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. =2495ŌmihachimanShiga, Japan 0%0 of 276
  2. =2495YachimataChiba, Japan 0%0 of 278
  3. =2495TorideIbaraki, Japan 0%0 of 281
  4. =2495MookaTochigi, Japan 0%0 of 274
  5. =2495KesennumaMiyagi, Japan 0%0 of 282
  6. =2495TraralgonVictoria, Australia 0%0 of 211
  7. =2495SaguntoValencia, Spain 0%0 of 235
  8. =2495DoncasterEngland, United Kingdom 0%0 of 271
  9. =2495SarriaGalicia, Spain 0%0 of 218
  10. =2495Cangas del Narcealast full day 11 OctAsturias, Spain 0%0 of 271
  11. =2495ColumbiaMissouri, United States 0%0 of 286
  12. =2495GulfportMississippi, United States 0%0 of 285
  13. =2495WavelandMississippi, United States 0%0 of 283
  14. =2495LawtonOklahoma, United States 0%0 of 259
  15. =2495SeabrookTexas, United States 0%0 of 267
  16. =2495OaklandCalifornia, United States 0%0 of 276
  17. =2495WoodlandCalifornia, United States 0%0 of 202
  18. =2495Yuba CityCalifornia, United States 0%0 of 273
  19. =2495AsoKumamoto, Japan 0%0 of 267
  20. =2495KikugawaShizuoka, Japan 0%0 of 280
  21. =2495MotosuGifu, Japan 0%0 of 235
  22. =2495SayamaOsaka, Japan 0%0 of 272
  23. =2495BarakiChiba, Japan 0%0 of 268
  24. =2495Minami-AlpsYamanashi, Japan 0%0 of 277
  25. =2495IkiNagasaki, Japan 0%0 of 275
  26. =2495SaikaiNagasaki, Japan 0%0 of 278
  27. =2495KaminomaAichi, Japan 0%0 of 278
  28. =2528TsurugaFukui, Japan 0%0 of 274
  29. =2528TochigiTochigi, Japan 0%0 of 216
  30. =2528ShizuokaShizuoka, Japan 0%0 of 276
  31. =2528ŌtsukiYamanashi, Japan 0%0 of 267
  32. =2528NiigataNiigata, Japan 0%0 of 281
  33. =2528NakanojōGunma, Japan 0%0 of 269
  34. =2528NaganoNagano, Japan 0%0 of 282
  35. =2528KisarazuChiba, Japan 0%0 of 281
  36. =2528KakegawaShizuoka, Japan 0%0 of 282
  37. =2528IidaNagano, Japan 0%0 of 281
  38. =2528Hamadalast full day 11 OctShimane, Japan 0%0 of 276
  39. =2528AtamiShizuoka, Japan 0%0 of 282
  40. =2528Newcastle upon TyneEngland, United Kingdom 0%0 of 210
  41. =2528HerrenbergBaden-Wurttemberg, Germany 0%0 of 251
  42. =2528Villefranche-sur-SaôneAuvergne-Rhône-Alpes, France 0%0 of 271
  43. =2528ValenceAuvergne-Rhône-Alpes, France 0%0 of 286
  44. =2528SorbiersAuvergne-Rhône-Alpes, France 0%0 of 282
  45. =2528LillehammerInnlandet, Norway 0%0 of 229
  46. =2528SchrieverLouisiana, United States 0%0 of 266
  47. =2528GreensboroNorth Carolina, United States 0%0 of 281
  48. =2528HickoryNorth Carolina, United States 0%0 of 273
  49. =2528RaleighNorth Carolina, United States 0%0 of 285
  50. =2528MaryvilleTennessee, United States 0%0 of 278
  51. =2528Cedar ParkTexas, United States 0%0 of 275
  52. =2528PortlandMaine, United States 0%0 of 286
  53. =2528MankatoMinnesota, United States 0%0 of 286
  54. =2528VictorvilleCalifornia, United States 0%0 of 221
  55. =2528CeutaCeuta, Spain 0%0 of 242
  56. =2528ŌsakiMiyagi, Japan 0%0 of 272
  57. =2528SusonoShizuoka, Japan 0%0 of 277
  58. =2528NankokuKochi, Japan 0%0 of 271
  59. =2528NarashinoChiba, Japan 0%0 of 279
  60. =2528KyōtangoKyoto, Japan 0%0 of 274
  61. =2561NumataGunma, Japan 0%0 of 271
  62. =2561NiimiOkayama, Japan 0%0 of 273
  63. =2561KumagawaFukui, Japan 0%0 of 280
  64. =2561KanazawaIshikawa, Japan 0%0 of 282
  65. =2561HamamatsuShizuoka, Japan 0%0 of 281
  66. =2561FujinomiyaShizuoka, Japan 0%0 of 258
  67. =2561MiuraKanagawa, Japan 0%0 of 270
  68. =2561UwajimaEhime, Japan 0%0 of 282
  69. =2561YamagataYamagata, Japan 0%0 of 280
  70. =2561NaritaChiba, Japan 0%0 of 281
  71. =2561MitoIbaraki, Japan 0%0 of 271
  72. =2561Matsushimalast full day 29 SeptMiyagi, Japan 0%0 of 268
  73. =2561KōriyamaFukushima, Japan 0%0 of 282
  74. =2561KasamaIbaraki, Japan 0%0 of 271
  75. =2561LisbonLisbon, Portugal 0%0 of 285
  76. =2561Meiningenlast full day 10 OctThuringia, Germany 0%0 of 282
  77. =2561WaterfordMunster, Ireland 0%0 of 285
  78. =2561PerpignanOccitanie, France 0%0 of 286
  79. =2561Donostia / San SebastiánBasque Country, Spain 0%0 of 286
  80. =2561MiamiFlorida, United States 0%0 of 276
  81. =2561JeffersontownKentucky, United States 0%0 of 281
  82. =2561SpringfieldMissouri, United States 0%0 of 279
  83. =2561Greenvillelast full day 2 OctNorth Carolina, United States 0%0 of 266
  84. =2561MuscatineIowa, United States 0%0 of 277
  85. =2561Hitachi-NakaIbaraki, Japan 0%0 of 274
  86. =2561EbinaKanagawa, Japan 0%0 of 269
  87. =2561AkishimaTokyo, Japan 0%0 of 271
  88. =2561Minami-SōmaFukushima, Japan 0%0 of 276
  89. =2561SōsaChiba, Japan 0%0 of 276
  90. =2561InzaiChiba, Japan 0%0 of 275
  91. =2591GrevenáWest Macedonia, Greece 0%0 of 269
  92. =2591ShironeNiigata, Japan 0%0 of 270
  93. =2591ShimadaShizuoka, Japan 0%0 of 281
  94. =2591IshiokaIbaraki, Japan 0%0 of 278
  95. =2591PayerneVaud, Switzerland 0%0 of 280
  96. =2591Villingen-SchwenningenBaden-Wurttemberg, Germany 0%0 of 282
  97. =2591Suhllast full day 10 OctThuringia, Germany 0%0 of 282
  98. =2591GärtringenBaden-Wurttemberg, Germany 0%0 of 280
  99. =2591VesoulBourgogne-Franche-Comté, France 0%0 of 217
  100. =2591ÉpinalGrand Est, France 0%0 of 256

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).