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. 300Wan ChaiWan Chai, Hong Kong 0%0 of 29
  2. 302CuricóMaule Region, Chile 0%0 of 29
  3. 303HualquiBiobio, Chile 0%0 of 29
  4. 304CoronelBiobio, Chile 0%0 of 28
  5. 305Los ÁngelesBiobio, Chile 0%0 of 28
  6. =306AshaimanGreater Accra, Ghana 0%0 of 30
  7. =306AricaArica y Parinacota Region, Chile 0%0 of 29
  8. =306QuthbullapurTelangana, India 0%0 of 26
  9. 309ObrenovacCentral Serbia, Serbia 0%0 of 30
  10. =310Cremonalast full day 11 OctLombardy, Italy 0%0 of 28
  11. =310CauquenesMaule Region, Chile 0%0 of 29
  12. 312AhilyanagarMaharashtra, India 0%0 of 24
  13. 313Naharlagunlast full day 7 OctArunachal Pradesh, India 0%0 of 21
  14. 314LotaBiobio, Chile 0%0 of 26
  15. =315TokozaGauteng, South Africa 0%0 of 27
  16. =315AntofagastaAntofagasta, Chile 0%0 of 24
  17. =317QuinteroValparaiso, Chile 0%0 of 29
  18. =317San Pedro de la PazBiobio, Chile 0%0 of 29
  19. 319eMbalenhleMpumalanga, South Africa 0%0 of 30
  20. =320FīrozābādUttar Pradesh, India 0%0 of 21
  21. =320Khon KaenKhon Kaen, Thailand 0%0 of 29
  22. =320TalaganteSantiago Metropolitan, Chile 0%0 of 29
  23. =320ConcónValparaiso, Chile 0%0 of 27
  24. 324Khlong LuangPathum Thani, Thailand 0%0 of 29
  25. =325ToméBiobio, Chile 0%0 of 24
  26. =325Lak SiBangkok, Thailand 0%0 of 30
  27. 327TalcahuanoBiobio, Chile 0%0 of 29
  28. 328Khlong Sam WaBangkok, Thailand 0%0 of 30
  29. =329KimjeJeollabuk-do, South Korea 0%0 of 28
  30. =329PuchuncavíValparaiso, Chile 0%0 of 26
  31. 331La SerenaCoquimbo Region, Chile 0%0 of 26
  32. =332QuillotaValparaiso, Chile 0%0 of 29
  33. =332CopiapóAtacama, Chile 0%0 of 24
  34. =332TijuanaBaja California, Mexico 0%0 of 28
  35. 335Khan Na YaoBangkok, Thailand 0%0 of 30
  36. =336SmederevoCentral Serbia, Serbia 0%0 of 30
  37. =336GuwahatiAssam, India 0%0 of 26
  38. =336Lat KrabangBangkok, Thailand 0%0 of 30
  39. =339Ban Samae DamBangkok, Thailand 0%0 of 30
  40. =339MokpoJeollanam-do, South Korea 0%0 of 28
  41. =341NaduvattamTamil Nadu, India 0%0 of 23
  42. =341Bang NaBangkok, Thailand 0%0 of 30
  43. 343Monzalast full day 11 OctLombardy, Italy 0%0 of 24
  44. =344SirohiRajasthan, India 0%0 of 26
  45. =344NohanPunjab, India 0%0 of 26
  46. =344Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand 0%0 of 26
  47. =347TemaGreater Accra, Ghana 0%0 of 30
  48. =347UžiceCentral Serbia, Serbia 0%0 of 30
  49. =347Viña del MarValparaiso, Chile 0%0 of 27
  50. 350CoquimboCoquimbo Region, Chile 0%0 of 29
  51. 351Mae SaiChiang Rai, Thailand 0%0 of 30
  52. =352BakuBaki, Azerbaijan 0%0 of 30
  53. =352VirārMaharashtra, India 0%0 of 23
  54. =352ZhushanTaiwan, Taiwan 0%0 of 30
  55. =352Trevigliolast full day 11 OctLombardy, Italy 0%0 of 28
  56. =356SibsāgarAssam, India 0%0 of 26
  57. =356HuascoAtacama, Chile 0%0 of 27
  58. =358Si Maha PhotPrachin Buri, Thailand 0%0 of 23
  59. =358ErlinTaiwan, Taiwan 0%0 of 30
  60. =358WanjuJeollabuk-do, South Korea 0%0 of 29
  61. =358NandriRajasthan, India 0%0 of 21
  62. =362SrinagarJammu and Kashmir, India 0%0 of 23
  63. =362ChiguayanteBiobio, Chile 0%0 of 28
  64. =364DouliuTaiwan, Taiwan 0%0 of 30
  65. =364YuanlinTaiwan, Taiwan 0%0 of 30
  66. =364PubalGyeonggi-do, South Korea 0%0 of 27
  67. =367YerevanYerevan, Armenia 0%0 of 30
  68. =367Suceavalast full day 10 OctSuceava, Romania 0%0 of 27
  69. 369JinchengFukien, Taiwan 0%0 of 30
  70. =370BelgradeCentral Serbia, Serbia 0%0 of 30
  71. =370BalfourMpumalanga, South Africa 0%0 of 26
  72. =370Dalminelast full day 11 OctLombardy, Italy 0%0 of 23
  73. =370JeongeupJeollabuk-do, South Korea 0%0 of 29
  74. =374ConcepciónBiobio, Chile 0%0 of 23
  75. =374MeccaCalifornia, United States 0%0 of 30
  76. =376BānswāraRajasthan, India 0%0 of 25
  77. =376BeigangTaiwan, Taiwan 0%0 of 30
  78. =376Santa AnitaJalisco, Mexico 0%0 of 30
  79. =379LodiLombardy, Italy 0%0 of 26
  80. =379GuadalajaraJalisco, Mexico 0%0 of 30
  81. =381PietermaritzburgKwaZulu-Natal, South Africa 0%0 of 29
  82. =381Nong KhaemBangkok, Thailand 0%0 of 30
  83. =381Naucalpan de JuárezMéxico, Mexico 0%0 of 30
  84. 384PljevljaPljevlja, Montenegro 0%0 of 30
  85. =385BadlapurMaharashtra, India 0%0 of 26
  86. =385AlmatyAlmaty, Kazakhstan 0%0 of 30
  87. =385TangjinChungcheongnam-do, South Korea 0%0 of 28
  88. =385VinovoPiedmont, Italy 0%0 of 30
  89. =389Gimpo-siGyeonggi-do, South Korea 0%0 of 30
  90. =389MortaraLombardy, Italy 0%0 of 29
  91. =391Kalaburagilast full day 11 OctKarnataka, India 0%0 of 25
  92. =391Bang KapiBangkok, Thailand 0%0 of 30
  93. =391BuanJeollabuk-do, South Korea 0%0 of 28
  94. =391Alcalá de GuadairaAndalusia, Spain 0%0 of 30
  95. =391AlessandriaPiedmont, Italy 0%0 of 30
  96. =391AguascalientesAguascalientes, Mexico 0%0 of 28
  97. =397YeojuGyeonggi-do, South Korea 0%0 of 30
  98. =397Kraaifonteinlast full day 8 OctWestern Cape, South Africa 0%0 of 24
  99. =399Nakhon RatchasimaNakhon Ratchasima, Thailand 0%0 of 30
  100. =399YesanChungcheongnam-do, South Korea 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).