Air quality is one of those hidden things that impact health. Poor air quality can lead to problems breathing, cause allergies, trigger asthma attacks, and irritate your nose, throat, and eyes. Prolonged exposure to poor quality air can create long-term health problems and even impact the heart and cardiovascular system. When most of us think about air quality, we think about outdoor air. In a city like Houston, where we have refineries and plants, air quality can even help determine where we live. However, indoor air quality is as important as outdoor air quality for most of us. A well-functioning HVAC system should mean better indoor air quality than outdoor air. However, if you have dirty air ducts, you could be introducing contaminants and irritants into your home.