As we take measurements, we will put the various exposure levels into context for you and explain how they relate to naturally occurring background levels, official exposure limits, and precautionary recommendations by concerned scientists and medical experts.

Power-frequency electric fields (ELF)

Sources: power/extension cords, wiring in walls, electrical appliances

Measurements: electric field strength in V/m at 60 Hz / 5 Hz to 2 kHz

Unplug all devices around the bed, including bedside lamps; otherwise, keep your distance from wiring and power cords, at minimum 3 to 6 feet.

Power-frequency magnetic fields (ELF)

Sources: overhead power lines, electrical panel, ground current

Measurements: magnetic flux density in nT or mG at 60 Hz / 5 Hz to 2 kHz

Always upgrade knob-and-tube wiring and avoid using heating blankets.

Radio-frequency radiation (RF)

Sources: wireless devices, cordless phones, Wi-Fi, cell antennas, radio, TV, radar

Measurements: power density in µW/m2 from 27 to 10,000 MHz

Prefer hardwired connections and use wireless devices more safely.

Intermediate frequency fields / dirty power (VLF)

Sources: fluorescent lamps, switch-mode power supplies, power inverters

Measurements: radiated and conducted emissions in V/m, nT, mV, > 2kHz

Avoid using (compact) fluorescent lighting.

Static electric fields

Sources: synthetic carpeting, synthetic bed sheets, synthetic clothing

Measurements: surface potential in V

Wear clothing made of naturally antistatic materials; walk barefoot where appropriate.

Static magnetic fields

Sources: box spring mattresses, headphones, steel reinforcement/trusses

Measurements: magnetic flux density in µT as a deviation from Earth’s magnetic field

Choose a nontoxic, metal-free mattress for undisturbed sleep.


Sources: natural background radiation of Earth’s crust, vintage watches

Measurements: gamma radiation in nSv/h, radon in Bq/m3

Ventilate regularly, which can reduce radon levels by up to 50%.


Sources: natural daylight and artificial lighting (incandescent, fluorescent, LED)

Measurements: illumination in lux

To boost melatonin levels, maximize light intake during the day and keep it dark at night.

Carbon dioxide

Sources: human exhaled air, burning of fuels like wood, gas, or oil

Measurements: carbon dioxide in ppm

Provide adequate air exchange to prevent carbon dioxide buildup indoors.