Electromagnetic fields of various frequencies
and intensities exist in both the working and living
environment. The most common sources of those
fields, encountered practically everywhere,
are electrical equipment, radio and TV
communication devices, office equipment
and consumer products. In the working environment
electro-thermal and medical devices are also sources
of electromagnetic fields.
By affecting human, electromagnetic fields can cause health problems, initiate accidents, and interfere with the operation of electric and electronic equipment.