ABSTRACT
As illustrated by electrical domestic appliances, it is demonstrated that existing variable magnetic fields of the sources using industrial current can to a great extent be nonmonochromatic and possess rather a complex spectral composition. Under the above conditions the root-mean-square value of the magnetic field intensity used at present for meteorologic certification of the sources is unacceptable for hygienic assessment of the existing external magnetic fields. It is established that the root-mean-square value of the rate of the field induction variations representing the degree of body interaction with the electric field induced by the variable magnetic field is regarded as a more adequate and universal characteristic of low-frequency magnetic fields.