Leaky air ducts can contribute to indoor air pollution by allowing outside contaminants, such as dust, pollen, and pollutants, to infiltrate the ductwork and circulate throughout the home. Air duct sealing involves identifying and sealing any gaps, cracks, or leaks in the duct system to prevent the ingress of outdoor air and improve HVAC efficiency. By creating a tighter seal, air duct sealing helps reduce energy waste, enhance indoor air quality, and promote better overall comfort.