Mercury is a heavy, dense metal that is liquid at room temperature. It is used in a variety of electrical devices, such as thermometers, switches, medical equipment and light bulbs. A person may be exposed to mercury through skin contact, ingestion or inhalation of vapours.

Serious long term health effects may result from lengthy exposure to mercury without the necessary precautions. Unborn babies and infants are considered to be at an increased risk, if exposed to mercury. Health effects may include damage to the central nervous system, tremors, kidney damage or damage to the reporductive system.