SmogRank / World / United States / California / November 2025

Most polluted cities in California, United States, November 2025

100 cities in California, United States ranked by their average PM2.5 over the 30 days. Worst: Tulare at 24.9 µg/m³, #298 of 2,662 cities in the world. Cleanest: Lompoc at 2.0. 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.

← Tulare 30% 20%0
Every city in California, United States ranked for November 2025, 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. 1Tularelow-cost sensors
    30%
  2. 2Delanolow-cost sensors
    20%
  3. 3Jurupa Valley
    4%
  4. 4Riverside
    4%
  5. 5Santa Monicalow-cost sensors
    3%
  6. 6Palo Altolow-cost sensors
    3%
  7. 7Bakersfield
    0%
  8. 8Imperial Beach
    0%
  9. 9Fresno
    0%
  10. 10Hanford
    0%
  11. 11Compton
    0%
  12. 12Hawthornelow-cost sensors
    0%
  13. 13Fontana
    0%
  14. 14Carsonlow-cost sensors
    0%
  15. 15Inglewoodlow-cost sensors
    0%
  16. 16Los Angeles
    0%
  17. 17Anaheim
    0%
  18. 18Madera
    0%
  19. 19Long Beach
    0%
  20. 19Torrancelow-cost sensors
    0%
  21. 21Porterville
    0%
  22. 22Merced
    0%
  23. 22San Diego
    0%
  24. 24Turlock
    0%
  25. 25Fremontlow-cost sensors
    0%
  26. 26Lomitalow-cost sensors
    0%
  27. 27San Jose
    0%
  28. 28Burbank
    0%
  29. 29Manteca
    0%
  30. 30Florinlow-cost sensors
    0%
  31. 31Woodland
    0%
  32. 32Clovis
    0%
  33. 32Richmond
    0%
  34. 34Yreka
    0%
  35. 35Oakland
    0%
  36. 36Glendora
    0%
  37. 37Chula Vista
    0%
  38. 38El Cajon
    0%
  39. 38Mission Viejo
    0%
  40. 38Arden-Arcade
    0%
  41. 41Agouralow-cost sensors
    0%
  42. 41Alta Sierra
    0%
  43. 41Victorville
    0%
  44. 44Chico
    0%
  45. 44Lincoln
    0%
  46. 44Sacramento
    0%
  47. 44South San Franciscolow-cost sensors
    0%
  48. 48Crescent City
    0%
  49. 49Lake Elsinore
    0%
  50. 49Martinez
    0%
  51. 51Ukiah
    0%
  52. 52Oceanside
    0%
  53. 53El Rio
    0%
  54. 53Huron
    0%
  55. 55Redwood City
    0%
  56. 56Redding
    0%
  57. 57North Auburn
    0%
  58. 57Sunnyvalelow-cost sensors
    0%
  59. 57Vacaville
    0%
  60. 60Goletalow-cost sensors
    0%
  61. 60Poway
    0%
  62. 60Santa Clarita
    0%
  63. 63Galt
    0%
  64. 64Rancho Murieta
    0%
  65. 65Davis
    0%
  66. 65Simi Valley
    0%
  67. 67Indio
    0%
  68. 67Santa Barbara
    0%
  69. 69Brawley
    0%
  70. 70Livermore
    0%
  71. 71Folsom
    0%
  72. 72Crestline
    0%
  73. 72El Centro
    0%
  74. 72La Crescenta-Montroselow-cost sensors
    0%
  75. 75San Rafael
    0%
  76. 76Thousand Oaks
    0%
  77. 77Tracy
    0%
  78. 78Ojai
    0%
  79. 79Santa Cruz
    0%
  80. 80Seasidelow-cost sensors
    0%
  81. 81San Luis Obispo
    0%
  82. 81Temecula
    0%
  83. 83Atascadero
    0%
  84. 83Carpinteria
    0%
  85. 85Windsorlow-cost sensors
    0%
  86. 86Salinas
    0%
  87. 87Banning
    0%
  88. 87Guadalupe
    0%
  89. 89Oceano
    0%
  90. 90Alpine
    0%
  91. 91Fillmore
    0%
  92. 92Truckee
    0%
  93. 93Hollister
    0%
  94. 94Ben Lomond
    0%
  95. 95King City
    0%
  96. 96Lancaster
    0%
  97. 97Orcutt
    0%
  98. 98Solvang
    0%
  99. 99Ridgecrest
    0%
  100. 100Lompoc
    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 2025 · All cities in United States, November 2025 · California now

Use this board

SmogRank, most polluted cities in California, United States, PM2.5, November 2025, smogrank.com/us/region/california/history/2025-11 (accessed 7 Oct 2026).

Download top 10 (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.