Skip Navigation LinksCaliforniaBreathingCountyAsthmaProfiles

Environmental health Investigations branch

Environmental Health Investigations Branch

California BreathingCBLogo.JPG

County Asthma Data Tool​​

The County Asthma Data Tool presents detailed asthma information by county. To use the tool below, please follow these steps:

  1. Select a tab to view data on Asthma Prevalence, Asthma Emergency Department (ED) Visits and Hospitalizations, or Asthma Deaths
  2. On the gray bar, select a County
  3. Also on the gray bar, make other selections such as Asthma Measure, Age Group, and Year

For details on data analysis methods, please see Technical Notes (PDF). For other questions or help understanding the data, contact us at

Additional Data Resources

Data on asthma hospitalizations and emergency department (ED) visits by county are also available through Tracking California's Asthma Data Query. Estimates for asthma ED visits by census tract can be accessed using CalEnviroScreen. Asthma prevalence data are available by county through AskCHIS and by zip code through AskCHIS Neighborhood Edition.

Page Last Updated :