Dioxins and dioxin-like compounds

Dioxins and dioxin-like compounds (DLCs) are a group of chemical compounds that are persistent organic pollutants (POPs) in the environment. They are mostly by-products of burning or various industrial processes or, in the case of dioxin-like PCBs and PBBs, unwanted minor components of intentionally produced mixtures.

Source: Wikipedia — Dioxins and dioxin-like compounds (CC BY-SA 4.0)