SmogRank / Rankings

All 3,290 cities by unhealthy days, last 30 days

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. =2664HitachiomiyaIbaraki, Japan 0%0 of 30
  2. =2664KōkaShiga, Japan 0%0 of 30
  3. =2664Fort BlissTexas, United States 0%0 of 29
  4. =2704OkayaNagano, Japan 0%0 of 30
  5. =2704ŌgakiGifu, Japan 0%0 of 30
  6. =2704MakiNiigata, Japan 0%0 of 29
  7. =2704KogaIbaraki, Japan 0%0 of 30
  8. =2704ImaichiTochigi, Japan 0%0 of 30
  9. =2704CairnsQueensland, Australia 0%0 of 30
  10. =2704StreetEngland, United Kingdom 0%0 of 30
  11. =2704ImminghamEngland, United Kingdom 0%0 of 30
  12. =2704GlasgowScotland, United Kingdom 0%0 of 30
  13. =2704FarnboroughEngland, United Kingdom 0%0 of 30
  14. =2704BlackburnEngland, United Kingdom 0%0 of 30
  15. =2704BirminghamEngland, United Kingdom 0%0 of 30
  16. =2704MonsWallonia, Belgium 0%0 of 30
  17. =2704Neuhaus am Rennweglast full day 10 OctThuringia, Germany 0%0 of 27
  18. =2704Duderstadtlast full day 10 OctLower Saxony, Germany 0%0 of 27
  19. =2704NavanLeinster, Ireland 0%0 of 30
  20. =2704LongfordLeinster, Ireland 0%0 of 30
  21. =2704DundalkLeinster, Ireland 0%0 of 30
  22. =2704DroghedaLeinster, Ireland 0%0 of 30
  23. =2704VichyAuvergne-Rhône-Alpes, France 0%0 of 30
  24. =2704ToursCentre-Val de Loire, France 0%0 of 30
  25. =2704ÉpinalGrand Est, France 0%0 of 30
  26. =2704ChâteaurouxCentre-Val de Loire, France 0%0 of 30
  27. =2704BastiaCorsica, France 0%0 of 30
  28. =2704les EscaldesEscaldes-Engordany, Andorra 0%0 of 30
  29. =2704SoriaCastille and León, Spain 0%0 of 26
  30. =2704Delray BeachFlorida, United States 0%0 of 30
  31. =2704Oak RidgeFlorida, United States 0%0 of 30
  32. =2704BrandermillVirginia, United States 0%0 of 30
  33. =2704RoanokeVirginia, United States 0%0 of 30
  34. =2704SpringfieldVirginia, United States 0%0 of 30
  35. =2704Des MoinesIowa, United States 0%0 of 30
  36. =2704Presque IsleMaine, United States 0%0 of 30
  37. =2704Apple ValleyMinnesota, United States 0%0 of 30
  38. =2704TrentonNew Jersey, United States 0%0 of 30
  39. =2704MonessenPennsylvania, United States 0%0 of 30
  40. =2704TempeArizona, United States 0%0 of 30
  41. =2704TucsonArizona, United States 0%0 of 30
  42. =2704LancasterCalifornia, United States 0%0 of 30
  43. =2704AlbanyOregon, United States 0%0 of 30
  44. =2704AshlandOregon, United States 0%0 of 30
  45. =2704MedfordOregon, United States 0%0 of 30
  46. =2704WoodburnOregon, United States 0%0 of 28
  47. =2704HerrimanUtah, United States 0%0 of 30
  48. =2704Port AngelesWashington, United States 0%0 of 30
  49. =2704EdsonAlberta, Canada 0%0 of 30
  50. =2704HamiltonOntario, Canada 0%0 of 30
  51. =2704NanaimoBritish Columbia, Canada 0%0 of 29
  52. =2704North VancouverBritish Columbia, Canada 0%0 of 30
  53. =2704Saint-Jean-sur-RichelieuQuebec, Canada 0%0 of 29
  54. =2704St. AlbertAlberta, Canada 0%0 of 30
  55. =2704TorontoOntario, Canada 0%0 of 30
  56. =2704MinamiashigaraKanagawa, Japan 0%0 of 30
  57. =2704Four CornersFlorida, United States 0%0 of 30
  58. =2704TomeMiyagi, Japan 0%0 of 30
  59. =2759ŌtsukiYamanashi, Japan 0%0 of 30
