SmogRank / World / United States / California / November 2023

Most polluted cities in California, United States, November 2023

104 cities in California, United States ranked by their average PM2.5 over the 30 days. Worst: Hanford at 19.7 µg/m³, #74 of 2,194 cities in the world. Cleanest: Solvang at 2.9. A city needs measurements on 70% of the days to be ranked.

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. Ties go to the higher average.

← Hanford 7% 6%0
Every city in California, United States ranked for November 2023, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1Hanford
    7%
  2. 2Corcoran
    3%
  3. 3Imperial Beach
    3%
  4. 4Fresno
    0%
  5. 5Bakersfield
    0%
  6. 6Visalia
    0%
  7. 7Stockton
    0%
  8. 8Turlock
    0%
  9. 9Arden-Arcade
    0%
  10. 10Modesto
    0%
  11. 11Compton
    0%
  12. 12Merced
    0%
  13. 13Rio Vista
    0%
  14. 14Chico
    0%
  15. 15Clovis
    0%
  16. 15Gridley
    0%
  17. 17Manteca
    0%
  18. 17Sacramento
    0%
  19. 19Madera
    0%
  20. 20Yuba City
    0%
  21. 21Hawthornelow-cost sensors
    0%
  22. 21Jurupa Valley
    0%
  23. 23Woodland
    0%
  24. 24Anaheim
    0%
  25. 25Carsonlow-cost sensors
    0%
  26. 25Richmond
    0%
  27. 27Long Beach
    0%
  28. 28Fontana
    0%
  29. 29Redwood City
    0%
  30. 30San Jose
    0%
  31. 31Colusa
    0%
  32. 32Big Bear City
    0%
  33. 32Oakland
    0%
  34. 32Yreka
    0%
  35. 35Riverside
    0%
  36. 35Torrancelow-cost sensors
    0%
  37. 37Porterville
    0%
  38. 38Los Angeles
    0%
  39. 39Burbank
    0%
  40. 39Calexico
    0%
  41. 41Ukiah
    0%
  42. 42Roseville
    0%
  43. 43Chula Vista
    0%
  44. 44Inglewoodlow-cost sensors
    0%
  45. 45North Auburn
    0%
  46. 46San Diego
    0%
  47. 46Victorville
    0%
  48. 48El Cajon
    0%
  49. 49Galt
    0%
  50. 50Pleasanton
    0%
  51. 50Rancho Murieta
    0%
  52. 50San Francisco
    0%
  53. 53Lincoln
    0%
  54. 54Huron
    0%
  55. 54Salinas
    0%
  56. 54San Leandro
    0%
  57. 54Willows
    0%
  58. 58Oceanside
    0%
  59. 59Redding
    0%
  60. 60Lomitalow-cost sensors
    0%
  61. 61Oceano
    0%
  62. 61Santa Monicalow-cost sensors
    0%
  63. 63Brawley
    0%
  64. 63Davis
    0%
  65. 63Santa Clarita
    0%
  66. 66Alta Sierra
    0%
  67. 67Truckee
    0%
  68. 68Agouralow-cost sensors
    0%
  69. 68Ben Lomond
    0%
  70. 70Concord
    0%
  71. 70Crestline
    0%
  72. 72La Crescenta-Montroselow-cost sensors
    0%
  73. 73Banning
    0%
  74. 73Santa Barbara
    0%
  75. 73Vacaville
    0%
  76. 76San Rafael
    0%
  77. 77El Centro
    0%
  78. 78Crescent City
    0%
  79. 79Sebastopol
    0%
  80. 80Poway
    0%
  81. 81Orcutt
    0%
  82. 81Thousand Oaks
    0%
  83. 83Glendora
    0%
  84. 83Lake Elsinore
    0%
  85. 85Atascadero
    0%
  86. 86Grass Valley
    0%
  87. 87Paradise
    0%
  88. 87Red Bluff
    0%
  89. 89San Luis Obispo
    0%
  90. 89Tracy
    0%
  91. 91Santa Cruz
    0%
  92. 92Simi Valley
    0%
  93. 93South Lake Tahoe
    0%
  94. 94Fillmore
    0%
  95. 95Guadalupe
    0%
  96. 95Lompoc
    0%
  97. 97Carpinteria
    0%
  98. 97Ojai
    0%
  99. 99Gilroy
    0%
  100. 99Hollister
    0%
  101. 101Alpine
    0%
  102. 102Lancaster
    0%
  103. 103King City
    0%
  104. 104Solvang
    0%

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
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

All cities in the world, November 2023 · All cities in United States, November 2023 · California now

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SmogRank, most polluted cities in California, United States, PM2.5, November 2023, smogrank.com/us/region/california/history/2023-11 (accessed 6 Oct 2026).

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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.