SmogRank / World / United States / California / February 2026

Most polluted cities in California, United States, February 2026

121 cities in California, United States ranked by their average PM2.5 over the 28 days. Worst: Tulare at 23.8 µg/m³, #428 of 2,841 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 32% 30%0
Every city in California, United States ranked for February 2026, 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
    32%
  2. 2Delanolow-cost sensors
    25%
  3. 3Bakersfield
    14%
  4. 4Modesto
    14%
  5. 5Visalia
    7%
  6. 6Fremontlow-cost sensors
    4%
  7. 7Mammoth Lakes
    4%
  8. 8Fresno
    4%
  9. 9Hanford
    4%
  10. 10Imperial Beach
    0%
  11. 11Corcoran
    0%
  12. 12Jurupa Valley
    0%
  13. 13Calexico
    0%
  14. 14Madera
    0%
  15. 15Turlock
    0%
  16. 16Merced
    0%
  17. 17Whittier
    0%
  18. 18Compton
    0%
  19. 18Florinlow-cost sensors
    0%
  20. 20Clovis
    0%
  21. 20Riverside
    0%
  22. 22Porterville
    0%
  23. 23Stockton
    0%
  24. 24Hawthornelow-cost sensors
    0%
  25. 25Anaheim
    0%
  26. 26Manteca
    0%
  27. 27Los Angeles
    0%
  28. 27Arden-Arcade
    0%
  29. 29Woodland
    0%
  30. 30Big Bear City
    0%
  31. 30Inglewoodlow-cost sensors
    0%
  32. 30Long Beach
    0%
  33. 33Carsonlow-cost sensors
    0%
  34. 34Roseville
    0%
  35. 34Sacramento
    0%
  36. 36Fontana
    0%
  37. 36San Diego
    0%
  38. 38Alta Sierra
    0%
  39. 39Lincoln
    0%
  40. 39Oakland
    0%
  41. 39Torrancelow-cost sensors
    0%
  42. 39Yuba City
    0%
  43. 43Chico
    0%
  44. 44Gridley
    0%
  45. 44San Jose
    0%
  46. 46Yreka
    0%
  47. 47Richmond
    0%
  48. 48Chula Vista
    0%
  49. 48San Francisco
    0%
  50. 50Mission Viejo
    0%
  51. 51Ukiah
    0%
  52. 52Burbank
    0%
  53. 52Oceanside
    0%
  54. 52Redding
    0%
  55. 55Santa Monicalow-cost sensors
    0%
  56. 56Rancho Murieta
    0%
  57. 56San Leandro
    0%
  58. 56San Luis Obispo
    0%
  59. 59El Cajon
    0%
  60. 59Lomitalow-cost sensors
    0%
  61. 61North Auburn
    0%
  62. 61Vallejo
    0%
  63. 63Galt
    0%
  64. 63Livermore
    0%
  65. 65Huron
    0%
  66. 65Santa Barbara
    0%
  67. 67Palo Altolow-cost sensors
    0%
  68. 68Berkeley
    0%
  69. 68Poway
    0%
  70. 68South San Franciscolow-cost sensors
    0%
  71. 71Davis
    0%
  72. 71Crescent City
    0%
  73. 73Sunnyvalelow-cost sensors
    0%
  74. 74Colusa
    0%
  75. 74Pleasanton
    0%
  76. 74Tracy
    0%
  77. 77Agouralow-cost sensors
    0%
  78. 77Santa Cruz
    0%
  79. 79Guadalupe
    0%
  80. 79Santa Clarita
    0%
  81. 81Atascadero
    0%
  82. 81Brawley
    0%
  83. 81Red Bluff
    0%
  84. 84El Centro
    0%
  85. 84Redwood City
    0%
  86. 86Lake Elsinore
    0%
  87. 86Sebastopol
    0%
  88. 88Concord
    0%
  89. 88Glendora
    0%
  90. 90Crestline
    0%
  91. 90Indio
    0%
  92. 90Simi Valley
    0%
  93. 90Vacaville
    0%
  94. 94Carpinteria
    0%
  95. 94Gilroy
    0%
  96. 96Folsom
    0%
  97. 96Willows
    0%
  98. 96La Crescenta-Montroselow-cost sensors
    0%
  99. 99Ben Lomond
    0%
  100. 100Oceano
    0%
  101. 100Paradise
    0%
  102. 100Thousand Oaks
    0%
  103. 103El Rio
    0%
  104. 103Salinas
    0%
  105. 103San Rafael
    0%
  106. 103Windsorlow-cost sensors
    0%
  107. 107Seasidelow-cost sensors
    0%
  108. 108Alpine
    0%
  109. 108Orcutt
    0%
  110. 110Banning
    0%
  111. 111Lancaster
    0%
  112. 111Martinez
    0%
  113. 113Ojai
    0%
  114. 114Fillmore
    0%
  115. 114King City
    0%
  116. 116Hollister
    0%
  117. 116Truckee
    0%
  118. 118Goletalow-cost sensors
    0%
  119. 119Solvang
    0%
  120. 120Ridgecrest
    0%
  121. 121Lompoc
    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 2026 · All cities in United States, February 2026 · California now

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SmogRank, most polluted cities in California, United States, PM2.5, February 2026, smogrank.com/us/region/california/history/2026-02 (accessed 7 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.