https://en.wikipedia.org/wiki/Dioxins_and_dioxin-like_compounds https://en.wikipedia.org/wiki/Dioxins_and_dioxin-like_compou... >PCDD/F-compounds were never sy

https://en.wikipedia.org/wiki/Dioxins_and_dioxin-like_compounds https://en.wikipedia.org/wiki/Dioxins_and_dioxin-like_compou... >PCDD/F-compounds were never synthesized for any purpose, except for small quantities for scientific research.[12] Small amounts of PCDD/Fs are formed whenever organics, oxygen and chlorine are available at suitable temperatures.[1] This is augmented by metal catalysts such as copper. The optimal temperature range is 400 °C (752 °F) to 700 °C (1,292 °F). This means that formation is highest when organic material is burned in less-than-optimal conditions such as open fires, building fires, domestic fireplaces, and poorly operated and/or designed solid waste incinerators.[3] Historically, municipal and medical waste incineration was the most important source of PCDD/Fs.