SmogRank / World / United States / California / March 2024

Most polluted cities in California, United States, March 2024

96 cities in California, United States ranked by their average PM2.5 over the 31 days. Worst: Imperial Beach at 10.5 µg/m³, #330 of 1,643 cities in the world. Cleanest: Davis at 2.1. A city needs measurements on 70% of the days to be ranked.

OpenAQ's archive, where our readings come from, has almost none from the United States for March 20, 2024: cities in the United States have it from the EPA's own records of the same monitors. Why.

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.

← Imperial Beach 0% 0.75%0
Every city in California, United States ranked for March 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. 1Imperial Beach
    0%
  2. 2Los Angeles
    0%
  3. 2Ukiah
    0%
  4. 4Anaheim
    0%
  5. 5Compton
    0%
  6. 6Jurupa Valley
    0%
  7. 7Chula Vista
    0%
  8. 7Hawthornelow-cost sensors
    0%
  9. 7Santa Clarita
    0%
  10. 10Fontana
    0%
  11. 10San Diego
    0%
  12. 12Burbank
    0%
  13. 13Carsonlow-cost sensors
    0%
  14. 14Riverside
    0%
  15. 14Santa Cruz
    0%
  16. 16Inglewoodlow-cost sensors
    0%
  17. 16Stockton
    0%
  18. 18Torrancelow-cost sensors
    0%
  19. 18La Crescenta-Montroselow-cost sensors
    0%
  20. 20Santa Monicalow-cost sensors
    0%
  21. 20Rio Vista
    0%
  22. 22Fresno
    0%
  23. 23Indio
    0%
  24. 24Agouralow-cost sensors
    0%
  25. 25Hanford
    0%
  26. 26Banning
    0%
  27. 26Oceano
    0%
  28. 28El Cajon
    0%
  29. 28Lomitalow-cost sensors
    0%
  30. 28Victorville
    0%
  31. 31Calexico
    0%
  32. 31Simi Valley
    0%
  33. 33Glendora
    0%
  34. 33Oceanside
    0%
  35. 33Porterville
    0%
  36. 33Visalia
    0%
  37. 37Corcoran
    0%
  38. 37Turlock
    0%
  39. 39Poway
    0%
  40. 40Alta Sierra
    0%
  41. 40Big Bear City
    0%
  42. 40Long Beach
    0%
  43. 40Modesto
    0%
  44. 40Oakland
    0%
  45. 45Bakersfield
    0%
  46. 45Crestline
    0%
  47. 47San Francisco
    0%
  48. 48Brawley
    0%
  49. 49El Centro
    0%
  50. 49San Jose
    0%
  51. 49Thousand Oaks
    0%
  52. 52Carpinteria
    0%
  53. 52Hollister
    0%
  54. 54San Leandro
    0%
  55. 54Santa Barbara
    0%
  56. 56Alpine
    0%
  57. 56Lincoln
    0%
  58. 56Madera
    0%
  59. 56Arden-Arcade
    0%
  60. 60Huron
    0%
  61. 60Lake Elsinore
    0%
  62. 60North Auburn
    0%
  63. 63Merced
    0%
  64. 64Grass Valley
    0%
  65. 64Guadalupe
    0%
  66. 64Ojai
    0%
  67. 64Roseville
    0%
  68. 64Sacramento
    0%
  69. 64Yuba City
    0%
  70. 70Fillmore
    0%
  71. 70Salinas
    0%
  72. 72Clovis
    0%
  73. 73Paradise
    0%
  74. 73Yreka
    0%
  75. 75Ben Lomond
    0%
  76. 75Manteca
    0%
  77. 75San Luis Obispo
    0%
  78. 75San Rafael
    0%
  79. 79Orcutt
    0%
  80. 79Rancho Murieta
    0%
  81. 81Folsom
    0%
  82. 81Woodland
    0%
  83. 81Red Bluff
    0%
  84. 84Gridley
    0%
  85. 84Lancaster
    0%
  86. 86Colusa
    0%
  87. 87Galt
    0%
  88. 88Chico
    0%
  89. 88Lompoc
    0%
  90. 88Willows
    0%
  91. 91Atascadero
    0%
  92. 91King City
    0%
  93. 91Tracy
    0%
  94. 94Vacaville
    0%
  95. 95Solvang
    0%
  96. 96Davis
    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, March 2024 · All cities in United States, March 2024 · California now

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SmogRank, most polluted cities in California, United States, PM2.5, March 2024, smogrank.com/us/region/california/history/2024-03 (accessed 6 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.