PCP (pentachlorophenol) is classified as carcinogenic, mutagenic and toxic to reproduction. It was used for a long time in Wood preservatives (HSM) (also indoors). Since 1978, labelling has been mandatory and indoor use has been prohibited. PCP diffuses from treated wood (= primary source) for a long time and thus leads to contamination of the indoor air, through which it then accumulates on other organic materials such as house dust (= secondary source). PCP only degrades very slowly. In addition to the primary source, possible secondary sources must therefore always be considered during remediation.
