about just this. Firefighting foams are known to contain high levels of PFASs, so firefighters are exposed to higher than average levels of those chemicals. The landmark trial tested 285 Australian firefighters for PFAS in their blood over the course of one year. Some donated blood, some did not. PFAS chemicals bind to serum proteins in the blood, and researchers found that PFAS levels in the bloodstream of those donating were significantly reduced. One possible explanation is that the donors' bodies did indeed offload the PFAS-contaminated blood, and replaced it with unpolluted blood.

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