SmogRank / World / United States / California / June 2024

Most polluted cities in California, United States, June 2024

107 cities in California, United States ranked by their average PM2.5 over the 30 days. Worst: Fontana at 15.6 µg/m³, #171 of 2,517 cities in the world. Cleanest: Florin at 2.6. 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 0% 0.75%0
Every city in California, United States ranked for June 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. 1Fontana
    0%
  2. 2Los Angeles
    0%
  3. 3Santa Clarita
    0%
  4. 4Jurupa Valley
    0%
  5. 5Richmond
    0%
  6. 5La Crescenta-Montroselow-cost sensors
    0%
  7. 7Visalia
    0%
  8. 8Riverside
    0%
  9. 9Burbank
    0%
  10. 10Glendora
    0%
  11. 11Berkeley
    0%
  12. 11Brawley
    0%
  13. 13Indio
    0%
  14. 14Rio Vista
    0%
  15. 15Imperial Beach
    0%
  16. 16El Centro
    0%
  17. 17Bakersfield
    0%
  18. 18Banning
    0%
  19. 19Victorville
    0%
  20. 20Agouralow-cost sensors
    0%
  21. 20Clovis
    0%
  22. 22Porterville
    0%
  23. 23Chula Vista
    0%
  24. 23San Jose
    0%
  25. 25Alpine
    0%
  26. 26El Cajon
    0%
  27. 26Fresno
    0%
  28. 26Lake Elsinore
    0%
  29. 26Poway
    0%
  30. 30Anaheim
    0%
  31. 30Simi Valley
    0%
  32. 32Compton
    0%
  33. 32Hanford
    0%
  34. 32Santa Monicalow-cost sensors
    0%
  35. 35Inglewoodlow-cost sensors
    0%
  36. 36Hollister
    0%
  37. 36Oakland
    0%
  38. 36San Diego
    0%
  39. 39Fillmore
    0%
  40. 39Carsonlow-cost sensors
    0%
  41. 39Hawthornelow-cost sensors
    0%
  42. 42Yuba City
    0%
  43. 43Modesto
    0%
  44. 43Woodland
    0%
  45. 45King City
    0%
  46. 45Torrancelow-cost sensors
    0%
  47. 47Madera
    0%
  48. 48Calexico
    0%
  49. 48Salinas
    0%
  50. 50Crestline
    0%
  51. 50San Francisco
    0%
  52. 50Stockton
    0%
  53. 50Turlock
    0%
  54. 54Roseville
    0%
  55. 54San Leandro
    0%
  56. 56Oceano
    0%
  57. 56Santa Cruz
    0%
  58. 56Thousand Oaks
    0%
  59. 59Lomitalow-cost sensors
    0%
  60. 60Galt
    0%
  61. 61Oceanside
    0%
  62. 61San Rafael
    0%
  63. 63Corcoran
    0%
  64. 63Long Beach
    0%
  65. 63Arden-Arcade
    0%
  66. 66Guadalupe
    0%
  67. 66Manteca
    0%
  68. 66Sacramento
    0%
  69. 69Ukiah
    0%
  70. 70Ben Lomond
    0%
  71. 70Gridley
    0%
  72. 70Huron
    0%
  73. 73Orcutt
    0%
  74. 74Folsom
    0%
  75. 74Pleasanton
    0%
  76. 76Ojai
    0%
  77. 77Carpinteria
    0%
  78. 77Santa Barbara
    0%
  79. 79Redwood City
    0%
  80. 80Chico
    0%
  81. 81Colusa
    0%
  82. 81Davis
    0%
  83. 81Red Bluff
    0%
  84. 84Merced
    0%
  85. 84Tracy
    0%
  86. 84Willows
    0%
  87. 87Lancaster
    0%
  88. 88Alta Sierra
    0%
  89. 88Lompoc
    0%
  90. 88Solvang
    0%
  91. 91North Auburn
    0%
  92. 91Seasidelow-cost sensors
    0%
  93. 91Crescent City
    0%
  94. 94Grass Valley
    0%
  95. 94Rancho Murieta
    0%
  96. 94Watsonvillelow-cost sensors
    0%
  97. 94Redding
    0%
  98. 98Paradise
    0%
  99. 98Sunnyvalelow-cost sensors
    0%
  100. 100Big Bear City
    0%
  101. 100San Luis Obispo
    0%
  102. 102Atascadero
    0%
  103. 103Elk Grovelow-cost sensors
    0%
  104. 103Truckee
    0%
  105. 103Vacaville
    0%
  106. 106Yreka
    0%
  107. 107Florinlow-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

All cities in the world, June 2024 · All cities in United States, June 2024 · California now

Use this board

SmogRank, most polluted cities in California, United States, PM2.5, June 2024, smogrank.com/us/region/california/history/2024-06 (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.