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. =700KrosnoSubcarpathia, Poland 0%0 of 30
  2. =700JasłoSubcarpathia, Poland 0%0 of 30
  3. =700Chiang RaiChiang Rai, Thailand 0%0 of 25
  4. =700DaxiTaiwan, Taiwan 0%0 of 30
  5. =700YilanTaiwan, Taiwan 0%0 of 29
  6. =700KeelungTaiwan, Taiwan 0%0 of 30
  7. =700GongjuChungcheongnam-do, South Korea 0%0 of 29
  8. =700HayangGyeongsangbuk-do, South Korea 0%0 of 29
  9. =700JungpyongNorth Chungcheong, South Korea 0%0 of 29
  10. =700MinamataKumamoto, Japan 0%0 of 30
  11. =700ZumarragaBasque Country, Spain 0%0 of 22
  12. =700CuencaCastille-La Mancha, Spain 0%0 of 30
  13. =700Vareselast full day 11 OctLombardy, Italy 0%0 of 28
  14. =700Ciudad General EscobedoNuevo León, Mexico 0%0 of 26
  15. =700DallasTexas, United States 0%0 of 30
  16. =700KotōKumamoto, Japan 0%0 of 30
  17. =717Codlealast full day 10 OctBrașov County, Romania 0%0 of 21
  18. =717Bucharestlast full day 10 OctBucharest, Romania 0%0 of 27
  19. =717Nakhon NayokNakhon Nayok, Thailand 0%0 of 30
  20. =717Ban Thai TanAng Thong, Thailand 0%0 of 30
  21. =717MungyeongGyeongsangbuk-do, South Korea 0%0 of 24
  22. =717ImsilJeollabuk-do, South Korea 0%0 of 29
  23. =717HwasunJeollanam-do, South Korea 0%0 of 23
  24. =717ChangwonGyeongsangnam-do, South Korea 0%0 of 30
  25. =717ChangsuJeollabuk-do, South Korea 0%0 of 28
  26. =717MiyakonojōMiyazaki, Japan 0%0 of 30
  27. =717GdyniaPomerania, Poland 0%0 of 30
  28. =717PodgoricaPodgorica, Montenegro 0%0 of 26
  29. =717MaconGeorgia, United States 0%0 of 30
  30. =717MercedCalifornia, United States 0%0 of 30
  31. =717KamisuIbaraki, Japan 0%0 of 30
  32. =732Suphan BuriSuphan Buri, Thailand 0%0 of 30
  33. =732TaharaAichi, Japan 0%0 of 30
  34. =732HekinanAichi, Japan 0%0 of 30
  35. =732CandelariaCanary Islands, Spain 0%0 of 28
  36. =732GiubiascoTicino, Switzerland 0%0 of 29
  37. =732Berlinlast full day 11 OctState of Berlin, Germany 0%0 of 26
  38. =732EsztergomKomárom-Esztergom, Hungary 0%0 of 30
  39. =732StudénkaMoravian-Silesian Region, Czechia 0%0 of 30
  40. =732Moravská Třeboválast full day 11 OctPardubice Region, Czechia 0%0 of 28
  41. =732TrentoTrentino-Alto Adige, Italy 0%0 of 30
  42. =732Peschiera del GardaVeneto, Italy 0%0 of 29
  43. =732BakersfieldCalifornia, United States 0%0 of 30
  44. =732WhittierCalifornia, United States 0%0 of 30
  45. =732HadongGyeongsangnam-do, South Korea 0%0 of 27
  46. =746Otopenilast full day 10 OctIlfov, Romania 0%0 of 27
  47. =746TrebišovKošice Region, Slovakia 0%0 of 26
  48. =746YecheonGyeongsangbuk-do, South Korea 0%0 of 28
  49. =746Uekimachi-mōnoKumamoto, Japan 0%0 of 30
  50. =746HitoyoshiKumamoto, Japan 0%0 of 30
  51. =746Seongnam-siGyeonggi-do, South Korea 0%0 of 30
