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. =2161ChesapeakeVirginia, United States 0%0 of 30
  2. =2161Fort DodgeIowa, United States 0%0 of 28
  3. =2161NorthbrookIllinois, United States 0%0 of 30
  4. =2161YoungstownOhio, United States 0%0 of 28
  5. =2161WaukeshaWisconsin, United States 0%0 of 30
  6. =2161YumaArizona, United States 0%0 of 29
  7. =2161GuadalupeCalifornia, United States 0%0 of 30
  8. =2161ParadiseCalifornia, United States 0%0 of 30
  9. =2161SunnyvaleCalifornia, United States 0%0 of 23
  10. =2161ReddingCalifornia, United States 0%0 of 29
  11. =2161ParklandWashington, United States 0%0 of 30
  12. =2161MoranbahQueensland, Australia 0%0 of 30
  13. =2161Logan CityQueensland, Australia 0%0 of 30
  14. =2161Sunshine CoastQueensland, Australia 0%0 of 30
  15. =2161TatsunoHyōgo, Japan 0%0 of 30
  16. =2161Unnanlast full day 11 OctShimane, Japan 0%0 of 28
  17. =2217Cernicalast full day 10 OctIlfov, Romania 0%0 of 27
  18. =2217SuwałkiPodlasie, Poland 0%0 of 30
  19. =2217OwaseMie, Japan 0%0 of 30
  20. =2217OdawaraKanagawa, Japan 0%0 of 30
  21. =2217ObuseNagano, Japan 0%0 of 30
  22. =2217NiimiOkayama, Japan 0%0 of 30
  23. =2217MinanoSaitama, Japan 0%0 of 30
  24. =2217MatsutōIshikawa, Japan 0%0 of 30
  25. =2217KakegawaShizuoka, Japan 0%0 of 30
  26. =2217HadanoKanagawa, Japan 0%0 of 30
  27. =2217FujisawaKanagawa, Japan 0%0 of 30
  28. =2217NaritaChiba, Japan 0%0 of 30
  29. =2217KōriyamaFukushima, Japan 0%0 of 30
  30. =2217Coffs HarbourNew South Wales, Australia 0%0 of 30
  31. =2217CorroiosSetúbal, Portugal 0%0 of 30
  32. =2217KollumFriesland, The Netherlands 0%0 of 30
  33. =2217WiesbadenHesse, Germany 0%0 of 29
  34. =2217Soestlast full day 10 OctNorth Rhine-Westphalia, Germany 0%0 of 27
  35. =2217Salzgitterlast full day 10 OctLower Saxony, Germany 0%0 of 27
  36. =2217Hildesheimlast full day 10 OctLower Saxony, Germany 0%0 of 27
  37. =2217FreiburgBaden-Wurttemberg, Germany 0%0 of 30
  38. =2217NantesPays de la Loire, France 0%0 of 30
  39. =2217LunelOccitanie, France 0%0 of 30
  40. =2217HarfleurNormandy, France 0%0 of 30
  41. =2217DreuxCentre-Val de Loire, France 0%0 of 30
  42. =2217CaenNormandy, France 0%0 of 30
  43. =2217AmiensHauts-de-France, France 0%0 of 30
  44. =2217AvellinoCampania, Italy 0%0 of 29
  45. =2217AshlandKentucky, United States 0%0 of 30
  46. =2217ArnoldMissouri, United States 0%0 of 30
  47. =2217DurhamNorth Carolina, United States 0%0 of 30
  48. =2217GreensboroNorth Carolina, United States 0%0 of 26
  49. =2217HickoryNorth Carolina, United States 0%0 of 30
  50. =2217Roanoke RapidsNorth Carolina, United States 0%0 of 30
  51. =2217YorkPennsylvania, United States 0%0 of 26
  52. =2217ColumbiaTennessee, United States 0%0 of 30
  53. =2217SeabrookTexas, United States 0%0 of 30
  54. =2217Cedar RapidsIowa, United States 0%0 of 30
  55. =2217AndersonIndiana, United States 0%0 of 30
  56. =2217South BendIndiana, United States 0%0 of 30
  57. =2217AlpineCalifornia, United States 0%0 of 30
  58. =2217San RafaelCalifornia, United States 0%0 of 25
  59. =2217SocorroTexas, United States 0%0 of 30
  60. =2217West JordanUtah, United States 0%0 of 27
  61. =2217DuncanBritish Columbia, Canada 0%0 of 29
  62. =2217SōsaChiba, Japan 0%0 of 29
  63. =2217ŌsakiMiyagi, Japan 0%0 of 30
  64. =2217MinamiuonumaNiigata, Japan 0%0 of 29
  65. =2217Tannum SandsQueensland, Australia 0%0 of 30
  66. =2217Albion Park RailNew South Wales, Australia 0%0 of 27
  67. =2267SevlievoGabrovo, Bulgaria 0%0 of 29
  68. =2267GrevenáWest Macedonia, Greece 0%0 of 30
  69. =2267ShironeNiigata, Japan 0%0 of 29
  70. =2267ShimodaShizuoka, Japan 0%0 of 30
  71. =2267SaikuboGunma, Japan 0%0 of 30
  72. =2267Ōdachō-ōdalast full day 11 OctShimane, Japan 0%0 of 28
  73. =2267NaganoNagano, Japan 0%0 of 30
  74. =2267MatsumotoNagano, Japan 0%0 of 30
  75. =2267MaizuruKyoto, Japan 0%0 of 30
  76. =2267ŌmihachimanShiga, Japan 0%0 of 30
  77. =2267AtamiShizuoka, Japan 0%0 of 30
  78. =2267YonezawaYamagata, Japan 0%0 of 28
  79. =2267YokoshibaChiba, Japan 0%0 of 27
  80. =2267HachinoheAomori, Japan 0%0 of 30
  81. =2267GladstoneQueensland, Australia 0%0 of 30
  82. =2267CampillosAndalusia, Spain 0%0 of 29
  83. =2267RotherhamEngland, United Kingdom 0%0 of 30
  84. =2267Wilhelmshavenlast full day 10 OctLower Saxony, Germany 0%0 of 27
  85. =2267Villingen-SchwenningenBaden-Wurttemberg, Germany 0%0 of 30
  86. =2267Suhllast full day 10 OctThuringia, Germany 0%0 of 27
  87. =2267Elsenfeldlast full day 10 OctBavaria, Germany 0%0 of 27
  88. =2267BremerhavenBremen, Germany 0%0 of 30
  89. =2267Barthlast full day 10 OctMecklenburg-Vorpommern, Germany 0%0 of 27
  90. =2267WaterfordMunster, Ireland 0%0 of 30
  91. =2267EnnisMunster, Ireland 0%0 of 30
  92. =2267MarmandeNew Aquitaine, France 0%0 of 27
  93. =2267JonageAuvergne-Rhône-Alpes, France 0%0 of 30
  94. =2267HaguenauGrand Est, France 0%0 of 30
  95. =2267ÉvreuxNormandy, France 0%0 of 30
  96. =2267Biograd na MoruZadar, Croatia 0%0 of 30
  97. =2267Fort SmithArkansas, United States 0%0 of 29
  98. =2267Fort LauderdaleFlorida, United States 0%0 of 30
  99. =2267MiamiFlorida, United States 0%0 of 29
  100. =2267HazardKentucky, 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).