PVC has been repeatedly linked to many health concerns. So, you may ask yourself, why isn't it a subject of the supposedly comprehensive LEED certification criteria? That is the question that the LEED steering committee recently asked the US Green Building Council Technical and Scientific Advisory Committee (TSAC) to investigate further. And the results, while mixed, point to a definitive answer: PVC, when ranked throughout its life cycle, is consistently found as one of the worst materials for cancer related impacts. (more
http://www.inhabitat.com/2007/03/26/pvc-no-good/)