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. =2591DongesPays de la Loire, France 0%0 of 286
  2. =2591DoleBourgogne-Franche-Comté, France 0%0 of 273
  3. =2591BrestBrittany, France 0%0 of 286
  4. =2591AlbertvilleAuvergne-Rhône-Alpes, France 0%0 of 271
  5. =2591GyöngyösHeves County, Hungary 0%0 of 217
  6. =2591Oak GroveKentucky, United States 0%0 of 276
  7. =2591ChalmetteLouisiana, United States 0%0 of 276
  8. =2591KennerLouisiana, United States 0%0 of 286
  9. =2591ColumbiaTennessee, United States 0%0 of 279
  10. =2591MinamiuonumaNiigata, Japan 0%0 of 269
  11. =2591HigashimurayamaTokyo, Japan 0%0 of 257
  12. =2591ShirakawaFukushima, Japan 0%0 of 265
  13. =2613YokosukaKanagawa, Japan 0%0 of 273
  14. =2613SuwaNagano, Japan 0%0 of 282
  15. =2613ShimodaShizuoka, Japan 0%0 of 270
  16. =2613SaikuboGunma, Japan 0%0 of 269
  17. =2613AsahikawaHokkaido, Japan 0%0 of 279
  18. =2613Storringtonlast full day 11 OctEngland, United Kingdom 0%0 of 244
  19. =2613BrightlingseaEngland, United Kingdom 0%0 of 208
  20. =2613VillefontaineAuvergne-Rhône-Alpes, France 0%0 of 240
  21. =2613Salon-de-ProvenceProvence-Alpes-Côte d'Azur, France 0%0 of 284
  22. =2613L'Isle-d'AbeauAuvergne-Rhône-Alpes, France 0%0 of 284
  23. =2613Bourg-en-BresseAuvergne-Rhône-Alpes, France 0%0 of 285
  24. =2613ZierbenaBasque Country, Spain 0%0 of 279
  25. =2613Sarpsborglast full day 10 OctØstfold, Norway 0%0 of 205
  26. =2613AshevilleNorth Carolina, United States 0%0 of 279
  27. =2613TarboroNorth Carolina, United States 0%0 of 266
  28. =2613SharonvilleOhio, United States 0%0 of 273
  29. =2613San FranciscoCalifornia, United States 0%0 of 264
  30. =2613San LeandroCalifornia, United States 0%0 of 281
  31. =2613Simi ValleyCalifornia, United States 0%0 of 281
  32. =2613West Valley CityUtah, United States 0%0 of 284
  33. =2613Arden-ArcadeCalifornia, United States 0%0 of 279
  34. =2613FujiyoshidaYamanashi, Japan 0%0 of 278
  35. =2635SanzhiTaipei, Taiwan 0%0 of 280
  36. =2635GuanshanTaiwan, Taiwan 0%0 of 281
  37. =2635OnoFukui, Japan 0%0 of 278
  38. =2635MatsumotoNagano, Japan 0%0 of 282
  39. =2635MatsudoChiba, Japan 0%0 of 282
  40. =2635IbiGifu, Japan 0%0 of 281
  41. =2635KumaEhime, Japan 0%0 of 282
  42. =2635ŌyauchiFukushima, Japan 0%0 of 273
  43. =2635NorwichEngland, United Kingdom 0%0 of 211
  44. =2635HorleyEngland, United Kingdom 0%0 of 267
  45. =2635PauNew Aquitaine, France 0%0 of 286
  46. =2635AvilésAsturias, Spain 0%0 of 283
  47. =2635AthloneLeinster, Ireland 0%0 of 275
  48. =2635Fort LauderdaleFlorida, United States 0%0 of 233
  49. =2635ElizabethtownKentucky, United States 0%0 of 283
  50. =2635PascagoulaMississippi, United States 0%0 of 278
  51. =2635AmamiKagoshima, Japan 0%0 of 266
  52. =2635YonoOsaka, Japan 0%0 of 271
  53. =2635Jordan SpringsNew South Wales, Australia 0%0 of 281
  54. =2654UenoharaYamanashi, Japan 0%0 of 270
  55. =2654FujiedaShizuoka, Japan 0%0 of 282
  56. =2654SendaiMiyagi, Japan 0%0 of 282
  57. =2654MobaraChiba, Japan 0%0 of 270
  58. =2654IchinosekiIwate, Japan 0%0 of 278
  59. =2654ArmidaleNew South Wales, Australia 0%0 of 258
  60. =2654LunelOccitanie, France 0%0 of 283
  61. =2654BastiaCorsica, France 0%0 of 286
  62. =2654FredrikstadØstfold, Norway 0%0 of 228
  63. =2654BrumunddalInnlandet, Norway 0%0 of 207
  64. =2654PaducahKentucky, United States 0%0 of 272
  65. =2654University CityMissouri, United States 0%0 of 285
  66. =2654LebanonOhio, United States 0%0 of 280
  67. =2654AnkenyIowa, United States 0%0 of 286
  68. =2654GridleyCalifornia, United States 0%0 of 271
  69. =2654IndioCalifornia, United States 0%0 of 286
  70. =2654Salt Lake CityUtah, United States 0%0 of 286
  71. =2654Oyabelast full day 22 SeptToyama, Japan 0%0 of 238
  72. =2672KastoriaWest Macedonia, Greece 0%0 of 203
  73. =2672UedaNagano, Japan 0%0 of 281
  74. =2672TateyamaChiba, Japan 0%0 of 272
  75. =2672SakaiminatoTottori, Japan 0%0 of 269
  76. =2672HamakitaShizuoka, Japan 0%0 of 275
  77. =2672AjikiChiba, Japan 0%0 of 274
  78. =2672GloucesterEngland, United Kingdom 0%0 of 276
  79. =2672EastbourneEngland, United Kingdom 0%0 of 274
  80. =2672BristolEngland, United Kingdom 0%0 of 276
  81. =2672Saint-ChamondAuvergne-Rhône-Alpes, France 0%0 of 268
  82. =2672AuxerreBourgogne-Franche-Comté, France 0%0 of 286
  83. =2672Lexington-FayetteKentucky, United States 0%0 of 283
  84. =2672LoudonTennessee, United States 0%0 of 265
  85. =2672BrookingsSouth Dakota, United States 0%0 of 283
  86. =2672BerkeleyCalifornia, United States 0%0 of 260
  87. =2672King CityCalifornia, United States 0%0 of 286
  88. =2672SalinasCalifornia, United States 0%0 of 270
  89. =2672ShawiniganQuebec, Canada 0%0 of 282
  90. =2672IzunokuniShizuoka, Japan 0%0 of 269
  91. =2672MotonaChiba, Japan 0%0 of 274
  92. =2692HengchunTaiwan, Taiwan 0%0 of 277
  93. =2692ImaichiTochigi, Japan 0%0 of 275
  94. =2692AnamizuIshikawa, Japan 0%0 of 263
  95. =2692YokoshibaChiba, Japan 0%0 of 272
  96. =2692WakuyaMiyagi, Japan 0%0 of 273
  97. =2692KōzakiChiba, Japan 0%0 of 273
  98. =2692IchinomiyaChiba, Japan 0%0 of 276
  99. =2692TamworthNew South Wales, Australia 0%0 of 249
  100. =2692TorreviejaValencia, Spain 0%0 of 254

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), 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).