SmogRank / Rankings

All 3,198 cities by unhealthy days, this year

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. =2798CampbelltownNew South Wales, Australia 0%0 of 277
  2. =2798CampillosAndalusia, Spain 0%0 of 276
  3. =2798SunderlandEngland, United Kingdom 0%0 of 276
  4. =2798ReadingEngland, United Kingdom 0%0 of 276
  5. =2798LoughboroughEngland, United Kingdom 0%0 of 276
  6. =2798LeicesterEngland, United Kingdom 0%0 of 276
  7. =2798Zell am SeeSalzburg, Austria 0%0 of 265
  8. =2798DublinLeinster, Ireland 0%0 of 285
  9. =2798CorkMunster, Ireland 0%0 of 285
  10. =2798Saint-Étienne-de-MontlucPays de la Loire, France 0%0 of 282
  11. =2798AngletNew Aquitaine, France 0%0 of 259
  12. =2798DrammenBuskerud, Norway 0%0 of 232
  13. =2798FairfieldAlabama, United States no daily values yet0%0 of 232
  14. =2798Delray BeachFlorida, United States 0%0 of 280
  15. =2798LeawoodKansas, United States 0%0 of 269
  16. =2798CookevilleTennessee, United States 0%0 of 269
  17. =2798WatertownSouth Dakota, United States 0%0 of 256
  18. =2798BanningCalifornia, United States 0%0 of 286
  19. =2798GaltCalifornia, United States 0%0 of 273
  20. =2798LincolnCalifornia, United States 0%0 of 271
  21. =2798Santa CruzCalifornia, United States 0%0 of 268
  22. =2798Rapid CitySouth Dakota, United States 0%0 of 251
  23. =2798Kailua-Konalast full day 30 SeptHawaii, United States 0%0 of 265
  24. =2798QuébecQuebec, Canada 0%0 of 283
  25. =2825HelsinkiUusimaa, Finland 0%0 of 286
  26. =2825SakuNagano, Japan 0%0 of 277
  27. =2825NonoichiIshikawa, Japan 0%0 of 278
  28. =2825ObihiroHokkaido, Japan 0%0 of 272
  29. =2825MackayQueensland, Australia 0%0 of 286
  30. =2825Los BarriosAndalusia, Spain 0%0 of 235
  31. =2825PrestonEngland, United Kingdom 0%0 of 211
  32. =2825ChesterfieldEngland, United Kingdom 0%0 of 271
  33. =2825ChepstowWales, United Kingdom 0%0 of 250
  34. =2825BurwellEngland, United Kingdom 0%0 of 211
  35. =2825BirminghamEngland, United Kingdom 0%0 of 286
  36. =2825FreistadtUpper Austria, Austria 0%0 of 274
  37. =2825GalwayConnacht, Ireland 0%0 of 280
  38. =2825VichyAuvergne-Rhône-Alpes, France 0%0 of 278
  39. =2825NiortNew Aquitaine, France 0%0 of 284
  40. =2825BarBar, Montenegro 0%0 of 286
  41. =2825OrlandoFlorida, United States 0%0 of 282
  42. =2825HazardKentucky, United States 0%0 of 283
  43. =2825FillmoreCalifornia, United States 0%0 of 281
  44. =2825HuronCalifornia, United States 0%0 of 279
  45. =2825BountifulUtah, United States 0%0 of 285
  46. =2825TakizawaIwate, Japan 0%0 of 275
  47. =2847VantaaUusimaa, Finland 0%0 of 286
  48. =2847OkayaNagano, Japan 0%0 of 282
  49. =2847ŌgakiGifu, Japan 0%0 of 282
  50. =2847TōganeChiba, Japan 0%0 of 272
  51. =2847MelbourneVictoria, Australia 0%0 of 252
  52. =2847Ayrlast full day 5 OctQueensland, Australia 0%0 of 278
  53. =2847BuñolValencia, Spain 0%0 of 234
  54. =2847SligoConnacht, Ireland 0%0 of 285
  55. =2847BallinasloeConnacht, Ireland 0%0 of 222
  56. =2847ColmarGrand Est, France 0%0 of 225
  57. =2847Clermont-FerrandAuvergne-Rhône-Alpes, France 0%0 of 286
  58. =2847OviedoAsturias, Spain 0%0 of 286
  59. =2847CarralGalicia, Spain 0%0 of 241
