Why does the car smell bad?

[Marvin]

In the case of a bad smell in the car, it is necessary to clean the evaporator and the air conditioning ducts. Almost all new cars contain several toxic substances such as formaldehyde, benzene, acetone, and xylene, which are the main toxic substances causing air pollution inside new cars. The leather seats, chemically treated decorative panels, and easily accessible engineering plastics, rubber, and synthetic fabrics in the car will emit unpleasant odors when the car is new or during extreme weather (after exposure to the sun), affecting people's health and safety. The sources of odors in the car usually come from three aspects. First, from the new car itself: cars are composed of many components, and if the harmful gases and odors in these components are not sufficiently released, they can pollute the cabin for a long time. Second, from the interior decorations: the harmful gases contained in the decorative materials, including benzene, formaldehyde, acetone, and xylene, can cause varying degrees of air pollution inside the car. Third, due to the use of air conditioning or poor cabin sealing, pollutants such as sulfur dioxide, carbon dioxide, and evaporated gasoline can enter the car and cause pollution.