  60. =2759AnamizuIshikawa, Japan 0%0 of 30
  61. =2759WakuyaMiyagi, Japan 0%0 of 28
  62. =2759HitachiIbaraki, Japan 0%0 of 28
  63. =2759TomakomaiHokkaido, Japan 0%0 of 30
  64. =2759YorkEngland, United Kingdom 0%0 of 30
  65. =2759MansfieldEngland, United Kingdom 0%0 of 30
  66. =2759HartlepoolEngland, United Kingdom 0%0 of 26
  67. =2759GreenockScotland, United Kingdom 0%0 of 29
  68. =2759TournaiWallonia, Belgium 0%0 of 30
  69. =2759Kirchzartenlast full day 9 OctBaden-Wurttemberg, Germany 0%0 of 25
  70. =2759Höhr-Grenzhausenlast full day 10 OctRheinland-Pfalz, Germany 0%0 of 27
  71. =2759HerrenbergBaden-Wurttemberg, Germany 0%0 of 21
  72. =2759DublinLeinster, Ireland 0%0 of 30
  73. =2759RoussillonAuvergne-Rhône-Alpes, France 0%0 of 25
  74. =2759La Ferté-MacéNormandy, France 0%0 of 30
  75. =2759Baume-les-DamesBourgogne-Franche-Comté, France 0%0 of 27
  76. =2759AngersPays de la Loire, France 0%0 of 30
  77. =2759OrlandoFlorida, United States 0%0 of 30
  78. =2759TampaFlorida, United States 0%0 of 29
  79. =2759Short PumpVirginia, United States 0%0 of 29
  80. =2759New BaltimoreMichigan, United States 0%0 of 30
  81. =2759SouthfieldMichigan, United States 0%0 of 30
  82. =2759New York Citylast full day 11 OctNew York, United States 0%0 of 28
  83. =2759BridgevillePennsylvania, United States 0%0 of 30
  84. =2759HollisterCalifornia, United States 0%0 of 28
  85. =2759IndioCalifornia, United States 0%0 of 30
  86. =2759YrekaCalifornia, United States 0%0 of 30
  87. =2759ScottsbluffNebraska, United States 0%0 of 28
  88. =2759AltamontOregon, United States 0%0 of 26
  89. =2759CanbyOregon, United States 0%0 of 30
  90. =2759HermistonOregon, United States 0%0 of 30
  91. =2759RooseveltUtah, United States 0%0 of 30
  92. =2759LyndenWashington, United States 0%0 of 30
  93. =2759Union GapWashington, United States 0%0 of 30
  94. =2759BarrieOntario, Canada 0%0 of 29
  95. =2759KitchenerOntario, Canada 0%0 of 29
  96. =2759Medicine HatAlberta, Canada 0%0 of 30
  97. =2759BathurstNew Brunswick, Canada 0%0 of 28
  98. =2798HaskovoHaskovo, Bulgaria 0%0 of 30
  99. =2798Matsuelast full day 11 OctShimane, Japan 0%0 of 28
  100. =2798HakodateHokkaido, Japan 0%0 of 30

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), last 30 days 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 21 or more of the 30 days. Monitor data from national networks via OpenAQ and the publishers listed at smogrank.com/sources. smogrank.com/rankings?w=30d&by=days. Ranked on low-cost sensors, with no reference monitor in the city: #1 Peshawar, #2 Multan, #5 Kasur, #7 Gujranwala, #8 Lahore, #9 Faisalabad and #10 Jammu. Some values from Sensor.Community, ODbL. Some readings from Vietnam's government monitors; Department of Environment, Nepal; Aurassure; RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver); 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: Vietnam's government monitors; Department of Environment, Nepal; Aurassure; RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver); Umhverfisstofnun (Environment Agency of Iceland), no reuse terms published (why we use them).