Attached some papers which might help you

Dear Dr. Shankhwar,

Farmers may be exposed to dioxins and furans contamination primarily in three ways: 1. if they practice activities that involve combustion of organic materials, various waste (especially plastics), at low temperatures (300-400 deg. C), but also by firing agricultural lands, meadows or forests; 2. if use phenoxy herbicides, because these products contain small amounts of dioxins and furans resulted as secondary products in the manufacturing process; 3. if agricultural soils were previously treated with phenoxy herbicides since these herbicides bioaccumulate in the soil for many years.

Respected C.A. (Kees) Kan Sir and Carmen Mateescu Ma'am,

I am thankful for your response and I further want to know as the formation of Dioxins is released during the combustion of chlorinated compound is the major contributor. Most of the country have already phase out the phenoxy herbicides than I want know whether this topic is still viable or not.

Regards, Dr Shankhwar

Hello Dr. Shankhwar,

As far as I know from some previous projects where I was involved (related to incineration of PCBs-contaminated materials and incineration of medical waste), the major contributor of dioxins formation is combustion of plastic materials in principal, but also of other organic materials, mainly chlorinated compounds or even not chlorinated but in presence of chlorine. These are anthropogenic factors which are added to natural factors such as volcano eruptions, forests fires etc. In my opinion, combustion is the major factor of dioxins and furans formation. Regards.