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. =3096HollisterCalifornia, United States 0%0 of 283
  2. =3096Ridgecrestlast full day 10 OctCalifornia, United States 0%0 of 283
  3. =3096PierreSouth Dakota, United States 0%0 of 264
  4. =3096LaceyWashington, United States 0%0 of 281
  5. =3096NanaimoBritish Columbia, Canada 0%0 of 262
  6. =3096WhistlerBritish Columbia, Canada 0%0 of 261
  7. =3107HämeenkyläUusimaa, Finland 0%0 of 286
  8. =3107EmeraldQueensland, Australia 0%0 of 265
  9. =3107Castelló de la PlanaValencia, Spain 0%0 of 254
  10. =3107KüssnachtSchwyz, Switzerland 0%0 of 280
  11. =3107JumetWallonia, Belgium 0%0 of 281
  12. =3107Carson CityNevada, United States 0%0 of 285
  13. =3107PrestonIdaho, United States 0%0 of 277
  14. =3107RoseburgOregon, United States 0%0 of 261
  15. =3107VernalUtah, United States 0%0 of 286
  16. =3107BurienWashington, United States 0%0 of 276
  17. =3107SmithersBritish Columbia, Canada 0%0 of 211
  18. =3107TerraceBritish Columbia, Canada 0%0 of 271
  19. =3119Tallinnlast full day 10 OctHarjumaa, Estonia 0%0 of 271
  20. =3119SantanaMadeira, Portugal 0%0 of 286
  21. =3119ShannonMunster, Ireland 0%0 of 285
  22. =3119MaranaArizona, United States 0%0 of 276
  23. =3119Spring ValleyNevada, United States 0%0 of 286
  24. =3119HurricaneUtah, United States 0%0 of 284
  25. =3119LongviewWashington, United States 0%0 of 286
  26. =3126CairnsQueensland, Australia 0%0 of 286
  27. =3126CorroiosSetúbal, Portugal 0%0 of 285
  28. =3126SaltashEngland, United Kingdom 0%0 of 251
  29. =3129NarrabriNew South Wales, Australia 0%0 of 275
  30. =3129FunchalMadeira, Portugal 0%0 of 251
  31. =3129LaconiaNew Hampshire, United States 0%0 of 284
  32. =3129AberdeenSouth Dakota, United States 0%0 of 275
  33. =3129VermillionSouth Dakota, United States 0%0 of 282
  34. =3129HendersonNevada, United States 0%0 of 286
  35. =3129Coos BayOregon, United States 0%0 of 260
  36. =3129SheltonWashington, United States 0%0 of 284
  37. =3129GilletteWyoming, United States 0%0 of 249
  38. =3129DeltaBritish Columbia, Canada 0%0 of 284
  39. =3129FrederictonNew Brunswick, Canada 0%0 of 281
  40. =3129MonctonNew Brunswick, Canada 0%0 of 286
  41. =3141TamperePirkanmaa, Finland 0%0 of 286
  42. =3141Saint-PaulReunion, Reunion 0%0 of 267
  43. =3141BlackwaterQueensland, Australia 0%0 of 230
  44. =3141EnterpriseNevada, United States 0%0 of 286
  45. =3141HonoluluHawaii, United States 0%0 of 281
  46. =3141West Vancouverlast full day 10 OctBritish Columbia, Canada 0%0 of 282
  47. =3147Kohtla-Järvelast full day 9 OctIda-Virumaa, Estonia 0%0 of 266
  48. =3147OuluNorth Ostrobothnia, Finland 0%0 of 280
  49. =3147Port TownsendWashington, United States 0%0 of 283
  50. =3147MiramichiNew Brunswick, Canada 0%0 of 286
  51. =3151Mount IsaQueensland, Australia 0%0 of 283
  52. =3151CouvinWallonia, Belgium 0%0 of 276
  53. =3151BlairNebraska, United States 0%0 of 246
  54. =3151TaosNew Mexico, United States 0%0 of 272
  55. =3151FlorenceOregon, United States 0%0 of 282
  56. =3151KīheiHawaii, United States 0%0 of 263
  57. =3151PalmerAlaska, United States 0%0 of 272
  58. =3158UmeåVästerbotten, Sweden 0%0 of 203
  59. =3158InvernessScotland, United Kingdom 0%0 of 276
  60. =3158KentvilleNova Scotia, Canada 0%0 of 282
  61. =3158Sydneylast full day 11 OctNova Scotia, Canada 0%0 of 277
  62. =3158Summerlin SouthNevada, United States 0%0 of 284
  63. =3163MesquiteNevada, United States 0%0 of 286
  64. =3163RivertonWyoming, United States 0%0 of 264
  65. =3163KahuluiHawaii, United States 0%0 of 246
  66. =3166Saint-DenisReunion, Reunion 0%0 of 213
  67. =3166AlicanteValencia, Spain 0%0 of 250
  68. =3166Habay-la-VieilleWallonia, Belgium 0%0 of 263
  69. =3166Boulder CityNevada, United States 0%0 of 286
  70. =3166AberdeenWashington, United States 0%0 of 286
  71. =3166West GreenwichRhode Island, United States 0%0 of 266
  72. =3172Vila RealVila Real, Portugal 0%0 of 226
  73. =3172Hilolast full day 11 OctHawaii, United States 0%0 of 272
  74. =3174ÖstersundJämtland, Sweden 0%0 of 284
  75. =3174Hawaiian Paradise ParkHawaii, United States 0%0 of 271
  76. =3174CharlottetownPrince Edward Island, Canada 0%0 of 264
  77. =3177AdelaideSouth Australia, Australia 0%0 of 206
  78. =3177Bodølast full day 7 OctNordland, Norway 0%0 of 215
  79. =3177ReykjavíkCapital Region, Iceland 0%0 of 286
  80. =3177LompocCalifornia, United States 0%0 of 257
  81. =3177Rock SpringsWyoming, United States 0%0 of 266
  82. =3177Campbell RiverBritish Columbia, Canada 0%0 of 277
  83. =3177Port WallaceNova Scotia, Canada 0%0 of 282
  84. 3184North CowichanBritish Columbia, Canada 0%0 of 261
  85. =3185Green ValleyArizona, United States 0%0 of 279
  86. =3185LaramieWyoming, United States 0%0 of 263
  87. =3185RanchettesWyoming, United States 0%0 of 280
  88. =3185RawlinsWyoming, United States 0%0 of 282
  89. 3189CasperWyoming, United States 0%0 of 283
  90. 3190HortaAzores, Portugal 0%0 of 267
  91. =3191Farolast full day 3 OctFaro, Portugal 0%0 of 243
  92. =3191Brookingslast full day 7 OctOregon, United States 0%0 of 279
  93. =3191Mount VernonWashington, United States 0%0 of 267
  94. =3194Angra do HeroísmoAzores, Portugal 0%0 of 273
  95. =3194NewportOregon, United States 0%0 of 278
  96. 3196AnacortesWashington, United States 0%0 of 256
  97. 3197Petite-ÎleReunion, Reunion 0%0 of 206
  98. 3198GarðabærCapital Region, Iceland 0%0 of 281

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).