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Extremely Low Frequency (ELF) fields:
- Electromagnetic Fields ranging in frequency from 3 Hz to 3 kHz.
- Produced by electrical power circuits: 60 Hz and higher harmonics.
- Significantly affected by 'dirty electricity'. Produced by electronic devices such as compact fluorescent light bulbs, dimmer switches, computers, ...
EMF Mapping Canada provides ELF measurements of magnetic fields.
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