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. 1401HirosakiAomori, Japan 1%2 of 266
  2. 1402South VinelandNew Jersey, United States 1%2 of 266
  3. 1403Fort St. JohnBritish Columbia, Canada 1%2 of 266
  4. 1404BailénAndalusia, Spain 1%2 of 267
  5. 1405Leobenlast full day 24 SeptStyria, Austria 1%2 of 267
  6. 1406New HavenConnecticut, United States 1%2 of 267
  7. 1407CorvallisOregon, United States 1%2 of 267
  8. 1408ReginaSaskatchewan, Canada 1%2 of 268
  9. 1409AricaArica y Parinacota Region, Chile 1%2 of 269
  10. 1410Pocatellolast full day 8 OctIdaho, United States 1%2 of 269
  11. 1411PeterboroughOntario, Canada 1%2 of 270
  12. 1412HillsboroOregon, United States 1%2 of 270
  13. 1413AspenColorado, United States 1%2 of 270
  14. 1414Ciudad ApodacaNuevo León, Mexico 1%2 of 272
  15. 1415ToledoCastille-La Mancha, Spain 1%2 of 272
  16. 1416Dodong-riGyeongsangbuk-do, South Korea 1%2 of 272
  17. 1417Lübecklast full day 10 OctSchleswig-Holstein, Germany 1%2 of 272
  18. 1418Albanylast full day 11 OctNew York, United States 1%2 of 272
  19. 1419Borgo ValsuganaTrentino-Alto Adige, Italy 1%2 of 273
  20. 1420RostusaMavrovo and Rostuša, North Macedonia 1%2 of 273
  21. 1421ChampaignIllinois, United States 1%2 of 273
  22. 1422Malmölast full day 11 OctSkåne, Sweden 1%2 of 273
  23. 1423White Plainslast full day 11 OctNew York, United States 1%2 of 273
  24. 1424HamoisWallonia, Belgium 1%2 of 273
  25. 1425HersheyPennsylvania, United States 1%2 of 274
  26. 1426NoordwijkerhoutSouth Holland, The Netherlands 1%2 of 274
  27. 1427Mönchengladbachlast full day 10 OctNorth Rhine-Westphalia, Germany 1%2 of 274
  28. 1428MarmandeNew Aquitaine, France 1%2 of 274
  29. 1429GraysEngland, United Kingdom 1%2 of 274
  30. 1430HeerlenLimburg, The Netherlands 1%2 of 274
  31. 1431Hunt ValleyMaryland, United States 1%2 of 275
  32. 1432Esch-sur-AlzetteEsch-sur-Alzette, Luxembourg 1%2 of 275
  33. 1433Oxon Hill-GlassmanorMaryland, United States 1%2 of 275
  34. 1434GibsonsBritish Columbia, Canada 1%2 of 275
  35. 1435TalentOregon, United States 1%2 of 275
  36. =1436JonageAuvergne-Rhône-Alpes, France 1%2 of 276
  37. =1436AshburnVirginia, United States 1%2 of 276
  38. 1438ShakopeeMinnesota, United States 1%2 of 276
  39. 1439Southend-on-SeaEngland, United Kingdom 1%2 of 276
  40. 1440Saint CloudMinnesota, United States 1%2 of 276
  41. 1441YuanlinTaiwan, Taiwan 1%2 of 277
  42. 1442ZhongliaoTaiwan, Taiwan 1%2 of 277
  43. 1443Koblenzlast full day 10 OctRheinland-Pfalz, Germany 1%2 of 277
  44. 1444ScaggsvilleMaryland, United States 1%2 of 277
  45. 1445Helena Valley West CentralMontana, United States 1%2 of 277
  46. 1446KingstonOntario, Canada 1%2 of 277
  47. 1447BellevueNebraska, United States 1%2 of 277
  48. 1448Cañon CityColorado, United States 1%2 of 277
  49. 1449MilwaukieOregon, United States 1%2 of 277
  50. 1450BellevueWashington, United States 1%2 of 277
  51. 1451TogitsuNagasaki, Japan 1%2 of 278
  52. 1452PeoriaIllinois, United States 1%2 of 278
