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Asthma Prevalence

Published by California Department of Public Health | State of California | Metadata Last Checked: December 28, 2025 | Last Modified: 2025-12-05T22:34:58.046968
This dataset contains the estimated percentage of Californians with asthma (asthma prevalence). Two types of asthma prevalence are included: 1) lifetime asthma prevalence describes the percentage of people who have ever been diagnosed with asthma by a health care provider, 2) current asthma prevalence describes the percentage of people who have ever been diagnosed with asthma by a health care provider AND report they still have asthma and/or had an asthma episode or attack within the past 12 months. The tables “Lifetime Asthma Prevalence by County” and “Current Asthma Prevalence by County” are derived from the California Health Interview Survey (CHIS) and include data stratified by county and age group (all ages, 0-17, 18+, 0-4, 5-17, 18-64, 65+) reported for 2-year periods. The table “Asthma Prevalence, Adults (18 and older)” is derived from the California Behavioral Risk Factor Surveillance System (BRFSS) and includes statewide data on adults reported by year.

Resources

9 resources available

  • BRFSS Data-Adult Asthma Prevalence 1995 to 2011

    CSV
  • CHIS Data-Lifetime Asthma Prevalence by County 2015-Present

    CSV
  • CHIS Data-Current Asthma Prevalence by County 2015-Present

    CSV
  • Data Dictionary - CHIS Data-Lifetime Asthma Prevalence by County 2015-Present

    CSV
  • Data Dictionary - CHIS Data-Current Asthma Prevalence by County 2015-Present

    CSV
  • Data Dictionary - BRFSS Data-Adult Asthma Prevalence 1995 to 2011

    CSV
  • BRFSS Data-Adult Asthma Prevalence 2012 to Present

    CSV
  • BRFSS Data-Asthma Prevalence Description

    PDF
  • All resource data

    ZIP

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