Question

What electromagnetic waves are dangerous for humans?

Answer 1

Our cell phones transmit in the radio/microwave part of the spectrum, and studies are being done to see if they have long term harmful effects. So while all forms of electromagnetic waves can be harmful, the ones usually though of as harmful are Gamma rays, X-rays, and Ultraviolet light.
(Too much sunlight can cause skin cancer and don't look straight at the sun)

Answer 2

Explanation: Except visible ranges waves, almost all the wave of EM spectrum are harmful for human health.Some waves in the electromagnetic spectrum are very harmful for humans and have very quick effect such as:- gamma rays, x-rays, ultraviolet rays etc. other wave such as radio and microwaves are also harmful for human being but they have long term effect.