SmogRank / World / United States / California / November 2024

Most unhealthy days in California, United States, November 2024

119 cities in California, United States ranked by their share of unhealthy days over the 30 days. The most unhealthy days: El Rio, United States, 2 of 29 measured days. 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.

← El Rio 7% 6%0
Every city in California, United States ranked for November 2024, 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. 1El Rio
    2 of 29
  2. 2Calexico
    2 of 30
  3. 3Truckee
    1 of 28
  4. 4Ukiah
    1 of 29
  5. 5Compton
    1 of 30
  6. 6Bakersfield
    1 of 30
  7. 7Stockton
    1 of 30
  8. 8Visalia
    0 of 30
  9. 9Imperial Beach
    0 of 30
  10. 10Hanford
    0 of 30
  11. 11Jurupa Valley
    0 of 30
  12. 12Fresno
    0 of 30
  13. 13Corcoran
    0 of 29
  14. 13Hawthornelow-cost sensors
    0 of 30
  15. 15Carsonlow-cost sensors
    0 of 30
  16. 16Clovis
    0 of 30
  17. 16Los Angeles
    0 of 30
  18. 18Anaheim
    0 of 26
  19. 19Porterville
    0 of 29
  20. 19Santa Barbara
    0 of 30
  21. 19Woodland
    0 of 30
  22. 22Long Beach
    0 of 24
  23. 23Torrancelow-cost sensors
    0 of 30
  24. 24Inglewoodlow-cost sensors
    0 of 30
  25. 24Turlock
    0 of 30
  26. 26Florinlow-cost sensors
    0 of 30
  27. 27Burbank
    0 of 30
  28. 27Modesto
    0 of 30
  29. 27Riverside
    0 of 30
  30. 30Manteca
    0 of 30
  31. 30Arden-Arcade
    0 of 27
  32. 30Rio Vista
    0 of 28
  33. 33Madera
    0 of 30
  34. 34Fontana
    0 of 30
  35. 35Chico
    0 of 30
  36. 36Merced
    0 of 30
  37. 36Sacramento
    0 of 30
  38. 38Roseville
    0 of 30
  39. 39San Diego
    0 of 30
  40. 39Santa Clarita
    0 of 30
  41. 41Lomitalow-cost sensors
    0 of 30
  42. 42Ben Lomond
    0 of 30
  43. 42Chula Vista
    0 of 30
  44. 42San Jose
    0 of 30
  45. 45Victorville
    0 of 29
  46. 46Atascadero
    0 of 30
  47. 46Yuba City
    0 of 30
  48. 48Santa Monicalow-cost sensors
    0 of 30
  49. 49Richmond
    0 of 30
  50. 50El Cajon
    0 of 30
  51. 51Hollister
    0 of 29
  52. 51Oceanside
    0 of 27
  53. 53Berkeley
    0 of 24
  54. 54Gridley
    0 of 30
  55. 54Lompoc
    0 of 26
  56. 54Santa Paula
    0 of 30
  57. 57Guadalupe
    0 of 30
  58. 57Willows
    0 of 26
  59. 59El Centro
    0 of 29
  60. 59Indio
    0 of 28
  61. 61Martinez
    0 of 23
  62. 62Livermore
    0 of 29
  63. 62Orcutt
    0 of 30
  64. 64Redding
    0 of 30
  65. 65Agouralow-cost sensors
    0 of 30
  66. 65La Crescenta-Montroselow-cost sensors
    0 of 30
  67. 67Colusa
    0 of 27
  68. 68Brawley
    0 of 29
  69. 68Goletalow-cost sensors
    0 of 30
  70. 68Huron
    0 of 29
  71. 71Vacaville
    0 of 30
  72. 71Watsonvillelow-cost sensors
    0 of 30
  73. 73Yreka
    0 of 30
  74. 74Crestline
    0 of 29
  75. 74Oakland
    0 of 30
  76. 76Prunedalelow-cost sensors
    0 of 30
  77. 77Oceano
    0 of 30
  78. 77Rancho Murieta
    0 of 29
  79. 77San Luis Obispo
    0 of 30
  80. 80Folsom
    0 of 30
  81. 80Galt
    0 of 30
  82. 80Lake Elsinore
    0 of 29
  83. 80Poway
    0 of 29
  84. 84Red Bluff
    0 of 30
  85. 85Live Oaklow-cost sensors
    0 of 30
  86. 85South Lake Tahoe
    0 of 30
  87. 87North Auburn
    0 of 25
  88. 88Salinas
    0 of 30
  89. 88Santa Cruz
    0 of 30
  90. 88Tracy
    0 of 30
  91. 91Lancaster
    0 of 30
  92. 91Seasidelow-cost sensors
    0 of 29
  93. 93King City
    0 of 30
  94. 93Lincoln
    0 of 29
  95. 95Davis
    0 of 29
  96. 95Gilroy
    0 of 26
  97. 95Simi Valley
    0 of 29
  98. 98Banning
    0 of 30
  99. 98Ojai
    0 of 30
  100. 98Palo Altolow-cost sensors
    0 of 30
  101. 98Sebastopol
    0 of 29
  102. 102Thousand Oaks
    0 of 30
  103. 103Glendora
    0 of 29
  104. 103Grass Valley
    0 of 30
  105. 105Alta Sierra
    0 of 30
  106. 105Carpinteria
    0 of 30
  107. 105San Leandro
    0 of 30
  108. 105Temecula
    0 of 23
  109. 109San Francisco
    0 of 23
  110. 110Pleasanton
    0 of 30
  111. 110Sunnyvalelow-cost sensors
    0 of 30
  112. 112San Rafael
    0 of 29
  113. 113Fillmore
    0 of 27
  114. 113Alpine
    0 of 29
  115. 115Solvang
    0 of 28
  116. 116Redwood City
    0 of 23
  117. 117Concord
    0 of 28
  118. 118Ridgecrest
    0 of 30
  119. 119Paradise
    0 of 29

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 2024 · All cities in United States, November 2024 · California now

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SmogRank, most polluted cities in California, United States, by unhealthy days, PM2.5, November 2024, smogrank.com/us/region/california/history/2024-11?by=days (accessed 7 Oct 2026).

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