What is the purpose on an exhaust emission system?

The purpose of an exhaust emission system is to reduce harmful pollutants produced by internal combustion engines before they are released into the atmosphere. This system captures and transforms toxic gases, such as carbon monoxide, nitrogen oxides, and unburned hydrocarbons, into less harmful substances through various components like catalytic converters and exhaust gas recirculation. By minimizing emissions, the system helps to comply with environmental regulations and improve air quality, contributing to public health and environmental protection.