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. =2000TokonameAichi, Japan 0%0 of 255
  2. =2000TokiGifu, Japan 0%0 of 278
  3. =2000TagawaFukuoka, Japan 0%0 of 272
  4. =2000ShimonosekiYamaguchi, Japan 0%0 of 282
  5. =2000ShibataNiigata, Japan 0%0 of 269
  6. =2000KurayoshiTottori, Japan 0%0 of 256
  7. =2000KikuchiKumamoto, Japan 0%0 of 273
  8. =2000IkedachōTokushima, Japan 0%0 of 276
  9. =2000IizukaFukuoka, Japan 0%0 of 268
  10. =2000HōryūjiNara, Japan 0%0 of 276
  11. =2000Fukui-shiFukui, Japan 0%0 of 280
  12. =2000MinawaKanagawa, Japan 0%0 of 275
  13. =2000NagaiYamagata, Japan 0%0 of 245
  14. =2000Texarkanalast full day 11 OctTexas, United States 0%0 of 272
  15. =2000InglewoodCalifornia, United States 0%0 of 230
  16. =2016YokkaichiMie, Japan 0%0 of 282
  17. =2016HonmachiKumamoto, Japan 0%0 of 276
  18. =2016SumotoHyōgo, Japan 0%0 of 257
  19. =2016SagaSaga, Japan 0%0 of 280
  20. =2016OsakaOsaka, Japan 0%0 of 275
  21. =2016NishiwakiHyōgo, Japan 0%0 of 282
  22. =2016HiroshimaHiroshima, Japan 0%0 of 282
  23. =2016Himimachilast full day 22 SeptToyama, Japan 0%0 of 247
  24. =2016GyōdaSaitama, Japan 0%0 of 271
  25. =2016Laudio / LlodioBasque Country, Spain 0%0 of 285
  26. =2016Timberwood ParkTexas, United States 0%0 of 284
  27. =2016Wells BranchTexas, United States 0%0 of 268
  28. =2016CalexicoCalifornia, United States 0%0 of 280
  29. =2016MaderaCalifornia, United States 0%0 of 277
  30. =2016San Diegolast full day 11 OctCalifornia, United States 0%0 of 280
  31. =2016Imizulast full day 22 SeptToyama, Japan 0%0 of 260
  32. =2016JōetsuNiigata, Japan 0%0 of 274
  33. =2016MatsusakaMie, Japan 0%0 of 282
  34. =2034AkashiHyōgo, Japan 0%0 of 282
  35. =2034TakahashiOkayama, Japan 0%0 of 280
  36. =2034OnoHyōgo, Japan 0%0 of 279
  37. =2034MiharaHiroshima, Japan 0%0 of 281
  38. =2034KishiwadaOsaka, Japan 0%0 of 275
  39. =2034KashimaSaga, Japan 0%0 of 278
  40. =2034Kanzakimachi-kanzakiSaga, Japan 0%0 of 282
  41. =2034HekinanAichi, Japan 0%0 of 267
  42. =2034AnanTokushima, Japan 0%0 of 261
  43. =2034SukayamaChiba, Japan 0%0 of 273
  44. =2034ItaquaquecetubaSão Paulo, Brazil 0%0 of 282
  45. =2034Lacy-LakeviewTexas, United States 0%0 of 262
  46. =2034TakuSaga, Japan 0%0 of 278
  47. =2047TsuyamaOkayama, Japan 0%0 of 275
  48. =2047TomiokaGunma, Japan 0%0 of 261
  49. =2047TakeoSaga, Japan 0%0 of 280
  50. =2047Takaokalast full day 22 SeptToyama, Japan 0%0 of 261
  51. =2047Narutochō-mitsuishiTokushima, Japan 0%0 of 276
  52. =2047MinamirinkanKanagawa, Japan 0%0 of 254
  53. =2047KashiwaraNara, Japan 0%0 of 278
  54. =2047AsakaSaitama, Japan 0%0 of 273
  55. =2047La Línea de la ConcepciónAndalusia, Spain 0%0 of 279
  56. =2047Arzberglast full day 10 OctBavaria, Germany 0%0 of 280
  57. =2047Long BeachCalifornia, United States 0%0 of 281
  58. =2047MercedCalifornia, United States 0%0 of 285
  59. =2047OgōriFukuoka, Japan 0%0 of 259
  60. =2047TōkaiAichi, Japan 0%0 of 282
  61. =2047NantanKyoto, Japan 0%0 of 279
  62. =2062UbeYamaguchi, Japan 0%0 of 282
  63. =2062TakeharaHiroshima, Japan 0%0 of 281
  64. =2062SakaiOsaka, Japan 0%0 of 275
  65. =2062OkazakiAichi, Japan 0%0 of 282
  66. =2062OkayamaOkayama, Japan 0%0 of 282
  67. =2062ŌitaOita, Japan 0%0 of 275
  68. =2062NōgataFukuoka, Japan 0%0 of 270
  69. =2062NishioAichi, Japan 0%0 of 279
  70. =2062KyotoKyoto, Japan 0%0 of 279
  71. =2062KogaFukuoka, Japan 0%0 of 270
  72. =2062KainanWakayama, Japan 0%0 of 282
  73. =2062IwashitaKumamoto, Japan 0%0 of 274
  74. =2062IwakuniYamaguchi, Japan 0%0 of 282
  75. =2062HagiYamaguchi, Japan 0%0 of 264
  76. =2062HachiōjiTokyo, Japan 0%0 of 280
  77. =2062FukuroiShizuoka, Japan 0%0 of 229
  78. =2062BilbaoBasque Country, Spain 0%0 of 286
  79. =2062São José dos Camposlast full day 8 OctSão Paulo, Brazil 0%0 of 278
  80. =2062MonroeLouisiana, United States 0%0 of 267
  81. =2062Fort WorthTexas, United States 0%0 of 285
  82. =2062UkihaFukuoka, Japan 0%0 of 272
  83. =2062ItoshimaFukuoka, Japan 0%0 of 277
  84. =2084SuzukaMie, Japan 0%0 of 282
  85. =2084SekimachiGifu, Japan 0%0 of 281
  86. =2084SandachōHyōgo, Japan 0%0 of 282
  87. =2084OyamaTochigi, Japan 0%0 of 278
  88. =2084NishinomiyaHyōgo, Japan 0%0 of 282
  89. =2084KōtariKyoto, Japan 0%0 of 279
  90. =2084Kashima-shiIbaraki, Japan 0%0 of 276
  91. =2084InuyamaAichi, Japan 0%0 of 255
  92. =2084IyoEhime, Japan 0%0 of 279
  93. =2084NakaIbaraki, Japan 0%0 of 269
  94. =2084LiverpoolNew South Wales, Australia 0%0 of 248
  95. =2084InnsbruckTyrol, Austria 0%0 of 286
  96. =2084MâconBourgogne-Franche-Comté, France 0%0 of 277
  97. =2084BayonneNew Aquitaine, France 0%0 of 286
  98. =2084Gasteiz / VitoriaBasque Country, Spain 0%0 of 285
  99. =2084CeeGalicia, Spain 0%0 of 243
  100. =2084MontgomeryAlabama, United States 0%0 of 279

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).