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. =1701RambouilletÎle-de-France, France 0%1 of 278
  2. =1701TampaFlorida, United States 0%1 of 278
  3. =1701PoquosonVirginia, United States 0%1 of 278
  4. 1704QuimperBrittany, France 0%1 of 278
  5. 1705Kansas CityMissouri, United States 0%1 of 278
  6. 1706GainesvilleFlorida, United States 0%1 of 278
  7. 1707Haverhilllast full day 9 OctMassachusetts, United States 0%1 of 278
  8. 1708TournaiWallonia, Belgium 0%1 of 278
  9. 1709LanderWyoming, United States 0%1 of 278
  10. 1710ChattanoogaTennessee, United States 0%1 of 279
  11. 1711SpringdaleArkansas, United States 0%1 of 279
  12. 1712Žiar nad HronomBanská Bystrica Region, Slovakia 0%1 of 279
  13. 1713FréjusProvence-Alpes-Côte d'Azur, France 0%1 of 279
  14. 1714MiyakoIwate, Japan 0%1 of 279
  15. 1715MiyazuKyoto, Japan 0%1 of 279
  16. 1716CornwallOntario, Canada 0%1 of 279
  17. 1717RentonWashington, United States 0%1 of 279
  18. 1718UxbridgeMassachusetts, United States 0%1 of 279
  19. 1719Port CoquitlamBritish Columbia, Canada 0%1 of 279
  20. 1720MuanJeollanam-do, South Korea 0%1 of 280
  21. 1721Ciudad RealCastille-La Mancha, Spain 0%1 of 280
  22. 1722BizenOkayama, Japan 0%1 of 280
  23. 1723ThrakomakedónesAttica, Greece 0%1 of 280
  24. =1724KariyaHyōgo, Japan 0%1 of 280
  25. =1724AioiHyōgo, Japan 0%1 of 280
  26. 1726Aschaffenburglast full day 10 OctBavaria, Germany 0%1 of 280
  27. 1727Schwandorf in Bayernlast full day 10 OctBavaria, Germany 0%1 of 280
  28. 1728Bamberglast full day 10 OctBavaria, Germany 0%1 of 280
  29. 1729GotōNagasaki, Japan 0%1 of 280
  30. 1730GenkFlanders, Belgium 0%1 of 280
  31. 1731Aachenlast full day 10 OctNorth Rhine-Westphalia, Germany 0%1 of 280
  32. 1732Sunland ParkNew Mexico, United States 0%1 of 280
  33. 1733Daytona BeachFlorida, United States 0%1 of 280
  34. 1734YongkangTaiwan, Taiwan 0%1 of 281
  35. 1735NeiliTaiwan, Taiwan 0%1 of 281
  36. 1736AthensAttica, Greece 0%1 of 281
  37. 1737Žďár nad SázavouVysocina, Czechia 0%1 of 281
  38. 1738CoulommiersÎle-de-France, France 0%1 of 281
  39. 1739Iowa CityIowa, United States 0%1 of 281
  40. 1740DreuxCentre-Val de Loire, France 0%1 of 281
  41. 1741HakodateHokkaido, Japan 0%1 of 281
  42. 1742SalemVirginia, United States 0%1 of 281
  43. 1743ÉtampesÎle-de-France, France 0%1 of 281
  44. 1744FairbanksAlaska, United States 0%1 of 281
  45. 1745Rouyn-NorandaQuebec, Canada 0%1 of 281
  46. 1746FukuyamaHiroshima, Japan 0%1 of 282
  47. 1747SninaPrešov Region, Slovakia 0%1 of 282
  48. 1748ShidoKagawa, Japan 0%1 of 282
  49. 1749TsushimaNagasaki, Japan 0%1 of 282
  50. 1750Warsteinlast full day 10 OctNorth Rhine-Westphalia, Germany 0%1 of 282
  51. 1751TatsunoHyōgo, Japan 0%1 of 282
  52. 1752FreiburgBaden-Wurttemberg, Germany 0%1 of 282
  53. =1753SarcellesÎle-de-France, France 0%1 of 282
  54. =1753MorouraSaga, Japan 0%1 of 282
  55. 1755JerseyvilleIllinois, United States 0%1 of 282
  56. 1756YumaArizona, United States 0%1 of 282
  57. 1757Trois-RivièresQuebec, Canada 0%1 of 282
  58. =1758Safety HarborFlorida, United States 0%1 of 282
  59. =1758RooseveltUtah, United States 0%1 of 282
  60. 1760North ChicopeeMassachusetts, United States 0%1 of 282
  61. 1761ChehalisWashington, United States 0%1 of 282
  62. 1762Sankt ValentinLower Austria, Austria 0%1 of 283
  63. 1763LaivesTrentino-Alto Adige, Italy 0%1 of 283
  64. 1764PasadenaTexas, United States 0%1 of 283
  65. 1765SandersvilleGeorgia, United States 0%1 of 283
  66. 1766Herrsching am AmmerseeBavaria, Germany 0%1 of 283
  67. 1767MontaubanOccitanie, France 0%1 of 283
  68. 1768Sorel-TracyQuebec, Canada 0%1 of 283
  69. 1769VannesBrittany, France 0%1 of 283
  70. 1770LetterkennyUlster, Ireland 0%1 of 283
  71. 1771CanberraAustralian Capital Territory, Australia 0%1 of 283
  72. =1772FraminghamMassachusetts, United States 0%1 of 283
  73. =1772LowellMassachusetts, United States 0%1 of 283
  74. 1774BathurstNew Brunswick, Canada 0%1 of 283
  75. 1775ZapopanJalisco, Mexico 0%1 of 284
  76. 1776ContesProvence-Alpes-Côte d'Azur, France 0%1 of 284
  77. 1777WaterlooIowa, United States 0%1 of 284
  78. 1778Wood RiverIllinois, United States 0%1 of 284
  79. 1779TopekaKansas, United States 0%1 of 284
  80. 1780SavannahGeorgia, United States 0%1 of 284
  81. =1781ChesapeakeVirginia, United States 0%1 of 284
  82. =1781ClintonIowa, United States 0%1 of 284
  83. =1783La Roche-sur-YonPays de la Loire, France 0%1 of 284
  84. =1783BrunswickGeorgia, United States 0%1 of 284
  85. 1785Roanoke RapidsNorth Carolina, United States 0%1 of 284
  86. 1786GroßalmerodeHesse, Germany 0%1 of 284
  87. 1787GreenfieldMassachusetts, United States 0%1 of 284
  88. 1788Syracuselast full day 11 OctNew York, United States 0%1 of 284
  89. 1789LondonderryNew Hampshire, United States 0%1 of 284
  90. 1790San AntonioTexas, United States 0%1 of 285
  91. 1791GijónAsturias, Spain 0%1 of 285
  92. 1792Romans-sur-IsèreAuvergne-Rhône-Alpes, France 0%1 of 285
  93. 1793Upper AltonIllinois, United States 0%1 of 285
  94. 1794StabroekFlanders, Belgium 0%1 of 285
  95. =1795BirrLeinster, Ireland 0%1 of 285
  96. =1795DavenportIowa, United States 0%1 of 285
  97. 1797Short PumpVirginia, United States 0%1 of 285
  98. 1798CaenNormandy, France 0%1 of 285
  99. =1799PérigueuxNew Aquitaine, France 0%1 of 285
  100. =1799LimogesNew Aquitaine, France 0%1 of 285

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).