The pollutant gases entering the car through the ventilation system are very harmful and the effect they have on the human body is often lethal.The European Environmental Agency is talking about over 45000"premature deaths"that occur annually due to the particles in the atmosphere.A rigorous monitoring of pollutant content in the passenger compartment is absolutely necessary,therefore the appearance of the first pollen filter in 1940 by Nash Motors on the Weather Eye ventilation system.Studies conducted by researchers in Germany show that not all systems work the same way,and the degree of air fdtration is only 40% for some cars,while other cars filter outdoor air up to 90%.The most car manufacturers recommend the filters replacing,and huge gaps exist between a classic particle filter (it captures and retains dust,pollen and soot) and one with active carbon that also captures unpleasant odours.In reducing the amount of pollutant gases entering the passenger compartment,the air quality sensor (AUC),mounted in the pollen filter housing,also controls the activation of the recirculation function when the car enters a polluted area.Our paper presents an overview in the field of pollution in the passenger compartment,the main types of passenger car filters launched on the market and the importance of their use according to the manufacturer's indications.
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