Hundreds of additives and compounds are found in modern gasoline and diesel fuels sold at a regular service station. These additives cause the fuels to burn less cleanly, releasing gasses including nitrogen oxide, carbon monoxide, nitric oxide, and other volatile organic compounds like dimethyl and toluene. To deal with this, automobile manufacturers use various technologies such as SCR, EGR, and catalytic converters.

EGR is preparatory step carmakers use to reduce harmful pollutants before emissions from an engine are treated by catalytic processes or particle filters. At its most basic level, the EGR valve is one of the most important components of an EGR system. The EGR valve is located after the combustion chamber or engine cylinders. The valve will open to various ranges when the engine-regulated unit is activated, ECU. The EGR valve precisely regulates the amount of exhaust gasoline recirculated and blended with current consumption air through this. Many EGR systems include an EGR cooler to help reduce peak combustion temperatures even further ranges.

Diesel engines are known to emit large volumes of pollutants, and tighter emissions regulations mean that the standard three catalytic converters will not be able to remove them to acceptable levels.

Selective Catalytic Relief (SCR) is a more complicated emissions control system for diesel engines. The oxidation and discount reactions that formerly occurred inside a catalytic converter are split up into two different processes in a vehicle equipped with SCR.

The first is the oxidizing catalyst technique, which remains in place and performs the same processes to remove carbon monoxide and other compounds.

Selective Catalytic Relief system is employed as part of a distinct discount response system that targets nitrogen oxides exclusively, which is why it is named the same.

The SCR technique is made up of two main components. The first is a liquid lowering agent known as Diesel Exhaust Fluid injected as needed. A housing immediately connected to the vehicle's exhaust system provides an environment for any subsequent discount reactions to occur.

A catalytic converter is a tube-shaped structure with a chrome steel frame with an entrance for raw gasses and emissions from the engine and an exit for those gasses to pass through to the exhaust or particle filter. The key phrase that permits the catalyst to serve as, specifically, a ceramic honeycomb is included in the structure's metal frame. Most of the catalytic converters may also include oxygen sensors, which might also be known as lambda sensors linked to the vehicle's ECU. Catalytic converters don't always work well with leaded gas since lead can accumulate in the honeycomb and limit the converter's performance, but leaded gas is now phased out.

The application of these technologies has substantially aided in reducing potentially hazardous emissions to the environment. An increasing number of car manufacturers in developing such technologies.