1, radio and television transmitting equipment, the main system of radio broadcasting communications, radio and television broadcasting stations around the transmitter and relay stations and other departments.
2, communications radar and navigation transmitting equipment communications, including short-wave transmitters, microwave communication stations, terrestrial satellite communication stations, mobile communication stations.
3, industrial, scientific research, medical high-frequency equipment. This type of equipment to convert electrical energy into heat or other energy to be utilized, but accompanied by electromagnetic radiation generated and leaked out, causing environmental pollution in the workplace.
Industrial electromagnetic radiation equipment: mainly for high-frequency induction heating equipment, such as high-frequency quenching, high-frequency welding and high-frequency furnace, high-frequency melting equipment, etc., as well as high-frequency media heating equipment, such as plastic heaters, high-frequency drying and processing machines, high-frequency media heating coupling machine.
Medical electromagnetic radiation equipment: mainly for short-wave, ultra-short-wave physiotherapy equipment, such as high-frequency physiotherapy machine, ultra-short-wave physiotherapy machine, ultraviolet ray physiotherapy machine.
Scientific research electromagnetic radiation equipment: mainly for the electronic gas pedal and a variety of ultrasonic devices, electromagnetic cooker.
4, electromagnetic radiation interference in the transportation system, including: electrified railroads, light rail and electrified railways, rail trams, trackless trams, etc..
5, electromagnetic radiation in the power system, high-voltage transmission lines, including overhead transmission lines and underground cables, substations, including power plants and transformer power stations.
6, household appliances electromagnetic radiation, there are microwave heating and transmitting equipment, including computers, monitors, televisions, microwave ovens, wireless phones.
Man-made electromagnetic wave pollution includes:
1, pulse discharge. For example, the spark discharge generated when cutting off a high-current circuit, its transient current is very large, will produce a very strong electromagnetic. It is essentially the same as lightning, only the area of influence is smaller.
2, industrial frequency alternating electromagnetic field. For example, in the vicinity of high-power motors, transformers, and transmission lines and other electromagnetic fields, it does not radiate outward in the form of electromagnetic waves, but in the near-field area will produce serious electromagnetic interference.
3, radio frequency electromagnetic radiation. For example, radio broadcasting, television, microwave communications and other kinds of radio frequency equipment radiation, frequency range is wide, the impact of the region is also larger, can jeopardize the near-field area of the staff. Radiofrequency electromagnetic radiation has become the main factor in electromagnetic wave pollution of the environment.
Reference: Baidu Encyclopedia - Electromagnetic waves