Air cleaners remove contaminants in the air by capturing airborne particles of dust, smoke, pollen, etc. that people would otherwise breathe in. Smaller airborne particles like tobacco smoke and fine dust particles can enter the deeper part of the lungs, so the finer the filter, the more particles it traps. Air cleaners capture unpleasant smells and also bring relief to allergy and asthma sufferers by creating an allergen free and healthy environment. They help protect from the health hazards of polluted indoor air and provide overall improvement in air quality for long-term health.