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Does the Earth's magnetic field affect human health?

The Earth's magnetic field does not directly affect human health. Humans evolved to live on this planet.

High altitude pilots and astronauts can experience higher levels of radiation during magnetic storms, but the hazard is due to the radiation, not the magnetic field itself. Geomagnetism can also impact the electrically based technology that we rely on, but it does not impact people themselves. 

Learn more: USGS Geomagnetism Program