Before revision: These chemicals have been used as coolants and lubricants in transformers and other electrical equipment due to their insulating properties.ATSDR A purely anthropogenic substance, PCBs are no longer in production in the United States due to the adverse health effects associated with exposure, but they are highly persistent and are still widespread in the environment.
After revision: :)These chemicals have been used as coolants and lubricants in transformers and other electrical equipment due to their insulating properties.ATSDR A purely anthropogenic substance, PCBs are no longer in production in the United States due to the adverse health effects associated with exposure, but they are highly persistent and are still widespread in the environment.