I am a master's student at State University of New York College of Environmental Science and Forestry doing my thesis in Barriers in implementing material transparency in LEED v4 projects.

It would be great to get feedback and response for the following question from industry professionals who deal with this problem on a daily basis.

What are the challenges in determining the environmental qualities and human health impacts of building materials or products in LEED v4 projects? (Eg: Is it the lack of supply of healthy building materials from manufacturers, owner awareness or difficulty in accessing information like HPDs and EPDs from material databases or is it something else?)