EMFs stand for “Electromagnetic Fields.” People also use EMR (Electromagnetic Radiation) synonymously with EMF.
Electromagnetic radiation can also be divided into ionizing radiation and non-ionizing radiation.
Ionizing radiation is above what is referred to as extremely high-frequency radiation and of the kind that possesses enough energy to remove electrons from atoms or molecules, hence ionizing them. Ionizing radiation is often equated with the kinds of radiation emitted by x-rays, nuclear power plants, and nuclear bombs.
Non–ionizing radiation, on the other hand, refers to any kind of electromagnetic radiation that does not possess enough energy to ionize atoms or molecules — in other words, to totally remove an electron from an atom or molecule. This kind of radiation extends from what is described as extremely low frequency (ELF) to what is referred to as extremely high frequency (EHF).
Electromagnetic fields can further be divided into what has been described as “Power Frequency” and “Radiofrequency” (RF). Power frequency (which is also “Extremely Low Frequency” [ELF]) refers to the electricity coming in on your power lines and running on the wiring in your walls which powers your electrical appliances. Radiofrequency refers to frequencies involved in radio and TV broadcasting and those in the microwave bandwidth used in wireless transmissions for cell phones, WiFi, SmartMeters, and radar.
Furthermore, power-frequency electromagnetic fields are further divided into electric and magnetic fields which are measured separately at these lower frequency bandwidths, whereas they are coupled and measured together in the radiofrequency bandwidths.
And then there is what is described as “Dirty Electricity” which has to do with high-frequency transients running on the electric wires, which when running clean only possess a lower frequency (60 Hz in the USA) bandwidth. Dirty electricity has been shown in a number of experiments to cause and/or aggravate possible health effects like diabetes and Multiple Sclerosis.
Finally, there is Body Voltage, in which one’s body acts as an antenna to pick up voltage in the atmosphere. This can be measured either using a regular voltmeter.