http://en.wikipedia.org/wiki/Polychlorinated_dibenzodioxins#Sources_of_dioxins
Dioxins are produced in small concentrations when organic material is burned in the presence of chlorine, whether the chlorine is present as chloride ions or as organochlorine compounds, so they are widely produced in many contexts. According to the most recent US EPA data, the major sources of dioxins are broadly in the following types:[16]
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