Which phrase provides the correct understanding of a cabin air filter?

The cabin air filter is specifically designed to improve the quality of air that enters the vehicle's interior, primarily by filtering out various contaminants such as dust, pollen, and other allergens. This function is critical for individuals who suffer from allergies or respiratory issues, as a clean air supply reduces the likelihood of inhaling harmful particles while driving.

The correct understanding emphasizes the cabin air filter's role in creating a healthier environment inside the vehicle. While it is true that a clean cabin air filter can indirectly contribute to a more comfortable driving experience, its primary purpose is related to air quality, hence the focus on eliminating allergens. Other options, such as improving cabin heating or enhancing driving visibility, do not accurately represent the specific function of the cabin air filter. These aspects may be indirectly affected by cabin air quality but are not the main objectives of the filter's design.