PCB in caulk

Seems like PCBs, not a main trend environmental contaminant those days, is making news from time to time. Just last week, EPA released school guidance regarding possibility of presence of PCB in caulk. Something scientists have been working on and knowing for years now, apparently it was proven enough to be stated to the public- we still are exposed to PCBs, and not only by our diet, but also by the air the breath. And not all PCBs are coming from industrial areas, but they can be present in residential spaces because of something as innocent as the sealant.