Poor ventilation practices expose humans to which of the following?

• A. Polycyclic Aromatic Hydrocarbons (PAHs)
• B. Microbial Pathogens
• C. Radon
• D. Volatile Organic Compounds (VOCs)

Answer: (D)

Poor ventilation dilutes and removes contaminants from indoor air, so when air exchange is limited, pollutants emitted indoors accumulate to higher levels. Volatile organic compounds are a large, common group of chemicals that readily evaporate from everyday sources—paints, solvents, cleaning products, furnishings, office equipment, and personal care items. Because these sources continually release VOCs, lack of ventilation lets concentrations rise, increasing exposure and the likelihood of adverse effects like irritation or headaches. While other contaminants can also be present under certain conditions—radon from soil gas can build up in tight buildings, microbes thrive with moisture, and PAHs may come from combustion—the link between poor ventilation and elevated VOC levels is direct and pervasive in typical indoor environments, making VOCs the most likely exposure concern in this scenario.