County Asthma Data Tool
The County Asthma Data Tool presents detailed asthma information by county. To use the tool below, please follow these steps:
- Select a tab to view data on Asthma Prevalence, Asthma Emergency Department (ED) Visits and Hospitalizations, or Asthma Deaths
- On the gray bar, select a County
- 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 California.Breathing@cdph.ca.gov.