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Urban Fires Unleash Toxic Metals on LA
29 Oct
Summary
- LA smoke study reveals millions exposed to elevated lead.
- Urban fire plumes differ chemically from wildfires.
- Study calls for reconsidering fire codes for urban blazes.
Millions of Los Angeles County residents experienced exposure to high concentrations of lead and toxic metals due to smoke from the Eaton Fire last year. A Caltech study revealed that during the fire's peak structural burning phase, approximately 7 million people in the LA metropolitan area faced lead levels 80 times above normal.
The smoke from this urban blaze possessed a distinct chemical nature compared to standard wildfires. Early stages of the fire, characterized by burning structures and vehicles, caused a dramatic spike in atmospheric toxic metals. This plume's composition shifted as the fire moved from urban zones into the Angeles National Forest.
Lead levels in eastern LA and the San Gabriel Valley surged on January 8 and 9, with the highest readings detected downwind of Altadena. Scientists noted that as the fire transitioned to a more typical wildfire in the mountains, lead concentrations decreased while potassium levels rose.
This research is among the first to analyze the air composition from urban fires. The findings suggest a need to reassess current fire codes and emergency response strategies, which may have previously underestimated the health impacts and mortality risks associated with urban firestorms in populated regions.
