Carpet pads made of foamed plastic or sheet rubber are high in Volatile Organic Compounds (VOCs) which could effect the air quality of the entire room. The impact of wall-coverings on interior air quality varies with the materials from which they are made. Vinyl wall-coverings emit vinyl chloride and other VOCs. This book gives details of which wall and flooring materials are best for maintaining a productive air environment in both residential and workplaces. (Binggeli, p 19, 220,234)
Binggeli, ASID, Corky. Materials for Interior Environments. New Jersey: John Wiley & Sons, Inc., 2008.