How does the EGR system contribute to reducing emissions?

The EGR (Exhaust Gas Recirculation) system plays a significant role in reducing emissions, particularly nitrogen oxides (NOx), which are pollutants formed during the combustion process at high temperatures. The primary function of the EGR system is to recirculate a portion of the exhaust gases back into the engine's intake air.

By doing this, the EGR system effectively lowers the combustion temperature within the engine cylinders. High combustion temperatures lead to the formation of NOx, and by reducing these temperatures through the introduction of exhaust gases, the EGR system minimizes the production of such harmful emissions.

This process not only helps in controlling NOx emissions but also contributes to overall engine efficiency. It’s an important aspect of modern engine design aimed at meeting stricter environmental regulations. The other options do not accurately represent the function of the EGR system in emissions control; for instance, reusing fuel does not occur through the EGR system, nor does it directly filter pollutants or increase combustion temperatures.