Los Angeles Wildfires Linked to Significant Spike in Heart Attacks, Lung Illnesses
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A new study reveals a concerning surge in serious health problems among Los Angeles residents in the months following the January 2025 wildfires, highlighting the immediate and potentially long-lasting health consequences of increasingly frequent and intense wildfires. Researchers found a substantial increase in emergency room visits for heart attacks, pulmonary issues, and general illness within 90 days of the fires’ start.
Immediate Health Impacts Documented
The research, published in the Journal of the American College of Cardiology (JACC), focused on the health impacts of the Eaton and Pacific Palisades fires. According to a lead researcher, “Wildfires that spread into urban areas have proven to be extremely perilous because of how quickly they move and what they burn and release into the environment.” The study underscores the immediate threat these events pose to public health.
Investigators at Cedars-Sinai analyzed emergency department visits from January 7 to April 7,2025,comparing them to data from the same period between 2018 and 2024. While the overall number of emergency visits remained consistent, a striking pattern emerged: specific medical conditions saw a dramatic rise.
Compared to the average rates observed over the previous seven years, emergency visits for general illness increased by a staggering 118%. Visits related to heart attacks rose by 46%, and those for pulmonary illness increased by 24%. These figures point to a direct correlation between wildfire exposure and acute health events.
“Fine particles released by wildfires can enter the body and cause injury, notably to the heart and lungs,” explained a senior researcher at the Smidt Heart Institute at Cedars-Sinai. “Stress related to the fires may also contribute to a broad range of health issues.”
Novel Findings: Abnormal Blood Test Results
the study also revealed a previously unreported trend: a more than doubling of abnormal blood test results associated with general illness during the 90-day period in 2025. “abnormal blood test results could indicate that the body is responding to an external stressor such as toxins in the air,” stated a cardiologist involved in the research. This finding suggests wildfires may trigger systemic physiological responses beyond the immediate respiratory and cardiovascular systems.
A Long-Term Health Study Underway
this research is part of the broader LA Fire HEALTH Study, a collaborative, decade-long effort involving scientists from Cedars-Sinai, Harvard University, USC, Stanford, UCLA, UC Davis, UC Irvine, the Univ. of Austin, and yale University. The study aims to comprehensively understand the long-term health consequences of the January 2025 fires across Los Angeles County.
The research team hopes to identify effective mitigation strategies and protect vulnerable populations from the escalating health risks associated with wildfires. Further examination is crucial to determine the full extent of the damage and develop proactive measures to safeguard public health in the face of a changing climate.
Why: The study was conducted to understand the health consequences of the January 2025 wildfires in Los Angeles County.
Who: Researchers from Cedars-sinai, Harvard University, USC, Stanford, UCLA, UC Davis, UC Irvine, the Univ. of Austin, and Yale University are involved in the LA Fire HEALTH Study. The study focuses on the health of Los Angeles residents.
What: The study found a significant increase in emergency room visits for heart attacks (46%), pulmonary illness (24%), and general illness (118%)
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