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Wildfire Toxin Lingered for Miles
2 Jun
Summary
- Carcinogen hexavalent chromium spread nine miles from fires.
- 3 million people in Los Angeles County potentially exposed.
- Nanoparticles remained in air months after fires were out.
A recent University of California study has uncovered a concerning environmental health issue stemming from the 2025 Palisades and Eaton wildfires. Hexavalent chromium, a toxic carcinogen known to impact lung health and increase cancer risk, was found to have spread as far as nine miles downwind from the burn zones.
The study, published in "Nature Communications Earth & Environment," indicates that these nanoparticles could have reached more than 3 million residents across Los Angeles County. Researchers noted that these airborne particles, which are small enough to enter the bloodstream, persisted in the air months after the fires were put out.
While detected levels were below occupational limits, they exceeded EPA screening levels for indoor air. This discovery implicates wildfire cleanup zones as a source of these dangerous airborne metals. The toxic chromium-6 gradually reduced to a less harmful form over approximately eight months.
Experts advise residents near wildfire cleanup zones to use indoor air filters and limit outdoor exercise until air quality returns to normal. This situation highlights growing health risks associated with increasingly common wildland-urban fires.
