4-stage cleaning system filters 99.97% of all airborne pollutants as small as 0.3 microns, including pollen and other allergens, dust mites, mould spores, animal dander and cigarette smoke. AeraSafe – the built-in antimicrobial protection prevents the accumulation of odor causing bacteria, mold and fungi on the True HEPA Filter.nnAeraSmart Sensor permanently monitors the air quality and automatically adjusts the fan speed. Indicators in blue, yellow and red give an indication of the purity of the air. Aera+ mode increases airflow by up to 35% during the allergy season to remove allergens from the air Filter change indicator indicates when the carbon or True HEPA filter needs to be changed.