How carbon monoxide is produce by motor vehicles?

Carbon monoxide (CO) is produced by motor vehicles primarily through the incomplete combustion of fuel in internal combustion engines. When fuel is burned, especially in conditions where there isn't enough oxygen, carbon monoxide is formed as a byproduct. Additionally, factors such as engine performance, fuel type, and maintenance can influence the amount of CO emitted. This toxic gas can accumulate in enclosed spaces and poses significant health risks to humans and animals.