What system is placed on cars to prevent pollutants from being released into the atmosphere?

The emissions-control system is specifically designed to reduce and manage the release of harmful pollutants from the vehicle's engine into the atmosphere. This system includes various components such as catalytic converters, oxygen sensors, and EGR (Exhaust Gas Recirculation) valves, all of which work together to ensure that the exhaust gases produced during combustion are treated to minimize their environmental impact.

When the engine burns fuel, it produces harmful byproducts like carbon monoxide, nitrogen oxides, and hydrocarbons. The emissions-control system plays a crucial role by converting these substances into less harmful emissions before they are expelled through the exhaust pipe. By complying with environmental regulations and standards, this system helps in protecting air quality and reducing the overall carbon footprint of vehicles.

In contrast, the exhaust system focuses primarily on directing exhaust gases away from the engine and reducing noise. The fuel injection system manages the delivery of fuel to the engine for combustion, while the brake system is concerned with vehicle safety and stopping power, not emissions control. Thus, the emissions-control system is the appropriate choice, as its primary function relates directly to preventing pollutants from being released into the atmosphere.