Mystery dioxin source: is it PCP?

Researchers have long been puzzled that inventories of dioxin sources do not tally with environmental levels. One study in 1997 found that dioxin levels in the UK atmosphere were twice as high as could be accounted for by known sources. US researchers may have solved the problem: they suggest that octachlorinated dibenzo-p-dioxin (OCDD) may be formed in the atmosphere from the wood preservative pentachlorophenol (PCP). 1

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