Dioxins are produced as a byproduct of which of the following?

Dioxins arise mainly as unintended byproducts of high-temperature processes involving chlorine, notably burning plastics, chemical manufacturing and diesel combustion.

Incineration of plastics, especially chlorinated ones, releases dioxins when combustion is incomplete.

Chemical processing that makes chlorophenols and pesticides generates dioxins as trace contaminants.

Diesel fuel combustion in engines emits small amounts of dioxins into the air.

Forest fires and volcanic eruptions are treated here as natural events rather than the industrial byproduct sources meant.

Their extreme persistence and fat solubility let dioxins accumulate up food chains.