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. 2282MinamichitaAichi, Japan 0%0 of 259
  2. =2302YonagoTottori, Japan 0%0 of 280
  3. =2302Ureshinomachi-shimojukuSaga, Japan 0%0 of 282
  4. =2302TsukumiuraOita, Japan 0%0 of 275
  5. =2302TsuMie, Japan 0%0 of 282
  6. =2302ToyohashiAichi, Japan 0%0 of 278
  7. =2302MiyoshiHiroshima, Japan 0%0 of 280
  8. =2302MatsutōIshikawa, Japan 0%0 of 272
  9. =2302MaizuruKyoto, Japan 0%0 of 278
  10. =2302KushikinoKagoshima, Japan 0%0 of 273
  11. =2302KurihamaKanagawa, Japan 0%0 of 275
  12. =2302Kamojimachō-jōgejimaTokushima, Japan 0%0 of 266
  13. =2302IchinomiyaAichi, Japan 0%0 of 282
  14. =2302HonjōSaitama, Japan 0%0 of 271
  15. =2302HōfuYamaguchi, Japan 0%0 of 281
  16. =2302HirakataOsaka, Japan 0%0 of 275
  17. =2302ChitoseHokkaido, Japan 0%0 of 273
  18. =2302CardiffWales, United Kingdom 0%0 of 205
  19. =2302SteyrUpper Austria, Austria 0%0 of 275
  20. =2302NantesPays de la Loire, France 0%0 of 286
  21. =2302HuntsvilleAlabama, United States 0%0 of 285
  22. =2302Ponte Vedra BeachFlorida, United States 0%0 of 286
  23. =2302New OrleansLouisiana, United States 0%0 of 284
  24. =2302MurraysvilleNorth Carolina, United States 0%0 of 235
  25. =2302EdmondOklahoma, United States 0%0 of 270
  26. =2302San JoseCalifornia, United States 0%0 of 286
  27. =2302Tonamilast full day 22 SeptToyama, Japan 0%0 of 253
  28. =2302Kawachi-NaganoOsaka, Japan 0%0 of 271
  29. =2302SaitamaSaitama, Japan 0%0 of 282
  30. =2302YawatahamaEhime, Japan 0%0 of 282
  31. =2302IgaMie, Japan 0%0 of 282
  32. =2302AmaAichi, Japan 0%0 of 269
  33. =2302KodairaTokyo, Japan 0%0 of 272
  34. =2334AtsugiKanagawa, Japan 0%0 of 275
  35. =2334YokohamaKanagawa, Japan 0%0 of 275
  36. =2334UtsunomiyaTochigi, Japan 0%0 of 269
  37. =2334TokushimaTokushima, Japan 0%0 of 281
  38. =2334TobaMie, Japan 0%0 of 280
  39. =2334KumagayaSaitama, Japan 0%0 of 281
  40. =2334IsahayaNagasaki, Japan 0%0 of 280
  41. =2334IkomaNara, Japan 0%0 of 271
  42. =2334HannōSaitama, Japan 0%0 of 272
  43. =2334FujiShizuoka, Japan 0%0 of 282
  44. =2334AkiKochi, Japan 0%0 of 261
  45. =2334YoshiokaMiyagi, Japan 0%0 of 276
  46. =2334YonezawaYamagata, Japan 0%0 of 243
  47. =2334SakuraChiba, Japan 0%0 of 281
  48. =2334MoriokaIwate, Japan 0%0 of 275
  49. =2334EnniscorthyLeinster, Ireland 0%0 of 253
  50. =2334VerdunGrand Est, France 0%0 of 277
  51. =2334AnnemasseAuvergne-Rhône-Alpes, France 0%0 of 286
  52. =2334GainesvilleGeorgia, United States 0%0 of 268
  53. =2334HernandoMississippi, United States 0%0 of 286
  54. =2334DentsvilleSouth Carolina, United States 0%0 of 286
  55. =2334GreenvilleSouth Carolina, United States 0%0 of 284
  56. =2334KnoxvilleTennessee, United States 0%0 of 286
  57. =2334College StationTexas, United States 0%0 of 258
  58. =2334NogalesArizona, United States 0%0 of 281
  59. =2334Santa ClaritaCalifornia, United States 0%0 of 274
  60. =2334TurlockCalifornia, United States 0%0 of 275
  61. =2334OdessaTexas, United States 0%0 of 271
  62. =2334AzaminoKanagawa, Japan 0%0 of 275
  63. =2334YameFukuoka, Japan 0%0 of 280
  64. =2334KizugawaKyoto, Japan 0%0 of 256
  65. =2365Yasugichōlast full day 11 OctShimane, Japan 0%0 of 277
  66. =2365YanaiYamaguchi, Japan 0%0 of 278
  67. =2365TondabayashichōOsaka, Japan 0%0 of 275
  68. =2365TakinomiyaKagawa, Japan 0%0 of 258
  69. =2365TajimiGifu, Japan 0%0 of 280
  70. =2365SaikiOita, Japan 0%0 of 280
  71. =2365ObitaNagasaki, Japan 0%0 of 279
  72. =2365NumazuShizuoka, Japan 0%0 of 282
  73. =2365Nara-shiNara, Japan 0%0 of 272
  74. =2365NagasakiNagasaki, Japan 0%0 of 280
  75. =2365MitaiMiyazaki, Japan 0%0 of 280
  76. =2365KashiwaChiba, Japan 0%0 of 281
  77. =2365KaminokawaTochigi, Japan 0%0 of 270
  78. =2365GobōWakayama, Japan 0%0 of 278
  79. =2365KimitsuChiba, Japan 0%0 of 281
  80. =2365ChibaChiba, Japan 0%0 of 281
  81. =2365RotherhamEngland, United Kingdom 0%0 of 276
  82. =2365TarbesOccitanie, France 0%0 of 277
  83. =2365Montceau-les-MinesBourgogne-Franche-Comté, France 0%0 of 282
  84. =2365MontargisCentre-Val de Loire, France 0%0 of 286
  85. =2365HernaniBasque Country, Spain 0%0 of 274
  86. =2365Ferry Passlast full day 7 OctFlorida, United States 0%0 of 239
  87. =2365Baton RougeLouisiana, United States 0%0 of 267
  88. =2365PrienLouisiana, United States 0%0 of 274
  89. =2365ClevelandMississippi, United States 0%0 of 282
  90. =2365ClemmonsNorth Carolina, United States 0%0 of 286
  91. =2365HendersonvilleTennessee, United States 0%0 of 279
  92. =2365Jacksonlast full day 8 OctTennessee, United States 0%0 of 278
  93. =2365GalvestonTexas, United States 0%0 of 275
  94. =2365KagaIshikawa, Japan 0%0 of 269
  95. =2365YamatoKanagawa, Japan 0%0 of 275
  96. =2365HigashikurumeTokyo, Japan 0%0 of 256
  97. =2365FuchūTokyo, Japan 0%0 of 280
  98. =2365KamagayaChiba, Japan 0%0 of 280
  99. =2365YoshinogawaTokushima, Japan 0%0 of 253
  100. =2365Unnanlast full day 11 OctShimane, Japan 0%0 of 276

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.

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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).