Indoor Air Quality (IAQ) is paramount in building design, directly impacting occupant health, productivity, and a building's habitability. Modern, tighter construction, while energy efficient, exacerbates IAQ challenges by reducing fresh air infiltration. Architects must proactively implement a multi-faceted approach, focusing on eliminating pollution sources, meticulous moisture control, optimized ventilation systems, appropriate filtration (including HEPA), and selecting low-VOC materials and sustainable finishes to ensure a healthy indoor environment.