Dataset Information

The 2025 Los Angeles Wildfires and Outpatient Acute Health Care Utilization.

ABSTRACT:

Importance

January 2025 brought devastating wildfires to Los Angeles (LA) County, California, causing poor air quality, destroying homes and businesses, and displacing thousands of people.

Objective

To promptly determine if the January 2025 LA fires increased outpatient acute health care utilization.

Design, setting, and participants

This cohort study assessed electronic health care records of 3.7 million members of Kaiser Permanente Southern California (KPSC) who met enrollment criteria. Of those, 305 258 were highly exposed and 1.4 million were moderately exposed. KPSC serves 4.7 million people across 10 counties. Analyses were conducted January-June 2025.