What is the importance of proper ventilation to indoor air quality in multifamily buildings?

• A. Reduces moisture and odors, but has no health impact.
• B. Only increases energy use.
• C. Proper ventilation reduces moisture, mold growth, odors; improves health; ensure balanced ventilation; maintain HVAC.
• D. Ventilation is not necessary in multifamily buildings.

Answer: (C)

Ventilation that is properly designed and maintained is essential for indoor air quality because it controls moisture, removes pollutants and odors, and supports occupants’ health. In multifamily buildings, moisture from kitchens and bathrooms can accumulate and lead to mold growth, which is linked to respiratory issues and allergies. Balanced ventilation—where air supply and exhaust are properly matched—helps keep interior pressures stable, prevents unwanted air from between units from carrying contaminants, and ensures consistent air exchange. Regular HVAC maintenance keeps filters clean and airflow adequate, so pollutants are captured and fresh air is delivered efficiently, without wasting energy. So the best choice captures all these benefits: reducing moisture and mold growth and odors, improving health, and emphasizing balanced ventilation along with ongoing HVAC maintenance.