Could you get carbon monoxide and poisoned if you are in a car behind another car that's on with a very bad exhaust fumes

In an enclosed place: Outdoors, it is unlikely to happen. In an enclosed place, such as a garage (or if you run your engine while fully encased in snow), it is more likely to happen. Outdoors, the air is flowing and the wind is blowing, so the concentration of carbon monoxide gets diluted before it reaches your nose. Remember, carbon monoxide has no odor. It has no odor at all. The exhaust odor is other chemicals.