Presently, air purifiers are in trend. Most people residing in urban areas choose to buy air filters to afford breathable air, free from pollutants, particulates, germs and allergens. It is wise to know in details about the air filters and the myths associated with them too. So, here are some really important points that one must consider before buying air filters from market. Go for a certified model: The first thing to keep in mind is getting a certified model.