  53. =1453Fort-de-FranceMartinique, Martinique 1%2 of 278
  54. =1453SpringfieldVirginia, United States 1%2 of 278
  55. 1455Val-de-ReuilNormandy, France 1%2 of 278
  56. 1456Kahlalast full day 10 OctThuringia, Germany 1%2 of 278
  57. 1457CambridgeMaryland, United States 1%2 of 278
  58. 1458SaseboNagasaki, Japan 1%2 of 279
  59. 1459Kansas CityKansas, United States 1%2 of 279
  60. 1460Elsenfeldlast full day 10 OctBavaria, Germany 1%2 of 279
  61. 1461CharlottesvilleVirginia, United States 1%2 of 279
  62. 1462West JordanUtah, United States 1%2 of 279
  63. 1463SeafordDelaware, United States 1%2 of 279
  64. 1464Idaho FallsIdaho, United States 1%2 of 279
  65. 1465ChaozhouTaiwan, Taiwan 1%2 of 280
  66. 1466Jurupa ValleyCalifornia, United States 1%2 of 280
  67. 1467MiamiOklahoma, United States 1%2 of 280
  68. 1468BogotáBogota D.C., Colombia 1%2 of 280
  69. =1469Würzburglast full day 10 OctBavaria, Germany 1%2 of 280
  70. =1469Nuremberglast full day 10 OctBavaria, Germany 1%2 of 280
  71. 1471Moundsvillelast full day 10 OctWest Virginia, United States 1%2 of 280
  72. 1472DammeFlanders, Belgium 1%2 of 280
  73. 1473MontbéliardBourgogne-Franche-Comté, France 1%2 of 280
  74. =1474ZürichZurich, Switzerland 1%2 of 280
  75. =1474WetzlarHesse, Germany 1%2 of 280
  76. =1474Niederzierlast full day 10 OctNorth Rhine-Westphalia, Germany 1%2 of 280
  77. 1477Soestlast full day 10 OctNorth Rhine-Westphalia, Germany 1%2 of 280
  78. 1478AllentownPennsylvania, United States 1%2 of 280
  79. 1479OmahaNebraska, United States 1%2 of 280
  80. 1480Sept-ÎlesQuebec, Canada 1%2 of 280
  81. 1481Kan’onjichōKagawa, Japan 1%2 of 281
  82. 1482TimaruCanterbury, New Zealand 1%2 of 281
  83. 1483Ratingenlast full day 10 OctNorth Rhine-Westphalia, Germany 1%2 of 281
  84. =1484Uslarlast full day 10 OctLower Saxony, Germany 1%2 of 281
  85. =1484les EscaldesEscaldes-Engordany, Andorra 1%2 of 281
  86. 1486HitaOita, Japan 1%2 of 282
  87. 1487Krefeldlast full day 10 OctNorth Rhine-Westphalia, Germany 1%2 of 282
  88. 1488Düsseldorflast full day 10 OctNorth Rhine-Westphalia, Germany 1%2 of 282
  89. =1489Kölnlast full day 10 OctNorth Rhine-Westphalia, Germany 1%2 of 282
  90. =1489GießenHesse, Germany 1%2 of 282
  91. 1491Wuppertallast full day 10 OctNorth Rhine-Westphalia, Germany 1%2 of 282
  92. 1492Leverkusenlast full day 10 OctNorth Rhine-Westphalia, Germany 1%2 of 282
  93. 1493Bonnlast full day 10 OctNorth Rhine-Westphalia, Germany 1%2 of 282
  94. =1494Sinnersdorflast full day 10 OctNorth Rhine-Westphalia, Germany 1%2 of 282
  95. =1494Hattingenlast full day 10 OctNorth Rhine-Westphalia, Germany 1%2 of 282
  96. 1496CreilHauts-de-France, France 1%2 of 282
  97. 1497GingelomFlanders, Belgium 1%2 of 282
  98. 1498TitzNorth Rhine-Westphalia, Germany 1%2 of 283
  99. 1499LormontNew Aquitaine, France 1%2 of 283
  100. 1500SpringfieldIllinois, United States 1%2 of 283

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), 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).