All electric appliances, and their networks, create an electromagnetic field. In developed countries, it is important to reduce the high levels of electromagnetic radiation.
The Earth has a natural electromagnetic field. However, artificial electromagnetic fields are harmful to human health and may cause vascular and other diseases. If several appliances are working at the same time in one room, it creates an electric smog.
Appliances with metal covers generate a weaker field than appliances with plastic covers. So how harmful do you think a hairdryer might be?
To protect your health: