SmogRank / World / United States / California / February 2025

Most polluted cities in California, United States, February 2025

115 cities in California, United States ranked by their average PM2.5 over the 28 days. Worst: Imperial Beach at 16.5 µg/m³, #791 of 2,574 cities in the world. Cleanest: Ridgecrest at 2.4. 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.

← Jurupa Valley 7% 7%0
Every city in California, United States ranked for February 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. 1Jurupa Valley
    7%
  2. 2Imperial Beach
    0%
  3. 3Hawthornelow-cost sensors
    0%
  4. 4Calexico
    0%
  5. 5Burbank
    0%
  6. 5Carsonlow-cost sensors
    0%
  7. 7Compton
    0%
  8. 8Hanford
    0%
  9. 9Los Angeles
    0%
  10. 10Chico
    0%
  11. 11Fontana
    0%
  12. 11San Diego
    0%
  13. 13Anaheim
    0%
  14. 13Inglewoodlow-cost sensors
    0%
  15. 15Torrancelow-cost sensors
    0%
  16. 16Riverside
    0%
  17. 17Corcoran
    0%
  18. 17Fresno
    0%
  19. 17Santa Monicalow-cost sensors
    0%
  20. 20Chula Vista
    0%
  21. 20Visalia
    0%
  22. 22Santa Barbara
    0%
  23. 23Bakersfield
    0%
  24. 24Long Beach
    0%
  25. 25Clovis
    0%
  26. 26Porterville
    0%
  27. 27El Cajon
    0%
  28. 27Lomitalow-cost sensors
    0%
  29. 29Berkeley
    0%
  30. 30Guadalupe
    0%
  31. 30Oceanside
    0%
  32. 32Stockton
    0%
  33. 33Poway
    0%
  34. 33Ukiah
    0%
  35. 35Yreka
    0%
  36. 35Arden-Arcade
    0%
  37. 37Turlock
    0%
  38. 37Woodland
    0%
  39. 39Santa Clarita
    0%
  40. 39Crescent City
    0%
  41. 41Florinlow-cost sensors
    0%
  42. 41San Jose
    0%
  43. 43Glendora
    0%
  44. 44Madera
    0%
  45. 44Roseville
    0%
  46. 46Modesto
    0%
  47. 47Atascadero
    0%
  48. 48Manteca
    0%
  49. 49Merced
    0%
  50. 49Oceano
    0%
  51. 51Oakland
    0%
  52. 52South Lake Tahoe
    0%
  53. 53Brawley
    0%
  54. 53Sacramento
    0%
  55. 55Agouralow-cost sensors
    0%
  56. 55Martinez
    0%
  57. 57Galt
    0%
  58. 57La Crescenta-Montroselow-cost sensors
    0%
  59. 59Lincoln
    0%
  60. 60Livermore
    0%
  61. 60Victorville
    0%
  62. 60Yuba City
    0%
  63. 63Alta Sierra
    0%
  64. 64Indio
    0%
  65. 64Lake Elsinore
    0%
  66. 66El Rio
    0%
  67. 66Folsom
    0%
  68. 66Lompoc
    0%
  69. 66San Francisco
    0%
  70. 70Ben Lomond
    0%
  71. 70Rancho Murieta
    0%
  72. 70Salinas
    0%
  73. 70Vallejo
    0%
  74. 74South San Franciscolow-cost sensors
    0%
  75. 75El Centro
    0%
  76. 76Crestline
    0%
  77. 76Gridley
    0%
  78. 78Santa Cruz
    0%
  79. 79Tracy
    0%
  80. 80Banning
    0%
  81. 80Goletalow-cost sensors
    0%
  82. 80Sebastopol
    0%
  83. 80Simi Valley
    0%
  84. 80Solvang
    0%
  85. 85Alpine
    0%
  86. 85Davis
    0%
  87. 85Temecula
    0%
  88. 88Vacaville
    0%
  89. 89Gilroy
    0%
  90. 89Grass Valley
    0%
  91. 89Huron
    0%
  92. 89Willows
    0%
  93. 93Redwood City
    0%
  94. 93San Luis Obispo
    0%
  95. 93Red Bluff
    0%
  96. 93Redding
    0%
  97. 97King City
    0%
  98. 97Pleasanton
    0%
  99. 97San Leandro
    0%
  100. 97San Rafael
    0%
  101. 101Carpinteria
    0%
  102. 102Thousand Oaks
    0%
  103. 103North Auburn
    0%
  104. 104Orcutt
    0%
  105. 104Windsorlow-cost sensors
    0%
  106. 106Paradise
    0%
  107. 107Colusa
    0%
  108. 107Hollister
    0%
  109. 107Ojai
    0%
  110. 110Fillmore
    0%
  111. 111Lancaster
    0%
  112. 111Sunnyvalelow-cost sensors
    0%
  113. 113Concord
    0%
  114. 114Truckee
    0%
  115. 115Ridgecrest
    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, February 2025 · All cities in United States, February 2025 · California now

Use this board

SmogRank, most polluted cities in California, United States, PM2.5, February 2025, smogrank.com/us/region/california/history/2025-02 (accessed 6 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.