How many AC filters are in a car?

The number of car air conditioning filters is usually one, but some high-end models are equipped with two to enhance air purification effectiveness. The filter is primarily installed inside the passenger-side glove compartment, responsible for filtering dust, pollen, harmful gases, and odors to ensure fresh air inside the vehicle. Common filter types include standard paper filters, activated carbon filters, and HEPA filters. Among them, standard paper filters have a lower cost but limited filtration efficiency; activated carbon filters can absorb odors and harmful gases; and HEPA filters achieve up to 99.97% filtration efficiency for PM0.3 particles. Different vehicle models select filter configurations based on their positioning to meet occupants' demands for a healthy and comfortable environment.