a group of chemically-related compounds that are persistent environmental pollutants (POPs), a family of organochlorine compounds. The most well-studied and most toxic member is 2,3,7,8-tetrachlorodibenzo-p-dioxin (2,3,7,8-TCDD) ..., mitmetsüklilised kloori sisaldavad äärmiselt mürgised ained; tekivad prügi põletamisel, metallurgias ning paberi ja tselluloosi tootmisel