What are EMFs?

Electromagnetic fields (EMFs) are generated by electric charges and include the Earth's magnetic field, fields from the electricity supply, and radio waves from TV, radio, mobile phones, radar and satellite communications. The UK's electricity supply is at 50 Hertz (Hz) which means it changes direction, and back again, 50 times a second. The part of the electromagnetic spectrum from 0–300 Hz is known as Extremely Low Frequency (ELF).

Magnetic fields are measured in Teslas (T) and electric fields in Volts per metre (V/m). Magnetic fields and electric fields exist together.

The strength of EMFs fall rapidly the further you get from the source, and most common building materials screen out electric fields (but not magnetic fields).

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