The Filtrete Smart Premium Allergen & Home Pollutants Air Filter attracts and captures microscopic particles like bacteria, particles that can carry viruses, and large particles like mold spores and pollen. Its Bluetooth-enabled sensor pairs with the Filtrete Smart App to help track filter life and determine optimal time for replacement based on your home's HVAC system's usage. According to the EPA, dirt and neglect are the top causes of heating & cooling system (HVAC) inefficiency and failure. To ensure efficient system operation, it's important to perform routine maintenance, including filter replacement.