Exposure to non-ionizing radiation in the aircraft cabin is primarily microwave and radio frequency radiation. In addition, magnetic fields on the flight deck are greater than 17 mG due to the proximity to avionic equipment and range from 3 to 8 mG in the aircraft cabin. The health impacts of these exposures are uncertain. Ultra-violet light exposure during layover has been considered to explain the increased risk in malignant melanoma noted among flight attendants, but it is suggested that this may not account for all of the risk.