Which of the following systems involves ensuring air quality?

The involvement of air quality is primarily associated with ventilation systems, which are designed to control and improve the quality of air within a building. They function by introducing fresh outdoor air, filtering contaminants, and exhausting stale indoor air, which helps to dilute indoor pollutants such as volatile organic compounds (VOCs), allergens, and carbon dioxide. Effective ventilation is crucial for maintaining a healthy indoor environment, as it directly impacts the air quality occupants breathe.

In contrast, heating systems focus on maintaining and regulating temperature rather than specifically addressing air quality. Security systems are geared towards protecting a building and its occupants from intrusions and other threats, and water systems are concerned with the distribution and quality of water supply, not air quality. Thus, ventilation systems stand out as the primary means of ensuring air quality in indoor settings.