Part 3 of 4 Parts (Please read Parts 1 and 2 first)
Living at a high altitude exposes people to about twice as much charged particles and ultraviolet radiation as people living at sea level. If you are sensitive to ultraviolet radiation, you need to take more precautions if you live in such places as Denver, Colorado.
Part 2 of 4 Parts (Please read Part 1 first)
Airport scanners employ a specific band of the electromagnetic spectrum called the terahertz band. This band falls between infrared band and the microwave band. Terahertz radiation is almost complete blocked by human skin and is not thought to be very dangerous.