  60. =2847KearneyMissouri, United States 0%0 of 273
  61. =2847HarrimanTennessee, United States 0%0 of 277
  62. =2847KingsportTennessee, United States 0%0 of 276
  63. =2847BeatriceNebraska, United States 0%0 of 230
  64. =2847TucsonArizona, United States 0%0 of 284
  65. =2847ColusaCalifornia, United States 0%0 of 272
  66. =2847TemeculaCalifornia, United States 0%0 of 267
  67. =2847GranbyQuebec, Canada 0%0 of 282
  68. =2847Four CornersFlorida, United States 0%0 of 277
  69. =2847TomeMiyagi, Japan 0%0 of 280
  70. =2870KogaIbaraki, Japan 0%0 of 275
  71. =2870KujiIwate, Japan 0%0 of 267
  72. =2870GunnedahNew South Wales, Australia 0%0 of 272
  73. =2870DunholmeEngland, United Kingdom 0%0 of 273
  74. =2870CreweEngland, United Kingdom 0%0 of 274
  75. =2870CoventryEngland, United Kingdom 0%0 of 276
  76. =2870CannockEngland, United Kingdom 0%0 of 214
  77. =2870LeixlipLeinster, Ireland 0%0 of 285
  78. =2870DroghedaLeinster, Ireland 0%0 of 269
  79. =2870TroyesGrand Est, France 0%0 of 244
  80. =2870Bellegarde-sur-ValserineAuvergne-Rhône-Alpes, France 0%0 of 279
  81. =2870Fort MyersFlorida, United States 0%0 of 252
  82. =2870Show Lowlast full day 11 OctArizona, United States 0%0 of 270
  83. =2870TempeArizona, United States 0%0 of 285
  84. =2870OrcuttCalifornia, United States 0%0 of 284
  85. =2870AmarilloTexas, United States 0%0 of 203
  86. =2870LongmontColorado, United States 0%0 of 279
  87. =2870Spanish ForkUtah, United States 0%0 of 280
  88. =2870DrummondvilleQuebec, Canada 0%0 of 283
  89. =2870KuriharaMiyagi, Japan 0%0 of 282
  90. =2870MizunashiFukushima, Japan 0%0 of 244
  91. =2870Rivière-des-Prairies–Pointe-aux-TremblesQuebec, Canada 0%0 of 286
  92. =2892OrangeNew South Wales, Australia 0%0 of 254
  93. =2892Grao de MurviedroValencia, Spain 0%0 of 228
  94. =2892WorcesterEngland, United Kingdom 0%0 of 276
  95. =2892Royal Leamington SpaEngland, United Kingdom 0%0 of 272
  96. =2892AylesburyEngland, United Kingdom 0%0 of 276
  97. =2892Neuhaus am Rennweglast full day 10 OctThuringia, Germany 0%0 of 282
  98. =2892Carlowlast full day 9 OctLeinster, Ireland 0%0 of 225
  99. =2892BlanchardstownLeinster, Ireland 0%0 of 208
  100. =2892McDonoughGeorgia, United States 0%0 of 282

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

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), this year 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 70% or more of the days since 1 January (at least 14). Monitor data from national networks via OpenAQ and the publishers listed at smogrank.com/sources. smogrank.com/rankings?w=year&by=days. Ranked on low-cost sensors, with no reference monitor in the city: #4 Kampala and #8 Faisalabad. Some values from Sensor.Community, ODbL. Some readings from Department of Environment, Nepal; Vietnam's government monitors; Aurassure; RMCAB (Secretaría Distrital de Ambiente, Bogotá); 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: Department of Environment, Nepal; Vietnam's government monitors; Aurassure; RMCAB (Secretaría Distrital de Ambiente, Bogotá); Umhverfisstofnun (Environment Agency of Iceland), no reuse terms published (why we use them).