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. =1958CantonOhio, United States 0%0 of 30
  2. =1958BerkeleyCalifornia, United States 0%0 of 25
  3. =1958Morro Baylast full day 6 OctCalifornia, United States 0%0 of 23
  4. =1958South San FranciscoCalifornia, United States 0%0 of 26
  5. =1958TigardOregon, United States 0%0 of 29
  6. =1958InzaiChiba, Japan 0%0 of 30
  7. =1958HigashimurayamaTokyo, Japan 0%0 of 30
  8. =1958NoboritoKanagawa, Japan 0%0 of 30
  9. =1958YamanashiYamanashi, Japan 0%0 of 30
  10. =2010OlsztynWarmia-Masuria, Poland 0%0 of 30
  11. =2010RiversdaleWestern Cape, South Africa 0%0 of 21
  12. =2010T’aebaekGangwon-do, South Korea 0%0 of 30
  13. =2010KosongGangwon-do, South Korea 0%0 of 27
  14. =2010YukuhashiFukuoka, Japan 0%0 of 30
  15. =2010YaitaTochigi, Japan 0%0 of 28
  16. =2010UrayasuChiba, Japan 0%0 of 30
  17. =2010TsurugaFukui, Japan 0%0 of 25
  18. =2010ObamaFukui, Japan 0%0 of 30
  19. =2010NagaokaNiigata, Japan 0%0 of 24
  20. =2010KitahamaShiga, Japan 0%0 of 29
  21. =2010KasukabeSaitama, Japan 0%0 of 30
  22. =2010KameokaKyoto, Japan 0%0 of 30
  23. =2010HannōSaitama, Japan 0%0 of 30
  24. =2010HakuiIshikawa, Japan 0%0 of 22
  25. =2010FukuchiyamaKyoto, Japan 0%0 of 30
  26. =2010AyabeKyoto, Japan 0%0 of 30
  27. =2010ShinjōYamagata, Japan 0%0 of 28
  28. =2010ChibaChiba, Japan 0%0 of 30
  29. =2010ArmidaleNew South Wales, Australia 0%0 of 29
  30. =2010ZaventemFlanders, Belgium 0%0 of 30
  31. =2010Neuenburg am RheinBaden-Wurttemberg, Germany 0%0 of 30
  32. =2010Malchowlast full day 10 OctMecklenburg-Vorpommern, Germany 0%0 of 26
  33. =2010GießenHesse, Germany 0%0 of 29
  34. =2010Frankfurt am MainHesse, Germany 0%0 of 29
  35. =2010Eggenstein-LeopoldshafenBaden-Wurttemberg, Germany 0%0 of 30
  36. =2010Bamberglast full day 10 OctBavaria, Germany 0%0 of 27
  37. =2010Salon-de-ProvenceProvence-Alpes-Côte d'Azur, France 0%0 of 28
  38. =2010ForbachGrand Est, France 0%0 of 30
  39. =2010BordeauxNew Aquitaine, France 0%0 of 30
  40. =2010Žďár nad SázavouVysocina, Czechia 0%0 of 30
  41. =2010ChrastavaLiberec Region, Czechia 0%0 of 29
  42. =2010PalenciaCastille and León, Spain 0%0 of 26
  43. =2010Bonita SpringsFlorida, United States 0%0 of 27
  44. =2010SpringfieldIllinois, United States 0%0 of 30
  45. =2010FlatwoodsKentucky, United States 0%0 of 28
  46. =2010JeffersontownKentucky, United States 0%0 of 29
  47. =2010PrienLouisiana, United States 0%0 of 30
  48. =2010ColumbiaMissouri, United States 0%0 of 30
  49. =2010Kansas CityMissouri, United States 0%0 of 23
  50. =2010PennsaukenNew Jersey, United States 0%0 of 30
  51. =2010GreenvilleSouth Carolina, United States 0%0 of 30
