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. =2084FayettevilleNorth Carolina, United States 0%0 of 232
  2. =2084LexingtonNorth Carolina, United States 0%0 of 268
  3. =2084BartlettTennessee, United States 0%0 of 274
  4. =2084BurbankCalifornia, United States 0%0 of 276
  5. =2084TakashimaShiga, Japan 0%0 of 260
  6. =2084HiragiKagawa, Japan 0%0 of 278
  7. =2084ShūnanYamaguchi, Japan 0%0 of 282
  8. =2108YukuhashiFukuoka, Japan 0%0 of 275
  9. =2108TsurusakiOita, Japan 0%0 of 273
  10. =2108TatebayashiGunma, Japan 0%0 of 259
  11. =2108HikariYamaguchi, Japan 0%0 of 282
  12. =2108MontpellierOccitanie, France 0%0 of 286
  13. =2108GardanneProvence-Alpes-Côte d'Azur, France 0%0 of 281
  14. =2108AmorebietaBasque Country, Spain 0%0 of 284
  15. =2108AthensGeorgia, United States 0%0 of 286
  16. =2108JacksonMississippi, United States 0%0 of 286
  17. =2108NashvilleTennessee, United States 0%0 of 228
  18. =2108ConroeTexas, United States 0%0 of 274
  19. =2108ChikuseiIbaraki, Japan 0%0 of 274
  20. =2108Candler-McAfeeGeorgia, United States 0%0 of 277
  21. =2121Veľká LomnicaPrešov Region, Slovakia 0%0 of 281
  22. =2121ShibukawaGunma, Japan 0%0 of 271
  23. =2121Nichinanlast full day 10 OctMiyazaki, Japan 0%0 of 276
  24. =2121NagahamaShiga, Japan 0%0 of 279
  25. =2121MenumaSaitama, Japan 0%0 of 282
  26. =2121KobayashiMiyazaki, Japan 0%0 of 281
  27. =2121KanoyaKagoshima, Japan 0%0 of 271
  28. =2121IkarugaHyōgo, Japan 0%0 of 272
  29. =2121HashimotoWakayama, Japan 0%0 of 277
  30. =2121FukuchiyamaKyoto, Japan 0%0 of 277
  31. =2121NagatoYamaguchi, Japan 0%0 of 282
  32. =2121Fontaine-lès-DijonBourgogne-Franche-Comté, France 0%0 of 208
  33. =2121AnnecyAuvergne-Rhône-Alpes, France 0%0 of 242
  34. =2121BeasainBasque Country, Spain 0%0 of 285
  35. =2121GuaratinguetáSão Paulo, Brazil 0%0 of 247
  36. =2121BirminghamAlabama, United States 0%0 of 282
  37. =2121AtlantaGeorgia, United States 0%0 of 283
  38. =2121LouisvilleKentucky, United States 0%0 of 284
  39. =2121Chula VistaCalifornia, United States 0%0 of 284
  40. =2121NiizaSaitama, Japan 0%0 of 281
  41. =2121InabeMie, Japan 0%0 of 281
  42. =2121WakasugiFukuoka, Japan 0%0 of 278
  43. =2121MimaTokushima, Japan 0%0 of 260
  44. =2144YoukaichiShiga, Japan 0%0 of 277
  45. =2144SakadoSaitama, Japan 0%0 of 282
  46. =2144NagoyaAichi, Japan 0%0 of 282
  47. =2144KukichūōSaitama, Japan 0%0 of 282
  48. =2144KofuYamanashi, Japan 0%0 of 280
  49. =2144KochiKochi, Japan 0%0 of 271
  50. =2144IzumisanoOsaka, Japan 0%0 of 271
  51. =2144IgusaSaitama, Japan 0%0 of 281
  52. =2144HimejiHyōgo, Japan 0%0 of 279
  53. =2144HijiOita, Japan 0%0 of 225
  54. =2144AyabeKyoto, Japan 0%0 of 279
  55. =2144AgeoSaitama, Japan 0%0 of 257
  56. =2144ShiroishiMiyagi, Japan 0%0 of 281
  57. =2144SagaeYamagata, Japan 0%0 of 263
  58. =2144SwanseaWales, United Kingdom 0%0 of 263
  59. =2144Weidenlast full day 10 OctBavaria, Germany 0%0 of 280
  60. =2144Biberach an der RißBaden-Wurttemberg, Germany 0%0 of 276
  61. =2144Presidente PrudenteSão Paulo, Brazil 0%0 of 258
  62. =2144Kendale LakesFlorida, United States 0%0 of 279
  63. =2144Saint AndrewsSouth Carolina, United States 0%0 of 279
  64. =2144Mission ViejoCalifornia, United States 0%0 of 286
  65. =2144Misato, SaitamaSaitama, Japan 0%0 of 270
  66. =2144HashimaGifu, Japan 0%0 of 278
  67. =2144MunakataFukuoka, Japan 0%0 of 227
  68. =2168KozániWest Macedonia, Greece 0%0 of 285
  69. =2168ShingūWakayama, Japan 0%0 of 278
  70. =2168ToyookaHyōgo, Japan 0%0 of 280
  71. =2168TosuSaga, Japan 0%0 of 280
  72. =2168TanabeWakayama, Japan 0%0 of 267
  73. =2168SōkaSaitama, Japan 0%0 of 270
  74. =2168SaikūMie, Japan 0%0 of 282
  75. =2168ŌtaGunma, Japan 0%0 of 271
  76. =2168NakatsuOita, Japan 0%0 of 280
  77. =2168Nakamalast full day 11 OctFukuoka, Japan 0%0 of 234
  78. =2168KobeHyōgo, Japan 0%0 of 282
  79. =2168KiryūGunma, Japan 0%0 of 269
  80. =2168KaratsuSaga, Japan 0%0 of 280
  81. =2168KakamigaharaGifu, Japan 0%0 of 281
  82. =2168HanyūSaitama, Japan 0%0 of 282
  83. =2168HandaAichi, Japan 0%0 of 275
  84. =2168GionHiroshima, Japan 0%0 of 280
  85. =2168ChigasakiKanagawa, Japan 0%0 of 263
  86. =2168AiharaKanagawa, Japan 0%0 of 282
  87. =2168MarseilleProvence-Alpes-Côte d'Azur, France 0%0 of 286
  88. =2168CannesProvence-Alpes-Côte d'Azur, France 0%0 of 283
  89. =2168OriaBasque Country, Spain 0%0 of 283
  90. =2168PollaCampania, Italy 0%0 of 262
  91. =2168GadsdenAlabama, United States 0%0 of 274
  92. =2168JeffersonvilleIndiana, United States 0%0 of 284
  93. =2168HattiesburgMississippi, United States 0%0 of 286
  94. =2168CincinnatiOhio, United States 0%0 of 285
  95. =2168Oklahoma CityOklahoma, United States 0%0 of 249
  96. =2168North CharlestonSouth Carolina, United States 0%0 of 285
  97. =2168DentonTexas, United States 0%0 of 256
  98. =2168MillcreekUtah, United States 0%0 of 286
  99. =2168Midwaylast full day 6 OctFlorida, United States 0%0 of 259
  100. =2168AyaseKanagawa, Japan 0%0 of 238

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).