The major primary sources of PCBs to the environment include vaporization of PCBs from unenclosed uses, inappropriate disposal practices, volatilization and runoff from landfills containing PCB waste, accidental release of PCBs from facilities where they are used, and incineration of wastes containing PCBs. Since the implementation of legislative and control measures, and the ending of PCB production, in most countries primary sources ofPCBs to the environment have declined, and secondary sources (e.g., the remobilization of PCBs from contaminated land and water bodies) have become increasingly important.
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