In modern automobiles, the air must be cleaned before it gets sucked into the engine's air intake plenum and combustion chambers. If not, you run the risk of dust, dirt and debris quickly fouling up the engine, causing poor performance and potentially shortening the life of the car.In addition, modern engines rely on a precise ratio of air to fuel. When the engine is starved of air, the fuel mix is said to run too "rich," which in effect puts added strain on the engine.
The cabin air filter works to keep bad air out of the cabin when it comes in for the cooling process. The air molecules it can keep out include pollen, dirt from the road, pollutants from the air, road grime, dust, dirt, leaves and anything else flying around on the road. The air filter works just like a filter does on the furnace of the home or an air purifying system. Frequent changing of the filters is best and will keep everyone inside a little bit healthier. The cleaner the air, the better it is for those with allergies or even asthma and need to have clean air in order to feel good all of the time.