LA fire smoke triggered surge in airborne toxins: How long did they stay?
A new study from UCLA provides insights into how the January 2025 Eaton fire affected air quality downwind, showing how levels of toxic airborne contaminants spiked and then dissipated as the burning died down. The research is published in the journal ACS ES&T Air.
A UCLA study published in ACS ES&T Air investigated the impact of the January 2025 Eaton fire on air quality downwind, revealing a surge in airborne toxins during the active burning phase. Toxic contaminants such as lead, arsenic, chlorine, bromine, and copper spiked in the smoke carried by the flames. However, the researchers found no evidence of these toxins lingering in the air after the fires were extinguished.
Pollution levels returned to normal within six days and remained stable for months. Suzanne Paulson, a professor and study author, emphasized the importance of understanding the immediate risks posed by smoke from wildland-urban interface fires to surrounding communities as these events become more frequent. While the study provided insights into the dynamics of smoke and dust travel, researchers noted the need to better understand how burning in urban environments versus wildlands affects the composition of pollutants in the smoke produced by these fires.
Catherine Banach, a Ph.D. student and co-author, highlighted that elements like lead, arsenic, zinc, bromine, and chlorine are typically higher in urban fire smoke, but these contaminants persisted even when the fires moved into wildland areas. Additionally, potassium, often used as a marker for burning vegetation, did not correlate with increased smoke levels but was linked to dust particles stirred up by the winds.
This emphasizes the complexity of these fires and the necessity of understanding local soil conditions to accurately interpret the sources of emissions.
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