What is the purpose of an exhaust emission system?

The purpose of an exhaust emission system is to reduce the amount of harmful pollutants released into the atmosphere from an internal combustion engine (ICE) vehicle or other combustion devices. This is achieved through a series of components that treat the exhaust gases before they are expelled into the environment. The system aims to minimize the release of:

* Carbon monoxide (CO): A highly toxic, odorless, and colorless gas.

* Hydrocarbons (HC): Unburnt fuel that contributes to smog formation.

* Nitrogen oxides (NOx): Gases that contribute to smog, acid rain, and respiratory problems.

* Particulate matter (PM): Soot and other small particles that can cause respiratory and cardiovascular issues.

In addition to reducing these harmful pollutants, some exhaust systems also aim to reduce noise pollution.