When buying appliances for your home or office be sure to get a product that has a HEPA filter. If it is a vacuum cleaner you are buying the HEPA filter will help you feel better about the air you are breathing in. The filter retains about 99.5% of dust and other irritants. It can help reduce allergies or asthma. If it is an air filter you are purchasing a  can make a world of difference. With this filter an air purifier can catch 99.97% of airborne particles even as small as 0.3 microns. Which means smoke, pollen and smoke will be captured with this device.