Indoor Air sciences CSMI Practice Exam

Which of the following is a primary method to reduce indoor air pollutants?

1. Using air fresheners

2. Increasing the number of indoor plants

3. Regular ventilation

4. Sealing all windows tightly

The correct answer is: Regular ventilation

Regular ventilation is a primary method to reduce indoor air pollutants because it involves the exchange of stale indoor air with fresh outdoor air. This process helps to dilute and remove contaminants such as volatile organic compounds (VOCs), particulate matter, and other harmful substances that may have accumulated inside a building. By allowing fresh air to flow into a space, ventilation can significantly lower the concentration of indoor pollutants, leading to improved air quality and a healthier environment for occupants. It can be accomplished through various means such as opening windows, using exhaust fans, or implementing a mechanical ventilation system. While using air fresheners may provide a temporary pleasant scent, it does not address the underlying pollutants and can sometimes introduce additional chemicals into the air. Increasing the number of indoor plants may help with some aspects of air quality; however, the extent of their effectiveness in removing pollutants is generally limited. Sealing all windows tightly can restrict airflow, potentially trapping indoor contaminants and worsening air quality instead of improving it. Thus, regular ventilation stands out as the most effective primary method in this context.