You live in sea of EMFs- and a regular combustion engine car's ignition produces EM values that are comparable. Plus the earth's EMF is stronger than what you will get from a car (sometimes 3x). Also the DC cables are paired to mitigate the field and the torque box and housing act as a faraday cage to reduce exposure to the field. -The EMF from a DC motor is not even enough of the types to qualify as a non ionizing thermal radiation danger (-Sunlight, radiowaves and microwaves which have the power to agitate the atoms and raise the temperature). UV light is where the danger starts to go past primarily thermal damage. However there is plenty of research that says magnetic fields in of itself do biological damage over time.
Ionizing Radiation is what you should be concerned with (if you want to worry at all) and you are getting bombarded with Alpha, Beta Gamma and Xray particles all day long from the Sun, Cosmic rays, the earth etc. Billions of Cosmic rays penetrate you body every second and can alter your DNA -alot of cancers and other diseases and ailments we might find one day are just caused by radiation from outer space
In fact Coffee cups (or any ceramic is going to be one of the highest sources in your house for radiation) -Even granite counter tops are debated as having too dangerous levels (from the Uranium slowly decaying into Radon then Lead throwing off radiation) -in fact most any alluvial sands/clays are high in radiation.
I have owned a Geigercounter and a gaussmeter (My father was in that field) since I was a kid and have probably tested everything possible out of curiosity. Dryers, Fridges, Juction Panels, and TVS have high EMFs but are not supposed to be placed in the highly occupied living spaces (bedroom, living room) except the TV which is why you are supposed to keep your distance (EMF dissapates at a square of the factor of distance change)
Anyways -I'm only a doctor on Sherdog -but the EMF danger from a car is not a concern.
Your cellphone is WAY WAY more dangerous.
