> On the other side there are levels for unwanted radio emissions, how do the cars pass them? How do cheap cell phone chargers pass them? Or is nobody looking a

> On the other side there are levels for unwanted radio emissions, how do the cars pass them? How do cheap cell phone chargers pass them? Or is nobody looking at this? Regulators do pay attention to automotive components. I'm sure some of the cheap chargers don't bother with FCC Certification Testing. The TL;DR is that unintentional and even intentional radiation must remain under certain field strength and/or power limits. That's why you're allowed to use those little aux-to-FM radio dongles to transmit on licensed spectrum, for example. A "useful lie" explanation of the rules goes something like: "If the interference generated by the car stays within a very small radius (say, the car itself, or less than a few meters around the car) then the FCC doesn't care."