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. =900San RoqueAndalusia, Spain 0%0 of 30
  2. =900Valašské MeziříčíZlín, Czechia 0%0 of 30
  3. =900NaplesCampania, Italy 0%0 of 29
  4. =900Oklahoma CityOklahoma, United States 0%0 of 29
  5. =905Yangp'yŏngGyeonggi-do, South Korea 0%0 of 28
  6. =905KimhaeGyeongsangnam-do, South Korea 0%0 of 30
  7. =905TogitsuNagasaki, Japan 0%0 of 30
  8. =905SusakiKochi, Japan 0%0 of 30
  9. =905Shin’ichiHiroshima, Japan 0%0 of 30
  10. =905NiihamaEhime, Japan 0%0 of 30
  11. =905GwangyangJeollanam-do, South Korea 0%0 of 29
  12. =905MostaIl-Mosta, Malta 0%0 of 30
  13. =905EnnsUpper Austria, Austria 0%0 of 30
  14. =905PardubicePardubice Region, Czechia 0%0 of 30
  15. =905KadaňÚstí nad Labem Region, Czechia 0%0 of 30
  16. =905SzczecinWest Pomerania, Poland 0%0 of 30
  17. =905SopotPomerania, Poland 0%0 of 30
  18. =905MadridMadrid, Spain 0%0 of 30
  19. =905SalernoCampania, Italy 0%0 of 28
  20. =905Nocera InferioreCampania, Italy 0%0 of 29
  21. =905ColusaCalifornia, United States 0%0 of 30
  22. =905Mission ViejoCalifornia, United States 0%0 of 30
  23. =923GijangBusan, South Korea 0%0 of 27
  24. =923ChinjuGyeongsangnam-do, South Korea 0%0 of 28
  25. =923Tanushimarumachi-toyokiFukuoka, Japan 0%0 of 30
  26. =923KushikinoKagoshima, Japan 0%0 of 30
  27. =923UngsangGyeongsangnam-do, South Korea 0%0 of 30
  28. =923Teltowlast full day 10 OctBrandenburg, Germany 0%0 of 25
  29. =923MalackyBratislava Region, Slovakia 0%0 of 30
  30. =923Frýdek-MístekMoravian-Silesian Region, Czechia 0%0 of 30
  31. =923Gorzów WielkopolskiLubusz, Poland 0%0 of 30
  32. =923ZallaBasque Country, Spain 0%0 of 29
  33. =923CampinasSão Paulo, Brazil 0%0 of 30
  34. =923MontgomeryAlabama, United States 0%0 of 29
  35. =923SpringdaleArkansas, United States 0%0 of 30
  36. =923ChattanoogaTennessee, United States 0%0 of 29
  37. =923PasadenaTexas, United States 0%0 of 29
  38. =923InglewoodCalifornia, United States 0%0 of 30
  39. =939Isaccealast full day 10 OctTulcea County, Romania 0%0 of 27
  40. =939BraşovBrașov County, Romania 0%0 of 30
  41. =939PyeongchangGangwon-do, South Korea 0%0 of 30
  42. =939GoseongGyeongsangnam-do, South Korea 0%0 of 29
  43. =939ChiryūAichi, Japan 0%0 of 30
  44. =939BurrianaValencia, Spain 0%0 of 27
  45. =939LinzUpper Austria, Austria 0%0 of 30
  46. =939Oldenburglast full day 10 OctLower Saxony, Germany 0%0 of 27
  47. =939Dortmundlast full day 10 OctNorth Rhine-Westphalia, Germany 0%0 of 27
  48. =939Bösellast full day 10 OctLower Saxony, Germany 0%0 of 27
  49. =939BrnoSouth Moravian, Czechia 0%0 of 30
  50. =939KołobrzegWest Pomerania, Poland 0%0 of 21
  51. =939OriaBasque Country, Spain 0%0 of 30
  52. =939Santa Maria A VicoCampania, Italy 0%0 of 27
  53. =939BogotáBogota D.C., Colombia 0%0 of 30
  54. =939EdmondOklahoma, United States 0%0 of 29
  55. =939BartlettTennessee, United States 0%0 of 30
  56. =939Wells BranchTexas, United States 0%0 of 29
  57. =939AnaheimCalifornia, United States 0%0 of 30
  58. =939MantecaCalifornia, United States 0%0 of 30
  59. =939HigashigōSaga, Japan 0%0 of 30
  60. =960SidonSouth Governorate, Lebanon 0%0 of 30
  61. =960Timişoaralast full day 10 OctTimiș County, Romania 0%0 of 21
  62. =960VarnaVarna, Bulgaria 0%0 of 28
  63. =960Ohridlast full day 10 OctOhrid, North Macedonia 0%0 of 27
  64. =960SukhothaiSukhothai, Thailand 0%0 of 28
  65. =960SurinSurin, Thailand 0%0 of 28
  66. =960MinatoWakayama, Japan 0%0 of 30
  67. =960Sankt ValentinLower Austria, Austria 0%0 of 30
  68. =960Munichlast full day 11 OctBavaria, Germany 0%0 of 28
  69. =960PécsBaranya, Hungary 0%0 of 30
  70. =960TrnavaTrnava Region, Slovakia 0%0 of 30
  71. =960PiracicabaSão Paulo, Brazil 0%0 of 29
  72. =960Duque de CaxiasRio de Janeiro, Brazil 0%0 of 30
  73. =960Heroica MatamorosTamaulipas, Mexico 0%0 of 22
  74. =960CuernavacaMorelos, Mexico 0%0 of 22
  75. =960Granite CityIllinois, United States 0%0 of 30
  76. =960HattiesburgMississippi, United States 0%0 of 30
  77. =960Fort WorthTexas, United States 0%0 of 30
  78. =960Texarkanalast full day 11 OctTexas, United States 0%0 of 28
  79. =979TaitungTaiwan, Taiwan 0%0 of 30
  80. =979NagoyaAichi, Japan 0%0 of 30
  81. =979MiyazakiMiyazaki, Japan 0%0 of 30
  82. =979HandaAichi, Japan 0%0 of 30
  83. =979ValenciennesHauts-de-France, France 0%0 of 30
  84. =979ŠahyNitra Region, Slovakia 0%0 of 28
  85. =979České BudějoviceSouth Bohemian Region, Czechia 0%0 of 30
  86. =979Laudio / LlodioBasque Country, Spain 0%0 of 30
  87. =979CeeGalicia, Spain 0%0 of 30
  88. =979BeasainBasque Country, Spain 0%0 of 30
  89. =979Attnang-PuchheimUpper Austria, Austria 0%0 of 30
  90. =979SorocabaSão Paulo, Brazil 0%0 of 30
  91. =979ItaguaíRio de Janeiro, Brazil 0%0 of 27
  92. =979Santa CatarinaNuevo León, Mexico 0%0 of 25
  93. =979HighlandsTexas, United States 0%0 of 29
  94. =979WindcrestTexas, United States 0%0 of 28
  95. =979ShintomiMiyazaki, Japan 0%0 of 28
  96. =996BardejovPrešov Region, Slovakia 0%0 of 27
  97. =996PrzemyślSubcarpathia, Poland 0%0 of 30
  98. =996IlindenIlinden, North Macedonia 0%0 of 29
  99. =996KunwiGyeongsangbuk-do, South Korea 0%0 of 28
  100. =996ToyotaAichi, Japan 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).