How about PFAS from muzzles?
Inquiring minds want to know...
Researchers from Notre Dame, Oregon State University, North Carolina State University and Michigan State University used PIGE testing and other techniques to study a small sample of face masks — only nine in total, including four different types: surgical, single-use disposable masks, N95 masks and reusable cloth masks. One of the masks was specifically marketed to firefighters.
Five out of the nine masks contained some PFAS, but most levels were low enough that the results did not cause concern.
The highest amounts were detected in multi-layered masks made for firefighters. That could add to the risk of exposure firefighters face following studies that found significant amounts of PFAS in personal protective equipment. The chemicals are also known to shed off gear, materials and surfaces — and can be inhaled, ingested or absorbed into the skin.
https://news.nd.edu/news/researchers-test-drinking-water-face-masks-for-pfas/