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. =1769DecaturIllinois, United States 0%0 of 30
  2. =1769AthensTennessee, United States 0%0 of 30
  3. =1769WaterlooIowa, United States 0%0 of 30
  4. =1769BeecherMichigan, United States 0%0 of 30
  5. =1769WestervilleOhio, United States 0%0 of 30
  6. =1769Show Lowlast full day 11 OctArizona, United States 0%0 of 26
  7. =1769CarpinteriaCalifornia, United States 0%0 of 28
  8. =1769RentonWashington, United States 0%0 of 30
  9. =1769JōsōIbaraki, Japan 0%0 of 28
  10. =1769BuzenFukuoka, Japan 0%0 of 30
  11. =1769JōyōKyoto, Japan 0%0 of 30
  12. =1769Jordan SpringsNew South Wales, Australia 0%0 of 29
  13. =1813YoriiSaitama, Japan 0%0 of 30
  14. =1813YokohamaKanagawa, Japan 0%0 of 30
  15. =1813TakarazukaHyōgo, Japan 0%0 of 30
  16. =1813SabaeFukui, Japan 0%0 of 30
  17. =1813OnoHyōgo, Japan 0%0 of 30
  18. =1813NakanojōGunma, Japan 0%0 of 30
  19. =1813KawagoeSaitama, Japan 0%0 of 30
  20. =1813KashiwaChiba, Japan 0%0 of 30
  21. =1813FurukawamenNagasaki, Japan 0%0 of 30
  22. =1813IchiharaChiba, Japan 0%0 of 30
  23. =1813SydneyNew South Wales, Australia 0%0 of 30
  24. =1813LeedsEngland, United Kingdom 0%0 of 30
  25. =1813ZürichZurich, Switzerland 0%0 of 29
  26. =1813LuganoTicino, Switzerland 0%0 of 29
  27. =1813Velsen-ZuidNorth Holland, The Netherlands 0%0 of 28
  28. =1813MaassluisSouth Holland, The Netherlands 0%0 of 29
  29. =1813StuttgartBaden-Wurttemberg, Germany 0%0 of 30
  30. =1813Schwertelast full day 10 OctNorth Rhine-Westphalia, Germany 0%0 of 27
  31. =1813Merseburglast full day 10 OctSaxony-Anhalt, Germany 0%0 of 26
  32. =1813Leverkusenlast full day 10 OctNorth Rhine-Westphalia, Germany 0%0 of 27
  33. =1813LampertheimHesse, Germany 0%0 of 30
  34. =1813Erfurtlast full day 10 OctThuringia, Germany 0%0 of 27
  35. =1813FréjusProvence-Alpes-Côte d'Azur, France 0%0 of 30
  36. =1813Durbanvillelast full day 8 OctWestern Cape, South Africa 0%0 of 25
  37. =1813Presidente PrudenteSão Paulo, Brazil 0%0 of 30
  38. =1813Le LamentinMartinique, Martinique 0%0 of 28
  39. =1813PaducahKentucky, United States 0%0 of 29
  40. =1813Ponte Vedra BeachFlorida, United States 0%0 of 30
  41. =1813ElizabethtownKentucky, United States 0%0 of 30
  42. =1813MiddlesboroKentucky, United States 0%0 of 30
  43. =1813OwensboroKentucky, United States 0%0 of 30
  44. =1813Winston-SalemNorth Carolina, United States 0%0 of 30
  45. =1813DaytonOhio, United States 0%0 of 30
  46. =1813DentsvilleSouth Carolina, United States 0%0 of 30
  47. =1813KalamazooMichigan, United States 0%0 of 30
  48. =1813Buffalolast full day 11 OctNew York, United States 0%0 of 28
  49. =1813West MifflinPennsylvania, United States 0%0 of 30
  50. =1813BanningCalifornia, United States 0%0 of 30
  51. =1813Gilroylast full day 11 OctCalifornia, United States 0%0 of 26
  52. =1813Palo AltoCalifornia, United States 0%0 of 29
  53. =1813SalinasCalifornia, United States 0%0 of 30
  54. =1813Santa CruzCalifornia, United States 0%0 of 30
  55. =1813Simi ValleyCalifornia, United States 0%0 of 30
  56. =1813UkiahCalifornia, United States 0%0 of 29
  57. =1813AbbotsfordBritish Columbia, Canada 0%0 of 30
  58. =1813La Crescenta-MontroseCalifornia, United States 0%0 of 28
  59. =1813KodairaTokyo, Japan 0%0 of 30
  60. =1813KamagayaChiba, Japan 0%0 of 30
  61. =1813LemwerderLower Saxony, Germany 0%0 of 30
  62. =1862RostusaMavrovo and Rostuša, North Macedonia 0%0 of 30
  63. =1862KofuYamanashi, Japan 0%0 of 30
  64. =1862Kazolast full day 6 OctSaitama, Japan 0%0 of 23
  65. =1862Izumolast full day 11 OctShimane, Japan 0%0 of 28
  66. =1862IidaNagano, Japan 0%0 of 30
  67. =1862IbiGifu, Japan 0%0 of 30
  68. =1862HirakataOsaka, Japan 0%0 of 30
  69. =1862AsahikawaHokkaido, Japan 0%0 of 30
  70. =1862MaryboroughQueensland, Australia 0%0 of 30
  71. =1862CártamaAndalusia, Spain 0%0 of 25
  72. =1862NorthamptonEngland, United Kingdom 0%0 of 25
  73. =1862CardiffWales, United Kingdom 0%0 of 30
  74. =1862MusselkanaalGroningen, The Netherlands 0%0 of 21
  75. =1862LienzTyrol, Austria 0%0 of 30
  76. =1862Wolfsburglast full day 10 OctLower Saxony, Germany 0%0 of 27
  77. =1862RitterhudeLower Saxony, Germany 0%0 of 30
  78. =1862Neuruppinlast full day 11 OctBrandenburg, Germany 0%0 of 28
  79. =1862Mainzlast full day 10 OctRheinland-Pfalz, Germany 0%0 of 27
  80. =1862Kleinmachnowlast full day 10 OctBrandenburg, Germany 0%0 of 25
  81. =1862KarlsruheBaden-Wurttemberg, Germany 0%0 of 30
  82. =1862Fürstenberglast full day 10 OctBrandenburg, Germany 0%0 of 26
  83. =1862Bad Frankenhausenlast full day 10 OctThuringia, Germany 0%0 of 27
  84. =1862NîmesOccitanie, France 0%0 of 30
  85. =1862LunévilleGrand Est, France 0%0 of 30
  86. =1862BrestBrittany, France 0%0 of 30
  87. =1862BeauvaisHauts-de-France, France 0%0 of 28
  88. =1862KomárnoNitra Region, Slovakia 0%0 of 26
  89. =1862Le RobertMartinique, Martinique 0%0 of 24
  90. =1862Fort-de-FranceMartinique, Martinique 0%0 of 28
  91. =1862AlbanyGeorgia, United States 0%0 of 29
  92. =1862JasperIndiana, United States 0%0 of 30
  93. =1862ChalmetteLouisiana, United States 0%0 of 30
  94. =1862Saint JosephMissouri, United States 0%0 of 30
  95. =1862AshevilleNorth Carolina, United States 0%0 of 29
  96. =1862MaryvilleTennessee, United States 0%0 of 30
  97. =1862DoltonIllinois, United States 0%0 of 28
  98. =1862ClevelandOhio, United States 0%0 of 30
  99. =1862LancasterPennsylvania, United States 0%0 of 30
  100. =1862TemeculaCalifornia, United States 0%0 of 30

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).