Final answer:
The purpose of an exhaust emission system is to reduce harmful emissions produced by the combustion of fuel in an engine and protect air quality. It utilizes a catalytic converter to convert harmful gases into less harmful substances through chemical reactions.
Step-by-step explanation:
The purpose of an exhaust emission system is to reduce the amount of harmful emissions produced by the combustion of fuel in an engine. It helps to control and minimize the release of pollutants such as nitrogen oxides, carbon monoxide, and hydrocarbons into the atmosphere.
One key component of the exhaust emission system is the catalytic converter, which promotes the conversion of these harmful gases into less harmful substances through chemical reactions. For example, it converts nitrogen oxides into nitrogen and oxygen, and converts carbon monoxide and unburned hydrocarbons into carbon dioxide and water.
By reducing the emission of these pollutants, the exhaust emission system plays a crucial role in protecting air quality and minimizing the environmental impact of vehicles.