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. =2401TaitungTaiwan, Taiwan 0%0 of 281
  2. =2401ToyotaAichi, Japan 0%0 of 282
  3. =2401ToyonakaOsaka, Japan 0%0 of 282
  4. =2401TokorozawaSaitama, Japan 0%0 of 257
  5. =2401ShimaMie, Japan 0%0 of 281
  6. =2401SetoAichi, Japan 0%0 of 275
  7. =2401SabaeFukui, Japan 0%0 of 282
  8. =2401OdawaraKanagawa, Japan 0%0 of 255
  9. =2401ObuseNagano, Japan 0%0 of 276
  10. =2401Masudalast full day 11 OctShimane, Japan 0%0 of 275
  11. =2401MachidaTokyo, Japan 0%0 of 282
  12. =2401KawagoeSaitama, Japan 0%0 of 282
  13. =2401KasukabeSaitama, Japan 0%0 of 281
  14. =2401InoKochi, Japan 0%0 of 244
  15. =2401HakuiIshikawa, Japan 0%0 of 269
  16. =2401HadanoKanagawa, Japan 0%0 of 275
  17. =2401FurukawamenNagasaki, Japan 0%0 of 278
  18. =2401SayamaSaitama, Japan 0%0 of 282
  19. =2401SakamotoMiyagi, Japan 0%0 of 282
  20. =2401IchiharaChiba, Japan 0%0 of 281
  21. =2401HachinoheAomori, Japan 0%0 of 275
  22. =2401Kingston upon HullEngland, United Kingdom 0%0 of 215
  23. =2401Fos-sur-MerProvence-Alpes-Côte d'Azur, France 0%0 of 282
  24. =2401GetxoBasque Country, Spain 0%0 of 282
  25. =2401AzpeitiaBasque Country, Spain 0%0 of 282
  26. =2401BessemerAlabama, United States 0%0 of 280
  27. =2401SomersetKentucky, United States 0%0 of 282
  28. =2401Saint JosephMissouri, United States 0%0 of 278
  29. =2401BeltonTexas, United States 0%0 of 275
  30. =2401Alta SierraCalifornia, United States 0%0 of 286
  31. =2401MantecaCalifornia, United States 0%0 of 271
  32. =2401L'Ancienne-LoretteQuebec, Canada 0%0 of 274
  33. =2401MinokamoGifu, Japan 0%0 of 274
  34. =2401SennanOsaka, Japan 0%0 of 272
  35. =2435YanagawaFukuoka, Japan 0%0 of 278
  36. =2435ŌtsuShiga, Japan 0%0 of 282
  37. =2435Ōdachō-ōdalast full day 11 OctShimane, Japan 0%0 of 274
  38. =2435ObamaFukui, Japan 0%0 of 276
  39. =2435KomatsuIshikawa, Japan 0%0 of 271
  40. =2435KitahamaShiga, Japan 0%0 of 256
  41. =2435KamakuraKanagawa, Japan 0%0 of 273
  42. =2435IseharaKanagawa, Japan 0%0 of 274
  43. =2435HiratsukaKanagawa, Japan 0%0 of 270
  44. =2435GotembaShizuoka, Japan 0%0 of 274
  45. =2435AnjōAichi, Japan 0%0 of 271
  46. =2435ShinjōYamagata, Japan 0%0 of 245
  47. =2435Ōuchilast full day 8 OctMiyagi, Japan 0%0 of 277
  48. =2435Toongabbie WestNew South Wales, Australia 0%0 of 277
  49. =2435GranadaAndalusia, Spain 0%0 of 280
  50. =2435ToulouseOccitanie, France 0%0 of 286
  51. =2435NîmesOccitanie, France 0%0 of 286
  52. =2435JasperIndiana, United States 0%0 of 282
  53. =2435New AlbanyIndiana, United States 0%0 of 268
  54. =2435OlatheKansas, United States 0%0 of 286
  55. =2435AthensTennessee, United States 0%0 of 278
  56. =2435KaufmanTexas, United States 0%0 of 268
  57. =2435Charlestonlast full day 10 OctWest Virginia, United States 0%0 of 278
  58. =2435Fort DodgeIowa, United States 0%0 of 276
  59. =2435PowayCalifornia, United States 0%0 of 283
  60. =2435StocktonCalifornia, United States 0%0 of 279
  61. =2435BandōIbaraki, Japan 0%0 of 276
  62. =2435InashikiIbaraki, Japan 0%0 of 250
  63. =2463YaitaTochigi, Japan 0%0 of 248
  64. =2463NagaokaNiigata, Japan 0%0 of 270
  65. =2463MinanoSaitama, Japan 0%0 of 271
  66. =2463Kaseda-shirakameKagoshima, Japan 0%0 of 274
  67. =2463KanumaTochigi, Japan 0%0 of 275
  68. =2463Gōtsuchōlast full day 11 OctShimane, Japan 0%0 of 275
  69. =2463FujisawaKanagawa, Japan 0%0 of 275
  70. =2463YotsukaidōChiba, Japan 0%0 of 274
  71. =2463Tagajō-shiMiyagi, Japan 0%0 of 282
  72. =2463HigashineYamagata, Japan 0%0 of 239
  73. =2463MuroranHokkaido, Japan 0%0 of 224
  74. =2463TuggeranongAustralian Capital Territory, Australia 0%0 of 282
  75. =2463UtielValencia, Spain 0%0 of 246
  76. =2463Caravacalast full day 11 OctMurcia, Spain 0%0 of 233
  77. =2463SheffieldEngland, United Kingdom 0%0 of 274
  78. =2463ReutteTyrol, Austria 0%0 of 285
  79. =2463Mont-de-MarsanNew Aquitaine, France 0%0 of 263
  80. =2463CastresOccitanie, France 0%0 of 286
  81. =2463Aix-en-ProvenceProvence-Alpes-Côte d'Azur, France 0%0 of 286
  82. =2463Mosslast full day 14 SeptØstfold, Norway 0%0 of 209
  83. =2463AcariRio de Janeiro, Brazil 0%0 of 279
  84. =2463PrichardAlabama, United States 0%0 of 276
  85. =2463Bonita SpringsFlorida, United States 0%0 of 274
  86. =2463Saint MatthewsKentucky, United States 0%0 of 285
  87. =2463Lemaylast full day 5 OctMissouri, United States 0%0 of 272
  88. =2463ClaytonNorth Carolina, United States 0%0 of 274
  89. =2463KumanoMie, Japan 0%0 of 279
  90. =2463YachiyoChiba, Japan 0%0 of 279
  91. =2463HigashimatsushimaMiyagi, Japan 0%0 of 282
  92. =2463NisshinAichi, Japan 0%0 of 257
  93. =2463SadoNiigata, Japan 0%0 of 270
  94. =2463NoboritoKanagawa, Japan 0%0 of 274
  95. =2495Hualien CityTaiwan, Taiwan 0%0 of 281
  96. =2495UrayasuChiba, Japan 0%0 of 282
  97. =2495ShinshiroAichi, Japan 0%0 of 245
  98. =2495ŌmeTokyo, Japan 0%0 of 265
  99. =2495NanaoIshikawa, Japan 0%0 of 272
  100. =2495Kameda-honchōNiigata, Japan 0%0 of 277

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).