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. =1501FürthHesse, Germany 1%2 of 283
  2. =1501SavoyIllinois, United States 1%2 of 283
  3. =1501Saint MichaelMinnesota, United States 1%2 of 283
  4. 1504ZierenbergHesse, Germany 1%2 of 283
  5. 1505RixensartWallonia, Belgium 1%2 of 283
  6. 1506MiddletownOhio, United States 1%2 of 284
  7. 1507SpringfieldOhio, United States 1%2 of 284
  8. 1508Marburg an der LahnHesse, Germany 1%2 of 284
  9. 1509GrevenmacherGrevenmacher, Luxembourg 1%2 of 284
  10. 1510EdertalHesse, Germany 1%2 of 284
  11. 1511ArvadaColorado, United States 1%2 of 284
  12. 1512RidgefieldWashington, United States 1%2 of 284
  13. 1513MuncieIndiana, United States 1%2 of 285
  14. 1514AndersonIndiana, United States 1%2 of 285
  15. 1515PainesvilleOhio, United States 1%2 of 285
  16. =1516BrusselsBrussels Capital, Belgium 1%2 of 285
  17. =1516WaterburyConnecticut, United States 1%2 of 285
  18. 1518EdsonAlberta, Canada 1%2 of 285
  19. 1519PriceUtah, United States 1%2 of 285
  20. 1520El PasoTexas, United States 1%2 of 286
  21. 1521EnnsUpper Austria, Austria 1%2 of 286
  22. 1522TraunUpper Austria, Austria 1%2 of 286
  23. 1523WelsUpper Austria, Austria 1%2 of 286
  24. 1524IndianapolisIndiana, United States 1%2 of 286
  25. 1525ParisÎle-de-France, France 1%2 of 286
  26. 1526HaysvilleKansas, United States 1%2 of 286
  27. 1527LyonAuvergne-Rhône-Alpes, France 1%2 of 286
  28. 1528KapellenFlanders, Belgium 1%2 of 286
  29. =1529KortrijkFlanders, Belgium 1%2 of 286
  30. =1529CrollesAuvergne-Rhône-Alpes, France 1%2 of 286
  31. =1531DecaturIllinois, United States 1%2 of 286
  32. =1531BloomingtonIndiana, United States 1%2 of 286
  33. 1533ManchesterEngland, United Kingdom 1%2 of 286
  34. =1534MolFlanders, Belgium 1%2 of 286
  35. =1534RennesBrittany, France 1%2 of 286
  36. =1534OrléansCentre-Val de Loire, France 1%2 of 286
  37. 1537CherbourgNormandy, France 1%2 of 286
  38. =1538NewcastleNew South Wales, Australia 1%2 of 286
  39. =1538ZaventemFlanders, Belgium 1%2 of 286
  40. =1538Rose HillVirginia, United States 1%2 of 286
  41. =1538MolineIllinois, United States 1%2 of 286
  42. 1542AarschotFlanders, Belgium 1%2 of 286
  43. 1543Des MoinesIowa, United States 1%2 of 286
  44. 1544HartfordConnecticut, United States 1%2 of 286
  45. 1545BloomingtonIllinois, United States 1%2 of 286
  46. 1546MedfordOregon, United States 1%2 of 286
  47. 1547Detroit LakesMinnesota, United States 1%2 of 286
  48. 1548AuburnWashington, United States 1%2 of 286
  49. 1549MontluçonAuvergne-Rhône-Alpes, France 1%2 of 286
  50. 1550New LondonConnecticut, United States 1%2 of 286
  51. 1551FontainebleauÎle-de-France, France 1%2 of 286
  52. =1552CharleroiWallonia, Belgium 1%2 of 286
  53. =1552AbbotsfordBritish Columbia, Canada 1%2 of 286
  54. 1554SalemOregon, United States 1%2 of 286
  55. 1555AshlandOregon, United States 1%2 of 286
  56. 1556CoquitlamBritish Columbia, Canada 1%2 of 286
  57. 1557PortlandOregon, United States 1%2 of 286
  58. 1558CoquimboCoquimbo Region, Chile 0%1 of 202
  59. 1559AndoverEngland, United Kingdom 0%1 of 206
  60. 1560StawellVictoria, Australia 0%1 of 207
  61. 1561HayesEngland, United Kingdom 0%1 of 208
  62. 1562Cheadle HulmeEngland, United Kingdom 0%1 of 209
  63. 1563ElverumInnlandet, Norway 0%1 of 212
  64. 1564LeedsEngland, United Kingdom 0%1 of 213
  65. =1565WiganEngland, United Kingdom 0%1 of 213
  66. =1565SheringhamEngland, United Kingdom 0%1 of 213
  67. 1567LutonEngland, United Kingdom 0%1 of 213
  68. 1568KuryeJeollanam-do, South Korea 0%1 of 214
  69. 1569PlymouthEngland, United Kingdom 0%1 of 214
  70. 1570SouthamptonEngland, United Kingdom 0%1 of 214
  71. 1571Port MacquarieNew South Wales, Australia 0%1 of 214
  72. 1572Laem ChabangChon Buri, Thailand 0%1 of 215
  73. 1573LiverpoolEngland, United Kingdom 0%1 of 215
  74. 1574ChanthaburiChanthaburi, Thailand 0%1 of 216
  75. 1575VratsaVratsa, Bulgaria 0%1 of 220
  76. 1576PorsgrunnTelemark, Norway 0%1 of 222
  77. 1577BendorfRheinland-Pfalz, Germany 0%1 of 223
  78. 1578Celayalast full day 11 OctGuanajuato, Mexico 0%1 of 226
  79. 1579AnchorageAlaska, United States 0%1 of 227
  80. 1580Alcantarillalast full day 11 OctMurcia, Spain 0%1 of 229
  81. 1581EldaValencia, Spain 0%1 of 229
  82. 1582San Miguel de Allendelast full day 11 OctGuanajuato, Mexico 0%1 of 232
  83. 1583El Planlast full day 11 OctMurcia, Spain 0%1 of 233
  84. 1584Cartagenalast full day 11 OctMurcia, Spain 0%1 of 233
  85. 1585NesttunVestland, Norway 0%1 of 234
  86. 1586CuernavacaMorelos, Mexico 0%1 of 235
  87. 1587HandlováTrenčín Region, Slovakia 0%1 of 235
  88. 1588Thornaby-on-TeesEngland, United Kingdom 0%1 of 235
  89. 1589Prado del ReyAndalusia, Spain 0%1 of 237
  90. 1590Mission BendTexas, United States 0%1 of 237
  91. 1591Forest GroveOregon, United States 0%1 of 238
  92. 1592Betonglast full day 11 OctYala, Thailand 0%1 of 239
  93. 1593VigoGalicia, Spain 0%1 of 242
  94. 1594WindcrestTexas, United States 0%1 of 244
  95. 1595Fort SmithArkansas, United States 0%1 of 246
  96. 1596SingletonNew South Wales, Australia 0%1 of 247
  97. 1597Toyamalast full day 22 SeptToyama, Japan 0%1 of 248
  98. 1598Nyūzenlast full day 22 SeptToyama, Japan 0%1 of 251
  99. 1599LafayetteIndiana, United States 0%1 of 251
  100. 1600TsuchiuraIbaraki, Japan 0%1 of 252

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).