Indoor Air sciences CSMI Practice Exam

In assessing indoor air quality, which pollutant is commonly monitored?

1. Carbon dioxide

2. Hydrogen sulfide

3. Pesticide residues

4. Radon

The correct answer is: Carbon dioxide

Carbon dioxide is commonly monitored in assessments of indoor air quality because it serves as an important indicator of ventilation effectiveness and occupant activity levels. Higher concentrations of carbon dioxide can signify that an indoor space is not adequately ventilated, which can lead to a buildup of other harmful pollutants and negatively impact occupant comfort and health. In many indoor environments, particularly in spaces with high occupant density such as offices or classrooms, monitoring carbon dioxide levels allows for the evaluation of air exchange rates. If levels exceed certain thresholds, it may prompt corrective actions like increasing ventilation to ensure fresh air circulation and maintain a healthy indoor environment. While hydrogen sulfide, pesticide residues, and radon are significant pollutants in specific contexts, they are not typically monitored as indicators of overall indoor air quality in the same routine manner as carbon dioxide. For example, hydrogen sulfide is more commonly associated with specific industrial processes or sewage issues, pesticide residues are typically assessed during investigations of chemical exposure or agricultural practices, and radon tends to be a concern in specific geographical areas or older homes rather than a routine measure in various indoor settings.