New study raises questions about heavy metals in fire retardants

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New study raises questions about heavy metals in fire retardants
Heavy MetalsFireFire Retardant
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Jacob Margolis covers science for the LAist and KPCC newsroom.

A firefighting aircraft makes a retardant drop as crews work to contain a wildfire as it approaches homes during the Fairview Fire near Hemet, Calif. in Riverside County on September 7, 2022.If you're enjoying this article, you'll love our daily newsletter, The LA Report. Each weekday, catch up on the 5 most pressing stories to start your morning in 3 minutes or less.

Full disclosure: I'm thanked for my"helpful discussion" in the acknowledgements section of the paper. I reached out to McCurry in 2019, asking about whether we should worry about what's in fire retardant. McCurry, curious, pursued the research along with co-authors Marella Schammel and Samantha Gold.

Government agencies recognize the risk to waterways posed by the phosphates used in retardant products, and work to prevent drops near waterways, according to both the U.S. Forest Service and Cal Fire. To further our understanding of how retardants may contribute to contamination, more data on metal concentrations in waterways both prior to and after fires needs to be gathered.

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