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. =2692Stoke-on-TrentEngland, United Kingdom 0%0 of 213
  2. =2692PeterboroughEngland, United Kingdom 0%0 of 276
  3. =2692MiddlewichEngland, United Kingdom 0%0 of 276
  4. =2692MansfieldEngland, United Kingdom 0%0 of 276
  5. =2692HalesworthEngland, United Kingdom 0%0 of 201
  6. =2692BorehamwoodEngland, United Kingdom 0%0 of 272
  7. =2692Oberviechtachlast full day 10 OctBavaria, Germany 0%0 of 273
  8. =2692ChambéryAuvergne-Rhône-Alpes, France 0%0 of 284
  9. =2692ZarautzBasque Country, Spain 0%0 of 261
  10. =2692SamaAsturias, Spain 0%0 of 285
  11. =2692Biograd na MoruZadar, Croatia 0%0 of 276
  12. =2692Fruit CoveFlorida, United States 0%0 of 240
  13. =2692Oak RidgeFlorida, United States 0%0 of 282
  14. =2692Valricolast full day 11 OctFlorida, United States 0%0 of 266
  15. =2692DyersburgTennessee, United States 0%0 of 278
  16. =2692DavisCalifornia, United States 0%0 of 280
  17. =2692VallejoCalifornia, United States 0%0 of 264
  18. =2692NasukarasuyamaTochigi, Japan 0%0 of 265
  19. =2692KaizuGifu, Japan 0%0 of 275
  20. =2692KisoNagano, Japan 0%0 of 282
  21. =2721OwaseMie, Japan 0%0 of 279
  22. =2721OgawamachiSaitama, Japan 0%0 of 281
  23. =2721MakiNiigata, Japan 0%0 of 269
  24. =2721KitaibarakiIbaraki, Japan 0%0 of 280
  25. =2721KawasakiMiyagi, Japan 0%0 of 269
  26. =2721CártamaAndalusia, Spain 0%0 of 242
  27. =2721BelfastNorthern Ireland, United Kingdom 0%0 of 213
  28. =2721Lüdenscheidlast full day 10 OctNorth Rhine-Westphalia, Germany 0%0 of 277
  29. =2721Saint-ÉtienneAuvergne-Rhône-Alpes, France 0%0 of 283
  30. =2721Saint-DizierGrand Est, France 0%0 of 277
  31. =2721NeversBourgogne-Franche-Comté, France 0%0 of 286
  32. =2721Montoir-de-BretagnePays de la Loire, France 0%0 of 286
  33. =2721La RochelleNew Aquitaine, France 0%0 of 264
  34. =2721Joué-lès-ToursCentre-Val de Loire, France 0%0 of 276
  35. =2721ÉpernayGrand Est, France 0%0 of 277
  36. =2721DijonBourgogne-Franche-Comté, France 0%0 of 256
  37. =2721BourgesCentre-Val de Loire, France 0%0 of 282
  38. =2721AlençonNormandy, France 0%0 of 282
  39. =2721Rio de JaneiroRio de Janeiro, Brazil 0%0 of 283
  40. =2721Palm CityFlorida, United States 0%0 of 277
  41. =2721St. PetersburgFlorida, United States 0%0 of 278
  42. =2721NicholasvilleKentucky, United States 0%0 of 281
  43. =2721DurhamNorth Carolina, United States 0%0 of 285
  44. =2721CarpinteriaCalifornia, United States 0%0 of 259
  45. =2721GuadalupeCalifornia, United States 0%0 of 282
  46. =2721OceanoCalifornia, United States 0%0 of 282
  47. =2721RosevilleCalifornia, United States 0%0 of 271
  48. =2721SacramentoCalifornia, United States 0%0 of 286
  49. =2721ChikumaNagano, Japan 0%0 of 281
  50. =2721MinamiashigaraKanagawa, Japan 0%0 of 267
  51. =2751Niitsu-honchōNiigata, Japan 0%0 of 241
  52. =2751ŌamiChiba, Japan 0%0 of 243
  53. =2751ImminghamEngland, United Kingdom 0%0 of 276
  54. =2751DerbyEngland, United Kingdom 0%0 of 276
  55. =2751LongfordLeinster, Ireland 0%0 of 283
  56. =2751RoussillonAuvergne-Rhône-Alpes, France 0%0 of 259
  57. =2751LourdesOccitanie, France 0%0 of 285
  58. =2751ChâteaurouxCentre-Val de Loire, France 0%0 of 286
  59. =2751FairhopeAlabama, United States 0%0 of 260
  60. =2751Warringtonlast full day 6 OctFlorida, United States 0%0 of 267
  61. =2751RutlandVermont, United States 0%0 of 279
  62. =2751Casa GrandeArizona, United States 0%0 of 251
  63. =2751Paysonlast full day 11 OctArizona, United States 0%0 of 262
  64. =2751LivermoreCalifornia, United States 0%0 of 258
  65. =2751OremUtah, United States 0%0 of 284
  66. =2751HitachiomiyaIbaraki, Japan 0%0 of 279
  67. =2751KōkaShiga, Japan 0%0 of 265
  68. =2751Aizu-WakamatsuFukushima, Japan 0%0 of 271
  69. =2751SodegauraChiba, Japan 0%0 of 281
  70. =2770LaaksolahtiUusimaa, Finland 0%0 of 286
  71. =2770HitachiIbaraki, Japan 0%0 of 271
  72. =2770HanamakiIwate, Japan 0%0 of 274
  73. =2770SapporoHokkaido, Japan 0%0 of 282
  74. =2770KitamiHokkaido, Japan 0%0 of 275
  75. =2770WollongongNew South Wales, Australia 0%0 of 280
  76. =2770YorkEngland, United Kingdom 0%0 of 262
  77. =2770FarnboroughEngland, United Kingdom 0%0 of 276
  78. =2770Burton upon TrentEngland, United Kingdom 0%0 of 271
  79. =2770TrochtelfingenBaden-Wurttemberg, Germany 0%0 of 280
  80. =2770PortlaoiseLeinster, Ireland 0%0 of 285
  81. =2770ToursCentre-Val de Loire, France 0%0 of 286
  82. =2770BesançonBourgogne-Franche-Comté, France 0%0 of 253
  83. =2770AuriolProvence-Alpes-Côte d'Azur, France 0%0 of 282
  84. =2770AvellinoCampania, Italy 0%0 of 261
  85. =2770Highland HeightsKentucky, United States 0%0 of 281
  86. =2770ArnoldMissouri, United States 0%0 of 277
  87. =2770DentOhio, United States 0%0 of 277
  88. =2770Ben LomondCalifornia, United States 0%0 of 268
  89. =2770BrawleyCalifornia, United States 0%0 of 238
  90. =2770El CentroCalifornia, United States 0%0 of 280
  91. =2770ThorntonColorado, United States 0%0 of 278
  92. =2770RenoNevada, United States 0%0 of 286
  93. =2770SmithfieldUtah, United States 0%0 of 286
  94. =2770BrossardQuebec, Canada 0%0 of 275
  95. =2770MontréalQuebec, Canada 0%0 of 286
  96. =2770Port AlberniBritish Columbia, Canada 0%0 of 229
  97. =2770SaskatoonSaskatchewan, Canada 0%0 of 276
  98. =2798OmigawaChiba, Japan 0%0 of 274
  99. =2798Tōmalast full day 4 OctHokkaido, Japan 0%0 of 263
  100. =2798SydneyNew South Wales, Australia 0%0 of 286

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).