What role does the air conditioner filter play in the car?

The air conditioner filter is like a human lung. When you turn on the external circulation of the air conditioner, the air conditioner filter can block tiny particles in the air that are invisible to the naked eye, such as dust, dust, and various unpleasant odors, etc., to ensure that the air entering the car is safe Clean. If the air conditioner filter element is dirty and the filter function disappears, these invisible bacteria and dust will be blown into the car through the air conditioner and sucked into the lungs.

We humans need to exchange gas with the outside world through the lungs, and the air conditioner, as a relatively closed space, relies on filters to exchange gas with the outside world.
The air conditioner can adjust the temperature in the car, dry the humidity, make the air in the car fully circulated, and isolate the pollutants in the air.
However, affected by the external environment, the ventilation pipes and filter elements of the car air conditioner will be polluted.
There will be residual moisture in the evaporator and air-conditioning pipelines, and various bacteria are prone to be produced in a dark and warm environment. By replacing the air-conditioning filter elements and cleaning the air-conditioning ducts, the growth of bacteria can be effectively reduced.
Since the air conditioning system can improve the air quality in the car, it can also play a role in isolating pollutants in the air when bad weather such as smog and sandstorms comes.