Three major sources of car air pollution inside:

   1. Release of harmful substances contained in auto parts and interior decoration materials, including organic solvents, auxiliaries, additives and the like contained in plastics and rubber parts, fabrics, paint coatings, insulation materials, adhesives and the like used in automobiles Volatile ingredients. The main pollutants are benzene, toluene, formaldehyde, hydrocarbons, halogenated hydrocarbons, TVOC and so on. The material released from the interior of the car is the main source of unpleasant odors in the car.

   2. External environment pollutants into the car environment pollution. Pollutants are mainly hydrocarbons, carbon monoxide, sulfur dioxide, nitrogen oxides, particulate matter and so on.

   3. Vehicles emit their own pollutants into the vehicle environment, including pollutants discharged through the exhaust pipe, crankcase, fuel evaporation, etc., or dirt accumulated in the air duct after long-term use of automobile air conditioners. Pollutants are mainly hydrocarbons, carbon monoxide, nitrogen oxides, microorganisms, benzene, olefins, aromatic hydrocarbons and so on