Indoor Air Quality (IAQ) refers to the condition of the air inside buildings and structures. It is influenced by various factors, including the presence of pollutants, humidity levels, and ventilation. Common indoor air pollutants include dust, mold, pet dander, and chemicals from household products. Good IAQ is essential for maintaining health and comfort. Improving IAQ can involve regular cleaning, using air purifiers, and ensuring proper ventilation. HVAC systems play a crucial role in maintaining air quality by filtering and circulating air. Monitoring carbon dioxide levels and humidity can also help create a healthier indoor environment.