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Passenger Car Air Suspension refers to a type of automotive suspension system that utilizes air springs instead of traditional steel coil springs. This system provides a smoother and more comfortable ride by adjusting the air pressure in the springs to maintain a consistent vehicle height and level, regardless of the load carried or road conditions encountered. The use of air springs also allows for greater control over the suspension, enabling features such as automatic levelling and ride-height adjustment. This type of suspension is commonly found on luxury vehicles and some high-end performance cars.