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. 201ValdiviaLos Ríos Region, Chile 10%3 of 29
  2. 202Puerto AysénAysén, Chile 10%3 of 29
  3. 203SantiagoSantiago Metropolitan, Chile 10%3 of 29
  4. 204IbadanOyo State, Nigeria 10%3 of 30
  5. 205LagosLagos, Nigeria 10%3 of 30
  6. 206Quezon CityNational Capital Region, Philippines 10%3 of 30
  7. 207PrijedorSrpska, Bosnia and Herzegovina 10%3 of 30
  8. 208Târgu MureşMureș County, Romania 10%3 of 30
  9. 209Samut SakhonSamut Sakhon, Thailand 10%3 of 30
  10. 210TulareCalifornia, United States 10%3 of 30
  11. 211BarbilOdisha, India 10%2 of 21
  12. 212TuxtlaChiapas, Mexico 10%2 of 21
  13. 213Rovinarilast full day 10 OctGorj County, Romania 10%2 of 21
  14. 214TalojeMaharashtra, India 9%2 of 22
  15. 215Chik Ballāpurlast full day 11 OctKarnataka, India 9%2 of 22
  16. 216PatiālaPunjab, India 9%2 of 23
  17. 217Central SaanichBritish Columbia, Canada 9%2 of 23
  18. 218SasolburgFree State, South Africa 8%2 of 24
  19. 219BilāspurChhattisgarh, India 8%2 of 24
  20. 220Sannazzaro de' BurgondiLombardy, Italy 8%2 of 24
  21. 221JabalpurMadhya Pradesh, India 8%2 of 25
  22. 222JaisalmerRajasthan, India 8%2 of 25
  23. 223JodhpurRajasthan, India 8%2 of 26
  24. 224BengaluruKarnataka, India 8%2 of 26
  25. 225TshiterekeLimpopo, South Africa 8%2 of 26
  26. 226Târgu Jiulast full day 10 OctGorj County, Romania 7%2 of 27
  27. 227SecundaMpumalanga, South Africa 7%2 of 28
  28. 228CuranilahueBiobio, Chile 7%2 of 29
  29. =229PolokwaneLimpopo, South Africa 7%2 of 29
  30. =229SeonghwanChungcheongnam-do, South Korea 7%2 of 29
  31. 231ThabazimbiLimpopo, South Africa 7%2 of 29
  32. 232ThembisaGauteng, South Africa 7%2 of 29
  33. 233Banja LukaSrpska, Bosnia and Herzegovina 7%2 of 30
  34. 234TalgharAlmaty Region, Kazakhstan 7%2 of 30
  35. 235PyeongtaekGyeonggi-do, South Korea 7%2 of 30
  36. 236OpoleOpole Voivodeship, Poland 7%2 of 30
  37. 237LaturMaharashtra, India 5%1 of 21
  38. 238Betonglast full day 11 OctYala, Thailand 5%1 of 21
  39. 239KaragandyKaraganda, Kazakhstan 5%1 of 21
  40. 240OuagadougouCentre, Burkina Faso 5%1 of 22
  41. 241Bayonnelast full day 11 OctNew Jersey, United States 5%1 of 22
  42. 242KatiharBihar, India 4%1 of 23
  43. 243JājangOdisha, India 4%1 of 24
  44. 244PuducherryPuducherry, India 4%1 of 24
  45. 245Indorelast full day 10 OctMadhya Pradesh, India 4%1 of 24
  46. 246ModimolleLimpopo, South Africa 4%1 of 24
  47. 247RatlāmMadhya Pradesh, India 4%1 of 25
  48. 248RourkelaOdisha, India 4%1 of 25
  49. 249AkolaMaharashtra, India 4%1 of 25
  50. 250KolhāpurMaharashtra, India 4%1 of 25
  51. 251SaltilloCoahuila, Mexico 4%1 of 25
  52. 252CrescentinoPiedmont, Italy 4%1 of 25
  53. 253Santa Lucíalast full day 11 OctCanary Islands, Spain 4%1 of 25
  54. 254SzegedCsongrád, Hungary 4%1 of 25
  55. 255PatnaBihar, India 4%1 of 26
  56. 256San CarlosÑuble, Chile 4%1 of 26
  57. 257AmravatiMaharashtra, India 4%1 of 26
  58. 258JalorRajasthan, India 4%1 of 26
  59. 259RājgīrBihar, India 4%1 of 26
  60. 260TocopillaAntofagasta, Chile 4%1 of 26
  61. 261MokopaneLimpopo, South Africa 4%1 of 26
  62. 262EvatonGauteng, South Africa 4%1 of 27
  63. 263ArrecifeCanary Islands, Spain 4%1 of 27
  64. 264MarikanaNorth West, South Africa 4%1 of 28
  65. 265PhalaborwaLimpopo, South Africa 4%1 of 28
  66. 266RancaguaO'Higgins Region, Chile 3%1 of 29
  67. 267ChillánÑuble, Chile 3%1 of 29
  68. 268LinaresMaule Region, Chile 3%1 of 29
  69. 269TalcaMaule Region, Chile 3%1 of 29
  70. 270RengoO'Higgins Region, Chile 3%1 of 29
  71. 271ErlunTaiwan, Taiwan 3%1 of 29
  72. 272TetovoTetovo, North Macedonia 3%1 of 29
  73. 273CanberraAustralian Capital Territory, Australia 3%1 of 29
  74. =274Novi PazarCentral Serbia, Serbia 3%1 of 30
  75. =274ZagrebZagreb, Croatia 3%1 of 30
  76. =276OtwockMazovia, Poland 3%1 of 30
  77. =276AmandelbultLimpopo, South Africa 3%1 of 30
  78. 278Phra PradaengSamut Prakan, Thailand 3%1 of 30
  79. 279MexicaliBaja California, Mexico 3%1 of 30
  80. 280KaliszGreater Poland, Poland 3%1 of 30
  81. 281RadomskoŁódź Voivodeship, Poland 3%1 of 30
  82. 282Tin Shui WaiYuen Long, Hong Kong 3%1 of 30
  83. 283PattaniPattani, Thailand 3%1 of 30
  84. 284PruszkówMazovia, Poland 3%1 of 30
  85. 285BeirutBeirut, Lebanon 3%1 of 30
  86. 286KrompachyKošice Region, Slovakia 3%1 of 30
  87. 287Mladá BoleslavCentral Bohemia, Czechia 3%1 of 30
  88. 288DouglasGeorgia, United States 3%1 of 30
  89. 289HooEngland, United Kingdom 3%1 of 30
  90. 290SatnaMadhya Pradesh, India 0%0 of 26
  91. 291HyderabadTelangana, India 0%0 of 26
  92. 292Uliyazhathuralast full day 7 OctKerala, India 0%0 of 23
  93. 293QuettaBalochistan, Pakistan 0%0 of 30
  94. 294HubballiKarnataka, India 0%0 of 21
  95. 295RājsamandRajasthan, India 0%0 of 26
  96. 296Hacienda Santa FeJalisco, Mexico 0%0 of 30
  97. =297IstanbulIstanbul, Turkey 0%0 of 30
  98. =297NāgaurRajasthan, India 0%0 of 26
  99. 299TemucoAraucania, Chile 0%0 of 29
  100. 300SilcharAssam, India 0%0 of 25

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).