  52. =746ZvolenBanská Bystrica Region, Slovakia 0%0 of 28
  53. =746RoveretoTrentino-Alto Adige, Italy 0%0 of 30
  54. =746Ribeirão PretoSão Paulo, Brazil 0%0 of 30
  55. =746Ferraz de VasconcelosSão Paulo, Brazil 0%0 of 30
  56. =746ComptonCalifornia, United States 0%0 of 30
  57. =746Los AngelesCalifornia, United States 0%0 of 30
  58. =746San Diegolast full day 11 OctCalifornia, United States 0%0 of 28
  59. =746HyūgaMiyazaki, Japan 0%0 of 30
  60. =746MinamikyushuKagoshima, Japan 0%0 of 30
  61. =761KazincbarcikaBorsod-Abaúj-Zemplén, Hungary 0%0 of 30
  62. =761RevúcaBanská Bystrica Region, Slovakia 0%0 of 30
  63. =761HumennéPrešov Region, Slovakia 0%0 of 30
  64. =761DębicaSubcarpathia, Poland 0%0 of 30
  65. =761YeongjuGyeongsangbuk-do, South Korea 0%0 of 30
  66. =761TokiGifu, Japan 0%0 of 30
  67. =761OnomichiHiroshima, Japan 0%0 of 30
  68. =761KobayashiMiyazaki, Japan 0%0 of 30
  69. =761MeulebekeFlanders, Belgium 0%0 of 30
  70. =761ŽarnovicaBanská Bystrica Region, Slovakia 0%0 of 30
  71. =761ZnojmoSouth Moravian, Czechia 0%0 of 30
  72. =761Hradec KrálovéHradec Králové Region, Czechia 0%0 of 30
  73. =761ManlleuCatalonia, Spain 0%0 of 29
  74. =761MantuaLombardy, Italy 0%0 of 29
  75. =761Fierlast full day 8 OctFier County, Albania 0%0 of 25
  76. =761MonroeLouisiana, United States 0%0 of 30
  77. =761RichmondCalifornia, United States 0%0 of 22
  78. =778SantyokuGangwon-do, South Korea 0%0 of 30
  79. =778NaesŏGyeongsangnam-do, South Korea 0%0 of 30
  80. =778VallettaValletta, Malta 0%0 of 29
  81. =778NiceProvence-Alpes-Côte d'Azur, France 0%0 of 30
  82. =778RužomberokŽilina Region, Slovakia 0%0 of 30
  83. =778MostÚstí nad Labem Region, Czechia 0%0 of 30
  84. =778BeneventoCampania, Italy 0%0 of 29
  85. =778NikšićOpština Nikšić, Montenegro 0%0 of 30
  86. =778KutinaSisak-Moslavina, Croatia 0%0 of 30
  87. =778Santo AndréSão Paulo, Brazil 0%0 of 29
  88. =778MarionArkansas, United States 0%0 of 30
  89. =789Ubon RatchathaniUbon Ratchathani, Thailand 0%0 of 30
  90. =789Sing BuriSing Buri, Thailand 0%0 of 29
  91. =789YangsanGyeongsangnam-do, South Korea 0%0 of 28
  92. =789GangneungGangwon-do, South Korea 0%0 of 30
  93. =789AnseongGyeonggi-do, South Korea 0%0 of 29
  94. =789AndongGyeongsangbuk-do, South Korea 0%0 of 29
  95. =789TomiokaKumamoto, Japan 0%0 of 30
  96. =789TakanabeMiyazaki, Japan 0%0 of 30
  97. =789HiwasauraTokushima, Japan 0%0 of 30
  98. =789YeosuJeollanam-do, South Korea 0%0 of 30
  99. =789PúchovTrenčín Region, Slovakia 0%0 of 30
  100. =789KarvináMoravian-Silesian Region, Czechia 0%0 of 30

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), 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).