This document comprises a review of data on the effects of ELF fields, predominantly ELF electric fields at 50 and 60 Hz, on biological systems pertinent to the evaluation of health risks for man. The purpose of the document is to provide information for health authorities and regulatory agencies on the possible effects of ELF field exposure on human health, and to give guidance on the assessment of risks from occupational and general population exposure. The document includes a review of the data on the biological effects on human beings and animals of exposure to low frequency electric and magnetic fields in the frequency range of zero to 300 hertz (Hz) (ELF).