Electromagnetic radiation has been around since the birth of the universe; light is its most familiar form. Electromagnetic fields (EMF) occur in nature and have always been present on earth. 

Electromagnetic fields (EMF) of all frequencies represent one of the most common and fastest growing environmental influences, about which anxiety and speculation are spreading. All populations are now exposed to varying degrees of EMF, and the levels will continue to increase as technology advances. 

During the 20th century, environmental exposure to man-made sources of EMF steadily increased due to electricity demand, ever-advancing wireless technologies and changes in work practices and social behaviour. Everyone is exposed to a complex mix of electric and magnetic fields at many different frequencies, at home and at work, and concern continues to grow over possible health effects from overexposure.

WHO established the International Electromagnetic Fields Project in 1996 to assess the scientific evidence of possible adverse health effects from electromagnetic fields and develop international standards to limit exposure. As part of the project, WHO conducts multi-disciplinary research and risk assessments of various EMF-emitting technologies.