We do not have scientific proof that electromagnetic radiation could be harmful. However we know that the higher the frequency, the more u201cenergeticu201d are the radio waves. Knowing that 5G will work at around 10GHz, 28GHz and 60GHz frequency bands (compare with Wifi at 2.4GHz, GSM at 900MHz and FM radio at 100MHz), if radio waves are proven to be harmful, 5G might be more dangerous. However the higher frequencies don't penetrate the human body easily, so they would'nt have that much effect.5G will use beamforming: the masts will focus the signal to the mobile phones and the mobile phones will focus their signal to the masts so the overall transmit powers will be kept very low.