Los Angeles wildfires exposed 7 million people to toxic lead pollution 80 times above normal levels, study finds
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A study published in Science Advances reveals that the January 2025 Los Angeles wildfires exposed approximately 7 million people to airborne lead concentrations over 80 times higher than typical background levels. The smoke from burning neighborhoods, including the Eaton Fire that destroyed over 9,000 homes and buildings in Altadena on January 7, 2025, also contained more than 50 times the lead, seven times the chlorine and bromine, and three times the arsenic of vegetation-fueled wildfires. Researchers noted that conventional air-quality monitoring systems struggle to identify these hazards while fires burn, and lead author Haroula Baliaka emphasized that people do not evacuate for smoke exposure.
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