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The pollen filter cleans and filters the air coming into the car and gets rid of allergens, which is essential for those who have allergies or suffer with respiratory difficulties. Having clean, filtered air in your car is also said to avoid problems such as headaches, fatigue and nausea.
The pollen filter can be located in various places, such as behind the glove box, under the dashboard, or under the bonnet.
The pollen filter catches pollen, dust, bacteria, exhaust fumes and stops any other particles, as well as leaves, dirt, twigs, insects and general road debris before they can enter the car's heating and ventilation and air conditioning systems.
The Car Care Council's advice is to change the air pollen filter every 12,000-15,000 miles. It is advisable, in any case, to check the pollen filter annually, to make sure it isn't clogged up and is still in good working order. How regularly you need to replace it will depend on factors such as how often you drive your car and the length of your car journeys, and climate, air quality and road conditions will play a big part in how hard the pollen filter is having to work.
A sign that the air pollen filter needs replacing is a bad smell in the car which can be caused by a blocked or dirty pollen filter. A clogged up pollen filter can cause the air in the car to be contaminated with fumes and debris and because you are in an enclosed space this contamination is concentrated. A blocked pollen filter can also inhibit air flow in the air conditioning and heating and ventilation system which could cause problems with the heating and cooling functions of these systems. It's worth ensuring you change the pollen filter before any problems like clogging, due to dirt build up, arise, particularly for the health benefits that having clean, filtered air provides. pollen filters should not be cleaned and then put back in, you should always replace the pollen filter with a new one.