Illustration of electric and magnetic field. The electric field is present when the lamp is plugged in, due to the voltage difference between the connectors. The magnetic field is only present when the lamp is switched on, because  that's when current flows in the cable. Source: Hydro-Québec

All around the world, people are constantly exposed to electromagnetic waves.
 
Examples of man-made sources:

• cellular telephones
• radio-, and television transmissions
• WiFi networks
• satellite communications
• unintended emissions and stray fields arising from electronic circuits
• electric motors
• cables and power transmission networks   

Examples of natural sources:

• local build-up of electric charges in the atmosphere associated with thunderstorms
• light from the sun carries infrared and ultraviolet radiation
• ionizing radiation from the Earth and space
• the Earth's magnetic field

Electric and magnetic fields are also present in electromagnetic radiation. Electromagnetic radiation has a magnitude (size) and a frequency (time-dependent periodic variation). The frequencies of electromagnetic radiation ranges from static electric and magnetic fields, through radiofrequency and infrared radiation, to x-rays. The European power frequency is 50 Hz.