, all cities ranked by unhealthy days (PM2.5), last 30 days to 14 Oct 2026, 07:00 UTC: each city's share of its measured days with a daily mean over 35.4 µg/m³, cities measured on 21 or more of the 30 days. Monitor data from national networks via OpenAQ and the publishers listed at smogrank.com/sources. smogrank.com/rankings?w=30d&by=days. Ranked on low-cost sensors, with no reference monitor in the city: #1 Peshawar, #2 Multan, #5 Kasur, #7 Gujranwala, #8 Lahore, #9 Faisalabad and #10 Jammu. Some values from Sensor.Community, ODbL. Some readings from Vietnam's government monitors; Department of Environment, Nepal; Aurassure; RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver); Umhverfisstofnun (Environment Agency of Iceland), no reuse terms published.

Download top 10 by average (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.

Updated 2026-10-14 07:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Vietnam's government monitors; Department of Environment, Nepal; Aurassure; RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver); Umhverfisstofnun (Environment Agency of Iceland), no reuse terms published (why we use them).