Which measures were made to make the Arduino electromagnetically compatible?

Official Hardware Nano Family Nano 33 IoT
1

I'd like to know which measures were taken when designing the board in order to keep it from becoming unreliable in the face of electromagnetic radiation from outside and itself, and keep it from polluting its environment electromagnetically.

This is for schoolwork, and my teacher heavily encouraged asking in this way.

2

Have a look at the following page.

Please note. Arduino's are development boards/components and therefore the rules are slightly different then they are for other products like a toaster. Because you are changing the circuit and the software you are also responsible for ensuring compliance.