Where does EMI exist?

Electromagnetic interference (EMI) has become a part of our lives, should we deal with it? Many people believe that the widespread adoption of electronic solutions is a good thing, because it brings comfort and safety to our lives and brings medical services to us. However, these solutions also produce EMI signals with electronic hazards.
EMI signals come from a variety of sources. These sources include some of the electronic devices that are common around us. Cars, trucks, and heavy vehicles are themselves generators of EMI signals. The problem is that these EMI sources are located in the same location as the sensitive electronic circuits – inside the vehicle. This proximity affects audio devices, automatic door controllers, and other devices. This type of EMI noise present in vehicles is predictable.
But what about the phones that we use all the time in the 21st century? Every electronic device has its advantages and disadvantages. Today, the use of mobile phones allows us to easily connect with friends, family and business partners from anywhere. However, mobile phones also generate EMI signals, and that's just the beginning of the problem. Mobile phones have evolved beyond their basic phone functions to have more smartphone features. This EMI noise is completely unpredictable for interference with surrounding equipment and circuits. Mobile phones operate on high RF energy. Even if regulations are met, mobile phones can become an unintentional source of EMI that interferes with the operation of surrounding devices.
Printed circuit boards, clock circuits, oscillators, digital circuits, and processors can also become sources of EMI within the circuit. Some electromechanical devices that switch on and off current generate EMI during critical operation. These EMI signals do not necessarily negatively affect other electronic devices. The spectral composition and strength of an EMI signal determines whether it can have an unexpected effect on the circuit.