Indoor air quality (IAQ) plays a major role in overall health, comfort, and HVAC system performance. Poor IAQ is often caused by dust, mold, volatile organic compounds (VOCs), pet dander, and inadequate ventilation. In homes and buildings, these pollutants can build up over time, leading to allergies, respiratory irritation, headaches, and reduced productivity. Improving IAQ involves regular HVAC filter changes, proper ventilation, humidity control, and routine duct cleaning when needed. Advanced solutions like air purifiers, UV lights, and high-efficiency filtration systems can further reduce airborne contaminants. Maintaining balanced airflow and scheduling HVAC inspections helps ensure cleaner, healthier indoor environments year-round.