  52. =2010Huntingtonlast full day 10 OctWest Virginia, United States 0%0 of 24
  53. =2010ChampaignIllinois, United States 0%0 of 22
  54. =2010LincolnwoodIllinois, United States 0%0 of 30
  55. =2010Columbia CityIndiana, United States 0%0 of 29
  56. =2010KokomoIndiana, United States 0%0 of 29
  57. =2010WarrenOhio, United States 0%0 of 30
  58. =2010FillmoreCalifornia, United States 0%0 of 30
  59. =2010West Valley CityUtah, United States 0%0 of 28
  60. =2010Drayton ValleyAlberta, Canada 0%0 of 29
  61. =2010KelownaBritish Columbia, Canada 0%0 of 26
  62. =2010InashikiIbaraki, Japan 0%0 of 26
  63. =2010KasugaFukuoka, Japan 0%0 of 30
  64. =2010Minami-SōmaFukushima, Japan 0%0 of 27
  65. =2010IrumaSaitama, Japan 0%0 of 30
  66. =2010Minami-AlpsYamanashi, Japan 0%0 of 30
  67. =2010YamatoKanagawa, Japan 0%0 of 30
  68. =2068Gevgelijalast full day 10 OctGevgelija, North Macedonia 0%0 of 25
  69. =2068GuanshanTaiwan, Taiwan 0%0 of 30
  70. =2068UtsunomiyaTochigi, Japan 0%0 of 30
  71. =2068TsubataIshikawa, Japan 0%0 of 30
  72. =2068TokorozawaSaitama, Japan 0%0 of 30
  73. =2068ShimadaShizuoka, Japan 0%0 of 30
  74. =2068OnoFukui, Japan 0%0 of 30
  75. =2068NumazuShizuoka, Japan 0%0 of 30
  76. =2068NagatoYamaguchi, Japan 0%0 of 30
  77. =2068Mount IsaQueensland, Australia 0%0 of 30
  78. =2068ShiroishiMiyagi, Japan 0%0 of 30
  79. =2068SakamotoMiyagi, Japan 0%0 of 30
  80. =2068MoriokaIwate, Japan 0%0 of 30
  81. =2068TuggeranongAustralian Capital Territory, Australia 0%0 of 29
  82. =2068FunchalMadeira, Portugal 0%0 of 30
  83. =2068SpekeEngland, United Kingdom 0%0 of 30
  84. =2068BournemouthEngland, United Kingdom 0%0 of 30
  85. =2068BrusselsBrussels Capital, Belgium 0%0 of 30
  86. =2068Schwäbisch HallBaden-Wurttemberg, Germany 0%0 of 30
  87. =2068ReutlingenBaden-Wurttemberg, Germany 0%0 of 30
  88. =2068Ratingenlast full day 10 OctNorth Rhine-Westphalia, Germany 0%0 of 27
  89. =2068Lünenlast full day 10 OctNorth Rhine-Westphalia, Germany 0%0 of 27
  90. =2068LubnjowBrandenburg, Germany 0%0 of 30
  91. =2068Limburg an der LahnHesse, Germany 0%0 of 29
  92. =2068Halberstadtlast full day 10 OctSaxony-Anhalt, Germany 0%0 of 27
  93. =2068Burg bei Magdeburglast full day 10 OctSaxony-Anhalt, Germany 0%0 of 25
  94. =2068BallinasloeConnacht, Ireland 0%0 of 30
  95. =2068CoulommiersÎle-de-France, France 0%0 of 30
  96. =2068ArrasHauts-de-France, France 0%0 of 28
  97. =2068Rio de JaneiroRio de Janeiro, Brazil 0%0 of 30
  98. =2068Venice Gardenslast full day 11 OctFlorida, United States 0%0 of 27
  99. =2068GainesvilleGeorgia, United States 0%0 of 30
  100. =2068LeawoodKansas, United States 0%0 of 29

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).