High frequent electromagnetic radiation
Of cell towers (also 5G), WiFi-routers, DECT telephones, microwaves, etc.
Of power lines, transformers, cars, etc.
Electric alternating fields
Of all electrical devices (computers, laptops, lamps, alarm clocks, etc.).
Caused by computers, laptops, plasma screens, digiboards, etc.
Scientific research shows that non thermal radiation of wireless devices negatively affects our health. In spite of that there is no consensus about this among scientists. That is the reason why exposure levels differ considerably between the different countries.