What are dioxins?
Pure dioxins are colorless solids or crystals. They are an unused byproduct of various combustion and manufacturing processes, and they can occur naturally as the result of forest fires or volcanic eruptions. Scientists have found dioxins in sediments in lakes and rivers, plant leaves, and other organic substances.
The peak period for dioxin production in the U.S. was during the 1960s and 1970s, when they were released by the pesticide, manufacturing, and municipal waste incineration industries. Since then, regulations have dramatically reduced dioxin levels. Sediment samples from around the world indicate an 80% decline in dioxin concentrations since 1970.
The majority of dioxin released into the environment results from:
- fossil fuel (coal, oil, natural gas, wood) combustion;
- chemical and paper manufacturing;
- automobile exhaust;
- cigarette smoke;
- soot from home fireplaces.
Opinions are divided about the human health risk related to dioxin. However, studies of possible dioxin health effects are ongoing.
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