Biological effects of low-level low-frequency electric and magnetic fields

The extent of penetration into tissue of extremely low frequency (ELF) and very low frequency (VLF) electric and magnetic fields is discussed. Experimental results on the biological effects of such fields of low amplitude are reviewed. The author concludes that while numerous effects have been reported, it is not possible at the present time to decide whether they constitute a health hazard. Information is insufficient for establishing firm exposure guidelines. Nevertheless, prudence would suggest, particularly on the basis of epidemiological evidence, that long-period human exposure above relatively low-field intensity levels should be avoided