Everyone should have a CO detector in their homes and it's already law in some countries. CO poisoning is very dangerous and can happen independent of cars. IF

Everyone should have a CO detector in their homes and it's already law in some countries. CO poisoning is very dangerous and can happen independent of cars. IF you have a smoke alarm at home there's no reason why you shouldn't have a CO detector as well (those probably make even more sense, CO can kill you even if you're awake, smoke detectors mostly help when you're sleeping).