Vehicle exhaust refers to the gases and particles released into the atmosphere from the combustion of fuel in vehicles, such as cars and trucks. This process occurs in the engine, where fuel is burned to produce energy for movement. The main components of vehicle exhaust include carbon dioxide, nitrogen oxides, carbon monoxide, and hydrocarbons. The release of vehicle exhaust can contribute to air pollution and has potential health effects on humans and the environment. To mitigate these impacts, many vehicles are equipped with catalytic converters, which help reduce harmful emissions, and regulations are in place to limit exhaust levels from vehicles.