UCLA study finds LA fire toxins vanished within six days
A new UCLA study published in ACS ES&T Air reports that airborne toxins from the January 2025 Eaton fire dissipated quickly downwind of Los Angeles.
Toxic levels spiked during burning
Researchers observed extremely high concentrations of lead, arsenic, chlorine, bromine and copper in the smoke while the fire was active. The study tracked how these specific contaminants moved through neighborhoods located downwind from the blaze.
Pollution returned to normal quickly
Data shows that air quality levels dropped back to baseline within six days after the flames were extinguished. No evidence suggests that heavy metals or toxic smoke remained suspended in the atmosphere for longer than this period.
Future research needed on urban fires
Professor Suzanne Paulson noted that more work is required to understand how burning in cities differs from wildland fires. She stated that understanding these dynamics helps communities prepare for risks posed by frequent wildland-urban interface events.
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