1. The Couch
Many sofas, mattresses, and other cushioned furniture are treated with TDCIPP [Tris(1,3-dichloroisopropyl)phosphate], which is a flame retardant known to cause cancer. According to one study, it’s also one of ten chemicals most frequently found in household dust. You can consider replacing cushioned furniture you purchased prior to 2013, and check furniture labels on any purchases.