Which automotive system helps regulate emissions from the engine?

The emission control system is designed specifically to regulate and minimize the pollutants released from an engine into the atmosphere. This system includes various components, such as catalytic converters, oxygen sensors, and exhaust gas recirculation systems, which work together to reduce harmful emissions produced during fuel combustion. By controlling the engine's air-fuel mixture and optimizing the combustion process, the emission control system ensures that vehicles comply with environmental regulations and contribute to cleaner air.

In contrast, the braking system primarily focuses on the safety and control of the vehicle's movement, while the ignition system manages the process of starting the engine and ensuring it runs smoothly. The transmission system is responsible for transferring power from the engine to the wheels and does not have a role in emissions regulation. Thus, the emission control system is the most relevant choice for regulating emissions from the engine.