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. 2168FuefukiYamanashi, Japan 0%0 of 261
  2. =2202YoriiSaitama, Japan 0%0 of 281
  3. =2202YokotaTokyo, Japan 0%0 of 276
  4. =2202YamaguchiYamaguchi, Japan 0%0 of 282
  5. =2202YaeHiroshima, Japan 0%0 of 280
  6. =2202Uozulast full day 22 SeptToyama, Japan 0%0 of 249
  7. =2202UjiKyoto, Japan 0%0 of 279
  8. =2202TokyoTokyo, Japan 0%0 of 282
  9. =2202TakayamaGifu, Japan 0%0 of 281
  10. =2202ŌmuraNagasaki, Japan 0%0 of 280
  11. =2202NabariMie, Japan 0%0 of 279
  12. =2202MiyazakiMiyazaki, Japan 0%0 of 281
  13. =2202KudamatsuYamaguchi, Japan 0%0 of 282
  14. =2202KōnosuSaitama, Japan 0%0 of 282
  15. =2202Kodamachō-kodamaminamiSaitama, Japan 0%0 of 268
  16. =2202Kazolast full day 6 OctSaitama, Japan 0%0 of 275
  17. =2202KawatanaNagasaki, Japan 0%0 of 280
  18. =2202KawaguchiSaitama, Japan 0%0 of 282
  19. =2202Kashihara-shiNara, Japan 0%0 of 280
  20. =2202KameyamaMie, Japan 0%0 of 275
  21. =2202KameokaKyoto, Japan 0%0 of 277
  22. =2202Izumolast full day 11 OctShimane, Japan 0%0 of 276
  23. =2202IseMie, Japan 0%0 of 282
  24. =2202HitoyoshiKumamoto, Japan 0%0 of 269
  25. =2202HikoneShiga, Japan 0%0 of 277
  26. =2202AshikagaTochigi, Japan 0%0 of 213
  27. =2202MarignaneProvence-Alpes-Côte d'Azur, France 0%0 of 279
  28. =2202Baume-les-DamesBourgogne-Franche-Comté, France 0%0 of 283
  29. =2202ArlesProvence-Alpes-Côte d'Azur, France 0%0 of 278
  30. =2202ZaragozaAragon, Spain 0%0 of 228
  31. =2202EvansvilleIndiana, United States 0%0 of 286
  32. =2202AshlandKentucky, United States 0%0 of 286
  33. =2202OwensboroKentucky, United States 0%0 of 283
  34. =2202MorrisvilleNorth Carolina, United States 0%0 of 285
  35. =2202Ponca CityOklahoma, United States 0%0 of 271
  36. =2202OceansideCalifornia, United States 0%0 of 282
  37. =2202RichmondCalifornia, United States 0%0 of 203
  38. =2202ShintomiMiyazaki, Japan 0%0 of 277
  39. =2202JōsōIbaraki, Japan 0%0 of 251
  40. =2202Higashi-MatsuyamaSaitama, Japan 0%0 of 281
  41. =2202KinokawaWakayama, Japan 0%0 of 271
  42. =2202BuzenFukuoka, Japan 0%0 of 274
  43. =2202SugaiKyoto, Japan 0%0 of 279
  44. =2202KuwanaMie, Japan 0%0 of 282
  45. =2202MizuhoGifu, Japan 0%0 of 278
  46. =2246YaoOsaka, Japan 0%0 of 272
  47. =2246Ueno-ebisumachiMie, Japan 0%0 of 230
  48. =2246TsuruokaYamagata, Japan 0%0 of 261
  49. =2246TsubataIshikawa, Japan 0%0 of 271
  50. =2246TakatsukiOsaka, Japan 0%0 of 246
  51. =2246TakarazukaHyōgo, Japan 0%0 of 282
  52. =2246MorohongōSaitama, Japan 0%0 of 269
  53. =2246MieOita, Japan 0%0 of 280
  54. =2246KusatsuShiga, Japan 0%0 of 282
  55. =2246KoshigayaSaitama, Japan 0%0 of 278
  56. =2246KanbaraShizuoka, Japan 0%0 of 276
  57. =2246IzumiKagoshima, Japan 0%0 of 273
  58. =2246GifuGifu, Japan 0%0 of 270
  59. =2246GamagōriAichi, Japan 0%0 of 282
  60. =2246ChiryūAichi, Japan 0%0 of 276
  61. =2246IwanumaMiyagi, Japan 0%0 of 280
  62. =2246ChristchurchCanterbury, New Zealand 0%0 of 280
  63. =2246AlgecirasAndalusia, Spain 0%0 of 241
  64. =2246ScunthorpeEngland, United Kingdom 0%0 of 201
  65. =2246LavalPays de la Loire, France 0%0 of 284
  66. =2246La GardeProvence-Alpes-Côte d'Azur, France 0%0 of 277
  67. =2246Le LamentinMartinique, Martinique 0%0 of 245
  68. =2246LawrencevilleGeorgia, United States 0%0 of 282
  69. =2246MiddlesboroKentucky, United States 0%0 of 281
  70. =2246Valley StationKentucky, United States 0%0 of 283
  71. =2246St. LouisMissouri, United States 0%0 of 285
  72. =2246CharlotteNorth Carolina, United States 0%0 of 286
  73. =2246Winston-SalemNorth Carolina, United States 0%0 of 282
  74. =2246GlenpoolOklahoma, United States 0%0 of 263
  75. =2246Port ArthurTexas, United States 0%0 of 235
  76. =2246Lake ElsinoreCalifornia, United States 0%0 of 281
  77. =2246KasugaFukuoka, Japan 0%0 of 275
  78. =2246KirishimaKagoshima, Japan 0%0 of 274
  79. =2246ShonaiYamagata, Japan 0%0 of 249
  80. =2246MineYamaguchi, Japan 0%0 of 282
  81. =2246JōyōKyoto, Japan 0%0 of 279
  82. =2282SendaiKagoshima, Japan 0%0 of 275
  83. =2282Sakai-nakajimaGunma, Japan 0%0 of 269
  84. =2282NodaChiba, Japan 0%0 of 271
  85. =2282NakamuraKochi, Japan 0%0 of 257
  86. =2282MikuniFukui, Japan 0%0 of 279
  87. =2282KawaguchiTokushima, Japan 0%0 of 234
  88. =2282IzumiOsaka, Japan 0%0 of 267
  89. =2282IwataShizuoka, Japan 0%0 of 273
  90. =2282Chichibulast full day 24 SeptSaitama, Japan 0%0 of 249
  91. =2282Natori-shiMiyagi, Japan 0%0 of 281
  92. =2282IwakiFukushima, Japan 0%0 of 261
  93. =2282HokotaIbaraki, Japan 0%0 of 270
  94. =2282OcalaFlorida, United States 0%0 of 278
  95. =2282CorsicanaTexas, United States 0%0 of 270
  96. =2282River OaksTexas, United States 0%0 of 268
  97. =2282El CajonCalifornia, United States 0%0 of 282
  98. =2282IrumaSaitama, Japan 0%0 of 267
  99. =2282KosaiShizuoka, Japan 0%0 of 282
  100. =2282HabikinoOsaka, Japan 0%0 of 270

What stands behind each figure: Checked at 2+ sites One reference monitor Low-cost sensors About these marks

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).