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. 1601Ashton-under-Lynelast full day 11 OctEngland, United Kingdom 0%1 of 252
  2. 1602SheridanWyoming, United States 0%1 of 253
  3. 1603AntofagastaAntofagasta, Chile 0%1 of 254
  4. 1604SeogwipoJeju-do, South Korea 0%1 of 254
  5. 1605HasseltFlanders, Belgium 0%1 of 254
  6. 1606BastogneWallonia, Belgium 0%1 of 254
  7. 1607GaigeturiJeju-do, South Korea 0%1 of 255
  8. 1608HelotesTexas, United States 0%1 of 255
  9. 1609MadridMadrid, Spain 0%1 of 255
  10. 1610Prince GeorgeBritish Columbia, Canada 0%1 of 255
  11. 1611North PortlandOregon, United States 0%1 of 256
  12. 1612PattaniPattani, Thailand 0%1 of 257
  13. 1613Cubatãolast full day 4 OctSão Paulo, Brazil 0%1 of 258
  14. 1614Höhr-Grenzhausenlast full day 10 OctRheinland-Pfalz, Germany 0%1 of 258
  15. 1615KhalándrionAttica, Greece 0%1 of 260
  16. 1616SidonSouth Governorate, Lebanon 0%1 of 261
  17. =1617TonoshōKagawa, Japan 0%1 of 262
  18. =1617CotaCundinamarca, Colombia 0%1 of 262
  19. 1619BournemouthEngland, United Kingdom 0%1 of 262
  20. 1620ChristchurchEngland, United Kingdom 0%1 of 262
  21. 1621OxfordEngland, United Kingdom 0%1 of 262
  22. 1622Apache JunctionArizona, United States 0%1 of 262
  23. 1623Lake CityFlorida, United States 0%1 of 263
  24. 1624New AlbanyOhio, United States 0%1 of 263
  25. 1625OlivetCentre-Val de Loire, France 0%1 of 263
  26. 1626McAlesterOklahoma, United States 0%1 of 264
  27. 1627JaénAndalusia, Spain 0%1 of 264
  28. 1628LincolnNebraska, United States 0%1 of 264
  29. 1629Knittelfeldlast full day 24 SeptStyria, Austria 0%1 of 265
  30. 1630MooreOklahoma, United States 0%1 of 265
  31. 1631LohjaUusimaa, Finland 0%1 of 265
  32. 1632Missouri CityTexas, United States 0%1 of 266
  33. 1633MaitlandNew South Wales, Australia 0%1 of 266
  34. 1634ScottsbluffNebraska, United States 0%1 of 266
  35. 1635RoveretoTrentino-Alto Adige, Italy 0%1 of 267
  36. 1636Ōyanomachi-noboritateKumamoto, Japan 0%1 of 267
  37. 1637HopewellVirginia, United States 0%1 of 267
  38. 1638MagongTaiwan, Taiwan 0%1 of 268
  39. 1639Pompano BeachFlorida, United States 0%1 of 268
  40. 1640NaplesCampania, Italy 0%1 of 269
  41. 1641Kempten (Allgäu)last full day 10 OctBavaria, Germany 0%1 of 269
  42. =1642MulhouseGrand Est, France 0%1 of 270
  43. =1642Warner RobinsGeorgia, United States 0%1 of 270
  44. =1644Saint-MaloBrittany, France 0%1 of 270
  45. =1644Banská BystricaBanská Bystrica Region, Slovakia 0%1 of 270
  46. 1646AlburyNew South Wales, Australia 0%1 of 270
  47. 1647BertrixWallonia, Belgium 0%1 of 270
  48. 1648CodyWyoming, United States 0%1 of 270
  49. 1649NewportWales, United Kingdom 0%1 of 271
  50. 1650Camp Verdelast full day 11 OctArizona, United States 0%1 of 271
  51. 1651VielsalmWallonia, Belgium 0%1 of 271
  52. 1652Uekimachi-mōnoKumamoto, Japan 0%1 of 272
  53. 1653SebastopolCalifornia, United States 0%1 of 272
  54. 1654TomiokaKumamoto, Japan 0%1 of 273
  55. 1655UtoKumamoto, Japan 0%1 of 273
  56. 1656MinamataKumamoto, Japan 0%1 of 273
  57. 1657Flensburglast full day 10 OctSchleswig-Holstein, Germany 0%1 of 273
  58. 1658PanazolNew Aquitaine, France 0%1 of 273
  59. 1659AnsWallonia, Belgium 0%1 of 273
  60. 1660EupenWallonia, Belgium 0%1 of 273
  61. 1661Shin’ichiHiroshima, Japan 0%1 of 274
  62. 1662Cernicalast full day 10 OctIlfov, Romania 0%1 of 274
  63. 1663AomoriAomori, Japan 0%1 of 274
  64. 1664NottinghamEngland, United Kingdom 0%1 of 274
  65. 1665PortsmouthEngland, United Kingdom 0%1 of 274
  66. =1666Milton KeynesEngland, United Kingdom 0%1 of 274
  67. =1666Market DeepingEngland, United Kingdom 0%1 of 274
  68. 1668RevinGrand Est, France 0%1 of 274
  69. 1669BlackburnEngland, United Kingdom 0%1 of 274
  70. 1670SevillaAndalusia, Spain 0%1 of 275
  71. 1671ShreveportLouisiana, United States 0%1 of 275
  72. 1672Lindaulast full day 10 OctBavaria, Germany 0%1 of 275
  73. 1673Neustadt an der Donaulast full day 10 OctBavaria, Germany 0%1 of 275
  74. 1674KagoshimaKagoshima, Japan 0%1 of 275
  75. 1675MinamikyushuKagoshima, Japan 0%1 of 275
  76. 1676MuswellbrookNew South Wales, Australia 0%1 of 275
  77. 1677Matsuelast full day 11 OctShimane, Japan 0%1 of 275
  78. 1678PittsfieldMassachusetts, United States 0%1 of 275
  79. 1679ZhushanTaiwan, Taiwan 0%1 of 276
  80. 1680MonterreyNuevo León, Mexico 0%1 of 276
  81. 1681ShulinTaipei, Taiwan 0%1 of 276
  82. 1682DaxiTaiwan, Taiwan 0%1 of 276
  83. 1683BeppuOita, Japan 0%1 of 276
  84. 1684WorthingEngland, United Kingdom 0%1 of 276
  85. 1685SanoTochigi, Japan 0%1 of 276
  86. 1686Venice Gardenslast full day 11 OctFlorida, United States 0%1 of 276
  87. 1687BlackpoolEngland, United Kingdom 0%1 of 276
  88. =1688New LambtonNew South Wales, Australia 0%1 of 276
  89. =1688DavieFlorida, United States 0%1 of 276
  90. 1690WorlandWyoming, United States 0%1 of 276
  91. 1691ImabariEhime, Japan 0%1 of 277
  92. 1692SeirōNiigata, Japan 0%1 of 277
  93. 1693Kiellast full day 10 OctSchleswig-Holstein, Germany 0%1 of 277
  94. 1694HobbsNew Mexico, United States 0%1 of 277
  95. 1695Coconut CreekFlorida, United States 0%1 of 277
  96. 1696WareMassachusetts, United States 0%1 of 277
  97. 1697XinyingTaiwan, Taiwan 0%1 of 278
  98. 1698LunévilleGrand Est, France 0%1 of 278
  99. 1699DecaturAlabama, United States 0%1 of 278
  100. 1700Barra da TijucaRio de Janeiro, Brazil 0%1 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).