SmogRank / World / United States / California / June 2026

Most polluted cities in California, United States, June 2026

113 cities in California, United States ranked by their average PM2.5 over the 30 days. Worst: Jurupa Valley at 14.1 µg/m³, #375 of 2,466 cities in the world. Cleanest: Sunnyvale 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.

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

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SmogRank, most polluted cities in California, United States, PM2.5, June 2026, smogrank.com/us/region/california/history/2026-06 (accessed 6 Oct 2026).

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