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. =1381BreukelenUtrecht, The Netherlands 0%0 of 30
  2. =1381StabroekFlanders, Belgium 0%0 of 30
  3. =1381KortrijkFlanders, Belgium 0%0 of 30
  4. =1381Westerlandlast full day 10 OctSchleswig-Holstein, Germany 0%0 of 27
  5. =1381Osnabrücklast full day 10 OctLower Saxony, Germany 0%0 of 27
  6. =1381Norderneylast full day 10 OctLower Saxony, Germany 0%0 of 27
  7. =1381NauenBrandenburg, Germany 0%0 of 30
  8. =1381Mühlhausenlast full day 10 OctThuringia, Germany 0%0 of 27
  9. =1381Halle (Saale)last full day 10 OctSaxony-Anhalt, Germany 0%0 of 27
  10. =1381Bitterfeld-Wolfenlast full day 10 OctSaxony-Anhalt, Germany 0%0 of 27
  11. =1381Zielona GóraLubusz, Poland 0%0 of 28
  12. =1381ValladolidCastille and León, Spain 0%0 of 26
  13. =1381Donostia / San SebastiánBasque Country, Spain 0%0 of 30
  14. =1381Novo MestoUrban Municipality of Novo Mesto, Slovenia 0%0 of 30
  15. =1381Lake CityFlorida, United States 0%0 of 28
  16. =1381HaysvilleKansas, United States 0%0 of 30
  17. =1381JacksonMississippi, United States 0%0 of 30
  18. =1381CincinnatiOhio, United States 0%0 of 30
  19. =1381ColumbusOhio, United States 0%0 of 30
  20. =1381AustinTexas, United States 0%0 of 30
  21. =1381Franklin ParkIllinois, United States 0%0 of 30
  22. =1381ToledoOhio, United States 0%0 of 30
  23. =1381GaltCalifornia, United States 0%0 of 22
  24. =1381KosaiShizuoka, Japan 0%0 of 30
  25. =1381Candler-McAfeeGeorgia, United States 0%0 of 29
  26. =1381NankokuKochi, Japan 0%0 of 30
  27. =1381AsakuchiOkayama, Japan 0%0 of 30
  28. =1428KaunasKaunas, Lithuania 0%0 of 27
  29. =1428Bueng KanBueng Kan, Thailand 0%0 of 30
  30. =1428GaigeturiJeju-do, South Korea 0%0 of 29
  31. =1428ShidoKagawa, Japan 0%0 of 30
  32. =1428SaikiOita, Japan 0%0 of 30
  33. =1428OsakaOsaka, Japan 0%0 of 30
  34. =1428Narutochō-mitsuishiTokushima, Japan 0%0 of 30
  35. =1428KukichūōSaitama, Japan 0%0 of 30
  36. =1428IzumisanoOsaka, Japan 0%0 of 30
  37. =1428IizukaFukuoka, Japan 0%0 of 30
  38. =1428IchinomiyaAichi, Japan 0%0 of 30
  39. =1428SagaeYamagata, Japan 0%0 of 29
  40. =1428NakaIbaraki, Japan 0%0 of 30
  41. =1428NagaiYamagata, Japan 0%0 of 30
  42. =1428Lorcalast full day 11 OctMurcia, Spain 0%0 of 28
  43. =1428SwanseaWales, United Kingdom 0%0 of 30
  44. =1428's-GravenzandeSouth Holland, The Netherlands 0%0 of 29
  45. =1428LopikUtrecht, The Netherlands 0%0 of 29
  46. =1428AmsterdamNorth Holland, The Netherlands 0%0 of 29
  47. =1428Stralsundlast full day 10 OctMecklenburg-Vorpommern, Germany 0%0 of 27
  48. =1428SchwerinMecklenburg-Vorpommern, Germany 0%0 of 30
  49. =1428Mönchengladbachlast full day 10 OctNorth Rhine-Westphalia, Germany 0%0 of 26
  50. =1428KasselHesse, Germany 0%0 of 26
  51. =1428Borkenlast full day 10 OctNorth Rhine-Westphalia, Germany 0%0 of 26
  52. =1428ThionvilleGrand Est, France 0%0 of 28
  53. =1428ContesProvence-Alpes-Côte d'Azur, France 0%0 of 30
  54. =1428BayonneNew Aquitaine, France 0%0 of 30
  55. =1428Žiar nad HronomBanská Bystrica Region, Slovakia 0%0 of 30
  56. =1428SenicaTrnava Region, Slovakia 0%0 of 30
  57. =1428RokycanyPlzeň Region, Czechia 0%0 of 30
  58. =1428Cosladalast full day 9 OctMadrid, Spain 0%0 of 22
  59. =1428PollaCampania, Italy 0%0 of 29
  60. =1428Zagorje ob SaviMunicipality of Zagorje ob Savi, Slovenia 0%0 of 30
  61. =1428PtujUrban Municipality of Ptuj, Slovenia 0%0 of 30
  62. =1428Les AbymesGuadeloupe, Guadeloupe 0%0 of 21
  63. =1428GarcíaNuevo León, Mexico 0%0 of 24
  64. =1428DecaturAlabama, United States 0%0 of 29
  65. =1428Baton RougeLouisiana, United States 0%0 of 29
  66. =1428WheelersburgOhio, United States 0%0 of 30
  67. =1428SpartanburgSouth Carolina, United States 0%0 of 30
  68. =1428CorsicanaTexas, United States 0%0 of 30
  69. =1428Missouri CityTexas, United States 0%0 of 30
  70. =1428Elmwood ParkIllinois, United States 0%0 of 29
  71. =1428Alta SierraCalifornia, United States 0%0 of 30
  72. =1428CalexicoCalifornia, United States 0%0 of 28
  73. =1428HuronCalifornia, United States 0%0 of 30
  74. =1428VallejoCalifornia, United States 0%0 of 28
  75. =1428ChilliwackBritish Columbia, Canada 0%0 of 30
  76. =1428Kawachi-NaganoOsaka, Japan 0%0 of 30
  77. =1428AmamiKagoshima, Japan 0%0 of 30
  78. =1428IgaMie, Japan 0%0 of 30
  79. =1428OgōriFukuoka, Japan 0%0 of 30
  80. =1428YoshinogawaTokushima, Japan 0%0 of 30
  81. =1481VolosThessaly, Greece 0%0 of 28
  82. =1481HengchunTaiwan, Taiwan 0%0 of 30
  83. =1481ZentsujichóKagawa, Japan 0%0 of 30
  84. =1481SōjaOkayama, Japan 0%0 of 30
  85. =1481ŌtaGunma, Japan 0%0 of 30
  86. =1481NodaChiba, Japan 0%0 of 27
  87. =1481NabariMie, Japan 0%0 of 30
  88. =1481KōnosuSaitama, Japan 0%0 of 30
  89. =1481KogaFukuoka, Japan 0%0 of 30
  90. =1481KiryūGunma, Japan 0%0 of 30
  91. =1481KawaguchiSaitama, Japan 0%0 of 30
  92. =1481IgusaSaitama, Japan 0%0 of 30
  93. =1481HijiOita, Japan 0%0 of 30
  94. =1481AgeoSaitama, Japan 0%0 of 30
  95. =1481KimitsuChiba, Japan 0%0 of 30
  96. =1481GoshogawaraAomori, Japan 0%0 of 27
  97. =1481SpijkenisseSouth Holland, The Netherlands 0%0 of 29
  98. =1481VoitsbergStyria, Austria 0%0 of 30
  99. =1481MödlingLower Austria, Austria 0%0 of 30
  100. =1481EisenstadtBurgenland, Austria 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).