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. 1300YoungstownOhio, United States 1%3 of 284
  2. 1302BremerhavenBremen, Germany 1%3 of 284
  3. 1303BurnsvilleMinnesota, United States 1%3 of 284
  4. 1304EriePennsylvania, United States 1%3 of 284
  5. 1305DanburyConnecticut, United States 1%3 of 284
  6. 1306Rochesterlast full day 11 OctNew York, United States 1%3 of 284
  7. 1307La Providencia Siglo XXIHidalgo, Mexico 1%3 of 285
  8. 1308Le HavreNormandy, France 1%3 of 285
  9. 1309ColumbusOhio, United States 1%3 of 285
  10. 1310TraleeMunster, Ireland 1%3 of 285
  11. 1311MenenFlanders, Belgium 1%3 of 285
  12. 1312CanonsburgPennsylvania, United States 1%3 of 285
  13. 1313WexfordLeinster, Ireland 1%3 of 285
  14. 1314RodezOccitanie, France 1%3 of 285
  15. 1315NitraNitra Region, Slovakia 1%3 of 286
  16. 1316MissionTexas, United States 1%3 of 286
  17. 1317PhiladelphiaPennsylvania, United States 1%3 of 286
  18. 1318LinzUpper Austria, Austria 1%3 of 286
  19. 1319KranjUrban Municipality of Kranj, Slovenia 1%3 of 286
  20. 1320Hainburg an der DonauLower Austria, Austria 1%3 of 286
  21. =1321JenbachTyrol, Austria 1%3 of 286
  22. =1321BordeauxNew Aquitaine, France 1%3 of 286
  23. 1323TrbovljeMunicipality of Trbovlje, Slovenia 1%3 of 286
  24. 1324ZelzateFlanders, Belgium 1%3 of 286
  25. 1325YpsilantiMichigan, United States 1%3 of 286
  26. 1326RoeselareFlanders, Belgium 1%3 of 286
  27. 1327Knokke-HeistFlanders, Belgium 1%3 of 286
  28. 1328WilmingtonDelaware, United States 1%3 of 286
  29. =1329AntwerpFlanders, Belgium 1%3 of 286
  30. =1329Warrensville HeightsOhio, United States 1%3 of 286
  31. =1331GrimbergenFlanders, Belgium 1%3 of 286
  32. =1331Natrona HeightsPennsylvania, United States 1%3 of 286
  33. =1333GentFlanders, Belgium 1%3 of 286
  34. =1333WashingtonDistrict of Columbia, United States 1%3 of 286
  35. 1335GrenobleAuvergne-Rhône-Alpes, France 1%3 of 286
  36. 1336Saint-QuentinHauts-de-France, France 1%3 of 286
  37. =1337MinneapolisMinnesota, United States 1%3 of 286
  38. =1337JohnstownPennsylvania, United States 1%3 of 286
  39. =1339NewarkDelaware, United States 1%3 of 286
  40. =1339Jersey CityNew Jersey, United States 1%3 of 286
  41. 1341MadisonWisconsin, United States 1%3 of 286
  42. =1342HarfleurNormandy, France 1%3 of 286
  43. =1342BlaineMinnesota, United States 1%3 of 286
  44. =1342ScrantonPennsylvania, United States 1%3 of 286
  45. 1345BridgeportConnecticut, United States 1%3 of 286
  46. =1346GlasgowDelaware, United States 1%3 of 286
  47. =1346BrainerdMinnesota, United States 1%3 of 286
  48. 1348CloquetMinnesota, United States 1%3 of 286
  49. 1349Apple ValleyMinnesota, United States 1%3 of 286
  50. 1350The DallesOregon, United States 1%3 of 286
  51. 1351EugeneOregon, United States 1%3 of 286
  52. 1352AlbanyOregon, United States 1%3 of 286
  53. 1353BeavertonOregon, United States 1%3 of 286
  54. 1354San MarcosHidalgo, Mexico no daily values yet1%2 of 201
  55. 1355Dún LaoghaireLeinster, Ireland 1%2 of 203
  56. 1356GothenburgVästra Götaland, Sweden 1%2 of 204
  57. 1357MoeVictoria, Australia 1%2 of 205
  58. 1358Sha TinSha Tin, Hong Kong 1%2 of 207
  59. 1359HooEngland, United Kingdom 1%2 of 208
  60. 1360Sau Mau PingKwun Tong District, Hong Kong 1%2 of 215
  61. 1361Atotonilco de TulaHidalgo, Mexico 1%2 of 217
  62. 1362MadikeriKarnataka, India 1%2 of 223
  63. 1363JülichNorth Rhine-Westphalia, Germany 1%2 of 229
  64. 1364AbasoloGuanajuato, Mexico 1%2 of 231
  65. 1365Jumillalast full day 11 OctMurcia, Spain 1%2 of 233
  66. 1366Tehuacánlast full day 7 OctPuebla, Mexico 1%2 of 236
  67. 1367PulheimNorth Rhine-Westphalia, Germany 1%2 of 236
  68. 1368SquamishBritish Columbia, Canada 1%2 of 239
  69. 1369Les AbymesGuadeloupe, Guadeloupe 1%2 of 241
  70. 1370QuesnelBritish Columbia, Canada 1%2 of 241
  71. 1371KentWashington, United States 1%2 of 242
  72. 1372ThièsThies, Senegal 1%2 of 246
  73. 1373Trappenkamplast full day 10 OctSchleswig-Holstein, Germany 1%2 of 249
  74. 1374Mount Ivylast full day 11 OctNew York, United States 1%2 of 249
  75. 1375TallahasseeFlorida, United States 1%2 of 250
  76. 1376FunzaCundinamarca, Colombia 1%2 of 251
  77. 1377Santiago de Querétarolast full day 11 OctQuerétaro, Mexico 1%2 of 255
  78. 1378PesqueríaNuevo León, Mexico 1%2 of 257
  79. 1379Tarplast full day 10 OctSchleswig-Holstein, Germany 1%2 of 257
  80. 1380La VistaNebraska, United States 1%2 of 257
  81. 1381Ciudad General EscobedoNuevo León, Mexico 1%2 of 258
  82. =1382South LaurelMaryland, United States 1%2 of 259
  83. =1382AnthonyNew Mexico, United States 1%2 of 259
  84. 1384LimaOhio, United States 1%2 of 260
  85. 1385ThionvilleGrand Est, France 1%2 of 260
  86. 1386Prince AlbertSaskatchewan, Canada 1%2 of 260
  87. 1387Coffs HarbourNew South Wales, Australia 1%2 of 260
  88. 1388McMinnvilleOregon, United States 1%2 of 260
  89. 1389Heroica MatamorosTamaulipas, Mexico 1%2 of 261
  90. 1390Le RobertMartinique, Martinique 1%2 of 261
  91. 1391TacomaWashington, United States 1%2 of 262
  92. 1392HiwasauraTokushima, Japan 1%2 of 264
  93. 1393NorthamptonEngland, United Kingdom 1%2 of 264
  94. 1394KreuzlingenThurgau, Switzerland 1%2 of 264
  95. 1395MetzGrand Est, France 1%2 of 264
  96. 1396HarrisonburgVirginia, United States 1%2 of 264
  97. 1397RockvilleMaryland, United States 1%2 of 264
  98. =1398CasertaCampania, Italy 1%2 of 265
  99. =1398SoachaCundinamarca, Colombia 1%2 of 265
  100. 1400VenrayLimburg, The Netherlands 1%2 of 265

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), 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).