Mercury Mercury has a long history as a potential poison to a pregnant woman. Reports of fish contaminated with mercury have been linked to cerebral palsy and microcephaly. PCBs are mixtures of several chemical compounds. Most fish, birds and humans now have measurable amounts of PCBs in their tissues. Pesticides Pesticides cover a large number of agents used to control unwanted plants and animals.
Human exposure is common because pesticides are used extensively.
Those of most concern contain several agents DDT, chlordane, heptachlor, lindane and others. There is a lack of clear information on the safety or lack of safety of many chemicals in our environment. The safest course of action is to avoid exposure when possible, whether by oral ingestion or through the air you breathe. It may not be possible to eliminate all contact. If you know you will be around various chemicals, wash your hands well before eating.