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. =1900NiihamaEhime, Japan 0%0 of 279
  2. =1900HighlandsTexas, United States 0%0 of 278
  3. =1903SofiaSofia-Capital, Bulgaria 0%0 of 280
  4. =1903ToufenTaiwan, Taiwan 0%0 of 276
  5. =1903Melunlast full day 17 SeptÎle-de-France, France 0%0 of 257
  6. =1903PaulíniaSão Paulo, Brazil 0%0 of 281
  7. =1903GarcíaNuevo León, Mexico 0%0 of 257
  8. =1903ComptonCalifornia, United States 0%0 of 275
  9. =1903Los AngelesCalifornia, United States 0%0 of 280
  10. =1903KamisuIbaraki, Japan 0%0 of 274
  11. =1911OnodaYamaguchi, Japan 0%0 of 282
  12. =1911KurashikiOkayama, Japan 0%0 of 282
  13. =1913Tanushimarumachi-toyokiFukuoka, Japan 0%0 of 267
  14. =1913ŌmutaFukuoka, Japan 0%0 of 278
  15. =1913Maebaru-chūōlast full day 7 OctFukuoka, Japan 0%0 of 270
  16. =1913CampinasSão Paulo, Brazil 0%0 of 270
  17. =1913Little RockArkansas, United States 0%0 of 284
  18. =1913AustinTexas, United States 0%0 of 281
  19. =1913OwariasahiAichi, Japan 0%0 of 278
  20. =1920AsprópyrgosAttica, Greece 0%0 of 281
  21. =1920ZhudongTaiwan, Taiwan 0%0 of 275
  22. =1920ShikokuchūōEhime, Japan 0%0 of 282
  23. =1923TamanoOkayama, Japan 0%0 of 280
  24. =1923FukuokaFukuoka, Japan 0%0 of 277
  25. =1923Deuchendorflast full day 24 SeptStyria, Austria 0%0 of 266
  26. =1923WheelersburgOhio, United States 0%0 of 284
  27. =1923HigashihiroshimaHiroshima, Japan 0%0 of 280
  28. =1928TakamatsuKagawa, Japan 0%0 of 282
  29. =1928PiracicabaSão Paulo, Brazil 0%0 of 238
  30. =1928BauruSão Paulo, Brazil 0%0 of 261
  31. =1928MarionArkansas, United States 0%0 of 281
  32. =1928SpartanburgSouth Carolina, United States 0%0 of 280
  33. =1928HyūgaMiyazaki, Japan 0%0 of 280
  34. =1934Tottori-shiTottori, Japan 0%0 of 269
  35. =1934TakanabeMiyazaki, Japan 0%0 of 278
  36. =1934TaharaAichi, Japan 0%0 of 279
  37. =1934Kakogawachō-honmachiHyōgo, Japan 0%0 of 282
  38. =1938KasaokaOkayama, Japan 0%0 of 279
  39. =1938HigashiosakaOsaka, Japan 0%0 of 268
  40. =1938HayashimaOkayama, Japan 0%0 of 282
  41. =1938Liezenlast full day 24 SeptStyria, Austria 0%0 of 265
  42. =1938ZallaBasque Country, Spain 0%0 of 260
  43. =1938AraoKumamoto, Japan 0%0 of 274
  44. =1944Isaccealast full day 10 OctTulcea County, Romania 0%0 of 282
  45. =1944HigashinozoeHyōgo, Japan 0%0 of 282
  46. =1944IshinomakiMiyagi, Japan 0%0 of 281
  47. =1944AmstettenLower Austria, Austria 0%0 of 283
  48. =1944AvignonProvence-Alpes-Côte d'Azur, France 0%0 of 286
  49. =1944SalernoCampania, Italy 0%0 of 255
  50. =1944HigashigōSaga, Japan 0%0 of 281
  51. =1944Kogalast full day 11 OctFukuoka, Japan 0%0 of 275
  52. =1944AsakuchiOkayama, Japan 0%0 of 282
  53. =1953KeelungTaiwan, Taiwan 0%0 of 281
  54. =1953ShimogamoOkayama, Japan 0%0 of 280
  55. =1953MiyakonojōMiyazaki, Japan 0%0 of 281
  56. =1953Kitakyushulast full day 11 OctFukuoka, Japan 0%0 of 276
  57. =1953AostaAosta Valley, Italy 0%0 of 286
  58. =1953Attnang-PuchheimUpper Austria, Austria 0%0 of 286
  59. =1953NogalesSonora, Mexico 0%0 of 286
  60. =1953TulsaOklahoma, United States 0%0 of 210
  61. =1953MatsuuraNagasaki, Japan 0%0 of 277
  62. =1962TenriNara, Japan 0%0 of 278
  63. =1962MinatoWakayama, Japan 0%0 of 282
  64. =1962MarugameKagawa, Japan 0%0 of 282
  65. =1962KureHiroshima, Japan 0%0 of 282
  66. =1962AmagasakiHyōgo, Japan 0%0 of 282
  67. =1962CuencaCastille-La Mancha, Spain 0%0 of 256
  68. =1962Taubatélast full day 8 OctSão Paulo, Brazil 0%0 of 226
  69. =1969ZentsujichóKagawa, Japan 0%0 of 282
  70. =1969SōjaOkayama, Japan 0%0 of 282
  71. =1969Shimo-tsumaIbaraki, Japan 0%0 of 242
  72. =1969ŌzuKumamoto, Japan 0%0 of 274
  73. =1969KariyaAichi, Japan 0%0 of 282
  74. =1969San RoqueAndalusia, Spain 0%0 of 279
  75. =1969Lorcalast full day 11 OctMurcia, Spain 0%0 of 233
  76. =1969LienzTyrol, Austria 0%0 of 286
  77. =1969WichitaKansas, United States 0%0 of 283
  78. =1969FlatwoodsKentucky, United States 0%0 of 282
  79. =1969ClovisCalifornia, United States 0%0 of 278
  80. =1969PortervilleCalifornia, United States 0%0 of 280
  81. =1969KaniGifu, Japan 0%0 of 280
  82. =1969KotōKumamoto, Japan 0%0 of 276
  83. =1983VarnaVarna, Bulgaria 0%0 of 279
  84. =1983YawataKyoto, Japan 0%0 of 278
  85. =1983TamanaKumamoto, Japan 0%0 of 272
  86. =1983SusakiKochi, Japan 0%0 of 257
  87. =1983ŌtakeHiroshima, Japan 0%0 of 282
  88. =1983NobeokaMiyazaki, Japan 0%0 of 280
  89. =1983KumamotoKumamoto, Japan 0%0 of 272
  90. =1983Kandalast full day 11 OctFukuoka, Japan 0%0 of 273
  91. =1983IwadeWakayama, Japan 0%0 of 282
  92. =1983ItoigawaNiigata, Japan 0%0 of 241
  93. =1983Imarichō-kōSaga, Japan 0%0 of 282
  94. =1983MatsuyamaEhime, Japan 0%0 of 277
  95. =1983ValenciaValencia, Spain 0%0 of 254
  96. =1983RognacProvence-Alpes-Côte d'Azur, France 0%0 of 280
  97. =1983DurangoBasque Country, Spain 0%0 of 284
  98. =1983NorwoodOhio, United States 0%0 of 281
  99. =1983Santa MonicaCalifornia, United States 0%0 of 286
  100. 2000YilanTaiwan, Taiwan 0%0 of 278

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).