Indoor Air sciences CSMI Practice Exam

What indoor air quality concern is most linked to inadequate ventilation?

1. Excessive noise

2. Increased dust

3. High CO2 levels

4. Low humidity

The correct answer is: High CO2 levels

Inadequate ventilation is primarily linked to increased concentrations of indoor air pollutants, including carbon dioxide (CO2). When the ventilation system does not effectively exchange indoor air with outdoor air, CO2 emitted from sources such as human respiration, combustion appliances, and building materials can accumulate. Elevated CO2 levels are a significant indicator of poor indoor air quality, which can lead to discomfort, decreased cognitive function, and potential health effects. Excessive noise, increased dust, and low humidity, while they can be influenced by air flow and HVAC operation, are not directly caused by inadequate ventilation to the same extent as high CO2 levels. Noise is typically related to external sources or HVAC equipment itself rather than the air exchange process. Dust accumulation can be influenced by a variety of factors, including building cleaning practices and outdoor sources, not solely by the level of ventilation. Low humidity can result from various environmental factors and the operation of heating and cooling systems, not exclusively from poor ventilation. Understanding the relationship between ventilation and CO2 levels is important for maintaining good indoor air quality and ensuring a healthy indoor environment.